US20050033400A1 - Device and method for staged implantation of a graft for vascular repair - Google Patents
Device and method for staged implantation of a graft for vascular repair Download PDFInfo
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- US20050033400A1 US20050033400A1 US10/866,617 US86661704A US2005033400A1 US 20050033400 A1 US20050033400 A1 US 20050033400A1 US 86661704 A US86661704 A US 86661704A US 2005033400 A1 US2005033400 A1 US 2005033400A1
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- 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
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2/07—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
- A61F2/848—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents having means for fixation to the vessel wall, e.g. barbs
-
- 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
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/89—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
-
- 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
-
- 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
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2002/065—Y-shaped blood vessels
-
- 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
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2/07—Stent-grafts
- A61F2002/075—Stent-grafts the stent being loosely attached to the graft material, e.g. by stitching
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0008—Fixation appliances for connecting prostheses to the body
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0008—Fixation appliances for connecting prostheses to the body
- A61F2220/0016—Fixation appliances for connecting prostheses to the body with sharp anchoring protrusions, e.g. barbs, pins, spikes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
- Y10S623/902—Method of implanting
- Y10S623/903—Blood vessel
Abstract
A graft for repairing defects in arteries is formed from a flexible graft and at least one attachment system. A device and method is disclosed for implanting a graft within the vasculature of a patient, in which the graft is inserted into the patient at a different stage than the attachment systems, and which allows for direct percutaneous insertion of the graft and attachment systems. The method permits control over the position of the graft in the vasculature during the course of deployment of the graft and attachment systems by providing for traction forces to be applied to opposing ends of the graft.
Description
- This application is a continuation-in-part of U.S. Provisional Application No. 60/157,985 filed Oct. 6, 1999.
- The present invention relates to intraluminal grafts and their attachment systems which are used for repairing defects in vessels and other lumens within the body. More particularly, the present invention relates to systems for forming linear and bifurcated grafts and to methods for delivering such grafts and their attachment systems to the correct position within the defective body lumen by staged implantation.
- Aneurysms are discrete dilations of the arterial wall. One of the most common, and among the most life threatening, is an aneurysm of the abdominal aorta between the renal and iliac arteries. If untreated, the aneurysm dilates progressively with an ever increasing risk of rupture and hemorrhagic death.
- One method of treatment is provided by direct surgical intervention, in which the defective vessel may be bypassed or replaced using a prosthetic device such as a synthetic graft. The risks involved in direct surgical intervention of this magnitude are great, and include an extensive recovery period.
- In recent years a less invasive method of treatment has evolved through a series of inventions. The details vary, but, conventionally, a resilient tubular conduit (herein referred to as a “graft”) is introduced into the defective vessel by means of catheters introduced into the femoral artery, and is attached to the non-dilated arteries above and below the aneurysm using expandable metallic or plastic cylinders (herein referred to as “attachment systems”).
- However, the use of generally cylindrical grafts to reinforce vascular walls in a patient is not without problems. The known methods for delivering grafts to the required location within a patient's vascular system conventionally require that an attachment system be delivered simultaneously with the graft, axially overlapping the graft and located either on the interior or the exterior of the graft's lumen, so that upon deployment of the graft the attachment system is expanded to attach the graft to the vascular wall. In the prior art, the attachment system is typically connected to the graft before implantation in the patient by means such as stitching. Because grafts are conventionally required to be compressed into a capsule or sheath before being implanted in final position within the patient's vascular system, delivery capsules or sheaths must be sufficiently small to enable insertion into the patient's vessel, and, once inserted, must be sufficiently flexible to allow bending around corners and branches of the patient's vascular tree. Yet, as a consequence of the practice of delivering the attachment system simultaneously with and axially overlapping the graft, the outer diameter of the delivery capsule or sheath containing the compressed graft in such cases is increased by the presence of the compressed attachment system.
- One of the problems encountered in the art of delivering grafts to the vascular system of a patient is that complications may be encountered in maneuvering the compressed graft and its delivery system around the bends and branches of the patient's vascular system. It will be appreciated that the greater the outer dimension of the capsule containing the compressed graft to be delivered, the more inflexible it will be, making delivery to the final destination more difficult and perhaps even impossible in some patients.
- Another problem encountered in the art of graft delivery is that, in the majority of cases, the patient must be subject to surgery in which the appropriate vessel is surgically exposed and opened by incision to allow entry of the graft. Significantly, it is this surgical procedure on the vessel which gives rise to the most serious complications known in the art of minimally invasive graft delivery, with complications taking the form of infection, patient discomfort, and necrosis of the vessel itself. However, if the outside dimension of the delivery capsule were sufficiently small, it might be possible, depending on the size and condition of the patient, to insert the capsule into the patient's vessel by applying sufficient force to the skin and artery of the patient with a sharpened end of the graft's delivery capsule, similar to the commonly known method of inserting a needle directly into the vein or artery of a patient.
