Patent ID: 6319251
Filing Date: 2001-11-20
Classification: A61B,C08L

Abstract:
A medical device system for treating intravascular restenosis comprising:a flexible catheter shaft having a distal section, a shaft distal end, a shaft proximal end, and at least one lumen extending between the shaft proximal end and the shaft distal end, wherein the at least one lumen has at least one opening at the shaft distal end;a handle attached to the shaft proximal end, wherein the handle has a cavity;an inner catheter located inside the at least one lumen of the catheter shaft, wherein the inner catheter comprises a distal end and a proximal end;a wire assembly arrangement mounted at the distal end of the inner catheter, wherein the wire assembly arrangement comprises a plurality of preshaped expandable metallic basket members, wherein at least a portion of the preshaped expandable metallic basket members is essentially straight adapted for contacting a pre-implanted stent for treating intravascular restenosis, each metallic basket member having a member distal end, a member proximal end, wherein the member proximal ends of the preshaped expandable metallic basket members are joined at the distal end of the inner catheter and wherein the member distal ends of the preshaped expandable metallic basket members are joined at a distal joint;a wire assembly deployment mechanism mounted on the handle, wherein the wire assembly deployment mechanism is coupled to the proximal end of the inner catheter, wherein the plurality of preshaped expandable metallic basket member are expanded at a deployed state, and wherein the plurality of preshaped expandable metallic basket members are retracted at a non-deployed state;a wire guide shaft at the distal section of the catheter shaft, the wire guide shaft having a proximal end and a distal end that the wire guide shaft defines a wire guide lumen, wherein the wire guide lumen has at least one opening at the distal end and at least one opening at the proximal end of the wire guide shaft wherein the wire guide shaft is used for introducing said medical device system into a vascular vessel over a guidewire; anda RF current generating means for generating RF current, wherein the RF current is supplied to the wire assembly arrangement through an electric conductor for contacting a pre-implanted stent, wherein the wire assembly arrangement and the pre-implanted stent forms an electrode arrangement for delivering RF current to a tissue for treating intravascular restenosis.