FIELD: medical engineering. SUBSTANCE: device has flexible membrane with membrane holder and fixing member attached to it. Supporting ring is fixed on the membrane perimeter as a spring with at least two rods introduced into the spring on the opposite sides with respect to the symmetry line running through the membrane holder and arc-shaped membrane rotation stopper mounted inside of the membrane holder. The membrane is made in form of ellipsoid of revolution. The membrane holder is made from flexible material and has the isosceles triangular form. The fixing member is set at a triangle vertex being a kind of springy member provided with gripping members at its ends and connected with the membrane rotation stopper. EFFECT: enhanced reliability of operation. 5 dwg
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