US20030135266A1 - Apparatus and methods for delivery of multiple distributed stents - Google Patents

Apparatus and methods for delivery of multiple distributed stents Download PDF

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Publication number
US20030135266A1
US20030135266A1 US10306813 US30681302A US2003135266A1 US 20030135266 A1 US20030135266 A1 US 20030135266A1 US 10306813 US10306813 US 10306813 US 30681302 A US30681302 A US 30681302A US 2003135266 A1 US2003135266 A1 US 2003135266A1
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Prior art keywords
catheter
prostheses
sheath
stents
method
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Abandoned
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US10306813
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Sunmi Chew
Bernard Andreas
Hanson Gifford
Ron French
Mark Deem
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Xtent Inc
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Xtent Inc
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/95Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2/958Inflatable balloons for placing stents or stent-grafts
    • AHUMAN NECESSITIES
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    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00Filters 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
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
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    • A61F2/00Filters 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
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    • A61F2/00Filters 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
    • A61F2/95Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2/962Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
    • A61F2/966Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
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    • A61F2/00Filters 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
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    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91533Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other characterised by the phase between adjacent bands
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    • A61F2/00Filters 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
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91533Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other characterised by the phase between adjacent bands
    • A61F2002/91541Adjacent bands are arranged out of phase
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    • A61F2/00Filters 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
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    • A61F2/915Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
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    • A61F2250/0058Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0071Additional features; Implant or prostheses properties not otherwise provided for breakable or frangible

Abstract

Blood vessels and other body lumens are stented using multiple, discreet stent structures. Stent structures may be balloon expandable or self-expanding and are delivered by a delivery catheter which is repositioned to spaced-apart delivery sights. By coating the stents with particular biologically active substances, hyperplasia within and between the implanted stents can be inhibited. An exemplary delivery catheter comprises a catheter body having both a pusher rod for advancing the stents relative to a sheath and a reciprocatable delivery catheter for implanting the stents.

Description

    CROSS-REFERENCES TO RELATED APPLICATIONS
  • The present application is a non-provisional of U.S. Patent Application Serial Nos. 60/336,967 (Attorney Docket No. 021629-000300) filed Dec. 3, 2001, and is also a non-provisional of U.S. Patent Application Serial No. 60/364,389 (Attorney Docket No. 021629000310) filed on Mar. 13, 2002, the full disclosures of which are incorporated herein by reference.[0001]
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0002]
  • The present invention relates generally to medical devices and methods. More particularly, the present invention relates to apparatus and methods for independently delivering a plurality of luminal prostheses within a body lumen, such as a blood vessel. [0003]
  • Coronary artery disease is the leading cause of death and morbidity in the United States and Western society. In particular, atherosclerosis in the coronary arteries can cause myocardial infarction, commonly referred to as a heart attack, which can be immediately fatal or, even if survived, can cause damage to the heart which can incapacitate the patient. [0004]
  • While coronary artery bypass surgery can be an effective treatment for stenosed arteries resulting from atherosclerosis or other causes, it is a highly invasive, costly procedure, which typically requires substantial hospital and recovery time. Percutaneous transluminal coronary angioplasty, commonly referred to as balloon angioplasty, is less invasive, less traumatic, and significantly less expensive than bypass surgery. Heretofore, however, balloon angioplasty has not been considered as effective a treatment as bypass surgery. The effectiveness of balloon angioplasty, however, has improved significantly with the introduction of stenting which involves the placement of a scaffold structure within the artery which has been treated by balloon angioplasty. The stent inhibits abrupt reclosure of the artery and has some benefit in inhibiting subsequent restenosis resulting from hyperplasia. Recently, experimental trials have demonstrated that the coating of stents using anti-proliferative drugs, such as paclitaxel, can significantly reduce the occurrence of hyperplasia in angioplasty treated coronary arteries which have been stented with the coated stents. [0005]
  • While the combination of balloon angioplasty with drug-coated stents holds great promise, significant challenges still remain. Of particular interest to the present invention, the treatment of extended or disseminated disease within an artery remains problematic. Most stents have a fixed length, typically in the range from 10 mm to 30 mm, and the placement of multiple stents to treat disease over a longer length requires the suggestive use of balloon stent delivery catheters. Moreover, it can be difficult to stent an angioplasty-treated region of a blood vessel with the optimum stent length. [0006]
  • For these reasons, it would be desirable to provide improved stents, stent delivery systems, stenting methods, and the like, for the treatment of patients having coronary artery disease, as well as other occlusive diseases of the vasculature. In particular, it would be desirable to provide stents, delivery systems, and methods for the treatment of disseminated and variable length stenotic regions within the vasculature. For example, it would be desirable to provide a practical method which permits a physician to optimize the length of the treated vessel which is stented according to the nature of the disease. More specifically, it would be desirable to provide apparatus, systems, and methods for facilitating the delivery of multiple stents and other prostheses to blood vessels or other target body lumens. Such apparatus, systems, and methods should be suitable for delivery of individual stents or prostheses having very short lengths, typically as short as 3 mm or shorter, at multiple contiguous and non-contiguous locations within a body lumen for optimized treatment thereof. At least some of these objectives will be met by the inventions described hereinafter. [0007]
  • 2. Description of the Background Art. [0008]
  • U.S. Pat. No. 6,258,117 B1 describes a stent having multiple sections connected by separable or frangible connecting regions. Optionally, the connecting regions are severed after the stent structure has been implanted in the blood vessel. U.S. Pat. Nos. 5,571,086; 5,776,141; and 6,143,016 describe an expandable sleeve for placement over a balloon catheter for the delivery of one or two stent structures to the vasculature. U.S. Pat. No. 5,697,948 describes a catheter for delivering stents covered by a sheath. [0009]
  • BRIEF SUMMARY OF THE INVENTION
  • The present invention provides methods and apparatus for prosthesis placement, such as stenting of body lumens, typically blood vessels, and more typically coronary arteries. The methods and systems will also find significant use in the peripheral vasculature, the cerebral vasculature, and in other ducts, such as the biliary duct, the fallopian tubes, and the like. The terms “stent” and “stenting” are defined to include any of the wide variety of expandable prostheses and scaffolds which are designed to be intraluminally introduced to a treatment site and expanded in situ to apply a radially outward force against the inner wall of the body lumen at that site. Stents and prostheses commonly comprise an open lattice structure, typically formed from a malleable or elastic metal. When formed from a malleable metal, the stents will typically be expanded by a balloon which causes plastic deformation of the lattice so that it remains opened after deployment. When formed from an elastic metal, including super elastic metals such as nickel-titanium alloys, the lattice structures will usually be radially constrained when delivered and deployed by releasing the structures from such radial constraint so that they “selfexpand” at the target site. When the stent or lattice structures are covered with a fabric or polymeric membrane covering, they are commonly referred to as grafts. Grafts may be used for the treatment of aneurysms or other conditions which require placement of a non-permeable or semi-permeable barrier at the treatment site. The terms “prosthesis” and “prostheses” refer broadly to all radially expansible stents, grafts, and other scaffold-like structures which are intended for deployment within body lumens. [0010]
  • The stents and prostheses of the present invention may have any of a variety of common constructions, including helical structures, counterwound helical structures, expandable diamond structures, serpentine structures, or the like. Such conventional stent structures are well described in the patent and medical literature. Specific examples of suitable stent structures are described in the following U.S. patents, the full disclosures of which are incorporated herein by reference: U.S. Pat. Nos. 6,315,794; 5,980,552; 5,836,964; 5,527,354; 5,421,955; 4,886,062; and 4,776,337, the full disclosures of which are incorporated herein by reference. Preferred structures are described herein with reference to FIGS. 4 and 5. [0011]
