Patent ID: 9339269
Filing Date: 2016-05-17
CPC Classification: A61B,A61N

Claim Text:
1. An explantation device for explanting implanted leads, having a distal end pointing in the direction of the explantation site and a proximal end pointing in the direction of the surgeon, the explantation device comprising: a locking sheath for releasably fastening to an implanted lead, the locking sheath comprising a hose-like or tubular body having a distal end and a proximal end and a lumen along a longitudinal axis which has an opening both at the distal end and at the proximal end, and further comprising at least one clamping device at or in the vicinity of the distal end, wherein the clamping device can be transferred from a relaxed state into a clamped state and back into the relaxed state; and a cutting sheath for removing adhering tissue, the cutting sheath comprising a hose-like or tubular body having a proximal end and a distal end with a lumen along a longitudinal axis designed and dimensioned so that the locking sheath is introduced in the lumen of the cutting sheath and is displaceably mounted therein, the lumen having an opening both at the proximal end and at the distal end, and further comprising a detaching unit at or in the vicinity of the distal end, the cutting sheath being freely movably in relation to the locking sheath along the longitudinal axis; wherein the cutting sheath comprises at least one receptacle for the clamping device of the locking sheath, the receptacle being designed so as to receive the clamping device therein in the relaxed state of the clamping device; wherein in the clamped state the at least one clamping device causes fixation of the locking sheath to the implanted lead and in the relaxed state releases the fixation of the locking sheath to the implanted lead, wherein the transfer from the relaxed state into the clamped state, and from the clamped state into the relaxed state, takes place with utilization of a spring force, by displacing the cutting sheath, and hence the at least one receptacle, along the longitudinal axis in relation to the locking sheath so that the at least one clamping device moves out of or into the at least one receptacle; wherein the locking sheath is guided with the cutting sheath when the at least one clamping device is present in the at least one receptacle; wherein the at least one clamping device is a collet, which comprises at least one clamping link extending in a direction of the longitudinal axis, wherein each clamping link comprises a first section, which at a first end is attached to the locking sheath, and a second section having an end projecting radially in the direction of the longitudinal axis; wherein the at least one receptacle comprises a proximal wall section and a distal wall section, each having an extension component in the radial direction of the longitudinal axis, wherein the proximal wall section in a direction of the distal end of the cutting sheath has a directional component that is directed radially away from the longitudinal axis and the distal wall section has a directional component that is directed radially toward the longitudinal axis; and wherein at least one of the proximal wall section and the distal wall section has a respective extension direction parallel to the first or second sections of the at least one clamping link of the at least one clamping device.