Patent ID: 8366659

Claim:
An ischemic postconditioning system comprising: a catheter, the catheter including a plurality of lumens and at least one expandable member; at least one chamber including a moveable plunger and a return mechanism operatively engaged with the plunger, the moveable plunger dividing the at least one chamber into first and second volumes; a first pressure source having a first fluid at a first pressure, the first pressure source disposed in fluid communication with the first volume of the chamber; a second pressure source having a second fluid at a second pressure, the second pressure source and the at least one expandable member disposed in fluid communication with the second volume of the chamber; wherein the first fluid supplied by the first pressure source displaces the plunger in a first direction delivering at least a portion of the second fluid into the at least one expandable member; and wherein the return mechanism displaces the plunger in a second direction delivering the second fluid from the second pressure source to the second volume of the chamber.