  • According to the present invention, the stents which are deployed may have a length of 1 mm or greater, usually 2 mm or greater, and typically of 3 mm or greater, usually being in the range from 1 mm to 100 mm, typically from 2 mm to 50 mm, more typically from 2 mm to 25 mm, and usually from 3 mm to 20 mm. The use of such short stent lengths is advantageous since multiple stents are to be employed. [0012]
  • The methods and apparatus of the present invention will provide for the deployment of a plurality of stents or other prostheses, usually including at least two stents, from a common stent delivery catheter. Usually, the number of delivered stents will be in the range from 2 to 50, typically from 3 to 30, and most typically from 5 to 25. As more stents are placed on the delivery catheter, the individual stent length will often be somewhat less, although this is not necessarily the case in all instances. The multiple prostheses may be deployed individually or in groups of two or more at single or multiple spaced-apart locations in the body lumen or lumens. [0013]
  • In a first aspect of the present invention, a method for stenting an extending length of a body lumen comprises introducing a catheter carrying a plurality of, usually at least two, discrete stents to the body lumen. Usually, the introduction is percutaneous and, in the case of intravascular delivery, uses a conventional introduction technique, such as the Seldinger technique. After reaching a target location, at least a first stent is released from the catheter at that first location. The catheter is then repositioned to a second location, and at least a second stent is released from the catheter at the second location. The catheter is then repositioned to a third location, and at least a third stent is released from the catheter at the third location [0014]
  • In addition to deploying stents and other prostheses at spaced-apart locations within a blood vessel or other body lumen, the methods and apparatus in the present invention can be used for delivering one, two, three, or more discrete stents or other prosthesis segments contiguously at a single location within the body lumen. In this way, the length of the prosthesis which is implanted can be selected and modified to accommodate the length of the vessel to be treated. It will be appreciated that with systems which carry 10, 20, 30 or more quite short prostheses or prosthesis segments, the length of the lumen being treated can be tailored very closely from very short to very long with the selectable intervals depending on the length of the prosthesis or prosthesis segment. [0015]
  • The deployment steps can, of course, be repeated a sufficient number of times so that all or at least more of the stents carried by the delivery catheter are delivered to and deployed within the body lumen. A particular advantage of this delivery method is that the discrete stents may be distributed along extended lengths of the body lumen, typically in the range from 1 cm to 2 cm, often in the range from 1 cm to 5 cm, and in many instances even longer. Additionally, the stents may be delivered so as to avoid side branches or other regions where placement of the stent is undesirable. Moreover, with the use of drug-coated stents, it may be possible to place the stents apart by discrete distances, typically from one-half to one millimeter (mm), while still achieving vessel patency and hyperplasia inhibition. [0016]
  • Releasing of the stents from the catheter may be achieved using a balloon to cause balloon expansion of the stent. Alternatively, release of the stent may be achieved by radially constraining an elastic or self-expanding stent within a lumen of the delivery catheter and selectively advancing the stent from the catheter and/or retracting the catheter from over the stent. In one embodiment, a sheath over the stents includes a valve member, or “stent valve,” which allows stents to be separated so that a balloon can more accurately inflate deployed stents while other stents remain within the sheath. [0017]
  • In preferred embodiments, the stents are coated with at least one agent, such as an agent which inhibits hyperplasia. The agent may be biologically active or inert. Particular biologically active agents include anti-neoplastic drugs such as paclitaxel, methotrexate, and batimastal; antibiotics such as doxycycline, tetracycline, rapamycin, and actinomycin; immunosuppressant such as dexamethosone, methyl prednisolone, nitric oxide sources such as nitroprussides; estrogen; estradiols; and the like. Biologically inert agents include polyethylene glycol (PEG), collagen, polyglycolic acids (PGA), ceramic material, titanium, gold and the like. [0018]
  • In another aspect, the present invention comprises catheters and apparatus for stenting extended lengths of a body lumen, particularly a blood vessel. The catheters comprise a catheter body having a proximal end and a distal end. At least two discrete stents are carried at or near a distal end of the catheter body. By “discrete,” it is meant that the stents are unconnected and can be deployed from the catheter in an unattached manner. (The delivery of attached prostheses is described below.) Deployment of such discrete stents permits the individual stents to be placed at spaced-apart target locations or immediately adjacently within the blood vessel or other body lumen. The catheters further comprise deployment means for deploying the individual stents from the catheter body. For example, the deployment means may comprise one or more balloons for placement and radial expansion of the stents. Alternatively, the deployment means may comprise a pusher or other device for advancing self-expanding stents from the distal end of the catheter body and/or a sheath for selectively retracting over the stents to permit self-expansion. In exemplary embodiments, the catheters will carry at least two discrete stents, at least five discrete stents, and as many as 10 discrete stents, or in some cases, as many as 30 or more discrete stents. [0019]
  • In a particular embodiment, the catheter comprises a single balloon which is reciprocatively mounted within the catheter body and adapted for receiving individual stents thereover. A pusher or other device for successively and controllably loading individual or multiple stents over the balloon is also provided. In this way, the catheter may carry multiple stents and employ the single balloon for positioning and expansion of the stents. [0020]
  • In further embodiments, the stents of the present invention are composed at least partly of a bioabsorbable material, such as polyethylene glycol (PEG), collagen, gelatin, polyglycolic acids (PGA), polylactic acids (PLA), and the like. Optionally, one or more bioactive substances are dispersed in the bioabsorbable material such that the bioactive substance will be released over time as the bioabsorbable material degrades. In a particular embodiment, the bioabsorbable material is formed on or within a scaffold composed on a non-bioabsorbable material, typically stainless steel, Nitinol™, or other conventional stent metal material. Other materials, such as gold (e.g., pure or nearly pure gold), platinum, or the like, may also be used. [0021]
  • In a further aspect of the present invention, a catheter for delivering a plurality of expansible prostheses to a body lumen comprises a catheter body, a sheath, and a plurality of radially expansible prostheses. The catheter body has a proximal end and a distal end, and the sheath is coaxially disposed over the catheter body with the prostheses positionable in an annular space between the inside of the sheath and the exterior of the catheter body. The sheath is preferably retractable relative to the catheter body so that the prostheses may be advanced beyond a distal end of the sheath. Usually, the catheter will further comprise a pusher tube disposed coaxially over the catheter body and within an interior lumen of the sheath. A distal end of the pusher tube will engage a proximal end of the proximal-most prosthesis so that the pusher tube can be distally advanced relative to the sheath to selectively push or deploy individual prostheses from the sheath. Often, such deployment is achieved by holding the pusher tube and prostheses substantially stationary relative to the body lumen while the sheath is retracted proximally to release or deploy the prostheses. [0022]
  • Usually, at least a distal portion of the sheath will have a greater column strength than that of a distal portion of the catheter body. Additionally or alternatively, the pusher tube may also have a greater column strength than a distal portion of a catheter body. By providing column strength in the outer most portion of the catheter, i.e., the sheath, and optionally the pusher tube, the overall column strength of the catheter can be increased with a minimum increase in its diameter or profile. It will be appreciated that low profile catheters are highly advantageous for accessing remote regions of the vasculature, particularly the small coronary and cerebral arteries. Using the preferred constructions of the present invention, catheters having diameters 2 mm or less, and in some instances as low as 1 mm or less, can be achieved. The constructions will, of course, also be suitable for larger diameter catheters for use in the peripheral and other larger blood vessels. [0023]
  • The catheter of the present invention will preferably carry at least two prostheses, more preferably carrying at least three prostheses, and often carrying a greater number of prostheses as set forth above in connection with other embodiments. The prostheses will typically be arranged in an end-to-end manner either with or without a physical linkage therebetween. The physical linkage may comprise a frangible component which must be mechanically broken or alternatively may comprise a pair of coupling elements which fit together and which may be separated without any material breakage. Frangible coupling elements will usually comprise a strut, bar, spring, or similar connecting link and will optionally be scored, notched, or otherwise adapted to break along a particular line when a suitable mechanical force is applied. Exemplary separable coupling elements include male and female elements, such as a rod and tube which may be axially separated, a tab and receptacle which may be radially separated, and the like. [0024]
