NZ739881B2 - Aortic cannula for ex vivo organ care system - Google Patents
Aortic cannula for ex vivo organ care system Download PDFInfo
- Publication number
- NZ739881B2 NZ739881B2 NZ739881A NZ73988116A NZ739881B2 NZ 739881 B2 NZ739881 B2 NZ 739881B2 NZ 739881 A NZ739881 A NZ 739881A NZ 73988116 A NZ73988116 A NZ 73988116A NZ 739881 B2 NZ739881 B2 NZ 739881B2
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- New Zealand
- Prior art keywords
- aorta
- pivot arm
- cannula
- pivot
- aortic
- Prior art date
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- 210000000056 organs Anatomy 0.000 title claims abstract description 49
- 210000000709 Aorta Anatomy 0.000 claims abstract description 115
- 238000007906 compression Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 9
- 210000001519 tissues Anatomy 0.000 description 9
- 241001631457 Cannula Species 0.000 description 3
- 206010022114 Injury Diseases 0.000 description 3
- 210000003813 Thumb Anatomy 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
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- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 2
- 230000000881 depressing Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000002459 sustained Effects 0.000 description 2
- 238000002054 transplantation Methods 0.000 description 2
- 210000003811 Fingers Anatomy 0.000 description 1
- 208000002473 Lacerations Diseases 0.000 description 1
- 210000000088 Lip Anatomy 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000000994 depressed Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000004 hemodynamic Effects 0.000 description 1
- 230000002631 hypothermal Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000000082 organ preservation Substances 0.000 description 1
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- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
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- 230000000451 tissue damage Effects 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N1/00—Preservation of bodies of humans or animals, or parts thereof
- A01N1/02—Preservation of living parts
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N1/00—Preservation of bodies of humans or animals, or parts thereof
- A01N1/02—Preservation of living parts
- A01N1/0236—Mechanical aspects
- A01N1/0242—Apparatuses, i.e. devices used in the process of preservation of living parts, such as pumps, refrigeration devices or any other devices featuring moving parts and/or temperature controlling components
- A01N1/0247—Apparatuses, i.e. devices used in the process of preservation of living parts, such as pumps, refrigeration devices or any other devices featuring moving parts and/or temperature controlling components for perfusion, i.e. for circulating fluid through organs, blood vessels or other living parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1033—Swivel nut connectors, e.g. threaded connectors, bayonet-connectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1038—Union screw connectors, e.g. hollow screw or sleeve having external threads
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
Abstract
cannula for use in an ex vivo organ care system comprises a cannula body comprising a fitting adapted to connect to an organ care system, and an aorta interface to contact an aorta, and a pivotably mounted arm strap on which a spring applies pressure, contacts the aorta to hold the aorta on the aorta interface. The pivot mount allows the arm strap to uniformly contact the aorta to hold the aorta more securely on the aorta interface. orta interface. The pivot mount allows the arm strap to uniformly contact the aorta to hold the aorta more securely on the aorta interface.
Description
AORTIC CANNULA FOR EX VIVO ORGAN CARE SYSTEM
RELATED APPLICATIONS
This ation is related to Application Serial No. 62/215,825, titled c
Cannula for EX Vivo Organ Care ,” filed September 9, 2015, which is incorporated
herein by reference in its entirety.
TECHNICAL FIELD
The present invention relates generally to medical s and, in particular, aortic
cannulas for use in eX vivo organ care systems. Specifically the invention relates to aortic
cannulas used to return perfusate to the heart or delivering perfusate from the heart while the
organ is sustained ex vivo at physiologic or near-physiologic conditions.
BACKGROUND
t organ preservation ques typically involve hypothermic storage of
the organ in a chemical perfusate solution on ice. However, uses of conventional approaches
results in injuries that increase as a function of the length of time an organ is maintained ex-
vivo. These time restrictions limit the number of recipients who can be reached from a given
donor site, thereby cting the recipient pool for a harvested heart. Even within the few
hour time limit, the heart may nevertheless be significantly damaged.
