US20090306768A1 - Percutaneous valve prosthesis and system and method for implanting same - Google Patents
Percutaneous valve prosthesis and system and method for implanting same Download PDFInfo
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- US20090306768A1 US20090306768A1 US12/309,680 US30968007A US2009306768A1 US 20090306768 A1 US20090306768 A1 US 20090306768A1 US 30968007 A US30968007 A US 30968007A US 2009306768 A1 US2009306768 A1 US 2009306768A1
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- valve
- stent
- cage stent
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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
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2412—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with soft flexible valve members, e.g. tissue valves shaped like natural valves
- A61F2/2418—Scaffolds therefor, e.g. support stents
-
- 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
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2427—Devices for manipulating or deploying heart valves during implantation
- A61F2/2436—Deployment by retracting a sheath
-
- 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
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2427—Devices for manipulating or deploying heart valves during implantation
- A61F2/2439—Expansion controlled by filaments
-
- 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
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0028—Shapes in the form of latin or greek characters
- A61F2230/0054—V-shaped
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/006—Additional features; Implant or prostheses properties not otherwise provided for modular
Definitions
- the present invention relates to heart valve prostheses, preferably to aortic valve prostheses. More specifically, the invention relates to heart valve prostheses that can be implanted percutaneously by means of a catheter from a remote Location without opening the chest cavity.
- Heart valve surgery is used to repair or replace diseased heart valves.
- Valve surgery is an open-heart procedure conducted under general anesthesia. An incision is made through the patient's sternum (sternotomy), and the patient's heart is stopped while blood flow is rerouted through a heart-lung bypass machine.
- Valve replacement may be indicated when there is a narrowing of the native heart valve, commonly referred to as stenosis, or when the native valve leaks or regurgitates.
- the native valve When replacing the valve, the native valve is excised and replaced with either a biologic or a mechanical valve.
- Mechanical valves require lifelong anticoagulant medication to prevent clot formation around the valve, which can lead to thromboembolic complications and catastrophic valve failure.
- Biologic tissue valves typically do not require such medication.
- Tissue valves can be obtained from cadavers (homografts) or can be from pigs (porcine valve) and cows (bovine pericardial valves). Recently equine pericardium has also been used for making valves. These valves are designed to be attached to the patient using a standard surgical technique.
- Valve replacement surgery is a highly invasive operation with significant concomitant risk. Risks include bleeding, infection, stroke, heart attack, arrhythmia, renal failure, and adverse reactions to the anesthesia medications, as well as sudden death. Two to five percent of patients die during surgery.
- PVT Percutaneous Valve Technologies
- U.S. Pat. Nos. 5,411,552, 5,840,081, 6,168,614, and 6,582,462 to Anderson et al.
- the stent/valve device is deployed across the native diseased valve to permanently hold the valve open, thereby alleviating a need to excise the native valve and to position the bioprosthetic valve in place of the native valve.
- PVT's device is designed for delivery in a cardiac catheterization laboratory under local anesthesia using fluoroscopic guidance, thereby avoiding general anesthesia and open-heart surgery. The device was first implanted in a patient in April of 2002.
- PVT's device suffers from several drawbacks. Deployment of PVT's stent has several drawbacks, including that there is very little control over its deployment. This lack of control can endanger the coronary ostea above the aortic valve and the anterior leaflet of the mitral valve below the aortic valve.
- PVT device Another drawback of the PVT device is its relatively large cross-sectional delivery profile. This is largely due to fabricating the tri-leaflet pericardial valve inside a robust stainless steel stent. Considering they have to be durable, the materials for the valve and the stent are very bulky, thus increasing the profile of the device.
- the PVT system's stent/valve combination is mounted onto a delivery balloon, making retrograde delivery through the aorta challenging. An antegrade transseptal approach may therefore be needed, requiring puncture of the septum and routing through the mitral valve, which significantly increases complexity and risk of the procedure. Very few cardiologists are currently trained in performing a transseptal puncture, which is a challenging procedure by itself.
- PVT device Another drawback of the PVT device is its lack of fixation provision. It in effect uses its radial force to hold the stent in the desired position. For this to work, sufficient dilatation of the valve area has to be achieved; but this amount of dilation can cause damage to the annulus. Also, due to its inability to have an active fixation mechanism, the PVT device cannot be used to treat aortic regurgitation.
- Another drawback to this system is that it does not address the leakage of blood around the implant, after its implantation.
- the anchoring mechanism is not actively provided (that is, there is no method of fixation other than the use of radial force and barbs that project into the surrounding tissue and not used as positioning marker (that is, markers seen under fluoroscopy to determine the position of the device).
- the stent disclosed in U.S. Pat. No. 6,425,916 to Garrison simply crushes the native valve leaflets against the heart wall and does not engage the leaflets in a manner that would provide positive registration of the device relative to the native position of the valve. This increases an immediate risk of blocking the coronary ostia, as well as a longer-term risk of migration of the device post-implantation.
- the stent comprises openings or gaps in which the replacement valve is seated post-delivery. Tissue may protrude through these gaps, thereby increasing a risk of improper seating of the valve within the stent.
- Sadra et al. (U.S. published application No. 20050137701) describes a mechanism for anchoring a heart valve, the anchoring mechanism having an actuation system operated remotely. This mechanism addresses the fixation issue; however, considering the irregular shape of the aortic annulus there is a real potential for deforming the prosthetic valve annulus; this may require additional balloon angioplasty to give it its final shape, and also make the new valve more prone to fatigue and fracture. Moreover if full expansion of the stent is prone to deformation, the leaflet coaptation of the valve will be jeopardized.
- Sadra et al (U.S. published application No. 20050137691) describes a system with two pieces, a valve piece and an anchor piece.
