Unitized three leaflet heart valve
First Claim
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1. An artificial heart valve comprising a semirigid polyurethane framework having three projecting symmetrical struts and being open axially therethrough;
- a polyurethane elastomeric membrane integral with said framework, attached to one end thereof to said struts and the contours of which comprise three leaflets, the leading edges of said three leaflets being reinforced with a narrow band of the same polyurethane elastomeric material which is integral therewith, the leading edges of said three leaflets also being capable of coming together to form a commissure line, said elastomeric membrane being joined to said framework along a tapered transition area of said framework, said elastomeric membrane also having reinforcing lines of greater thickness then said elastomeric membrane and projecting from the boundary of said framework/elastomeric material transition boundary; and
a polyurethane suture base, integral with said framework at the end of said framework opposite from said elastomeric membrane, for attaching the valve to the tissues of the heart.
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Abstract
A polyurethane heart valve has a semirigid frame composed of a base ring and three struts, and an elastomeric membrane integral and unitary with the frame, the contours of which make up three leaflets of the valve. The leading edges of the leaflets which form the commissure line are reinforced with a narrow elastomer band. The leaflets are further reinforced by radiating lines projected from the frame into the leaflet and which simulate collagen formation in natural leaflets. In addition, the transition between the frame and the leaflets is tapered.
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Citations
5 Claims
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1. An artificial heart valve comprising a semirigid polyurethane framework having three projecting symmetrical struts and being open axially therethrough;
a polyurethane elastomeric membrane integral with said framework, attached to one end thereof to said struts and the contours of which comprise three leaflets, the leading edges of said three leaflets being reinforced with a narrow band of the same polyurethane elastomeric material which is integral therewith, the leading edges of said three leaflets also being capable of coming together to form a commissure line, said elastomeric membrane being joined to said framework along a tapered transition area of said framework, said elastomeric membrane also having reinforcing lines of greater thickness then said elastomeric membrane and projecting from the boundary of said framework/elastomeric material transition boundary; and
a polyurethane suture base, integral with said framework at the end of said framework opposite from said elastomeric membrane, for attaching the valve to the tissues of the heart.- View Dependent Claims (2, 3, 4, 5)
Specification
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Current AssigneeUnited States of America As Represented By The Secretary of The Department of Health Education and Welfare
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Original AssigneeUnited States of America As Represented By The Secretary of The Department of Health Education and Welfare
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InventorsBoretos, John W., Iriguchi, Norio
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Primary Examiner(s)Frinks, Ronald L.
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Application NumberUS05/969,571Time in Patent Office642 DaysField of Search3/1.5, 137/844, 137/849US Class Current623/2.19CPC Class CodesA61F 2/2412 with soft flexible valve me...F16K 15/147 the closure elements having...F16K 15/1471 slits arranged along multip...Y10S 623/90 Stent for heart valveY10T 137/7885 Multiple slit
