NZ727124B2 - Chitosan and polyethylene glycol copolymers and methods and devices for using same for sealing a vascular puncture - Google Patents
Chitosan and polyethylene glycol copolymers and methods and devices for using same for sealing a vascular puncture Download PDFInfo
- Publication number
- NZ727124B2 NZ727124B2 NZ727124A NZ72712415A NZ727124B2 NZ 727124 B2 NZ727124 B2 NZ 727124B2 NZ 727124 A NZ727124 A NZ 727124A NZ 72712415 A NZ72712415 A NZ 72712415A NZ 727124 B2 NZ727124 B2 NZ 727124B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- chitosan
- section
- peg
- sealant
- puncture
- Prior art date
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- 229940026752 topical Sulfonamides Drugs 0.000 description 1
- 229940083878 topical for treatment of hemorrhoids and anal fissures Corticosteroids Drugs 0.000 description 1
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- 229960005267 tositumomab Drugs 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- 229960002368 travoprost Drugs 0.000 description 1
- PAJMKGZZBBTTOY-ZFORQUDYSA-N treprostinil Chemical compound C1=CC=C(OCC(O)=O)C2=C1C[C@@H]1[C@@H](CC[C@@H](O)CCCCC)[C@H](O)C[C@@H]1C2 PAJMKGZZBBTTOY-ZFORQUDYSA-N 0.000 description 1
- 229960005294 triamcinolone Drugs 0.000 description 1
- DTQVDTLACAAQTR-UHFFFAOYSA-N trifluoroacetic acid Chemical class OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- 229960004791 tropicamide Drugs 0.000 description 1
- 229960005486 vaccines Drugs 0.000 description 1
- LNPDTQAFDNKSHK-UHFFFAOYSA-N valdecoxib Chemical compound CC=1ON=C(C=2C=CC=CC=2)C=1C1=CC=C(S(N)(=O)=O)C=C1 LNPDTQAFDNKSHK-UHFFFAOYSA-N 0.000 description 1
- 229960002004 valdecoxib Drugs 0.000 description 1
- 229960002149 valganciclovir Drugs 0.000 description 1
- 229960002381 vardenafil Drugs 0.000 description 1
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- 239000003071 vasodilator agent Substances 0.000 description 1
- 229960003726 vasopressin Drugs 0.000 description 1
- 229960001722 verapamil Drugs 0.000 description 1
- ZTHWFVSEMLMLKT-CAMOTBBTSA-N vidarabine monohydrate Chemical compound O.C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](CO)[C@@H](O)[C@@H]1O ZTHWFVSEMLMLKT-CAMOTBBTSA-N 0.000 description 1
- OGWKCGZFUXNPDA-XQKSVPLYSA-N vincristine Chemical compound C([N@]1C[C@@H](C[C@]2(C(=O)OC)C=3C(=CC4=C([C@]56[C@H]([C@@]([C@H](OC(C)=O)[C@]7(CC)C=CCN([C@H]67)CC5)(O)C(=O)OC)N4C=O)C=3)OC)C[C@@](C1)(O)CC)CC1=C2NC2=CC=CC=C12 OGWKCGZFUXNPDA-XQKSVPLYSA-N 0.000 description 1
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Classifications
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
- A61B2017/00623—Introducing or retrieving devices therefor
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00646—Type of implements
- A61B2017/0065—Type of implements the implement being an adhesive
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
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- A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
- A61L24/04—Surgical adhesives or cements; Adhesives for colostomy devices containing macromolecular materials
- A61L24/08—Polysaccharides
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- A—HUMAN NECESSITIES
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2400/00—Materials characterised by their function or physical properties
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- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
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- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
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Abstract
sealant is provided for sealing a puncture through tissue that comprises an elongate first section including a proximal end, a distal end, and a cross-section sized for delivery into a puncture through tissue, and a second section extending from the distal end of the first section. The first section may be formed from a freeze-dried hydrogel that expands when exposed to physiological fluid within a puncture. The first section comprises chitosan and at least one additional polymer. The second section may be formed from a solid mass of non-freeze-dried, non-cross -linked hydrogel precursors. The precursors are in an unreactive state until exposed to an aqueous physiological environment, whereupon the precursors undergo in-situ crosslinking with one another to provide an adhesive layer bonded to the first section. The second section may further comprise chitosan. Apparatus and methods for delivering the sealant into a puncture through tissue are also provided. on may be formed from a freeze-dried hydrogel that expands when exposed to physiological fluid within a puncture. The first section comprises chitosan and at least one additional polymer. The second section may be formed from a solid mass of non-freeze-dried, non-cross -linked hydrogel precursors. The precursors are in an unreactive state until exposed to an aqueous physiological environment, whereupon the precursors undergo in-situ crosslinking with one another to provide an adhesive layer bonded to the first section. The second section may further comprise chitosan. Apparatus and methods for delivering the sealant into a puncture through tissue are also provided.
Description
CHITOSAN AND POLYETHYLENE GLYCOL COPOLYMERS AND METHODS
AND DEVICES FOR USING SAME FOR SEALING A VASCULAR PUNCTURE
FIELD
l embodiments of the inventions disclosed herein relate generally to
sealants, apparatus, and methods for sealing punctures in a body. Some embodiments relate
to copolymers that provide enhanced sealing effects. In several embodiments, apparatus and
methods are disclosed that employ such copolymers for sealing a vascular puncture extending
through tissue to a blood .
OUND
Apparatus and methods are known for accessing a patient’s vasculature
percutaneously, e.g., to perform a procedure within the vasculature, and for sealing the
puncture that results after completing the procedure. For example, a hollow needle may be
inserted through a patient’s skin and overlying tissue into a blood vessel. A guide wire may
be passed through the needle lumen into the blood vessel, whereupon the needle may be
d. An ucer, procedural, or femoral sheath may then be advanced over the guide
wire into the vessel, e.g., in conjunction with or subsequent to one or more dilators. A
catheter or other device may be advanced through the ucer sheath and over the guide
wire into a position for performing a medical ure. Thus, the introducer sheath may
facilitate accessing and/or introducing various devices into the vessel, while minimizing
trauma to the vessel wall and/or minimizing blood loss.
Wounds such as arteriotomies can arise in the blood vessel from these
various medical procedures, especially for blood vessels acting as sites for catheter ion
during diagnostic and/or interventional catheterization. After such procedures have been
completed, the otomy that was created as an access point during the medical procedure
needs to be closed.
Upon completing the procedure, the device(s) and ucer sheath may
be removed, leaving a re extending between the skin and the vessel wall. To seal the
puncture, al pressure may be applied to the overlying tissue, e.g., manually and/or
using sandbags, until hemostasis occurs. This procedure, however, may be time consuming
and expensive, requiring as much as an hour of a medical professional’s time. It is also
uncomfortable for the patient, and may require the patient to remain immobilized in the
16704496_1 (GHMatters) 4.NZ 26/10/2020
operating room, catheter lab, or holding area. In addition, a risk of hematoma exists from
bleeding before hemostasis occurs.
Vascular closure devices can be used to achieve hemostasis (e.g., sealing)
of small holes that are formed in a blood vessel (either artery or vein) as the result of an
intravascular procedure (e.g., ation). Such procedures may be for diagnosis, drug
delivery, therapy (e.g., stent placement or angioplasty) and the like. The procedures involve
the formation of a small incision in the wall of a vessel to gain access to the intravascular
space. This incision, the vascular puncture or arteriotomy, must be closed at the completion
of the procedure. Rapid hemostasis at the vascular re is ideal, as it reduces patient
complications, improves time to t ambulation and time to al discharge.
For example, a mechanical based device can be utilized for vascular
closure. A percutaneous surgical device can se a combination wound suturing and
crimping and cutting device. The combined device may locate a vessel wound and pass
suture through the vessel walls surrounding the wound. Then, the ng and cutting
n may detach, the suturing portion may be removed, and the crimping and g
portion may be located to the wound site to apply a fastener (e.g., a ferrule).
Another mechanical based device can have two components: a needle
advancing apparatus slidable longitudinally along a catheter to advance needles into a tissue
membrane, such as a blood vessel wall, around an opening in the membrane; and, a suture
retrieval assembly able through the catheter beyond a distal side of the tissue
membrane. The needle advancing apparatus advances suture through the tissue wall. The
suture retrieval assembly grabs the suture on the distal side of the tissue membrane for
extraction thereof through the opening in the tissue membrane.
Such mechanical approaches tend to require precise positioning within the
tissue tract, typically provide point (instead of a continuum of tissue purchase) support, and
lead to permanent foreign-body implants that ere with subsequent catheterization at the
same vascular site. Additionally, a purely mechanical support of the wound could lead to
implanting substantially non-absorbable foreign material that provides only point-support to
the wound lips. In on, purely mechanical closures still can leave behind open microspaces
, or small gaps, between the sutures that are not entirely .
usly (and tly, in some cases), manual compression was the
main method for closing the vascular puncture. This could e extended periods of
manual pressure, clamping, exogenous weights, etc., applied directly to the site of the
16704496_1 (GHMatters) P104634.NZ 26/10/2020
vascular puncture. As hemostasis could take 20 to 60 minutes, patients often experienced
discomfort, and extended periods of bed rest were required.
In addition to, or in place of manual compression, vascular e devices
were developed to reduce the time to achieve hemostasis. Some such devices used sutures or
en plugs to seal the vascular re. However, many such devices result in an
intravascular component being retained within the , which can lead to future
complications.
More recently biodegradable materials have been employed to seal the
vascular puncture and, due to their dissolution over time, improve patient comfort and reduce
complications. Because rapid hemostasis can improve patient e and reduce medical
costs, further improvements in vascular sealants would be beneficial.
Though presently in use, many current sealant technologies facilitate
hemostasis of a wound puncture by physically clogging the tissue tract. This physical
occlusion replaces manual compression, but certain of such ric sealants have a
relatively weak polymer network integrity, which can increase time to hemostasis.
Various biological approaches to vascular closure have been used such as
a device and method that includes inserting a vessel plug or sealant into the incision or
puncture until the distal end of the vessel plug is adjacent to the outer lumen of the blood
vessel. The vessel plug is positioned so that it does not obstruct the flow of fluid through the
blood vessel or target organ. The precise positioning of the vessel plug in the incision or
puncture is accomplished through the use of a balloon catheter or a cylindrical insertion
assembly having a al plunger member associated therewith. Another biological
closure can deploy a collagen plug to seal the e. In order to block the collagen from
entering the vessel, a footplate is installed on the interior of the blood vessel. The footplate is
held in place with a suture.
In one ce, a vascular closure device can include two synthetic
polyethylene glycol (“PEG”) polymer powders that are mixed with appropriate buffers and
ed through a femoral sheath at an arteriotomy site, e.g., as disclosed in U.S. Patent No.
7,316,704. Accordingly, apparatus and methods for g a puncture through tissue would
be useful. In particular, ing the efficacy (e.g., speed ficiency) of g a
puncture would be useful.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
In a first aspect, the present invention provides an tus for g a
puncture through tissue, comprising: a sealant having a first section formed from a freezedried
hydrogel, n the first section expands when exposed to physiological fluid within
a puncture; and wherein the first section of the sealant comprises a hydrogel comprising
chitosan bound to at least one polyethylene glycol polymer, wherein, upon exposure to an
aqueous physiological fluid, the hydrogel expands and seals the puncture through the tissue;
and a sheath having a lumen, wherein the sealant is positioned in the lumen of the sheath;
wherein the apparatus is sized at 2.33 mm or smaller.
Also disclosed is an apparatus for sealing a vascular puncture having a size
of 2 mm or larger the tus comprising: a small bore device having a diameter smaller
than a diameter of the puncture, the small bore device having a sheath with a lumen, wherein
a sealant is positioned in the lumen of the sheath; the sealant comprising a first section
including a proximal end, a distal end, and a cross-section sized for delivery into the puncture
through tissue, the first section formed from a freeze-dried polyethylene glycol (PEG) and
chitosan hydrogel that s when exposed to physiological fluid within the puncture, and
a second section extending from the distal end of the first n, the second section
comprising osslinked PEG precursors, at least some of the PEG precursors in an
unreactive state; wherein, upon exposure to the physiological fluid, the PEG and hydrogel
expands and seals the puncture through the tissue.
Also disclosed is an apparatus for sealing a puncture through tissue,
comprising: a sealant having a first section having a al end, a distal end, and a first
cross-section, the first section formed from a -dried hydrogel comprising chitosan
bound to at least one polyethylene glycol polymer, wherein the hydrogel expands when
exposed to physiological fluid within a puncture; and a second section having a second crosssection
, the second section extending from the distal end of the first section, and the second
section comprising non-cross-linked polyethylene glycol sors and no chitosan; and a
sheath having a lumen, wherein the sealant is positioned in the lumen of the sheath; wherein
the tus has a diameter smaller than a diameter of the puncture.
In a second aspect, the present ion provides a method of making a
sealant for sealing a re through tissue, the method comprising: forming an te
first section including a proximal end, a distal end, and a section sized for delivery into
a re through tissue, the first section formed from a freeze-dried hydrogel comprising
16704496_1 (GHMatters) P104634.NZ 26/10/2020
hylene glycol and chitosan, the hydrogel capable of expanding when exposed to a
physiological fluid within the puncture; and applying a second section to the distal end of the
first section, the second section comprising a ity of non-crosslinked polyethylene glycol
precursors, the precursors remaining in an unreactive state until exposed to the physiological
fluid within the puncture, whereupon the precursors undergo in-situ crosslinking with one
another and to bond to the second section.
Provided for herein, in several embodiments, are vascular sealants,
apparatus, and methods for sealing vascular res, the ar sealants comprising
copolymers that provide enhanced g effects.
As such, several embodiments herein provide vascular sealants comprising
copolymers that provide enhanced hemostasis. In some embodiments, this is due to
supplementation of the physical occlusion of the vascular puncture by sealants that have
hemostatic and/or procoagulative properties. In several embodiments, the sealants attract
platelets and/or other coagulation promoting co-factors. In several embodiments, the
copolymer sealants provide enhanced “grip” at the site of a vascular puncture, thereby
improving the occlusion of the puncture, and even allow the use of the copolymer sealants on
larger puncture sizes.
In several embodiments, the copolymer sealant comprises chitosan and one
or more hylene glycol polymers that exhibits a more rapid hemostasis compared to
sealants that se only chitosan or only polyethylene glycol r sealants. Chitosan
is a natural biopolymer found in crustaceans with a wide range of ations in tissue
engineering, tissue repair and wound healing. Chitosan can be produced by deacetylation of
chitin, which is the structural element in the exoskeleton of ceans (e.g., crabs, shrimps,
etc.). Variation in the degree of deacetylation (%DA) can result in varying onality of
the chitosan in different applications. an is also biodegradable, for example, by
chitosanase, papain, ose, acid proteases, and the like. Chitosan can form hydrogels
depending on the molecular , the degree of deacetylation and the pH. In addition, a
variety of cross linkers can be utilized to crosslink chitosan polymer chains and result in the
formation of hydrogels.
Chitosan has been known to have atic properties, which are
described, for example in US Patent No. 4,394,373 and US Patent No. 8,012,167. However,
in several embodiments, the chitosan of the copolymer sealants disclosed herein, is not
simply mixed with the other polymeric component (or components), but rather is bound (e.g.,
16704496_1 (GHMatters) P104634.NZ 26/10/2020
covalently or non-covalently) to the other component (or components) of the sealant. For
example, in several embodiments, the copolymer sealant comprises an covalently (or
non-covalently) bound to two types of hylene glycol (PEG), PEG-amine and PEG-
ester. Advantageously, this improves the structural integrity of the sealant when deployed,
but also imparts agulant and hemostatic properties to the sealant that improve efficacy
in sealing vascular res.
Several embodiments of the sealants disclosed herein comprise both
polyethylene glycol and chitosan in the freeze dried polymer hydrogel (e.g., the sealant).
Sealants sing only PEG (with no chitosan incorporated) elicit hemostasis of a wound
puncture essentially by clogging the tissue tract upon expansion of the hydrogel sealant in the
presence of physiological fluids. Freeze dried hydrogel sealant containing only PEG would
lack the hemostatic and agulative properties of chitosan that is included in the sealants
disclosed herein and thus PEG-only sealants would result in slower and less efficient
hemostasis.
On the other hand a freeze dried hydrogel sealant utilizing chitosan only
(with no PEG components incorporated) would lack the porosity characteristics (size and
number of pores) that partially cross-linked PEG hydrogels can create upon freeze drying.
Such a el would lack the rapid ng capability that PEG ents impart.
These hydrogels would have reduced capacity to absorb logical fluids and swell and
subsequently clog the tissue tract. In addition these els would have reduced ty to
rapidly absorb blood and ctly boost the inherit capability of chitosan since less blood
would be available for chitosan to promote clotting. This would result in a reduced capacity
to promote hemostasis as compared to hydrogels that contain both polyethylene glycol and
chitosan, such as those disclosed herein.
Thus, freeze dried hydrogels comprising both chitosan and polyethylene
glycol advantageously, and unexpectedly, lead to faster hemostasis of wounds since they
combine the swelling characteristics of the PEG moiety along with the hemostatic and procoagulative
properties of chitosan. The absorbance of blood by the porous PEG components
can supplement and enhance chitosans ability for ng because more blood volume is
available for chitosan per surface area. These chitosan-PEG hydrogels may therefore have
application to larger wounds versus the limited ability when the sealant is composed of
only polyethylene glycol or only chitosan.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
Therefore, there are ed, in several embodiments, sealants for sealing
punctures in tissues. In one embodiment, there is provided a sealant for sealing a puncture
through tissue, comprising an elongate first section having a proximal end, a distal end, and a
cross-section sized for delivery into a puncture through tissue and a second section extending
from the distal end of the first n, the first section comprising a hydrogel sing
chitosan bound to at least one polymer. In l embodiments, the first section is formed
from a freeze-dried hydrogel and the first section is ured to expand when exposed to
physiological fluid within a puncture. In several embodiments, upon re to an aqueous
physiological fluid, the hydrogel expands and seals the puncture h the tissue. In
several embodiments, the re is a vascular puncture.
Also provided, in several ments, is a sealant for sealing a re
through tissue, comprising a first section formed from a freeze-dried hydrogel, the first
section being configured to expand when exposed to physiological fluid within a puncture.
In several embodiments, the first section comprises a hydrogel comprising chitosan bound to
at least one polymer, and upon exposure to an aqueous physiological fluid, the el
expands and seals the puncture through the tissue.
In several embodiments, the first section has an elongated shape with a
proximal end, a distal end, and a cross-section sized for delivery into a puncture through
tissue. In l embodiments, the chitosan comprises chitosan that is at least partially
deacetylated. For example, in one embodiment, the chitosan has a degree of deacetylation of
at least 60%. In additional embodiments, the degree of deacetylation is between about 40%
to 50%, about 50% to about 60% about 60% to about 70% about 70% to about 80%, about
80% to about 90%, about 90% to about 95%, about 95% to about 99% (and overlapping
ranges between those listed). Greater or lesser degrees of deacetylation are also used, in
other embodiments.
In several embodiments, the chitosan has a molecular weight between
about 10 kilodaltons and about 600 kilodaltons, including about 10 kilodaltons to about 50
kilodaltons, about 50 kilodaltons to about 100 kilodaltons, about 100 kilodaltons to about 200
kilodaltons, about 200 kilodaltons to about 300 kilodaltons, about 300 kilodaltons to about
400 ltons, about 400 kilodaltons to about 500 kilodaltons, about 500 kilodaltons to
about 600 kilodaltons, or any molecular weight n or including those values.
