FIELD: medical engineering. SUBSTANCE: device has at least one flat spring composed of at least two sheet members set in work at the same time. The sheets are placed alongside each other and joined to each other in both end zones with some space visible against light between the said end zones. The connection is made so that moment loads are receivable by both members together at least in one end zone. EFFECT: enhanced reliability and strength. 13 cl, 6 dwg
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