FIELD: medical engineering.
SUBSTANCE: device has proximal portion rotatable in counter direction with respect to elastic spring action of torsion unit relative to distal portion in positive and negative rotation direction. The torsion unit has positive rotation direction torsion characteristic differing from that in negative rotation direction. The torsion unit has two separate springy torsion members having different spring characteristics and placed with prestress between supporting members mounted between the torsion members so that only one of springy torsion members acts in one of rotation directions.
EFFECT: high functional quality.
22 cl, 2 dwg
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