US20120283824A1 - Heart Valve Stent - Google Patents

Heart Valve Stent Download PDF

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US20120283824A1
US20120283824A1 US13464367 US201213464367A US20120283824A1 US 20120283824 A1 US20120283824 A1 US 20120283824A1 US 13464367 US13464367 US 13464367 US 201213464367 A US201213464367 A US 201213464367A US 20120283824 A1 US20120283824 A1 US 20120283824A1
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valve
stent
heart
mitral
anchoring
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US13464367
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Georg Lutter
Lucian Lozonschi
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Georg Lutter
Lucian Lozonschi
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/24Heart 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
    • A61F2/2412Heart 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 with soft flexible valve members, e.g. tissue valves shaped like natural valves
    • A61F2/2418Scaffolds therefor, e.g. support stents
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/04Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
    • A61B17/0401Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/24Heart 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
    • A61F2/2442Annuloplasty rings or inserts for correcting the valve shape; Implants for improving the function of a native heart valve
    • A61F2/2445Annuloplasty rings in direct contact with the valve annulus
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/24Heart 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
    • A61F2/2442Annuloplasty rings or inserts for correcting the valve shape; Implants for improving the function of a native heart valve
    • A61F2/2454Means for preventing inversion of the valve leaflets, e.g. chordae tendineae prostheses
    • A61F2/2457Chordae tendineae prostheses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/24Heart 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
    • A61F2/2478Passive devices for improving the function of the heart muscle, i.e. devices for reshaping the external surface of the heart, e.g. bags, strips or bands
    • A61F2/2487Devices within the heart chamber, e.g. splints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00238Type of minimally invasive operation
    • A61B2017/00243Type of minimally invasive operation cardiac
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/04Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
    • A61B2017/0496Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials for tensioning sutures
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/24Heart 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
    • A61F2/2427Devices for manipulating or deploying heart valves during implantation
    • A61F2/2436Deployment by retracting a sheath
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0008Fixation appliances for connecting prostheses to the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0008Rounded shapes, e.g. with rounded corners elliptical or oval
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0013Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028Shapes in the form of latin or greek characters
    • A61F2230/005Rosette-shaped, e.g. star-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028Shapes in the form of latin or greek characters
    • A61F2230/0054V-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0067Three-dimensional shapes conical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0069Three-dimensional shapes cylindrical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0073Quadric-shaped
    • A61F2230/0078Quadric-shaped hyperboloidal
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0004Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/001Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting a diameter