- There therefore exists a need to reduce the outside dimension of the capsule or sheath containing a compressed graft to be delivered to the patient's vascular system. This invention addresses these needs.
- The present invention provides a device and a method for delivering a graft to a desired location within a patient's vascular system, and then, while maintaining the graft's position by applying traction forces to the ends of the graft, to deliver at least one attachment system for attaching the graft to the vascular wall. By delivering the graft and the attachment system in separate stages, the outside dimensions of the delivery capsules or sheaths containing the graft and the attachment system separately may be substantially less than that of a capsule or sheath containing the graft and the attachment system together. This reduction in outside dimension of the delivery capsule or sheath facilitates delivery of the graft and may allow for the direct percutaneous insertion of the graft and its attachment system, depending on the condition of the patient.
- One aspect of the present invention provides a device and a method for repairing a linear vascular structure. A method in accordance with this aspect of the present invention includes the use of a linear graft compressible between an uncompressed condition and a compressed condition, a guide-wire, an upstream traction catheter and a downstream traction catheter, and at least one attachment system compressible radially between an expanded condition and a compressed condition. The guidewire may be placed to run between a first access point in the vascular structure located superior to the defective portion of the vessel to be repaired, and a second access point located inferior to the defective portion of the vessel. By using the traction catheters releasably connected to the graft, the graft in a compressed condition is fed over the guidewire to a desired position within the vascular structure, whereupon the graft is released from its compressed condition to revert toward its uncompressed condition. While maintaining the graft in a desired position by applying traction forces through the traction catheters to both ends of the graft, at least one attachment system in compressed condition is fed over the guidewire to a desired position within the graft, whereupon the attachment system is expanded to its expanded condition. In the preferred embodiment, all elements of the repair are introduced into the vascular system by direct percutaneous insertion. When the required number of attachment systems have been inserted and expanded within the graft, the traction catheters are released from the graft and are withdrawn from the vascular system together with the guidewire, leaving the graft attached to the vascular wall.
- Another aspect of the present invention provides a device and a method for repairing, by direct percutaneous delivery of the graft and attachment system, a bifurcated vascular structure having an aortic branch and left and right iliac branches projecting from the aortic branch at a point of bifurcation. A method in accordance with this aspect of the present invention includes the use of a bifurcated graft foldable between an uncompressed condition and a compressed condition and having a superior trunk and left and right inferior legs or leg portions projecting from the superior trunk at a point of bifurcation, a first and a second guidewire, an upstream traction catheter, a left downstream and a right downstream traction catheter, and at least one attachment system, compressible radially between an expanded condition and a compressed condition. The first guidewire is configured to run between a first access point superior to the aortic branch of the vascular structure and a second access point inferior to one of the iliac branches of the vascular structure. The second guide wire is configured to run between the second access point and a third access point inferior to the other iliac branch of the vascular structure. By using the upstream traction catheter releasably connected to the graft, the graft in a compressed condition is fed over the first guidewire to a desired position within the vascular structure. By using the left and right downstream traction catheters releasably connected to the left and right inferior legs of the graft respectively, the left and right inferior legs of the graft may be pulled into the left and right iliac branches of the vascular structure. Once located at the desired position within the vascular system, the graft may be released from its compressed condition. While maintaining the graft in its desired position by applying appropriate tension to at least one traction catheter, at least one attachment system in compressed condition may be fed over one of the guidewires to a desired position within the graft, whereupon the attachment system may be expanded or allowed to expand. When the required number of attachment systems have been inserted and expanded within the graft, the traction catheters are released from the graft and are withdrawn from the vascular system together with the guidewires, leaving the bifurcated graft attached to the vascular wall. In the preferred embodiment, all elements of the repair are introduced into the vascular system by direct percutaneous insertion.
- By allowing the graft to be delivered at a different stage than the attachment system (or attachment systems), the diameter of the capsule or sheath delivering the graft may be reduced. Furthermore, it will be appreciated that, because the graft of the present invention may be pulled, rather than pushed, into position, the delivery capsule does not suffer adversely from the reduced resistance to kinking which otherwise follows from its reduced diameter. On the contrary, the reduction in diameter of the delivery capsule, combined with its placement by a traction force, allows greater flexibility which has the advantage of facilitating delivery of the graft through the branches of the vascular system. It also has the advantage, in suitable cases, of permitting delivery of the graft by a direct percutaneous insertion, without the need for a further surgical procedure to provide access into the vascular system of the patient. If such a surgical procedure can be avoided, it may be possible to use the procedure of minimally invasive luminal repair in a wider range of situations by a wider range of medical personnel. For example, it may be used as an outpatient procedure in which the patient is not hospitalized. It will be appreciated that outpatient treatment in this context will be considerably less costly than inpatient treatment to achieve the same result, and will be substantially more convenient for the patient.
- Other features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.
-
FIG. 1 is a sectional schematic view of the vascular system of a patient, showing the relationship of the aorta to the renal, axillary, iliac and femoral arteries, and also showing a guidewire configured to run between access points in the left axillary and the right femoral arteries; -
FIG. 2 is a perspective view of the repair assembly, showing the graft compressed by a sheath; also shown are the relative positions of the upstream and downstream traction catheters and guidewire, prior to insertion into the vascular system; -
FIG. 2 a is a section through the upstream catheter, sheath and guidewire ofFIG. 2 ; -
FIG. 3 is a schematic view showing the guidewire ofFIG. 1 threaded downwards through an upstream traction catheter, through the bore of a tubular graft, and exiting the graft at its inferior end; a collection catheter is also shown, threaded over the guidewire from the first access point; -
FIG. 3 a is a sectional view of the releasable connection between the collection catheter and the upstream traction catheter; -
FIG. 4 is a perspective view of the repair assembly after it has been pulled superiorly by the upstream traction catheter until the graft is located in the aorta, shown here in section; -
FIG. 5 is a perspective view showing the graft in an uncompressed condition within the aorta after the sheath has been withdrawn, while held in position by the upstream and downstream traction catheters; -
FIG. 6 is a perspective view of the graft (shown cut away) ofFIG. 5 , with a delivery assembly being introduced over the guidewire; -
FIG. 6 a is a cross-sectional view of the delivery assembly ofFIG. 6 , showing an attachment system contained in a compressed condition by a sheath, and releasably connected to a pushrod; -
FIG. 7 is a perspective view of the graft ofFIG. 6 , in which the attachment system is shown in its expanded condition; -
FIG. 7 a is a perspective view of the embodiment of the attachment system shown inFIGS. 7, 14 and 15. -
FIG. 7 b is a perspective view of an alternative embodiment of an attachment system suitable for use with the present invention. -
FIG. 8 is a sectional schematic view of the vascular system of a patient, showing the relationship of the aorta to the renal, axillary, iliac and femoral arteries, and also showing a first guidewire and a second guidewire configured to run between access points in the arteries; -
FIG. 9 is a schematic view showing the first and second guidewires ofFIG. 8 and their relationship to a bifurcated graft and upstream and downstream traction catheters, before they are introduced into the vascular system; a relay catheter is also shown, threaded over the second guidewire entering the vascular system from the third access point and exiting at the second access point; -
FIG. 9 a is a sectional view through the relay catheter ofFIG. 9 after it has been passed over the second-guidewire, and showing an empty lumen ready to receive the left downstream traction catheter; -
FIG. 10 is a schematic view of the assembly shown inFIG. 9 , after the left downstream traction catheter has been configured to run between the second and third access points; -
FIG. 11 is a perspective view of the bifurcated graft shown inFIGS. 9 and 10 , after it has been enclosed by a sheath confining the graft in a compressed condition; -
FIG. 11 a is a sectional view of the right downstream traction catheter, showing the second guidewire threaded through a lumen; -
FIG. 12 is a perspective view of the graft in compressed condition within the aorta (shown cut away) before the graft is finally positioned, and showing the relationship between the graft, the sheath, the traction catheters and the guidewires; -
FIG. 13 is a perspective view of the bifurcated graft ofFIG. 12 , after the graft has been pulled inferiorly to allow the left and right inferior legs of the graft to enter the left and right iliac arteries respectively; a sheath is also shown, partially removed, confining the graft in a compressed condition; -
FIG. 14 is a perspective view (cut away) of the bifurcated graft ofFIG. 13 after the sheath has been removed and after an attachment system has been deployed within the bore of the graft; and -
FIG. 15 is a perspective view (cut away) of the bifurcated graft ofFIG. 14 with attachment systems deployed within the bore of the graft's superior trunk, and within the left and the right inferior legs. -
FIG. 16 is a schematic view (cut away) of the bifurcated graft ofFIG. 15 shown in combination with the embodiment of the attachment system shown inFIG. 7 b. - The device and method disclosed by the present invention may be used to deliver to a patient's vascular system a flexible tubular graft which may be straight, tapered, or bifurcated. In the preferred embodiment of this invention, the graft may be delivered to the patient's vascular system without performing surgery on the patient to open the vessel prior to insertion of the graft; rather, insertion is achieved percutaneously over a guidewire using the Saldinger technique or with a small diameter introducer sheath. Alternatively, insertion is achieved by applying force to the skin and vessel of the patient with the tapered end of the repair assembly sufficient to gain direct entry into the vessel. This method of insertion is referred to herein as the “direct percutaneous” method of insertion.
- The terms “superior” and “inferior” shall be used herein to have the same meaning as the terms “up” and “down” respectively and shall signify ends or directions which are towards and away from the patient's head, respectively. The terms “right” and “left” shall be used herein to signify ends or directions which are toward the patient's right and left sides, respectively. It should be noted that in the anatomical drawings provided herein, the patient faces the reader.
- As exemplified in
FIG. 1 , implantation of a straight or tapered graft according to the preferred embodiment of the present invention includes the use of aguidewire 30 with ansuperior end 32 aninferior end 34, which is configured to run between two access points of the patient's vascular system. In the preferred embodiment, if the vascular structure to be repaired is theaorta 40, thefirst access point 36 is in the leftaxillary artery 42 and thesecond access point 38 is in the rightfemoral artery 44. Additionally, the insertion of all elements of repair is accomplished by percutaneous or direct percutaneous insertion in the preferred embodiment. In other embodiments, the right axillary or the left femoral artery may be used, or alternatively any points of access on opposite sides of the defective vascular structure may be used. - As exemplified in
FIGS. 2, 2 a and 3, in the preferred embodiment of the present invention, arepair assembly 46 is provided, comprising anupstream traction catheter 48 with ansuperior end 50 and aninferior end 52 and having a plurality of internal lumens; adownstream traction catheter 54 with ansuperior end 56 and aninferior end 58 and having a plurality of lumens, and; agraft 60 foldable radially between a compressed condition and an uncompressed condition and having ansuperior end 62 and aninferior end 64. In addition, the repair assembly includes asheath 74, although it is also contemplated that the sheath can be omitted when it is desirable to do so. - Grafts are preferably formed from a biocompatible material having sufficient strength to withstand the implantation procedure described herein, and to endure the biomechanical forces that will be imposed on the graft. Such materials may include polyester materials such as DACRON, polytetrafluoroethylene, polyester materials, and silicone. Grafts are preferably made from material formed into woven fabric. The inferior end of the upstream traction catheter is releasably connected to the superior end of the graft. The superior end of the downstream traction catheter is releasably connected to the inferior end of the graft. There are numerous releasable connections known in the art.
- The
repair assembly 46 shown inFIG. 2 is assembled as follows. As exemplified inFIG. 3 , when theguidewire 30 has been configured within the vascular system as described, protruding from the access points 36, 38, itsinferior end 34 is threaded downwards first through a lumen of theupstream traction catheter 48 and then through the bore of thetubular graft 60. Atubular sheath 74, shown inFIG. 2 , is configured to enclose and confine thegraft 60 in a compressed condition, and to slidably disengage from the graft. (For the sake of clarity, thetubular sheath 74 is not shown inFIG. 3 , but, if it had been shown at the stage of assembly exemplified inFIG. 3 , it would be shown having been pulled upwards over theupstream traction catheter 48 prior to being pulled downwards over thegraft 60 to hold the graft in compressed condition, as exemplified inFIG. 2 .) In a preferred embodiment of the sheath, the sheath also slidably encloses theupstream traction catheter 48. In another embodiment, the sheath may enclose thedownstream catheter 54 rather than the upstream catheter. In the preferred embodiment, the diameter of the sheath varies, having substantially one diameter extending over that portion of the sheath surrounding the graft, and having another smaller diameter extending over that portion of the sheath surrounding the traction catheter. In a further embodiment, the sheath may have a uniform diameter. Typical materials for forming the sheath include, for example, nylon, teflon, polytetrafluoroethylene, polythene and like materials. Before the graft is inserted in the vascular system, a portion of the sheath surrounding the upstream traction catheter is connected to the upstream traction catheter, thereby preventing relative axial movement between sheath and graft and preventing premature release of the graft. - The
upstream traction catheter 48 is then moved in an superior direction over theguidewire 30, eventually exiting through thefirst access point 36. This movement may be achieved by pushing the upstream traction catheter over the guide wire from thesecond access point 38 into the vascular system of the patient, until it protrudes from thefirst access point 36. Alternatively, as exemplified inFIG. 3 , acollection catheter 66 withsuperior end 68 andinferior end 70 may be passed over the guidewire from the first access point until the collection catheter protrudes from the second access point. The inferior end of the collection catheter is then releasably connected to thesuperior end 50 of theupstream traction catheter 48 using any means of connection which is known in the art. A preferred means of releasable connection is to screw theinferior end 70 of the collection catheter tothreads 72 provided on the superior end of the upstream traction catheter, as exemplified inFIG. 3 a. The collection catheter is then withdrawn superiorly through thefirst access point 36, thereby pulling the upstream traction catheter into the patient's vascular system, until it eventually protrudes from the first access point, whereupon the collection catheter is disconnected from the upstream traction catheter. Once either method described above has been used to advance the upstream traction catheter superiorly over the guidewire until its superior end protrudes from the first access point, differential tension may be applied to the upstream and thedownstream traction catheters aorta 40, as exemplified inFIG. 4 . - The position of the
repair assembly 46 andgraft 60 within the vascular system may be ascertained by using flouroscopic methods that are known in the art. For example, a radio-opaque marker 78 may be attached to the inferior end of thesheath 74, as exemplified inFIG. 4 . The marker may take the form of an annular ring formed from a metal, such as stainless steel or platinum-iridium, or may consist of any radio-opaque material. Once located in the desired position, the sheath is withdrawn by sliding it superiorly, over the upstream traction catheter and over the graft, thereby releasing the graft from its compressed condition and allowing it to revert to its uncompressed condition, as exemplified inFIG. 5 . The graft may contain further radio markers to facilitate its final positioning. - Next, one or more attachment systems, compressible radially between a compressed condition and an uncompressed condition, are introduced into the bore of the uncompressed graft in order to engage the graft with the vascular wall. There are many types of attachment systems, or anchors, known in the art that will achieve the result of fixing the graft to the vascular wall. Such attachment systems may be self-expanding, may be manufactured from shape memory alloy such as Nitinol, and may include hooks or barbs. Alternatively, the attachment systems or anchors may be expandable by a balloon catheter.
