Patent ID: 8702699

Claim:
A medical instrument for treating body tissue, comprising an elongate shaft having a distal end and a proximal end, and defining a longitudinal direction, a handle arranged at said proximal end of said shaft, and having a carriage movable in said longitudinal direction, said carriage having a first seat, an elongate first work element holder having a distal end and a proximal end, a first work element being arranged at said distal end of said first work element holder, said proximal end of said first work element holder being releasably connectable with said first seat of said carriage of said handle, a receiver for receiving an endoscope having an endoscope shaft extending substantially parallel to said first work element holder, when said proximal end of said first work element holder is connected with said first seat of said carriage, wherein said carriage has at least a second seat which is spaced apart from said first seat, an elongate second work element holder having a distal end and a proximal end, said second work element holder supporting a second work element, said proximal most end of said second work element holder being releasably connectable with said second seat of said carriage of said handle, wherein said first seat of said carriage is provided with an electrical contact arrangement, and wherein said second seat of said carriage is electrically insulated relative to said first seat and is electrically insulated without having an electrical contact arrangement, such that said first work element can be electrically powered whereas said second work element may not be electrically powered, and wherein said first seat has a first lock mechanism configured for directly securing said proximal most end of said first work element holder and said second seat has a second lock mechanism configured for directly securing said proximal most end of said second work element holder, and wherein said first lock mechanism and said second lock mechanism are jointly assigned a common operating element for releasing said first and at least second work element holder.