Through the scope tension member release clip
An apparatus for deployment of a hemostatic clip comprises a handle assembly, a shaft connected to a distal portion thereof and a clip assembly releasably coupled to a distal portion of the shaft. The clip assembly includes clip arms and a capsule cooperating with the clip arms to provide a first user feedback indicating a decision configuration of the clip assembly. In addition, the apparatus includes a control wire including a ball connector, the control wire extending from the handle assembly and coupled to the clip assembly by the ball connector to maintain the clip assembly coupled to the shaft, wherein the ball connector is detachable from the clip assembly to provide a second user feedback indicating separation of the clip assembly from the shaft.
1. A method, comprising:
advancing to a target site within a living body a medical device comprising a clip having first and second arms biased toward an open configuration, the device further comprising a control wire removably connected to the clip and an elongated sheath housing the control wire;
actuating an actuator to move the control wire proximally and distally to open and closed the first and second clip arms to grasp tissue therebetween;
generating a first user feedback during proximal movement of the control wire; and
applying a first force to the control wire to sever a connector between the control wire and the clip, uncoupling the connector from the clip at a preselected failure point to provide a second user feedback indicating separation of the clip from connector.
2. The method of claim 1 , wherein the generating step comprises moving the control wire proximally to cause the clip to move proximally into a capsule removably housing a portion of the clip therein, and causing the clip to move to a closed configuration wherein the first and second clip arms are drawn toward one another.
3. The method of claim 2 , further comprising:
locking the clip against the capsule in the closed configuration.
4. The method of claim 1 , wherein when the first and second arms are in an open configuration, proximal ends of the first and second arms are positioned under a yoke, the yoke constraining movement of the first and second arms.
5. The method of claim 4 , wherein opposed sides of the yoke are pulled away from a tension member received between the sides of the yoke to sever the connector.
6. The method of claim 5 , wherein the tension member received between the sides of the yoke is a tension member coupled to the clip.
7. The method of claim 6 , wherein the tension member comprises a projection received between sides of the yoke.
8. The method of claim 4 , wherein the control wire is received within a socket of the yoke.
9. The method of claim 1 , wherein the connector between the control wire and the clip is severed when a tension on the control wire exceeds a threshold level.
10. The method of claim 1 , wherein the clip is received within a capsule and wherein the capsule includes a member at a distal end thereof that projects between arms of the clip to spread the arms apart from one another as the clip is extended distally from the capsule.
11. The method of claim 1 , wherein the clip includes clip arms within a capsule and wherein a tension member received between arms of the clips biases the clip arms apart so that, as the actuator is moved distally the clip arms move distally out of the capsule and spread apart from one another due to the influence of the tension member.
12. The method of claim 1 , further comprising: before the clip is separated from the connector, moving the control wire distally to push the clip out of the capsule, opening the arms.
13. The method of claim 1 , further comprising: moving the control wire proximally to draw the clip proximally into the capsule moving the clip to a closed configuration with the first and second clip arms drawn toward one another.