WO2009033469A1 - Herzklappenstent - Google Patents

Herzklappenstent Download PDF

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Publication number
WO2009033469A1
WO2009033469A1 PCT/DE2008/001515 DE2008001515W WO2009033469A1 WO 2009033469 A1 WO2009033469 A1 WO 2009033469A1 DE 2008001515 W DE2008001515 W DE 2008001515W WO 2009033469 A1 WO2009033469 A1 WO 2009033469A1
Authority
WO
WIPO (PCT)
Prior art keywords
stent
heart valve
valve
heart
anchoring
Prior art date
Application number
PCT/DE2008/001515
Other languages
English (en)
French (fr)
Inventor
Georg Lutter
Lucian Lozonschi
Original Assignee
Georg Lutter
Lucian Lozonschi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US12/677,958 priority Critical patent/US20110004296A1/en
Priority to ES08801319.8T priority patent/ES2445589T3/es
Priority to EP08801319.8A priority patent/EP2194925B1/de
Application filed by Georg Lutter, Lucian Lozonschi filed Critical Georg Lutter
Publication of WO2009033469A1 publication Critical patent/WO2009033469A1/de
Priority to US13/275,751 priority patent/US20120035703A1/en
Priority to US13/275,683 priority patent/US9095433B2/en
Priority to US13/464,367 priority patent/US20120283824A1/en
Priority to US14/465,437 priority patent/US9078749B2/en
Priority to US14/746,381 priority patent/US9254192B2/en
Priority to US15/018,473 priority patent/US9730792B2/en
Priority to US15/653,653 priority patent/US10456248B2/en
Priority to US16/565,564 priority patent/US11213387B2/en
Priority to US17/505,734 priority patent/US20220039947A1/en

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Classifications

    • 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; Valves implantable in the body
    • 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; Valves implantable in the body 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; Valves implantable in the body
    • 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; Valves implantable in the body
    • 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; Valves implantable in the body
    • 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; Valves implantable in the body
    • 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

