Patent ID: 8574221

Claim:
A medical device configured for dynamic movement through a body passageway toward an interior target site, and for withdrawal therefrom, comprising: a generally flexible elongated tubular member having a proximal portion extending to a proximal end, a distal portion extending to a distal end, a plurality of projections disposed on an exterior surface of said distal portion, a lumen extending through said tubular member, and a port at said distal portion providing communication between said lumen and an environment of said body passageway exterior of the tubular member, said projections configured to engage an interior surface of the body passageway during bodily contractions thereof to promote ingress of the device along said body passageway in response to said contractions; a first string member having a proximal end and a distal end, said first string member extending interiorly of said tubular member along said lumen to said port, and exteriorly of said tubular member from said port substantially to said tubular member distal end, said first string member arranged such that said proximal end extends proximal of said tubular member proximal end, and said distal end is affixed to said tubular member distal of said port; and a second string member having a proximal end and a distal end, said second string member extending exteriorly along said tubular member substantially to said distal end of said tubular member, said second string member arranged such that said proximal end extends proximal of said tubular member proximal end, and said distal end is affixed to said tubular member distal of said port.