Effective preservation of an eX-vivo organ would also e numerous other
benefits. For instance, ged ex-vivo preservation would permit more careful monitoring
and functional testing of the harvested organ. This would in turn allow earlier detection and
potential repair of defects in the harvested organ, further reducing the likelihood of
transplantation failure. The y to perform simple repairs on the organ would also allow
many organs with minor defects to be saved, whereas current transplantation techniques
require them to be discarded. In addition, more effective matching between the organ and a
particular recipient may be ed, further reducing the likelihood of eventual organ
rejection.
Improved eX-vivo organ care has been achieved through the use of an eX-vivo
organ care system which maintains organs at physiologic or near-physiologic conditions. Not
only does the system maintain the organ at physiologic temperatures, but in the case of the
heart, the system ins perfusate flow through the organ. In addition the system
measures and monitors electric stimulation in the heart. The eX vivo organ care system where
the heart sustained ex vivo at physiologic or near-physiologic conditions are described in
Application Ser. No. 11/822495 entitled “Systems for monitoring and applying electrical
currents in an organ perfusion system,” U.S. Pat. No. 8,304,181 ed “Method for o
organ care and for using e as an indication of donor organ status,” and U.S. Pat. No.
846 entitled “Compositions, methods and devices for maintaining an organ,” which are
incorporated herein by reference.
To maintain physiologic or near-physiologic perfusate flow through the heart, the
organ must interface with the system via the aorta. This interface is achieved via an aortic
cannula. Current aortic cannula designs lead to organ slippage, difficulties in maintaining a
liquid tight seal, and damage to the aorta. Often these designs rely solely upon a cable tie in
t with the aorta to tighten the aorta to the aortic cannula. Depending on the size of the
aorta and the size of the aortic cannula, there is a risk of laceration due to the cable ties exerting
too much n on aortic tissue, or the risk of e if they do not exert sufficient tension.
Thus, there exists a need for an aortic cannula that is easy for health care workers to deploy,
s a tight seal with the aorta, reduces aortic slipping, and causes minimal damage to the
aorta.
In view of the foregoing, improved devices for ing the aorta to the system and
methods of use in ex vivo organ care systems are needed.
SUMMARY
In one embodiment the invention includes an aortic cannula for use with an ex vivo
organ care system and methods of using the same.
One aspect of the invention includes an aortic cannula for use in an ex vivo organ care system,
the aortic cannula comprising:
a cannula body comprising:
a fitting configured to connect to the ex vivo organ care system, and
an aorta interface configured to contact an aorta;
a pivot arm strap operably connected to a pivot mount, wherein the pivot mount is
ured to allow the pivot arm strap to uniformly contact the aorta to hold the
aorta on the aorta interface; and
a spring configured to apply pressure to the pivot arm strap to hold the aorta on the aorta
interface.
r aspect of the invention includes an aortic cannula comprising, a cannula body which
further comprises, a fitting adapted to connect to an organ care system, an aorta interface to
contact an aorta, and a pivot arm strap operably connected to a pivot mount, wherein the pivot
mount allows the pivot arm strap to uniformly contact the aorta to hold the aorta on the aorta
interface. In one embodiment, the aortic cannula further comprises a pivot arm connected to the
pivot arm strap and to the pivot mount, such that when the pivot arm is moved toward the
cannula body by rotation around the pivot mount the pivot arm strap moves away from the
cannula body. In another embodiment of the aortic cannula the pivot arm and the pivot arm strap
are parts of a single piece. In another ment, the aortic a comprises a spring which
applies pressure to the pivot arm strap to hold the aorta on the aorta interface. In another
embodiment of the aortic cannula a dowel pin communicates with the spring to allow the pivot
arm to rotate around the dowel pin. In another embodiment of the aortic cannula the pivot arm
further
- 2a (the next page is page 3) -
comprises a grip pad used to depress the top of the pivot arm. In another embodiment of the
aortic cannula the grip pad is textured. In another embodiment of the aortic cannula the grip
pad is removable. In another ment of the aortic cannula the pivot arm straps further
comprise a loop and guide which retain a cable tie around the pivot arm strap. In another
embodiment, the aortic a further comprises s sized to normalize the
compression d on the aorta by the cable tie such that the same amount of pressure will
be exerted on the aorta regardless of the size of the pivot arm strap for a given cable tie
tension. In another embodiment, the aortic cannula further comprises a connector used to
reversibly secure the aortic cannula to an organ chamber. In r embodiment of the
aortic cannula the connector is a threaded g nut. In another embodiment of the aortic
cannula the aorta interface is textured.