Abstract

A heart valve stent having a section equipped to receive a heart valve implant and several proximally disposed anchoring elements, characterized by several anchoring threads, which with the one end thereof are fastened to the stent, and also with a brace fastening the anchoring threads with the other end thereof to the distal chamber wall to provide tension between the heart chamber wall and the proximally anchored anchoring elements.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • [0001]
    This application represents a continuation of U.S. application Ser. No. 12/677,958, filed Sep. 9, 2010, pending, a National Stage application of PCT/DE2008/001515 entitled “Heart Valve Stent”, filed Sep. 10, 2008.
  • BACKGROUND OF THE INVENTION
  • [0002]
    The invention refers to a valve stent with a section equipped to receive a heart valve implant and several of proximally disposed anchoring elements.
  • [0003]
    Such heart valve stents are known in various forms for the replacement dysplastic and degenerated heart valves. Thereby, the surgical implantation of heart valve prostheses is regularly accomplished in the cardioplegic heart. The old, functionally degenerated heart valve is resected and the new, implantable heart valve is sewed in.
  • [0004]
    However, when the mitral valve is affected, one tries, as far as possible, to maintain the old valve in spite of its malfunctioning so that the entire dynamic mital valve apparatus is not disturbed. The reason for this is that, for instance, the chordae tendineae which are attached to the mitral valve are very important for ventricular function. Therefore, they should preferably not be removed from the old mitral valve.
  • [0005]
    Ideally, the mitral valve (in case the old valve cannot be reconstructed) will be pushed aside as far as possible to make room for a new valve. Space does not play such an important roll as compared to the aortic annulus which can be more easily stenosed (i.e. during displacement of the old aortic valve for sole percutaneous implantation).
  • [0006]
    The chordae tendineae of the mitral valve shall be, if possible, structurally maintained to preserve the ventricular geometry and hence of the left ventricle or achieve optimal function of the left chamber as far as possible. Therefore, a best possible function of the left chamber is obtained and achieved. Of significant relevance is that the anterior mitral valve leaflet is not pushed aside into the free space toward the left ventricle, but rather that it is attached to the mitral annulus so that a press forward of the anterior leaflet into the left ventricular outflow tract (LVOT) is avoided (“sam” phenomenon: systolic anterior movement). This is extremely important, because otherwise a left heart decompensation (massive dysfunction of the left ventricle) could rapidly occur.
  • [0007]
    Surgically the old mitral valve is attached to the old annulus so that there is a free flow of blood through the valve and both adjacent heart chambers. After pushing aside (attachment of the valve onto the annulus) the heart valve prosthesis is surgically implanted into the annulus.
  • [0008]
    This extensive method mandatorily takes place with the help of a heart- and lung-machine. For high risk patients it is usually not used and minimally invasive and percutaneous methods to perform the implantation of a heart valve are sought.
  • [0009]
    In this context, the German patent DE 195 46 692 C2 and the corresponding EP 1469 797 B1 is known. This patent describes a self-expanding heart valve prosthesis for the implantation into a human body using a catheter system with a heart valve and a foldable, valve-connected and expanding stent. Such a self-expanding heart valve prosthesis can be directed through the femoral artery with the help of a catheter based system to the area of cardiac implantation. After the stent reaches the area of implantation, it can be successively defolded. Along its long axis, the stent is composed of several, at angles to each other, self-expanding segments that are defolded gradually. After expansion, the heart valve prosthesis can be anchored with the support of hooks at least in the respective blood vessel close to the heart.
  • [0010]
    Another apparatus for the fixation and anchorage of heart valve prostheses is described in the German Patent 100 10 074 A1 which fundamentally consists of wire-like elements attached together. Different brackets are hereby used to secure anchorage and brace a heart valve.
  • [0011]
    Even with the known solutions there is still the danger that a heart valve is mal-implanted due to wrong positioning and deficient angular adjustment of the heart valve prostheses. Improved positioning and angular alignment for the aortic valve can be reached by the stent described in the European Patent EP 1 469 797 B1 which consists of supportive holders which can be inserted into the aortic pouches and create a defined distance to the aortic valve. Beyond this, the possibility exists to halt a failed implantation of a heart valve prosthesis and to push the valved stent (“a valve integrated into a stent”) back into the catheter delivery system (more precisely the “cartridge”). Thereby, it is possible that the stent can again slide out when good positioning for the valved stent has been reached. Thus, the valved stent can be taken in and out until the optimal positioning has been achieved (“sliding technique”).
  • [0012]
