Abstract: A tissue access system for tissue ablation without open surgery includes a distally open elongated tube (4) with a handle piece (6) having a through channel (7) in axial alignment with the elongated tube and an infusion fitting (9) that opens into the through channel for supplying a liquid or gaseous medium. An energy guide (16) or a catheter (10) housing such energy guide is arranged in the elongated tube and sealed from the outside. An energy-releasing zone of the energy guide is located in an energy-transparent section of the elongated tube. The medium, introduced into an annular flow channel between the energy guide or catheter and the elongated tube, serves as coolant for the energy-releasing zone and as heat transport medium in the tissue, and can also function as an ablation agent and as a contrast agent for inspection using imaging techniques.

Abstract: A tissue access system used for tissue ablation without open surgery includes a distally open tube-like hollow organ (4) with a proximally introduced handle piece (6) that comprises a through channel (7) in axial alignment with the hollow organ and an infusion fitting (9) that opens into the through channel for supplying a liquid or gaseous medium. An energy guide (16) such as a laser light guide or a catheter housing such light guide is arranged in the hollow organ and fixed in a sealing manner towards the outside using a seal (8) provided in the through channel. The energy-releasing zone of the energy guide is located in an energy-transparent section of the hollow organ. The medium, introduced into an annular flow channel between the energy guide or catheter and the hollow organ, serves as coolant for the energy-releasing zone of the energy guide and as heat transport medium in the tissue and can also function as an ablation agent and as contrast agent for inspection using imaging techniques.