Abstract: Symmetrical and asymmetrical snares are used for endoscopically controlled methods by which tumors in hollow organs of the gastrointestinal tract can be ensnared and RF-surgically removed from the organ wall for diagnostic and/or therapeutic purposes. These snares are characterized in that one of the two snare portions, in the case of asymmetrical snares the longer of the two snare portions, is completely electrically insulated or is made from electrically non-conductive material and that the other of the two snare portions is made from electrically conductive material and its surface is not electrically insulated. In one embodiment, the asymmetrical snare is characterized in that the long snare portion is so much flexurally stiffer than the short snare portion that it tensions the short snare portion like the string of a bow.

Abstract: Symmetrical and asymmetrical snares are used for endoscopically controlled methods by which tumors in hollow organs of the gastrointestinal tract can be ensnared and RF-surgically removed from the organ wall for diagnostic and/or therapeutic purposes. These snares are characterized in that one of the two snare portions, in the case of asymmetrical snares the longer of the two snare portions, is completely electrically insulated or is made from electrically non-conductive material and that the other of the two snare portions is made from electrically conductive material and its surface is not electrically insulated. In one embodiment, the asymmetrical snare is characterized in that the long snare portion is so much flexurally stiffer than the short snare portion that it tensions the short snare portion like the string of a bow.

Abstract: An asymmetrical opening RF surgical resection loop comprises a short electrically non-insulated loop section and a long electrically insulated loop section, where the distal ends of the loop sections are interconnected. Furthermore, a manipulation wire guided in an insulated catheter and displaceable in the longitudinal direction thereof is connected to this loop section in order to slide the long loop section out from the catheter. The short loop section is withdrawn from the catheter by the long loop section. An insulated stop wire is connected to the short loop section and is also pulled out a predefined length from the catheter by this, where at least the pulled out section of the stop wire is electrically insulated. By means of an entrainer device, the stop wire and the short loop section connected to this is withdrawn into the catheter upon withdrawal of the manipulation wire.

Abstract: The invention relates to a device for holding an elastically deformable winding article, in particular a flexible medical instrument such as a medical guidewire or a catheter, with a winding article receptacle and with a housing part (14) covering the winding article receptacle at least in parts, which form a receptacle space for holding the winding article, the winding article receptacle and the housing part being connected to one another such that they are twistable relative to each other and a winding article guide being provided in the receptacle space, which winding article guide arranges a number of turns of the winding article next to each other when winding the winding article. (FIG.