WO2008033196A1 - Multilayer balloon for bifurcated stent delivery and methods of making and using the same - Google Patents

Multilayer balloon for bifurcated stent delivery and methods of making and using the same Download PDF

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Publication number
WO2008033196A1
WO2008033196A1 PCT/US2007/017883 US2007017883W WO2008033196A1 WO 2008033196 A1 WO2008033196 A1 WO 2008033196A1 US 2007017883 W US2007017883 W US 2007017883W WO 2008033196 A1 WO2008033196 A1 WO 2008033196A1
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WO
WIPO (PCT)
Prior art keywords
balloon
outer layer
inner layer
layer
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2007/017883
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English (en)
French (fr)
Inventor
Stefan M. Pallazza
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boston Scientific Ltd Barbados
Boston Scientific Scimed Inc
Original Assignee
Boston Scientific Ltd Barbados
Scimed Life Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boston Scientific Ltd Barbados, Scimed Life Systems Inc filed Critical Boston Scientific Ltd Barbados
Priority to EP07836752.1A priority Critical patent/EP2061403B1/en
Priority to CA002658437A priority patent/CA2658437A1/en
Priority to JP2009527351A priority patent/JP5486307B2/ja
Publication of WO2008033196A1 publication Critical patent/WO2008033196A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2/954—Instruments specially adapted for placement or removal of stents or stent-grafts for placing stents or stent-grafts in a bifurcation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2/958—Inflatable balloons for placing stents or stent-grafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/856—Single tubular stent with a side portal passage
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2002/821—Ostial stents

Definitions

  • the present invention relates to the field of expandable balloon members, particularly those for delivery of medical devices, particularly those delivered at or near a bifurcation of a body lumen.
  • Vascular disease is prevalent and often involves the development of a stenosis within a body vessel which causes narrowing of the vessel, or which can lead to complete blockage (or occlusion), which leads to restriction or cessation of blood flow through this vessel.
  • a bifurcation is an area of the vasculature or other portion of the body where a first (or parent) vessel is bifurcated into two or more branch vessels.
  • the lesion(s) can affect only one of the vessels (i.e., either of the branch vessels or the parent vessel) two of the vessels, or all three vessels.
  • Implantable medical devices such as stents, are well known, and may be designed for treatment at vessel bifurcations.
  • Stents are implantable devices which are introduced percutaneously, delivered transluminally to the treatment site in a reduced diameter profile, and once in position, are radially expanded to an enlarged diameter.
  • Stents may be implanted in a variety of body lumens or vessels such as within the vascular system, urinary tracts, bile ducts, fallopian tubes, coronary vessels, secondary vessels, etc.
  • Stents may be used to reinforce body vessels and to prevent restenosis following angioplasty in the vascular system. They may be self-expanding, expanded by an internal radial force, such as when mounted on a balloon, or a combination of self- expanding and balloon expandable (hybrid expandable).
  • a stent is typically delivered using a stent delivery device, such as a stent delivery catheter.
  • a stent delivery device such as a stent delivery catheter.
  • the stent is crimped down to its delivery position over an expandable member, which is disposed at the distal end of the delivery catheter.
  • the delivery catheter, with the expandable element and the stent disposed thereon, is advanced to the treatment site, wherein the balloon and the catheter are expanded, the expandable member deflated and withdrawn, leaving the stent deployed at the site.
  • Stents for use at vessel bifurcations may have a variety of configurations including, for example, segmented structures which include a primary branch and at least one secondary branch which is positioned adjacent to and/or partially within the primary branch. These segmented systems may employ multiple catheters and/or balloons to deploy all of the stent segments.
  • bifurcated stents include single structure stents wherein the stent is comprised of a trunk with two or more branches extending therefrom.
  • Still other stent configurations employ a single substantially tubular stent which has a specialized side-branch opening through which an additional stent or structural component may be deployed.
  • Many of these systems employ a stent delivery assembly having a dual-balloon system for deployment of the main and the side-branch of the bifurcation stent.