  • In a specific embodiment of the catheter, the catheter body may comprise an expansion element, such as an inflatable balloon, near its distal end. The expansion element will be positionable distal to the retractable sheath so that it can be used to regularly expand one or more of the prostheses. For example, the inflatable balloon may carry multiple prostheses on its outer surface so that sheath retraction can expose one, two, three, or more of the prostheses. The remaining prostheses will continue to be covered by the sheath. When inflating the balloon, however, only that portion of the balloon and those prostheses carried on the exposed portion of the balloon will be inflated. The remaining (proximal) portion of the balloon will continue to be constrained by the sheath so that neither the balloon nor the prostheses covered by the sheath will be expanded. In this way, any preselected number of the individual prostheses may be expanded at one time, while the remaining prostheses are protected and unexpanded, remaining available for subsequent expansion using the balloon. [0025]
  • Alternatively or in addition to the balloon, the catheter body may comprise a heater for selectively heating prostheses which have been advanced distally beyond the sheath. For example, the catheter body may have a lumen for delivering a heated medium, such as heated saline, intravascularly to heat and expand stents or other prostheses formed from suitable heat memory alloys (as described in more detail below). Alternatively, a separate exterior guide catheter or other tube may be used for delivering such a heated medium to effect expansion of the prostheses. As a third alternative, a powered heating element, such as a radio frequency heater, electrical resistance heater, or laser-heated element, may be provided on the catheter body for directly heating the exposed prostheses. [0026]
  • For the delivery of individual prostheses or stents which are joined by frangible or breakable links, as discussed above, it will often be desirable to provide a shearing mechanism on the catheter. The shearing mechanism will usually be mechanical, but could also be electrolytic, ultrasonic, or chemical. In the exemplary embodiments, the shearing mechanism comprises a first shearing element on a distal region of the catheter body and a second or mating shearing element on a distal region of the sheath. The prostheses may be advanced from the sheath while the shearing mechanism on the catheter body is distally advanced (leaving a space or opening for prosthesis deployment). After a desired number of prostheses have been deployed, the catheter body may be retracted relative to the sheath in order to close the shearing elements to sever the link(s) between the advanced prostheses and those prostheses which remain within the sheath. In other cases, the shearing mechanism could be an electrode for inducing electrolytic breakage of the link, an ultrasonic transducer for mechanically degrading a susceptible link (i.e. a link having a resonant frequency which corresponds to the ultrasonic transducer), a luminal port for releasing a chemical agent selected to chemically degrade the link, or the like. [0027]
  • In a further alternative embodiment, a catheter constructed in accordance with the principles of the present invention comprises a pusher tube, a plurality of radially expansible prostheses arranged end-to-end and extending distally of the distal end of the pusher tube, and a sheath disposed coaxially over the pusher tube and the prostheses. Optionally, but not necessarily, this embodiment will include a catheter body disposed coaxially within the pusher tube and prostheses. By retracting the sheath proximally relative to the pusher tube, individual ones or groups of the prostheses will be exposed and deployed. The catheter body may be used in any of the ways described previously in order to effect or control deployment of the prostheses. Optionally, the pusher tube, the sheath, or both, may have a greater column strength than the catheter body when the catheter body is employed. [0028]
  • Systems of detachable expansible prostheses according to the present invention include a plurality of ring-like radially expansible prostheses arranged end-to-end along an elongate axis. At least one pair of coupling elements join each pair of adjacent prostheses, where the coupling elements physically separate without fracture in response to axial tension or differential radial expansion. The coupling elements, however, remain coupled when subjected to axial compression such as may occur as the prostheses are axially advanced within a body lumen or elsewhere. The prostheses may be composed of a malleable material so that they will be expansible in response to an internally applied radially expansive force, such as a balloon expansion force applied by a balloon carried by the catheter body in any of the prior embodiments of the present invention. Alternatively, the prostheses may be composed of a resilient material, such as spring stainless steel, nickel-titanium alloy; or the like, so that they may be “self-expanding,” i.e. expand when released from radial constraint. As a third alternative, the prostheses may be composed of a heat memory alloy, such as a nickel titanium alloy, so that they may be induced to expand upon exposure to a temperature above body temperature. Materials suitable for forming each of these three types of prostheses are well described in the patent and medical literature. [0029]
  • In specific examples of the systems, the coupling elements may be male and female so that they decouple upon the application of an axial force. For example, the coupling elements may be a rod and a tube having a central passageway for receiving the rod. Alternatively, the coupling elements may be configured to decouple upon differential radial expansion. For example, a first coupling element may extend from the end of a first prostheses and have an enlarged portion or end. By providing a cut-out in the adjacent prostheses having a periphery which matches the periphery of the extension on the first prostheses, coupling elements can be mated and locked together. The locking will resist axial separation, but permit radial separation when one of the prostheses is radially expanded. [0030]
  • The systems of prostheses just described maybe preferably employed with any of the catheter delivery systems described previously. [0031]
  • The present invention further provides methods for stenting extended lengths of the body lumen, where the methods comprise introducing a catheter carrying a plurality of radially expansible prostheses to a target site within the body lumen. The prostheses are arranged end-to-end and are covered by a sheath. The prostheses are then deployed by retracting the sheath relative to the prostheses by a first preselected distance to uncover a first predetermined number of the prostheses. After retraction of the sheath, a first predetermined number of prostheses, which may be anywhere from one up to the entire number of prostheses being carried, are radially expanded at the target site within the target site of the body lumen. [0032]
  • Prosthesis expansion may be achieved in a variety of ways. In a first instance, the prostheses are expanded by inflating a balloon within the particular prosthesis to be expanded. For example, a single balloon may be disposed under all the prostheses, with the sheath retracted to expose only those prostheses to be deployed. When the balloon is expanded, the balloon will expand the exposed prostheses, with expansion of the prostheses which remain covered being restrained by the sheath. By further retracting the sheath, the previously undeployed prostheses may then be deployed. Optionally, the prostheses are advanced (or at least axially restrained relative to the sheath) by a pusher tube which engages a proximal end of the proximal-most prosthesis. [0033]
  • As an alternative to balloon expansion, the uncovered prostheses may be expanded by exposure to heat. The heat may be applied by directing a heated medium to the prostheses, directing electrical energy through the prostheses, and/or energizing a heating element positioned adjacent to the uncovered prostheses. [0034]
  • In preferred aspects of the methods of the present invention, the body lumen will be a blood vessel, preferably a coronary artery, a cerebral artery, or other small artery. The prostheses will preferably be coated with biologically active or inert agent, such as an agent selected to inhibit hyperplasia, more specifically being any of the particular agents set forth hereinabove. [0035]
  • The catheters of the present invention will comprise a number of coaxial components, such as sheaths, pusher tubes, catheter bodies, and the like. While it will often be described that stents or other prostheses are advanced distally from the sheath, such description will apply to sheaths which are retracted proximally relative to the prostheses to effect the release. Thus, all descriptions of direction are meant to be relative.[0036]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view illustrating a stent delivery catheter constructed in accordance with the principles of the present invention. [0037]
  • FIG. 2 is a detailed view of the distal end of the catheter of FIG. 1 with portions broken away. [0038]
  • FIGS. [0039] 3A-3F illustrate use of the catheter of FIG. 1 for deploying a plurality of stents using balloon expansion.
  • FIG. 4 illustrates an exemplary prosthesis constructed in accordance with the principles of the present invention. [0040]
  • FIGS. 5A and 5B illustrate a prosthesis similar to that shown in FIG. 4, but further including coupling elements for permitting detachable coupling of adjacent prostheses. [0041]
  • FIG. 5C illustrates a pair of prostheses, as shown in FIG. 5A and FIG. 5B, joined together by the coupling elements. [0042]
  • FIG. 5D illustrates a pair of adjacent prostheses coupled by a modified coupling element. [0043]
  • FIGS. 5E and 5F illustrate radial separation of the adjacent prostheses of FIG. 5C. [0044]
  • FIGS. 6A and 6B illustrate a second coupling mechanism constructed in accordance with the principles of the present invention. [0045]
  • FIG. 7 illustrates a frangible linkage for joining a pair of adjacent prostheses. [0046]
  • FIGS. [0047] 8A-8C illustrate a catheter and its use for delivering self-expanding prostheses according to the methods of the present invention.
