Abstract: A medical electrode arrangement for urological use, has a core with an aperture going therethrough. This aperture receives a first electrode. A cage is defined by at least a side wall having first and second ends. The first end has a receiving unit for receiving a second electrode. An inner space of said cage is situated between the first and second ends and is surrounded by the side wall. The inner space is adapted to receive the core with a first electrode and a second electrode. A plurality of openings penetrating through the side wall of the core and extend from the first end toward the second end.

Abstract: An external fixator having specialized pin holders which are slidably, but fixably disposed within hollow spacing members of the external fixation frame. The spacing members are externally threaded to receive nuts which fix the pin holders and the members are slotted to receive transfixion pins which are fixed in the pin holders by means of set screws.