A high-pressure multi-stage centrifugal compressor is provided containing at least three compressor elements which are arranged in series as compressor stages, and at least two electric motors to drive these compressor elements. The method uses a refrigeration device that subjects a working fluid such as helium to a work cycle including: compression, cooling, and decompression, as well as heat exchange with the member and heating. Each bio-compatible fixation element has a tissue adherence property greater than that of the tape.