Definitions

  • the invention relates to a heart valve stent having a section set up for receiving a heart valve implant and having a plurality of anchoring elements arranged proximally.
  • Such heart valve stents are known in a variety of configurations for the replacement of malformed or pathologically altered heart valves.
  • the surgical implantation of heart valve prostheses is performed regularly on the cardioplegic heart.
  • the old, functionally impaired heart valve is cut out and the implanted heart valve prosthesis sewn.
  • the tendon threads ⁇ chordae tendineae) of the mitral valve should be retained as far as possible in their structure in order to obtain or achieve the ventricular geometry and thus the best possible function of the left ventricle as far as possible. It is of great importance that the anterior (anterior) mitral valve leaflet is not simply pushed in the free space towards the left ventricle, but is attached to the mitral valve annulus to allow for forward urging of the anterior mitral valve leaflet into the outflow tract. the left ventricle (Sam's phenomenon: systolic anterior movement) is prevented. This is extremely important because otherwise it can quickly lead to left heart decompensation (massive misconduct of the left ventricle).
  • the old mitral valve is attached to the old annulus, so that there is an unimpeded blood flow through the valve and through the two adjoining chambers of the heart.
  • the prosthetic heart valve is surgically implanted in this annulus by suturing.
  • DE 195 46 692 C2 or EP 1 469 797 B1 discloses a self-expandable cardiac valve prosthesis for implantation in the human body via a catheter system having a heart valve and a collapsible and expandable stent connected to the heart valve.
  • a self-expanding heart valve prosthesis can be guided by a catheter system through a groin artery to the implantation at the heart. After reaching the implantation site, such a stent, which is composed in its longitudinal direction of a plurality of self-expanding segments which can be bent relative to one another, can then be unfolded successively. After deployment, the heart valve prosthesis can be anchored with the aid of anchoring hooks, at least in the area close to the heart, in the respective blood vessel.
  • a better positioning and angular alignment can be achieved by the stent known from EP 1 469 797 B1, in which so-called support brackets are formed, which can be introduced into the aortic pockets and thus produce a defined distance to the aortic valve.
  • the object is achieved by the heart valve stent having the features of claim 1.
  • the subclaims reflect advantageous embodiments of the invention.
  • the basic idea of the invention is to create a heart valve stent which creates the anatomical prerequisites for a natural function, similar to a healthy heart.
  • a minimally invasive operation which ensures exact positioning and secure fixation of the valve stent, is made possible with the heart valve stent according to the invention in the self-expanding foldable embodiment.
  • the heart valve stent according to the invention is designed as a mitral valve stent, a tension between mitral valve and ventricle similar to the natural tendon thread tension (the chordae tendineae) is generated and at the same time ensured that the valve components of the old mitral valve (in particular the anterior mitral valve leaflet) no longer the flow of the Disturb blood.
  • valve stent according to the invention is catheter-assisted introduced through one of the heart chambers or the adjacent large vessels of the heart, then can unfold in one of the heart chambers, wherein its anchoring elements are fixed in the tissue. Finally, the stent is fixed to the subvalvular heart chamber wall opposite the stent with formation of a tension between the ventricular wall and the proximal, supravalvularly anchored anchoring elements with anchoring threads (also referred to below as neo-chordae).
  • the fixation of the anchoring threads in the distal heart chamber wall thus constitutes an abutment to the proximal anchoring elements, which abutment can be achieved, for example, by a knee joint. or formed by another element acting as an abutment.
  • This abutment can preferably also be designed as Kladeninnstellelement.
  • Advantages of the heart valve stent according to the invention are thus accurate and simple fixation of the heart valve stent with minimally invasive surgery and improved contractility of the heart over conventional valve stents.
  • the anchoring threads aligned axially with respect to the longitudinal axis of the valve stent according to the invention are fastened with their one end to the annulus of Herzklappenimp- lantat so that when forming the voltage between the stent and Herzhuntwandung a direct effect on the positioning and angulare orientation of the flap can be achieved.
  • the anchoring threads may also be connected to the stent at the distal flap stem.
  • the connection between the anchoring thread and the stent must be made such that a tension running in the axial direction substantially in relation to the longitudinal axis of the stent can be formed between the proximal anchoring elements and the distal abutment.
  • the anchoring threads (neo-chordae) elements for length adjustment of the anchoring thread with the length of the anchoring threads for setting a certain voltage between heart valve stent and heart wall can be adjusted.
  • a Dermathomae be provided for each thread or, for example, a Kaydeninnstellelement for all threads together.
  • the filament length adjusting element is preferably made small and can be set up, for example, such that the element shortens the thread to the desired length by winding up an excess thread length.
  • the design of elastic anchoring threads in the axial direction which can react to contraction movements of the heart, without an excessively long thread length, which could adversely affect cardiac function.
  • the length of the thread should be chosen so that the elasticity is not completely at the expense of the tension between the anchoring elements and the heart wall. If the abutment is designed as Kladeninnstellelement, there is a particularly advantageous embodiment, since this also a readjustment of the voltage between anchoring elements and abutment, so a re-tensioning the anchoring is possible without the heart would have to be opened.
  • the structure of the mitral valve stent in the plane of the mitral valve annulus is substantially oval or U-shaped, so that no pressure is exerted on the left ventricular outflow tract (LVOT) and / or aortic annulus and therewith impaired cardiac function Missing (Ma L, Tozzi P, Huber CH, Taub S 5 Gerelle G, by Segesser LK) Double crowned valved stents for off-pump mitral valve replacement. Eur J Cardiothorac Surg. 2005 Aug; 28 (2): 194-8 ; discussion 198-9).
  • This valve stent receives a highly conforming shape, perfectly adapted to the natural mitral valve apparatus, so that this conically tapering (cranial-caudal axis) not quite circular (oval-like in the transversal axis) valve stent strongly adapts to the natural shape
  • the mitral valve can create and lean against.
  • the valve stent In the anterior mitral annulus annulus, the valve stent is shallow and results in almost no pressure and no constriction on the LVOT. It is oval in the area of the posterior mitral annulus and reproduces the shape of the posterior annulus.
  • This valve stent forms a thin, cranial-caudal structure, which conforms completely to the mitral valve in shape and thus looks like a negative impression in the region of the natural mitral valve annulus.
