Intravascular cuff
An intravascular cuff acts as a lining between a native vessel and an intravascular prosthetic device. During deployment, the ends of the cuff curl back upon themselves and are capable of trapping native tissue, such as valve leaflet tissue, between the ends. The cuff creates a seal between the vessel and the prosthetic, thereby preventing leakage around the prosthetic. The cuff also traps any embolic material dislodged from the vessel during expansion of the prosthetic.
1. An intravascular cuff for receiving a prosthetic, comprising:
at least one strand braided to form a tubular structure having an extended configuration and a deployed configuration;
whereby in the extended configuration, the tubular structure includes:
a first end and a second end;
a tubular body between the first end and the second end;
a lumen extending through the body;
whereby in the deployed configuration, the first and second ends assume an expanded shape relative to the tubular body; and
whereby upon deployment, an outer ply expands to conform against native tissue while an inner ply expands to a lesser extent than said outer ply to open said lumen through said body and form a gap between the outer ply and inner ply, said lumen sized to receive a delivery catheter and having funnel-shaped ends for guiding said delivery catheter.
2. The intravascular cuff for receiving a prosthetic of claim 1 wherein said lumen through said body has a uniform diameter in the deployed configuration.
3. The intravascular cuff for receiving a prosthetic of claim 2 wherein said at least one strand comprises Nitinol.
4. The intravascular cuff for receiving a prosthetic of claim 1 wherein said at least one strand comprises a super-elastic material.
5. The intravascular cuff for receiving a prosthetic of claim 1 whereby upon deployment, said first and second ends curl back on themselves.
6. The intravascular cuff for receiving a prosthetic of claim 1 wherein said tubular body between the first end and the second end comprises a two-ply body, formed by inverting said tubular body within itself.
7. The intravascular cuff for receiving a prosthetic of claim 6 further comprising a material sandwiched between plies of said two-ply body.
8. The intravascular cuff for receiving a prosthetic of claim 7 wherein said material is selected from the group consisting of non-woven material, woven material, braided fabric and polymer.
9. The intravascular cuff for receiving a prosthetic of claim 1 wherein the expanded shape of the ends comprises a mushroom shape defined by the outer ply and the inner ply separated by said gap.
10. The intravascular cuff for receiving a prosthetic of claim 9 wherein the inner ply forms a funnel in the deployed configuration.
11. The intravascular cuff for receiving a prosthetic of claim 1 wherein the tubular body between the first end and the second end retains a relatively unexpanded state in the deployed configuration.
12. The intravascular cuff for receiving a prosthetic of claim 1 wherein the tubular body shortens when assuming the deployed configuration.