Stent delivery system

摘要

An operating unit in a stent delivery system comprises a displacement body including a first body connected to an outer tube body and a second body which is connected to the first body and meshed with a rotary roller. A first connection surface of the first body is formed with a first convex portion and a first concave portion recessed relative to the first convex portion. The first convex portion engages a second concave portion of the second body and a second convex portion engages the first concave portion. When movement of the displacement body becomes difficult for some reason and the operator forcibly rotates the rotary roller, the engaged state of the second body and the first body is released and the second body is relatively moved, thus preventing movement of the first body in the axial direction.

主权项

1. A stent delivery system comprising:
an inner tube; a stent which is compressed toward a center axis and disposed on a distal side of the inner tube at a time of insertion into a lumen of a living body, and which is restored to its pre-compression shape by expanding outward when put indwelling in the lumen of the living body; an outer tube disposed on an outer surface side of the inner tube and possessing a lumen containing the stent, the outer tube being axially movable in a proximal direction relative to the inner tube to release the stent to an exterior of the stent delivery system; an operating unit operatively connected to the outer tube to axially move the outer tube relative to the inner tube, the operating unit comprising:
a housing;an operation body operable by an operator;a displacement body which is mounted in the housing to axially move relative to the housing, the displacement body including a first block connected to the outer tube and a second block on which a load is exerted due to operation of the operation body by the operator, the second block being connected to the first block; anda releasing mechanism by which the connection between the first block and the second block is released so that the second block is moved relative to the first block when a load of not less than a predetermined value is applied to the second block from the operation body.