  • FIGS. 9A and 9C illustrate an alternative catheter construction intended for delivering self-expanding prostheses according to the methods of the present invention. [0048]
  • FIGS. [0049] 10A-10C illustrates use of the catheter for delivering prostheses by a heat-induction method in accordance with the principles of the present invention.
  • FIG. 11 illustrates an alternative catheter construction for delivering multiple prostheses via a heat-induction protocol in accordance with the principles of the present invention. [0050]
  • FIGS. [0051] 12A-12D illustrate a catheter for delivering multiple prostheses using balloon expansion in accordance with the methods of the present invention.
  • FIGS. [0052] 13A-13D illustrate a catheter including a stent valve for delivering multiple prostheses using balloon expansion in accordance with the methods of the present invention.
  • FIG. 14 illustrates an exemplary kit constructed in accordance with the principles of the present invention.[0053]
  • DETAILED DESCRIPTION OF THE SPECIFIC EMBODIMENTS
  • Referring now to FIG. 1, the stent delivery catheter [0054] 10 comprises a catheter body 12 having a proximal end 14 and a distal end 16. The catheter body is formed from a conventional catheter material, such as braided or coiled stainless steel, a natural or synthetic polymer, including silicone rubber, polyethylene, polyvinylchloride, polyurethane, polyester, polytetrafluoroethylene, nylon, and the like. The body may be formed as a composite having one or more reinforcement layers incorporated within a polymeric shell in order to enhance strength, flexibility, and toughness. For intravascular use, the catheter body will typically have a length in the range from 40 cm to 150 cm, usually being between 40 cm and 120 cm for peripheral blood vessels and between 110 cm and 150 cm for coronary arteries. The outer diameter of the catheter body may vary depending on the intended use, typically being between 3 French and 15 French, usually from 5 French to 9 French.
  • Catheter [0055] 10 will include a handle 18 at its proximal end 14. The handle may include a guidewire port 20 and a balloon inflation port 22, as well as a handle grip 24 which advances a pusher shaft whose distal end 26 is shown in FIG. 2. Additionally, the handle permits reciprocation of a catheter delivery balloon 28, also shown in FIG. 2.
  • A plurality of stents [0056] 30 are carried in a lumen of the catheter body 12, as shown in FIG. 2. While three stents 30 are shown, it will be appreciated that additional stents may be carried generally within the ranges disclosed above. The illustrated stents comprise a plurality of serpentine ring structures joined by offset struts. It will be appreciated, however, that a wide variety of stent structures could be carried by the catheter 10, generally as described above.
  • Referring now to FIGS. [0057] 3A-3F, the distal end 16 of the catheter 10 is advanced to target location 40 within a diseased blood vessel (BV) over a guidewire 42, as illustrated in FIG. 3B. Balloon 28 carries a first of the three stents 30, and is advanced distally from the catheter to deploy the stent within the treatment region 40, as illustrated in FIG. 3B (optionally by retracting the catheter body 12 proximally relative to balloon 28). Once the stent 30 is properly located, the balloon 28 is inflated to deploy the stent (and optionally dilate the treatment region), as illustrated in FIG. 3C.
  • The balloon is then deflated, and retracted back into the distal end of the catheter [0058] 16, as illustrated in FIG. 3D. The expanded stent is left in place. The balloon 28 is retracted back to within the second stent 30, as illustrated in FIG. 3E. The second stent has been advanced using the pusher 26 so that it is properly located over the balloon 28, and the distal end of the catheter 16 may then be advanced so that the second stent 30 is located within a second treatment region spaced apart from the first treatment region. As illustrated in FIG. 3F, the treatment regions are adjacent to each other. It will be appreciated, however, that the second treatment region could be spaced a substantial distance from the first treatment region. Deployment of the second stent 30 is then completed in the same manner as described above for the first stent. Similarly, deployment of third, fourth, fifth, and additional stents 30 may be effected in the same manner. In this way, it will be appreciated that relatively lengthy and/or disseminated regions within a blood vessel may be treated.
  • Referring now to FIG. 4, an exemplary prosthesis [0059] 50 constructed in accordance with the principles of the present invention is illustrated. The prosthesis has a tubular body 52 having a plurality of axial slots 54, typically formed by laser cutting or chemical etching a tubular stock, such as stainless steel or nickel-titanium hypotube. Prosthesis 50, which may be delivered in groups of two, three, four, or more in accordance with the principles of the present invention, will have a length within the ranges set forth above. The diameter, prior to expansion, will typically be below 2 mm, preferably being below 1 mm, although in some instances much larger diameters can be used. The diameter of the prosthesis 50 upon expansion, of course, will be much greater, typically being at least twice as large, sometimes being at least three times as large, or even larger.
  • Referring now to FIGS. 5A and 5B, a prosthesis [0060] 60, similar to prosthesis 50, includes a pair of coupling elements 62 which are received in mating slots 64. FIG. 5B is a “rolled-out” view of the “rolled-out” view of the prosthesis 60 for better illustrating the coupling element 62 and slots 64 of the prosthesis 60.
  • As shown in FIG. 5C, pairs of prosthesis [0061] 60 may be joined or coupled by circumferentially aligning the coupling element 62 with the slot 64. Although only a single coupling element 62 and slot 64 is visible in FIG. 5C, it will be appreciated that the second coupling element and slot will be located on the opposite side of the illustrated pair of prostheses.
  • In FIG. 5C, the two prosthesis [0062] 60 are abutted directly against each other. Such a configuration is advantageous in that it provides for a substantially continuous stent or graft structure when the pair is expanded together in a body lumen. The structure, however, is disadvantageous in that it does not provide for flexibility at the point where the two prostheses meet. In order to provide for greater flexibility, as shown in FIG. 5D, a coupling element 62′ can have an elongated shank to provide for a desired offset, typically in the range from 0.05 mm to 1 mm, preferably from 0.1 mm to 0.5 mm.
  • Referring now to FIGS. 5E and 5F, axial separation of the prostheses [0063] 60 is achieved by differential radial expansion of at least one of the prostheses. For example, when both prostheses 60 are in their unexpanded configurations, as shown in FIG. 5E, the coupling elements 62 are constrained by the slots 64, as previously described. By radially expanding the left-hand prostheses 60, as shown in FIG. 5F, the coupling elements 62 will be moved radially outwardly from the slots so that the two prostheses are no longer axially linked. It will be appreciated, however, that the two prostheses 60 may be radially expanded together (as described in more detail hereinafter) in a manner which preserves the link created by the coupling elements 62 and slots 64 so that combinations of two, three, four, or more prostheses may be delivered simultaneously and, in effect, provide a continuous prosthesis having a length which is some multiple of the length of each individual prostheses 60. The combined prostheses may then be separated from any additional prostheses (which remain in a delivery catheter as described below) by the radial expansion of those prostheses which are to be deployed. In this way, stents, grafts, or other prostheses may be delivered to the body lumen in both different lengths (by properly selecting the number of individual prostheses 60) and at different locations (by releasing individual or multiple prostheses 60 at different portions of the body lumen).
  • Axially separable coupling elements may also be provided, as illustrated in FIGS. 6A and 6B. Each prosthesis [0064] 70 includes a pair of male coupling elements 72 at one end and a pair of female coupling elements 74 at the other end. The male coupling elements 72 are typically short rods which extend axially from the periphery of the prosthesis end and the female coupling elements are typically short tubes having hollow interiors which detachably receive the male coupling elements. Thus, the prostheses 70 may be joined in an end-to-end manner, as shown in FIG. 6B. The prostheses are separated by pulling them in an axial direction, as shown by arrow 76, but will remain linked under axial compression as well as when exposed to a substantial bending moment. Thus, the axially separable coupling structures of FIGS. 6A and 6B are advantageous in that they remain linked during deployment of the prostheses 70, even when deployment involves significant bending and radial stress. Separation may be effected by pullback on the delivery catheter in order to disengage the coupling elements 72 and 74.