- As exemplified in
FIGS. 6 and 6 a, the step of introducing an attachment system into the bore of the graft is achieved by inserting the attachment system into adelivery assembly 80 which is then introduced into the bore of the graft over theguidewire 30. As exemplified inFIG. 6 a, the delivery assembly includes apushrod 82 havingsuperior end 83 and aninferior end 85 and at least one lumen, and a sheath orjacket 84 surrounding the pushrod and extending superiorly to provide a cover which applies a radially compressive force (If the attachment system is self-expanding) to theattachment system 76 which is releasably connected to the superior end of the push rod. In the preferred embodiment the diameter of the sheath varies, having substantially one diameter extending over that portion of the sheath surrounding the attachment system, and having another smaller diameter extending over that portion of the sheath surrounding the pushrod. The sheath may be manufactured from the same material as thegraft sheath 74, and operates to first confine the attachment system in a compressed condition and then to release the attachment system when the sheath is slidably removed inferiorly over thepushrod 82. Theattachment system 76 is delivered to the correct position within the bore of the graft by applying an superior force to the pushrod, which slides over theguidewire 30 to the enter the bore of thegraft 60. - During insertion of the attachment system into the bore of the graft, the graft may be held in a fixed position by applying the appropriate tension forces to the two
traction catheters delivery assembly 80 is being pushed over theguidewire 30, the sheath and the pushrod are connected to each other to prevent relative axial movement between the attachment system and the sheath, thereby avoiding premature expansion of the attachment system. The position of the attachment system in relation to the vascular structure may be determined by using flouroscopic methods such as those described above in relation to positioning the graft. When the attachment system has reached the desired position, the sheath is withdrawn by sliding it inferiorly over the pushrod while holding the pushrod in place. As exemplified inFIG. 7 , withdrawing the sheath allows theattachment system 76 to expand radially (either as a self-expanding or balloon expanded attachment system) to an expanded condition in which it exerts an outward radial force on thegraft 60 sufficient to attach the graft to thevascular wall 40. Such attachment may be either frictional or by means of barbs connected to the attachment system which penetrate the graft fabric and the vascular wall. - In one embodiment of a self expanding attachment system suitable for use with the present invention, an attachment system may be used which is made from a piece of wire which is bent in a generally undulating form and configured to have a generally cylindrical profile. This embodiment of self-expanding
attachment system 76 is exemplified in a deployed state inFIG. 7 (and also asattachment system 76′ inFIGS. 14 and 15 ), and is exemplified in full perspective in greater detail inFIG. 7 a. The wire undulates betweenproximal apices 86 anddistal apices 87 which are joined by connectinglegs 88. At each apex, the wire may include ahelical loop 89, to provide a greater range of expansion within the elastic range of the wire.Hooks 90 may be connected to each proximal apex by welding or gluing or other suitable connecting means, to enhance the ability of the attachment system to attach to the vascular wall. - In another embodiment, an
attachment system 92 suitable for using with the present invention, exemplified inFIG. 7 b, may be manufactured from a continuous cylinder into which a pattern may be cut by a laser or by chemical etching to produce slits in the wall of the cylinder. The resulting structure may thereafter be heat set to give it a desired final configuration. The preferred final configuration includes a shape which undulates betweenproximal apices 93 anddistal apices 94 which are joined by connectinglegs 95.Hooks 96 may be added, either by shaping them from the continuous cylinder, or by welding or gluing them on. - It will be appreciated by one of skill in the art that, in the configurations of these previously described two embodiments, when the attachment system is compressed, its legs and apices are urged radially outward in a direction generally at right angles to its axis. Preferably, the self-expanding attachment systems of both described embodiments are made from a material having highly elastic properties such as nickel-titanium alloys, including Nitinol, since the same allows a great amount of expansion and compression of structures without permanent deformation. Implantable stainless steel is also known to be satisfactory for the purpose. An additional material from which such attachment system may be manufactured is Elgiloy™ which is a chromium-cobalt-nickel alloy manufactured and sold by Elgiloy of Elgin, Ill.
- It will be appreciated that, as long as the
guidewire 30 protrudes from thesecond access point 38 and runs within the bore of theuncompressed graft 60, and thetraction catheters - Once the required number of attachment systems have been deployed within the graft, the traction catheters are released from their connection to the graft and are removed together with the guidewire, leaving the graft fixedly supported by the attachment systems within the vascular system.
- Although the description of the aspect of the present invention set forth above relates to the staged implantation of a tubular or tapered graft, another aspect of the invention includes a device and method for the staged implantation of a bifurcated graft into a bifurcated vascular structure. As exemplified in
FIG. 8 , the method of implanting a bifurcated graft commences with placing within the vascular system afirst guidewire 30′ with ansuperior end 32′ and aninferior end 34′ and asecond guidewire 100 with aright end 102 and aleft end 104. In the preferred embodiment, if the vascular structure to be repaired is the aorta, thefirst access point 36′ is in the left axillary artery and thesecond access point 38′ is in the right femoral artery. In alternative embodiments, the right axillary or the left femoral artery may be used, or any points of access superior and inferior to the defective vascular structure may be used. In alternative embodiments, the steps set out below will have to be modified to accommodate the changes from left to right, and right to left, as may be necessary. In the preferred embodiment, the second guidewire is configured to run between the second access point and athird access point 106 in the left femoral artery. - Then, as exemplified in
FIGS. 9, 10 and 11, arepair assembly 46′ is provided and assembled, comprising anupstream traction catheter 48′ with ansuperior end 50′ andinferior end 52′, and abifurcated graft 108 having ansuperior trunk 110 with an superior 112 end, a rightinferior leg 114 and a leftinferior leg 118 each withinferior ends downstream traction catheter 54′ and a leftdownstream traction catheter 122 are provided, each withsuperior ends 56′, 124 and inferior ends 58′, 126 and having a plurality of lumens. The repair assembly also includes asheath 74′, although it is contemplated that the sheath may be omitted when it is desirable to do so. (For the sake of clarity, thesheath 74′ is not shown inFIGS. 9 and 10 , but, if it had been shown at the stage of assembly exemplified inFIGS. 9 and 10 , it would be shown having been pulled upwards over theupstream traction catheter 48′ prior to being pulled downwards over thegraft 108 to hold the graft in compressed condition.) As exemplified inFIG. 9 , the following steps are undertaken outside the patient's body to assemble the repair assembly: Theinferior end 52′ of theupstream traction catheter 48′ is releasably connected to thesuperior end 112 of the graft'ssuperior trunk 110. Thesuperior end 56′ of the rightdownstream traction catheter 54′ is releasably connected to theinferior end 116 of the graft's rightinferior leg 114. Thesuperior end 124 of the leftdownstream traction catheter 122 is releasably connected to theinferior end 120 of the graft's leftinferior leg 118. Then, still proceeding outside the patient's body, theinferior end 34′ of thefirst guide wire 30′, which at this stage is protruding from thesecond access point 38′, is threaded downward first through a lumen of the upstream traction catheter, then downward through the bore of thegraft 108, entering the graft at thesuperior trunk 110 and passing out of the graft through the rightinferior leg 114. Next, theright end 102 of thesecond guidewire 100 is threaded first through the bore of the graft, entering the graft through the graft's leftinferior leg 118 and exiting at the end of the rightinferior leg 114, from where it may be threaded into a lumen of the rightdownstream traction catheter 54′. It is not essential that the second guidewire be threaded into a lumen of the right downstream traction catheter, but doing so helps prevent the guidewire from subsequently becoming twisted around the traction catheter. - It is desired that the left
downstream traction catheter 122 and thesecond guidewire 100 be configured to enter thesecond access point 38′, as exemplified inFIG. 10 , and to protrude from thethird access point 106 without being twisted around each other within the vascular system. In the preferred method of achieving this configuration, a relay catheter 128 (shown inFIG. 9 ) with a plurality oflumens 129 may be passed over the second guidewire, so that it protrudes from both second andthird access points 38′, 106. A sectional view of the relay catheter at this stage of the procedure is exemplified byFIG. 9 a. Theleft end 126 of the leftdownstream traction catheter 122 is then passed from right to left through one of theopen lumens 129 of the relay catheter, until the left downstream traction catheter emerges from thethird access point 106, whereupon the relay catheter may be withdrawn leftwards from the vascular system to expose both thesecond guidewire 100 and the leftdownstream traction catheter 122 passing between the second andthird access points 38′, 106 as desired, without twisting, as exemplified inFIG. 10 . - Before introducing the graft into the vascular system, the graft is enclosed in a