- the valve piece connects to the anchor piece in such a fashion that it will reduce the effective valve area considerably.
- Valve area i.e., the inner diameter of the channel after the valve leaflets open, is of prime importance when considering an aortic valve replacement in a stenotic valve.
- Garrison's valve is also implanted in the inner portion of the stent, compromising the effective valve outflow area. Sadra et al's and Garrison's valves overlook this very critically important requirement.
- a heart valve prosthesis comprising a cylindrical valve cage stent constructed to be implanted percutaneously in the planar axis of a native valve annulus, the valve cage stent having a superior rim; and an elastic and compressible, multi-leaflet valve insertable percutaneously into the body, the valve including a valve frame made from a memory metal and a tissue cover attached to the valve frame; and attachment means for attaching the valve to the superior rim of the valve cage.
- FIG. 1 is a diagram of a valve prosthesis in accordance with the present invention.
- FIG. 2B is a diagrammatic plan view of a tissue cover for the frame of FIG. 2A .
- FIG. 2C is a diagrammatic plan view of an assembled bi-leaflet percutaneous heart valve in accordance with the present invention, incorporating the frame of FIG. 2A and the tissue cover of FIG. 2B .
- FIG. 2D is a diagrammatic side elevational view of the bi-leaflet percutaneous heart valve of FIG. 2C in the open position.
- FIG. 2F is a top perspective view of an assembled bi-leaflet percutaneous heart valve in accordance with the present invention, in the closed position.
- FIG. 2K is a partial perspective view of the bi-leaflet percutaneous heart valve of FIG. 2F mounted on the valve cage stent of FIG. 2I , with the valve in the closed position.
- FIG. 3C is a perspective view of an assembled tri-leaflet percutaneous heart valve in accordance with the present invention, incorporating the frame of FIG. 3A and the tissue cover of FIG. 3B
- FIG. 3H is a partially cut-away perspective view of the tri-leaflet percutaneous heart valve of FIG. 3C mounted on the valve cage stent of FIG. 3D , in the undeployed condition.
- FIG. 3I is a partially cut-away perspective view of the tri-leaflet percutaneous heart valve of FIG. 3C mounted on the valve cage stent of FIG. 3D , in the deployed condition.
- FIGS. 4A-4G show the sequence of steps in implantation of the bi-leaflet percutaneous heart valve prosthesis of FIG. 2C in an aorta, in which the valve is attached to the valve cage stent outside the delivery catheter.
- FIGS. 5A-5I are diagrammatic representations of the sequence of steps in implantation of the bi-leaflet percutaneous heart valve of FIG. 2C , the aorta being omitted from all of FIGS. 5A-5I and the valve cage being omitted from FIGS. 5A-5F for clarity.
- FIGS. 6A-6J show the sequence of steps in implantation of the tri-leaflet percutaneous heart valve of FIG. 3C in an aorta, in which the valve is attached to the valve cage stent outside the delivery catheter.
- FIGS. 7A and 7B are exploded and assembled views, respectively, of the delivery system apparatus used in implantation of the bi-leaflet and tri-leaflet valves in accordance with the present invention.
- FIG. 7C is an end view of the flexible sheath of the delivery system apparatus of FIGS. 7A and 7B .
- FIG. 8 is a side view of a valve cage stent mounted on a balloon catheter.
- FIGS. 9A-9T show the sequence of steps in implantation of the tri-leaflet percutaneous heart valve of FIG. 3C in an aorta, in which the valve is attached to the valve cage stent within the delivery catheter.
- the present invention relates to heart valve prostheses that can be implanted percutaneously by means of a catheter from a remote location without opening the chest cavity.
- the valve prosthesis 10 comprises two parts, (1) a valve cage stent 20 constructed to be implanted in the planar axis of the native valve annulus, (2) an elastic and compressible valve 30 , and (3) an attachment mechanism for attaching the valve 30 to the superior rim of the above mentioned valve cage stent 20 .
- two types 110 and 210 of heart valve prosthesis 10 are contemplated, one type 110 incorporating an elastic and compressible bi-leaflet hinged valve 130 (shown in FIGS.
- FIGS. 3A-3C A system and method for implanting the valves (shown in FIGS. 4A-4G , 5 A- 5 I, and 6 A- 6 J) is also encompassed by the invention.
- the bi-leaflet tissue valve 130 comprises a two-part (that is, a two-leaflet) frame 132 made from a memory metal wire or strip and a tissue cover 133 .
- each part 132 a and 132 b of the frame 132 is substantially semicircular.
- Portions of each part 132 a and 132 b of the frame 132 are configured (for example, by having a sinusoidal configuration, shown by broken lines in FIGS. 2A and 2C ) so that each part 132 a and 132 b of the frame 132 , as well as the frame 132 as a whole, is expandable and compressible, while the remaining portions of the frame 132 are not expandable and compressible.
- Each part 132 a and 132 b of the frame 132 includes a slot 134 for receiving a hinge 135 having a shape when deployed that is similar to a lower-case “t”, as shown in FIGS. 2D and 2E , having two aims 135 a and 135 b and a stem 135 c.
- the slot 134 is formed unitarily with the frame 132 .
- the “t”-shaped hinge 135 is stamped out of memory metal (for example, nitinol) sheeting so that it is deformable.
- the arms 135 and 135 b of the hinge 135 have projections 135 d at their ends, which function as stops for the leaflets.
- the stem 135 c of the hinge 135 has a snap-on or screw-in mechanism 141 for attachment to a valve mount 142 (shown in FIGS. 2I-2L ), as described below.