  • the present invention relates to expandable medical balloons useful for delivery of implantable medical devices at vessel bifurcations.
  • the present invention relates to a single expandable medical balloon which is configured so as to allow for deployment of a bifurcation stent which has both main and side-branch openings.
  • the present invention relates to an expandable medical balloon useful for treatment of a bifurcated vessel, the balloon having at least one expanded state, the balloon formed with at least one inner layer and at least one outer layer, the outer layer having at least one cavity wherein the cavity extends at least partially through the outer layer and allows protrusion of the inner layer therethrough when the balloon is in its at least one expanded state.
  • the cavity extends completely through the outer layer thereby forming an opening through which the inner layer is exposed.
  • the cavity is suitably located in the balloon body.
  • the balloon is formed having at least one inner layer and at least one outer layer, wherein the outer layer has at least one protrusion region, the outer layer of the protrusion region having at least a partial thickness.
  • the balloon is employed for the delivery of a bifurcated stent having a main branch and a side branch, wherein the inner layer protrusion corresponds with and extends into, the side branch of the bifurcated stent for expansion of the side branch.
  • Using a single multilayer balloon according to the invention allows for a more simplistic approach to stent delivery at vessel bifurcations than use of a dual- balloon system, for example.
  • FIG. 1 is a longitudinal cross-section of an embodiment of a balloon in an unexpanded or static state in accordance with the invention.
  • FIG. IA is a radial cross-section taken at section IA-I A in FIG. 1.
  • FIG. 2 is a longitudinal cross-section of a balloon similar to that shown in FIGS. 1 and IA in an expanded state.
  • FIG. 2A is a radial cross-section taken at section 2A-2A in FIG. 2.
  • FIG. 3 is a perspective view of a generic stent having a main and a side- branch opening for use at a vessel bifurcation.
  • FIG. 4 is a side view of a stent similar to that shown in FIG. 3 disposed about an embodiment of a balloon according to the invention, each in their expanded configuration in an environment of use.
  • FIG. 5 is a partial longitudinal cross-section of a multilayer preform for a balloon.
  • FIG. 6 is a longitudinal cross-section of a balloon formed from a multilayer preform similar to that in FIG. 5 in a static state.
  • FIG. 7 is a partial longitudinal cross-section of a portion of a multilayer balloon body as in FIG. 6 after removal of material from the outer layer.
  • FIG. 8 is a longitudinal cross-section of an expandable balloon member formed as in FIGS. 5-7 in an expanded state.
  • FIG. 9 is a partial longitudinal cross-section of a multilayer preform for a balloon.
  • FIG. 10 is a partial longitudinal cross-section of a portion of a multilayer balloon body after removal of material from the outer layer of a balloon preform similar to that in FIG. 9.
  • FIG. 11 is a longitudinal cross-section of an expandable balloon member formed as in FIGS. 9-10 in an expanded state.
  • the present invention relates to a multilayer expandable medical balloon which finds particular utility for use in treatment of vessel bifurcations and for delivery of stents for treatment at a vessel bifurcation.
  • the balloon includes at least one inner layer and at least one outer layer, the outer layer having a cavity extending at least partially therethrough.
  • the cavity may extend all the way through the outer layer forming an opening through which the outer surface of the inner layer is exposed. In one embodiment, the cavity extends completely through the outer layer thereby forming an opening through which the inner layer is exposed. The cavity allows the inner layer to expand therethrough. More specifically, the balloon is formed having at least one inner layer and at least one outer layer, wherein the outer layer has at least one protrusion region, the outer layer of the protrusion region having at least a partial thickness.
  • the expandable balloons according to the invention find particular utility for delivery of an implantable medical device such as a stent having a main and a side- branch for use at a vessel bifurcation, wherein the balloon is employed to expand the stent from its unexpended configuration to its expanded configuration during deployment.
  • an implantable medical device such as a stent having a main and a side- branch for use at a vessel bifurcation, wherein the balloon is employed to expand the stent from its unexpended configuration to its expanded configuration during deployment.
  • the main branch of the stent may be positioned in the main branch of the vessel bifurcation.
  • the side-branch of the stent may be positioned at the secondary or side-branch of the vessel bifurcation.
  • the stent may be positioned over the balloon so that the side-branch opening of the stent is positioned over the cavity in the outer layer of the balloon.
  • the at least one inner layer of the multi-layer balloon expands into the cavity of the at least one outer layer, and protrudes therethrough, thereby expanding the side-branch of the stent into the ostium of the secondary vessel of the vessel bifurcation.
  • FIG. 1 is a longitudinal cross-section of a balloon 10 in an unexpanded or static state in accordance with the invention.
  • the term "static" shall be used to refer to the balloon as it is formed, prior to either deflation or expansion.
  • the static state is the state of the balloon as it is removed from the balloon mold.
  • balloon 10 is shown having waist portions 12, cone portions 14 and body portion 16.
  • Balloon is of a multilayer construction having at least one inner layer 18 and at least one outer layer 20.
  • the inner layer has an inner surface 17 and an outer surface 19.
  • Outer layer 20 has a cut-out region or cavity 22 extending therethrough such that the outer surface 19 of the inner layer 18 is exposed in the region.
  • FIG. IA is a radial cross-section taken at section 1 A-IA in FIG. 1.
  • FIG. 2 is a longitudinal cross-section of a balloon 10 similar to that shown in FIGS. 1 and IA in an expanded state. In the expanded state, the inner layer 18 is shown with a protrusion 24 extending through cavity 22 (shown in FIGS. 1 and IA).
  • FIG. 2A is a radial cross-section taken at section 2A-2A in FIG. 2.
  • protrusion in FIG. 2 is shown having a generally half-circular or elliptical shape, it may take on other geometries as well if so desired.
  • Balloon 10 shown in FIGS. 1, IA, 2 and 2A find particular utility for delivery of a stent having a main and a side-branch opening which can be employed at vessel bifurcations.
  • Stent 30 may be formed of wire or metal mesh wrapped into a cylindrical shape, or may be formed from a tubular member with strut patterns cut therein, or may be formed from a sheets of material which are wrapped or rolled into a cylindrical shape and the edges secured together using any suitable method known in the art.
  • a stent pattern may be cut into the sheet before or after rolling. The present invention is not limited to any particular stent configuration.
  • Stent 30 is shown having a primary or main stent body 40 which is formed of a plurality of interconnected stent members 32 which define a plurality of openings 34 which extend through the body 40, and which are in fluid communication with the primary lumen 36 of the stent body 40. Stent 30 is further configured with an opening 42 different from the other stent openings 34. Opening 42 is the side-branch opening of the stent. When the stent 30 is advanced to a vessel bifurcation, side-branch opening 42 will be aligned with the ostium of a secondary branch vessel adjacent the main vessel of a vessel bifurcation.
  • FIG. 4 is a side view of a stent mounted on the expandable balloon member 10 shown disposed about the distal end of an inner catheter shaft 44 and the distal end of an outer catheter shaft 46 and is shown in a bifurcated vessel 50.
  • Vessel 50 is shown having a side branch 6 and a main branch 8.
  • Balloon 10 has an inner layer and an outer layer as shown in FIGS. 1, IA, 2 and 2 A.
  • Outer layer has an cavity as shown in FIGS. 1, IA, 2 and 2A which, in an expanded state, the inner layer expands therethrough forming a protrusion 24.
  • the protrusion 24 can be used to expand the side branch 42 of stent 30 into side branch 6 of vessel 50.
  • Multilayer balloon 10 may be made using any conventional balloon forming techniques known to those of skill in the art.
  • One commonly employed method includes the basic steps of extruding a tubular parison or balloon preform, placing the tubular parison in a balloon mold, and expanding the tubular parison into the desired balloon configuration in the balloon mold.
  • the main processing steps may include other steps therein such as stretching and radial orientation of the balloon material, for example, as well as annealing and heat setting, if desired.
  • the tubular parison may be stretched prior to molding, for example, in a separate step.
  • the stretching step may also be combined with the radial expansion step while the tubular parison is in the balloon mold.
  • An example of a balloon forming process is disclosed in US Patent No. 4,490,421 which is incorporated by reference herein in its entirety. Other suitable methods are known in the art.
  • FIGS. 5-8 illustrate one embodiment of a method of making an expandable multilayer balloon.
  • a tubular multilayer balloon preform 15 as shown as a partial longitudinal cross-section in FIG. 5, may be formed as is known in the art such as by coextrusion.
  • Balloon preform 15 has an inner layer 18 and an outer layer 20.
  • the inner layer 18 has an inner surface 17 and an outer surface 19.
  • the balloon preform 15 may then be placed in a balloon mold and radially expanded as is known in the art to form a balloon 100 as shown in FIG. 6. As balloon 100 is removed from the mold, it is considered to be in its static state.
  • the outer layer 20 is continuous with the inner layer 18.
  • cavity 22 in the outer layer 20 As shown as an expanded partial longitudinal cross-section of balloon body 16, material may be removed from the balloon 100 using any suitable technique such as by laser ablation, grinding, chemical etching, etc. wherein the cavity 22 in the outer layer is an opening extending therethrough with the outer surface 19 of the inner layer 18 of the balloon 100 exposed.
  • cavity 22 may also be of a partial thickness.
  • Laser ablation methods are known and disclosed in, for example, commonly assigned US Patent No. 5826588 which is incorporated by reference herein in its entirety.
  • a second forming processing may be employed to create the final balloon 10 shown as a partial longitudinal cross-section in FIG. 8 by placing balloon 100 in a mold and radially expanding to form the final balloon 10 as shown in FIG. 8.
  • the balloon 10 is removed from the mold in its static state, i.e. prior to expansion or deflation.
  • the cavity (not shown) allows the inner layer 18 to expand outwardly into a bulge 24. This can be advantageously employed to expand a side-branch of a bifurcated stent as explained above.
  • the second forming process may not be necessary as protrusion of the inner layer may occur when the balloon is pressurized.
  • the multilayer tubular parison 15 is formed using any suitable technique as described above such as by coextrusion.
  • a partial longitudinal cross-section of multilayer tubular parison 15 having an inner layer 18 and an outer layer 20 is shown in FIG. 9.
  • the inner layer 18 has an inner surface 17 and an outer surface 19.
  • the tubular parison may first be formed using any method known in the art such as coextrusion of the layered parison, or tube-in-tube methods wherein tubes are first formed, and then inserted one in another.
  • material may then be removed from the tubular parison 15 leaving a cavity 22 in the outer layer 20 which is of a partial thickness, or which extends all the way through the outer layer and forming an opening through which the outer surface of the inner layer is exposed. Removal of material may be accomplished using any suitable technique such as by laser ablation, chemical etching, grinding, etc. as is known in the art.
  • ILC intermittent layer coextrusion
  • Tubular parison 15 may then be placed into a balloon mold, and radially expanded resulting in balloon 10 as shown in FIG. 11.
  • a heat set step may be employed if desired.
  • the balloon may be folded and wrapped about its longitudinal axis as is known in the art.
  • the geometry of the protrusion can be changed by changing the geometry within the balloon mold.
  • the process above can be modified so as to provide two or more cavities in the outer layer and two or more protrusions into the cavities from the inner layer.
  • the layers may be formed using other methods known in the art.
  • the tubular parison may be formed of a single layer, and subsequent layers may be applied using other techniques such as by chemical treatment, polymerization of an outer layer on the first, ion bombardment, etc.
  • a single layer balloon may also be formed followed by chemical treatment, polymerization of an outer layer, ion bombardment, etc.
  • the outer layer is formed from a material which is different than that of the inner layer.
  • the at least one inner layer is made from a material which has a different compliance than that of the outer layer, i.e. is either more compliant or less compliant than the outer layer.
