Shape memory polymer medical device

Abstract

Methods and apparatus described herein may utilize activation of an SMP material to install medical devices with respect to a surgical site. Activation of the SMP material may be performed with the use of a triggering force and/or a constraint applied to the SMP material. Activation using a triggering force and/or a constraint may be used to create varied activation rates in an SMP material and varying speeds and times of activation to occur in shape memory polymers in devices. The disclosure also describes devices using wedge elements for activation of shape memory response in the SMP material.

What is claimed is: 
     
         1 . A medical device comprising:
 a shape memory polymer portion that has been set with a stored strain between a temporary shape and a memorized shape, wherein the stored strain is adapted to be stored in the shape memory polymer portion by the shape memory polymer portion being at a temperature below an activation temperature of the shape memory polymer portion; and   an activation triggering element adapted to apply a physical force to the shape memory polymer portion in an opposing direction to the stored strain while the shape memory polymer portion is below the activation temperature;   wherein the activation triggering element is further adapted to complete recovery of the stored strain in the shape memory portion via applying the physical force to the shape memory polymer portion while the shape memory polymer portion is below the activation temperature.   
     
     
         2 . The medical device of  claim 1 , wherein the activation triggering element is further adapted to vary a magnitude of the physical force applied to the shape memory polymer portion during recovery of the stored strain. 
     
     
         3 . The medical device of  claim 1 , wherein the activation triggering element is further adapted to vary a direction of the physical force applied to the shape memory polymer portion during recovery of the stored strain. 
     
     
         4 . The medical device of  claim 1 , further comprising:
 a recovery-control mechanism adapted to apply a plurality of discreet levels of physical constraint via the activation triggering element during recovery of the stored strain below the activation temperature.   
     
     
         5 . The medical device of  claim 1 , further comprising:
 a recovery-control mechanism adapted to apply a continuously-variable level of physical constraint via the activation triggering element during recovery of the stored strain below the activation temperature.   
     
     
         6 . The medical device of  claim 1 , wherein the activation triggering element is connected to the shape memory polymer portion via a connection that is adapted to be broken during insertion into a surgical site, thereby dislodging the activation triggering element from the shape memory polymer portion.