Calculus retrieving/removing device and method

摘要

A device for retrieving calculus in a lumen of a living body includes an elongated member positionable in the living body lumen and including an inlet, an outlet and a retrieval space between the inlet and the outlet, and a sealing member movably positioned in the lumen of the elongated member to axially move in distal and proximal directions, wherein the sealing member is in sealing contact with the inner surface of the lumen in the elongated member. A plunger is connected to the sealing member and includes two parts separated from one another to form a divided sealing member when the plunger is moved in the distal direction and that directly contact one another to form an integrated sealing member when the plunger is moved in the proximal direction to draw fluid and the calculus into the retrieval space.

主权项

1. A device for retrieving calculus in a lumen of a living body comprising:
an elongated member possessing an outer dimension configured to permit the elongated member to be positioned in the lumen of the living body, the elongated member including a lumen possessing an inner surface, the elongated member also including an inlet, an outlet and a retrieval space in the lumen; a sealing member movably positioned in the lumen of the elongated member to axially move in a distal direction in the lumen toward the inlet and to axially move in a proximal direction in the lumen; the sealing member comprising a first part positioned in the lumen of the elongated member and a second part positioned in the lumen of the elongated member, the second part being positioned distally of the first part so that the second part is located axially between the inlet and the first part; the second part possessing an outer surface in sealing contact with the inner surface of the lumen in the elongated member; and the first part and the second part of the sealing member being axially movable relative to one another in the lumen when the sealing member is moved in the distal direction so that the first part and the second part are axially spaced apart from one another, and also being axially movable together as a unit in the lumen when the sealing member is moved in the proximal direction.