  • A third approach for detachably coupling adjacent prostheses [0065] 80 is illustrated in FIG. 7. Each prosthesis 80 comprises an expansible ring of diamond-shaped members. Other conventional stent or prostheses structures, however, could also be used. The adjacent prostheses 80 are joined by an axial beam 82 which preferably includes a weakened segment 84 near its midpoint. The use of such a joining structure, which will require physical breakage (as opposed to the simple detachment characteristic of the embodiment of FIGS. 5 and 6) is advantageous in that it provides a very strong linkage which permits both the application of axial compression and axial tension without decoupling. The disadvantage of such a linkage is that it usually requires some mechanism or capability to be incorporated in the delivery catheter to permit selective breakage of the couple.
  • Referring now to FIGS. [0066] 8A-8C, a catheter 100 suitable for delivering a plurality of self-expanding prostheses 102 will be described. Catheter 100 comprises a sheath 104 having an axial lumen which carries the prostheses 102 near its distal end 106. A pusher tube 108 is also positioned in the lumen and is located proximally of the proximal most prosthesis 102. The individual prostheses 102 may be delivered into a body lumen, typically a blood vessel BV, as illustrated in FIG. 8B. The catheter is introduced over a guidewire GW to a desired target site in the blood vessel BV. When at the target site, a first of the prostheses 102 is deployed by axially advancing the pusher tube 104 so that the line of prostheses 102 is axially advanced, with the distal-most prostheses being released from the distal end 106 of the catheter. As it is released, the distal-most prostheses 102 expands since it is being released from the radial constraint provided by the sheath 104.
  • Catheter [0067] 100 of FIGS. 8A-8C is intended for delivering prostheses which abut each other in an end-to-end manner, but which are otherwise unconnected. A catheter 120 intended for releasing self-expanding prostheses 122 which are mechanically linked by frangible coupling elements 124 is illustrated in FIGS. 9A-9C. The prostheses 122 and coupling elements 124 may be similar to the prosthesis structure shown in FIG. 7, or may comprise other linked prosthesis or stent structures, for example as shown in U.S. Pat. No. 6,258,117, the disclosure of which is incorporated herein by reference.
  • Catheter [0068] 120 comprises a sheath 126, a pusher tube 128, and a catheter body 130 having a shearing element 132 at its distal end. Conveniently, the pusher tube 128 is coaxially received over a shaft 134 of the catheter body 130. In this way, the pusher tube may be used to axially advance each prosthesis 122 by pushing on the proximal end of the proximal-most prosthesis, as shown in FIG. 9B.
  • The catheter [0069] 120 is advanced over a guidewire GW to a desired target site in a blood vessel BV. After reaching the target site, at least a first prosthesis 122 is advanced from the distal end of the sheath so that it radially expands to engage an inner wall of the blood vessel. After the at least one prosthesis 122 is advanced sufficiently far, the frangible coupling elements 124 will reach a shearing element 136, typically a metal ring, disposed at the distal end of the sheath 126. By then axially retracting the catheter body 130, a chamfered surface 138 of the shearing element 132 is engaged against the shearing element 136 in order to shear the links 122, releasing the prosthesis 122, as illustrated in FIG. 9C. After deployment and release of the first prosthesis 122, additional prosthesis 122 may be released adjacent to the first prosthesis or at different, axially spaced-apart locations within the blood vessel.
  • Referring now to FIGS. [0070] 10A-10C, a catheter 140 for delivering a plurality of heat expansible prostheses 142 is illustrated. The prostheses 142 are composed of a heat memory alloy, such as a nickel titanium alloy, which has been programmed to remain in an unexpanded configuration when maintained at body temperature or below, and to assume an expanded configuration when exposed to temperatures above body temperature, typically temperatures above 43° C., often above 45° C. The prostheses will have coupling members which anchor successive prostheses 142 together, typically the radially separating anchors illustrated in FIGS. 5A-5F.
  • The catheter [0071] 140 includes a sheath 144 and a pusher tube 146. The catheter 140 is advanced to a desired target site within the blood vessel BV over a guidewire GW in a conventional manner. After the distal-most prostheses 142 has been fully advanced from the sheath 144 (usually by retracting the sheath 144 while the prostheses are held stationary relative to the blood vessel BV using the pusher tube 146), as shown in FIG. 10B, it will remain both unexpanded and attached to the next proximal prosthesis 142 which remains within the sheath. It is important that the advanced prosthesis 142 be anchored or tethered to the remaining prostheses since it has not yet been expanded and it would otherwise be lost into the lumen of the blood vessel.
  • After the uncovered prostheses is properly positioned, a heated medium may be introduced through a lumen of the catheter body [0072] 148 so that it flows outwardly through the interior of the distal-most prosthesis 142. By properly selecting the temperature of the heated medium, the prosthesis to be deployed can be heated sufficiently to induce radial expansion, as illustrated in FIG. 10C. By positioning the catheter body 148 so that its distal tip is coterminous with the distal tip of the sheath 144, inadvertent heating of the prostheses 142 which remain within the sheath can be avoided. After the prosthesis 142 has radially expanded, it will separate from the coupling elements 148 located on the next prosthesis which remains within the sheath 144. Additional ones or groups of prostheses 142 may then be deployed, either at the same target site or at a different target site axially spaced-apart within the lumen of the blood vessel BV.
  • As illustrated in FIG. 11, instead of using an internal catheter body [0073] 148, as illustrated in FIGS. 10A-10C, an external sheath 150 may be used to deliver the heated medium around one or more deployed prostheses 142. Other aspects of the construction of catheter 140 may remain the same. Optionally, if prosthesis is martensitic at body temperature, further radial expansion can be achieved by internal balloon expansion.
  • Referring now to FIGS. [0074] 12A-12D, catheter 160 intended for delivery of multiple prostheses 162 by balloon deployment is illustrated. Catheter 160 comprises a sheath 164, pusher tube 166, and a catheter body 168. The catheter body 168 includes an expansible balloon 170 over its distal portion. Individual prostheses 162 are deployed, as illustrated in FIGS. 12B and 12C, by crossing the target area with catheter 160 and then retracting sheath 164. A distal portion of the balloon 170 lies within the distal-most deployed prosthesis 162, as shown in FIG. 12B. The remaining proximal portion of the balloon 170 will, of course, remain within the other prostheses 162 which themselves remain within the sheath 164. The balloon 170 is then inflated, but only the distal portion of the balloon beyond the sheath inflates within the distal prosthesis 162, as illustrated in FIG. 12C. Expansion of the remaining proximal portion of the balloon is prevented by the sheath 164. Similarly, the remaining prostheses 162 remain unexpanded since they remain within the sheath 164. After deployment of prostheses 162, balloon 170 may be deflated and retracted into sheath 164 and remaining prostheses 162.
  • Referring now to FIG. 12D, additional prostheses [0075] 162 may be deployed, either at the same target location within the blood vessel or at a different, spaced-apart locations within the blood vessel. Deployment of two prostheses 162 is illustrated. The two prostheses 162 are axially exposed as the sheath is retracted over the stents which are positioned over the uninflated balloon 170. The balloon 170 is then inflated, as illustrated in FIG. 12D, thus expanding the prostheses 162 within the blood vessel BV. It will be appreciated that the catheter 160 could carry many more than the four illustrated prostheses 162, and three, four, five, ten, and even 20 or more individual prostheses could be deployed at one time, with additional single prostheses or groups of prostheses being deployed at different times and/or at different locations within the blood vessel.
