Patent ID: 8721701
Filing Date: 2014-05-13
Classification: A61B

Abstract:
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; a 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; a collapsible reaction chamber located within said gripper, said chamber collapsing upon a reaction of at least a first reactant and a second reactant within an interior cavity of said chamber whereby the collapse of the chamber causes the gripping element to outwardly expand, releasing the protruding portion of the vascular occlusion device; the cavity of the collapsible chamber is defined by a polymeric proximal wall, a polymeric distal wall and a sidewall of the chamber, the distal wall being distal of the collapsible chamber and having a Durometer hardness higher than that of the proximal wall; said higher Durometer hardness distal wall provides a fulcrum which assists in the outward expansion of the gripping element when the reaction chamber collapses; and the first reactant is a substance that is in the gaseous phase and occupies a first volume, and the first and second reactants react to produce a product that is a second substance in the gas, liquid or solid phase, said product occupying a second volume that is less than the volume occupied by the first reactant to thereby effect the reaction chamber collapse and outward expansion of the gripping element to release the vascular occlusion device.