  • the valve stent touches the old mitral valve and its annulus, it leaves them almost completely unchanged in their anatomy.
  • Fig. 1 shows a preferred embodiment of the valve stent according to the invention in a schematic side view
  • FIG. 2 shows the exemplary embodiment shown in FIG. 1 in plan view from above;
  • Fig. 3 is a plan view of a plurality of particularly preferred trained flap stents according to the invention.
  • FIG. 5 shows a schematic view to illustrate the minimally invasive transplantation of a mitral valve stent according to the invention in a first phase when introducing the mitral valve stent according to the invention to the transplantation site;
  • Fig. 6 is a schematic view illustrating the minimally invasive transplantation of a mitral valve stent according to the invention in a second phase after positioning of the mitral valve;
  • FIG. 7 shows a schematic view to illustrate the minimally invasive transplantation of a mitral valve stent according to the invention after completion of the fixation of the anchoring threads outside the apex of the left ventricular heart wall;
  • FIG. 8 shows a schematic view of an alternative intracardiac fixation of the anchoring threads in the region of the papillary muscles
  • FIG. 9 is a schematic view of a fixed in the aortic annulus heart valve stent according to the invention.
  • 10 is a schematic view of a fixed in the pulmonary position heart valve stent according to the invention.
  • Figure 11 is a schematic view of a fixed in the tricuspid position heart valve stent according to the invention.
  • valve stent 12 shows a particularly preferred exemplary embodiment of the valve stent according to the invention in a schematic side view without heart valve and anchoring thread
  • FIG. 13 shows a schematic, dorsal, intracardial view of a heart valve stent fixed in the mitral position according to the invention.
  • FIG. 1 to 11 show the inventive stent for implantation and attachment of heart valve prostheses in various views to illustrate the structure of the stent and the spatial relationships of the individual stent sections to each other in unfolded ( Figures 1-4 and 6-11) and in the folded state (Figure 5).
  • FIG. 1 shows a foldable mitral valve stent 10 according to the invention in a perspective lateral view.
  • the stent 10 essentially has three sections: Proximal
  • anchoring elements 20 are arranged, which implanted the valve stent 10 in the
  • Anchor state supravalvular or atrial
  • the conical and oval-shaped cross-sectionally shaped stent body 30 Disposed distally adjacent to one another is the conical and oval-shaped cross-sectionally shaped stent body 30, which is preferably flattened to the LVOT (compare FIG. 2).
  • the stent body 30 forms a basket or trapezoidal figure that conforms to the mitral valve annulus and extends toward the left ventricle.
  • This stent 10 is held in the atrium by its tapered shape and by the atrial anchorage.
  • a two- or dreizipflige flap 50 may be integrated.
  • Anchoring threads 40 which are arranged distally from this stent body 30 for anchoring the entire stent 10, are located distally to the stent body 30 (towards the left ventricle). These anchoring threads 40 provide anchoring in the opposite
  • Ventricular wall or e.g. in the area of the papillary muscle (proximal, medial or distal
  • These anchoring threads 40 can be positioned by means of an adjustable thread length adjustment element 70 and adjusted to the optimum length, so that the heart valve stent 10 can then be fixed and anchored.
  • Fig. 2 shows the stent 10 in a plan view. It can be seen that the stent 10 forms a neo-annulus or stent body 30, into which the heart valve prosthesis 50 can be inserted and to which it can be attached. Furthermore, it can be seen that the stent 10 according to the invention may be designed asymmetrically with respect to the plurality of supravalvular (atrial) stent bars 20. This can be seen from the fact that the stent body 30 is oval-shaped in this figure and flattened on one side, that is substantially U-shaped, so that it can be used at this flattened point in the direction of LVOTs.
  • FIG. 4 shows the stent 10 according to the invention in a bottom view. It can be seen that the diameter of the atrial portion to the ventricular portion of the stent body
  • Both the fasteners 20 and the stent body 30 may be provided with fabric (e.g., plastic,
  • FIGS. 5 to 7 and 8 describe the retrograde transapical implantation of a valve stent.
  • the retrograde transaortic as well as the antegrade transatrial access route may alternatively be performed.
  • the placement of the valve stent with a folded valve stent over the old mitral valve annulus is shown in FIG.
  • the deployment of the atrial anchoring elements 20 e.g., preferably self-expanding
  • Positioning in the left atrium should be done so that the flattened side of the stent body 30 is in the direction of being LVOT (aortic valve).
  • the stent is then expanded further.
  • Fig. 6 shows the expanded valve stent 10 in the left atrio-ventricular inflow tract.
  • Anchoring threads 40 are adjusted on, in or outside the heart wall and later - as shown in Fig. 7 - fixed by means of the preferably designed as Kladeninnstellelement abutment 80.
  • the length of the anchoring threads 40 i.a. also a visualization of the mitral valve apparatus (eg echo, CT or NMR) so that the annulus can be pulled optimally in the direction of the ventricle wall by means of the new stent 10, there is no paravalvular leak, the stent 10 is well fixed and the mitral valve annulus and apparatus advantageously supports the left ventricular function.
  • the mitral valve apparatus eg echo, CT or NMR
  • the anchoring threads 40 can also be attached to the papillary muscles (see FIG. 8), so that these threads 40 represent neo-chordae and can take over the function of the inactive chordae tendineae.
  • the anchoring threads 40 are fastened to the heart wall in each case by means of an abutment 80, which can be designed as a knot or as an independent element.
  • the ventricular anchoring threads 40 are attached not only to the stent body 30 but also to the integrated flap itself. These caudal anchoring cords 40 may also be fixed at any other point in the ventricle.
  • FIG. 7 shows the completed positioning and fixation of the stent 10.
  • the adjustable thread length adjusting element 70 serves to optimally adjust the length and position of the flap stent 10 and thus of the valve prosthesis 50.
  • Different threads 40 may have different lengths and attachment positions in the ventricle.
  • FIG. 9 to 11 show further examples of the use of the heart valve stent 10 according to the invention, wherein the stent 10 is adapted to the respective anatomy (for the aortic and pulmonary valve position a more circular shape (see Fig. 3) and for Tricuspid position is a rather oval shape).
  • FIG. 12 shows a particularly preferred embodiment of the valve stent according to the invention in a schematic side view, which is shown for clarity without heart valve and anchoring threads.
  • FIG. 13 shows a schematic, dorsal, intracardial view of a heart valve stent fixed in the mitral position according to the invention. Note the good nestling of the valve stent to the left atrial environment. Distances between the left atrial wall / mitral annulus and the valve stent are thus avoided. Heart valve and anchoring thread to the ventricular tip have been omitted for ease of illustration.