One aspect of the invention includes a method of using an aortic cannula to place
a heart in fluid communication with an organ care system the method comprising, selecting
an aortic cannula sized to fit the aorta of the heart the aortic cannula comprising, a cannula
body further comprising, a fitting d to connect to an organ care system, an aorta
interface to contact an aorta, and a pivot arm strap operably connected to a pivot mount,
wherein the pivot mount allows the pivot arm strap to uniformly contact the aorta to hold the
aorta on the aorta interface, depressing the pivot arm such that it rotates around the dowel pin
and the pivot arm strap moves away from the cannula body, placing the cannula in the aorta,
releasing the pivot arm, ning a cable tie around the pivot arm strap to hold the aorta in
place, and inserting the tapered fitting into an organ care system. In one embodiment, the
method further comprises the step of suturing surgical felt ts on the aorta before
placing the aorta on the aortic cannula.
BRIEF DESCRIPTION OF THE FIGURES
The following figures depict rative embodiments of the invention.
Fig. 1 illustrates a m depicting an aortic cannula in one embodiment.
Fig. 2a illustrates a side view of a cannula body in one embodiment.
Fig. 2b illustrates a side view of a cannula body and a spring pocket according to
one embodiment.
Fig. 2c illustrates a side view of a cannula body in one embodiment.
Fig. 3a illustrates one embodiment of a pivot arm.
Fig. 3b illustrates a side view of a pivot arm and strap according to one
embodiment.
Fig. 3c rates another view of a pivot arm and strap according to one
embodiment
Fig. 3d illustrates another view of a pivot arm and strap according to one
embodiment.
Fig. 3e illustrates a top view of a pivot arm and strap according to one
embodiment.
Fig. 4 illustrates a diagram showing the shape of a a body texture in one
embodiment.
Fig. 5 illustrates a top view of a pivot mount according to one embodiment.
Fig. 6 illustrates a tip holder according to one embodiment.
DETAILED PTION
Cannula Body
Figure 1 is a diagram depicting the aortic cannula 100 in one embodiment. The
aortic cannula device 100 comprises a cannula body 114, a locking nut 102, and a pivot arm
140. The cannula body 114 may contain three sub-sections, a tapered fitting 108, a tapered
midsection 130 and an aorta interface 132. These subsections can be seen in Figure 1 as well
as in various side views of the cannula body 114 depicted in Figures 2a-2b. In one
ment, the cannula body 114 is made from injection molded clear rbonate.
However, one of skill in the art would understand that the cannula body can be made from
other types of plastic or any other suitable material.
One of skill in the art would recognize that the while the shape of the cannula
body 114 should be generally cylindrical, the opening need not be perfectly circular. The
three sub-sections, tapered fitting 108, tapered midsection 130, and aorta interface 132, may
be of different lengths relative to one another. In addition the different subsections may be
made from one piece and they may have the same diameter. One of skill in the art would also
recognize that the taper angle in the sub-sections, tapered fitting 108, tapered midsection 130,
and aorta interface 132, may vary so long as the aorta ace reaches a diameter within the
l range of the diameter of an human aorta.