Depending on the embodiment, the chitosan can be of a varied type. For
example, in several embodiments, the chitosan can be free chitosan, chitosan chloride,
16704496_1 (GHMatters) P104634.NZ 26/10/2020
chitosan glutamate, chitosan acetate, chitosan dicarboxylic acid salts, chitosan adipate,
chitosan succinate, or chitosan fumarate. In some embodiments, combinations of two or
more forms of chitosan are used.
In several embodiments, the at least one polymer is a polyethylene glycol
polymer chain. In some embodiments, the at least one polymer is a polyethylene glycol
polymer chain with side group functionality. In several embodiments, the at least one
polymer is an amine modified polyethylene glycol or an ester ed polyethylene glycol.
Combinations of amine ed hylene glycols and ester modified polyethylene
glycols can also be used, in several ments. In several embodiments, the an is
bound to the at least one polymer by a nt bond. In additional embodiments, the
chitosan is bound to the at least one polymer by a non-covalent bond. In one ment,
the at least one polymer is linked polyethylene glycol that is bound to the chitosan.
In several embodiments, the amount of chitosan is varied. For example, in
several embodiments, the first section of the t comprises between about 0.1% and about
% (by weight) an. For example, in several embodiments the chitosan is present in an
amount (by weight) between about 0.1% to about 1.0%, about 1.0% to about 5.0%, about
.0% to about 10.0%, about 10.0% to about 15.0%, about 15.0% to about 20.0%, about
.0% to about 25.0%, about 25.0% to about 30.0%, and any amount between or including
those amounts. In one embodiment the first section comprises between about 0.5% and about
8% (by weight) chitosan. In one embodiment, the first section comprises between about 2%
and about 4% (by weight) chitosan. In one embodiment, the first section comprises between
about 4% and about 6% (by weight) chitosan. Greater or lesser amounts of an are also
used, in some embodiments.
In several ments, the at least one polymer comprises polyethylene
glycol-amine (PEG-amine) and polyethylene glycol-ester ster). In some
embodiments, the PEG-amine and PEG-ester are present in a molar ratio of PEG-amine to
PEG-ester between 4 to 1 and 1 to 4. In some embodiments, the PEG-amine and PEG-ester
are present in a molar ratio of PEG-amine to PEG-ester between 2 to 1 and 1 to 2. In some
embodiments, the PEG-amine and PEG-ester are present in a molar ratio of PEG-amine to
PEG-ester between about 0.8 to about 1.2. In some embodiments, the ine and PEG-
ester are present in a molar ratio of PEG-amine to PEG-ester between about 0.9 to about 1.
In several embodiments, the PEG-amine and PEG-ester are present in a
ratio of equivalent active groups that ranges from about 0.1 to about 5. In some embodiments,
16704496_1 (GHMatters) P104634.NZ 26/10/2020
the PEG-amine and ter are present in a ratio of equivalent active groups that ranges
from about 0.5 to about 3. In some embodiments, the PEG-amine and PEG-ester are present
in a ratio of equivalent active group sites that ranges from between about 0.5 to about 2.0. In
some embodiments, the PEG-amine and PEG-ester are present in a ratio of equivalent active
group sites that ranges from about 0.8 to about 1.2. In some embodiments, the PEG-amine
and PEG-ester are present in a ratio of equivalent active group sites that ranges from about
0.9 to about 1.
In l embodiments, the at least one polymer comprises polyethylene
glycol-ester (PEG-ester). In one embodiment, the PEG-ester can be present in an amount (by
weight) between about 99.0% to about 1.0%, about 90.0% to about 10.0%, about 80.0% to
about 20.0%, about 70.0% to about 30.0%, about 60.0% to about 40.0%, about 55.0% to
about 45.0%, about 53.0% to about 47.0%, about 52.0% to about 48.0%, about 52.0% to
about 50.0%, and any amount between or including those amounts.
In several embodiments, the at least one polymer ses polyethylene
glycol-amine mine) and a mixture of polyethylene glycol-esters (PEG-esters). In
some embodiments, the PEG-amine and PEG-ester mixture can be present in a molar ratio of
PEG-amine to PEG-ester of between 4 to 1 and 1 to 4. In some ments, the PEG-
amine and PEG-ester mixture can be present in a molar ratio of PEG-amine to PEG-ester
n 2 to 1 and 1 to 2. In some embodiments, the PEG-amine and PEG-ester can be
present in a molar ratio of PEG-amine to PEG-ester between about 0.8 to about 1.2. In some
embodiments, the PEG-amine and ter can be present in a molar ratio of PEG-amine to
PEG-ester between about 0.9 to about 1.
In several embodiments, the sealant can also include a second section. In
some embodiments, the second section can extend from the distal end of the first section. In
some such embodiments, the second section can be made up of non-cross-linked precursors.
In some ments, the non-cross-linked precursors comprise polyethylene glycol-amine
and/or polyethylene glycol-ester. Depending on the ments, the second section also
optionally includes chitosan. For example, in one embodiment, the second section can be a
mixture of non-cross-linked polyethylene glycols bound to the an. In several
ments, the second section (when chitosan is ed) can include between about
0.1% and about 30% (by weight) chitosan. For example, the second section may, in some
embodiments, include between about 0.1% and about 30% (by weight) chitosan, including
about 0.1% to about 1%, about 1.0% to about 5.0%, about 5% to about 10.0%, about 10.0%
16704496_1 (GHMatters) P104634.NZ 26/10/2020
to about 15.0%, about 15.0% to about 20.0%, about 20.0% to about 25.0%, about 25.0% to
about 30.0%, and any amount between or including those s.
Also, in several ments, the second section may also include one or
more reinforcement elements. In some embodiments, the reinforcement elements have
hemostatic properties including but not limited to chitosan reinforcing fibers, chitosan mesh,
chitosan particles, or combinations thereof.
In several embodiments, the chitosan mesh is configured as a helical coil
within the second section. In several embodiments, the chitosan mesh (regardless of its
conformation) includes cross-linked chitosan, wherein the cross-links were formed using
genipin. In several embodiments, chitosan fibers are configured as a helical coil within the
second n. In some such embodiments, the an fibers are formed by
electrospinning. In several embodiments, the chitosan can be in the form of particles that are
incorporated into the second section. The an particles can be orated, depending
on the embodiment, in a random manner throughout the second section, in a substantially
uniform manner throughout the second section, or a patterned manner throughout the second
section. In additional ments, random, uniform, or patterned particle distribution can
be used in different portions of the second n.
In several embodiments, the sealant can be configured to seal a vascular
puncture, wherein the sealant expands after exposure to an aqueous physiological fluid, and
wherein a second section of the sealant can have hemostatic and pro-coagulative properties.
In several embodiments, the second section further comprises a pH adjusting agent. In several
embodiments, the sealant further comprises a therapeutic agent. In several embodiments, the
sealant is dimensioned with a first section having a length (e.g., n proximal and distal
ends) of between about 1 and about 20 millimeters. In several embodiments including a
second section, the second section has a length of between about 0.5 and about 5 millimeters.
In several ments having both first and second ns, the first and
second sections can have a substantially uniform outer section along their lengths
between about 1 and about 8 millimeters. Upon exposure to an aqueous physiological fluid,
the sealants are ured to expand. In some embodiments, the first section (and second
section, if included) is configured to expand in the ion of the outer cross section of the
sealant of at least 15%, including at least 20%, at least 25%, at least 30%, at least 40%, or at
least 50%.
16704496_1 (GHMatters) 4.NZ 26/10/2020
There are also provided herein methods for sealing a vascular puncture
sing applying a sealant as bed herein to the ar puncture.
In several embodiments, therefore, there are provided sealants and
associated methods for sealing a puncture in a body. More particularly, several embodiments
are directed to sealants made from chitosan and hylene glycol for sealing a puncture
through tissue, and to methods for making such sealants. In addition, several embodiments of
the invention are directed to sealants and methods for providing temporary or permanent
hemostasis within a puncture extending through tissue.
In accordance with one embodiment, a sealant is provided for sealing a
puncture through tissue that includes a first section including a proximal end, a distal end,
and a cross-section sized for delivery into a puncture through tissue, and a second section
fused to and extending from the distal end of the first section. In several embodiments, the
first section is formed from a freeze-dried el made of chitosan and polyethylene glycol
polymer chains and/or crosslinks that expands when exposed to physiological fluid within a
puncture. In several embodiments, the second section is formed from a solid mass of eze-dried
, non-cross-linked hydrogel precursors, the precursors remaining in an unreactive
state until d to an aqueous physiological environment, whereupon the precursors
undergo in-situ crosslinking with one another to provide an improved adhesion of the sealant
to the arteriotomy.
In one embodiment, the first n may consist essentially of freeze-dried
el, and the second section may consist essentially of the oss-linked precursors.
Alternatively, the second section may include one or more rcement elements with
hemostatic ties, e.g., chitosan reinforcing fibers, a chitosan mesh or chitosan particles.
In addition or alternatively, the second section may e one or more diluents to enhance
one or more ties of the second section.
In another embodiment, the sealant includes only one section of a freezedried
hydrogel made of chitosan and polyethylene glycol polymer chains and/or crosslinks
that expands when exposed to physiological fluid within a puncture.
ally, the sealant may include one or more pH adjusting agents, e.g.,
impregnated into, coated over, or otherwise included in the first and/or second sections. For
example, when the sealant is exposed within a puncture, the s) may alter the localized
pH on or around the t, e.g., to enhance cross-linking of the precursors and/or creation
of a desired adhesive al. Alternatively, the materials for the precursors may be selected
16704496_1 (GHMatters) P104634.NZ 26/10/2020
such that the pH and/or buffering capacity of interstitial body fluids and/or blood are effective
to drive or otherwise facilitate linking of the precursors. In such embodiments, the pH
adjusting agents may be omitted.
In several embodiments, the first section of the sealant may be composed
of a freeze-dried hydrogel that contains polyethylene glycol chains covalently bonded with
chitosan polymer chains that has hemostatic and pro-coagulative properties and that expands
when exposed to physiological fluids within a puncture. A solid mass of non-cross-linked
el precursors such as polyethylene glycol with ester end groups, polyethylene glycol
with amine end groups and chitosan with various degrees of deacetylation, may be fused or
otherwise attached onto the distal end of the sealant. Until such time that the precursors are
exposed to an aqueous physiological environment, the precursors remain in an unreactive
state. At such time, the precursors undergo in-situ crosslinking with one another to provide
an improved adhesion to the arteriotomy.
In an additional embodiment, chitosan fibers, chitosan mesh or chitosan
particles may be incorporated or fused together with the oss-linked hydrogel
precursors. For example, the solid mass may be formed as a ntially uniform solid plug
or may be formed as a sintered mass of powder and fibers or mesh. The chitosan fibers, mesh
or particles may act as a reinforcement element to increase the integrity of the cross-linked
network. The melted precursors, which may or may not comprise chitosan fibers, chitosan
mesh or chitosan particles may be applied to the distal end of the r roll within the
tubular member, and allowed to solidify to create the solid mass fused to the distal end of the
tubular roll.
In accordance with one embodiment, a sealant is ed for sealing a
puncture through tissue that includes a first section ing a proximal end, a distal end,
and a cross-section sized for delivery into a re through tissue, and a second section
fused to and extending from the distal end of the first section. The first section may be
formed from a freeze-dried hydrogel that expands when exposed to physiological fluid within
a puncture. The second section may be formed from a solid mass of non-freeze-dried, noncross-linked
hydrogel precursors, the precursors remaining in an unreactive state until
exposed to an aqueous logical fluid, whereupon the precursors undergo in-situ
inking with one another to e an improved on of the sealant to the
arteriotomy.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
In one embodiment, the first section may consist ially of freeze-dried
hydrogel, and the second section may t essentially of the non-cross-linked precursors.
atively, the second section may include one or more reinforcement elements, e.g., a
plurality of filaments or particles, mixed with, embedded in, or surrounding the precursors.
In addition or alternatively, the second n may include one or more diluents to enhance
one or more properties of the second section. As discussed above, the sealant may (or may
not) e one or more pH adjusting agents, e.g., impregnated into, coated over, or
otherwise included in the first and/or second sections.
In r embodiment, a sealant is provided for sealing percutaneous
vascular large bore punctures, the sealant includes a first section including a proximal end, a
distal end, and a cross-section sized for transcatheter ry into the tissue tract and further
including chitosan, and can optionally include a second section fused to and extending from
the distal end of the first section. The large bore punctures can be sealed with a sealant that is
initially sized the same as or larger than the large bore puncture or, alternatively, can be
sealed with a sealant that is initially sized smaller than the large bore re by being
loaded onto a small bore delivery device. It is understood that the physical properties of the
sealant are such that it expands to occupy the full space of the device it is loaded upon, such
that the same size sealant can be loaded onto a large bore delivery device as well as a small
bore ry device, just that upon being loaded onto a small bore delivery device the sealant
would be compressed to fit into the smaller space. Large bore punctures can be arterial
punctures that are sized from about 7 French to about 24 French. It is typically understood
that small bore punctures can be arterial punctures sized up to about 7Fr.
BRIEF DESCRIPTION OF THE DRAWINGS
It will be appreciated that the gs are not necessarily drawn to scale,
with is instead being placed on illustrating the various aspects and features of the
illustrated embodiments.
is a perspective view of an exemplary embodiment of a sealant
member comprising a freeze-dried hydrogel made of chitosan and polyethylene glycol
polymer chains and/or crosslinks that expands when exposed to physiological fluid within a
puncture.
is a cross-sectional view of a transfer tube and mandrel, showing
a method for making the sealant member of
96_1 (GHMatters) P104634.NZ 26/10/2020
FIGS. 2A and 2B are side views of various embodiments in which
chitosan is incorporated into a sealant. shows as chitosan mesh, while FIG 2B
shows chitosan particles.
FIGS. 3A and 3B are perspective and side views, respectively, of another
embodiment of an apparatus for delivering a sealant into a re through tissue.
is a side view of the apparatus of FIGS. 3A and 3B with a n
of an outer g removed to show internal components of the apparatus.
is a perspective view of an introducer sheath and dilator assembly
that may be used in cooperation with the apparatus of FIGS. 3A-3C.
-4F illustrate a method of delivering a sealant to an arteriotomy
site.
FIGS. 5A, 5A-1, 5B, and 5B-1 illustrate a mechanism for controlling fluid
flow through an inflation line.
FIGS. 6A, 6A-1, 6B, and 6B-1 illustrate another mechanism for
controlling fluid flow through an inflation line.
FIGS. 6C-6D illustrate yet r mechanism for controlling fluid flow
through an inflation line.
FIGS. 6E-6F illustrate yet another ism for controlling fluid flow
through an inflation line.
FIGS. 7A, 7A-1, 7B, and 7B-1 illustrate yet another mechanism for
controlling fluid flow through an inflation line.
FIGS. 8A-8B illustrate a mechanism for controlling nt of an outer
housing relative to an inner housing.
FIGS. 9A-9B rate another mechanism for controlling movement of an
outer housing relative to an inner housing.
FIGS. 10A-10B illustrate yet another mechanism for controlling
movement of an outer housing relative to an inner housing.
FIGS. 11A-11C illustrate a locking mechanism to prevent actuation of a
t member.
FIGS 12A-12B illustrate a mechanism for advancing a support member.
FIGS. B rate another mechanism for advancing a t
member.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
FIGS. 14A-14B illustrate a retraction lock to restrict movement of a
positioning assembly.
FIGS. 15A-15F illustrate another method for delivering a sealant to an
otomy site.
FIGS. 16A-16B illustrate an apparatus for delivering a sealant to an
arteriotomy including an inflation tor.
FIGS. 17A-17D rate an embodiment of a dilator configured to engage
a sheath.
FIGS. 18A-18C rate another embodiment of a dilator configured to
engage a sheath.
FIGS. 19A-19D-1 illustrate a mechanism for engaging a positioning
assembly and a sheath.
illustrates another mechanism for engaging a positioning assembly
and a sheath.
FIGS. 21A-21I illustrate a method for delivering a sealant to an
arteriotomy site.
DETAILED DESCRIPTION
The apparatus, sealant and method disclosed herein capitalize on the
interactions between chitosan and PEG moieties (e.g., PEG-amine and PEG-ester) to achieve
enhanced hemostatic and procoagulative properties with improved integrity of the crosslinked
sealant (both the grip and the freeze dried portion) after activation by physiological
fluids. Chitosan can be covalently or non-covalently bonded, depending on the embodiment,
with PEG to create the sealants. In addition, various cross linkers (e.g., genipin) can be used
to crosslink chitosan polymer chains to create high molecular weight hydrogels of pure
chitosan. The hydrogels can then be ated by freeze drying to make a porous mesh that
can be orated in the second section (the “grip” section) of a sealant to improve the
ity and stability of the final cross-linked network (after contact with logical
fluids). ts
shows a non-limiting embodiment of a sealant 2 for sealing a
puncture extending h tissue (not shown), such as a blood vessel. Generally, the sealant
2 can include a first, al, or main section 4 ing proximal and distal ends 4a, 4b,
and a second, distal, or tip section 6 formed from a plurality of eeze-dried and/or non-
16704496_1 (GHMatters) P104634.NZ 26/10/2020
linked precursors, e.g., formed as a solid mass or solid plug, fused or otherwise
attached to and extending distally from the distal end 4b of the first section 4. As described
further below, the non-cross-linked precursors may remain in an unreactive state, e.g., before
or until exposure to an aqueous physiological environment, e.g., when deployed or ise
exposed within a puncture extending through tissue.
For example, this configuration of sealant 2 may combine crosslinking of
the second n 6 to create an adhesive material in-situ with swell characteristics and procoagulative
properties of a freeze-dried hydrogel or other expandable material of the first
n 4. By incorporating chitosan into a polyethylene glycol polymer network, the overall
freeze dried hydrogel results in ctedly enhanced extra-vascular closure by providing
expansion of the freeze dried hydrogel within the tissue tract upon contact with physiological
fluid and ing hemostatic and pro-coagulative properties that, in combination, result in
faster l asis of the vessel.
In one embodiment, the first section 4 can be formed from a sheet of
freeze-dried hydrogel rolled into a tubular shape. It will be appreciated that the first section 4
may have other tubular or solid rod cross-sections or shapes, as desired, such as elliptical,
triangular, square, conical, disk, polygonal , and the like (not .
The first section 4 can be formed from a freeze-dried and cross-linked
hydrogel that comprises two components, one being polyethylene glycol (“PEG”) and the
other component being chitosan. The two polymers, PEG and chitosan may be covalently
bonded or blended together to form a freeze dried polymer hydrogel that expands upon
contact with physiological fluids and that has hemostatic properties. Non-covalent bonding
may also be used, in several embodiments. Optionally, a transition zone (not shown) may be
included where the al of the second section 6 can penetrate partially into the distal end
4b of the first section 4, e.g., during fusion, as described further below. Some such
embodiments enhance the structural stability of the t, further enhancing hemostasis.
In several embodiments, the al of the first section 4 may be at least
partially absorbed by the body over time, e.g., over a period of days, weeks, or months.
