Chemically based vascular occlusion device deployment
View Patent ↗A vascular occlusion device deployment system for placing an occlusion device at a preselected site within the vasculature of a patient. The deployment system employing a pusher having a lumen with an opening at the distal end of the pusher. A vascular occlusion device is connected to the distal end of the pusher by a portion that is removeably disposed within the opening. The portion of the occlusion device is forced out of the opening by an expandable reaction chamber, thereby deploying the occlusion device. The expandable reaction chamber, prior to deployment, has multiple chambers separated by a heat-dissolvable membrane. When the membrane is dissolved, components from the chambers react and expand, leading to deployment.
1. A vascular occlusion device deployment system, comprising:
a vascular occlusion device having a protruding portion;
a deployment unit comprising a pusher having a proximal end portion and a distal end portion;
an expandable gripper located at the distal end portion of the pusher, said gripper including an outwardly expandable gripping element for gripping the protruding portion of the vascular occlusion device;
an expandable reaction chamber located at least partially within said gripper, said chamber including a first sub-chamber and a second sub-chamber separated by a heat dissolvable membrane;
a first reactant housed within the first sub-chamber and a second reactant housed within the second sub-chamber, said reaction chamber expanding when said first and second reactants react;
a heat generating system that is capable of dissolving the heat dissolving membrane, allowing the first and second reactants to react; and
whereby the expansion of the chamber causes the gripper to outwardly expand, releasing the protruding portion of the vascular occlusion device.
2. The deployment system of claim 1 , wherein the expandable reaction chamber comprises a polymeric material.
3. The deployment system of claim 1 , wherein the gripping elements comprise a plurality of jaws.
4. The deployment system of claim 1 , wherein the first reactant comprises a mixture of cyanoacrylate monomer and ethanol, and the second reactant comprises a mixture of ethanol and N,N-Dimethyl-p-toluidine.
5. The deployment system of claim 1 , wherein the first and second reactants produce a polycyanoacrylate foam when mixed together.
6. The deployment system of claim 1 , wherein the heat generating system comprises an electrical resistance heating coil connected to a power source via lead wires.