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Abstract

Herzklappenstent (10) mit einem zur Aufnahme eines Herzklappenimplantats (30) eingerichteten Abschnitt und mit einer Mehrzahl von proximal angeordneten Verankerungselementen (20), gekennzeichnet durch eine Mehrzahl von Verankerungsfäden (40), die mit ihrem einen Ende am Stent (10) befestigt sind, und einem die Verankerungsfäden (40) mit ihrem anderen Ende an der distalen Herzkammerwandung unter Ausbildung einer Spannung zwischen der Herzkammerwandung und den proximal verankerten Verankerungselementen (20) befestigenden Widerlager (80).

Description

Herzklappenstent
Die Erfindung betrifft einen Herzklappenstent mit einem zur Aufnahme eines Herzklappenimplantats eingerichteten Abschnitt und mit einer Mehrzahl von proximal angeordneten Verankerungselementen.
Derartige Herzklappenstents sind in einer Vielzahl von Ausbildungen zum Ersatz fehlgebilde- ter oder krankhaft veränderter Herzklappen bekannt. Dabei wird die chirurgische Implantation von Herzklappenprothesen regelmäßig am kardioplegischen Herzen durchgeführt. Die alte, in ihrer Funktion beeinträchtigte Herzklappe wird herausgeschnitten und die zu implantierende Herzklappenprothese eingenäht.
Bei Vorliegen von Erkrankungen der Mitralklappe hingegen wird versucht, die alte Klappe trotz aufgetretener Fehlfunktion weitestgehend zu erhalten, damit der gesamte dynamische Mitralklappenapparat nicht zerstört wird. Das liegt daran, dass z.B. die an der Mitralklappe ansetzenden Sehnenfäden (chordae tendineae) für die Ventrikelfunktion sehr wichtig sind und daher möglichst nicht von der alten Mitralklappe losgelöst werden sollten.
Ideal ist es daher, die Mitralklappe (wenn sie nicht rekonstruiert werden kann) weitestgehend zur Seite zu drängen, um der Klappenprothese Platz zu machen. Der Platz spielt hier eine nicht so gravierende Rolle wie in dem Aortenannulus, bei dem eine Einengung viel leichter zu Stande kommt (z.B. beim Verdrängen der alten Aortenklappe bei rein perkutaner Implantati- on).
Die Sehnenfäden {chordae tendineae) der Mitralklappe sollten dabei nach Möglichkeit in ihrer Struktur erhalten bleiben, um die Ventrikelgeometrie und damit eine bestmögliche Funktion der linken Kammer weitestgehend zu erhalten bzw. zu erreichen. Hierbei ist es von enor- mer Bedeutung, dass das vordere (anteriore) Mitralklappensegel nicht einfach in den freien Raum Richtung linken Ventrikel gedrückt wird, sondern an den Mitralklappenannulus angeheftet wird, damit ein Vorwärts-Drängen des vorderen Mitralklappensegels in den Ausfluss- trakt des linken Ventrikels (Sam-Phänomen: Systolic Anterior Movement) verhindert wird. Dieses ist außerordentlich wichtig, da es sonst schnell zu einer Linksherz-Dekompensation (massives Fehlverhalten des linken Ventrikels) kommen kann.
Chirurgisch wird also die alte Mitralklappe an den alten Annulus angeheftet, so dass ein ungehinderter Blutfluss durch die Klappe und durch die beiden anliegenden Herzkammern gegeben ist. Nach dem Zurückdrängen (dem Anheften der Klappe an den Annulus) wird die Herzklappenprothese chirurgisch in diesen Annulus durch Einnähen implantiert.
Diese aufwendige Methode geschieht obligatorisch unter zur Hilfenahme der Herz-Lungen- Maschine und kommt für Hochrisikopatienten regelmäßig nicht in Frage, sodass nach mini- mal-invasiven oder perkutanen Methoden zur Implantation einer Herzklappe gesucht wird.
So ist aus der DE 195 46 692 C2 oder in EP 1 469 797 Bl eine selbstexpandierbare Herzklap- penprothese zur Implantation im menschlichen Körper über ein Kathetersystem mit einer Herzklappe und mit einem mit der Herzklappe verbundenen zusammenfaltbaren und expandierbaren Stent bekannt. Eine solche selbstexpandierbare Herzklappenprothese kann mit Hilfe eines Kathetersystems durch eine Leistenarterie bis hin zum Implantationsort am Herzen geführt werden. Nach Erreichen des Implantationsortes kann dann ein solcher Stent, der in sei- ner Längsrichtung aus mehreren relativ zueinander abwinkelbaren selbstexpandierenden Segmenten zusammengesetzt ist, sukzessiv entfaltet werden. Nach der Entfaltung kann die Herzklappenprothese mit Unterstützung von Verankerungshaken zumindest im herznahen Bereich im jeweiligen Blutgefäss verankert werden.
Eine weitere Vorrichtung zur Befestigung und Verankerung von Herklappenprothesen ist in der DE 100 10 074 Al beschrieben, die im Wesentlichen aus drahtförmigen miteinander verbundenen Elementen gebildet wird. Verschieden ausgebildete Bügel werden hierbei eingesetzt, um eine sichere Befestigung und Abstützung einer Herzklappe zu erreichen. Bei diesen bekannten Lösungen besteht jedoch die Gefahr einer Fehlimplantation von Herklappen durch fehlerhafte Positionierung und der fehlerhafte angulare Ausrichtung der zu implantierenden Herzklappenprothese.
Eine bessere Positionierung und angulare Ausrichtung kann durch den aus der EP 1 469 797 Bl bekannten Stent erreicht werden, bei dem sogenannte Stützbügel ausgebildet sind, die in die Aortentaschen einführbar sind und so eine definierte Entfernung zur Aortenklappe herstellen. Darüber hinaus besteht auch die Möglichkeit eine fehlgeschlagene Implantation einer Herzklappenprothese abzubrechen und den Klappenstent wieder in das Kathetersystem bzw. die sogenannte die Kartusche hineinzuziehen. Hierbei wird dann der gesamte Stent zusammengefaltet und in die Kartusche zurückgeführt. Dabei ist es möglich den Stent erneut heraus gleiten zu lassen, sodass eine gute Positionierung für den Klappenstent nach mehreren Positionierungsversuchen erreicht werden kann („sliding technique").