Likewise, the material of the second n 6 may also be at least partially absorbed by the
body over time, e.g., over a period of days, weeks, or months. Depending on the
embodiment, the first section 4 and second section 6 can be made of the same material. In
some embodiments, the composition of the first section 4 and the second n 6 can be
adjusted to accommodate their relative roles in the hemostatic process and the eventual
16704496_1 (GHMatters) P104634.NZ 26/10/2020
healing of the puncture. For e, in several embodiments, the rate of absorption of the
second section 6 can be slower than that of the first section 4, thereby maintaining the sealant
over the re for a longer period of time, thus allowing the underlying vessel time to
heal. The rate of degradation (and thus the specific make-up of the sealant) can be selected
based on the size of puncture, rate of blood flow (or interstitial fluid flow) or blood pressure
at the puncture site, or the degree of mobility that the puncture site will experience (e.g.,
healing may take longer at a puncture site that experiences frequent forces from body
The PEG/chitosan co-polymer sealant can comprise two portions PEG
(one portion PEG-amine and one n PEG-ester) to one n chitosan. In several
embodiments, the chitosan can be at least lly deacetylated. It should be noted that the
term “portion”, as used herein, does not necessary indicate a quantity or ratio of the various
components. Rather, specific details about further aspects of the sealants, including their
specific compositions, are discussed below.
Polyethylene Glycol
The PEG used in the sealant can be varied, depending on the embodiment
and factors such as the anticipated re size, the normal rate of blood flow in the area of
the puncture, the physical status of a patient (e.g., on anti-coagulant medication, etc.). In
several embodiments, the PEG-amine portion may be a r such as 8A20K-NH2 (e.g.,
8-arm 20 lton (kDa) molecular weight, with amine terminated arms). In l
embodiments, the ter portion may be a polymer such as 4A10K-CM-HBA-NHS (e.g.,
4-arm, 10kDa molecular weight, with carboxymethyl - hydroxybutyrate -N-
hydroxysuccinimidyl functional groups on the arms). In another embodiment the PEG-ester
portion may be a polymer such as 4A 10K-SS-NHS (e.g., 4-arm, 10kDa molecular weight
with succinimidyl succinate functional groups on the arms) or a polymer such as 4A10K-SGNHS
(e.g., 4-arm, 10kDa molecular weight with succinimidyl glutarate functional groups on
the arms) or a e of these polymers.
In various embodiments, different precursors may be used to manufacture
both the first section 4 and the second section 6 of the sealant. For example, the precursors
may se polyethylene glycol derivatives or polyethylene glycols with at least two end
groups (e.g., 2 arms) and having at least one cross-linkable end group. The first onal
group may chemically react with the second functional group in-situ to form covalent bonds
and thereby form a cross-linkable gel. In some embodiments, the first functional group or
16704496_1 (GHMatters) P104634.NZ 26/10/2020
second functional group can se strong electrophiles. For example, the first and/or
second functional group may be one or more of epoxide, succinimide, N-
hydroxysuccinimide, acrylate, methacrylate, maleimide, and N-hydroxysulfosuccinimide.
Additionally, in some embodiments, the first and/or second functional group may be an
amine group, a sulfhydryl group, a carboxyl group, and/or a hydroxyl group.
Depending on the embodiments, PEGs of various molecular weights may
be used. As discussed above, the determination of lar weight can be made based on
the desired structural integrity that the sealant will need to possess, the rate of blood or fluid
flow at the puncture site, the disappearance time and other clinical variables. In several
embodiments, the molecular weight of the polyethylene glycols may range from about 2500
Daltons to about 50,000 Daltons. This includes polyethylene glycols with molecular weights
ranging from about 2500 Daltons to about 5000 Daltons, about 5000 Daltons to about 10,000
Daltons, about 10,000 Daltons to about 15,000 Daltons, about 15,000 Daltons to about
,000 Daltons, about 20,000 Daltons to about 25,000 Daltons, about 25,000 Daltons to
about 30,000 Daltons, about 30,000 s to about 35,000 s, about 35,000 s
to about 40,000 Daltons, about 40,000 s to about 45,000 Daltons, about 45,000
Daltons to about 50,000 Daltons, and any lar weight n those listed.
Depending on the embodiments, the polyethylene glycols may have a
varied number of functional groups. For example, in several embodiments, the polyethylene
glycols may include two to eight functional groups, including three, four, five, six, or seven
functional groups. Mixtures of polyethylene glycols with varied s of functional
groups are also used in some embodiments.
Various derivatives of polyethylene glycol can also be used, depending on
the embodiment. Non-limiting examples of the polyethylene glycol tives that may be
used include, but are not limited to, branched polyethylene glycol derivatives,
heterofunctional polyethylene glycol derivatives, linear monofunctional polyethylene glycol
derivatives, and even combinations thereof. Non-limiting examples of branched hylene
glycol tives include, but are not limited to, Y-Shape PEG NHS ester (molecular weight
of ~ 40000 Da), Y-Shape PEG maleimide ular weight of ~ 40000 Da), Y-Shape PEG
acetaldehyde (molecular weight of ~ 40000 Da), Y-Shape PEG propionaldehyde ular
weight of ~ 40000 Da). Non-limiting examples of heterofunctional polyethylene glycol
derivatives include, but are not limited to, hydroxyl PEG carboxyl (molecular weight of ~
3500 Da), hydroxyl PEG amine, HCl Salt (molecular weight of ~ 3500 Da), amine PEG
16704496_1 (GHMatters) P104634.NZ 26/10/2020
carboxyl, HCl Salt, ular weight of ~ 3500 Da), acrylate PEG NHS ester (molecular
weight of ~ 3500 Da), maleimide PEG amine, TFA Salt (molecular weight of ~ 3500 Da),
maleimide PEG NHS ester (molecular weight of ~ 3500 Da), 4-arm PEG succinimidyl
succinate (pentaerythritol) (molecular weight of ~ 10000 Da), 8-arms PEG amine (molecular
weight of ~ 10000 - ~20000 Da). Non-limiting examples of linear monofunctional
polyethylene glycol derivatives include, but are not limited to methoxy PEG succinimidyl
ymethyl ester, (molecular weight of ~ 10000 - ~20000 Da), methoxy PEG maleimide
(molecular weight of ~ 10000 - ~20000 Da), y PEG ulfone (molecular weight of
~ 10000 - ~20000 Da), methoxy PEG thiol (molecular weight of ~ 10000 - ~20000 Da),
methoxy PEG propionaldehyde (molecular weight of ~ 10000 - ~20000 Da), methoxy PEG
amine, HCl Salt ular weight of ~ 10000 - ~20000 Da).
Chitosan
As discussed above, the mer sealant can comprise one portion
chitosan. In several embodiments, the chitosan can be at least partially deacetylated. In one
embodiment, the chitosan can be at least about 50% deacetylated. Chitosan that has a degree
of deacetylation between about 60% and about 99% is used in l embodiments,
including chitosan having a degree of deacetylation between about 60% and about 65%,
between about 65% and about 70%, between about 70% and about 75%, between about 75%
and about 80%, between about 80% and about 85%, between about 85% and about 90%,
between about 90% and about 95%, between about 95% and about 96%, between about 96%
and about 97%, between about 97% and about 98%, between about 98% and about 99%, and
any degree of deacetylation between those values.
As with the PEG components, the chitosan can have a varied molecular
weight, depending on the embodiment. While chitosan can have a varied molecular weight
based on its production method, several embodiments of the sealant comprise chitosan having
molecular weights between about 10 kilodaltons (kDa) and about 600 kDa. For example, in
several ments, the chitosan component has a molecular weight of between about 10
kDa and about 50 kDa, n about 50 kDa and about 100 kDa, between about 100 kDa
and about 150 kDa, between about 150 kDa and about 200 kDa, between about 200 kDa and
about 250 kDa, between about 250 kDa and about 300 kDa, between about 300 kDa and
about 350 kDa, n about 350 kDa and about 400 kDa, between about 400 kDa and
about 500 kDa, between about 500 kDa and about 600 kDa, and any molecular weight
between these ranges.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
In one embodiment, the chitosan component comprises a chitosan having a
lar weight n 150kDa and 400kDa and a degree of deacetylation of at least 90%.
In another embodiment, the chitosan component comprises a chitosan
having a molecular weight between 150kDa and 400kDa and a degree of deacetylation
between 75% and 90%.
The an precursors can optionally be in the free amine form or,
alternatively in a salt form of chitosan. Suitable salts include, but are not limited to chitosan
chloride, chitosan glutamate, chitosan acetate or other salt forms of chitosan. Mixtures of
s salts and/or salts with the free amine form of chitosan may also be used.
PEG-Chitosan Ratios
As discussed above, in several embodiments, the sealant can comprise two
portions PEG (e.g., PEG amine and PEG ester) and one portion chitosan. The molar ratio of
the components can be varied, depending on the desired properties of the sealant (e.g., time to
hemostasis, etc.). Depending on the embodiment, chitosan may be present in a molar ratio of
chitosan to PEG of about 0.0001 to about 1.0. For example, the chitosan may be present in a
molar ratio of chitosan to PEG of from about 0.0001 to about , from about 0.0005 to
about 0.001, from about 0.001 to about 0.005, from about 0.005 to about 0.01, from about
0.01 to about 0.05, from about 0.05 to about 0.1, from about 0.1 to about 0.2, from about 0.2
to about 0.3, from about 0.3 to about 0.4, from about 0.4 to about 0.5, from about 0.5 to about
0.6, from about 0.6 to about 0.7, from about 0.7 to about 0.8, from about 0.8 to about 0.9,
from about 0.9 to about 1,or any ratios there between (and including nts).
Depending on the embodiment, the chitosan may also be present in the
sealant composition based on a percentage of the t formulation (weight/weight, weight
per volume, or volume/volume). For example, the chitosan may be present in a weight
percentage in the entire formulation from about 0.1 % to about 30%, such as about 0.1%,
about 1%, about 3%, about 4%, about 5%, about 6%, about 10%, about 15%, about 20%,
about 25%, or about 30% (or percentages between those listed). In several embodiments, the
chitosan can be present in an amount from about 0.1% to about 30 %, about 0.5 % to about
%, about 0.5 % to about 15 %, about 0.5 % to about 10 %, about 0.5 % to about 8 %,
about 0.5 % to about 6 %, about 0.5 % to about 4 %, about 2 % to about 4 %, or any amount
there between. In another embodiment, the first section comprises between about 4% and
about 6% (by weight) chitosan. Greater or lesser amounts of chitosan can also be used. In
still onal embodiments, the weight ratio of chitosan in the final el formulation is
16704496_1 ters) P104634.NZ 26/10/2020
between about 1% and about 6% by weight of chitosan, including about 1% to about 2%,
about 2% to about 3%, about 3% to about 4%, about 4% to about 5%, about 5% to about 6%,
and tages in between those listed (and including nts).
Depending on the embodiment, PEG-amine may be present in a molar
ratio of PEG-amine to PEG-ester and chitosan of about 0.09 to about 9.9. For example, the
PEG-amine may be present in a molar ratio of PEG-amine to the PEG-ester and chitosan of
about 0.09 to about 0.1, about 0.1 to about 0.2, of about 0.2 to about 0.3, of about 0.3 to about
0.4, of about 0.4 to about 0.5, of about 0.5 to about 0.6, of about 0.6 to about 0.7, of about 0.7
to about 0.8, of about 0.8 to about 0.9, about 0.9 to about 1.0, about 1.0 to about 2.0, about
2.0 to about 3.0, about 3.0 to about 4.0, about 4.0 to about 5.0, about 5.0 to about 6.0, about
6.0 to about 7.0, about 7.0 to about 8.0, about 8.0 to about 9.0, about 9.0 to about 9.9, or any
amount there between (and including endpoints).
Alternatively, PEG-amine may be present in the sealant composition based
on a percentage of the sealant ation (weight/weight, weight per volume, or
volume/volume). For example, the PEG-amine may be present in a weight percentage in the
entire formulation from about 99.0% to about 1.0%, about 90.0% to about 10.0%, about
80.0% to about 20.0%, about 70.0% to about 30.0%, about 60.0% to about 40.0%, about
55.0% to about 45.0%, about 53.0% to about 47.0%, about 52.0% to about 48.0%, about
50.0% to about 48.0%, and any percentage between or including those amounts.
ing on the embodiment, PEG-ester may be present in a molar ratio
of PEG-ester to PEG-amine and chitosan of about 0.09 to 19.9. For example, the PEG-ester
may be present in a molar ratio of PEG-ester to PEG-amine and chitosan of about 0.09 to
about 0.1, about 0.1 to about 0.2, of about 0.2 to about 0.3, of about 0.3 to about 0.4, of about
0.4 to about 0.5, of about 0.5 to about 0.6, of about 0.6 to about 0.7, of about 0.7 to about 0.8,
of about 0.8 to about 0.9, about 0.9 to about 1.0, about 1.0 to about 2.0, about 2.0 to about
3.0, about 3.0 to about 4.0, about 4.0 to about 5.0, about 5.0 to about 6.0, about 6.0 to about
7.0, about 7.0 to about 8.0, about 8.0 to about 9.0, about 10 to about 11, about 11 to about 12,
about 12 to about 13, about 13 to about 14, about 14 to about 15, about 15 to about 16, about
16 to about 17, about 17 to about 18, about 18 to about 19, 19 to about 19.9, or any amount
there between.
ing on the embodiment, PEG-ester may be present in the t
ition based on a percentage of the sealant formulation (weight/weight, weight per
volume, or volume/volume). For example, the PEG-ester may be present in a weight
16704496_1 (GHMatters) P104634.NZ 26/10/2020
percentage in the entire formulation from about 99.0% to about 1.0%, about 90.0% to about
.0%, about 80.0% to about 20.0%, about 70.0% to about 30.0%, about 60.0% to about
40.0%, about 55.0% to about 45.0%, about 53.0% to about 47.0%, about 52.0% to about
48.0%, about 52.0% to about 50.0%, and any percentage between or including those
amounts.
In l embodiments, the molar ratio of chitosan to PEG-ester is
between approximately 0.0001 to about 1. In another embodiment, the molar ratio of
chitosan to PEG-ester is between approximately 0.0001 to about 0.005. In yet another
embodiment the molar ratio of chitosan to PEG-ester is between approximately 0.005 to
about 0.01. In several embodiments the equivalent ratio of active group sites of chitosan to
the active group sites of PEG-ester is between approximately 0.01 to about 9. In another
embodiment the equivalent ratio of active group sites of chitosan to the active group sites of
PEG-ester is between imately 0.01 to about 2. In another embodiment the equivalent
ratio of active group sites of chitosan to the active group sites of PEG-ester is n
approximately 0.1 to about 2. In another embodiment the equivalent ratio of active group
sites of chitosan to the active group sites of PEG-ester is between approximately 0.5 to about
1.5.
As discussed above, in several embodiments a second section may be
present and may consist essentially of the non-cross-linked sors. In several
embodiments, the second section can be formed from a solid mass of non-freeze-dried, noncross-linked
el precursors, the precursors remaining in an unreactive state until
exposed to an aqueous physiological environment, whereupon the precursors undergo in-situ
inking with one another to provide an improved on of the sealant to the
arteriotomy. The hydrogel precursors may comprise polyethylene glycol with ester end
groups, polyethylene glycol with amine end groups that are fused or otherwise attached onto
the distal end of the sealant. an with various degrees of ylation may or may not
be t in the second section. Chitosan’s weight percentage in the second section may
vary from 0.1% to 80%, if present. In another embodiment chitosan is present in the second
section in a weight percentage between 1% and 30%. In yet another embodiment chitosan is
present in the second section in a weight percentage between 10% and 30%. In an additional
ment, an fibers, chitosan mesh or chitosan particles may be incorporated or
fused together with the non-cross-linked hydrogel precursors. For example, the solid mass
may be formed as a substantially uniform solid plug or may be formed as a sintered mass of
16704496_1 (GHMatters) P104634.NZ 26/10/2020
powder and fibers or mesh. The chitosan fibers, mesh or particles may act as a reinforcement
element to increase the integrity of the cross-linked network. The melted precursors, which
may or may not comprise chitosan fibers, chitosan mesh or chitosan particles may be applied
to the distal end of the tubular roll within the tubular member, and allowed to solidify to
create the solid mass fused to the distal end of the tubular roll.
While several embodiments relate to the use of chitosan-containing
copolymers, the chitosan may also be used independently as a sealant to reduce the time to
hemostasis. In such embodiments, the an ranges from about 0.01% of the sealant to
about 99.9% of the sealant.
Additional Agents
In additional embodiments, one or more additional compositions can be
added to the co-polymer sealant. In several embodiments, the additional agents are added to
the sealant to facilitate sealing of the puncture. In l embodiments, pro-thrombotic
agents may be included in the sealant. For example, biological pro-thrombotics are ed,
in several embodiments. These include, but are not limited to, one or more of en,
fibrin, fibrinogen, thrombin, Factor VIII, Factor IX, Factor X, calcium salts,
carboxymethylcellulose, oxidized cellulose, alginates, gelatin, or other protein-based
material. Synthetic materials that facilitate thrombosis may include ycolic acids
(PGA's), polylactides (PLA's), polyvinyl alcohol (PVA), and the like.
In several ments, the first section 4 r second section 6) may
r include therapeutic and/or pharmaceutical agents, e.g., to promote healing, prevent
infection and/or other adverse medical , and the like.
For example, in several ments, the sealant may further comprise
one or more drugs ed below, either alone or in combination. The drugs utilized may
also be the equivalent of, derivatives of, or analogs of one or more of the drugs provided
below. The drugs may e but are not limited to pharmaceutical agents including
antimicrobial agents (e.g., antibiotic, antiviral, antiparasitic, antifungal ), antiinflammatory
agents (including steroids or non-steroidal anti-inflammatory), biological
agents including hormones, enzymes or enzyme-related components, antibodies or dyrelated
components, oligonucleotides (including DNA, RNA, interfering RNA,
antisense oligonucleotides, and the like), DNA/RNA vectors, viruses (either wild type or
genetically modified) or viral vectors, peptides, ns, enzymes, extracellular matrix
components, and live cells configured to produce one or more biological components. The
16704496_1 (GHMatters) P104634.NZ 26/10/2020
use of any particular drug is not limited to its primary effect or regulatory body-approved
treatment indication or manner of use. Drugs also include compounds or other materials that
reduce or treat one or more side effects of another drug or therapeutic agent. As many drugs
have more than a single mode of , the listing of any particular drug within any one
eutic class below is only representative of one possible use of the drug and is not
intended to limit the scope of its use with the ophthalmic implant system.
As discussed above, the therapeutic agents that are included in the sealant
may be combined with any number of excipients as is known in the art. Excipients that are
suitable for use include, but are not limited to, radable polymeric excipients, benzyl
alcohol, ethylcellulose, methylcellulose, hydroxymethylcellulose, cetyl alcohol,
croscarmellose sodium, dextrans, dextrose, fructose, gelatin, glycerin, monoglycerides,
diglycerides, kaolin, calcium chloride, lactose, lactose monohydrate, maltodextrins,
polysorbates, atinized starch, calcium stearate, magnesium stearate, silicon dioxide,
cornstarch, talc, and the like. The one or more ents may be included in total amounts as
low as about 1%, 5%, or 10% and in other embodiments may be included in total s as
high as about 50%, 70% or 90%.
