Suture rings for rotatable artificial heart valves
AssigneeEdwards Lifesciences Corporation
InventorsRobert Stobie, George Guo
Life of this patent
Estimating the term…
Abstract
A suture ring for a rotatable artificial heart valve apparatus has a ring member covered by a fabric material. A portion of the fabric material covers a portion of the inner surface of the ring member. At least one protuberance is formed on the inner surface of the ring member so as to mitigate the frictional resistance to rotation which results from compression of the fabric between the suture ring and the heart valve. Thus, desirable rotation of the heart valve relative to the suture ring is assured over a range of thicknesses of the fabric material.
Claims14
An artificial heart valve having a controlled resistance to torque, comprising:
- an annular valve body having opposite longitudinal ends, a blood flow passageway therethrough, and an outer surface;
- a suture ring mounted on the outer surface of the valve body to be relatively rotatable therewith, the suture ring including an inner surface, an outer surface, a proximal edge, and a distal edge;
- a needle-penetrable sheet being interposed between the inner surface of the suture ring and the outer surface of the valve, the sheet having a thickness;
- and
- at least one protuberance formed on either the outer surface of the valve body or the inner surface of the suture ring for compressing the sheet therebetween, a majority of the sheet interposed between the inner surface of the suture ring and the outer surface of the valve otherwise being uncompressed, the protuberance having a height forming a gap between the inner surface of the suture ring and the outer surface of the valve body, the height of the protuberance and thus the size of the gap being dependent on the thickness of the sheet so that the torque required to rotate the valve body with respect to the suture ring is maintained within a range having a minimum above that at which the valve body would freely rotate within the suture ring and a maximum below that which would require excessive force to turn the valve body within the suture ring.
An artificial heart valve having a controlled resistance to torque, comprising:
- an annular valve body having opposite longitudinal ends, a blood flow passageway therethrough, and a rigid outer surface;
- a suture ring mounted on the outer surface of the valve body to be relatively rotatable therewith, the suture ring including a generally rigid inner surface, an outer surface, a proximal edge, and a distal edge;
- a needle-penetrable sheet being interposed between the inner surface of the suture ring and the outer surface of the valve body, the sheet having a longitudinal dimension extending between the inner surface of the suture ring and the outer surface of the valve body, the sheet being compressed within a gap formed between the generally rigid inner surface of the suture ring and the rigid outer surface of the valve body to substantially determine the torque required to rotate the valve body with respect to the suture ring, the sheet extending into voids along most of its longitudinal dimension, the voids defined intermediate the inner surface of the suture ring and the outer surface of the valve body, and the sheet not being compressed in the voids so that the torque required to rotate the valve body with respect to the suture ring is maintained within a range having a minimum above that at which the valve body would freely rotate within the suture ring and a maximum below that which would require excessive force to turn the valve body within the suture ring.
Dependencies are inferred from the claim text.