DE2259716A1 - CLOSING LINK FOR A HEART VALVE - Google Patents

Description

PATENT LAWYERS

dr. W.Schalk dipl.-ing. P. Wirth ■ dipl.-ing.G. Dannenberg

DR. V. SCHMIED-KOWARZIK · DR. P. WEINHOLD · DR. D. GUDEL

6 FRANKFURT AM MAIN CR. ESCHENHEIMER STRASSE 39

US Ser. No. 205.852

Dec. 1, 1972
PW / Ar

Baxter Laboratories, Inc. Morton Grove, Illinois 60053 UNITED STATES .

Closing member for a heart valve

Valves that can be built into a heart are types with and occluder type heart valves are known, and such valves are used by many surgeons routinely implanted as a replacement for defective natural heart valves or for so-called heart valves. . ·

It is true that locking elements made of plastic are for heart valves and locking elements made of hard materials are e.g., fasteners made from isotropic pyrolytic carbon (see U.S.A. Patent No. 3,526,005) for Cardiac valves known; however, each of these types of fastener links has its own particular disadvantages.

Plastic fastener elements produced may tend to wear at their edges, because their edges or edges when they go ^v and forth, rubbing between the open and the closed position act on the struts of the cage or other device that serves , they in their place

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ment. Although now show from pyrolytic carbon manufactured valve closure members much less wear on the edges, but generate excessive noise and knocks, when they hit the outer part of the cage, and after moving from the closed position to the open position the valve mouth or valve opening have reached a rest position. The noise that occurs is even then audible when the valve is already implanted; the repetitive hitting of the locking link itself can cause that in the rigid and fragile pyrolytic carbon material ! Cracks or cracks occur or chips break out, which has potentially catastrophic consequences.

According to the invention, a heart valve is now created at which the drawbacks of both types of heart valve closures or closure members are remedied and in which a valve closure member of long service life or service life is created, in which excessive noises and impacts are not are generated when the closure member strikes against the top of the valve cage.

A preferred embodiment of the invention will now be described, for example, with reference to the drawings demonstrate:.

Fig. 1 is a perspective view of a typical, with closure plate working heart valve, in which a closure plate according to the invention is used, in the open position;

Figure 2 is a side view of the Pig valve. 1;

Fig. 3 'is a side view of the Pig valve. 1 and 2, where

however, the closure disc is shown in a vertical • section;

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4 shows a plan view of the valve closure plate according to the invention, where "for parts of the associated plastic material Are shown crawled away to the associated ring made of hard, wear-resistant material show, which is embedded in the plate, and

Pig. 5 is a plan view of the ring made of hard, wear-resistant material which is used in the valve plate according to the invention.

Pig. 1 shows a typical heart valve 10 in which a Closure plate 12 can be used. A valve ring 14 delimits the valve passage opening or forms the this opening containing valve seat, against which the closure plate rests resting in the closed position, to the in the Open position to block blood flow. In the embodiment shown, the valve ring 14 can be sewn and stitched in fabric. Instead, other embodiments of the heart valve ring can be used in conjunction with the closure member according to the invention can be used, e.g. a multi-part valve seat ring, which has a mouthpiece made of pyrolytic Carbon forms and at least on the outer circumference into a sewable or sewn fabric or textile fabric (fabric for. suturing). As a holder for the plate 12 are in a ^ ypi see execution with pyrolytic carbon or the like coated titanium made struts 16 are provided, which are formed and arranged such that they Hold the plate 12 in a position in which it is between one in Pig. 1 open position and a closed position towards and is movable, in which the latter the plate 12 rests against the seat ring 14 and its opening 18 against flow passage blocked.

