Medical device

摘要

A medical device is configured to prevent a member attached to the distal end of an operation wire passing through a catheter from dropping out from an operation wire. The medical device includes an operation wire which passes through a catheter and which is advanceable and retractable toward the axial direction with respect to the catheter, a distal member interlocked on the distal side of the operation wire, and a grasping unit which is interlocked on the proximal side of the operation wire. The medical device also includes a safety mechanism for releasing the interlock between the operation wire and the grasping unit by a load lower than the breaking strength between the operation wire and the distal member.

主权项

1. A medical device comprising:
at least one tubular member having a through hole, the at least one tubular member including a catheter sized and configured to be positioned in a living body, the through hole at a distal end of the tubular member possessing a size; an operation wire positioned in the through hole and passing through the at least one tubular member so that a proximal end of the operation wire extends proximally beyond a proximal end of the at least one tubular member and a distal end of the operation wire extends distally beyond the distal end of the at least one tubular member, the operation wire being axially movable in distal and proximal directions relative to the at least one tubular member; a distal member connected to the distal end of the operation wire at a connection, the distal member being positioned distally of the distal end of the at least one tubular member, the distal member being disconnectable from the operation wire when a load is applied to the connection which exceeds a breaking strength of the connection; the distal member possessing a size greater than size of the through hole at the distal end of the tubular member so that the distal member is prevented from entering the through hole in the at least one tubular member when the operation member is axially moving in the proximal direction; a grasping unit connected to the proximal end of the operation wire at a connection; and a safety mechanism operatively associated with the grasping unit and the proximal end of the operation wire which causes the grasping unit to be disconnected from the operation wire when a load less than the breaking strength is applied to the connection of the grasping unit to the operation wire; wherein the grasping unit includes a main body possessing a tapered opening at a proximal end of the main body, a proximal end fixing member positioned in the tapered opening at a proximal end of the main body, the proximal end fixing member possessing a tapering through hole in which a distal end of the through hole is smaller in size than a proximal end of the through hole, and including a proximal member fixed to the proximal end of the operation wire, the proximal member possessing an outer dimension greater than the size of the through hole at the distal end of the through hole, and including a resin fixing the proximal end fixing member in place within the tapered opening and also fixing the proximal member in the through hole.