Patent ID: 7875008
Filing Date: 2011-01-25
Classification: A61L,A61M

Abstract:
1. A catheter for use in conveyance of a formulation, the catheter comprising: an outer material; an inner barrier material; a proximal end; and a distal end; wherein the inner barrier material at the distal end forms an innermost surface around a fluid flow passage of the catheter, where the innermost surface of the inner barrier material flares outward to widen the fluid flow passage adjacent the distal end of the catheter; and wherein the outer material protrudes a distance beyond the inner barrier material at the distal end and forms a generally semi spherical segment spaced from and enclosing the distal end, the semi spherical segment comprising at least one slit formed thereon, the at least one slit expanding upon a pump stroke of an infusion pump to release the formulation and closing at an interval between pump strokes to hinder inflow of substances into the distal end of the catheter.