Anatomically approximate prosthetic mitral valve
First Claim
1. A prosthetic heart valve having a low outflow profile, comprising:
- a base structure having a central flow orifice oriented around a flow axis and having an outflow edge with alternating commissures and cusps, wherein the commissures define an outflow end of the valve;
a plurality of flexible leaflets mounted on the base structure and projecting into the flow orifice, the flexible leaflets being mounted in the base structure so as to define a leaflet axial dimension as measured approximately from an inflow end to the outflow end of the valve; and
a sewing ring having a scalloped inflow profile mounted around the base structure having a scalloped inflow edge and a planar outflow surface, the sewing ring defining a constant tissue attachment elevation at the planar outflow surface, wherein at the base structure commissures the distance between the attachment elevation and the valve outflow end relative to the leaflet axial dimension is less than about 75%, and wherein the sewing ring includes an inner wall and the base structure mounts within the inner wall.
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Accused Products
Abstract
An anatomically approximate prosthetic heart valve includes dissimilar flexible leaflets, dissimilar commissures and/or a non-circular flow orifice. The heart valve may be implanted in the mitral position and have one larger leaflet oriented along the anterior aspect so as to mimic the natural anterior leaflet. Two other smaller leaflets extend around the posterior aspect of the valve. A basic structure providing peripheral support for the leaflets includes two taller commissures on both sides of the larger leaflet, with a third, smaller commissure between the other two leaflets. The larger leaflet may be thicker and/or stronger than the other two leaflets. The base structure defines a flow orifice intended to simulate the shape of the mitral annulus during the systolic phase. For example, the flow orifice may be elliptical. A relatively wide sewing ring has a contoured inflow end and is attached to the base structure in such a way that the valve can be implanted in an intra-atrial position and the taller commissures do not extend too far into the left ventricle, therefore avoiding injury to the ventricle.
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Citations
20 Claims
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1. A prosthetic heart valve having a low outflow profile, comprising:
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a base structure having a central flow orifice oriented around a flow axis and having an outflow edge with alternating commissures and cusps, wherein the commissures define an outflow end of the valve; a plurality of flexible leaflets mounted on the base structure and projecting into the flow orifice, the flexible leaflets being mounted in the base structure so as to define a leaflet axial dimension as measured approximately from an inflow end to the outflow end of the valve; and a sewing ring having a scalloped inflow profile mounted around the base structure having a scalloped inflow edge and a planar outflow surface, the sewing ring defining a constant tissue attachment elevation at the planar outflow surface, wherein at the base structure commissures the distance between the attachment elevation and the valve outflow end relative to the leaflet axial dimension is less than about 75%, and wherein the sewing ring includes an inner wall and the base structure mounts within the inner wall. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A prosthetic heart valve having a low outflow profile, comprising:
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a base structure having a central flow orifice oriented around a flow axis partly defined by a stent having three arcuate cusps on an inflow end and three upstanding commissures on an outflow end, the stent being enclosed within a cloth covering defining an outwardly extending flange; a plurality of flexible leaflets mounted on the stent and projecting into the flow orifice, the flexible leaflets being mounted on the stent so as to define a leaflet axial dimension as measured approximately from the inflow end to the outflow end of the stent; and a sewing ring having a scalloped inflow profile and a planar outflow surface mounted around the base structure at an attachment elevation at the planar outflow surface of the sewing ring, wherein the sewing ring includes an inner wall defining three separated ledges descending downward from the outflow surface and intermittently provided around the inner wall, and wherein the stent cusps are located radially within the sewing ring inner wall and the flange of the cloth covering extends over the three ledges and attaches thereto. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification