Through the scope tension member release clip
A hemostatic clip assembly for mounting on a delivery device comprises a capsule and a clip slidably mounted within the capsule so that, when the clip is drawn proximally into the capsule, arms of the clip are drawn together to a closed position, an abutting surface of at least one of the arms contacting a corresponding surface of the capsule when the clip is drawn to a predetermined position within the capsule to provide a first user feedback indicating closure of the clip in combination with a tension member connected to the clip arms and biasing the clip arms toward an open, tissue receiving configuration and a yoke slidably received within the capsule and releasably coupled to the tension member, the yoke including a ball cavity for receiving a ball connector of a control element of the delivery device to maintain the clip assembly coupled to the delivery device, wherein the control element is frangible to detach the yoke from the delivery device and to provide a second user feedback and, wherein release of the yoke from the tension member provides a third user feedback.
1. An apparatus for applying clips to tissue, comprising:
a flexible sheath extending from a proximal end which, in an operative configuration, extends into a living body to a target portion of tissue to be clipped;
a capsule extending from a proximal to a distal end and having an opening formed in a proximal end thereof;
a clip assembly provided in the capsule and configured to be operably movable between a closed configuration in which first and second arms of the clip assembly are drawn toward one another and an expanded configuration in which the first and second arms are separated from one another to receive target tissue therebetween;
a control member a distal end of which is releasably coupled to the clip assembly to transmit to the clip assembly forces applied thereto to move the clip assembly between the closed and expanded configurations; and
a separable yoke connecting the control member to the clip assembly, the yoke configured to be separated by the control member, so that when the yoke is separated, the control member uncouples from the clip assembly.
2. The apparatus of claim 1 , wherein the opening is substantially A-shaped.
3. The apparatus of claim 1 , wherein a proximal end of the control member is coupled to a control handle which, when the apparatus is in an operative position, remains outside the body accessible to a user.
4. The apparatus of claim 1 , wherein the control member is coupled to the clip assembly via a frangible link, the frangible link including the yoke.
5. The apparatus of claim 4 , wherein the frangible link is formed as a reduced strength portion of the control member.
6. The apparatus of claim 4 , wherein the frangible link is configured to break.
7. The apparatus of claim 1 , wherein the clip assembly is biased to the expanded configuration.
8. The apparatus of claim 1 , further comprising an actuator coupled to the control member and configured to open the clip assembly, close the clip assembly and uncouple the clip assembly from the control member.
9. The apparatus of claim 1 , wherein movement of the control member distally causes the clip assembly to move distally relative to the capsule and to the expanded configuration.
10. The apparatus of claim 1 , wherein movement of the control member proximally causes the clip assembly to move proximally into the capsule, the proximal movement causes the clip assembly to move to the closed configuration.
11. The apparatus of claim 1 , wherein the yoke is configured to be separated by a predetermined force applied by the control member.
12. The apparatus of claim 1 , wherein the predetermined force is at least approximately 4 lbf.
13. The apparatus of claim 1 , wherein the predetermined force is less than approximately 12 lbf.
14. The apparatus of claim 1 , wherein the yoke connects the control member to the clip assembly by a C-shaped connection.
15. The apparatus of claim 1 , wherein the yoke is configured to be separated by deformation of the C-shaped connection.
16. The apparatus of claim 1 , further comprising a locking arrangement configured to lock the clip assembly against the capsule in the closed configuration.
17. The apparatus of claim 1 , wherein separation of the yoke locks the clip assembly in the closed configuration.
18. The apparatus of claim 1 , wherein the proximal end of the capsule comprises a keyed portion aligning the capsule in a desired rotational orientation with respect to the clip assembly.