  • Referring now to FIGS. [0076] 13A-13D, another embodiment of a catheter 180 intended for delivery of multiple prostheses 182 by balloon deployment is illustrated. In this embodiment, catheter 180 comprises a sheath 184 having a valve member 185 at its distal end, a pusher tube 186, and a catheter body 188. The catheter body 188 includes an expansible balloon 190 over its distal portion. To deploy prostheses 182, as illustrated in FIG. 13B, a predetermined number of prostheses 182 is first exposed by retracting sheath 184 proximally (arrows) while holding pusher tube 186 in place. As shown in FIGS. 13B and 13C, valve member 185 maybe used to engage a distal end of one of the prostheses 182 and the sheath 184 and the pusher tube may be retracted proximally together (arrows in FIG. 13C) to separate a proximal number of prostheses 182 from a distal number of prostheses 182. The distal portion of the balloon 190 lies within the distal, deployed prostheses 182. The remaining proximal portion of the balloon 190 will remain within the other prostheses 182 which themselves remain within the sheath 184. The balloon 190 is then inflated, as shown in FIG. 13D, but only the distal portion of the balloon inflates within the distal prostheses 182, as illustrated in FIG. 12C. Expansion of the remaining proximal portion of the balloon is prevented by the sheath 184. Similarly, the remaining prostheses 182 remain unexpanded since they remain within the sheath 184.
  • Referring now to FIG. 13D, single or multiple prostheses [0077] 182 may be deployed at the same target location within the blood vessel. Additional prostheses 182 may also be deployed at different, spaced-apart locations within the blood vessel. Deployment of two prostheses 182 is illustrated at one location in FIG. 13D. It will be appreciated that the catheter 180 could carry many more than the four illustrated prostheses 182, and three, four, five, ten, and even 20 or more individual prostheses could be deployed at one time, with additional single prostheses or groups of prostheses being deployed at different times and/or at different locations within the blood vessel.
  • Referring now to FIG. 14, kits [0078] 200 according to the present invention comprise a catheter 160 (or any other of the illustrated catheters of the present invention) in combination with instructions for use IFU. The instructions for use set forth any of the methods of the present invention, and in particular set forth how the catheter 180 may be used to implant single or multiple prostheses within a blood vessel or other body lumen. The catheter 180 and instructions for use will typically be packaged together, for example within a conventional package 202, such as a box, tube, pouch, tray, or the like. Catheter 160 will typically be maintained in a sterile condition within the package 202. The instructions for use may be provided on a package insert, may be printed in whole or in part on the packaging, or may be provided in other ways, such as electronically over the internet, on an electronic medium, such as a CD, DVD, or the like.
  • The preferred embodiments of the invention are described above in detail for the purpose of setting forth a complete disclosure and for the sake of explanation and clarity. Those skilled in the art will envision other modifications within the scope and sprit of the present disclosure. [0079]

Claims (116)

    What is claimed is:
  1. 1. A method for stenting extended lengths of a body lumen, said method comprising:
    introducing a catheter carrying a plurality of radially expansible prostheses to a target site within said body lumen, wherein said prostheses are arranged end-to-end and covered by a sheath;
    retracting the sheath by a first preselected distance to uncover a first predetermined number of the prostheses; and
    said first predetermined number of uncovered prostheses radially expanding at a first location within said target site.
  2. 2. A method as in claim 1, further comprising inflating a balloon within said prostheses to effect expansion.
  3. 3. A method as in claim 2, wherein inflating comprises inflating a balloon disposed both under said prostheses to be expanded and under at least some prostheses which remain under the sheath, wherein inflation of the balloon under the sheath is constrained by the sheath to prevent expansion of the at least some prostheses.
  4. 4. A method as in claim 2, further comprising engaging a proximal end of the plurality of prostheses with a pusher tube to axially restrain the prostheses as the sheath is retracted.
  5. 5. A method as in claim 4, further comprising engaging a distal end of one of the prostheses with a valve member coupled with the distal end of the sheath.
  6. 6. A method as in claim 5, further including retracting the sheath and the pusher tube to separate prostheses proximal to valve from the first predetermined number of prostheses.
  7. 7. A method as in claim 6, wherein inflating comprises inflating a balloon disposed under said first predetermined number of prostheses.
  8. 8. A method as in claim 1, further comprising heating the uncovered prostheses to effect expansion.
  9. 9. A method as in claim 8, wherein heating comprises directing a heated medium through the catheter to the uncovered prostheses.
  10. 10. A method as in claim 8, wherein heating comprises energizing a heating element positioned adjacent to the uncovered prostheses.
  11. 11. A method as in claim 8, further comprising engaging a proximal end of the plurality of prostheses with a pusher tube to axially restrain the prostheses as the sheath is retracted.
  12. 12. A method as in claim 1, wherein said prostheses are resilient and radially constrained within the sheath, wherein the prostheses radially expand as the sheath is retracted.
  13. 13. A method as in claim 12, further comprising engaging a proximal end of the plurality of prostheses with a pusher tube to axially restrain the prostheses as the sheath is retracted.
  14. 14. A method as in claim 1, further comprising repositioning the catheter and further retracting the sheath by a second preselected distance to uncover a second predetermined number of prostheses, said second predetermined number of uncovered prostheses radially expanding at a second location within said target site.
  15. 15. A method as in claim 1, wherein the body lumen is a blood vessel.
  16. 16. A method as in claim 1, wherein the prostheses are covered with at least one agent.
  17. 17. A method as in claim 16, wherein the agent inhibits hyperplasia.
  18. 18. A method as in claim 17, wherein the agent is biologically active.
  19. 19. A method as in claim 18, wherein the biologically active agent is selected from the group consisting of anti-neoplastic drugs such as paclitaxel, methotrexate, and batimastal; antibiotics such as doxycycline, tetracycline, rapamycin, and actinomycin; immunosuppressants such as dexamethasone and methyl prednisolone; nitric oxide sources such as nitroprussides; estrogen; and estradiols.
  20. 20. A method as in claim 17, wherein the agent is biologically inert.
  21. 21. A method as in claim 20, wherein the biologically inert agent is selected from the group consisting of collagen, polyethylene glycol (PEG), polyglycolic acids (PGA), ceramic material, platinum and gold.
  22. 22. A method for stenting extended lengths of a body lumen, said method comprising:
    introducing a catheter carrying at least three discrete stents;
    releasing at least a first stent from the catheter at a first location in the body lumen;
    repositioning the catheter;
    releasing at least a second stent from the catheter at a second location;
    repositioning the catheter;
    releasing at least a third stent from the catheter at a third location.
  23. 23. A method as in claim 22, wherein the catheter carries at least four discrete stents, further comprising repositioning the catheter and releasing at least a fourth stent at a fourth location.
  24. 24. A method as in claim 23, wherein the catheter carries at least five discrete stents, further comprising repositioning the catheter and releasing at least a fifth stent at a fifth location.
  25. 25. A method as in claim 22, wherein the body lumen comprises a blood vessel.
  26. 26. A method as in claim 25, wherein the stents are released at locations which span a length of at least 3 mm in the blood vessel.
  27. 27. A method as in claim 25, where at least two stents are positioned on opposite sides of an opening in the blood vessel to a side branch.
  28. 28. A method as in claim 22, wherein releasing the stents comprises expanding a balloon within the stents.
  29. 29. A method as in claim 22, wherein releasing the stents comprises releasing the stents from constraint and allowing the stents to self-expand.
  30. 30. A method as in claim 22, wherein the stents are coated with at least one agent.
  31. 31. A method as in claim 30, wherein the agent inhibits hyperplasia.
  32. 32. A method as in claim 30, wherein the agent is biologically active.
  33. 33. A method as in claim 32, wherein the biologically active agent is selected from the group consisting of anti-neoplastic drugs such as paclitaxel, methotrexate, and batimastal; antibiotics such as doxycycline, tetracycline, rapamycin, and actinomycin; immunosuppressants such as dexamethasone and methyl prednisolone; nitric oxide sources such as nitroprussides; estrogen; and estradiols.
  34. 34. A method as in claim 30, wherein the agent is biologically inert.
  35. 35. A method as in claim 34, the biologically inert agent is selected from the group consisting of collagen, PEG, PGA, ceramic material, platinum and gold.
  36. 36. A catheter for stenting extended lengths of a body lumen, said catheter comprising:
    a catheter body having a proximal end and a distal end;
    at least three discrete stents carried near a distal end of the catheter body; and
    means for deploying the stents independently or in groups from the catheter body within the body.
  37. 37. A catheter as in claim 36, comprising at least four discrete stents carried near the distal end of the catheter body.
  38. 38. A catheter as in claim 37, comprising at least five discrete stents carried near the distal end of the catheter body.