    A much larger problem for the optimal positioning of the new heart valve in the stent (alternatively valved stent) still exists in the following: in most cases the old, native valve will not be eliminated by the above-described technique of implantation.
  • [0013]
    This leads to the fact that the new valve which will be pressed into (partly squashed into) the old, deformed valve will be transformed into the original form. The reason for this is that the location of implantation for the valved stent is affected by the morphology, the shape and consistency of the old native valve (for instance by sclerosis or calcification of the native valve).
  • [0014]
    Therefore, the old annulus of the valve with the corresponding changed valves/pouches determines to what extent and where the native valve will defold and whether its form can develop. Hence, for the optimal function of the valve and maintenance of the atrial and ventricular function not only the anchorage/positioning is important, but also the fitting of the valve stent into the neo-annulus (old valve annulus with old valve shapes it) and with it the pushing back of the old valve.
  • [0015]
    Based on the fact that there are known problems of the valved stents, the challenge of this intervention is to produce a heart valved stent, especially a mitral valved stent, for minimally-invasive transplantation, which preferably facilitates the natural functioning of the heart.
  • SUMMARY OF THE INVENTION
  • [0016]
    The basic idea of the invention is to produce a heart valve stent which establishes the anatomic requirements for the natural exertion of the function—like a healthy heart. In the process, the invention-related heart valve stent with its self-expanding, foldable embodiment establishes a minimally-invasive operation which assures an exact positioning and secure fixation of the valve stent. Thereby, a tension between the mitral valve and ventricle similar to the natural tension of the chordae tendineae is generated, and at the same time it will be provided that the valve parts of the old mitral valve (especially the anterior mitral valve leaflet) will not disturb the flow rate of the blood.
  • [0017]
    Therefore, it is intended that the valve stent, according to the invention, is catheter-inserted into one of the heart chambers or into the adjacent large vessels of the heart, then defolded in one of the heart chambers, whereupon its anchoring elements are fixed in the tissue. Finally, the stent is fixed at its opposed, subvalvular wall of the heart chamber under development of a tension between the wall of the heart chamber and the proximal, supravalvular, fixed anchoring elements with anchoring sutures (hereafter referred to as neo-chordae).
  • [0018]
    The fixation of the anchoring sutures in the distal wall of the heart chamber exhibits a thrust bearing to the proximal anchoring elements which will be established by a joint or another element acting as a thrust bearing. This counter bearing can be preferentially designed also as an adjusting element for the length of the sutures.
  • [0019]
    Advantages of the heart valve stents which according to the intervention are the exact and easy fixation of the heart valve stent and improved contractility of the heart in minimally-invasive operations inn comparison with customary valve stents.
  • [0020]
    Preferentially, the axially, relatively to the longitudinal axis, arranged anchoring sutures are fixed according to the invention (the valve stent) with one end to the annulus of the heart valve implant, so that after development of a tension between the stent and the wall of the ventricle, the positioning and the angular arrangement of the valve can be directly impacted. The anchoring sutures can also be fixed at the distal part of the circumference of the valve stent. The connection between the anchoring sutures and the stent has to be conducted so that a tension which should run fundamentally in an axial direction relative to the long axis of the stent and is formed between the proximal anchoring elements and the distal counter bearing.
  • [0021]
    According to another preferential design of the invention, the anchoring sutures (neo-chordae) have elements to adjust the length of the anchoring sutures so that through the length of the anchoring sutures a certain tension between the heart valve stent and the heart wall can be regulated.
  • [0022]
    Thereby, an adjusting element, for example, for the individual length of sutures or for all sutures together can be allowed for. The adjusting element for the length of sutures is preferably designed small and can, for instance, be constructed in such a manner that this element shortens the suture to the desired length by rolling-up of the excess thread.
  • [0023]
    The construction of the elastic anchoring sutures along the axis are also preferred so that they are able to react to heart contractions without having too sutures that might negatively affect the heart function. Here the suture length should be selected so that the elasticity is not sacrificed due to the tension between the anchoring elements and the heart wall.
  • [0024]
    After adjusting the counter bearing of the adjusting element to the length of sutures, a notably beneficial design is made so that also a re-adjustment of the tension between the anchoring elements and the counter bearing, i.e. a re-tensioning of the anchoring sutures is possible without opening the heart.
  • [0025]