Examples of drugs that may be used in the sealant may include various
anti-secretory ; antimitotics and other anti-proliferative agents, adrenergic antagonists,
including for example, beta-blocker agents such as atenolol propranolol, metipranolol,
betaxolol, carteolol, levobetaxolol, levobunolol and timolol; adrenergic agonists or
sympathomimetic agents such as epinephrine, dipivefrin, clonidine, aparclonidine, and
brimonidine; parasympathomimetics or geric agonists such as pilocarpine, hol,
phospholine iodine, and physostigmine, salicylate, acetylcholine de, e,
diisopropyl fluorophosphate, demecarium bromide); muscarinics; carbonic ase
inhibitor agents, including topical and/or systemic agents, for example acetozolamide,
brinzolamide, dorzolamide and methazolamide, ethoxzolamide, diamox, and
dichlorphenamide; mydriatic-cycloplegic agents such as atropine, cyclopentolate,
succinylcholine, homatropine, ephrine, scopolamine and tropicamide; prostaglandins
such as prostaglandin F2 alpha, antiprostaglandins, prostaglandin precursors, or prostaglandin
analog agents such as prost, latanoprost, travoprost and unoprostone.
Other examples of drugs that may be included in the sealant may also
include anti-inflammatory agents including for example glucocorticoids and corticosteroids
such as betamethasone, cortisone, dexamethasone, dexamethasone 21-phosphate,
16704496_1 ters) 4.NZ 26/10/2020
methylprednisolone, prednisolone 21-phosphate, prednisolone acetate, prednisolone,
fluroometholone, loteprednol, medrysone, fluocinolone ide, triamcinolone acetonide,
triamcinolone, triamcinolone acetonide, beclomethasone, budesonide, flunisolide,
fluorometholone, fluticasone, hydrocortisone, hydrocortisone acetate, loteprednol,
rimexolone and non-steroidal anti-inflammatory agents including, for example, diclofenac,
profen, ibuprofen, bromfenac, nepafenac, and ketorolac, late, indomethacin,
ibuprofen, naxopren, piroxicam and nabumetone; anti-infective or antimicrobial agents such
as antibiotics including, for example, tetracycline, etracycline, bacitracin, neomycin,
polymyxin, gramicidin, cephalexin, oxytetracycline, chloramphenicol, rifampicin,
ciprofloxacin, tobramycin, gentamycin, erythromycin, penicillin, sulfonamides, sulfadiazine,
sulfacetamide, sulfamethizole, sulfisoxazole, nitrofurazone, sodium propionate,
aminoglycosides such as gentamicin and tobramycin; fluoroquinolones such as ciprofloxacin,
gatifloxacin, levofloxacin, moxifloxacin, norfloxacin, ofloxacin; bacitracin, erythromycin,
fusidic acid, neomycin, polymyxin B, idin, trimethoprim and sulfacetamide;
antifungals such as amphotericin B and zole; antivirals such as idine
trifluorothymidine, acyclovir, gancyclovir, interferon; antimicotics; immune-modulating
agents such as antiallergenics, including, for e, sodium chromoglycate, antazoline,
methapyriline, heniramine, cetrizine, pyrilamine, prophenpyridamine; istamine
agents such as azelastine, emedastine and levocabastine; immunological drugs (such as
vaccines and immune stimulants); MAST cell stabilizer agents such as cromolyn sodium,
ketotifen, lodoxamide, nedocrimil, olopatadine and pemirolastciliary body ablative agents,
such as gentimicin and cidofovir; and other ophthalmic agents such as verteporfin,
proparacaine, tetracaine, cyclosporine and pilocarpine; inhibitors of cell-surface glycoprotein
receptors; estants such as ephrine, naphazoline, tetrahydrazoline; lipids or
hypotensive lipids; dopaminergic agonists and/or antagonists such as quinpirole, opam,
and ibopamine; vasospasm inhibitors; vasodilators; pertensive agents; angiotensin
converting enzyme (ACE) inhibitors; angiotensin-1 receptor antagonists such as olmesartan;
microtubule inhibitors; molecular motor (dynein and/or kinesin) inhibitors; actin cytoskeleton
regulatory agents such as cyctchalasin, latrunculin, swinholide A, ethacrynic acid, H-7, and
Rho-kinase (ROCK) inhibitors; remodeling inhibitors; modulators of the extracellular matrix
such as tert-butylhydro-quinolone and AL-3037A; adenosine or agonists and/or
antagonists such as Ncylclophexyladenosine and (R)-phenylisopropyladenosine; serotonin
agonists; hormonal agents such as estrogens, estradiol, tational hormones,
16704496_1 (GHMatters) P104634.NZ 26/10/2020
progesterone, insulin, onin, parathyroid hormone, peptide and vasopressin
hypothalamus releasing factor; growth factor antagonists or growth factors, including, for
example, epidermal growth factor, last growth factor, platelet derived growth factor or
antagonists thereof, transforming growth factor beta, somatotrapin, fibronectin, connective
tissue growth factor, bone morphogenic proteins (BMPs); cytokines such as interleukins,
CD44, cochlin, and serum amyloids, such as serum amyloid A.
Other therapeutic agents may include neuroprotective agents such as
lubezole, nimodipine and related compounds, and including blood flow enhancers such as
dorzolamide or betaxolol; compounds that promote blood oxygenation such as erythropoeitin;
sodium channels blockers; calcium channel blockers such as ipine or lomerizine;
glutamate inhibitors such as memantine nitromemantine, riluzole, dextromethorphan or
agmatine; acetylcholinsterase inhibitors such as galantamine; hydroxylamines or tives
thereof, such as the water soluble hydroxylamine derivative OT-440; synaptic modulators
such as hydrogen sulfide nds containing oid glycosides and/or terpenoids, such
as ginkgo biloba; neurotrophic s such as glial cell-line derived neutrophic factor, brain
derived neurotrophic ; cytokines of the IL-6 family of proteins such as ciliary
neurotrophic factor or leukemia inhibitory factor; compounds or factors that affect nitric
oxide levels, such as nitric oxide, nitroglycerin, or nitric oxide se inhibitors;
cannabinoid or agonsists such as WIN552; free radical scavengers such as
methoxypolyethylene glycol thioester (MPDTE) or methoxypolyethlene glycol thiol coupled
with EDTA methyl triester (MPSEDE); xidants such as astaxathin, dithiolethione,
vitamin E, or metallocorroles (e.g., iron, manganese or gallium corroles); compounds or
factors involved in oxygen homeostasis such as neuroglobin or obin; inhibitors or
factors that impact mitochondrial division or n, such as Mdivi-1 (a ive inhibitor of
n related protein 1 (Drp1)); kinase inhibitors or modulators such as the Rho-kinase
inhibitor H-1152 or the ne kinase inhibitor AG1478; compounds or factors that affect
integrin function, such as the Βeta 1-integrin ting antibody HUTS-21; N-acylethanaolamines
and their precursors, N-acyl-ethanolamine phospholipids; stimulators of
glucagon-like peptide 1 receptors (e.g., glucagon-like e 1); polyphenol containing
compounds such as resveratrol; chelating compounds; apoptosis-related protease inhibitors;
nds that reduce new protein synthesis; radio-therapeutic agents; photodynamic
therapy agents; gene therapy agents; c modulators; auto-immune modulators that
prevent damage to nerves or portions of nerves (e.g., demyelination) such as glatimir; myelin
16704496_1 (GHMatters) P104634.NZ 26/10/2020
inhibitors such as anti-NgR Blocking Protein, NgR(310)ecto-Fc; other immune modulators
such as FK506 binding proteins (e.g., FKBP51).
Other therapeutic agents that may be used include: other beta-blocker
agents such as acebutolol, atenolol, bisoprolol, carvedilol, l, labetalol, nadolol,
penbutolol, and pindolol; other corticosteroidal and non-steroidal nflammatory agents
such aspirin, betamethasone, cortisone, diflunisal, etodolac, fenoprofen, fludrocortisone,
flurbiprofen, hydrocortisone, ibuprofen, indomethacine, ketoprofen, meclofenamate,
mefenamic acid, meloxicam, methylprednisolone, nabumetone, naproxen, oxaprozin,
prednisolone, prioxicam, salsalate, sulindac and tolmetin; COX-2 inhibitors like xib,
rofecoxib and. Valdecoxib; other immune-modulating agents such as aldesleukin,
adalimumab (HUMIRA®), azathioprine, basiliximab, daclizumab, etanercept (ENBREL®),
hydroxychloroquine, infliximab (REMICADE®), leflunomide, methotrexate, mycophenolate
mofetil, and sulfasalazine; other anti-histamine agents such as loratadine, desloratadine,
cetirizine, hydramine, chlorpheniramine, dexchlorpheniramine, clemastine,
cyproheptadine, fexofenadine, hydroxyzine and promethazine; other anti-infective agents
such as aminoglycosides such as amikacin and streptomycin; anti-fungal agents such as
amphotericin B, caspofungin, clotrimazole, fluconazole, itraconazole, ketoconazole,
voriconazole, terbinafine and nystatin; anti-malarial agents such as chloroquine, atovaquone,
mefloquine, primaquine, quinidine and quinine; anti-mycobacterium agents such as
utol, isoniazid, pyrazinamide, rifampin and tin; anti-parasitic agents such as
azole, mebendazole, thiobendazole, metronidazole, pyrantel, atovaquone, iodoquinaol,
ivermectin, cin, praziquantel, and trimatrexate; other anti-viral agents, ing anti-
CMV or anti-herpetic agents such as acyclovir, cidofovir, famciclovir, gangciclovir,
clovir, valganciclovir, vidarabine, trifluridine and foscarnet; protease inhibitors such as
vir, saquinavir, lopinavir, indinavir, atazanavir, avir and nelfinavir;
nucleotide/nucleoside/non-nucleoside reverse transcriptase inhibitors such as abacavir, ddI,
3TC, d4T, ddC, tenofovir and emtricitabine, delavirdine, efavirenz and nevirapine; other antiviral
agents such as interferons, ribavirin and trifluridiene; other anti-bacterial agents,
including cabapenems like ertapenem, imipenem and meropenem; osporins such as
cefadroxil, cefazolin, cefdinir, cefditoren, cephalexin, cefaclor, cefepime, cefoperazone,
cefotaxime, cefotetan, cefoxitin, cefpodoxime, zil, idime, ceftibuten,
ceftizoxime, ceftriaxone, cefuroxime and loracarbef; other macrolides and ketolides such as
azithromycin, clarithromycin, dirithromycin and romycin; penicillins (with and without
16704496_1 (GHMatters) P104634.NZ 26/10/2020
anate) including amoxicillin, ampicillin, pivampicillin, dicloxacillin, nafcillin,
oxacillin, piperacillin, and ticarcillin; yclines such as doxycycline, minocycline and
tetracycline; other anti-bacterials such as aztreonam, chloramphenicol, clindamycin,
linezolid, nitrofurantoin and vancomycin; alpha blocker agents such as doxazosin, prazosin
and terazosin; calcium-channel blockers such as amlodipine, bepridil, diltiazem, pine,
isradipine, nicardipine, nifedipine, nisoldipine and verapamil; other anti-hypertensive agents
such as clonidine, diazoxide, fenoldopan, hydralazine, minoxidil, nitroprusside,
phenoxybenzamine, epoprostenol, tolazoline, treprostinil and nitrate-based agents;
glandin PDE-5 inhibitors and other glandin agents such as alprostadil, carboprost,
sildenafil, tadalafil and vardenafil; anti-proliferative agents such as sirolimus, tacrolimus,
everolimus, zotarolimus, paclitaxel and enolic acid; hormonal-related agents
including levothyroxine, mestrone, methyltestosterone, nandrolone, oxandrolone,
testosterone, estradiol, estrone, estropipate, clomiphene, gonadotropins,
hydroxyprogesterone, levonorgestrel, medroxyprogesterone, megestrol, mifepristone,
norethindrone, oxytocin, progesterone, raloxifene and tamoxifen; anti-neoplastic agents,
including alkylating agents such as tine lomustine, melphalan, cisplatin, uracil3,
and procarbazine antibiotic-like agents such as cin, daunorubicin, doxorubicin,
idarubicin, mitomycin and plicamycin; anti proliferative agents (such as 1,3-cis retinoic acid,
rouracil, taxol, cin, cin C and cisplatin); antimetabolite agents such as
cytarabine, fludarabine, hydroxyurea, mercaptopurine and 5-fluorouracil (5-FU); immune
modulating agents such as aldesleukin, imatinib, rituximab and tositumomab; mitotic
inhibitors docetaxel, etoposide, vinblastine and vincristine; radioactive agents such as
strontium-89; and other anti-neoplastic agents such as irinotecan, topotecan and mitotane.
Optionally, the second section may further include one or more pH
adjusting agents. For example, a pH adjusting agent, e.g., sodium borate, sodium phosphate,
sodium bicarbonate, and/or other salts, such as Na2B4O710H2O in crystalline or powder
form, may be melted with the precursors (as discussed in more detail below) and then applied
with the precursors to the distal end 4b of the first section 4. Alternatively, the pH adjusting
agent may be applied to the second section 6 after fusing the melted precursors to the first
n 4, e.g., by bonding or impregnating ls of borate or other salts to the outer
surface of the solid mass of non-cross-linked sors and/or by melting and applying a
coating of melted salts to the outer surface, e.g., similar to embodiments disclosed in the
16704496_1 (GHMatters) P104634.NZ 26/10/2020
references incorporated by reference elsewhere herein. In addition or alternatively, one or
more pH adjusting agents may be provided on the first section 4, if desired.
In this manner, the pH adjusting agent may alter the localized pH on or
around the sealant 2, e.g., when deployed within a puncture to enhance cross-linking and/or
on of a desired adhesive material. Alternatively, the pH and/or buffering capacity of
interstitial body fluids and/or blood may be effective to drive or facilitate linking of the
second section 6. For example, the precursors of the second section 6 may be optimized to
take into account all of these s and/or form a robust adherence to tissue.
In additional ments, other agents such as diluents, including but not
limited to, low molecular PEG and/or ol, may be added to the sealant.
These additional agents may be embedded in the sealant, encased in the
sealant (e.g., as a “core”), co-fabricated with the sealant, and/or applied as one or more
coatings or layers. In addition, the material of the first section 4 may have a ntially
uniform ition or the composition may be varied, e.g., along its length and/or within
underlying layers within the first section 4.
Sealant Fabrication
In l ments, the first section 4 may be formed entirely from
freeze-dried hydrogel, e.g., initially formed as a thin sheet of -dried polymer. For
example, to fabricate the first section 4 from blends of PEG and chitosan, PEG-amine, PEG-
ester and chitosan powders intended to form the hydrogel may be filled into separate vessels
(e.g., vials). Phosphate and borate buffers may be made, e.g., by dissolving the sodium
borate and sodium phosphate in sterile water for injection (WFI) and ing the pH of each
solution to meet pre-established requirements. The chitosan used may be in the form of
chitosan salt (e.g. chitosan chloride, chitosan glutamate, chitosan acetate or other salt forms
of chitosan). The chitosan salt powder may be mixed (or pre-mixed, depending on the
ment) with the PEG-ester or PEG-amine powder in predetermined amounts. The
powders may then be dissolved in their respective buffer solutions, e.g. in one vial the PEG-
ester and chitosan in the phosphate buffer solution, and in the other vial PEG-amine in the
borate buffer solution. Alternatively, the chitosan powder can be mixed with the PEG-amine
in the borate buffer solution. Still alternatively, the chitosan powder can be mixed and
dissolved in each of the vials, e.g., with both PEG-amine and PEG-ester, and then later
combined. The molar ratio of the PEG-ester to PEG-amine may be such that the PEG-ester
groups are in excess of PEG-amine so that PEG-ester groups are available to react with the
16704496_1 (GHMatters) P104634.NZ 26/10/2020
amine groups of the chitosan r chains to create covalent bonding n the PEG
and the an polymer chains. Additional information on the ratio of the various PEG
precursors is disclosed in more detail above. These precursor solutions may be mixed
er, poured into trays, and freeze-dried. The freeze-dried material may optionally be
subjected to a series of heat and/or humidity ioning cycles, e.g., to complete the
polymerization reaction.
In several embodiments, the freeze-dried and conditioned sheet of
hydrogel sealant may then be trimmed according to size and mass requirements, e.g., cut to a
desired length for the finished first section 4. For example, as shown in , the
d hydrogel may be dried, , and loaded into a transfer tube 8 for uent
attachment to the second section 6.
To ate the non-freeze-dried, non-cross-linked distal section 6 of the
sealant 2, PEG-amine and PEG-ester powders (or other cross-linkable polymer precursors)
may be melted in an appropriate vessel (e.g., a beaker or flask), mixed, and heated at a predetermined
temperature and for a duration sufficient to fully melt and uniformly mix the
mixture. One of ordinary skill in the art will appreciate that the melting point of the various
precursors will depend, at least in part on their molecular weight. However, one of ordinary
skill in the art will readily be able to, based on the disclosure provided herein, prepare the
precursors riately to generate the co-polymer sealants. In another embodiment the
non-freeze dried section may additionally n chitosan fibers, a an mesh or chitosan
particles incorporated in the melted section. For example, the precursors may be melted in a
substantially dry air or inert gas environment, e.g., a vacuum chamber. This approach can
reduce entrapment of moisture, which may otherwise cause premature degradation and
crosslinking. Using a vacuum generator, the melted PEG, which may or may not comprise
chitosan fibers, chitosan mesh or chitosan particles, may then be applied onto the distal end
4b of the rolled freeze-dried first section 4.
For example, as described above, the first section 4 may be formed from a
rolled sheet and loaded into a transfer tube 8, as shown in . The transfer tube 8 may
have an inner diameter or other section corresponding to the desired outer diameter or
cross-section for the finished sealant 2. The transfer tube 8 may be formed from any material
sufficient to handle the processing parameters of the assembly process, such as polymers,
metals, or composite materials, and may optionally include desired coatings, e.g., PTFE to
facilitate insertion of the first section 4 and/or removal of the sealant 2.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
The first section 4 may be loaded into the transfer tube 8 such that the
distal end 4b of the first section 4 is offset inwardly a predetermined distance L6 from the end
of the transfer tube 8, e.g., corresponding to or greater than the desired length of the second
section 6. For example, for a desired finished length of the second n 6 of about 1.5
millimeters, the distal end 4b may be offset inwardly about two millimeters (2.0 mm) from
the end of the transfer tube 8 (with any excess material may trimmed off later, as described
below). Using the vacuum generator, the melted oss-linked PEG, which may or may
not comprise chitosan fibers, chitosan mesh or an particles, is then applied onto the
distal end 4b of the rolled freeze-dried sealant, e.g., the vacuum directing the melted PEG
into the transfer tube 8 and against the distal end 4b of the first section 4 (as represented by
the arrow labeled “vacuum”). Thus, the transfer tube 8 may mold the melted PEG into the
desired shape, e.g., diameter and/or length, for the second section 6.
The vacuum may cause the melted precursors to nominally abut the distal
end 4b of the first section 4, and/or may partially draw the melted precursors into the pores
and/or other open spaces within the first section 4, e.g., due to capillary action and the like.
In this situation, a transition zone 7 may be created within the distal end 4b of the first section
4 in which the melted precursors permeate the -dried hydrogel or other material of the
first section 4, which may enhance fusing the second section 6 to the first section 4. For
example, the melted precursors may quickly cool under ambient conditions such that the
penetration into the distal end 4b may be relatively short, e.g., resulting in a tion zone 7
of less than a few millimeters (mm) (e.g., less than about five mm, less than about 4 mm, less
than about 3 mm, less than about 2mm, less than about one millimeter, or less).
The melted precursors may be dried under ambient conditions, e.g., simply
allowed to cool and solidify, or alternatively, the melted and applied sors may be
exposed to desired conditions to accelerate or facilitate solidification of the melted
precursors. The vacuum process ively fuses the two sections together to provide a
length of sealant 2.