According to the invention the plate 12 has an extending over its entire circumference peripheral part 20 consisting of ¹ Hard, verschMssfestem material consists, for example, isotropic pyrolytic

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Carbon, titanium or the like. Seen from the outside, the rest of the plate 12 consists of a softer plastic material, e.g. polyethylene with an extremely high molecular weight (e.g. 1 to 3 million), polypropylene or polycarbonate synthetic resin. If now the peripheral part 20 of the plate 12 rubbing against the vertical parts 22 of the struts 16 when opening and closing of the valve is applied, there is only very little edge wear compared to a plate made entirely of plastic on. However, if the plate 12 strikes against the horizontal parts 24 of the struts 16 at the end of the opening process, thus reduces the existing low flexibility of the Kunstsfoffmaterials of the plate 12 both the occurrence of noise and the impact effect when the disc is in the open position is brought to a stop.

In Figures 3 to 5 it can be seen that the peripheral part forms the outer periphery of a rigid ring 26, which runs along the entire circumference of the plate 12 made of a plastic part 15 protrudes. The ring 26 has a relatively large central opening 28 and a plurality of smaller openings 30, which are arranged at a radial distance from the central opening.

In its typical design, the valve plate is the same Invention produced in that a malleable plastic forming part 15 is pressed around ring 26 in such a way that that the molten plastic comes into intimate contact with the entire surface of the ring 26 and through the openings 28 and 30 from each side to fuse with the plastic of the other side. To this Ring 26 is firmly and intimately connected to the plastic so that any shrinkage of the plastic after molding does not lead to the ring 26 becoming detached from it or receiving any play relative to the plastic 15.

3 0 9 8 2 S / 0 3 3 6 ° ^RIGINAL «« «TED

The inventive concept of the above embodiment can also be applied to closure members other than valve plates or valve disks. For example, according to the invention, a cone,
Ring, pipe or poppet valve or such a thing. Valve member, which is made of plastic and placed in a cage, contain a ring similar to the ring 26, the circumference of which protrudes beyond said valve cone, valve ring, valve disc or the like along the line at which most of the sliding frictional contact between the valve member and ^s occurs in the cage.

Thus, the scope of the invention is as evident from the
The following claims results, not to those described above for illustration purposes only and in the drawing
shown, embodiment limited.

ORIGINAL INSPECTED

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Claims (1)

Baxter Laboratories, Inc. Ser.No. 205.852 Dec. 4, 1972 Claims λ j closure member, for or for installation in a heart valve, preferably with reciprocating movement of the closure member parallel to itself between its open position outside and its closed position within the central flow opening of a valve seat ring, characterized in that the closure member (12) is provided with an annular part (20 or 26) made of hard, wear-resistant Yierkstoff, which is embedded in a molded mass (15) made of plastic and whose outer peripheral or edge part (20) along the entire outer circumference of 'Gh dBS' Closing link protrudes from the plastic embedding compound. 2. Closure member for a heart valve according to claim 1, characterized in that the ring (26) made of hard, wear-resistant Material has a central opening (28) and a plurality of smaller openings (50) which are radially spaced from the central opening. 3. Closure member according to claim 1 or 2, characterized in that that the closure member has the jiOrm of a plate or disc and the annular part (26) embedded in the plastic compound (15) along the entire outer circumference of the plate or disc protrudes over the plastic embedding. 4. Closure member according to one of claims 1 to 3 »thereby characterized in that the hard ring-shaped part (26) at least at the edge (20) consists of isotropic, pyrolytic carbon. 309825 / 0-3 36 5. Closure member according to one of claims 1 to 4, characterized in that the embedding compound (15) consists of a Plastic with an extraordinarily high molecular weight. 6. Closure member according to claim 5 »characterized in that the embedding material (15) made of polyethylene with extraordinary high molecular weight. 7. Closure member according to claim 5, characterized in that the embedding compound (15) made of polypropylene with extraordinary high molecular weight. 8. Closure member according to claim 5> characterized in that the embedding compound (15) consists of polycarbonate plastic with an extremely high Itolecular weight. 9. Closure member according to one of claims 1 to 8, characterized in that that it is designed as a flat member (12 ^, whose circumferential part protruding over the entire circumference (20) during its opening and closing movement in sliding contact with parts of the seat ring (14) or from this protruding lead parts (16). The patent attorney :, ''-'ir ORIGINAL INSPECTED 309825/0336 Blank page