  • the material for the outer layer is selected so as to be of the compliance desired for deployment of a stent in a main branch vessel.
  • suitable balloon materials for the outer layer include, but are not limited to, polyolefins such as polyethylene, polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and polyamides (nylons), for example, are commonly employed for deployment of a stent in a main branch vessel.
  • Materials which may form compliant or semi-compliant balloon layers are those which are relatively soft or flexible polymeric materials.
  • these materials include, but are not limited to, polyethylene (high density, low density, intermediate density, linear low density), various copolymers and blends of polyethylene, ionomers, polyesters, polyurethanes, polycarbonates, polyamides, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymers, polyether-polyester copolymers, polyether-polyamide copolymers, block copolymers having styrene endblocks and midblocks of isoprene, butadiene, ethylene/propylene, isobutylene and ethylene/butylene, PTFE (TEFLON®), polyester-ester elastomers, polyether-ester elastomers such as HYTREL® and ARNITEL®, polyether-ether ketone (PEEK), polyether-block amides (PEBA
  • intermediate compliance balloons may be made polymers such as polyethylene ionomer, polyvinyl chloride, polyethylene or ethylene- vinyl acetate, nylon, polyether-block amides, and styrenic block copolymers, for example, as well as mixtures thereof
  • Materials which may form relatively non-compliant balloon layers may be formed from relatively rigid or stiff polymeric materials. These materials include thermoplastic polymers and thermoset polymeric materials. Some examples of such materials include, but are not limited to, the polyalkylene terephthalates such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyimides, thermoplastic polyimides, polyamides, polyesters, polycarbonates, polyphenylene sulfides, polypropylene, rigid polyurethanes as well as mixtures thereof.
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • polyimides thermoplastic polyimides
  • polyamides polyamides
  • polyesters polycarbonates
  • polyphenylene sulfides polypropylene
  • rigid polyurethanes as well as mixtures thereof.
  • some classes of materials such as polyethylene or polyamides, for example, have members which fall into one or more of the compliance categories, depending on their chemical composition, chemical structure and processing parameters to which they are subjected, for example.
  • Non-limiting examples of balloon materials may be found in commonly assigned U.S. Patent Nos. 5500181, 5403340 and 5348538, each of which is incorporated by reference herein in its entirety.
  • either layer may include reinforcement materials.
  • reinforcement materials include fiber or filament forms such as polyester, polyamide or carbon fiber, and further may be sphere and particulate forms such as glass.
  • reinforcing materials include, but are not limited to, glass, carbon, ceramic, fluoropolymer, graphite, liquid crystal polymers, polyester, polyamide, stainless steel, titanium and other metals such as nitinol, or radiopaque materials (such as Bismuth or Tungsten) and the like.
  • Reinforcement materials are disclosed in commonly assigned U.S. Patent No. 6024722, the entire content of which is incorporated by reference herein.
  • Nanocomposite or microcomposite materials may be employed herein.
  • “Nanocomposite” or “microcomposite” are terms art often used to refer to compositions that include a polymeric material and relatively small amounts (generally less than about 10% by weight) of nanometer-sized (average size smaller than 1 micrometer) mineral clay or nanosized ceramic particles dispersed therein, for example.
  • nanocomposites are referred to as “nanoclay” or “nanoceramic”.
  • nanocomposites are disclosed in commonly assigned copending WO 03/049795 A2, the entire content of which is incorporated by reference herein. See also WO 930004118, commonly assigned U.S. Patent Application No. 20050149177, and U.S. Pat. Nos.
  • Radiopaque materials may be added to provide a visual aid for positioning of the balloon and/or stent at the treatment site in a body lumen, for example.
  • the expandable balloon members according to the invention find utility in the treatment of vascular disease, particularly for the treatment of disease at vessel bifurcations.
  • Procedures wherein such balloons may be employed include, for example, plain old balloon angioplasty (POBA) and percutaneous transluminal coronary angioplasty (PTCA), as well as delivery of implantable medical devices such as stent delivery.