Chitosan fibers may be manufactured by the technique of fiber spinning
from solutions of chitosan in volatile ts (e.g., electrospinning). A chitosan mesh may
be manufactured by freeze drying a on of high tration of an. Alternatively
chitosan may be cross-linked by a variety of linkers to create highly cross-linked
an polymer chains which may further be processed to manufacture chitosan fibers or a
mesh. While in some embodiments, chemical cross-linking agents can be used (e.g.,
16704496_1 (GHMatters) P104634.NZ 26/10/2020
gluteraldehdye, formaldehyde), in several embodiments, natural cross-linkers such as n
are used. Electrospinning methods can also be used to manufacture cross-linked chitosan
fibers (e.g., fibrous mats or meshes). Vapor cross-linking may also be used, in several
embodiments.
As discussed above, various ratios of PEG and chitosan can be used to
e a final freeze dried el that has high swelling capacity upon contact with
physiological fluids as well as hemostatic properties. In several embodiments, two PEG
precursors are combined with chitosan. In certain such embodiments, one PEG precursor
contains ester end groups and one ns amine end groups. The PEG precursors can react
with chitosan (the PEG ester can react with the amine groups of chitosan) and with each other
(PEG-ester reacts with PEG-amine) and can provide a partially cross-linked network that
upon freeze drying can result in a highly porous hydrogel material.
The ratio of PEG-ester to PEG-amine precursors as well as the ratio of the
PEG precursors to the chitosan can alter final properties of the freeze dried hydrogel. As
discussed above, the weight ratio of chitosan in the final hydrogel ation can be
between about 0.1 and about 30% wt, though in several embodiments, the weight ratio of
chitosan in the final hydrogel ation is between about 1% and about 10%. In one
embodiment, the first section comprises between about 2% and about 4% (by weight)
chitosan. In still additional embodiments, the final freeze dried hydrogel contains between
about 4% and about 6% by weight of chitosan. The ratio of the PEG precursor that has ester
active groups with regards to the PEG precursor that has amine end groups can impact the
crosslinking density, porosity and integrity of the freeze dried polymer network. In some
embodiments, the PEG-ester is in excess of the PEG-amine in order for some ester groups to
be able to ntly react with the amine groups of the chitosan. These resulting els
contain an within their polymer network where an is covalently bonded to the
PEG components. This method increases the swelling capacity of the final freeze dried
hydrogel material as well as the hemostatic y by increasing the total e area of the
hydrogel material.
As shown in , a chitosan bioabsorbable mesh 6a’ may be
embedded within and/or surround the precursors 6b’ of a second section 6’. The mesh 6a’ of
bioabsorbable chitosan may have greater rigidity, elasticity, and/or other desired properties
than the solidified precursors 6b.’ In on, as shown, the mesh 6a’ may include one or
more fibers or filaments having a helical configuration (one l filament shown), or
16704496_1 (GHMatters) P104634.NZ 26/10/2020
alternatively the mesh 6a’ may include a braid of nts, a rolled porous mat, and the like
(not shown). In one embodiment, the mesh 6a’ may be embedded in the precursors 6b’ of the
second section 6,’ e.g., by inserting the reinforcement element(s) into the end of the transfer
tube 8 (not shown, see ) before applying the melted precursors (not shown), as
bed above. Thus, as the applied precursors are drawn into the transfer tube 8 and cool
(or are otherwise dried and/or solidified), the precursors 6b’ may permeate through and/or
surround the mesh 6a,’ y embedding the element(s) in the second section 6.’
As shown in , chitosan reinforcing particles or fillers 6a” may be
provided in a second section 6”. For example, compositions of chitosan may be mixed into
the melted precursor mixture, and then the reinforcing fillers 6a” may be applied to the distal
end 4b of the first section 4 (not shown) along with the precursors 6b,” e.g., using the vacuum
process described above. Thus, the filler material 6a” may be distributed ly,
ntially uniformly, or in a desired pattern throughout the second section 6,” y
enhancing the rigidity, reducing the brittleness, and/or otherwise modifying the properties of
the precursors 6b” of the second section 6” in a desired .
As discussed above, diluents may be included in the formulation in some
ments. In some such embodiments, the diluents are added to the formulation, (e.g.,
the melted sors) before application to the first section 4, so as to improve the
mechanical strength and/or integrity of the first section 6 and/or to minimize the brittleness of
the second section 6.
It will be appreciated that the shape of any of the sealants herein may be
modified to have a shape that is conducive to controlled deformation. Examples include an
inverted golf tee, an hourglass, swept or wavy surfaces, tubular or solid rod cross-sections or
shapes, elliptical, triangular, square, conical, disk, nal shapes, and the like (not shown).
As shown in Figure 1, the first section 4 and the second n 6 (or
alternatively section 6, if no first section 4 is included) may include a lumen 5 extending
between the proximal and distal ends 4a, 4b of the first section 4 and through the second
section 6, e.g., to facilitate delivery of the sealant 2. For example, the lumen 5 may be
ioned to accommodate receiving a balloon catheter or other positioning member
therethrough, e.g., such that the sealant 2 may slide relative to or pass over the positioning
member and/or the positioning member may be directed axially relative to the sealant.
Alternatively, the sealant 2 may be a substantially continuous rod of material, e.g., such that
16704496_1 (GHMatters) P104634.NZ 26/10/2020
the sealant 2 may be red into a puncture using a cartridge or shuttle without a
oning member.
In addition (or alternatively), if the sealant 2 includes a lumen 5, the lumen
may be created when the first section 4 is formed, e.g., if the first section 4 is rolled from
one or more sheets or layers of material or formed by molding. Alternatively, the lumen 5
may be formed by boring into or otherwise removing material from an y formed and
solid first section 4, second section 6, or through the entire sealant 2. For example, if the first
section 4 is formed from a rolled sheet, a rod or other mandrel 9 (which may be fabricated
similar to the transfer tube 8) may be inserted through the lumen 5 before the second section
6 is applied to the distal end 4b, e.g., that extends from the transfer tube 8, as shown in . Thus, the second section 6 may be molded and fused to distal end 4b around the l
9, e.g., within the transfer tube 8. The mandrel 8 may be removed once the melted precursors
have solidified, resulting in a continuous lumen through the second section 6 and the first
section 4. Alternatively, the n of the lumen 5 through the second section 6 may be
bored, drilled, or otherwise created after the second section 6 is formed and fused to the first
section 5.
The dimensions of the sealant can be tailored to the specific ation
(e.g., larger width and/or longer to seal larger punctures, or smaller/shorter for smaller
punctures). In l embodiments, the t 2 has an overall length between about three
and twenty millimeters (3-20 mm), including between about 3 and about 5 mm, between
about 5 and about 7 mm, between about 7 and about 9 mm, between about 9 and about 11
mm, between about 11 and about 13 mm, between about 13 and about 15 mm, between about
and about 15.5 mm, between about 15.5 and about 16 mm, between about 16 and about
16.5 mm, between about 16.5 and about 17 mm, between about 17 and about 20 mm, or any
length therebetween. Shorter or longer sealants may also be used, as is needed for specific
sealing applications.
The second portion 6 of the sealant can be any percentage of the total
length of the sealant. For example, while the non ing embodiment shown in
depicts a sealant with the first section 4 being substantially longer than the second section 6,
it will be appreciated that, alternatively, the sections 4, 6 may have similar lengths, or the
second n 6 may be longer than the first section 4. In a further alternative ment,
the first section 4 may be omitted, and the second section 6 may provide the entire length of
16704496_1 (GHMatters) P104634.NZ 26/10/2020
the sealant 2 (not shown), e.g., having a length between about three and twenty millimeters
(3-20 mm).
For e, the first section 4 may have a length between about zero (if
the sealant 2 is formed entirely from the second section 6) and twenty eters (0-20 mm),
e.g., between about five and twenty millimeters (5-20 mm), e.g., about fifteen millimeters (15
mm). The second section 6 may have an outer diameter similar to the first n 4, but may
have a length that is ntially shorter, e.g., between about zero (if the sealant 2 is formed
entirely from the first section 4) and eight millimeters (0-8 mm), e.g., between about half and
five millimeters (0.5-5.0 mm), e.g., about 1.5 millimeters.
ing on the application the, outer diameter (or other cross-sectional
dimension) of the sealant is between about one and about eight millimeters, including
between about 1 mm to about 3 mm, about 3 mm to about 5 mm, about 5 to about 8 mm, and
any diameter or dimension between those listed. For example, in several embodiments, the
l dimension of the t is between about 1 and about 3 mm, ing between about
1 mm and about 1.25 mm, between about 1.25 mm and about 1.5 mm, between about 1.5 mm
and about 1.75 mm, between about 1.75 mm and about 2 mm, between about 2 mm and about
2.5 mm, between about 2.5 mm and about 3 mm, and any dimension between those listed.
Sealants with larger or smaller lateral dimensions may also be used.
Devices for t Deployment
Turning to FIGS. 3A-3D, an apparatus 710 is shown that generally
includes a positioning member 714 and a cartridge 716 d on the positioning member
714 for delivering a sealant 2 therein into a puncture (not shown). The cartridge 716 can
include a sealant sleeve 750 carrying sealant 2 therein (which can include any of the sealant
features described herein), and surrounding a distal end 734 of a support member 730
adjacent the sealant 2, and a handle or hub 723 on the proximal end 732 of the support
member 730. The t sleeve 750 can include a relatively large diameter proximal portion
752 surrounding a portion of the distal end 734 of the support member 730, e.g., sized to abut
or otherwise contact a hub or proximal end 783 of an introducer sheath 780, such as that
shown in , and a relatively small diameter distal portion 754 surrounding the sealant
2, e.g., sized to enter the hub 783 and/or lumen 786 of the introducer sheath 780. The hub
783 can include a cavity adapted to releasably receive the small diameter portion of the
sealant sleeve. The cartridge 716 can be initially ed such that the sealant sleeve 750
16704496_1 (GHMatters) P104634.NZ 26/10/2020
and t 2 are located immediately adjacent a positioning element 746 of the positioning
member 714.
The handle 723 can include an outer housing or shroud 772 surrounding an
inner housing or frame 774 and one or more actuators 760-764 for allowing and/or causing
movement of one or more components of the apparatus 710 relative to one another, as
described further below. As shown, the outer housing 772 can include a first opening or slot
773 within which first and second actuators 760 and 762 are provided, and a second slot 775
within which third actuator 764 is provided. The opening 773 may e one or more
features for interacting with first and/or second actuators 760, 762, as described further
below.
The inner housing 774 may be slidable axially relative the outer housing
772, e.g., between an initial, proximal position and a distal position. For example, the outer
housing 772 may include clam-shell halves or other components that may be attached around
the inner housing 774 such that cooperating rails and grooves (not shown) allow the inner
housing 774 to slide y without substantial lateral motion. In an exemplary embodiment,
one or more elongate ribs or rails (not shown) may be molded or otherwise ed on the
inner surfaces of the outer housing 772 that may be slidably received n rails or
grooves (also not shown) in the inner housing 774.
The handle 723 can include a distal shroud 776 integrally formed with or
otherwise ing from the outer g 772. One or more detents or other features, e.g.,
a pair of tines 778, may be provided on the shroud 776 for engaging the hub 723 to an
introducer , such as the sheath 780 shown in . For e, the sheath 780
may e a hub 783 that includes a pair of pockets 783a that extend axially along opposite
sides of the hub 783. The tines 778 include tabs or detents 778a that may be slidably
received within the pockets 783a, e.g., when the apparatus 710 is introduced into the sheath
780 during use, as bed below. The relative length of the tines 778 and pockets 783a are
configured such that the detents 783a pass through the pockets 783a and extend out the distal
ends thereof. The detents 783a may include ramped or tapered distal edges that facilitate
insertion, and blunt proximal edges that may engage distal ends of the pockets 783a to
prevent the tines 778 from being withdrawn back h the pockets 783a, thereby coupling
movement of the sheath 780 and outer housing 772 of the hub 723, also as described further
below.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
As can be seen in , the apparatus 710 can include a rack and pinion
arrangement. For e, as shown, a rack 766 may be coupled to a proximal end 732 of
the support member 730 and slidably received within the outer and/or inner housings 772,
774. A pinion 768 may be rotatably mounted to the inner housing 774 that is coupled to the
rack 766 by a plurality of interlocking teeth 766a, 768a. The second or support actuator 762,
e.g., a button pivotably coupled to the inner housing 774, is coupled to the pinion 768, e.g.,
by ocking teeth 762b, 768b, for selectively rotating the pinion 768. For e, as
bed further below, the second actuator 762 may be depressed to cause the pinion 768 to
rotate, thereby causing the rack 766 to advance distally, thereby advancing the support
member 730.
Optionally, as shown, a first or locking actuator 760 may be provided on
the hub 723 for preventing relative movement of the outer and inner/or housings 772, 774
until activated and/or limiting movement of the support member 730. For e, as best
seen in , the locking actuator 760 may be pivotably mounted to the inner housing 774
and e a distal end 760a that abuts or otherwise s a distal edge 773b of the
opening 773 in the outer housing 772. As a , the inner housing 774 may be
substantially secured in the proximal position and cannot be directed towards the distal
position until the locking actuator 760 is activated to disengage the distal end 760a of the
actuator 760 from the distal edge 773b of the g 773.
In addition or alternatively, the first actuator 760 may include a detent or
other locking feature 760b for selectively g the support member 730 relative to the
inner housing 774. For example, as shown in , a detent 760b extends inwardly from
the first actuator 760 that is not engaged with any other features. When the first actuator 760
is ted, i.e., directed inwardly to disengage the distal end 760a of the actuator 760 from
the distal edge 773b of the outer housing 772, the detent 760b may drop downwardly into the
inner housing 774. As discussed herein, once the inner and outer housing portions 774, 772
are movable relative to one another, the handle 723 can be moved proximally causing the
outer sheath 780 to retract and uncover the sealant.
Subsequently, when the support or 762 is subsequently activated, the
rack 766 may advance, causing the support member 730 to tamp the sealant toward the
arteriotomy, as described herein, until a distal end 766b of the rack 766 passes under the
detent 760b and the detent 760b is captured in a pocket (not shown) therein. With detent
16704496_1 (GHMatters) P104634.NZ 26/10/2020
760b captured in the , the rack 766 cannot be directed proximally, y ting
proximal movement of the support member 730 coupled to the rack 766.
The apparatus 710 may also include a third or balloon retraction actuator
764, e.g., for selectively retracting the positioning element 746 through the sealant 2 after
deployment. For example, as shown in , the third actuator 764 may be slidably
mounted to the inner housing 774 and may be selectively coupled to the hub 748 of the
positioning member 714.
Initially, the third actuator 764 may be coupled with the inner housing 774
but may be decoupled from the inner g 774 once the sealant 2 has been ed
and/or tamped. For example, as best seen in , the third actuator 764 may include a
third arm 764c that may be decoupled from the inner housing 774 such that proximal
movement of the third actuator 764 relative to the outer and/or inner housings 772, 774
causes similar proximal movement of the hub 748, thereby directing the positioning element
746 proximally.
In addition, the third actuator 764 can e a second arm 764b that may
be slidably positioned adjacent a proximal end 766c of the rack 766. With the second arm
764b positioned in this manner, the third arm 764c may remain coupled with the hub 748.
When the rack 766 is directed distally, e.g., by activating the second actuator 762, the second
arm 764b may slide off the proximal end 766c of the rack 766, thereby decoupling the third
arm 764c from the inner g 774. For example, as shown, a spring or other biasing
mechanism 764a may be provided on the third actuator 764 (or optionally, the outer housing
772) for biasing the second arm 764b outwardly when the rack 766 is directed ly to
clear the second arm 764b from the proximal end 766c of the rack 766. In addition, the
spring or biasing ism 764a may require that the actuator be depressed in order to
le the third arm 764c from the inner housing thereby preventing inadvertent movement
of the positioning element 746. Thereafter, the third actuator 764 may be directed proximally
to retract the hub 748 and the positioning element 746.
The apparatus 710 may be used to deliver the sealant 2 into a re,
e.g., communicating with a body lumen within a patient’s body. Initially, the introducer
sheath 780 shown in may be positioned through the puncture into the body lumen.
Optionally, the introducer sheath 780 may be ed as part of an
ucer kit, e.g., including a dilator 790 and a guidewire 799, and/or a system also
including the apparatus 710. The dilator 790 may include a proximal end 792 and a distal
16704496_1 (GHMatters) P104634.NZ 26/10/2020
end 794 sized to be slidably received through the lumen 786 of the introducer sheath 780,
e.g., terminating a d, atic and/or other distal tip to facilitate introduction of the
dilator 790 and introducer sheath 780 into a puncture (not shown), e.g., over the guidewire
799. As shown, the dilator 790 can include a proximal housing 796 include tines 798 and
detents 798a configured similar to the distal shroud 776 of the apparatus 710. The dilator 790
may be directed into the hub 783 and lumen 786 of the introducer sheath 780 until the tines
798 enter and the detents 798a exit the passages 783a in the hub 783.
Thus, the dilator 790 and ucer sheath 780 may be coupled together
such that the guidewire 799 (already placed through a puncture into a body lumen, not
shown, as described elsewhere herein) may be backloaded into the distal end 794 and lumen
796 of the dilator 790 to uce the dilator 790 and introducer sheath 780 into the
puncture. Once the introducer sheath 780 is positioned as desired, the tines 798 may be
ed inwardly to disengage the s 798a from the pockets 783a and allow the dilator
790 to be withdrawn from the lumen 796 of the introducer sheath 790. The introducer sheath
780 may then be used to access the body lumen and perform one or more procedures, as
described elsewhere herein.
When it is desired to seal the puncture, any instruments introduced through
the introducer sheath 780 may be removed and the apparatus 710 may be prepared, e.g., as
shown in FIGS. 3A and 3B. With the positioning element 746 collapsed, the distal end 744
of the positioning member 714 may be directed into the hub 783 of the introducer sheath 780,
through the lumen 786, and into the body lumen. Because the sealant sleeve 750 and sealant
2 are located ately adjacent the oning element 746, as the distal end 744 enters
the introducer sheath 780, the sleeve 750 may contact the introducer sheath 780, which may
prevent further advancement of the sleeve 750. For example, the distal n 754 of the
sleeve 750 may at least partially enter the hub 783 of the introducer sheath 780 and the
proximal portion 752 of the sleeve 750 may abut the hub 783, thereby preventing further
advancement of the sleeve 750. If the sleeve 450 is releasably attached to the support
member 730, advancement of the positioning member 714 may e the sleeve 750 from
the distal end 734 of the support member 730.
The positioning member 714 may be advanced further into the introducer
sheath 780, whereupon the sleeve 750 may remain substantially stationary relative to the
introducer sheath 780 and, consequently, slide proximally over the support member 730.
Thus, the distal end 734 of the support member 730 may exit the distal n 754 of the
16704496_1 (GHMatters) P104634.NZ 26/10/2020
sleeve 750 and enter the introducer sheath lumen 786, thereby ejecting the sealant 2 from the
sleeve 750 and into the sheath lumen 786. Optionally, the distal portion 754 of the sleeve
750 may have sufficient length and/or other features to at least partially open the valve(s) (not
shown) within the introducer sheath hub 783, e.g., to facilitate the sealant 2 and distal end
734 of the support member 730 being advanced into the introducer sheath lumen 786. Thus,
the sleeve 750 may protect the sealant 2 until the sealant 2 passes through the hub 783 and
any valves therein, into the lumen 786 of the introducer sheath 780.