Ein weitaus größeres Problem für die optimale Platzierung der neuen Herzklappe im Stent (bzw. Klappenstent) besteht jedoch darin, dass die alte native Klappe in den meisten Fällen der zuvor beschriebenen Implantationstechnik nicht entfernt werden soll.
Dies führt jedoch dazu, dass die neue Klappe, die in eine alte, deformierte Klappe hineinge- drückt (teilweise hineingequetscht) wird, in ihrer ursprünglichen Stentform abgewandelt wird. Dies liegt daran, dass der Implantationsort für den Klappenstent durch die Anatomie, den Zustand und die Beschaffenheit der alten nativen Klappe bestimmt wird (z.B. bei Klappensklerose oder -Verkalkung der nativen Klappe).
Daher bestimmt der alte Klappenannulus mit den dazugehörigen veränderten Klappen/Taschen inwieweit und wohin sich die neue Klappe entfalten und damit in ihrer Form entwickeln kann. Somit ist also nicht nur die Verankerung/Positionierung wichtig, um eine optimale Klappenfunktion, sowie Vorhof- und Ventrikelfunktion zu erhalten, sondern auch das Einpassen des Klappenstents in den Neo-Annulus (alter Klappenannulus bildet diesen mit alter Klappe aus) und damit das Zurückdrängen der alten Klappe. Ausgehend von den bei den bekannten Herzklappenstents auftretenden Problemen, ist es daher Aufgabe der Erfindung einen Herzklappenstent, insbesondere einen Mitralklappenstent für die minimal-invasive Transplantation, zu schaffen, der eine möglichst natürliche Funktionsausübung des Herzens ermöglicht.
Erfindungsgemäß wird die Aufgabe durch den Herzklappenstent mit den Merkmalen von Anspruch 1 gelöst. Die Unteransprüche geben vorteilhafte Ausgestaltungen der Erfindung wieder.
Grundgedanke der Erfindung ist es, einen Herzklappenstent zu schaffen, der die anatomischen Voraussetzungen für eine natürliche Funktionsausübung, ähnlich einem gesunden Herz, schafft. Dabei ist mit dem erfindungsgemäßen Herzklappenstent in der selbstexpandierend faltbaren Ausgestaltung eine minimal-invasive Operation ermöglicht, die eine exakte Positionierung und sichere Fixierung des Klappenstents gewährleistet. Dabei wird, insbesondere bei Ausbildung des erfindungsgemäßen Herzklappenstents als Mitralklappenstent, eine Spannung zwischen Mitralklappe und Ventrikel ähnlich der natürlichen Sehnenfadenspannung (der chordae tendineae) erzeugt und gleichzeitig dafür gesorgt, dass die Klappenanteile der alten Mitralklappe (insbesondere das anteriore Mitralklappensegel) nicht mehr den Durchfluss des Blutes stören.
Es ist also vorgesehen, dass der Klappenstent nach der Erfindung kathetergestützt durch eines der Herzkammern oder der angrenzenden, großen Gefäße des Herzens eingeführt wird, sich dann in einer der Herzkammern entfalten kann, wobei seine Verankerungselemente im Gewebe fixiert werden. Abschließend wird der Stent an der dem Stent gegenüberliegenden, subval- vulären Herzkammerwandung unter Ausbildung einer Spannung zwischen der Herzkammerwandung und den proximal, supravalvulär verankerten Verankerungselementen mit Verankerungsfäden (im Folgenden auch neo-chordae genannt) fixiert.
Die Fixierung der Verankerungsfäden in der distalen Herzkammerwandung stellt also zu den proximalen Verankerungselementen ein Widerlager dar, das beispielsweise durch einen Kno- ten oder durch ein anderes als Widerlager wirkendes Element gebildet wird. Dieses Widerlager kann bevorzugt auch als Fädenlängenstellelement ausgebildet sein.
Vorteile des erfindungsgemäßen Herzklappenstents sind also genaue und einfache Fixierung des Herzklappenstents bei minimal-invasiver Operation und verbesserte Kontraktilität des Herzens gegenüber herkömmlichen Klappenstents.
Bevorzugt sind die im Verhältnis zur Längsachse des erfindungsgemäßen Klappenstents axial ausgerichteten Verankerungsfäden mit ihrem einen Ende am Annulus des Herzklappenimp- lantats befestigt, sodass bei Ausbildung der Spannung zwischen Stent und Herzkammerwandung eine direkte Wirkung auf die Positionierung und angulare Ausrichtung der Klappe erreicht werden kann. Die Verankerungsfäden können jedoch auch am distalen Klappensten- tumfang mit dem Stent verbunden sein. Die Verbindung zwischen Verankerungsfaden und Stent muss jedoch so vorgenommen sein, dass eine im Wesentlichen im Verhältnis zur Längsachse des Stents in axialer Richtung verlaufende Spannung zwischen proximalen Verankerungselementen und distalem Widerlager ausgebildet werden kann.
Nach einer weiteren bevorzugten Ausgestaltung der Erfindung weisen die Verankerungsfäden (neo-chordae) Elemente zur Längenverstellung der Verankerungsfaden auf, mit den die Län- ge der Verankerungsfäden zum Einstellen einer bestimmten Spannung zwischen Herzklap- penstent und Herzwandung eingestellt werden kann. Dabei kann beispielsweise ein Fädenlängenstellelement für je einen Faden oder beispielweise ein Fädenlängenstellelement für alle Fäden gemeinsam vorgesehen sein. Das Fädenlängenstellelement ist bevorzugt klein ausgebildet und kann beispielsweise derart eingerichtet sein, dass das Element durch Aufwickeln einer überschüssigen Fadenlänge den Faden auf die gewünschte Länge verkürzt.
Bevorzugt ist auch die Ausgestaltung von in axialer Richtung elastischen Verankerungsfäden, diese auf Kontraktionsbewegungen des Herzens reagieren können, ohne dass eine zu große Fadenlänge vorliegt, die die Herzfunktion negativ beeinflussen könnte. Dabei ist die Faden- länge so zu wählen, dass die Elastizität nicht vollständig auf Kosten der Spannung zwischen Verankerungselementen und Herzwandung geht. Ist das Widerlager als Fädenlängenstellelement ausgebildet, ergibt sich eine besonders vorteilhafte Ausgestaltung, da hiermit auch eine Nacheinstellung der Spannung zwischen Verankerungselementen und Widerlager, also ein Nachspannen der Verankerungsraden möglich ist, ohne dass das Herz geöffnet werden müsste.