- the tissue cover 133 (shown in FIG. 2B ) is made, for example, of equine or bovine pericardium, or various synthetic materials, for example, or medical grade silicone, fabric, or other compressible, materials, and is configured to cover the two parts 132 a and 132 b of the frame 132 with their straight sides in spaced apart relation, with a central aperture 133 a in the center for receiving the stem of the “t”-shaped hinge 135 and two side apertures 133 b in alignment with the slots 134 for receiving the arms 135 a and 135 b of the hinge 135 .
- the tissue cover 133 is sewn to each part 132 a and 132 b of the frame 132 , as shown in FIGS. 2 C and 2 F- 2 H, and thus connects the two parts 132 a and 132 b of the frame 132 in spaced-apart relation.
- the bi-leaflet valve 130 is detachably connected to a valve mount 142 (shown in FIGS. 2I and 21 ) via the “t”-shaped hinge 135 , as shown in FIGS. 2K-2N , 4 D- 4 G, and 5 G- 5 I.
- the valve mount 142 is also made from a memory metal so that it is collapsible.
- valve mount 142 has arms 142 a and 142 b on either side of a receptacle 142 c, which are folded up vertically when the valve cage stent 120 is in its compressed (undeployed) condition, the ends of the arms 142 a and 142 b being affixed to the valve cage stent 120 .
- the tri-leaflet tissue valve 230 comprises an expandable and compressible valve frame 232 (shown in FIG. 3A ) made from a memory metal wire or strip and a tissue cover 233 (shown in FIG. 3B and 3C ).
- the tissue cover 233 is made from the individual cusps of a porcine aortic valve sewn to appropriate fabric. Three identical cusps are selected. Two or more pigs are used to get ideal sized aortic cusps. The muscle bar cusp is preferably not used; and all of the sinus and surrounding tissue is S discarded. The commissural height is maintained at all cost.
- the tissue cover 233 (that is, the cusps sewn to the fabric) is fitted and sewn to the valve frame 232 .
- the valve frame 232 has three cannulated commissural posts 240 a, 240 b, and 240 c mounted thereon, and the tissue cover 233 is sewn to the commissural posts 240 a, 240 b, and 240 c to complete the tri-leaflet valve 230 ( FIG. 3C ).
- the tri-leaflet valve 230 is mounted on commissural pins 240 aa , 240 bb , and 240 cc provided on a valve cage stent 220 of the type disclosed in provisional application No. 60/735,221, Attorney Docket P70721US0, which is incorporated herein by reference in its entirety.
- the commissural posts 240 a, 240 b, and 240 c of the valve frame 232 are cannulated to receive the commissural pins 240 aa , 240 bb , and 240 cc , respectively, of the valve cage stent 220 , thereby connecting the valve frame 232 (and thus the valve 230 ) to the valve cage stent 220 .
- the heart valve prosthesis 210 incorporating the tri-leaflet valve 230 is delivered using a catheter.
- the valve cage stent 220 for use with the tri-leaflet valve 230 has three different zones 221 , 222 , and 223 along its longitudinal axis, the different zones having different geometric configurations so as to perform different functions.
- the first, or center, zone 221 functions as the stent connector, which is identical to the stent disclosed in Int'al Patent Application No. PCT/US2006/043526, filed Nov. 9, 2006 (which is based on U.S. Provisional Application No. 60/735,221), and which connects to the native valve annulus.
- the second and third zones 222 and 223 at either end of the center zone 221 , function respectively as the superior valve rim carrying the commissural pins in the tri-leaflet valve prosthesis 210 or the valve mount in the bi-leaflet valve prosthesis 110 , and the inferior valve skirt.
- the valve skirt 223 provides additional support, as well as a fabric/tissue attachment area to minimize leaking.
- the present invention also encompasses a system and method for implanting the above-described percutaneous valve prostheses 10 in the body.
- the system comprises a valve cage stent 20 for implantation in the body by the use of a first catheter of a delivery system 500 (shown in FIGS. 8A and 8B , and as described in greater detail hereinafter) to provide a stable, fixed, and sturdy frame within which an elastic, compressible valve 30 can be inserted and secured by a second catheter (not shown), and the valve 30 is attached to the valve cage stent 20 after they are discharged from their respective catheters.
- a delivery system 500 shown in FIGS. 8A and 8B , and as described in greater detail hereinafter
- the system comprises a valve cage stent 20 and an elastic, compressible valve 30 which are inserted using the same catheter, and the valve 30 is attached to the valve cage stent 20 within the catheter, as shown in FIGS. 9A-9T .
- the valve cage stent 20 is a self-expanding or balloon expandable cylindrical valve cage stent 20 , made from memory metal, or stainless steel respectively.
- the self-expanding valve cage stent and the balloon expandable valve cage stent are structurally the same (that is, they differ only in the material from which they are made).
- the valve cage stent 20 is fabricated from metal tubing (memory metal or stainless steel), so that it is cylindrical in shape, with the stent pattern being cut into the tubing by laser.
- valve cage stent 20 produces maximal foreshortening of the ovals in the mid portion of the stent and thus provides active fixation of the stent to the annulus of the valve being replaced.
- the valve cage stent 20 has a fabric covering on its interior and parts of its exterior surfaces so in its expanded state it forms a complete seal and does not allow any leakage of blood.
- valve cage stent 20 is mounted on a balloon 600 ( FIG. 8 ), or in a restraining sheath if self-expandable.
- the delivery system apparatus 500 is shown in FIGS. 7A-7C .
- the delivery system apparatus 500 comprises a flexible outer sheath 510 , in which the valve cage stent 20 is inserted with a first set of guide wires 520 attached thereto, followed by a slotted nosecone 530 having another set of guide wires 540 attached thereto.
- the valve cage stent 20 has provisions for the attachment of the prosthetic valve, depending on the type of prosthetic valve contemplated to be used.
- the valve is attached to the valve cage stent 120 via a valve mount affixed to the valve cage stent 120 , as shown in FIGS. 4D-4G and 5 G- 5 I.
- valve is attached to the valve cage stent 220 via engagement of the valve commissural posts 240 a, 240 b, and 240 c with the commissural pins 240 aa , 240 bb , and 240 cc of the valve cage stent 220 , as shown in FIGS. 6H-6J .
- the delivery system employs a two stage procedure, both stages of which can be performed at the same session, only minutes apart.
- the first stage is insertion of the valve cage stent 20 .
- the valve cage stent 120 has a valve mount connected thereto and a guide wire connected to the valve mount.
- the valve cage stent 220 has three commissural pins 240 aa , 240 bb , and 240 cc provided thereon and guide wires connected thereto.
- the second stage is insertion of the elastic and compressible valve, which is restrained in another catheter (not shown) for delivery into the valve cage stent 20 .
- the valve is placed over the guide wire (in the case of a bi-leaflet valve) or guide wires (in the case of the tri-leaflet valve) connected to the valve cage stent 20 in order to ensure proper positioning of the valve relative to the stent.
- the guide wire or wires are withdrawn ( FIGS. 4D-4G , 5 G- 5 I, and 6 I- 6 J).
- valve mount has a snap-on or screw-in mechanism for attachment of the “t”-shaped hinge 135 thereto, as well as the above-described guide wire attached to it for placement of the valve.
- the use of a valve cage 20 allows for fabrication of a tri-leaflet tissue valve.
- valve 30 to the valve cage stent 20 provides the best effective flow dynamics, the flexibility of the whole system 500 is greatly increased, and the profile of the whole system 500 is reduced so that it can be inserted through a small opening in the access vessel.
Abstract
Description
- The present patent application is based on, and claims priority from, U.S. provisional Application No. 60/833,791, filed Jul. 28, 2006, which is incorporated herein by reference in its entirety.
- 1. Field of the Invention
- The present invention relates to heart valve prostheses, preferably to aortic valve prostheses. More specifically, the invention relates to heart valve prostheses that can be implanted percutaneously by means of a catheter from a remote Location without opening the chest cavity.
- 2. Related Art
- Heart valve surgery is used to repair or replace diseased heart valves. Valve surgery is an open-heart procedure conducted under general anesthesia. An incision is made through the patient's sternum (sternotomy), and the patient's heart is stopped while blood flow is rerouted through a heart-lung bypass machine.
- Valve replacement may be indicated when there is a narrowing of the native heart valve, commonly referred to as stenosis, or when the native valve leaks or regurgitates. When replacing the valve, the native valve is excised and replaced with either a biologic or a mechanical valve. Mechanical valves require lifelong anticoagulant medication to prevent clot formation around the valve, which can lead to thromboembolic complications and catastrophic valve failure. Biologic tissue valves typically do not require such medication. Tissue valves can be obtained from cadavers (homografts) or can be from pigs (porcine valve) and cows (bovine pericardial valves). Recently equine pericardium has also been used for making valves. These valves are designed to be attached to the patient using a standard surgical technique.
- Valve replacement surgery is a highly invasive operation with significant concomitant risk. Risks include bleeding, infection, stroke, heart attack, arrhythmia, renal failure, and adverse reactions to the anesthesia medications, as well as sudden death. Two to five percent of patients die during surgery.
- Post-surgery, patients temporarily may be confused due to emboli and other factors associated with the heart-lung machine. The first two to three days following surgery are spent in an intensive care unit where heart functions can be closely monitored. The average hospital stay is between one and two weeks, with several more weeks to months required for complete recovery.
- In recent years, advancements in minimally invasive, endoaortic, surgery interventional cardiology, and intervention radiology have encouraged some investigators to pursue percutaneous replacement of the aortic heart valve. Percutaneous Valve Technologies (“PVT”) of Fort Lee, N. J., has developed a balloon-expandable stent integrated with a bioprosthetic valve, which is the subject of U.S. Pat. Nos. 5,411,552, 5,840,081, 6,168,614, and 6,582,462 to Anderson et al. The stent/valve device is deployed across the native diseased valve to permanently hold the valve open, thereby alleviating a need to excise the native valve and to position the bioprosthetic valve in place of the native valve. PVT's device is designed for delivery in a cardiac catheterization laboratory under local anesthesia using fluoroscopic guidance, thereby avoiding general anesthesia and open-heart surgery. The device was first implanted in a patient in April of 2002.
- PVT's device suffers from several drawbacks. Deployment of PVT's stent has several drawbacks, including that there is very little control over its deployment. This lack of control can endanger the coronary ostea above the aortic valve and the anterior leaflet of the mitral valve below the aortic valve.
- Another drawback of the PVT device is its relatively large cross-sectional delivery profile. This is largely due to fabricating the tri-leaflet pericardial valve inside a robust stainless steel stent. Considering they have to be durable, the materials for the valve and the stent are very bulky, thus increasing the profile of the device. The PVT system's stent/valve combination is mounted onto a delivery balloon, making retrograde delivery through the aorta challenging. An antegrade transseptal approach may therefore be needed, requiring puncture of the septum and routing through the mitral valve, which significantly increases complexity and risk of the procedure. Very few cardiologists are currently trained in performing a transseptal puncture, which is a challenging procedure by itself.
- Another drawback of the PVT device is its lack of fixation provision. It in effect uses its radial force to hold the stent in the desired position. For this to work, sufficient dilatation of the valve area has to be achieved; but this amount of dilation can cause damage to the annulus. Also, due to its inability to have an active fixation mechanism, the PVT device cannot be used to treat aortic regurgitation.