  39. 39. A catheter as in claim 36, wherein the deploying means comprises at least three independently inflatable balloons, wherein each balloon carries at least one stent.
  40. 40. A catheter as in claim 36, wherein the deploying means comprises a single balloon reciprocatably mounted within the catheter body and a pusher for successively loading stents over the balloon.
  41. 41. A catheter as in claim 36, wherein the deploying means comprises a radial restraint which holds the stents in a radially collapsed configuration and which can be selectively retracted to release the stents independently or in groups.
  42. 42. A catheter as in claim 36, wherein the deploying means comprises a radial restraint which holds the stents in a radially collapsed configuration and a pusher for holding the stents in place while the radial restraint is retracted to expose the stents from the distal end of the catheter body independently or in groups.
  43. 43. A catheter as in claim 42, wherein the radial restraint comprises a sheath having a valve member at its distal end for engaging a distal end of a proximal stent, to separate the proximal stent from a distal stent.
  44. 44. A catheter as in claim 36, wherein the stents are coated with at least one agent.
  45. 45. A catheter as in claim 44, wherein the agent inhibits hyperplasia.
  46. 46. A catheter as in claim 45, wherein the agent is biologically active.
  47. 47. A catheter as in claim 46, wherein the biologically active agent is selected from the group consisting of anti-neoplastic drugs such as paclitaxel, methotrexate, and batimastal; antibiotics such as doxycycline, tetracycline, rapamycin, and actinomycin; immunosuppressants such as dexamethasone and methyl prednisolone; nitric oxide sources such as nitroprussides; estrogen; and estradiols.
  48. 48. A catheter as in claim 45, wherein the agent is biologically inert.
  49. 49. A catheter as in claim 48, wherein the biologically inert agent is selected from the group consisting of collagen, PEG, PGA, ceramic material, platinum and gold.
  50. 50. A catheter as in claim 36, wherein the stents are composed at least partly of a bioabsorbable material.
  51. 51. A catheter as in claim 50, wherein a bioactive substance is disposed in the bioabsorbable material and is released over time as the material degrades.
  52. 52. A catheter as in claim 50 or 51, wherein the bioabsorbable material is formed on or within a scaffold composed of a non-bioabsorbable material.
  53. 53. A catheter for delivering a plurality of expansible prostheses to a body lumen, said catheter comprising:
    a catheter body having a proximal end and a distal end;
    a sheath coaxially disposed over the catheter-body; and
    a plurality of radially expansible prostheses disposed over a distal portion of the catheter all within the sheath,
    wherein the sheath may be retracted proximally, relative to the catheter body and the prostheses, to expose the prostheses beyond a distal end of the sheath.
  54. 54. A catheter as in claim 53, further comprising a pusher tube disposed coaxially over the catheter body, within the sheath, and proximal to the prostheses, wherein the pusher tube engages a proximal end of a proximal-most prosthesis so that the pusher tube can be held in place to expose individual prostheses or groups of prostheses as the sheath is retracted proximally.
  55. 55. A catheter as in claim 54, wherein at least a distal portion of the sheath has a greater column strength than that of the catheter body.
  56. 56. A catheter as in claim 54, wherein at least a distal portion of the pusher tube has a greater column strength than that of the catheter body.
  57. 57. A catheter as in claim 54, wherein the pusher tube has at least one of a lubricious inner surface and a lubricious outer surface.
  58. 58. A catheter as in claims 53-56, wherein the prostheses are arranged end-to-end to abut without physical linkage.
  59. 59. A catheter as in claims 53-56, wherein the prostheses are arranged end-to-end with a physical linkage between at least some adjacent pairs of prostheses.
  60. 60. A catheter as in claim 59, wherein the physical linkage comprises male and female elements which can be separated without breakage.
  61. 61. A catheter as in claim 59, wherein the physical linkage is separated with breakage.
  62. 62. A catheter as in claims 53-56, wherein the catheter body comprises an expansion element near its distal end, said expansion element being positionable distal to the retractable sheath to radially expand one or more of the prostheses.
  63. 63. A catheter as in claim 62, wherein the expansion element comprises an inflatable balloon which carries the prostheses, wherein the sheath may be retracted relative to the balloon to expose a preselected number of prostheses and balloon length so that the exposed prostheses and balloon length may be selectively expanded.
  64. 64. A catheter as in claim 63, wherein the balloon has a lubricious outer surface.
  65. 65. A catheter as in claim 63, further including a valve member at a distal end of the sheath for engaging a distal end of a prosthesis adjacent to a most-proximal prosthesis of the preselected number of prostheses.
  66. 66. A catheter as in claim 65, wherein the valve member creates a separation between the distal end of the adjacent prosthesis and the most-proximal prosthesis when the sheath and the pusher are retracted.
  67. 67. A catheter as in claims 53-56, wherein the catheter body includes means for selectively heating prostheses which have been advanced distally beyond the sheath, wherein said prostheses radially expand upon such heating.
  68. 68. A catheter as in claim 67, wherein the heating means comprises a lumen within the catheter body for infusing a heated medium to only those prostheses which have been exposed beyond the distal end of the sheath.
  69. 69. A catheter as in claim 67, wherein the heating means comprises a heating element disposed on a distal portion of the catheter body and positionable within the prostheses to be expanded.
  70. 70. A catheter as in claims 53-56, wherein the sheath has an outer diameter of 2 mm or less.
  71. 71. A catheter as in claim 70, wherein the sheath has an outer diameter of 1 mm or less.
  72. 72. A catheter as in claims 53-56, wherein the sheath has a lubricious outer surface.
  73. 73. A catheter as in claim 53-56, wherein the sheath has a lubricious inner surface.
  74. 74. A catheter as in claim 53-56, wherein the catheter body has at least one of a lubricious inner surface and a lubricious outer surface.
  75. 75. A catheter as in claims 53-56, further comprising means for shearing individual prostheses physically linked with breakable linkages from said plurality of prostheses.
  76. 76. A catheter as in claim 75, wherein said severing means comprises a shearing element on a distal region of the catheter body and a mating shearing element on a distal region of the sheath, wherein (1) the catheter body is distally advanced relative to the sheath to permit advancement of one or more prostheses and (2) the catheter body is then proximally retracted relative to the sheath so that the shearing elements shear a breakable linkage.
  77. 77. A catheter for delivering a plurality of expansible prostheses to a body lumen, said catheter comprising:
    a pusher tube having a proximal end and a distal end;
    a plurality of radially expansible prostheses arranged end-to-end and distally of the distal end of the pusher tube;
    a sheath disposed coaxially over the pusher tube and the prostheses so that the sheath can be retracted relative to the pusher tube to selectively deploy selective ones of the prostheses.
  78. 78. A catheter as in claim 77, further comprising a catheter body having a proximal end and a distal end disposed coaxially within the pusher tube and prostheses.
  79. 79. A catheter as in claim 77, wherein at least a distal end of the pusher end of the pusher tube has a greater column strength than the sheath.
  80. 80. A catheter as in claim 77, wherein at least a distal portion of the sheath has a greater column strength than that of the catheter body.
  81. 81. A catheter as in claim 77, wherein at least a distal portion of the pusher tube has a greater column strength than that of the catheter body.
  82. 82. A catheter as in claim 77, wherein the catheter body has at least one of a lubricious outer surface and a lubricious inner surface.
  83. 83. A catheter as in claims 77-81, wherein the sheath has an outer diameter of 2 mm or less.
  84. 84. A catheter as in claim 83, wherein the sheath has an outer diameter of 1 mm or less.
  85. 85. A catheter as in claims 77-81, wherein the sheath has a lubricious outer surface.
  86. 86. A catheter as in claims 77-81, wherein the sheath has a lubricious inner surface.
  87. 87. A catheter as in claims 77-81, wherein the pusher tube has at least one of a lubricious inner surface and a lubricious outer surface.
  88. 88. A catheter as in claims 77-81, wherein the prostheses abut each other without physical linkage.