One end of the aortic cannula 100 forms tapered fitting 108. The tapered fitting is
sized to couple to a female connector on an organ chamber (not shown) to create a seal. A
threaded g nut 102, pictured in Figure 1, is used to ibly secure the aortic cannula
100 to the organ chamber (not shown). In one embodiment, the locking nut 102 has four
wings 104 extending from its outer surface that are used for gripping and turning the g
nut 102. In one embodiment the wings 104 are rectangular. One of skill in the art would
understand that the wings 104 could be any shape or d. The locking nut 102 may have
a lip protruding inward from its bottom edge that snaps over locking ridge 110 and into the
locking groove 112 on the cannula body 114. The g groove 112 and the locking ridge
110 can be seen in Figure 1 and Figures 2a—2b. Alternatively, the locking nut 102 may be
secured to the cannula body 114 using other mechanisms known to one skilled in the art.
Once the locking nut 102 is seated in the locking groove 112, the aortic a 100 is
securely fastened to the organ chamber (not shown) by turning the locking nut 102. Perfusate
can be perfused through the cannula into the heart without leaking. One of skill in the art
would understand that other designs can be used to attach the aortic cannula 100 to the organ
chamber to prevent leakage.
One of skill in the art would tand that the aortic cannula 100 can be
connected to an organ care system or any other tube, device, or path of flow. In addition, one
of skill in the art would appreciate that the locking nut 102 may be omitted in embodiments
where the male-female tion between the aortic cannula 100 and the organ care system
(not shown) is tight enough to prevent e. One of skill in the art would also ize
that the g nut 102 could be replaced with other types of connectors generally used in
the art to create a flow path between two tubes.
The tapered midsection 130 extends from the bottom edge of the tapered fitting
108 to the top edge of the aorta interface 132. The tapered midsection 130 reaches a final
diameter the size of the aorta interface 132. The tapered midsection 130 helps to ensure
smooth fluid flow from the aorta interface 132 to the tapered fitting 108. The tapered
tion 130 also helps minimize air trap and sis and improve hemodynamics due
to the smooth transition in flow path. The tapered midsection 130 has a pivot mount 122 and
a spring pocket 106. The pivot mount 122 and the spring pocket 106 may be integrated with
the tapered midsection 130. In one embodiment, the tapered midsection 130 has two pivot
mounts 122 and two spring pockets 106, shown in Figures 1 and 2b. The pivot mounts 122
are located on each side of the cannula body 114. One of ordinary skill in the art would
understand that one or more pivot mounts 122 and spring pockets 106 could be used. As
shown in Figure 5, in one embodiment the pivot mount 122 has a circular center hole 138
sized to receive a dowel pin 120. The spring pocket 106 is located on the cannula body 114
and provides a space for a torsional spring (not shown). The dowel pin 120 fits through one
side of the center hole 138 on the integrated pivot mount 122, through the center of the
2016/050512
torsional spring in the spring pocket 106, and through the other side of the center hole 138 on
the integrated pivot mount 122 . The torsional spring is oriented in spring pocket 106 such
that depressing the pivot arm compresses the spring. One end of the torsional spring rests in
the spring end pocket 134 on the thumb pad 116 seen in Figure 3a. One of ordinary skill in
the art would understand that there are various ways to attach the pivot mount 122 to the
cannula body 114 that allows the pivot mount 122 to pivot or move so that the aorta can be fit
onto the cannula body 114 in operation. In one embodiment, the pivot mount 122 is made
from injection molded polycarbonate, acetyl, or any suitable material.
One of skill in the art would also recognize that the torsional spring could be
replaced with other types of spring loading mechanisms or omitted completely. The torsional
spring could also be replaced by a molded leaf spring on the pivot arm or on the grip pad.
With the use of a molded leaf spring the dowel pin would be omitted and cylindrical bosses
on the cannula body 114 or a similar structure could be used to perform the same function.