sheath 74′, which extends superiorly to slidably surround theupstream traction catheter 48′, as exemplified inFIG. 11 . As in the case of thesheath 74 used to deliver the straight or tapered graft, thesheath 74′ used to deliver a bifurcated graft may have a varying diameter, and may be constructed from the same materials. - Having thus fully assembled the
repair assembly 46′, theupstream traction catheter 48′, surrounded by thesheath 74′, is then introduced into the vascular system at thesecond access point 38′ until it protrudes from thefirst access point 36′. This result may be achieved in the same manner used to introduce theupstream catheter 48 in the case of the straight or tapered graft, that is, either by threading the upstream traction catheter upwards over the first guidewire or by passing a collection catheter downwards over the first guidewire, and releasably connecting the upstream catheter to the collection catheter before withdrawing the collection catheter upwards until the upstream traction catheter emerges from the first access point. - As exemplified in
FIG. 12 , the next step is to draw therepair assembly 46′ into the vascular system of the patient. This may be achieved by applying an superiorly directed traction force to theupstream traction catheter 48′ until thebifurcated graft 108 in compressed condition is situated in the aorta with the inferior ends of the graft'sinferior legs downstream traction catheters 48′, 122 until the graft is located in the desired position within the vascular system, as exemplified inFIG. 13 . - Once the bifurcated graft is located in a desired position within the aorta, the
sheath 74′ may be slidably removed by withdrawing it superiorly over theupstream traction catheter 48′, allowing the graft to revert to its uncompressed condition, as exemplified inFIG. 14 . Then, following a technique similar to that disclosed in the case of the straight or tapered graft above, at least one attachment system compressible radially between a compressed condition and an uncompressed condition is provided, and is fed into the vascular system in a compressed condition over the first or the second guidewire within a delivery assembly which includes a sheath or jacket to confine the attachment system in a compressed condition. Using the same flouroscopic technique as disclosed above, the attachment system is located at a desired position within the bore of the graft, and is then expanded or allowed to expand by removing the sheath. As exemplified inFIGS. 14 and 15 ,attachment systems 76′, 130, 132 maybe inserted over the first or the second guidewires into the bore of thegraft 108. The graft may be maintained in a fixed position during delivery of the attachment systems by applying appropriate traction forces to at least two of the traction catheters, 48′, 54′, 122. Once the desired number of attachment systems have been positioned within the graft, the traction catheters are removed together with the guidewires, leaving the graft attached to the vascular wall.FIG. 16 exemplifies thegraft 108 ofFIG. 15 , and shows the second embodiment of theattachment system 92 in deployed position in the superior trunk and further embodiments of attachment systems 134, 136 in the inferior legs of the graft. - It will be apparent from the foregoing that, while particular forms of the invention have been illustrated and described, various modifications can be made without departing from the spirit and scope of the invention. For example, at the stage when an attachment system is fed into the vascular system over a guidewire, it is not essential to the invention that the guidewire protrude from the access point opposite to the access point into which the attachment system is fed. What is essential is that the guidewire should run into the bore of the graft through the appropriate
inferior leg 114 or 118 (in the case of the bifurcated graft), and should extend upward into the bore of the graft as far as is necessary to implant the attachment system within the graft. For instance, the second-guide wire 100 may be repositioned by withdrawing it leftwards until itsright end 102 is positioned in the leftinferior leg 118 of the bifurcated graft, and by then pushing the guidewire upwards until its right end is positioned within the graft'ssuperior trunk 110, or beyond. Such repositioning may assist in placing attachment systems within the left inferior branch of the bifurcated graft. Moreover, it is not essential to the invention that the graft be introduced through the second access point, but may equally be introduced through the third access point if the necessary changes are made to the points of entry/exit of the guidewires and traction catheters. Furthermore, while the preferred embodiment described above is used to implant a graft in the aorta, alternative embodiments may be used to implant a graft in any lumen of the body. - Furthermore, instead of using self-expanding attachment systems, balloon expanded attachment systems may be used.
- Accordingly, it is not intended that the invention be limited, except as by the appended claims.
