The immediate release patch in the correction of experimental atrial septal defects.

Objectives: The purpose of this study was to evaluate the safety and efficacy of the Immediate Release Patch (IRP) in the occlusion of experimental Atrial Septal Defects (ASDs).

Background: The IRP consists of a polyurethane foam patch, supported by a balloon catheter which incorporates a detaching mechanism. This mechanism allows for withdrawal of the catheter from the balloon/patch complex.