    Especially favoured is the structure of the mitral valve stent which is fundamentally oval or u-shaped in the plane of the mitral valve annulus so that no pressure to the LVOT (left ventricular outflow tract) and/or aortic annulus is exerted. Therewith damage to the hearts function is stopped (Ma L, Tozzi P, Huber C H, Taub S, Gerelle G, von Segesser L K. Double-crowned valved stents for off-pump mitral valve replacement. Eur J Cardiothorac Surg. 2005 August; 28(2); 194-8; discussion 198-9.). Additionally, the subvalvular apparatus also completely retains its natural anatomy and is not compromised (Boudjemline Y, Agnoletti G, Bonnet D, Behr L, Borenstein N, Sidi D, Bonhoeffer P. Steps toward the percutaneous replacement of atrioventricular valves an experimental study. J Am Coll Cardiol. 2005 Jul. 19; 46(2); 360-5).
  • [0026]
    This valve stent has for the natural mitral valve apparatus a completely adapted, exceedingly nestled form so that this conically tapered (cranial-caudal axis) not entirely circular (oval-like in the transversal axis) valve stent is able to attach to and abut to the natural form of the mitral valve. In the area of the anterior mitral valve annulus, the valve stent is flat and exerts almost no pressure on and does not constrict the LVOT. In the area of the posterior mitral valve annulus, it is oval and replicates a form like the posterior annulus. This valve stent forms a thin, restricted along the length (cranial-caudal) structure which in its form aligns completely to the mitral valve and thus in the area of the natural mitral valve annulus looks like a negative impression of it. In fact, the valve stent contacts the old mitral valve and the annulus, but leaves their anatomy completely unchanged.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0027]
    In the following the invention will be closely elucidated by means of the attached figures representing the particularly preferred execution examples. It shows:
  • [0028]
    FIG. 1 a favoured execution example of the valve stent according to the invention in a schematic lateral view;
  • [0029]
    FIG. 2 the demonstrated execution example in FIG. 1 with top view from above;
  • [0030]
    FIG. 3 top view on several especially preferred valve stents according to the invention;
  • [0031]
    FIG. 4 a top view from an execution example from below;
  • [0032]
    FIG. 5 a schematic view which explains the minimally-invasive transplantation of the mitral valve stent according to the invention in a first phase of insertion of the mitral valve stent into the location of transplantation;
  • [0033]
    FIG. 6 a schematic view for the demonstration of the minimally-invasive transplantation of the mitral valve stents according to the invention in a second phase after positioning of the mitral valve;
  • [0034]
    FIG. 7 a schematic view for demonstration of the minimally-invasive transplantation of the mitral valve stent after completion of the fixation of the anchoring sutures outside of the apex of the left ventricular heart wall;
  • [0035]
    FIG. 8 a schematic view of an alternative, intracardial fixation of the anchoring sutures in the area of the papillary muscles;
  • [0036]
    FIG. 9 a schematic view of a heart valve stent which is fixed in the aortic annulus according to the invention;
  • [0037]
    FIG. 10 a schematic view of a heart valve stent which is fixed in the pulmonary position according to the invention;
  • [0038]
    FIG. 11 a schematic view of a heart valve stent which is fixed in the tricuspid position according to the invention;
  • [0039]
    FIG. 12 an especially preferred execution example of the valve stent (according to the invention) in a schematic lateral view without heart valve and anchoring sutures; and
  • [0040]
    FIG. 13 a schematic dorsal, intracardiac view of a heart valve stent which is fixed in the mitral position according to the invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0041]
    FIGS. 1 to 11 indicate the stent according to the invention for the implantation and fixation of heart valve prostheses in different views to show the configuration of the stents and the spatial relations of individual parts of the stent to each other in an unfolded (FIGS. 1-4 and 6-11) and in a folded condition (FIG. 5).
  • [0042]
    FIG. 1 shows a foldable mitral valve stent 10 according to the invention in a perspective lateral view. The stent 10 exhibits mainly three parts: proximally (supravalvularly) on stent 10 there are several serrated, arched anchoring (FIG. 3) elements 20 circularly arranged which are able to anchor supravalvularly (respectively atrially) the valve stent 10 in an implanted condition. The preferable stent body 30 flattened to the LVOT is distally adjoined and is conical and in cross section ovally shaped (compare FIG. 2).
  • [0043]
    The stent body 30 forms a basket- or trapezoid-like figure which nestles to the mitral valve annulus and extends in the direction of the left ventricle. This stent 10 is held in the atrium due to its conically-tapered form and due to the atrial anchoring elements 20. A bi- or tri-leaflet valve 50 can be integrated into the stent body 30.
  • [0044]
    At the distal part of the stent body 30 (to the direction of the left ventricle) there are anchoring sutures 40 which are distally equipped to the stent body 30 for the anchorage of the entire stent 10. These anchoring sutures 40 provide for an anchorage in the opposed wall of the ventricle or for instance in the area of the papillary muscles (proximal, medial or distal part of the papillary muscle): compare FIGS. 7 and 8. With the help of an adjusting element to regulate the length of sutures 70, these anchoring sutures 40 can be positioned and adjusted to the optimal length so that the heart valved stent 10 can be fixed and anchored.
  • [0045]
    FIG. 2 indicates the stent 10 in a top view. Thereby, it can be distinguished that stent 10 forms a neo-annulus, alternatively a stent body 30 in which the heart valve prosthesis 50 can be implanted and in which it can be fixed. Furthermore, it can be recognized that the invention-like stent 10 can be shaped asymmetrically in relation to several supravalvular (atrial) stent brackets 20.
  • [0046]
    This can be identified by the fact that the stent body 30 is oval-like and flattened on one side as seen in this figure, so it (the stent body 30) can be installed with its flattened side towards the direction of the LVOT. This flattening has the consequence that no pressure on this side towards the LVOT and towards the aortic valve can be exerted from the self-expanding stent in case the stent 10 is used, i.e. in the mitral position. Further favoured embodiments of the stent 10 are indicated in FIG. 3 according to the invention.
  • [0047]
    FIG. 4 demonstrates the invention-pertaining stent 10 from a bottom view. From this it is obvious that the diameter, of the atrial part to the ventricular part of the stent body 30 becomes smaller so that this looks like a truncated cone from the lateral view (compare FIG. 1). The anchoring elements 20 as well as the stent body 30 can be upholstered with cloth (i.e. synthetics, pericardium, PTFE or Goretex, etc.) to achieve better sealing between the heart valve prosthesis 50, stent body 30 and the surrounding heart structure. This sealing membrane is tapered/alternatively upholstered between the heart valve prosthesis 50, the stent body 30 or onto the atrial stent struts 20 to achieve optimal sealing of the valve between both heart chambers.
  • [0048]
    In FIGS. 5 to 7 and 8, the retrograde transapical implantation of the valved stent is described. The retrograde transaortic as well as the antegrade transatrial approach can alternatively be performed. The deployment of a valved stent with a folded valved stent above the old mitral annulus is shown in FIG. 5. A slow unfolding (preferred self-expanding) of the atrial anchoring elements 20 can be started after successful orientation with support of labelling at the valve stent 10 (not shown). The positioning in the left atrium should be done in that way that the flattened side of the stent body 30 is turned towards the direction of the LVOT (aortic valve). The stent will be further expanded.
  • [0049]
    FIG. 6 indicates the expanded valve stent 10 in the left-atrio-ventricular in-flow tract. Anchoring sutures 40 are adjusted in or outside the wall of the heart and later—as shown in FIG. 7—they will be fixed with the support of the thrust bearing 80 which is favourably designed as an adjusting element for the length of sutures. During the adjustments for the length of the anchoring sutures 40, visualization of the mitral valve apparatus (i.e. Echo, CT, NMR) is carried out so as to optimally pull the annulus of the new stent 10 toward the ventricular wall, paravalvular leakage no longer exists, the stent 10 can be fixed in a good manner, and the mitral valve annulus and—apparatus support advantageously the left ventricular function.
  • [0050]
    Alternatively to FIG. 7, the anchoring sutures 40 can also be fixed at the papillary muscles (see FIG. 8) so that these sutures 40 represent the neo chordee and takeover the function of the functionless chordae tendineae. The fixation of the anchoring sutures 40 at the wall of the heart in each case result from a thrust bearing 80 which can be developed as a knot or also as an independent element. It is also possible that the ventricular anchoring sutures 40 are not only affixed to the stent body 30, but also at the integrated valve itself. The caudal anchoring sutures 40 can also be fixed at any other point of the ventricle.
  • [0051]
    FIG. 7 shows the accomplished positioning and fixation of the stent 10. After the length and location of the single anchoring sutures 40 has been determined, these anchoring sutures 40 will be fixed with the suture-length adjusting elements 70, for instance, in the left ventricular wall. The suture-length adjusting element 70 is used for the optimal calibration of the length and position of the valve stent 10 and therefore for the valve prosthesis 50. Different sutures 40 can exhibit different length and fixing positions in the ventricle.
  • [0052]
    FIGS. 9 to 11 demonstrate additional examples for the application of the valve stent 10 according to the invention, whereas the stent 10 is readjusted to the particular anatomy (for the aortic- and pulmonary valve position a rather circular form (compare FIG. 3) and for the tricuspid position a rather oval form).
  • [0053]
    FIG. 12 shows an especially preferred designed execution example of the valve stent pertaining to the invention in a schematic lateral view which is shown without heart valve and anchoring sutures for a better clearness.
  • [0054]
    For clarification in FIG. 12 of the positioning of the valve stent in situ, FIG. 13 demonstrates a schematic, dorsal, intracardiac view of a fixed heart valved stent in the mitral position according to the intervention. Note the good alignment of the valved stent with the left atrial environment. Distances between the left atrial wall/mitral annulus and the valved stent are avoided. Heart valve and anchoring sutures for the ventricular apex have been omitted for simplification.

Claims (23)

  1. 1. A heart valve stent comprising: a body section equipped to receive a heart valve implant; a plurality of proximally disposed anchoring elements; a plurality of anchoring threads, each having a first end portion is attached to the stent, and a second end portion; and a thrust bearing for securing the second end portions of the plurality of anchoring threads to a distal heart chamber wall and the proximally disposed anchoring elements wherein the heart valve stent is formed as a truncated cone.
  2. 2. The heart valve stent according to claim 1, wherein the plurality of anchoring threads are affixed to an end portion of the stent body section that opposes the plurality of anchoring elements
  3. 3. The heart valve stent according to claim 1, further comprising at least one suture-length regulatory element for adjusting a length of at least one of the plurality of anchoring threads.
  4. 4. The heart valve stent according to claim 1, wherein the thrust bearing constitutes a suture-length regulatory element.
  5. 5. The heart valve stent according to claim 1, further comprising a heart valve implant received in the body section.
  6. 6. The heart valve stent according to claim 10, wherein, in a plane of the mitral valve, an annulus of the heart valve stent is substantially oval or u-shaped.
  7. 7. The heart valve stent according to claim 5, further comprising a sealing membrane adapted to be arranged between the heart valve implant and the stent.
  8. 8. The heart valve stent according to claim 5, further comprising a sealing membrane arranged between the plurality of anchoring elements and the heart valve implant.
  9. 9. The heart valve stent according to claim 1, wherein at least one of the plurality of anchoring elements is made from shape memory alloy.
  10. 10. The heart valve stent according to claim 5, wherein the heart valve implant constitutes a mitral valve.
  11. 11. A prosthetic mitral valve assembly, comprising: a radially-expandable stent including an outflow portion sized to be held in place by leaflets of a native mitral valve and an inflow portion having a flared end, the flared end sized to implant above or below an annulus of the mitral valve with a pressure or friction fit, wherein the stent substantially smoothly tapers from the flared end to an opposite end of the stent, the stent having a lumen extending therethrough, the lumen having an inflow diameter at the inflow portion and an outflow diameter at the outflow portion and wherein the inflow diameter is larger than the outflow diameter; and a valve portion shaped to fit the contours of the stent and coupled to the stent, the valve portion comprising prosthetic leaflets and elongate flexible tension members, each of the tension members coupled at a first end to one of the prosthetic leaflets and configured to be coupled at an opposite end to a patient's heart for preventing eversion of the prosthetic leaflets during ventricular contraction.
  12. 12. The prosthetic mitral valve assembly of claim 11, wherein the mitral valve assembly is adapted to expand into contact with the native mitral valve tissue to create the pressure or friction fit and secure the mitral valve assembly in a fixed position in the heart.
  13. 13. The prosthetic mitral valve assembly of claim 11, wherein the prosthetic leaflets form a bicuspid or tricuspid valve.
  14. 14. The prosthetic mitral valve assembly of claim 11, wherein the stent has a truncated conical shape.
  15. 15. The prosthetic mitral valve assembly of claim 11, wherein the stent and the valve portion are collapsible to a reduced diameter for insertion into the heart on a delivery catheter for implantation.
  16. 16. A prosthetic mitral valve assembly, comprising: a radially-expandable stent including a portion sized to be held in place by leaflets of a native mitral valve; and a valve portion coupled to the stent, the valve portion comprising prosthetic leaflets; elongate flexible tension members, each of the tension members having a first end coupled to one of the prosthetic leaflets and an opposite end adapted to be coupled to an inner wall of the left ventricle of a patient's heart for preventing eversion of the prosthetic leaflets during ventricular contraction, each leaflet coupled to a group of tension members, each group of tension members comprising a plurality of tension members, the opposite end of each tension member of each group adapted to be secured at spaced apart locations to an inner wall of the left ventricle, and a tensioning block corresponding to each group of tension members, each of the plurality of tension members of each group extending through the corresponding tensioning block, each tensioning block slidable upwards and downwards along the corresponding group of tension members to adjust a tension thereof.
  17. 17. The prosthetic mitral valve assembly of claim 16, wherein the mitral valve assembly is adapted to expand into contact with the native mitral valve tissue to create the pressure or friction fit and secure the mitral valve assembly in a fixed position in the heart.
  18. 18. The prosthetic mitral valve assembly of claim 16, wherein the prosthetic leaflets form a bicuspid or tricuspid valve.
  19. 19. The prosthetic mitral valve assembly of claim 16, wherein the stent and the valve portion are collapsible to a reduced diameter for insertion into the heart on a delivery catheter for implantation.
  20. 20. The prosthetic mitral valve assembly of claim 16, wherein each tension member attaches to the corresponding leaflet at a point adjacent the outflow edge of the leaflet.
  21. 21. A prosthetic mitral valve assembly, comprising: a radially-expandable stent including an outflow portion sized to be held in place by leaflets of a native mitral valve with a pressure or friction fit and an inflow portion having a flared end with a truncated conical shape, the flared end sized to be implanted above or below an annulus of the mitral valve with a pressure or friction fit, wherein the inflow portion has a larger flow area than the outflow portion and the stent has a substantially smooth and continuous taper from the flared end to an opposite end of the stent; and a valve portion shaped to fit the continuous taper of the stent and coupled to the stent, the valve portion having three prosthetic leaflets and three groups of two elongate flexible tension members, wherein each group of two tension members member is coupled to one of the prosthetic leaflets at a first end and each tension member comprises an anchor adapted to be coupled to a patient's heart along the wall of the ventricle at the opposite end, wherein each group of two tension members member has at least one slidable tension block configured to be positioned within the left ventricle between the first ends end and the second ends end of the group of two tension members, with the group of two tension members extending therethrough and slidable therealong used to adjust a the tension applied to each leaflet and wherein the tension members reduce stress on the prosthetic leaflets and prevent eversion during ventricular contraction.
  22. 22. The prosthetic mitral valve assembly of claim 21, wherein the tension members are made of polyurethane.
  23. 23. The prosthetic mitral valve assembly of claim 21, wherein the anchor of each tension member comprises a plurality of prongs that can grab, penetrate, and/or engage surrounding tissue to secure the device in place.
US13464367 2007-09-13 2012-05-04 Heart Valve Stent Abandoned US20120283824A1 (en)

