Interlocking loop coupling/decoupling system for deploying vascular implant devices
In a system and method for deployment of an implant device, the implant device includes a first loop at its proximal end, and a deployment tool has a second loop attached at its distal end. A release wire slidably disposed within the deployment tool has a distal end extending through the first and second loops to releasably couple the implant device to the deployment tool, and a proximal portion extending from a proximal end of the deployment tool, which is held in a retraction device. The retraction device is operable to hold the proximal end of the deployment tool and to pull the release wire proximally through the deployment tool until the distal end of the release wire is withdrawn from the first and second loops to decouple the implant device from the deployment tool.
1. A device for retracting a release wire having a distal end releasably coupling a vascular implant device to a distal end of an intravascularly-introduced deployment tool, wherein the deployment tool has a proximal portion from which a proximal portion of the release wire is exposed, the device comprising:
a housing having a distal opening configured for receiving the proximal portion of the deployment tool from which the proximal portion of the release wire is exposed;
a gripping assembly in the housing and configured for releasably gripping the exposed proximal portion of the release wire;
a guide assembly movably mounted in the housing between a distal position and a proximal position, and operatively connected to the gripping assembly to move the gripping assembly between engagement with and disengagement from the exposed proximal portion of the release wire; and
an actuator having an external portion configured for manipulation distally and proximally by a user, and an internal portion operatively connected to the guide assembly for moving the guide assembly between the distal position and the proximal position;
wherein the gripping assembly comprises a fixed gripping element fixed in position in the housing, and a movable gripping element operatively connected to the guide assembly to be moved between a position of engagement with the exposed proximal portion of the release wire when the guide assembly is in an intermediate position and a position of disengagement from the exposed proximal portion of the release wire when the guide assembly is in the proximal position; and
wherein the guide assembly comprises a lever having a first end in which the movable gripping element is disposed, and a second end movably seated in a guide path defined by a track in the guide assembly, wherein the track is configured to move the lever so as bring the movable gripping element into engagement with the exposed proximal portion of the release wire as the guide assembly is moved proximally, and to move the lever to disengage the movable gripping element from the exposed proximal portion of the release wire as the guide assembly is moved distally.
2. The device of claim 1 , wherein the guide assembly is operatively connected to the gripping assembly to engage the exposed proximal portion of the release wire when the guide assembly is in an intermediate position, and to disengage from the exposed proximal portion of the release wire when the guide assembly is in the proximal position.
3. The device of claim 1 , wherein the guide assembly is spring-biased toward the distal position.
4. The device of claim 1 , wherein the track defining the guide path is configured as a closed loop.
5. The device of claim 1 , wherein the second end of the lever is configured as a guide arm movably engaged with the track.