Patent ID: 8206413

Claim:
A method for deployment of a vascular occlusion device at a preselected location within the vasculature of a patient, comprising: providing a deployment unit comprising a pusher member having a distal end opening and a chamber proximal thereof, the chamber having a flexible distal wall; disposing a removable vascular occlusion device having a protruding portion into the distal end opening of the lumen; using the deployment unit to place the vascular occlusion device at a preselected location within the vasculature of a patient; causing at least a first reactant and a second reactant to react within the chamber, said reactants producing a product which has a larger volume than the reactants; and whereby the expanding product expands the flexible distal wall, without otherwise expanding the chamber, toward the distal end opening to remove the protruding portion from the distal end opening of the lumen, thereby deploying the vascular occlusion device.