- Another drawback to this system is that it does not address the leakage of blood around the implant, after its implantation.
- Other prior art replacement heart valves use self-expanding stents that incorporate a valve. One such device is that disclosed in U.S. Pat. No. 7,018,406 to Seguin et al. and assigned to and made by CoreValve SA. In the endovascular aortic valve replacement procedure, accurate placement of aortic valves relative to coronary ostia and the mitral valve is critical. Standard self-expanding systems have very poor accuracy in deployment, however. Often the proximal end of the stent is not released from the delivery system until accurate placement is verified by fluoroscopy and the stent typically jumps once released. It is therefore often impossible to know where the ends of the stent will be with respect to the native valve, the coronary ostia, and the mitral valve. The anchoring mechanism is not actively provided (that is, there is no method of fixation other than the use of radial force and barbs that project into the surrounding tissue and not used as positioning marker (that is, markers seen under fluoroscopy to determine the position of the device).
- A simple barb as used in the CoreValve device relies mainly on friction for holding the position.
- Another drawback of prior art self-expanding replacement heart valve systems is their lack of radial strength. In order for self-expanding systems to be easily delivered through a delivery sheath, the metal needs to flex and bend inside the delivery catheter without being plastically deformed. In arterial stents, this is not a challenge, and there are many commercial arterial stent systems that apply adequate radial force against the vessel wall and yet can collapse to a small enough of a diameter to fit inside a delivery catheter without plastically deforming. However, when the stent has a valve fastened inside it, as is the case in aortic valve replacement, the anchoring of the stent to vessel walls is significantly challenged during diastole. The force required to hold back arterial pressure and prevent blood from going back inside the ventricle during diastole will be directly transferred to the stent/vessel wall interface. Therefore the amount of radial force required to keep the self expanding stent/valve in contact with the vessel wall and prevent it from sliding will be much higher than in stents that do not have valves inside of them. Moreover, a self-expanding stent without sufficient radial force will end up dilating and contracting with each heartbeat, thereby distorting the valve, affecting its function and resulting in dynamic repositioning of the stent during delivery. Stent foreshortening or migration during expansion may lead to improper alignment.
- Additionally, the stent disclosed in U.S. Pat. No. 6,425,916 to Garrison simply crushes the native valve leaflets against the heart wall and does not engage the leaflets in a manner that would provide positive registration of the device relative to the native position of the valve. This increases an immediate risk of blocking the coronary ostia, as well as a longer-term risk of migration of the device post-implantation. Further still, the stent comprises openings or gaps in which the replacement valve is seated post-delivery. Tissue may protrude through these gaps, thereby increasing a risk of improper seating of the valve within the stent.
- In view of drawbacks associated with previously known techniques for endovascularly replacing a heart valve, it would be desirable to provide methods and apparatus that overcome those drawbacks.
- Sadra et al. (U.S. published application No. 20050137701) describes a mechanism for anchoring a heart valve, the anchoring mechanism having an actuation system operated remotely. This mechanism addresses the fixation issue; however, considering the irregular shape of the aortic annulus there is a real potential for deforming the prosthetic valve annulus; this may require additional balloon angioplasty to give it its final shape, and also make the new valve more prone to fatigue and fracture. Moreover if full expansion of the stent is prone to deformation, the leaflet coaptation of the valve will be jeopardized.
- Sadra et al (U.S. published application No. 20050137691) describes a system with two pieces, a valve piece and an anchor piece. The valve piece connects to the anchor piece in such a fashion that it will reduce the effective valve area considerably. Valve area, i.e., the inner diameter of the channel after the valve leaflets open, is of prime importance when considering an aortic valve replacement in a stenotic valve. Garrison's valve is also implanted in the inner portion of the stent, compromising the effective valve outflow area. Sadra et al's and Garrison's valves overlook this very critically important requirement.
- The technologies described above and other technologies (for example, those disclosed in U.S. Pat. No. 4,908,028 to Colon et al.; U.S. Published Application No. 2003/0014104, U.S. Published Application No. 2003/0109924, U.S. Published Application No. 2005/0251251, U.S. Published Application No. 2005/0203616, and U.S. Pat. No. 6,908,481 to Cribier; U.S. Pat. No. 5,607,469 to Frey; U.S. Pat. No. 6,723,123 to Kazatchkov et al.; Germany Patent No. DE 3,128,704 A1 to Kuepper; U.S. Pat. No. 3,312,237 to Mon et a).; U.S. Published Application No. 2005/0182483 to Osbourne et al.; U.S. Pat. No. 1,306,391 to Romanoff; U.S. Published Application No. 2005/0203618 to Sharkcawy et al.; U.S. Published Application No. 2006/0052802 to Sterman et al.; U.S. Pat. No. 5,713,952; and U.S. Pat. No. 5,876,437 to Vanney et al.) also use various biological, or other synthetic materials for fabrication of the prosthetic valve. The duration of function and physical deterioration of these new valves have not been addressed. Their changeability has not been addressed, in the percutaneous situation.
- It is to the solution of these and other problems that the present invention is directed.
- It is accordingly a primary object of the present invention to provide to methods and apparatus for endovascularly replacing a heart valve.
- In is another object of the present invention to provide methods and apparatus for endovascularly replacing a heart valve with a replacement valve prosthesis using a balloon expandable and/or self expanding valve cage stent upon which a bi-leaflet or tri-leaflet elastic valve is inserted.
- It is also a feature of this invention that the valve piece of the implant is removable, and thus exchangeable, in the event of long or medium term failure of the implanted valve.
