Shape memory polymers
First Claim
1. 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.
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Accused Products
Abstract
New shape memory polymer compositions, methods for synthesizing new shape memory polymers, and apparatus comprising an actuator and a shape memory polymer wherein the shape memory polymer comprises at least a portion of the actuator. A shape memory polymer comprising a polymer composition which physically forms a network structure wherein the polymer composition has shape-memory behavior and can be formed into a permanent primary shape, re-formed into a stable secondary shape, and controllably actuated to recover the permanent primary shape. Polymers have optimal aliphatic network structures due to minimization of dangling chains by using monomers that are symmetrical and that have matching amine and hydroxyl groups providing polymers and polymer foams with clarity, tight (narrow temperature range) single transitions, and high shape recovery and recovery force that are especially useful for implanting in the human body.
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Citations
13 Claims
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1. A crosslinked thermoset shape memory polyurethane polymer medical device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification