Introducer

摘要

A stent graft introducer (1) has a distally opening capsule (5) on a nose cone dilator (3) and a plug device (17; 53) in the capsule. The plug device (17; 53) is movable longitudinally within the capsule (5) to move to a distal end (7) of the capsule (5) to extend from the capsule (5) whereby to provide a smooth transition from the otherwise distal opening (7) of the capsule (5) to enable retraction of the nose cone dilator (3) through a deployed stent graft (35). The capsule (5) includes an in-turned distal end (7) and the plug device (17; 53) has a proximal shoulder (25) whereby to prevent the plug device (17; 53) from being completely withdrawn from the capsule (5). The plug device (17; 53) has a distal linearly tapered surface (27) or a distally facing bullet shaped surface (57). There can be an arrangement (72; 80) to prevent subsequent retraction of the plug device (53; 17).

主权项

1. An introducer comprising a guide wire cannula extending from a handle to a nose cone dilator at a proximal end of the guide wire cannula, a distally opening capsule on the nose cone dilator, a plug device in the capsule, the plug device being mounted onto the guide wire cannula and being movable longitudinally with respect to the guide wire cannula, whereby movement of the plug device to a distal end of the capsule to extend from the capsule provides a smooth transition from the otherwise distal opening of the capsule to enable retraction of the nose cone dilator through a deployed stent; and
an anti-return arrangement comprising at least one of:
at least one engagement tab extending into the capsule whereby the plug device can pass the at least one engagement tab when moving in a distal direction but cannot pass the at least one engagement tab when moving in a proximal direction; oran O-ring secured around the plug device which can pass out of the capsule but cannot re-enter the capsule.