Abstract: In an apparatus for medical treatments, examinations or tests comprising a hamber connectible to a vacuum source and having at its one end side a passage aperture with a flexible sealing member, the chamber is formed of a foldable bellow provided with a support structure adapted to be dismantled. In axial direction of the bellow, the support structure contains a plurality of substantially parallel-mounted peripheral members backing up peripherally the bellow and being mobile relative to each other, as well as mobile longitudinal stiffening elements secured to the peripheral members.

Abstract: Sound heads (SK1 to SK3) are fixed, distributed peripherally, on the part of the body, e.g. an arm or leg. Each of the sound heads is able to transmit ultrasonic signals along a measuring section (MS1 to MS3) leading to another sound head, which signals are received by the other sound head. The sound heads can consist of angularly arranged sound members (14). In this way, all three sides of a polygon formed by the sound heads are measured, from which measurements the surface area of the polygon can be determined.