  • POBA plain old balloon angioplasty
  • PTCA percutaneous transluminal coronary angioplasty
  • implantable medical devices such as stent delivery.
  • the multilayer expandable balloon members as disclosed herein allow for delivery of stents at vessel bifurcations using a single balloon member.
  • the use of a single balloon member is advantageous for a variety of reasons including easier, more efficient assembly, easier balloon folding/wrapping and crimping of the stents onto the balloon and reduced withdrawal force post-stent deployment.
  • the multilayer expandable balloon members can be employed in combination with any catheter assembly used for vascular treatment and in combination with any stent delivery device employed in such treatments.
  • the inner diameter of the coextruded tubular parison was 0.023" and the outer diameter of 0.046".
  • the inner layer and outer layer were extruded at equal mass flow rates.
  • the extruder was employed with several heating zones ranging from about 350° F (about 177° C) to about 515° F (about 268° C).
  • a balloon was formed by placing the tubular parison in a conventional balloon mold form such as disclosed in commonly assigned U.S. Patent No. 5,714,110 to Wang (see FIG. 4), the entire content of which is incorporated by reference, and radially expanding the tubular parison into the mold form at a temperature of 95° C and 350 psi (about 2.40 megapascal).
  • the balloon dimensions were 3.0 mm x 24.0 mm. After radial expansion in the balloon mold, the thickness of the outer layer is slightly less than the thickness of the inner layer.
  • a substantially circular section having a diameter of about 1.5 mm was cut into the outer layer of the balloon with a UV laser, forming an opening extending all the way through the outer layer, exposing the outer surface of the inner layer.
  • the main branch portion of the balloon was expanded. After inflation to 15 atm, the inner layer expanded through the opening to form a protrusion, i.e. the size branch portion of the balloon.
  • inflation pressures may vary depending on the materials selected, processing parameters, and balloon wall thickness.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
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PCT/US2007/017883 2006-09-12 2007-08-14 Multilayer balloon for bifurcated stent delivery and methods of making and using the same Ceased WO2008033196A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07836752.1A EP2061403B1 (en) 2006-09-12 2007-08-14 Multilayer balloon for bifurcated stent delivery and methods of making and using the same
CA002658437A CA2658437A1 (en) 2006-09-12 2007-08-14 Multilayer balloon for bifurcated stent delivery and methods of making and using the same
JP2009527351A JP5486307B2 (ja) 2006-09-12 2007-08-14 分岐したステント搬送用の多層からなる拡張可能な医療用バルーン及びその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/519,420 US8216267B2 (en) 2006-09-12 2006-09-12 Multilayer balloon for bifurcated stent delivery and methods of making and using the same
US11/519,420 2006-09-12

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WO2008033196A1 true WO2008033196A1 (en) 2008-03-20

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US (2) US8216267B2 (enExample)
EP (1) EP2061403B1 (enExample)
JP (1) JP5486307B2 (enExample)
CA (1) CA2658437A1 (enExample)
WO (1) WO2008033196A1 (enExample)

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US10881426B2 (en) 2011-10-07 2021-01-05 W. L. Gore & Associates, Inc. Balloon assemblies having controllably variable topographies

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US6863678B2 (en) 2001-09-19 2005-03-08 Advanced Cardiovascular Systems, Inc. Catheter with a multilayered shaft section having a polyimide layer
US7147661B2 (en) 2001-12-20 2006-12-12 Boston Scientific Santa Rosa Corp. Radially expandable stent
WO2007075585A2 (en) 2005-12-16 2007-07-05 Interface Associates, Inc. Multi-layer balloons for medical applications and methods for manufacturing the same
US7828766B2 (en) 2005-12-20 2010-11-09 Advanced Cardiovascular Systems, Inc. Non-compliant multilayered balloon for a catheter
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US9492297B2 (en) 2016-11-15
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US20120265284A1 (en) 2012-10-18
CA2658437A1 (en) 2008-03-20
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US8216267B2 (en) 2012-07-10
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