Shape memory polymers

A crosslinked thermoset shape memory polyurethane polymer medical device comprising:

• a crosslinked thermoset polyurethane polymer comprising a covalently bonded network structure and a reaction product of an aliphatic diisocyanate monomer reacted with at least one symmetric hydroxyl containing monomer;
• wherein said polymer has shape memory behavior and is formed into a permanent primary shape, re-formed into a stable secondary shape, and is configured to be controllably actuated to recover said permanent primary shape;
• wherein the diisocyanate monomer and the at least one symmetric hydroxyl containing monomer are formulated to a 1:1 ratio of isocyanate to hydroxyl functional groups;
• wherein the at least one symmetric hydroxyl containing monomer includes at least one of N,N,N′,N′-tetrakis (2-hydroxypropyl) ethylenediamine (HPED) and triethanol amine (TEA);
• wherein the polymer has a Young's modulus in a range of 1 to 100 MPa at a temperature above a glass transition temperature of the polymer.