Besonders bevorzugt ist die Struktur des Mitralklappenstents in der Ebene des Mitralklappe- nannulus im Wesentlichen oval oder U-förmig ausgebildet, dass kein Druck auf den LVOT (Left Ventrikulär Outflow Tract; linksventrikulärer Ausflusstrakt) und/oder Aortenannulus ausgeübt wird und damit eine Beeinträchtigung der Herzfunktion unterbleibt (Ma L, Tozzi P, Huber CH, Taub S5 Gerelle G, von Segesser LK. Double-crowned valved Stents for off-pump mitral valve replacement. Eur J Cardiothorac Surg. 2005 Aug; 28(2): 194-8; discussion 198- 9.). Auch bleibt der subvalvuläre Apparat in seiner natürlichen Anatomie dadurch vollkommen erhalten und wird nicht beeinträchtigt (Boudjemline Y, Agnoletti G, Bonnet D, Behr L, Borenstein N, Sidi D, Bonhoeffer P. Steps toward the percutaneous replacement of atrioven- tricular valves an experimental study. J Am Coli Cardiol. 2005 JuI 19,46(2). -360-5).
Dieser Klappenstent erhält eine dem natürlichen Mitralklappen-Apparat vollkommen ange- passte, äußerst anschmiegende Form, so dass sich dieser konisch-zulaufende (kranial-caudale Achse) nicht ganz zirkuläre (oval-ähnlich in der transversalen Achse) Klappenstent sehr stark an die natürliche Form der Mitralklappe anlegen und anlehnen kann. Im Bereich des anterioren Mitralklappenannulus ist der Klappenstent flach und führt zu fast keinem Druck und zu keiner Einengung auf den LVOT. Im Bereich des posterioren Mitralklappenannulus ist er oval und bildet die Form des posterioren Annulus nach. Dieser Klappenstent bildet eine dünne, in der Länge (cranial-caudal) begrenzte Struktur, die sich in seiner Form vollkommen an die Mitralklappe anschmiegt und damit aussieht wie ein Negativabdruck im Bereich des natürlichen Mitralklappenannulus. Der Klappenstent berührt zwar die alte Mitralklappe und deren Annulus, jedoch belässt er diese in ihrer Anatomie fast vollkommen unverändert.
Die Erfindung wird im Folgenden anhand von in den beigefügten Zeichnungen abgebildeten besonders bevorzugten Ausführungsbeispielen näher erläutert. Es zeigen: Fig. 1 ein bevorzugtes Ausführungsbeispiel des erfindungsgemäßen Klappenstents in einer schematischen Seitenansicht;
Fig. 2 das in Fig. 1 gezeigte Ausfuhrungsbeispiel in Draufsicht von oben;
Fig. 3 eine Draufsicht auf mehrere besonders bevorzugt ausgebildete Klappenstents nach der Erfindung;
Fig. 4 eine Draufsicht auf ein Ausfuhrungsbeispiel von unten;
Fig. 5 eine schematische Ansicht zur Verdeutlichung der minimal-invasiven Transplantation eines Mitralklappenstents nach der Erfindung in einer ersten Phase bei Einbringen des erfmdungsgemäßen Mitralklappenstents an den Transplantationsort;
Fig. 6 eine schematische Ansicht zur Verdeutlichung der minimal-invasiven Transplantation eines Mitralklappenstents nach der Erfindung in einer zweiten Phase nach Positionierung der Mitralklappe;
Fig. 7 eine schematische Ansicht zur Verdeutlichung der minimal-invasiven Transplantation eines Mitralklappenstents nach der Erfindung nach Abschluss der Fixierung der Verankerungsfäden außerhalb des Apex der linkventrikulären Herzwandung;
Fig. 8 eine schematische Ansicht einer alternativen, intracardialen Fixierung der Verankerungsfäden im Bereich der Papillarmuskeln;
Fig. 9 eine schematische Ansicht eines im Aortenannulus fixierten Herzklap- penstents nach der Erfindung; Fig. 10 eine schematische Ansicht eines in der Pulmonalposition fixierten Herzklap- penstents nach der Erfindung;
Fig. 11 eine schematische Ansicht eines in der Trikuspidalposition fixierten Herzklappenstents nach der Erfindung;
Fig. 12 ein besonders bevorzugtes Ausfuhrungsbeispiel des erfindungsgemäßen Klappenstents in einer schematischen Seitenansicht ohne Herzklappe und Verankerungsfaden; und
Fig. 13 eine schematische, dorsale, intracardiale Ansicht eines in der Mitralposition fixierten Herzklappenstents nach der Erfindung.
Die Fig. 1 bis 11 zeigen den erfmdungsgemäßen Stent zur Implantation und Befestigung von Herzklappenprothesen in verschiedenen Ansichten zur Verdeutlichung des Aufbaus des Stents und der räumlichen Verhältnisse der einzelnen Stentabschnitte zueinander im entfalteten (Fig. 1-4 und 6-11) und im gefalteten Zustand (Fig. 5).
Fig. 1 zeigt einen faltbaren Mitralklappenstent 10 nach der Erfindung in einer perspektivi- sehen Lateralansicht. Der Stent 10 weist im Wesentlichen drei Abschnitte auf: Proximal
(supravalvulär) sind am Stent 10 kreisförmig eine Vielzahl von gezackt- oder bogenförmigen
(Fig. 3) Verankerungselementen 20 angeordnet, die den Klappenstent 10 im implantierten
Zustand supravalvulär (bzw. atrial) verankern. Distal benachbart angeordnet befindet sich der konisch- und im Querschnitt ovalartig geformte, zum LVOT bevorzugt abgeflachte Stentkör- per 30 (vgl. Fig. 2).
Der Stentkörper 30 bildet eine korb- oder trapezähnliche Figur, die sich an den Mitralklappe- nannulus anschmiegt und sich in Richtung des linken Ventrikels erstreckt. Gehalten wird dieser Stent 10 im Atrium durch seine konisch zulaufende Form und durch die atrialen Veranke- rungselemente 20. In diesen Stentkörper 30 kann eine zwei- oder dreizipflige Klappe 50 integriert sein.
An dem Stentkörper 30 befinden sich distal (zum linken Ventrikel hin) Verankerungsfäden 40, die distal von diesem Stentkörper 30 zur Verankerung des gesamten Stents 10 eingerichtet sind. Diese Verankerungsfäden 40 sorgen für eine Verankerung in der gegenüberliegenden
Ventrikelwand oder z.B. im Bereich des Papillarmuskels (proximale, medialer oder distaler