The positioning member 714 may then be advanced until the positioning
element 746 is ed beyond the distal end 784 of the introducer sheath 780, i.e., within
the body lumen. As this , the tines 778 on the housing shroud 776 may be aligned with
and enter the pockets 783a on the sheath hub 783, e.g., until the detents 778a engage the
distal ends of the pockets 783a, as described above. With the detents 778a engaged with the
pockets 783a, the introducer sheath 780 and outer housing 772 may be coupled together such
that they move together.
The relative length of the positioning member 714 and the ucer
sheath 780 may be configured such that the sealant 2 remains within the sheath lumen 786,
e.g., proximal to the distal end 784 of the introducer sheath 780, while the oning
element 746 is d beyond the distal end 784. The positioning element 746 may then be
expanded, e.g., by inflating the positioning element 746 using fluid from the syringe 148.
The entire apparatus 710 and introducer sheath 780 may then be retracted (regardless of
whether the apparatus hub 723 or the sheath hub 783 is manipulated) until the expanded
positioning element 746 contacts the wall of the body lumen adjacent the puncture.
Once properly positioned, the first actuator 760 may be activated to
decouple movement of the outer and inner members 772, 774. For e, while holding
the outer g 772, the first actuator 760 may be pressed inwardly to disengage the distal
end 760a of the first actuator 760 from the distal end 773b of the outer housing 772, and then
the outer g 772 may be retracted proximally, i.e., away from the patient and puncture.
With the inner housing 774 coupled to the positioning member 714 and support member 730,
this action causes the inner housing 774 to slide within the outer g 772, i.e., from the
proximal position (shown in FIGS. 3A-3C) to the distal position, thereby ting the
introducer sheath 780 relative to the support member 730 and exposing the sealant 2 within
the puncture adjacent the positioning element 746.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
With the inner housing 774 in the distal position, the second actuator 762
may be activated to advance the support member 730, e.g., to tamp or compress the sealant 2
against the expanded positioning element 746 and/or outer wall of the body lumen, e.g., over
an arteriotomy. For e, with particular reference to , the second actuator 762
may be pressed inwardly, thereby rotating the pinion 768, advancing the rack 766, and
consequently advancing the support member 730 to direct the distal end 734 towards the
positioning element 746 and compress the sealant 2 therebetween.
Optionally, the second actuator 762 may e one or more features, e.g.,
tabs or detents 762a that may be engaged with the outer housing 772 when the second
or 762 is fully depressed. For example, as shown in FIGS. 3A and 3B, the opening 773
in the outer housing 772 may include one or more pockets or recesses 773a that may be
d with the tabs 762a on the second actuator 762 when the inner housing 774 has been
directed fully to the distal position. With the tabs 762a received within the pockets 773a, the
inner housing 774 cannot be moved proximally relative to the outer housing 772, thereby
securing the outer and inner housings 772, 774 relative to one another.
Once the sealant 2 has been exposed for sufficient time and/or tamped by
the support member 730, the positioning element 746 may be collapsed, and the positioning
member 714 withdrawn from the body lumen, e.g., pulling the sed positioning element
746 through the sealant 2 and support member 730. For example, the positioning element
746 may be deflated using the syringe 148, and then the third actuator 764 may be activated
to withdraw the collapsed oning element 746 through the t 2 and into the distal
end 734 of the support member 730.
Optionally, as described above, the third actuator 764 may remain coupled
with the inner housing 774 until the rack 766 is advanced sufficiently to release the third arm
764c of the third actuator. fter, proximal nt of the third actuator 764 relative
to the outer and inner housings 772, 774 causes the hub 748 and the entire oning
member 714 to also move proximally, thereby withdrawing the positioning element 746
through the sealant 2 into the distal end 734 of the support member 730. The length of the
slot 775 in the outer housing 772 may be configured to withdrawn the positioning element
746 a desired distance into the distal end 734.
Once the positioning element 746 is withdrawn through the t 2, the
entire apparatus 710 may be withdrawn to remove the support member 730 from the
puncture, g the sealant 2 within the puncture.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
FIGS. 4A-4F schematically illustrate a method of ring a sealant from
another apparatus 810 to an arteriotomy site. The apparatus 810 can include any of the
features described in connection with the tus 710. For example, the apparatus 810 can
e a t 2 positioned at a distal portion of a positioning assembly 814. The
positioning assembly 814 extends through the puncture and into the vessel, such that the
positioning element 856 is within the vessel lumen and the sealant 2 is outside the vessel wall
(). Expanding the positioning element 846 secures the apparatus 810 relative to the
arteriotomy site (). Withdrawing a sheath 880 exposes the sealant 2 to the
arteriotomy site (), and advancing a support member 830 tamps the sealant 2 (). After the positioning element 846 deflates (), the positioning element 846 can
move proximally through the sealant 2 (), leaving the sealant 2 outside the vessel.
The support member 830 can maintain the position of the sealant 2, while the positioning
element 846 is withdrawn. After the positioning element 846 is withdrawn, the entire
apparatus 810, including the sheath 880 and the oning assembly 814 can be awn
from the patient. The apparatus 810 and methods of using the apparatus 810 are described in
detail below.
As shown in FIGS. 4A through 4F, the apparatus 810 can include a handle
823. The handle 823 can include an outer housing 872 and an inner housing 874. The outer
housing 872 can move relative to the inner housing 874, for example, when the sheath 880
moves proximally relative to the positioning assembly 814.
The handle 823 can e one or more ors for controlling the
apparatus 810. Each actuator can control one or more functions of the apparatus 810. The
one or more ors can be positioned anywhere along the handle 823. In FIGS. 4A
through 4F, the actuators 860, 862, 864, and 848 are oned along the handle 823 based
on the procedural step each actuator controls. The configuration of actuators shown in FIGS.
4A through 4F reduces confusion associated with operating the apparatus 810 by only
requiring the user to move his/her hand proximally for each subsequent step of the procedure.
Although FIGS. 4A through 4E illustrate four actuators 860, 862, 864, and 848, fewer or
additional actuators may be used to perform the same ons.
The apparatus 810 can e the inflation line 48c. The ion line
48c is in fluid communication with the positioning element 846. The inflation line 48c
connects to the syringe 148 or other device for delivering fluid to the positioning element
846.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
The apparatus 810 can include a first actuator 860 to control fluid flow
through the inflation line 48c. The first actuator 860 moves between an open position and a
closed position. As shown in , when the first actuator 860 is in the open position, the
syringe 148 can deliver a fluid h the inflation line 48c to expand the positioning
element 846. In , the first actuator 860 moves to the closed position and restricts
fluid flow through the inflation line 48c to maintain the expanded state of the positioning
element 846. After the positioning element 846 expands, the apparatus 810 moves
proximally so the positioning element 846 is adjacent to the arteriotomy.
The apparatus 810 can include a second actuator 862 to control movement
of the sheath 880 relative to the positioning assembly 814. The second or 862 moves
n a first position and a second position. In the first position (FIGS. 4A and 4B), the
sheath 880 cannot move relative to the positioning assembly 814, thus preventing inadvertent
exposure of the sealant 2. Moving the second actuator 862 from the first position to the
second position, as shown in , permits the sheath 880 to move relative to the
positioning assembly 814. Retracting the sheath 880 exposes the sealant 2 to the arteriotomy
site, while the positioning assembly 814 remains stationary. Retracting the sheath 880 can
also cause a portion of the outer housing 872 to at least partially cover the second actuator
862.
The apparatus 810 can include a g mechanism to prevent the inner
housing 874 from moving relative to the outer housing 872. As the sheath 880 retracts, the
outer housing 872 moves between a first position and a second position. When the outer
housing 872 is in the first position (FIGS. 4A and 4B), the inner housing 874 can move
relative to the outer housing 872. When the outer housing 872 is in the second on (), the inner housing 874 is unable to move proximally relative to the outer housing 872.
As shown by FIGS. 4C and 4D, the tus 810 can e a third
actuator 864. The third actuator 864 moves n a first position and a second position.
Moving the third actuator 864 from the first on to the second position advances the
support member 830 to tamp the sealant 2. g the sealant 2 can prevent substantial
movement of the sealant 2 and facilitate hemostasis.
Moving the third actuator 864 from the first position to the second position
can release a retraction lock 816. The retraction lock 816 prevents the oning assembly
814 from inadvertently ting prior to tamping the sealant 2. Releasing the tion lock
96_1 (GHMatters) P104634.NZ 26/10/2020
816 permits at least a portion of the positioning assembly 814 to move ally relative to
the t member 830.
The apparatus can include a fourth actuator 848 capable of moving
between a first position and a second position. Unlocking the retracting lock 816 s
movement of the fourth or 848. Moving the fourth actuator 848 from the first position
to the second position retracts at least a portion the positioning assembly 814 relative to the
support member 830.
In , the first actuator 860 moves to the open position to permit
fluid flow h the inflation line 48c. When the first actuator 860 is in the open position,
the syringe 148 can deflate the positioning element 846. In , the positioning member
814 is retracted h the sealant 2, so the entire apparatus 810 can be removed from the
patient.
As described above, the tus 810 can include an actuation
mechanism to control fluid flow to the positioning element 846. The actuation mechanism
can include any of the features described below in connection with FIGS. 5A-7B, alone or in
combination with each other.
FIGS. 5A and 5B depict the first actuator 860a moving between the
opening position and the closed position. FIGS. 5A-1 and 5B-1 rate a cross-sectional
view of the inflation line 48a. The outer housing 872a of the handle includes an opening
through which a portion of the first actuator 860a extends. In FIGS. 5A and 5B, the first
actuator 860a is a valve, but the first or 860a and the valve can also be separate
components. The valve can e a pinch mechanism to restrict fluid flow h the
inflation line 48a.
The first actuator 860a can move between the open position () and
the closed position (). In the open position, fluid can flow through inflation line 48a.
In the closed configuration, fluid cannot flow through the inflation line 48a. gh FIGS.
5A and 5B depict the first actuator 860a as a rocker, the first actuator 860a can take on other
shapes.
FIGS. 6A and 6B depict an apparatus having the first actuator 860b and a
deflation actuator 866b. FIGS. 6A-1 and 6B-1 illustrate cross-sectional views of the inflation
line 48b. A linkage portion 867b connects the first actuator 860b to the deflation actuator
866b. Although the linkage portion 867b shown in FIGS. 6A and 6B includes multiple link
members, the linkage portion 867b may only include one link member (see FIGS. 6E-6F).
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The outer housing 872b includes two openings through which a portion of the first actuator
860b and the deflation actuator 866b extend.
Similar to FIGS. 5A and 5B, the first actuator 860b can move from a first
on to a second position to restrict fluid flow through the inflation line 48b. Moving the
first actuator 860b from the first position to the second on causes the deflation actuator
866b to move from a first position to a second position. Moving the deflation actuator 866b
from the second position to the first position causes the first or 860b to move from the
second position to the open position to permit fluid flow through the inflation line 48b.
Similar to FIGS. 6A and 6B, FIGS. 6C and 6D, can include a first actuator
860c and a deflation actuator 866c connected by linkage n 867c. The linkage n
867c can include one or more link members. Unlike FIGS. 6A and 6B, the first actuator 860c
and the deflation actuator 866c are ent from the valve 884c. For example, the valve
884c can be positioned distal to the first actuator 860c and the deflation actuator 866c.
The first actuator 860c can move from a first position to a second position
to close the valve 884c and ct fluid flow through the inflation line. Moving the first
actuator 860c from the first position to the second position causes the deflation actuator 866c
to move from a first position to a second position. Moving the deflation actuator from the
second position to the first position causes the first actuator 860c to move from the second
position to the first on and open the valve 884c.
Similar to FIGS. 6A-D, FIGS. 6E and 6F can include a first actuator 860d
and a deflation actuator 866d connected by e portion 867d. Unlike FIGS. 6A and 6B,
the linkage portion 867d only includes one link member. In addition, similar to FIGS. 6C
and 6D, the first actuator 860d and the deflation actuator 866d are ent from the valve
884d. For example, the valve 884d can be positioned distal to the first actuator 860d and the
deflation actuator 866d.
The first actuator 860d can move from a first position to a second position
to close the valve 884d and restrict fluid flow through the inflation line. Moving the first
actuator 860d from the first position to the second position causes the ion actuator 866d
to move from a first position to a second position. Moving the deflation actuator from the
second position to the first position causes the first actuator 860d to move from the second
position to the first position and open the valve 884d.
The apparatus having the first actuator and the deflation or may be
useful to minimize confusion associated with operating the tus. For example, if the
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apparatus includes additional actuators to control steps performed between inflating and
deflating the positioning element, the additional actuators can be positioned along the handle
between the first actuator and the deflation actuator. The actuators can be positioned based
on the procedural step each or controls, such that the user can move his/her hand
proximally for each subsequent step of the procedure. The deflation actuator may be
oned proximally of the additional actuators because deflating the positioning element is
the final step before withdrawing the tus.
As described above, the first actuator and the valve can be separate
components. As shown in FIGS. 7A-B, the first actuator 960 moves between a first position
and a second position to control the position of the valve 961. Moving the first actuator 960
from the first position () to the second position () moves the valve 961 from
an open position to a closed position. In the closed position, the valve 961 cts fluid flow
h the inflation line 948. FIGS. 7A-1 and 7A-2 rate cross sectional views of the
inflation line 948 moving from an open configuration to a closed configuration. Moving the
first actuator 960 from the second position to the first position moves the valve 961 from the
closed position to the open position, thus permitting fluid to flow through the ion line
948.
The first actuator 960 can be a lever. A pin connects the first actuator 960
to the valve 961. The valve 961 can be a g valve having a pinch mechanism to restrict
fluid flow through the inflation line 948. Moving the first actuator 960 between the first
position and the second position slides the valve 961 linearly between the open position and
the closed position. Although FIGS. 7A-B depict the first actuator 960 as a lever, the
apparatus can include any other mechanism capable of moving the valve 961, such as a rack
and pinion arrangement, a cam mechanism, or any other actuator.
The apparatus 810 can include the second actuator 862 to control
movement of the sheath 880 relative to the positioning assembly 814. The outer housing 872
can include an opening h which at least a portion of the second actuator 862 extends.
As shown in FIGS. 8A and 8B, the second actuator 862 can be a spring-actuated button.
The second actuator 862a moves between a first on () and a
second position (). When the second actuator 862a is in the first position, the second
or 862a prevents proximal movement of the sheath relative to the positioning assembly.
When the second actuator 862a is in the second position, the sheath can move proximally
relative to the positioning assembly. As the sheath moves proximally, the outer housing 872a
16704496_1 ters) P104634.NZ 26/10/2020
prevents the second actuator 862a from moving to the first on. Although the second
actuator 862a illustrated in FIGS. 8A and 8B includes a spring mechanism 868a, any other
locking mechanism described herein can be used to control movement of the sheath relative
to the positioning assembly.
As shown in FIGS. 9A and 9B, the second actuator 862b can include a
detent 869b. When the second actuator 862b is in the first position (), the sheath
cannot move relative to the positioning ly. When the second actuator 862b is in the
second position (), the detent 869b locks the second actuator 862b in a depressed
position, thus permitting the sheath to move proximally relative to the positioning assembly.
As the sheath moves proximally, the outer housing 872b moves over the second actuator
862b and keeps the second or 862b depressed.
The apparatus 810 can also include a mechanism to restrict the distance the
sheath 880 can move relative to the positioning assembly 814. For example, as shown in
FIGS. 8B and 8B, the sheath can only move until the distal end of the inner housing 874
abuts the distal end of the outer housing 872 or a different feature in the handle 823.
As described earlier, the handle 823 can include a locking mechanism to
lock the inner housing 874 relative to the outer housing 872. As shown in FIGS. 4A-4F, the
locking ism can include one or more protrusions 863 positioned along an inner wall
of the outer g 872 and one or more resilient members 875 positioned on the inner
housing 874. As the sheath 880 moves proximally, the one or more resilient members 875
flex inwardly and move past the one or more sions 863. After the one or more resilient
member 875 move past the one or more protrusions 863, the inner housing 874 is unable to
move proximally relative to the outer housing 872.
In FIGS 10A and 10B, the locking ism includes at least two
protrusions 863 along the inner wall of the outer housing 872 and at least two ent
members 875 positioned at a proximal end of the inner housing 874. The resilient members
875 are capable of flexing inward to move distally past the one or more protrusions 863. As
the sheath 880 is withdrawn, the resilient members 875 flex inward and move past the
sions 863. After the resilient members 875 move past the sions, the inner
housing 874 cannot move proximally ve to the outer housing 872.
Alternatively, the locking mechanism can include one or more protrusions
863 positioned on the inner housing 874 and one or more resilient members positioned along
16704496_1 (GHMatters) P104634.NZ 26/10/2020
the inner wall of the outer housing 872. Other locking mechanisms described herein can also
be used to lock the inner housing 874 relative to the outer g 872.
The apparatus 810 can include a mechanism to release the positioning
assembly 814 from the inner housing 874. Releasing the positioning assembly 814 permits
the positioning assembly 814 to move proximally while maintaining the position of the
t member 830. Alternatively, the apparatus 810 can include a mechanism to release
the inner housing from the outer housing.
FIGS. 11A through 11C illustrate a mechanism to prevent the support
member 830 from advancing prior to retracting the outer sheath 880. As shown in A,
g ism can be a tab 873 that prevents movement of the third actuator 864.
However, after the sheath 880 moves proximally (B), the tab 873 moves proximally
to enable movement of the third actuator 864 from a first on (B) to a second
position (C). Other locking mechanisms bed herein can also be used to prevent
the support member 830 from ing.
FIGS. 12A and 12B illustrate one mechanism for advancing the support
member 830. Moving the third actuator 864 from the first position to the second position
causes a e element 865 to extend and advance the support member 830. The support
member 830 can extend until a portion of the support member 830 abuts a feature of the
handle, such as the distal end of the inner housing 874 or the outer housing 872. The distance
the support member 830 can advance may also be limited by the distance the linkage element
865 can extend.
FIGS. 13A and 13B illustrate the apparatus 810 having a spring member
870. Moving the third actuator 864 from the first position to the second position causes the
spring member 870 to expand and e the support member 830 distally. The support
member 830 can extend until a portion of the support member 830 abuts a feature of the
handle, such as the distal end of the inner g 874 or the outer housing 872. The ce
the support member 830 can advance may also be limited by the distance the spring member
870 can expand. Other mechanisms can be used to advance the support member 830, such as
the rack and pinion arrangement described in connection with apparatus 710 or any other
actuator.
As described earlier, the apparatus 810 can include a retraction lock 816 to
lock the position of the positioning assembly 814 relative to the inner g 874. Moving
the third actuator 864 from the first position to the second position can release the retraction
16704496_1 (GHMatters) P104634.NZ 26/10/2020
lock 816 by moving a lever 817 from a first position to a second position. When the lever
817 is in the second position, the positioning assembly 814 can move relative to the outer
housing 872. Retracting the fourth actuator 848 of the positioning assembly 814 causes the
positioning assembly 814 to retract past the sealant 2. The support member 830 can retain
the position of the sealant 2 while the positioning ly 814 retracts. After the
positioning element 814 retracts, the entire apparatus 810 can be removed from the patient.
Other locking mechanisms described herein can also be used to lock the position of the
positioning assembly 814 relative to the inner housing 874.
