Tissue separation apparatus and method
A tissue separation apparatus is disclosed. The apparatus can have a separating member that has a contracted state and an expanded state. When the separating member is placed between first and second tissue layers, the separating member can part the first tissue layer from the second tissue layer. The separating member can be moved into the contracted state to sever the first tissue layer. Methods of making and using the prosthesis are also disclosed.
1 . An apparatus for separating tissue layers, the apparatus comprising:
a shaft comprising a first end, a second end and a longitudinal axis, and a first separating member at a first length along the longitudinal axis and a first angle from the longitudinal axis,
wherein the first separating member has a contracted state and an expanded state, means for facilitating passage of the shaft between first and second tissue layers, and
the shaft and the first separating member being placeable between the first tissue layer and the second tissue layer, whereby the first separating member parts the first tissue layer from the second tissue layer in the expanded state and severs the first tissue layer in the contracted state.
2 . The apparatus of claim 1 , wherein the first separating member comprises a diameter from the longitudinal axis of the shaft, and wherein the diameter varies during use of the apparatus.
3 . The apparatus of claim 2 , wherein the diameter during the expanded state is a first diameter, and wherein the diameter during the contracted state is a second diameter, and wherein the first diameter is greater than the second diameter.
4 . The apparatus of claim 1 , wherein the first separating member in the expanded state forms a substantially helical shape.
5 . The apparatus of claim 1 , wherein the first separating member in the contracted state forms a substantially helical shape.
6 . The apparatus of claim 1 , wherein the first separating member in the expanded state forms a substantially parabolic shape.
7 . The apparatus of claim 1 , wherein the first separating member in the expanded state forms a curved multi-parabolic shape.
8 . The apparatus of claim 1 , wherein the first separating member comprises a wire.
9 . The apparatus of claim 1 , further comprising a garotte.
10 . The apparatus of claim 1 , wherein the first end of the shaft comprises a tip.
11 . The apparatus of claim 1 , wherein the tip comprises a widened section.
12 . The apparatus of claim 1 , wherein the tip comprises a guide eye.
13 . The apparatus of claim 1 , wherein the first separating member is configured to actively expand and contract.
14 . The apparatus of claim 1 , wherein the first separating member is configured to passively expand and contract.
15 . The apparatus of claim 1 , further comprising a second separating member at a second length along the longitudinal axis and a second angle from the longitudinal axis.
16 . The apparatus of claim 15 , wherein the first length is the same as the second length.
17 . The apparatus of claim 15 , wherein the first angle is the same as the second angle.
18 . The apparatus of claim 15 , wherein the first length is greater than the second length.
19 . The apparatus of claim 15 , wherein the first angle is greater than the second angle.
20 . The apparatus of claim 1 , wherein the facilitating means comprises a tissue layer separating tip at the first end of the shaft.
21 . The apparatus of claim 1 , wherein the facilitating means comprises:
a guide wire channel extending along the shaft; and
a guide wire slidably located within the guide wire channel.
22 . The apparatus of claim 1 , wherein the facilitating means comprises a seating recess in the shaft for receipt of the first separating member when the first separating member is in the contracted state.
23 . The apparatus of claim 1 , wherein the first separating member extends from the shaft at first and second locations along the shaft, said the first and second locations being separated by the same distance when the first separating member is in the expanded state and when in the contracted state.
24 . A vascular layer separating apparatus comprising:
a shaft having proximal and distal portions, the distal portion having a vascular layer separating tip; and
a separating member at the distal portion movable between a contracted state, positioned along these shaft, and an expanded state, positioned spaced apart from the shaft, the separating member extending along a generally helical, vascular layer separating path when in the expanded state.