The aorta interface 132 is located adjacent the tapered tion 130. The aorta
interface 132 may be of a constant er and sized to fit within the aorta. The diameter of
the aorta interface 132 can be between 0.5 and 2 inches. In some embodiments the diameter
of the aorta ace 132 can be between 0.75 and 1.125 . ably, in some
embodiments the diameter of the aorta interface is 0.75 inches, 0.875 inches, 1 inch, or 1.125
inches. The aorta ace 132 may be smooth or textured. Figure 1 illustrates a texture 128
on the aorta interface 132 to help prevent the aorta from slipping off of the cannula body 114.
In the embodiment shown in Figure l, the aortic cannula 100 is placed in the aorta so that the
aorta does not rise above the end of the e 128. Figure 4 is a cross sectional view of one
embodiment of the texture 128. The texture 128 may be of any shape. In one embodiment the
texture 128 comprises concentric ridges extending around the aorta interface 132 that are
sloped at a 45 degree angle on their lower side and are perpendicular to the cannula body 114
on their upper face. This design allows the aorta to slide onto the aorta interface 132 easily,
but prevents the aorta from sliding off the aorta interface 132. Preferably the ridges are about
0.005 inches tall. However, one of skill in the art would understand that the texture features
could be of any shape and size to allow the aorta to be situated around the aorta interface 132
and to help hold the aorta in place while minimizing damage to the tissue. In one
embodiment, the radial edge of the aortic interface 132 does not have a ridge to ze
trauma to the tissue. atively, one of skill in the art would recognize that a ridge could
be designed to minimize tissue trauma and to hold the aorta in place.
Pivot Arm
A pivot arm 140 is coupled to the pivot mount 122. Figures 3a-e illustrate
different views of a pivot arm and pivot arm strap (discussed below) in one embodiment.
The pivot arm 140 allows the device 100 to adjust and grip aortas of different thicknesses. In
one embodiment the cannula body 114 includes two pivot arms 140 coupled to two pivot
mounts 122 on the a body, One of ordinary skill would tand that the number of
pivot arms 140 corresponds to the number of pivot mounts 122. The pivot arm 140
comprises a grip pad 116, a sliding pivot window 118, and a strap 124. The sliding pivot
window 118 allows the strap 124 to maintain uniform contact with the aorta through a range
of motion. The grip pad 116 can be , or contain features such as molded ridges or
other texture to stop the user’s fingers from slipping. The grip pad can be any shape,
preferably round. In some embodiments the grip pad 116 may be detachable. In other
embodiments a reusable tool that attaches to the pivot arms 140 could be used in place of the
grip pads 116.The dowel pin 120 allows the pivot arm 140 to rotate around the dowel pin 120
when it is actuated. The pivot arm 140 is made from injection molded acetyl or any material
with r properties. One of skill in the art would recognize that while the sliding pivot
provides certain advantages over a fixed pivot point, a fixed pivot point could also be used.
Some embodiments may include a locking mechanism to hold the pivot arm 140 in an open
Pivot Arm Strap
The pivot arm strap 124 is coupled to the pivot arm 140. The pivot arm strap
is best seen in Figs. 1 and 3. As shown in Figure 1, in one embodiment the cannula body 114
includes two pivot arm straps 124 coupled to two pivot arms 140. One of ordinary skill
would understand that the number of pivot straps 124 corresponds to the number of pivot
arms 140. The pivot arm strap 124 and the sliding pivot window 118 allow the cannula body
114 to uniformly grip the aorta. The pivot arm strap 124 is designed to be stiff enough to
hold the aorta, while ining enough lity to conform to the aorta and minimize
tissue damage. The pivot arm straps 124 are curved. The pivot arm strap 124 optionally has a
loop 136 and a guide 142 to retain a cable tie (not shown) around the pivot arm strap 124.
The cable tie is made from a flexible nylon material or material with similar properties. Once
the cable tie has been threaded through the loop 136 and slotted in the guide 142, it is
tightened to the d tension. The amount that the cable tie is tightened is the same for all
sizes of cannulas. Windows 126 in the pivot arm strap 124 normalize the pressure exerted on
the aorta by altering the e area of the strap in contact with the aorta. Accordingly, the
size of the windows 126 vary depending on the size of the aorta, The size of the windows
126 are calculated so that when the cable tie is tightened, it exerts the same compression on
the aorta for every size device 100. Thus, the compression exerted on the aorta holds it in
place without ng the tissue. One of ordinary skill would understand that alternatively,
the cable tie may be tightened to a specific tension for each size of the device 100. In
addition, other mechanisms of clamping to hold the aorta in place could be used in place of
the cable tie, for example a hose clamp or a tension strap. onally, the pivot arm strap
124 and the windows 126 could be of different shapes and sizes. Alternatively, the windows
could be omitted. One of skill in the art would also understand that the pivot arm 140 and the
pivot arm strap 124 could be sections of a single piece. In addition, one of skill in the art
would tand that the inner surface of the pivot arm strap 124 could be smooth, or
textured for additional traction.
In one embodiment, the aorta is secured to the cannula body. The grip pad 116 is
depressed by the user causing the pivot arm 140 to move around the sliding pivot window
118 and to compress torsional spring. The pivot arm 140 rotates around the dowel pin 120 in
the sliding pivot window 118 and the pivot arm straps 124 move away from the a body
114, which makes room to place the cannula in the aorta in a preferred manner than if the
pivot point were fixed. When the grip pad 116 is released the torsional spring (not shown)
exerts re on the pivot arm strap 124 and temporarily holds the aorta in place. The
straps closes on the aorta and the sliding pivot window 118 allows the pivot point to change
in order to sate for variations in tissue thickness and maintain alignment and
concentricity of pivot arm 140 to a body 114 through the full range of rotation. This
allows the strap 124 to seat uniformly on the aorta. Then, the cable tie is threaded through
the loop 136 and n the guide 142. The cable tie is tightened to a predetermined
tension. One of skill in the art would understand that the cable tie could be replaced with
other mechanisms for securing the pivot arm straps 124. In some embodiments the cable tie
can come preassembled in the loops 136.
Pledgets
In some embodiments, the user may suture surgical felt pledgets on the aorta. The
pledgets serve as an additional measure to retain the aorta on the cannula body 114 because
the pledgets provide a barrier that does not slide between the pivot arm strap 124 and the
cannula body 114. Four sets of two (one inside, one outside) pledgets are equally spaced
around the aorta and sutured. One of skill in the art will recognize that more or fewer
ts may be used. In one embodiment, the aorta is positioned onto the cannula body 114
so that the pledgets are not ly above a space between the pivot arms 140 to prevent the
ts from sliding through the space between the two sides of the pivot arm straps 124. It
will be recognized by one of skill in the art that the pledgets may be placed anywhere on the
aorta and end up in any orientation with respect to the pivot arm straps. The pledgets may be
standard, surgical felt pledgets. Alternatively, they may be injected molded, rigid,
elastomeric pledgets made of a high Durometer material, such as silicone, or a similar
material. One of skill in the art would understand that the ts could be replaced with
other als that attach to the tissue, and that provide an anchor to prevent the device from
sliding between the strap and the cannula body or damaging the tissue. Examples of these
materials include, but are not limited to, a continuous ring of material that attaches to the
tissue or a staple.
Tip Holder
Fig. 6 depicts a tip holder 601. The tip holder 601 is generally cylindrical,
though it may have other shapes. The tip holder has a handle 603. The handle may take any
shape that allows a user to hold the tip holder 601. The tip holder 601 can also have threads
602. The locking nut 102 can be d onto the threads 602. The tip holder 601 can also
have a stopper 604 which protrudes from the tip holder 601 and serves as a stopping point for
the locking nut 102. One of skill in the art would understand that other designs can be used
to attach the g nut to the tip holder. Alternatively, the tip holder may be secured to the
aortic a 100 using other mechanisms known to one skilled in the art. Once secured, the
tip holder can be used to hold the aortic cannula 100 with or without a heart positioned on the
aortic cannula 100.
