US4416028A — Blood vessel prosthesis

Claim 1

Independent Claim 115 words

A blood vessel prosthesis comprising a tubular support member of an at least partially non-resorbable material without adverse tissue reaction, and at least one inner wall member of a resorbable material without adverse tissue reaction supported by said tubular member and forming a substantially concentric inner wall structure thereto, said inner wall structure being sufficiently porous to permit the passage of blood cells, such as erythrocytes and thrombocytes, through the free inner surface and into at least a substantial part of the thickness thereof, thereby providing a support inside said tubular support member for the formation of a layer of thrombotic material whereby an endothelium coated muscle layer is formed on said tubular support member.

Claim 2

Dependent Claim 115 words

A blood vessel prosthesis comprising a tubular support member of an at least partially non-resorbable material without adverse tissue reaction, and at least one inner wall member of a resorbable material without adverse tissue reaction supported by said tubular member and forming a substantially concentric inner wall structure thereto, said inner wall structure being sufficiently porous to permit the passage of blood cells, such as erythrocytes and thrombocytes, through the free inner surface and into at least a substantial part of the thickness thereof, thereby providing a support inside said tubular support member for the formation of a layer of thrombotic material whereby an endothelium coated muscle layer is formed on said tubular support member.

Claim 3

Dependent Claim 46 words

A blood vessel prosthesis as claimed in claim 1, wherein said at least one inner wall member at least partially is spaced apart from said tubular member, thereby defining interspaces between the tubular member and said inner wall member, into which interspaces blood cells can pass.

Claim 4

Dependent Claim 23 words

A blood vessel prosthesis as claimed in claim 2, wherein the distances between the material surfaces in said interspaces amount to 10μ-5 mm.

Claim 5

Dependent Claim 26 words

A blood vessel prosthesis as claimed in claim 1, wherein said at least one inner wall member comprises at least one layer of a porous material.

Claim 6

Dependent Claim 25 words

A blood vessel prosthesis as claimed in claim 1, wherein said at least one inner wall member comprises at least one tube of net material.

Claim 7

Dependent Claim 34 words

A blood vessel prosthesis as claimed in claim 1, wherein the resorbable material is selected from the group consisting of polyglycolic acid, copolymers of glycolic acid and lactic acid, and lactide polymers and copolymers.

Claim 8

Dependent Claim 16 words

A blood vessel prosthesis as claimed in claim 1, wherein said tubular support member is porous.

Claim 9

Dependent Claim 17 words

A blood vessel prosthesis as claimed in claim 6, wherein said tubular member is woven or knitted.

Claim 10

Dependent Claim 29 words

A blood vessel prosthesis as claimed in claim 1, wherein the material of said tubular member is selected from the group consisting of polyethylene terephthalates, polytetrafluoroethane, polyethane and polypropene.

Claim 11

Independent Claim 130 words

A method of replacing blood vessels or parts thereof, comprising the step of implanting a blood vessel prosthesis, comprising a tubular support member of an at least partially non-resorbable material without adverse tissue reaction, and at least one inner wall member of a resorbable material without adverse tissue reaction supported by said tubular member and forming a substantially concentric inner wall structure thereto, said inner wall structure being sufficiently porous to permit the passage of blood cells, such as erythrocytes and thrombocytes, through the free inner surface and into at least a substantial part of the thickness thereof, thereby providing a resorbable support inside said tubular support member for the formation of a layer of thrombotic material whereby an endothelium coated muscle layer is formed on said tubular support member.

Claim 12

Independent Claim 130 words

A method of replacing blood vessels or parts thereof, comprising the step of implanting a blood vessel prosthesis, comprising a tubular support member of an at least partially non-resorbable material without adverse tissue reaction, and at least one inner wall member of a resorbable material without adverse tissue reaction supported by said tubular member and forming a substantially concentric inner wall structure thereto, said inner wall structure being sufficiently porous to permit the passage of blood cells, such as erythrocytes and thrombocytes, through the free inner surface and into at least a substantial part of the thickness thereof, thereby providing a resorbable support inside said tubular support member for the formation of a layer of thrombotic material whereby an endothelium coated muscle layer is formed on said tubular support member.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-11-21	1987-05-23	1987-11-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-11-21	1991-05-23	1991-11-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-11-21	1995-05-23	1995-11-22	$7700.00	Window Closed / Lapsed

Blood vessel prosthesis

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