- It is another object of this invention to provide maximal valve area to the out flow tract of the left ventricle, thus minimizing the gradient across the valve, by using a supra annular implant of the valve piece to the valve cage stent.
- These and other objects are achieved by a heart valve prosthesis comprising a cylindrical valve cage stent constructed to be implanted percutaneously in the planar axis of a native valve annulus, the valve cage stent having a superior rim; and an elastic and compressible, multi-leaflet valve insertable percutaneously into the body, the valve including a valve frame made from a memory metal and a tissue cover attached to the valve frame; and attachment means for attaching the valve to the superior rim of the valve cage.
- The valve can be a bi-leaflet or a tri-leaflet valve. The bi-leaflet valve includes a frame, a tissue cover, a deformable hinge, and means for detachably connecting the valve to the valve cage stent. The frame has two substantially semicircular, expandable, and compressible parts, and the tissue cover is configured to cover the two parts of the frame with the straight sides of the two parts in spaced-apart relation. The tissue cover has a central aperture and the two parts of the frame have respective slots. The deformable hinge has oppositely extending arms extending through the slots and a stem received through the aperture. The superior rim of the valve cage stent has a valve mount affixed thereto for receiving a mating part on the hinge, thereby defining the attachment means.
- The tri-leaflet valve includes a frame, a tissue cover, and means for detachably connecting the valve to the valve cage stent. The frame is cylindrical and has three commissural posts mounted thereon. The tissue cover has three cusps fitted and sewn to the valve frame, the commissural posts being sized to maintain the commissural height of the cusps. The valve cage stent has three commissural pins extending from the superior rim thereof, and the commissural posts of the frame are cannulated to receive the commissural pins of the valve cage stent, thereby defining the attachment means.
- Other objects, features and advantages of the present invention will be apparent to those skilled in the art upon a reading of this specification including the accompanying drawings.
- The invention is better understood by reading the following Detailed Description of the Preferred Embodiments with reference to the accompanying drawing figures, in which like reference numerals refer to like elements throughout, and in which:
-
FIG. 1 is a diagram of a valve prosthesis in accordance with the present invention. -
FIG. 2A is a diagrammatic plan view of a frame for a bi-leaflet percutaneous heart valve in accordance with the present invention. -
FIG. 2B is a diagrammatic plan view of a tissue cover for the frame ofFIG. 2A . -
FIG. 2C is a diagrammatic plan view of an assembled bi-leaflet percutaneous heart valve in accordance with the present invention, incorporating the frame ofFIG. 2A and the tissue cover ofFIG. 2B . -
FIG. 2D is a diagrammatic side elevational view of the bi-leaflet percutaneous heart valve ofFIG. 2C in the open position. -
FIG. 2E is a diagrammatic side elevational view of the bi-leaflet percutaneous heart valve ofFIG. 2C in the closed position. -
FIG. 2F is a top perspective view of an assembled bi-leaflet percutaneous heart valve in accordance with the present invention, in the closed position. -
FIGS. 2G and 2H are top and side perspective views of the bi-leaflet percutaneous heart valve ofFIG. 2F in the open position. -
FIGS. 2I and 2J are side perspective views of the valve cage stent for use with the bi-leaflet percutaneous heart valve ofFIG. 2F . -
FIG. 2K is a partial perspective view of the bi-leaflet percutaneous heart valve ofFIG. 2F mounted on the valve cage stent ofFIG. 2I , with the valve in the closed position. -
FIG. 2L is a partial perspective view of the bi-leaflet percutaneous heart valve ofFIG. 2F mounted on he valve cage stent ofFIG. 2I , with the valve in the open position. -
FIG. 3A is a diagrammatic perspective view of a frame for a tri-leaflet percutaneous heart valve in accordance with the present invention. -
FIG. 3B is a perspective view of a tissue cover for the frame ofFIG. 3A . -
FIG. 3C is a perspective view of an assembled tri-leaflet percutaneous heart valve in accordance with the present invention, incorporating the frame ofFIG. 3A and the tissue cover ofFIG. 3B -
FIG. 3D is a side perspective view of the valve cage stent for use with the tri-leaflet percutaneous heart valve ofFIG. 3C . -
FIGS. 3E and 3F are top perspective views of the valve cage stent for use with the tri-leaflet percutaneous heart valve ofFIG. 3C . -
FIG. 3G is a diagrammatic view of a portion the valve cage stent for use with the tri-leaflet percutaneous heart valve ofFIG. 3C , which as been opened up and flattened for purposes of illustration. -
FIG. 3H is a partially cut-away perspective view of the tri-leaflet percutaneous heart valve ofFIG. 3C mounted on the valve cage stent ofFIG. 3D , in the undeployed condition. -
FIG. 3I is a partially cut-away perspective view of the tri-leaflet percutaneous heart valve ofFIG. 3C mounted on the valve cage stent ofFIG. 3D , in the deployed condition. -
FIGS. 4A-4G show the sequence of steps in implantation of the bi-leaflet percutaneous heart valve prosthesis ofFIG. 2C in an aorta, in which the valve is attached to the valve cage stent outside the delivery catheter. -
FIGS. 5A-5I are diagrammatic representations of the sequence of steps in implantation of the bi-leaflet percutaneous heart valve ofFIG. 2C , the aorta being omitted from all ofFIGS. 5A-5I and the valve cage being omitted fromFIGS. 5A-5F for clarity. -
FIGS. 6A-6J show the sequence of steps in implantation of the tri-leaflet percutaneous heart valve ofFIG. 3C in an aorta, in which the valve is attached to the valve cage stent outside the delivery catheter. -
FIGS. 7A and 7B are exploded and assembled views, respectively, of the delivery system apparatus used in implantation of the bi-leaflet and tri-leaflet valves in accordance with the present invention. -
FIG. 7C is an end view of the flexible sheath of the delivery system apparatus ofFIGS. 7A and 7B . -
FIG. 8 is a side view of a valve cage stent mounted on a balloon catheter. -
FIGS. 9A-9T show the sequence of steps in implantation of the tri-leaflet percutaneous heart valve ofFIG. 3C in an aorta, in which the valve is attached to the valve cage stent within the delivery catheter. - In describing preferred embodiments of the present invention illustrated in the drawings, specific terminology is employed for the sake of clarity. However, the invention is not intended to be limited to the specific terminology so selected, and it is to be understood that each specific element includes all technical equivalents that operate in a similar manner to accomplish a similar purpose.