FIGS. F schematically illustrate a method of delivering a sealant
similar to the method shown in FIGS. 4A-4F. However, as described earlier, the handle 823
does not have to include four actuators 860, 862, 864, and 848. For e, as shown in
FIGS. 15A-15F, the handle does not include the first actuator 860. Instead, the ion line
48c includes a valve 882. The valve 882 moves between a first position and a second
position. When the valve 882 is in the first position, as shown in A, fluid can flow
from the syringe to the positioning member 846. When the valve 882 moves from the first
position to the second position, as shown in B, fluid can no longer flow from the
syringe to the oning member 846.
FIGS. 16A-B illustrate an apparatus 1010 for delivering a sealant to an
arteriotomy site. The apparatus 1010 can include any of the features of the sealant delivering
apparatuses discussed herein. For example, the apparatus 1010 can include a positioning
assembly 1014 having a handle 1023 and a oning t 1046. At least a part of the
positioning assembly 1014 can extend through a sheath 1080. An inflation line 48c can
extend from the positioning t 1046 to a syringe 148 or any other mechanism for
inflating and deflating the positioning element 1046. The inflation line 48c can include a first
actuator 1082 for controlling fluid flow to the oning element 1046. The handle 1023
can include a second actuator 1062 to permit the sheath 1080 to retract relative to the
positioning element 1014, a third or 1064 to advance a t member (not shown),
and/or a fourth actuator 1048 for retracting at least a portion of the positioning assembly 1014
relative to the sheath 1080.
The sheath 1080 can include a mechanism to indicate when a distal portion
of the sheath enters a vessel. For example, the sheath 1080 can include one or more inlet
gs 1089 at a distal portion of the sheath 1080. As the sheath 1080 enters the vessel,
blood can flow into the gs 1080 and out of an outlet opening outside of the user.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
As shown in A, the sheath 1080 can also include a hub 1083 for
ng the handle 1023. For example, the hub 1083 can include one or more openings for
ng one or flanges of the handle, or vice versa. Depressing the sheath hub 1083 can
release the sheath 1080 from the positioning assembly 1014. The sheath hub can also e
a catch to engage the sealant sleeve (not shown). As the positioning ly 1014 enters
the sheath 1080, the sheath catch can engage the sealant sleeve to transfer the sealant from
the sealant sleeve to the sheath 1080.
The apparatus 1010 can also include an inflation indicator 1002. The
inflation indicator 1002 indicates when the positioning element 1046 is inflated to a predetermined
pressure and signals a user to seal the ion line 48c. As shown in B,
the inflation line connects to a plunger system 1004. As the positioning element 1046
inflates, the shaft member 1005 moves from a first position to a second position. As the shaft
member 1005 move to the second position, the indicator 1002 moves from a first position to a
second position. When the indicator 1002 is in the second position, the positioning element
1046 is fully inflated. As the positioning element 1046 deflates, the shaft member 1005
moves from the second position to the first position and the indicator 1002 moves from the
second position to the first on. When the indicator 1002 is in the first position, the
oning element 1046 is not fully inflated.
The indicator 1002 can include a first indicator 1003a and a second
tor 1003b. When the positioning element 1046 is not fully inflated, the first indicator
1003a can be seen through the opening 1006 of the handle 1023. When the positioning
element 1046 is fully inflated, the second indicator 1003b can be seen through the opening
1006 of the handle 1023.
Any of the sealant delivering apparatuses discussed herein can be a
component of a system including, but not d to, a guidewire or a dilator. The guidewire
can e any of the features described in connection with guidewire 799 described above.
The dilator can also e one or more of the features described in connection with the
dilator 790 described above and/or dilator 1190 (FIGS. 17A-17D) or dilator 1290 (FIGS.
18A-18C) described below.
As described shown in FIGS. 17A-18C, the dilator can contain a fluid
lumen that allows blood to flow from an inlet opening near the distal tip of the dilator to an
outlet opening near the proximal end of the dilator. Blood flow exits the proximal port when
96_1 (GHMatters) P104634.NZ 26/10/2020
the tip of the sheath enters the vessel. The sheath can then further advanced to ensure that the
distal tip of the sheath is in the vessel lumen.
As shown in FIGS. 17A-17D, the dilator 1190 includes an te
structure 1191 having a lumen ing therethrough. The dilator 1190 can also include a
proximal portion 1193 having a dilator hub 1196 for ng the sheath and/or a distal
portion 1192 having a tapered end. As shown in A, the dilator hub 1196 can be U-
shaped. The U-shaped dilator hub 1196 defines an opening for receiving a al end of
the sheath. The dilator hub 1196 can also include hub members 1197a, 1197b configured to
engage an outer surface of the sheath. The dilator hub 1196 can also include one or more
flanges to engage a corresponding feature of the sheath. For example, as shown in A,
the hub members 1197a, 1197b can include flanges 1198a, 1198b to and/or the hub 1196 can
include flanges 1199a, 1199b near a top surface of the dilator hub.
The dilator 1190 can also include a bleed back feature to help ine
when the distal portion 1192 of the dilator 1190 enters a vessel. For example, the dilator
1190 can include one or more inlet openings 1194 at a distal portion 1192 of the dilator 1190.
As shown in A, the dilator 1190 can include two inlet openings 1194. The inlet
openings 1194 can be positioned proximal to the tapered portion of the elongate ure
1191 and/or along the same plane transverse to the longitudinal axis of the dilator 1190. The
dilator 1190 can also e one or more outlet gs 1195 positioned proximal to the
dilator hub 1196. As shown in A, the dilator 1190 can include one outlet opening
1195. The outlet opening 1195 can be positioned along the same plane as one of the inlet
openings 1194. The dilator hub can include a direction feature 1197 for indicating the
direction the blood flow will exit. As shown in C, the direction feature 1197 can be
an arrow along a top surface of the dilator hub 1196.
The lumen extending through the elongate structure 1191 can have a
varying diameter. For example, the lumen can have a first diameter 1189 at the distal portion
1192 and proximal n 1193 of the elongate structure 1192 and a second diameter 1188
between the distal portion 1192 and proximal n 1193. The first er 1189 can be
less than the second diameter 1188. The first diameter 1189 can e a diameter that is
larger than the outer diameter of the guide wire and smaller than the second diameter 1188.
In some embodiments, the first diameter 1189 at least about half of the second diameter 1188
and/or less than or equal to about three-fourths of the second diameter 1188. In some
embodiments, the first diameter 1189 is about two-thirds the second diameter 1188.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
The lumen diameter can vary while the outer diameter of the elongate
structure 1191 remains the same. For example, the al n 1193 can have an outer
diameter that is the same as a portion between the proximal portion 1193 and the distal
portion 1192. The varying diameter s the proximal portion 1193 and the distal portion
1192 of the dilator 1190 to form a seal around the guide wire. As such, blood only flows
through the inlet openings 1194 to the outlet opening 1195.
FIGS. 18A-C illustrate a r 1290 includes an elongate structure 1291
having a lumen extending therethrough. The dilator 1290 can also include a proximal portion
1293 having a dilator hub 1296 for engaging the sheath and/or a distal portion 1292 having a
d end. As shown in A, the dilator hub 1296 can include hub members 1297a,
1297b configured to engage the sheath. For example, the sheath can include corresponding
features for receiving the hub members 1297a, 1297b. The hub members 1297a, 1297b can
also include one or more flanges to engage a corresponding e of the sheath. For
example, as shown in A, the hub members 1297a, 1297b, can e outward facing
flanges 1298a, 1298b and/or inward facing flanges 1299a, 1299b. The flanges can be
positioned near (e.g., flange 1299a, 1299b) and/or at a distal portion (e.g., flange 1298a,
1298b) of the hub members 1297a, 1297b.
The dilator 1290 can also include a bleed back feature to help determine
when the distal portion 1292 of the dilator 1290 enters a vessel. For example, the dilator
1290 can include one or more inlet openings 1294 at a distal portion 1292 of the dilator 1290.
As shown in A, the dilator 1290 can include two inlet openings 1294. The inlet
openings 1294 can be oned proximal to the tapered portion of the elongate structure
1291 and/or along the same plane transverse to the longitudinal axis of the dilator 1290. The
dilator 1290 can also include one or more outlet openings 1295. As shown in A, the
dilator 1290 can include one outlet opening 1295. In some embodiments, the outlet g
1295 can be positioned along the same plane as one of the inlet openings 1294. In other
embodiments, the outlet opening 1295 can be positioned along a different plane from any of
the inlet openings 1294. For example, the outlet opening 1295 can positioned along a plane
that is perpendicular to the plane passing through the inlet openings 1294.
The lumen extending through the elongate structure 1291 can have a
varying diameter. For example, the lumen can have a first er 1289 at the distal portion
1292 and proximal portion 1293 of the elongate structure 1292 and a second er 1288
between the distal portion 1292 and proximal portion 1293. The first er 1289 can be
16704496_1 (GHMatters) 4.NZ 26/10/2020
less than the second diameter 1288. The first diameter 1289 can e a diameter that is
larger than the outer diameter of the guide wire and smaller than the second diameter 1288.
In some embodiments, the first diameter 1289 at least about half of the second diameter 1288
and/or less than or equal to about three-fourths of the second diameter 1288. In some
embodiments, the first diameter 1289 is about two-thirds the second diameter 1288.
The lumen diameter can vary while the outer diameter of the elongate
structure 1291 remains the same. For example, the proximal portion 1293 can have an outer
diameter that is the same as a portion between the proximal portion 1293 and the distal
portion 1292. The varying diameter permits the proximal portion 1293 and the distal portion
1292 of the dilator 1290 to form a seal around the guide wire. As such, blood only flows
through the inlet openings 1294 to the outlet opening 1295.
In any of the above mentioned dilators, the diameter of any of the outlet
opening can be smaller than a diameter of any of the inlet openings. For example, the
diameter of any of the outlet g can be less than or equal to half of the diameter of any
of the inlet openings.
FIGS. 19A-19E illustrate how any of the above mentioned positioning
assemblies can engage a sheath. A illustrates an apparatus 1310 before the apparatus
1310 is delivered through the sheath 1380. The apparatus 1310 can include any of the
features of the sealant delivering apparatuses described above. The positioning ly
1314 can engage the sheath 1380, such that movement of the handle 1323 can also move the
sheath 1380. For e, the handle 1323 can include a shroud portion 1376 configured to
engage a hub 1383 of the sheath 1380. As shown in A, the shroud 1376 can include
two tines 1378, and each tine 1378 can include a barb 1379 positioned at a distal portion of
the tine 1378. The hub 1383 can include gs 1385 to e the tines 1378. Other
fastening isms without tines can also be used to couple the apparatus 1310 with the
sheath 1380, such as a snap fit, interference fit, or screw mechanism.
As described above, the t 1302 is initially positioned at a distal
portion of the positioning assembly 1314 (A). Before the positioning assembly 1314
enters the sheath 1380, a sealant sleeve 1350 covers the sealant 1302 to prevent exposure of
the sealant 1302 to the environment. The sealant sleeve 1350 can include any of the features
of the t sleeve 450 described above. As the positioning assembly 1314 enters the
sheath 1380, the sealant 1302 is transferred from the sealant sleeve 1350 to the sheath 1380
(B). The sheath hub 1383 and/or shroud 1376 retains the sealant sleeve 1350. The
16704496_1 (GHMatters) 4.NZ 26/10/2020
sheath hub 1383 and/or shroud 1375 retain the sealant sleeve 1350 even as the sheath 1380 is
retracted (C) or the sealant 1302 is tamped using the support member 1330 (D).
In some ments, as shown in , the tines engage an exterior
portion of the sheath hub 1483. For example, the hub 1483 can include grooves 1486
configured to engage the barbs 1478. The sheath hub 1483 can also include an inner
diameter that is smaller than an outer diameter of the sealant sleeve 1450 to facilitate the
sealant transfer from the sealant sleeve 1450 to the sheath 1480.
FIGS. 21A-21I describe a method of using the system including any of the
sealant delivering apparatuses and dilators described . The method can include one or
more of the steps described below. A procedural sheath (not shown) can be inserted through
a puncture 1504 in a vessel wall 1506 to gain access to a vessel lumen. After the guidewire
1502 extends through the procedural sheath and into the vessel, the procedural sheath can be
removed from the tissue tract, g the guidewire 1502 in place with the distal tip of the
guidewire 1502 oned within the vessel lumen. The dilator 1508 can then be advanced
through the closure system sheath 1510, and the dilator-sheath assembly can be advanced
over the guidewire 1502 (A). Any of the mechanisms described herein can be used to
determine when the dilator-sheath assembly enters the vessel lumen (e.g., a bleed back port
on the dilator and/or sheath).
After a distal end of the sheath 1510 s into the vessel lumen, the
dilator 1508 and guidewire 1502 can be ally retracted and removed leaving the distal
end of the sheath 1510 inside the vessel lumen (B). A positioning assembly 1512 can
then be introduced into the proximal end of the sheath 1510 and advanced distally through
the sheath 1510 (FIGS. 21C-E). As described herein, the positioning assembly 1512 can
include a sealant 1516 positioned at a distal portion of the positioning assembly 1512 prior to
entering the sheath 1510. After a positioning t 1514 s out from the distal end of
the sheath 1510 and into the vessel lumen, the positioning element 1514 can be expanded
within the vessel lumen (F).
The positioning assembly 1512 can then be withdrawn to seat the
positioning t 1514 against the vessel puncture 1504, and the t 1516 and sheath
1510 outside the vessel wall 1506 (G). The sheath 1510 can then be partially
retracted to expose the sealant 1516 (H). The support member 1518 can then be
advanced to tamp the sealant 1516 against the vessel wall 1506 (I). The positioning
16704496_1 (GHMatters) P104634.NZ 26/10/2020
element 1514 may thereafter be reduced in cross-section (e.g. deflated) and proximally
retracted through the sealant 1516. The support member 1518 may be left in position against
the sealant during proximal retraction of the positioning element 1514, to maintain the
location of the sealant. After removal of the positioning element 1514, the support member
1518 and sheath 1510 if still present within the tissue tract may be removed from the patient,
leaving the sealant 1516 positioned adjacent the vessel wall 1506.
In one implementation of the invention, the positioning element 1514 is an
inflatable balloon carried on a distal region of an elongate balloon catheter shaft. The balloon
catheter shaft comprises an elongate tubular body having a central lumen extending
therethrough to place the inflatable n in fluid ication with a source of ion
media, which may be coupled to the al end of the shaft. A central core wire extends
through at least a portion of the l lumen, and through the n, to support the distal
end of the balloon. The core wire may extend distally beyond the balloon for a length of at
least about 2 mm to 10 cm, and preferably at least about 3 cm to 5 cm to provide a flexible
advance t.
The inside er of the central lumen is greater than the outside
diameter of the core wire, to provide an inflation lumen and enable inflation of the balloon.
The sealant 1516 is preferably provided with a central lumen such that it
can be unted on a distal end of the balloon catheter shaft, proximally of the inflatable
balloon. The t 1516 may be formed as a cylindrical plug, having a central lumen
extending hrough. Alternatively, the sealant 1516 may be provided in a form of a sheet
or membrane, which can be wrapped in one, two, three, four, or more layers around the
catheter shaft.
Referring, for example, to Figures 21F and 21G, the sealant is
prepositioned on the distal catheter shaft and spaced a short distance from the proximal
surface of the inflated balloon. That space may be dimensioned to cooperate with the
anticipated wall thickness of the vessel, such as is illustrated in G, so that the inflated
balloon can be oned against the interior wall of the vessel and the t will be
positioned directly outside of the puncture adjacent the outside wall of the vessel. The space
measured in an axial direction between the distal end of the sealant and the proximal surface
of the n will typically be no greater than about 4 mm, and, in some embodiments, no
greater than about 3 mm or 2 mm.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
Using this construction, the sealant may be prepositioned on the n
catheter shaft at the point of manufacture, or, in any event, at the clinical site prior to
introduction of the balloon catheter into the t. The balloon catheter and the sealant are
thereafter guided as a single unit by the sheath 1510, from outside of the patient, into the
proximal end of the sheath 1510, and guided by the sheath 1510 to the vessel wall. The
balloon may thereafter be inflated within the vessel, and the system may be ally
withdrawn as a unit without any internal relative motion between the balloon catheter and the
sealant from the distal position illustrated in F to the proximal, seated position in G. Thereafter, proximal retraction of the outer sleeve s the sealant.
EXAMPLES
Example 1
Chitosan salt (chloride salt, an UP CL 214 from FMC BioPolymer,
Molecular Weight 150-400 kDa, degree of deacetylation >90%) was mixed with PEG-ester
(4-arm-10K-CM-HBA-NHS, MW 10kDa) and PEG-amine (8-arm-20K-PEG-NH3+Cl-, MW
20kDa) precursors in the appropriate buffers (phosphate and borate buffers, respectively) and
allowed to react to form hydrogels, which were subsequently frozen at about -37°C and then
allowed to lly freeze dry over a period of about 20 hours. The freeze dried hydrogels
were then conditioned through various humidity and temperature steps to yield freeze dried
hydrogels with structural ity able to be sliced into rectangular shapes (about 6mm by
about 15mm). Table 1 below summarizes the thickness and blood swelling data of hydrogels
synthesized by blending chitosan with PEG-ester and PEG-amine precursors in the
appropriate buffers (Samples 1 to 10), before ization, compared to a control sample
(PEG only hydrogel) that does not contain chitosan and is also tested before sterilization
es 11 and 12). The mole equivalent ratio of PEG-ester to PEG-amine has been varied
in this e, and was tested at a range of about 1 to about 1.5. Chitosan has been varied
between 0 to about 6.9% by weight in this example. The blood swelling tests were performed
by dipping the freeze dried hydrogels (pre-sterilization) in bovine blood at about 37oC for
about 45 seconds and measuring the percentage of ng by measuring the difference in
weight before and after dipping in the blood.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
Table 1
Final
PEG- PEG- Chitosan % Swell in
Sample No. Thickness
Amine (g) Ester (g) Chloride (g) bovine blood1
(mm)
1 0.817 0.803 0.120 1.66 3025, 3114
2 0.817 0.803 0.120 1.83 2933, 2613
3 0.860 0.845 0.085 2.10 4532, 4552
4 0.860 0.845 0.085 2.12 4536, 3914
0.648 0.972 0.120 1.51 3062, 2660
6 0.648 0.972 0.120 1.64 2648, 2813
7 0.682 1.023 0.085 2.05 4103, 3756
8 0.682 1.023 0.085 2.13 3850, 4026
9 0.767 0.938 0.085 1.89 3347, 3280
0.767 0.938 0.085 1.71 3051, 2960
11 0.903 0.887 0 1.10 2566, 2436
12 0.903 0.887 0 1.17 2922, 2681
1 erile rectangular (6mm by 15mm) freeze dried hydrogels were tested with two
samples per formulation tested for % of swelling in bovine blood.
The results of the Bovine Blood Swell are ted in Table 1 above.
Samples 11 and 12, which were made from PEG precursors only (no chitosan incorporated),
demonstrate a substantial ability to swell upon contact with blood. It is believed that this
swelling ability of PEG only hydrogels is due to the porosity teristics (size and number
of pores) that partially cross-linked PEG els can create upon freeze drying. The data
in Table 1 demonstrates that pre-sterilization, freeze dried PEG/Chitosan copolymer sealants
(Samples 1 to 10) made by covalently bonding chitosan with the PEG precursors can exhibit
a swelling y that is comparable to the swelling ability of the PEG-only hydrogels,
independent of the amount of chitosan orated (for the ratios tested), or can even exceed
the swelling ability of PEG-only hydrogels.
