Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Heart valve – Having rigid or semirigid pivoting occluder
Patent
1989-02-24
1990-09-18
Frinks, Ronald
Prosthesis (i.e., artificial body members), parts thereof, or ai
Heart valve
Having rigid or semirigid pivoting occluder
A61F 224
Patent
active
049575031
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The invention relates to the medicine, and more specifically, it deals with cardiosurgery, and in particular, with a heart valve prosthesis designed for implantation to replace an affected natural heart valve.
STATE OF THE ART
In recent years so called poppet heart valve prostheses have come into a widespread use which comprise a valve ring or body having an opening for the flow of blood and a valve poppet mounted therein and designed for closing and opening the ring opening during operation of the valve. The poppet is floatingly mounted by means of upper and lower support structures which are essentially poppet motion limiters and hereinafter referred to as support structures. The poppet of such a valve has an upper or distal side and a lower or proximal side, the former being concave and having a depression for the upper support structure and the latter being shaped to fit configuration of the lower support structure, e.g. as shown in U.S. Pat. No. 4,057,857 to Fettel et al., or in U.S. Pat. No. 4,713,071 to Iotis et al.
Such valves have a certain advantage, e.g. they ensure a surface-to-surface contact of the poppet in the closed position with the support structures the latter reference, namely U.S. Pat. No. 4,713,071 teaching the provision of the surface-to-surface contact in both, open and closed positions of the valve poppet. At the same time, this type of the heart valve prosthesis features a rather massive poppet due to the fact that the distal side of the valve poppet is made convex whereby the volume, and, consequently the mass of the poppet increases. This circumstance, in turn, results in impared conditions for rehabilitation of a patient during postoperation period and hampers angular rotation of the poppet.
DISCLOSURE OF THE INVENTION
A problem now resides in the poppet of a heart valve prosthesis which is so constructed as to reduce its mass, thereby facilitating the angular rotation of the poppet, prolonging its service life and enhancing reliability of the valve in operation, whereby the rehabilitation conditions of a patient are also improved.
This technical problem is solved by that in a heart valve prosthesis comprising a valve ring having an opening for the flow of blood to pass and a valve poppet floatingly mounted in this opening and having a distal side and a proximal side engageable with support structures, according to the invention, the distal side has an annular concave portion which is located between the middle part of the distal side and the periphery of the poppet and which is smoothly conjugated with this periphery along the whole circumference of the poppet.
The provision of the concave portion makes it possible to achieve a substantial reduction of the poppet mass which is especially important upon a substantial deterioration of the cardiac muscle function. Although the angular motion in this case is ensured similarly to the prior art construction owing to a special design of the support structures, the reduction of the poppet mass enhances this angular motion because the lower the mass of the poppet, the better the conditions for its angular motion.
One embodiment of the invention envisages that the concave portion of the distal side and the proximal side have the same radius of curvature. This facilitates best hemodynamic conditions of the flow of blood in the opening of the valve ring.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to specific embodiments which are given as non-limiting examples and which are illustrated in the accompanying drawings, in which:
FIG. 1 is a perspective view, partially in section of a heart valve prosthesis illustrating one embodiment of the invention;
FIG. 2 a partial sectional view of a valve poppet of FIG. 1.
PREFERRED EMBODIMENT OF THE INVENTION
With reference, first, to FIG. 1, where the construction of a heart valve prosthesis according to the invention is best shown, the heart valve prosthesis comprises a valve ring or body 1 in the form of a cylinder with shoulder
REFERENCES:
patent: 4423525 (1984-01-01), Vallana et al.
patent: 4713071 (1987-12-01), Iofis et al.
patent: 4863466 (1989-09-01), Schlegel
Agafonov Andrei V.
Bukatov Alexandr S.
Dobrova Natalya B.
Egorov Jury G.
Iofis Naum A.
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