- The present invention relates to heart valve prostheses that can be implanted percutaneously by means of a catheter from a remote location without opening the chest cavity. As shown in
FIG. 1 , thevalve prosthesis 10 comprises two parts, (1) avalve cage stent 20 constructed to be implanted in the planar axis of the native valve annulus, (2) an elastic andcompressible valve 30, and (3) an attachment mechanism for attaching thevalve 30 to the superior rim of the above mentionedvalve cage stent 20. In accordance with the present invention, two types 110 and 210 ofheart valve prosthesis 10 are contemplated, one type 110 incorporating an elastic and compressible bi-leaflet hinged valve 130 (shown inFIGS. 2A-2E ) and the other type 210 incorporating an elastic and compressible tri-leaflet biologic valve 230 (shown inFIGS. 3A-3C ). A system and method for implanting the valves (shown inFIGS. 4A-4G , 5A-5I, and 6A-6J) is also encompassed by the invention. - Referring now to
FIGS. 2A-2H , thebi-leaflet tissue valve 130 comprises a two-part (that is, a two-leaflet)frame 132 made from a memory metal wire or strip and atissue cover 133. As best shown inFIG. 2A , eachpart frame 132 is substantially semicircular. Portions of eachpart FIGS. 2A and 2C ) so that eachpart frame 132, as well as theframe 132 as a whole, is expandable and compressible, while the remaining portions of theframe 132 are not expandable and compressible. - Each
part frame 132 includes aslot 134 for receiving ahinge 135 having a shape when deployed that is similar to a lower-case “t”, as shown inFIGS. 2D and 2E , having twoaims stem 135 c. Theslot 134 is formed unitarily with theframe 132. The “t”-shapedhinge 135 is stamped out of memory metal (for example, nitinol) sheeting so that it is deformable. Thearms hinge 135 haveprojections 135 d at their ends, which function as stops for the leaflets. Thestem 135 c of thehinge 135 has a snap-on or screw-inmechanism 141 for attachment to a valve mount 142 (shown inFIGS. 2I-2L ), as described below. - The tissue cover 133 (shown in
FIG. 2B ) is made, for example, of equine or bovine pericardium, or various synthetic materials, for example, or medical grade silicone, fabric, or other compressible, materials, and is configured to cover the twoparts frame 132 with their straight sides in spaced apart relation, with acentral aperture 133 a in the center for receiving the stem of the “t”-shapedhinge 135 and twoside apertures 133 b in alignment with theslots 134 for receiving thearms hinge 135. Thetissue cover 133 is sewn to eachpart frame 132, as shown in FIGS. 2C and 2F-2H, and thus connects the twoparts frame 132 in spaced-apart relation. - As discussed in greater detail below, in use, the
bi-leaflet valve 130 is detachably connected to a valve mount 142 (shown inFIGS. 2I and 21 ) via the “t”-shapedhinge 135, as shown inFIGS. 2K-2N , 4D-4G, and 5G-5I. Thevalve mount 142 is also made from a memory metal so that it is collapsible. More specifically, thevalve mount 142 hasarms receptacle 142 c, which are folded up vertically when thevalve cage stent 120 is in its compressed (undeployed) condition, the ends of thearms valve cage stent 120. - The detachable and collapsible bi-leaflet construction of the
valve 130 enables thevalve 130 in conjunction with its entire delivery system to be sized down so that it can be inserted percutaneously using a catheter, as described below. - Referring now to
FIGS. 3A-3C , thetri-leaflet tissue valve 230 comprises an expandable and compressible valve frame 232 (shown inFIG. 3A ) made from a memory metal wire or strip and a tissue cover 233 (shown inFIG. 3B and 3C ). Thetissue cover 233 is made from the individual cusps of a porcine aortic valve sewn to appropriate fabric. Three identical cusps are selected. Two or more pigs are used to get ideal sized aortic cusps. The muscle bar cusp is preferably not used; and all of the sinus and surrounding tissue is S discarded. The commissural height is maintained at all cost. The tissue cover 233 (that is, the cusps sewn to the fabric) is fitted and sewn to thevalve frame 232. Thevalve frame 232 has three cannulatedcommissural posts tissue cover 233 is sewn to thecommissural posts FIG. 3C ). - As shown in
FIGS. 3A-3C , thetri-leaflet valve 230 is mounted on commissural pins 240 aa, 240 bb, and 240 cc provided on avalve cage stent 220 of the type disclosed in provisional application No. 60/735,221, Attorney Docket P70721US0, which is incorporated herein by reference in its entirety. More specifically, thecommissural posts valve frame 232 are cannulated to receive the commissural pins 240 aa, 240 bb, and 240 cc, respectively, of thevalve cage stent 220, thereby connecting the valve frame 232 (and thus the valve 230) to thevalve cage stent 220. As described below, the heart valve prosthesis 210 incorporating thetri-leaflet valve 230 is delivered using a catheter. - As shown in
FIG. 3G , thevalve cage stent 220 for use with thetri-leaflet valve 230 has threedifferent zones third zones valve skirt 223 provides additional support, as well as a fabric/tissue attachment area to minimize leaking. - The present invention also encompasses a system and method for implanting the above-described