Priority Applications (5)

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DE102007043830.5 2007-09-13
DE200710043830 DE102007043830A1 (en) 2007-09-13 2007-09-13 Heart valve stent
PCT/DE2008/001515 WO2009033469A1 (en) 2007-09-13 2008-09-10 Heart valve stent
US67795810 true 2010-09-09 2010-09-09
US13464367 US20120283824A1 (en) 2007-09-13 2012-05-04 Heart Valve Stent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13464367 US20120283824A1 (en) 2007-09-13 2012-05-04 Heart Valve Stent

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PCT/DE2008/001515 Continuation WO2009033469A1 (en) 2007-09-13 2008-09-10 Heart valve stent
US67795810 Continuation 2010-09-09 2010-09-09

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US20120283824A1 true true US20120283824A1 (en) 2012-11-08

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US12677958 Abandoned US20110004296A1 (en) 2007-09-13 2008-09-10 Heart Valve Stent
US13275751 Abandoned US20120035703A1 (en) 2007-09-13 2011-10-18 Truncated Conical Heart Valve Stent with Anchoring Threads and Methods of Use
US13275683 Active 2028-10-28 US9095433B2 (en) 2007-09-13 2011-10-18 Truncated cone heart valve stent
US13464367 Abandoned US20120283824A1 (en) 2007-09-13 2012-05-04 Heart Valve Stent
US14465437 Active US9078749B2 (en) 2007-09-13 2014-08-21 Truncated cone heart valve stent
US14746381 Active US9254192B2 (en) 2007-09-13 2015-06-22 Truncated cone heart valve stent
US15018473 Active 2028-09-12 US9730792B2 (en) 2007-09-13 2016-02-08 Truncated cone heart valve stent
US15653653 Pending US20170312076A1 (en) 2007-09-13 2017-07-19 Truncated cone heart valve stent

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US12677958 Abandoned US20110004296A1 (en) 2007-09-13 2008-09-10 Heart Valve Stent
US13275751 Abandoned US20120035703A1 (en) 2007-09-13 2011-10-18 Truncated Conical Heart Valve Stent with Anchoring Threads and Methods of Use
US13275683 Active 2028-10-28 US9095433B2 (en) 2007-09-13 2011-10-18 Truncated cone heart valve stent

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US14465437 Active US9078749B2 (en) 2007-09-13 2014-08-21 Truncated cone heart valve stent
US14746381 Active US9254192B2 (en) 2007-09-13 2015-06-22 Truncated cone heart valve stent
US15018473 Active 2028-09-12 US9730792B2 (en) 2007-09-13 2016-02-08 Truncated cone heart valve stent
US15653653 Pending US20170312076A1 (en) 2007-09-13 2017-07-19 Truncated cone heart valve stent

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EP (1) EP2194925B1 (en)
DE (5) DE102007043830A1 (en)
ES (1) ES2445589T3 (en)
WO (1) WO2009033469A1 (en)

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US20140364944A1 (en) 2014-12-11 application
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US9254192B2 (en) 2016-02-09 grant
US9095433B2 (en) 2015-08-04 grant
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US9730792B2 (en) 2017-08-15 grant
US20170312076A1 (en) 2017-11-02 application

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