FIELD: inoperative treatment of cholelithiasis. SUBSTANCE: dilator allows recovery of affected organ lumen and may be removed after its function is carried out. Dilator has frame made of material with form memory. It is manufactured as helical spring with shaped section of turn. Turns are arranged snugly to one another. Both ends of spring are fitted with locks. The latter are made in the form of straight or shaped section to facilitate dilator removal. Straight section may be positioned in parallel to frame axis or at an angle to it. EFFECT: improved design. 1 dwg
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