  89. 89. A catheter as in claims 77-81, wherein the prostheses are connected with a physical linkage between at least some adjacent pairs of prostheses.
  90. 90. A catheter as in claim 89, wherein the physical linkage comprises male and female elements which can be separated without breakage.
  91. 91. A catheter as in claim 89, wherein the physical linkage is separated with breakage.
  92. 92. A catheter as in claims 77-81, wherein the catheter body comprises an expansion element near its distal end, said expansion element being positionable distal to the retractable sheath to radially expand one or more of the prostheses.
  93. 93. A catheter as in claim 92, wherein the expansion element comprises an inflatable balloon which carries the prostheses, wherein the sheath may be retracted to expose a preselected number of prostheses and balloon length so that the exposed prostheses and balloon length may be selectively expanded.
  94. 94. A catheter as in claims 77-81, further comprising means for selectively heating prostheses which have been advanced distally beyond the sheath, wherein said prostheses radially expand upon such heating.
  95. 95. A catheter as in claim 94, wherein the heating means comprises a lumen within the catheter for infusing a heated medium to only those prostheses which have been distally advanced.
  96. 96. A catheter as in claim 94, wherein the heating means comprises a heating element disposed on a distal portion of the catheter and positionable within.
  97. 97. A catheter as in claims 77-81, further comprising means for shearing individual prostheses physically linked with breakable linkages from said plurality of prostheses.
  98. 98. A catheter as in claim 97, wherein said severing means comprises a shearing element on a distal region of the catheter and a mating shearing element on a distal region of the sheath, wherein (1) the catheter body is distally advanced relative to the sheath to permit advancement of one or more prostheses and (2) the catheter is then proximally retracted relative to the sheath so that the shearing elements shear a breakable linkage.
  99. 99. A system of detachable expansible prostheses, said system comprising:
    a plurality of ring-like radially expansible prostheses arranged end-to-end along an elongate axis; and
    at least one pair of coupling elements joining each two adjacent prostheses, wherein the coupling elements physically separate without fracture in response to axial tension or differential radial expansion but remain coupled in response to axial compression.
  100. 100. A system as in claim 99, wherein the prostheses are composed of a malleable material so that they are expansible in response to an internally applied radially expansive force.
  101. 101. A system as in claim 99, wherein the prostheses are composed of a resilient material so that they may be released from radial constraint to self-expand.
  102. 102. A system as in claim 99, wherein the prostheses are composed of a material which expands in response to a change in temperature.
  103. 103. A system as in claims 99-102, wherein the coupling elements are male and female so that they decouple by axial withdrawal.
  104. 104. A system as in claims 99-102, wherein the coupling elements are peripherally match patterns which decouple when one of the adjacent prostheses is radially expanded.
  105. 105. A system as in claims 99-102, wherein the prostheses are coated with am agent.
  106. 106. A system as in claim 105, wherein the agent inhibits hyperplasia.
  107. 107. A system as in claim 106, wherein the agent is biologically active.
  108. 108. A system as in claim 107, wherein the biologically active agent is selected from anti-neoplastic drugs such as paclitaxel, methotrexate, and batimastal; antibiotics such as doxycycline, tetracycline, rapamycin, and actinomycin; immunosuppressants such as dexamethasone and methyl prednisolone; nitric oxide sources such as nitroprussides; estrogen; and estradiols.
  109. 109. A system as in claim 106, wherein the agent is biologically inert.
  110. 110. A system as in claim 109, collagen, PEG, PGA, ceramic material, platinum and gold.
  111. 111. A system as in claims 99-102, in combination with a delivery catheter.
  112. 112. A system as in claim 111, wherein the delivery catheter comprises a sheath which is coaxially positioned over the plurality of ring-like prostheses.
  113. 113. A system as in claim 112, wherein the delivery catheter further comprises a pusher tube for selectively advancing one or more prostheses from the sheath.
  114. 114. A system as in claim 113, wherein the delivery catheter further comprises means for radially expanding the prosthesis after said prosthesis has been advanced from the sheath.
  115. 115. A system as in claim 114, wherein the means for expanding comprises an inflatable balloon.
  116. 116. A system as in claim 114, wherein the means for expanding comprises a heater for heating a temperature-response prostheses.
US10306813 2001-12-03 2002-11-27 Apparatus and methods for delivery of multiple distributed stents Abandoned US20030135266A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US33696701 true 2001-12-03 2001-12-03
US36438902 true 2002-03-13 2002-03-13
US10306813 US20030135266A1 (en) 2001-12-03 2002-11-27 Apparatus and methods for delivery of multiple distributed stents

Applications Claiming Priority (29)

Application Number Priority Date Filing Date Title
US10306813 US20030135266A1 (en) 2001-12-03 2002-11-27 Apparatus and methods for delivery of multiple distributed stents
JP2003548904A JP4680503B2 (en) 2001-12-03 2002-12-03 Catheter for feeding a plurality of distributed stent
EP20020804509 EP1460975A4 (en) 2001-12-03 2002-12-03 Apparatus and methods for delivery of multiple distributed stents
CA 2469127 CA2469127A1 (en) 2001-12-03 2002-12-03 Apparatus and methods for delivery of multiple distributed stents
AU2002357073A AU2002357073C1 (en) 2001-12-03 2002-12-03 Apparatus and methods for delivery of multiple distributed stents
PCT/US2002/038845 WO2003047651A3 (en) 2001-12-03 2002-12-03 Apparatus and methods for delivery of multiple distributed stents
US10412714 US7137993B2 (en) 2001-12-03 2003-04-10 Apparatus and methods for delivery of multiple distributed stents
US10624451 US7294146B2 (en) 2001-12-03 2003-07-21 Apparatus and methods for delivery of variable length stents
US10637713 US7309350B2 (en) 2001-12-03 2003-08-08 Apparatus and methods for deployment of vascular prostheses
US10794405 US7351255B2 (en) 2001-12-03 2004-03-03 Stent delivery apparatus and method
US10814593 US8080048B2 (en) 2001-12-03 2004-03-30 Stent delivery for bifurcated vessels
US10884616 US7182779B2 (en) 2001-12-03 2004-07-02 Apparatus and methods for positioning prostheses for deployment from a catheter
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US11538904 US7922755B2 (en) 2001-12-03 2006-10-05 Apparatus and methods for delivery of multiple distributed stents
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US10306620 Continuation-In-Part US7147656B2 (en) 2001-12-03 2002-11-27 Apparatus and methods for delivery of braided prostheses
US10412714 Continuation-In-Part US7137993B2 (en) 2001-12-03 2003-04-10 Apparatus and methods for delivery of multiple distributed stents
US10624451 Continuation-In-Part US7294146B2 (en) 2001-12-03 2003-07-21 Apparatus and methods for delivery of variable length stents
US10637713 Continuation-In-Part US7309350B2 (en) 2001-12-03 2003-08-08 Apparatus and methods for deployment of vascular prostheses
US11563847 Continuation US7905913B2 (en) 2001-12-03 2006-11-28 Apparatus and methods for delivery of multiple distributed stents
US11563836 Continuation US20070088422A1 (en) 2001-12-03 2006-11-28 Apparatus and methods for delivery of multiple distributed stents
US11685339 Division US20070156226A1 (en) 2001-12-03 2007-03-13 Apparatus and methods for delivery of multiple distributed stents

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US11563836 Abandoned US20070088422A1 (en) 2001-12-03 2006-11-28 Apparatus and methods for delivery of multiple distributed stents
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US12127147 Abandoned US20080234798A1 (en) 2001-12-03 2008-05-27 Apparatus and methods for delivery of multiple distributed stents
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US7905913B2 (en) 2011-03-15 grant
JP4680503B2 (en) 2011-05-11 grant
US20100004729A1 (en) 2010-01-07 application
EP1460975A2 (en) 2004-09-29 application
US20070088422A1 (en) 2007-04-19 application
US20070100424A1 (en) 2007-05-03 application
CA2469127A1 (en) 2003-06-12 application
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US20080234798A1 (en) 2008-09-25 application
JP2005511149A (en) 2005-04-28 application

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