Papillarmuskelanteil); vgl. Fig. 7 und 8. Diese Verankerungsfäden 40 können mittels eines adjustierbaren Fadenlängenstellelements 70 positioniert und mit der optimalen Länge einge- stellt werden, so dass der Herzklappenstent 10 dann fixiert und verankert werden können.
Fig. 2 zeigt den Stent 10 in einer Draufsicht. Dabei ist zu erkennen, dass der Stent 10 einen Neo-Annulus, bzw. Stentkörper 30 ausbildet, in den die Herzklappenprothese 50 eingesetzt und an dem sie befestigt werden kann. Weiterhin ist zu erkennen, dass der erfindungs gemäße Stent 10 in Bezug auf die Vielzahl von supravalvulären (atrialen) Stentbügel 20 asymmetrisch ausgebildet sein kann. Dieses ist daran zu erkennen, dass der Stentkörper 30 in dieser Abbildung ovalartig ausgebildet und an einer Seite abgeflacht, also im Wesentlichen U-förmig ausgebildet ist, so dass er an dieser abgeflachten Stelle in die Richtung des LVOTs eingesetzt werden kann. Diese Abflachung bewirkt, dass an dieser Stelle kein Druck auf den LVOT und die Aortenklappe durch den selsbstexpandierbaren Stent ausgeübt werden kann, wenn der Stent 10 z.B. in die Mitralposition eingesetzt wird. Weitere bevorzugte Ausgestaltungen des Stents 10 nach der Erfindung sind in Fig. 3 gezeigt.
Fig. 4 zeigt den erfindungsgemäßen Stent 10 in einer Unteransicht. Hieraus wird deutlich, dass sich der Durchmesser von dem atrialen Anteil zum ventrikulären Anteil des Stentkörpers
30 verringert, so dass dieser von lateral aussieht wie ein Kegelstumpf (vgl. Fig. 1). Sowohl die Befestigungselemente 20 als auch der Stentkörper 30 können mit Stoff (z.B. Kunststoff,
Perikard, PTFE oder Goretex, etc.) bezogen sein, um eine verbesserte Abdichtung zwischen der Herzklappenprothese 50, Stentkörper 30 und der umgebenden Herzstruktur zu erreichen. Diese Abdichungsmembran wird dann zwischen Herzklappenprothese 50 und Stentkörper 30 oder auf die atrialen Stentstreben 20 ein-, bzw. aufgezogen, um eine optimale Abdichtung der Klappe zwischen den beiden Herzkammern zu erreichen.
In den Fig. 5 bis 7 und 8 wird die retrograde transapikale Implantation eines Klappenstents beschrieben. Der retrograde transaortale als auch der antegrade transatriale Zugangsweg kann alternativ durchgeführt werden. Die Platzierung des Klappenstents mit einem gefalteten Klappenstent über dem alten Mitralklappen- Annulus ist in Fig. 5 gezeigt. Nach erfolgreicher Orientierung mittels Markierungen am Klappenstent 10 (nicht gezeigt) kann langsam mit der Entfaltung (z.B. bevorzugt selbstexpandierend) der atrialen Verankerungselemente 20 begon- nen werden. Die Positionierung im linken Atrium sollte so geschehen, dass die abgeflachte Seite des Stentkörpers 30 in die Richtung es LVOT (Aortenklappe) zu liegen kommt. Der Stent wird dann weiter expandiert.
Fig. 6 zeigt den expandierten Klappenstent 10 in dem links-atrioventrikularen Einflusstrakt. Verankerungsfäden 40 werden an, in oder außerhalb der Herzwand adjustiert und später - wie in Fig. 7 dargestellt — mit Hilfe des bevorzugt als Fädenlängenstellelement ausgebildeten Widerlagers 80 fixiert. Während des Adjustierens der Länge der Verankerungsfäden 40 erfolgt u.a. auch eine Visualisierung des Mitralklappenapparates (z.B. Echo, CT oder NMR), sodass der Annulus mittels des neuen Stents 10 optimal in Richtung Ventrikelwand gezogen werden kann, kein paravalvuläres Leck mehr besteht, der Stent 10 gut fixiert ist und der Mitralklap- pen-annulus und -apparat vorteilhaft die linksventrikuläre Funktion unterstützt.
Alternativ zu Fig. 7 können die Verankerungsfäden 40 auch an den Papillarmuskeln befestigt werden (siehe Fig. 8), so dass diese Fäden 40 neo-chordae darstellen und die Funktion der außer Funktion gesetzten chordae tendineae übernehmen können. Die Befestigung der Verankerungsfäden 40 an der Herzwandung erfolgt jeweils mittels eines Widerlagers 80, das als Knoten oder auch als eigenständiges Element ausgebildet sein kann. Auch ist es möglich, dass die ventrikulären Verankerungsfäden 40 nicht nur am Stentkörper 30, sondern auch an der integrierten Klappe selbst angebracht werden. Auch können diese kaudalen Verankerungsfä- den 40 an jedem anderen Punkt im Ventrikel fixiert werden. Die Fig. 7 zeigt die vollendete Positionierung und Fixierung des Stents 10. Nach Längen und Lagebestimmung der einzelnen Verankerungsfäden 40 werden diese mittels des adjustierbaren Fadenlängenstellelements 70 z.B. in der links ventrikulären Wand fixiert. Das Fadenlän- genstellelement 70 dient der optimalen Einstellung der Länge und der Position des Klap- penstents 10 und damit der Klappenprothese 50. Unterschiedliche Fäden 40 können unterschiedliche Längen und Befestigungspositionen im Ventrikel aufweisen.
Die Fig. 9 bis 11 zeigen weitere Beispiele für den Einsatz des Herzklappenstents 10 nach der Erfindung, wobei der Stent 10 an die jeweilige Anatomie angepasst ist (für die Aorten- und Pulmonalklappenposition eine eher zirkuläre Form (vgl. Fig. 3) und für die Tricuspidalpositi- on eine eher ovale Form).
Fig. 12 zeigt ein besonders bevorzugt ausgestaltetes Ausführungsbeispiel des erfindungsgemäßen Klappenstents in einer schematischen Seitenansicht, der zur besseren Übersichtlichkeit ohne Herzklappe und Verankerungsfäden dargestellt ist.
Zur Verdeutlichung der Lage des Klappenstents aus Fig. 12 in situ zeigt Fig. 13 eine schematische, dorsale, intracardiale Ansicht eines in der Mitralposition fixierten Herzklappenstents nach der Erfindung. Beachte das gute Anschmiegen des Klappenstents an die linksatriale Umgebung. Abstände zwischen der linksatrialen Wand / Mitralannulus und dem Klappenstent werden so vermieden. Herzklappe und Verankerungsfaden zur Ventrikelspitze sind zur Vereinfachung der Darstellung weggelassen worden.

Claims

ANSPRÜCHE
1. Herzklappenstent (10) mit einem zur Aufnahme eines Herzklappenimplantats (30) eingerichteten Abschnitt und mit einer Mehrzahl von proximal angeordneten Verankerungselementen (20),
gekennzeichnet durch
eine Mehrzahl von Verankerungsfäden (40), die mit ihrem einen Ende am Stent (10) befestigt sind, und
einem die Verankerungsfäden (40) mit ihrem anderen Ende an der distalen Herz- kammerwandung unter Ausbildung einer Spannung zwischen der Herzkammerwandung und den proximal verankerten Verankerungselementen (20) befestigenden Widerlager (80).
2. Herzklappenstent (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Verankerungsfäden (40) an dem den Verankerungselementen (20) gegenüberliegenden Ende des Stentkörpers (30) befestigt sind.
3. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, gekennzeichnet durch wenigstens ein zur Längeneinstellung wenigstens eines Verankerungsfadens (40) eingerichtetes Fadenlängenstellelement (70).
4. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Widerlager (80) als Fadenlängenstellelement ausgebildet ist.
5. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, dadurch gekenn- zeichnet, dass das Herzklappenimplantat (30) eine Mitralklappe ist.
6. Herzklappenstent (10) nach Anspruch 4, dadurch gekennzeichnet, dass der Herzklappenstent (10) in der Ebene des Mitralklappenanrmlus im Wesentlichen oval oder U-förmig ausgebildet ist.
7. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Herzklappenstent (10) als Kegelstumpf ausgebildet ist.
8. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen dem Herzklappenimplantat (30) und dem Stent (10) eine Abdichtungsmembran angeordnet ist.
9. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen den Verankerungselementen (20) und dem Herzklappenimplantat (30) eine Abdichtungsmembran angeordnet ist.
10. Herzklappenstent (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens ein Verankerungselement (20) aus einer Formgedächtnislegierung besteht.
PCT/DE2008/001515 2007-09-13 2008-09-10 Herzklappenstent WO2009033469A1 (de)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US12/677,958 US20110004296A1 (en) 2007-09-13 2008-09-10 Heart Valve Stent
ES08801319.8T ES2445589T3 (es) 2007-09-13 2008-09-10 Estente de válvula cardiaca
EP08801319.8A EP2194925B1 (de) 2007-09-13 2008-09-10 Herzklappenstent
US13/275,751 US20120035703A1 (en) 2007-09-13 2011-10-18 Truncated Conical Heart Valve Stent with Anchoring Threads and Methods of Use
US13/275,683 US9095433B2 (en) 2007-09-13 2011-10-18 Truncated cone heart valve stent
US13/464,367 US20120283824A1 (en) 2007-09-13 2012-05-04 Heart Valve Stent
US14/465,437 US9078749B2 (en) 2007-09-13 2014-08-21 Truncated cone heart valve stent
US14/746,381 US9254192B2 (en) 2007-09-13 2015-06-22 Truncated cone heart valve stent
US15/018,473 US9730792B2 (en) 2007-09-13 2016-02-08 Truncated cone heart valve stent
US15/653,653 US10456248B2 (en) 2007-09-13 2017-07-19 Truncated cone heart valve stent
US16/565,564 US11213387B2 (en) 2007-09-13 2019-09-10 Truncated cone heart valve stent
US17/505,734 US20220039947A1 (en) 2007-09-13 2021-10-20 Truncated Cone Heart Valve Stent

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DE102007043830A DE102007043830A1 (de) 2007-09-13 2007-09-13 Herzklappenstent
DE102007043830.5 2007-09-13

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US13/275,683 Continuation US9095433B2 (en) 2007-09-13 2011-10-18 Truncated cone heart valve stent
US13/464,367 Continuation US20120283824A1 (en) 2007-09-13 2012-05-04 Heart Valve Stent

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US20110004296A1 (en) 2011-01-06
DE202008018459U1 (de) 2014-02-07
US20220039947A1 (en) 2022-02-10
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US9254192B2 (en) 2016-02-09
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DE202008018470U1 (de) 2014-02-27
US20120283824A1 (en) 2012-11-08
US10456248B2 (en) 2019-10-29
US20160151155A1 (en) 2016-06-02
US9078749B2 (en) 2015-07-14
US9095433B2 (en) 2015-08-04
US9730792B2 (en) 2017-08-15
US20170312076A1 (en) 2017-11-02
US11213387B2 (en) 2022-01-04
EP2194925B1 (de) 2013-11-06
EP2194925A1 (de) 2010-06-16
US20200000583A1 (en) 2020-01-02
DE202008018458U1 (de) 2014-02-28
US20120035713A1 (en) 2012-02-09
DE202008018461U1 (de) 2014-02-12
US20120035703A1 (en) 2012-02-09
US20140364944A1 (en) 2014-12-11
US20150305868A1 (en) 2015-10-29

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