Shape memory polymer foams for endovascular therapies

摘要

A system for occluding a physical anomaly. One embodiment comprises a shape memory material body wherein the shape memory material body fits within the physical anomaly occluding the physical anomaly. The shape memory material body has a primary shape for occluding the physical anomaly and a secondary shape for being positioned in the physical anomaly.

主权项

1. An apparatus comprising:
a delivery wire; a first shape memory polymer device coupled to the delivery wire, having a first state and a second state, said first shape memory polymer device composed of a polyurethane shape memory polymer foam with an open cell foam structure, said first shape memory polymer device adapted to be positioned in an interior of a physical anomaly; a second expandable device, said second expandable device coupled to the delivery wire, said second expandable device having a first collapsed state and a second expanded state to withdraw the shape memory polymer foam from the physical anomaly; and a detachment device adapted to detach the first shape memory polymer device from the delivery wire; said first shape memory polymer device and said second expandable device forming a shape memory material system to position the shape memory polymer foam in the interior of the physical anomaly and withdraw the shape memory polymer foam from the interior of the physical anomaly; wherein said delivery wire and said first shape memory polymer device are adapted to be located in the interior of the physical anomaly; wherein said first shape memory polymer device in said first state is adapted to be positioned in the interior of the physical anomaly; wherein said first shape memory polymer device is adapted to be expanded to the second state in the interior of the physical anomaly to conform to at least a portion of the physical anomaly to occlude the physical anomaly based on heat; and wherein said second expandable device is distal to said shape memory polymer foam in said first collapsed state and is adapted to be expanded and be in said second state to withdraw the shape memory polymer foam from the physical anomaly.