Abstract: Disclosed is a device for lifting the abdominal wall for laparoscopy, whereby the device can be inserted into the abdominal cavity through an opening in the abdominal wall, having an instrument shaft, which is provided at its distal end region with at least one, preferably two limbs disposed parallel to the axis of the instrument shaft and the can be folded open laterally to the shaft axis. The invention is distinguished by the limbs being joined to the instrument shaft via a folding mechanism, which rotates the limbs at an angle ranging up to 180°.

Abstract: The annular valve (10) comprises a valve seat (11) attached in the housing (1) of the compressor, an absorber (14) attached thereto at a distance and an annular sealing component (12), which can move between the valve seat and the absorber. Helical springs (2), which move the sealing component in the closing direction towards the valve seat, are distributed over its periphery between the absorber and the sealing component. Each helical spring (2) is fastened with one end in the absorber (14). In the region of the other end of each helical spring (2), the sealing component (12) is provided with guide means (6) for the respective spring end.