Catheter based retrieval device with proximal body having axial freedom of movement

A medical device for removing an occlusion from a vessel, comprising:

• a delivery catheter and a delivery wire,
• said delivery catheter comprising an internal lumen that extends through said delivery catheter, said internal lumen of said delivery catheter adapted to receive said delivery wire therein,
• said delivery wire comprising a distal end region, said delivery wire disposed in said internal lumen of said delivery catheter,
• said delivery wire further comprising a first body releasably engaged to said delivery wire at a first position on said delivery wire, said releasable engagement of said first body to said delivery wire comprising a breakable mechanical connection of said first body to said delivery wire, said breakable mechanical connection comprising a threshold holding force,
• said first body adapted to expand from a first compressed configuration to a first expanded configuration,
• said delivery wire further comprising a second body fixed to said delivery wire at a second position on said delivery wire, said second position comprising a position proximate said distal end region of said delivery wire and, thereby distal from said first position of said first body, said second body adapted to expand from a second compressed configuration to a second expanded configuration,
• said first body further adapted to disengage from said delivery wire and slidably translate along said delivery wire in a distal direction toward said second body when said delivery catheter is translated in a distal direction relative to said delivery wire, said delivery catheter contacts said first body and applies a force to said first body and, thereby, said breakable mechanical connection that is greater than said threshold holding force, whereby, when said first body is disposed on a proximal side of said occlusion and said second body is disposed on a distal side of said occlusion, said first body and said second body surround and contain said occlusion between said first and second bodies.