Example 2
16704496_1 (GHMatters) P104634.NZ 26/10/2020
an salt (sodium salt from Xianju Tengwang) was mixed with PEG-
ester (4-arm-10K-CM-HBA-NHS) and PEG-amine (8-arm-20K-PEG-NH3+Cl-) precursors
in the appropriate buffers (phosphate and borate buffers, respectively) and reacted until a gel
is formed. The resultant hydrogel was frozen at about -37°C and then allowed to gradually
freeze dry over a period of about 20 hrs. The freeze dried hydrogels were uently
conditioned through various humidity and temperature steps to yield freeze dried hydrogels
with structural ity allowing them to be manipulated (e.g., sliced, rolled and loaded on
the distal end of a delivery er (e.g., MYNXGRIP® catheter). Table 2 below summarizes
the s used and the thickness and swelling data of the final hydrogels synthesized by
blending chitosan with PEG-ester and PEG-amine precursors in the appropriate buffers. The
table below shows that freeze dried hydrogels synthesized by covalently bonding chitosan
with the PEG precursors can substantially swell upon t with bovine blood and that the
percent swell is comparable to the control samples.
Table 2
Sample Thickness
Chitosan le) % Swell2
No. (mm)
1 Control1 1.68 3001, 3139
2 Control1 1.58 3336, 3230
3 Same as control add 0.5%wt chitosan 2.36 3339, 3758
4 Same as control add 0.5%wt chitosan 2.43 3670, 3257
Same as control add 1%wt chitosan 2.98 1277, 1055
1 Control contains 0.903g PEG-amine -20K-PEG-NH3+Cl-) and 0.887g PEG-ester (4-
arm-10K-CM-HBA-NHS).
2 Two samples from each hydrogel cake were tested for % of swelling in bovine blood.
Example 3
Chitosan salt (chloride salt, Protasan UP CL 213 from FMC BioPolymer,
lar Weight 150-400 kDa, degree of deacetylation 75-90%) was mixed with PEG-ester
(4-arm-10K-CM-HBA-NHS, MW 10kDa) and PEG-amine (8-arm-20K-PEG-NH3+Cl-, MW
20kDa) precurso rs, at the amounts shown in Table 3 below, in the appropriate buffers
(phosphate and borate buffers, respectively) and allowed to react to form hydrogels, which
were subsequently frozen at about -37°C and then allowed to gradually freeze dry over a
period of about 20 hours. The mole lent ratio of ter to PEG-amine is about 1 in
16704496_1 (GHMatters) P104634.NZ 26/10/2020
this example. The chitosan was varied between 0 to about 5.5% by weight in this example.
The freeze dried hydrogels were then conditioned through various ty and temperature
steps to yield freeze dried hydrogels with structural ity such that it is able to be sliced
(about 6mm by about 15mm rectangles) and rolled into a cylindrical shape. Un-reacted
PEG-ester and PEG-amine components (which are the same PEG components used for the
freeze-dried portion of the Hydrogel sealant with no chitosan) were mixed together (at a mole
equivalent ratio of 1 to 1) by melting and applied to the distal end of the freeze-dried sealant.
The rolled freeze dried hydrogels with the un-reacted PEG ents on the distal end were
then loaded onto the distal end of a delivery er (i.e., a 6 French extravascular delivery
catheter, MYNXGRIP® Catheter).
The delivery ers were then subject to sterilization by e-beam. After
sterilization, the hydrogels were discharged from the catheter device by using a simulated
technique as in an actual use of the extravascular delivery system to assess their blood
swelling performance in bovine blood. The samples that were tested were chitosan with
PEG-ester and PEG-amine precursors (Formulations 3-2 to 3-6) compared to a control
sample (PEG only hydrogel) that did not contain chitosan (Formulation 3-1). The blood
swelling test was med by dipping the freeze dried hydrogels sterile) in bovine
blood at about 37oC for about 45 s and measuring the percentage of swelling by
measuring the difference in weight before and after dipping in the blood. The results of the
blood swelling test are reproduced below in Table 3.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
Table 3
% Swell in bovine
Formulation PEG-Amine PEG-Ester an Thickness
blood
No. (g) (g) (g) (mm)
(Avg + St. Dev.)1
3-1 0.865 0.925 0 1.10 1549 ± 239
3-2 0.858 0.907 0.025 2.10 NT2
3-3 0.850 0.890 0.050 1.60 939 ± 191
3-4 0.844 0.886 0.060 1.40 1358 ± 196
3-5 0.834 0.876 0.080 1.50 1389 ± 249
3-6 0.824 0.866 0.100 1.75 748 ± 169
1 Post-sterile freeze dried hydrogels after loaded onto a 6Fr extravascular delivery system; 10
samples per formulation were tested for % of swelling in bovine blood.
2 NT: Not tested. Formulation 3-2 was not tested for blood swelling because it could not be
loaded onto the MYNXGRIP® catheter system because of its thickness.
Formulation 3-1 (Control) from Table 3 above demonstrated a substantial
ability to swell upon contact with blood. The data for Formulations 3-3 through 3-5
demonstrated that post-sterile freeze dried PEG/Chitosan copolymer sealants that were loaded
onto a 6Fr extravascular ry catheter and then discharged can exhibit a swelling ability
that is comparable to the swelling ability of the PEG-only hydrogels. Although the swelling
ability of Formulation No. 3-6 was lower as compared to the control sample, this value (about
750% swelling in blood) is also considered to have comparable swelling as to the l
(Formulation No. 3-1).
Example 4
Freeze dried PEG/Chitosan hydrogels were made as in Example 3 except
that the mole equivalent ratio of PEG-ester to PEG-amine was 1.1. The hydrogels were rolled
and loaded on the distal end of a delivery catheter as before (e.g., 6Fr extravascular ry
catheter, MYNXGRIP® Catheter) and all ers were sterilized by . The chitosan
was varied between 0 to about 5.5% by . The blood swelling tests were performed as
in Example 3. Formulation 4-1 was made from PEG precursors only (no chitosan
incorporated), which is the control , and Formulations 4-2 to 4-6 were made with
varying amounts of itosan, as shown in Table 4 below. The results of the blood
swelling test are reproduced below in Table 4.
16704496_1 ters) P104634.NZ 26/10/2020
Table 4
% Swell in bovine
PEG-Amine PEG-Ester Chitosan Thickness
Sample No. blood
(g) (g) (g) (mm)
(Avg + St. Dev.)1
4-1 0.865 0.925 0 1.10 1549 ± 239
4-2 0.827 0.938 0.025 2.10 NT2
4-3 0.815 0.925 0.050 1.65 643 ± 107
4-4 0.810 0.920 0.060 1.90 NT2
4-5 0.801 0.909 0.080 1.40 912 ± 207
4-6 0.792 0.898 0.100 1.60 973 ± 255
1 Post-sterile freeze dried hydrogels after loaded onto a 6Fr extravascular delivery system; 10
s per formulation were tested for % of swelling in bovine blood.
2 NT: Not . Formulations 4-2 and 4-4 were not tested for blood swelling because it
could not be loaded on the MYNXGRIP® catheter system because of its thickness.
Formulation 4-1 (Control) demonstrated a substantial ability to swell upon
contact with blood when loaded onto the 6Fr extravascular ry er and after
sterilization. In evaluating Formulations 4-3, 4-5 and 4-6, these samples demonstrated that
terilization, freeze dried PEG/Chitosan copolymer sealants that have been loaded onto
6Fr extravascular ry ers can t a swelling ability that is considered to be
comparable to that of the PEG-only hydrogels.
Example 5
The blood clotting ability of PEG/Chitosan copolymer hydrogels
(Formulations 3-2 to 3-6 from e 3) was compared with the blood clotting ability of
PEG-only hydrogels (control, Formulation 3-1 from Example 3) before sterilization. The
samples were prepared in advance of performing the blood clotting test by cutting the freezedried
hydrogels into disks with a diameter of about 8 mm. In performing the blood clotting
test, the lized disk samples were treated with bovine whole blood (anticoagulated with
Acid Citrate Dextrose - ACD) and CaCl2 and put in the oven at about 37oC for about 10
minutes as part of the incubation period. After the incubation period, red blood cells that were
not trapped in the clot were hemolyzed in DI water and the UV absorbance of the resulting
hemoglobin solution was measured at a wavelength of about 540nm. The higher absorbance
value of the hemoglobin solution indicates a slower clotting rate, while a lower absorbance
value indicates a faster clotting rate. Table 5 below summarizes the results of the blood
16704496_1 (GHMatters) P104634.NZ 26/10/2020
clotting test of hydrogels made with PEG-only (Formulation 3-1, Control) compared to the
hydrogels made with PEG/Chitosan copolymers (Formulation numbers 3-2 through 3-6).
Table 5
UV absorbance
Formulation PEG-Amine PEG-Ester Chitosan Thickness
at 540nm
No. (g) (g) (g) (mm)
( Avg + St. Dev.)1
3-1 0.865 0.925 0 1.10 0.170 ± 0.040
3-2 0.858 0.907 0.025 2.10 0.036 ± 0.020
3-3 0.850 0.890 0.050 1.60 0.033 ± 0.017
3-4 0.844 0.886 0.060 1.40 0.055 ± 0.031
3-5 0.834 0.876 0.080 1.50 0.045 ± 0.034
3-6 0.824 0.866 0.100 1.75 0.006 ± 0.006
1 Three samples from each hydrogel formulation were tested.
From the results, it can be seen that Formulations 3-2 to 3-6, which
se the PEG/Chitosan copolymers, result in faster clotting rates compared to hydrogels
that comprise only PEG, as exhibited by the lower UV absorbance rates of the itosan
s. All of the PEG/Chitosan copolymers tested indicate a substantial improvement in
the blood clotting ability compared to the PEG-only Control sample, independent of the
amount of Chitosan incorporated.
Example 6
Similar to e 5, the blood clotting ability of pre-sterile
PEG/Chitosan copolymer hydrogels (Formulations 4-2 to 4-6 from Example 4, prior to
sterilization) was compared to a pre-sterile PEG-only hydrogel (control, Formulation 4-1
from Example 4, prior to sterilization) using the blood clotting test explained above in
e 5. The test parameters of the blood ng test were kept the same as in Example
. Table 6 below summarizes results of the blot clotting test of hydrogels manufactured with
PEG-only (Formulation 4-1, Control) ed to hydrogels manufactured with
PEG/Chitosan copolymers (Formulation s 4-2 through 4-6).
16704496_1 ters) P104634.NZ 26/10/2020
Table 6
UV absorbance
Formulation PEG-Amine PEG-Ester Chitosan Thickness
at 540nm
No. (g) (g) (g) (mm)
(Avg + St. Dev.)1
4-1 0.865 0.925 0 1.10 0.201 ± 0.045
4-2 0.827 0.938 0.025 2.10 0.003 ± 0.005
4-3 0.815 0.925 0.050 1.65 0.033 ± 0.010
4-4 0.810 0.920 0.060 1.90 0.008 ± 0.006
4-5 0.801 0.909 0.080 1.40 0. 083 ± 0.045
4-6 0.792 0.898 0.100 1.60 0.034 ± 0.027
1 Three samples from each el formulation were tested.
Table 6 shows that the hydrogels that comprise PEG/Chitosan mers
(Formulations 4-2 to 4-6) result in faster clotting rates due to the lower UV absorbance values
as ed to the hydrogels that comprise PEG only (Formulation 4-1, Control). All of the
PEG/Chitosan copolymers tested indicate a substantial improvement in the blood clotting
ability when compared to PEG-only, independent of the amount of Chitosan incorporated.
Example 7
Similar to Example 5, the blood clotting ability of PEG only hydrogels (no
chitosan incorporated) of various thicknesses was tested in order to te the effect of
thickness on the blood clotting ability of the hydrogel disks (diameter of about 8mm) before
sterilization. The test parameters of the blood clotting test were kept the same as in Example
. Table 7 below summarizes results of the blot clotting test of hydrogels manufactured with
PEG-only (Controls) of various thicknesses as shown below in the table.
Table 7
UV ance
Formulation PEG-Amine PEG-Ester Chitosan Thickness
at 540nm
No. (g) (g) (g) (mm)
( Avg + St. Dev.)1
7-1 0.788 0.814 0 0.80 0.226 ± 0.040
7-2 0.788 0.814 0 0.99 0.227 ± 0.084
7-3 0.881 0.909 0 1.00 0.225 ± 0.008
7-4 0.881 0.909 0 1.22 0.113 ± 0.023
7-5 0.873 0.917 0 1.47 0.156 ± 0.025
96_1 (GHMatters) 4.NZ 26/10/2020
1 Three samples from each hydrogel formulation were tested.
Table 7 indicates that as expected the blood clotting ability of ly
hydrogels ses with increasing ess up to a certain point and then the blood clotting
ability starts to se, unaffected by the r sample pieces. However, the effect of
thickness on the blood clotting ability of the el disks (without chitosan) is not as
significant as is the incorporation of chitosan into these hydrogel sealants. The blood clotting
test data of hydrogels of similar thickness of PEG/Chitosan hydrogels as compared to PEG-
only hydrogels (e.g. Formulation 7-5 from Table 7 above compared to Formulations 3-4 and
4-5 from Tables 5 and 6 respectively which are all about 1.4 mm thick) show that the
formulations that contain chitosan result in substantially faster clotting rates.
Example 8
Hydrogel prototypes comprising PEG/Chitosan copolymer sealants as
made in Example 3, Formulation 3-3, were loaded onto a 6 French delivery system (i.e., the
MYNXGRIP® vascular closure device) and tested in an ovine model. The PEG/chitosan
sealants were sized small enough to fit, i.e., be loaded, onto the 6Fr delivery . Seven
femoral access sites were sealed using the PEG/Chitosan mer sealants in this study to
assess their performance in femoral punctures that range in size from small bore sizes to large
bore sizes. rd catheterization techniques were followed including contemporary
anticoagulation. Procedural s utilized were sized to create femoral artery punctures
from 7Fr, 8.5Fr, 9Fr, and 10Fr. The 6Fr delivery systems loaded with the PEG/chitosan
sealants were each deployed into one of the seven punctures. All deployments of the
PEG/chitosan sealants (Formulation 3-3) using the 6Fr delivery systems were clinically
successful, e.g., the PEG/chitosan sealed the puncture. These results demonstrate that arterial
closure (up to a puncture size from a 10Fr sheath) can be feasible using a 6Fr-compatible
PEG/Chitosan sealant. The 6 French delivery device was utilized to show that a large bore
puncture can be closed with a small bore device, i.e., a device that is sized smaller than the
size of the puncture. However, a delivery device sized larger than 6 Fr may also be used and,
in particular, a delivery device sized similar to the size of the puncture may of course be used.
It is contemplated that s combinations or subcombinations of the
specific features and s of the embodiments disclosed above may be made and still fall
within one or more of the ments herein. r, the disclosure herein of any
particular feature, aspect, method, property, characteristic, quality, ute, element, or the
16704496_1 (GHMatters) P104634.NZ 26/10/2020
like in connection with an embodiment can be used in all other embodiments set forth herein.
Accordingly, it should be understood that various features and aspects of the disclosed
embodiments can be combined with or substituted for one r in order to form g
modes of the disclosed embodiments. Thus, it is intended that the scope of the present
embodiments herein disclosed should not be limited by the particular disclosed embodiments
described above. Moreover, while the sealant, apparatus and/or method disclosed herein can
be susceptible to various modifications, and alternative forms, specific examples thereof have
been shown in the drawings and are herein described in detail. It should be understood,
however, that the sealant, device and method are not to be limited to the particular forms or
methods disclosed, but to the contrary, can cover all modifications, equivalents, and
alternatives falling within the spirit and scope of the various embodiments described and the
ed claims. Any methods disclosed herein need not be performed in the order
recited. The methods disclosed herein include n actions taken by a practitioner;
however, they can also include any third-party instruction of those actions, either expressly or
by implication. For example, s such as “inserting a vascular t to seal a vascular
puncture” include ucting the insertion of vascular sealant to seal a vascular puncture.”
The ranges disclosed herein also encompass any and all overlap, subranges
, and ations thereof. Language such as “up to,” “at least,” “greater than,” “less
than,” “between,” and the like includes the number recited. Numbers preceded by a term
such as “about” or ximately” e the recited numbers. For e, “about 10
nanometers” includes “10 nanometers.”
It should also be noted that the “French” gauge is ⅓ mm. For example,
reference to 1 French = ⅓ mm, 2 French = ⅔ mm, 3 French = 1 mm, and so on.
16704496_1 (GHMatters) P104634.NZ 26/10/2020
Claims (13)
1. An apparatus for sealing a puncture through tissue, comprising: a t having a first n formed from a -dried hydrogel, wherein the first section expands when exposed to physiological fluid within a puncture; and wherein the first section of the sealant comprises a hydrogel comprising chitosan bound to at least one polyethylene glycol polymer, wherein, upon exposure to an aqueous physiological fluid, the hydrogel expands and seals the puncture through the tissue; and a sheath having a lumen, wherein the sealant is positioned in the lumen of the sheath; wherein the apparatus is sized at 2.33 mm or smaller.
2. The apparatus of Claim 1, wherein the chitosan has a degree of deacetylation of at least 60%.
3. The apparatus of Claim 1 or 2, wherein the chitosan has a lar weight between about 10 kilodaltons and about 600 kilodaltons.
4. The apparatus of any one of Claims 1-3, wherein the chitosan is bound to the at least one polymer by a non-covalent bond.
5. The apparatus of any one of Claims 1-4, wherein the at least one polyethylene glycol polymer comprises polyethylene glycol-amine and polyethylene glycol-ester and wherein an equivalent ratio of active group sites of chitosan to PEG-ester is between about 0.1 to about 5.
6. The apparatus of any one of Claims 1-5, n the sealant ses a second section extending from the distal end of the first n, the second section sing non-crosslinked precursors.
7. The apparatus of Claim 6, wherein the non-crosslinked precursors se hylene glycol-amine and polyethylene glycol-ester.
8. The apparatus of Claim 6 or 7, wherein the second section further comprises chitosan.
9. The apparatus according to any one of Claims 6-8, wherein the first and second sections have a substantially uniform outer cross-section along their s between about 1 and about 8 millimeters.
10. The apparatus according to any one of Claims 6-9, n the first and second sections are suitable for expansion in the dimension of the outer cross section of the sealant of at least 50%.
11. The apparatus of any one of claims 1-10, wherein the first section of the sealant comprises between about 0.5% and about 8% (by weight) chitosan.
12. The apparatus of any one of claims 1-11, wherein the apparatus is sized at 2 mm.
13. The apparatus of any one of claims 1-12, n the puncture is sized between 2.33 mm and 8 mm; or wherein the puncture is sized between 2.33 mm and 3.33 mm. 16704496_1 (GHMatters) P104634.NZ 26/
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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NZ756435A NZ756435A (en) | 2014-05-29 | 2015-05-28 | Chitosan and polyethylene glycol copolymers and methods and devices for using same for sealing a vascular puncture |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US201462004806P | 2014-05-29 | 2014-05-29 | |
US62/004,806 | 2014-05-29 | ||
PCT/US2015/033020 WO2015184160A1 (en) | 2014-05-29 | 2015-05-28 | Chitosan and polyethylene glycol copolymers and methods and devices for using same for sealing a vascular puncture |
Publications (2)
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NZ727124A NZ727124A (en) | 2020-10-30 |
NZ727124B2 true NZ727124B2 (en) | 2021-02-02 |
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