Claims (10)
1. A method for the percutaneous insertion of a graft supported by at least one attachment system within the vascular system of a patient, the graft capable of assuming a compressed condition and an uncompressed condition, and the at least one attachment system being compressible radially between a compressed and an expanded condition, the method comprising:
percutaneously inserting the graft into the vascular system;
positioning the graft adjacent a diseased portion of the vascular system;
subsequently inserting at least one attachment system into the graft; and
implanting the attachment system in the graft to form a seal between the graft and the vascular wall.
2. The method of claim 1 , wherein the feeding step includes:
feeding the graft into the vascular system by direct percutaneous insertion; and
thereafter, feeding the at least one attachment system into the vascular system by direct percutaneous insertion.
3. The method of claim 2 , wherein the graft feeding step includes:
inserting the graft in compressed condition by direct percutaneous insertion into a point of access to the vascular system over a prepositioned guidewire;
applying a traction force to opposing ends of the graft to control the position of the graft within the vasculature; and
activating the graft from its compressed condition to its uncompressed condition.
4. The method of claim 2 , wherein the attachment system feeding step includes:
applying a traction force to opposing ends of the graft to control the position of the graft within the vasculature;
inserting the at least one attachment system in compressed condition by direct percutaneous insertion into a point of access to the vascular system over a prepositioned guidewire;
positioning the at least one attachment system within the bore of the graft;
activating the at least one attachment system from its compressed condition to its expanded condition.
5. The method of claim 4 , wherein the traction force applying step is carried out using a plurality of catheters, each catheter configured to exert a force on the graft from a different point outside the vasculature.
6. The method of claim 5 , wherein the graft is configured to have a substantially cylindrical profile having an superior end and a inferior end, and wherein a first catheter having a first end and a second end is releasably connected by the first end to the superior end of the graft and configured so that the second end thereof extends through a point of access to the vasculature located in the left axillary artery, and wherein a second catheter having a first end and a second end is releasably connected by the first end to the inferior end of the graft and configured so that the second end thereof extends through a point of access to the vasculature located in an iliac artery.
7. The method of claim 5 , wherein the graft is configured to have a bifurcated profile having an superior trunk with an superior end and first and second inferior legs each with an inferior end, and wherein a first catheter having a first end and a second end is releasably connected by the first end to the superior end of the graft and configured so that the second end thereof extends through a point of access to the vasculature in the left axillary artery, a second catheter having a first end and a second end is releasably connected by the first end to the inferior end pf the first leg and configured so that the second end thereof extends through a point of access to the vasculature in a first iliac artery, and a third catheter having a first and second end is releasably connected by the first end to the second leg's inferior end and configured so that the second end thereof extends through a point of access to the vasculature in a second iliac artery.
8. A system for delivering a graft within the vasculature of a patient, comprising:
a graft capable of assuming a compressed condition and an uncompressed condition, wherein the graft does not include an expandable frame attached thereto; and
a plurality of catheters having first ends and second ends, each the first end being releasably connected to the graft, and each the second end configured to extend through a separate point of access to the vasculature.
9. The system of claim 8 , wherein the graft is configured to have a substantially cylindrical profile having an superior end and a inferior end, and wherein the plurality of catheters comprises:
a first catheter having a first end and a second end releasably connected by the first end to the graft's superior end and configured for the second end thereof to extend through a point of access to the vasculature located in the left axillary artery; and
a second catheter having a first end and a second end releasably connected by the first end to the graft's inferior end and configured for the second end thereof to extend through a point of access to the vasculature located in an iliac artery.
10. The system of claim 8 , wherein the graft is configured to have a bifurcated profile having an superior trunk with an superior end and first and second inferior legs each with an inferior end, and wherein the plurality of catheters comprises:
a first catheter having a first end and a second end, wherein the first catheter is releasably connected by the first end to the graft's superior end and is configured for the second end thereof to extend through a point of access to the vasculature in the left axillary artery;
a second catheter having a first end and a second end, wherein the second catheter is releasably connected by the first end to the first leg's inferior end and is configured for the second end thereof to extend through a point of access to the vasculature in a first iliac artery; and
a third catheter having a first and second end, wherein the third catheter is releasably connected by the first end to the second leg's inferior end and is configured for the second end thereof to extend through a point of access to the vasculature in a second iliac artery.
Priority Applications (1)
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US10/866,617 US20050033400A1 (en) | 1999-10-06 | 2004-06-12 | Device and method for staged implantation of a graft for vascular repair |
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US10/866,617 US20050033400A1 (en) | 1999-10-06 | 2004-06-12 | Device and method for staged implantation of a graft for vascular repair |
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US9572652B2 (en) | 2009-12-01 | 2017-02-21 | Altura Medical, Inc. | Modular endograft devices and associated systems and methods |
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US10285833B2 (en) | 2012-08-10 | 2019-05-14 | Lombard Medical Limited | Stent delivery systems and associated methods |
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