Example 1
The aortic cannula 100 may be used to connect a heart to an organ chamber
(not shown). The aortic cannula 100 holds the aorta open and in place and allows ate
to be perfused through the heart so the heart can be maintained in near physiologic conditions.
In one embodiment, to deploy the aortic cannula, the user first selects an aortic cannula 100
that is sized to fit the heart. In one embodiment the aortic cannula 100 may be selected by
measuring the aorta. The user depresses the thumb pads 116 on the spring-loaded pivot arms.
When the user depresses the grip pads 116, the pivot arms 140 rotate around the dowel pin
120 within the sliding pivot window 118 and the pivot arm straps 124 move away from the
cannula body 114 making room to place the cannula in the aorta. The user can place the
a in the aorta. Then the user releases the thumb pads allowing the pivot arms 140 to
close on the aorta. The pivot arms 140 may be operated at the same time or individually.
The pressure created by the torsional springs temporarily holds the aorta in place. The user
may adjust the aorta position, if necessary, such that aorta is fully engaged on the cannula
body 114. Next the user places a cable tie through the loops 136 and guides 142 in the pivot
arm straps 124. The user then ns the cable tie to hold the aorta in place. In some
embodiments the cable tie may be tightened using a tool which ns the cable tie to a
predetermined force. The user s the tapered fitting 108 into the organ chamber (not
shown). Then the user tightens the locking nut 102. One of skill in the art will recognize that
in some embodiments the aortic cannula 100 could first be seated in the organ chamber and
then the aorta could be secured to the aortic cannula 100.
Claims (10)
1. An aortic cannula for use in an ex vivo organ care system, the aortic cannula comprising: a cannula body comprising: a fitting configured to connect to the ex vivo organ care system, and an aorta interface configured to contact an aorta; a pivot arm strap operably connected to a pivot mount, wherein the pivot mount is configured to allow the pivot arm strap to uniformly contact the aorta to hold the aorta on the aorta interface; and a spring configured to apply pressure to the pivot arm strap to hold the aorta on the aorta interface.
2. The aortic a of claim 1, further comprising a pivot arm connected to the pivot arm strap and to the pivot mount, such that when the pivot arm is moved toward the cannula body by on around the pivot mount, the pivot arm strap moves away from the cannula body.
3. The aortic cannula of claim 2, wherein the pivot arm and the pivot arm strap are parts of a single piece.
4. The aortic cannula of claim 2, n a dowel pin communicates with the spring to allow the pivot arm to rotate around the dowel pin.
5. The aortic cannula of claim 2, wherein the pivot arm further comprises a grip pad configured to s a top of the pivot arm.
6. The aortic cannula of claim 5, wherein the grip pad is removable.
7. The aortic cannula of claim 1, wherein the pivot arm strap further comprises a loop and a guide, which retain a cable tie around the pivot arm strap.
8. The aortic a of claim 7, further comprising a window sized to normalize compression exerted on the aorta by the cable tie such that, for a given cable tie tension, about a same amount of pressure is exerted on the aorta regardless of a size of the pivot arm strap.
9. The aortic cannula of claim 1, further comprising a connector used to reversibly secure the aortic cannula to an organ chamber.
10. The aortic cannula of claim 9, wherein the connector is a threaded locking nut.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201562215825P | 2015-09-09 | 2015-09-09 | |
US62/215,825 | 2015-09-09 | ||
PCT/US2016/050512 WO2017044465A1 (en) | 2015-09-09 | 2016-09-07 | Aortic cannula for ex vivo organ care system |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ739881A NZ739881A (en) | 2021-10-29 |
NZ739881B2 true NZ739881B2 (en) | 2022-02-01 |
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