Wire drive in a medical device

Drive device in a medical device for driving a wire through a guide tube from a first position in which a distal end of said wire is outside an animal body to a second position in which said distal end is inside said animal body, said drive device comprising first and second elements rotatable relative to each other about a common axis, said first and second elements having contact surfaces, said contact surfaces in each rotational position of said first and second elements relative to each other being in contact with each other in a contact area along a common contact plane, a storage space for said wire going around said axis in said first element, said storage space being open to said contact surface of said first element, said contact plane extending from a distance from said axis smaller than a smallest distance of said storage space from said axis to a distance from said axis greater than a largest distance of said storage space from said axis, said second element comprising a channel for said wire, said channel being open to said contact plane at a first position opposite said storage space and extending to a second position at a surface of said second element outside said contact area of said common contact plane.