percutaneous valve prostheses 10 in the body. In a first embodiment, the system comprises avalve cage stent 20 for implantation in the body by the use of a first catheter of a delivery system 500 (shown inFIGS. 8A and 8B , and as described in greater detail hereinafter) to provide a stable, fixed, and sturdy frame within which an elastic,compressible valve 30 can be inserted and secured by a second catheter (not shown), and thevalve 30 is attached to thevalve cage stent 20 after they are discharged from their respective catheters. Performing the procedure in two parts at the same session downsizes the devices considerably, so that the procedure can be performed percutaneously. In a second embodiment, the system comprises avalve cage stent 20 and an elastic,compressible valve 30 which are inserted using the same catheter, and thevalve 30 is attached to thevalve cage stent 20 within the catheter, as shown inFIGS. 9A-9T . - The
valve cage stent 20 is a self-expanding or balloon expandable cylindricalvalve cage stent 20, made from memory metal, or stainless steel respectively. The self-expanding valve cage stent and the balloon expandable valve cage stent are structurally the same (that is, they differ only in the material from which they are made). Thevalve cage stent 20 is fabricated from metal tubing (memory metal or stainless steel), so that it is cylindrical in shape, with the stent pattern being cut into the tubing by laser. - The expansion of the
valve cage stent 20 produces maximal foreshortening of the ovals in the mid portion of the stent and thus provides active fixation of the stent to the annulus of the valve being replaced. Thevalve cage stent 20 has a fabric covering on its interior and parts of its exterior surfaces so in its expanded state it forms a complete seal and does not allow any leakage of blood. - For delivery, the
valve cage stent 20 is mounted on a balloon 600 (FIG. 8 ), or in a restraining sheath if self-expandable. Thedelivery system apparatus 500 is shown inFIGS. 7A-7C . Thedelivery system apparatus 500 comprises a flexibleouter sheath 510, in which thevalve cage stent 20 is inserted with a first set ofguide wires 520 attached thereto, followed by a slottednosecone 530 having another set ofguide wires 540 attached thereto. - The
valve cage stent 20 has provisions for the attachment of the prosthetic valve, depending on the type of prosthetic valve contemplated to be used. For example, in the case of a bi-leaflet valve, the valve is attached to thevalve cage stent 120 via a valve mount affixed to thevalve cage stent 120, as shown inFIGS. 4D-4G and 5G-5I. In the case of a tri-leaflet valve, the valve is attached to thevalve cage stent 220 via engagement of the valvecommissural posts valve cage stent 220, as shown inFIGS. 6H-6J . - The delivery system employs a two stage procedure, both stages of which can be performed at the same session, only minutes apart. The first stage is insertion of the
valve cage stent 20. In the case of a bi-leaflet valve, as shown inFIG. 4A , thevalve cage stent 120 has a valve mount connected thereto and a guide wire connected to the valve mount. In the case of a tri-leaflet valve, as shown inFIGS. 6A-6G and as described above, thevalve cage stent 220 has three commissural pins 240 aa, 240 bb, and 240 cc provided thereon and guide wires connected thereto. - The second stage is insertion of the elastic and compressible valve, which is restrained in another catheter (not shown) for delivery into the
valve cage stent 20. As shown inFIGS. 4A-4D , 5A-5F, and 6A-6H, in the second stage, the valve is placed over the guide wire (in the case of a bi-leaflet valve) or guide wires (in the case of the tri-leaflet valve) connected to thevalve cage stent 20 in order to ensure proper positioning of the valve relative to the stent. Once the valve is seated, the guide wire or wires are withdrawn (FIGS. 4D-4G , 5G-5I, and 6I-6J). - Because the bi-leaflet valve is detachable from the valve mount, it can be replaced when necessary. The valve mount has a snap-on or screw-in mechanism for attachment of the “t”-shaped
hinge 135 thereto, as well as the above-described guide wire attached to it for placement of the valve. The use of avalve cage 20 allows for fabrication of a tri-leaflet tissue valve. - In addition, the connection of
valve 30 to thevalve cage stent 20 provides the best effective flow dynamics, the flexibility of thewhole system 500 is greatly increased, and the profile of thewhole system 500 is reduced so that it can be inserted through a small opening in the access vessel. - Modifications and variations of the above-described embodiments of the present invention are possible, as appreciated by those skilled in the art in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims and their equivalents, the invention may be practiced otherwise than as specifically described.
Claims (13)
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PCT/US2007/016855 WO2008013915A2 (en) | 2006-07-28 | 2007-07-27 | Percutaneous valve prosthesis and system and method for implanting same |
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US16/503,179 Active 2027-08-22 US11141265B2 (en) | 2006-07-28 | 2019-07-03 | Percutaneous valve prosthesis and system and method for implanting the same |
US17/494,770 Pending US20220023039A1 (en) | 2006-07-28 | 2021-10-05 | Two-part bi-leaflet heart valve prostheses |
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US17/494,770 Pending US20220023039A1 (en) | 2006-07-28 | 2021-10-05 | Two-part bi-leaflet heart valve prostheses |
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Also Published As
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WO2008013915A9 (en) | 2008-08-21 |
US11141265B2 (en) | 2021-10-12 |
US20220023039A1 (en) | 2022-01-27 |
WO2008013915A2 (en) | 2008-01-31 |
US20160331532A1 (en) | 2016-11-17 |
US10350065B2 (en) | 2019-07-16 |
WO2008013915A3 (en) | 2008-07-03 |
US20190321174A1 (en) | 2019-10-24 |
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