Shape memory polymer prosthetic medical device
A prosthetic medical device is formed by the combination of a biological tissue a shape memory polymer structure. The biological tissue provides an in-situ physiological function of the device. The shape memory polymer provides a capability for minimizing the device profile during insertion and then deploying after placement into a memory shape that achieves suitable mechanical structure and stability within an anatomical lumen or cavity. This configuration may be applied to form various prosthetic devices including aortic, mitral, and tricuspid valves in the heart; venous valves; anti-reflux valves for the lower esophageal sphincter; and other biological valve structures. Alternatively, an entirely non-biologic implementation using only shape memory polymer-based structures may be used as a prosthetic valve device.
1. A method for making a prosthetic venous valve medical device comprising
configuring a prosthetic body from a material comprising a shape memory polymer in a first, post-transition, coil form designed to fit snugly against a wall of an anatomical venous lumen, wherein the prosthetic body further comprises
an outer body defining an interior lumen; and
a plurality of valve flaps attached to the outer body within the interior lumen at multiple locations along a length of the coil form and arranged to resist retrograde fluid flow within the interior lumen; and
deforming the prosthetic body by elongating the coil form into a second, linear, pre-transition form that comprises a compact shape or profile relative to the first form for insertion into a delivery device for in vitro placement of the prosthetic medical device.
2. The method of claim 1 , wherein
the valve flaps comprise a biological tissue; and
the method further comprises affixing the biological tissue to the outer body within the lumen.
3. The method of claim 2 , wherein the affixing operation further comprises affixing the biological tissue to the shape memory polymer body with an adhesive.
4. The method of claim 2 , wherein the affixing operation further comprises polymerizing the shape memory polymer material around the biological tissue during the configuration operation.
5. The method of claim 2 , wherein the affixing operation further comprises mechanically fastening the biological tissue to the prosthetic body with a mechanical fastener.