Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Heart valve – Having rigid or semirigid pivoting occluder
Patent
1994-01-14
1995-09-12
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Heart valve
Having rigid or semirigid pivoting occluder
623900, A61F 224
Patent
active
054493854
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a support for a heart valve prothesis.
The known prostheses used in cardiac surgery contain a crown-shaped support of plastic, but generally of metal or of both materials. They consist in general of long, often wire-like elements which are predominantly not very elastic and are often joined by soldering or welding. This results in poor adaptability, especially since the joints then become brittle, but in some cases also relatively poor tolerance, not least because the textile covering generally applied to the support then requires several seams in order to hold securely on the wire skeleton of the support. This causes strength problems and also causes manufacture to be made more difficult. Typical heart valve prostheses of this type are described in U.S. Pat. No. 3,570,014 or U.S. Pat. No. 3,755,823.
SUMMARY OF THE INVENTION
It is the object of the invention to design a support for a heart valve prosthesis of the type described above in such a way that the adaptability and tolerance are improved, strength problems being avoided. This is achieved according to the invention by providing a support of plastic material for the heart valve prothesis, the support having at one axial end, axially projecting support arms distributed over a circumference of the support and rounded at their free ends. A covering is provided over the support for fastening biological heart valve material. The support is formed as a single piece from flat, closed, preferably thermoplastic material that has an approximately hollow cylindrical or hollow conical shape.
The two-dimensional embodiment ensures both flexibility and adaptability, the one-piece embodiment making solder connections or the like superfluous, which is advantageous on the one hand for strength and durability and on the other hand for easier manufacture.
The elasticity and flexibility of the support arms is further improved by having the support wall thickness taper towards the free ends of the support arms. The provision of indentations between projections, permits the accommodation of excess biological heart valve material, which is fastened in a known manner to the support or to its textile covering. It is true that similar indentations were present-also in an embodiment according to U.S. Pat. No. 4,259,753, which attempted to overcome the previous disadvantages by avoiding long support arms, and of course with acceptance of the other disadvantages mentioned.
In particular, the embodiment, according to the invention, of the support provides such great adaptability that the heart valve prosthesis can be used equally, in the position of mitral or trichospidal valves.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details of the invention are evident from the following description of embodiments shown schematically in the drawing.
FIG. 1 shows a support according to the invention before attachment of the biological heart valve material and
FIG. 2 shows the developed view of a support formed according to the invention; and;
FIGS. 3 to 5a show various cross-sectional forms of the FIG. 2 support.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 shows a heart valve prosthesis 1 having an annular support la according to the invention in an oblique view with partly removed textile covering 3, which covers the annular support la together with a collar 2 mounted thereon. As can be seen, the support 1a consists of flat material, in particular of a thermoplastic, so that it can be produced easily and economically, for example by injection molding.
The support 1a possesses, in a known manner, three axially projecting support arms 4, the free ends of which are rounded in the manner to be described subsequently with reference to FIG. 2. Projections 5 and indentations 6 are arranged alternately at the axial end of the support 1a, opposite the support arms 4, in which indentations any excess biological heart valve material, which is to be flattened in conventional manner over the support arms and is to be fastened to-the
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Cichon Romuald
Krzyskow Marek
Religa Zbigniew
Stolarzewicz Bogdan
Stozek Jolanta
Fossum Laura
Isabella David
Nika Health Products Limited
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