Device for regulating blood flow
An elongated frame dimensioned and configured for implantation in a blood vessel. The frame has two axially spaced apart ring portions, which may be in the form of an expandable crown or a similar structure. At least one linking member connects the two ring portions to one another to form an integral structure. A valve membrane is supported between the axially spaced apart ring portions of the frame. The valve membrane is adapted and configured for movement between a first position in which blood flow through the frame is permitted and a second position in which blood flow through the frame is inhibited.
1 . An implantable device for regulating blood flow through a blood vessel, comprising:
a) an elongated frame dimensioned and configured to be implanted in a blood vessel, the frame including axially spaced apart ring portions, and at least one linking member connecting the axially spaced apart ring portions to one another; and
b) a valve membrane supported between the axially spaced apart ring portions of the frame and adapted for movement between a first position in which blood flow through the frame is permitted and a second position in which blood flow through the frame is inhibited.
2 . An implantable device as recited in claim 1 , wherein the frame includes a plurality of peripherally spaced apart linking members.
3 . An implantable device as recited in claim 1 , wherein the frame is formed at least in part from a shape memory alloy material.
4 . An implantable device as recited in claim 1 , wherein the valve membrane is formed at least in part from PTFE.
5 . An implantable device as recited in claim 1 , wherein the valve membrane is coated at least in part with an anti-clotting agent.
6 . An implantable device for regulating blood flow through a blood vessel, comprising:
a) an elongated frame dimensioned and configured to be implanted in a blood vessel, the frame including first and second axially spaced apart frame portions; and
b) a valve membrane supported between the axially spaced apart frame portions and adapted for movement between a first position in which blood flow through the frame is permitted and a second position in which blood flow through the frame is inhibited, the membrane including a first body portion and a second narrower neck portion, the first body portion attached to the first frame portion and the second neck portion attached to the second frame portion.
7 . The implantable device of claim 6 , wherein the narrower neck portion has a length at least equal to the radius of the second frame portion.
8 . The implantable device of claim 6 , wherein the first and second frame portions are joined by a linking member, the linking member extending from opposing sides of the frame portions.
9 . The implantable device of claim 6 , wherein the first and second frame portions are joined by a curved linking member.
10 . The implantable device of claim 6 , wherein the first and second frame portions each comprise ring-like members.
11 . The implantable device of claim 10 , wherein each of the rings has a wavy configuration.
12 . The implantable device of claim 6 , wherein the body portion and the neck portion of the membrane are attached to their respective frame portions approximately 180 degrees apart.
13 . An implantable device for regulating blood flow through a blood vessel, comprising:
a) an elongated frame dimensioned and configured to be implanted in a blood vessel, the frame including first and second axially spaced apart frame portions; and
b) a valve membrane supported between the axially spaced apart frame portions and adapted for movement between a first position in which blood flow through the frame is permitted and a second position in which blood flow through the frame is inhibited, the membrane having a curved surface, the membrane further having first and second attachment regions attached to the first frame portion and a third attachment region attached to the second frame portion.
14 . The implantable device of claim 13 , wherein the first frame portion and second frame portion are positioned at an angle to the longitudinal axis of the vessel.
15 . The implantable device of claim 13 , wherein the frame includes a linking member joining the first and second frame portions.
16 . The implantable device of claim 15 , wherein the first frame portion is positioned at an angle to the linking member.
17 . The implantable device of claim 16 , wherein the second frame portion is positioned at an angle to the linking member, both the first and second frame portion angles being obtuse angles.