Device and method for through the scope endoscopic hemostatic clipping
Medical device used to cause hemostasis of blood vessels using a clip arrangement delivered to a target region through an endoscope. Method for using the device to cause hemostasis of a blood vessel through an endoscope. Medical device including a reversibly closeable clip, a locking arrangement, a control wire, a sheath, and a handle with an actuating trigger. Through the endoscope, hemostatic clipping device that is fully reversible and lockable. Hemostatic clip that reversibly targets and clips bleeding ulcers.
1. An endoscopic clipping device, comprising:
a clip having first and second clip legs, the legs having first and second cutouts extending through respective proximal portions thereof;
a control wire coupled to the clip and reversibly operable to move the first and second clip legs between an open configuration in which distal ends of the first and second legs are separated from one another and a closed configuration in which the distal ends of the first and second legs are drawn together to grip tissue located therebetween, the control wire including a hook at a distal end thereof, the hook being configured to be releasably received within the first and second cutouts of the clip;
an axially rigid sheath enclosing the control wire, the sheath configured to communicate a first force opposing a second force of the control wire;
a handle coupled to the axially rigid sheath; and
an actuator coupled to the control wire and configured to move the first and second clip legs between the open and closed configurations, application of a predetermined force to the actuator applying a force to the control wire sufficient to disengage the hook from the first and second cutouts and separate the control wire from the clip.
2. The clip of claim 1 , wherein the control wire and the clip are non-rotatably coupled to the sheath.
3. The clip of claim 2 , further comprising a lock sleeve slidably received around the clip and an outer sleeve slidably mounted over the lock sleeve, movement of the outer sleeve distally over the lock sleeve moving the lock sleeve distally over the first and second legs to maintain the first and second legs in the closed configuration.
4. The clip of claim 3 , wherein the lock sleeve comprises a lock pawl configured to lockingly engage first and second lock holes extending through the first and second legs to lock the clip in the closed configuration.
5. The clip of claim 4 , further comprising a retainer configured to releasably engage the control wire with the lock sleeve, the retainer having an opening extending longitudinally therethrough to receive the control wire and first and second retainer tabs extending radially thereoutof to releasably engage first and second retainer holes in the outer sleeve.
6. The clip of claim 5 , wherein the hook is positioned distally of the retainer opening.
7. The clip of claim 6 , wherein the application of a proximally directed force to the control wire causes the hook to apply the proximally directed force to the retainer to disengage the retainer tabs from the lock sleeve and the hook to subsequently become straightened and disengage from the first and second cut-outs of the clip.
8. The clip of claim 7 , wherein a magnitude of the proximally directed force required to cause straightening of the hook of the control wire is greater than a load required to lockingly grasp tissue between the first and second clip legs.
9. The clip of claim 3 , wherein the first and second legs are biased toward the open configuration so that, movement of the outer sleeve proximally relative to the clip pulls the lock sleeve away from the clip permitting the clip to move to the open configuration.
10. The clip of claim 3 , wherein the lock sleeve comprises a lock sleeve cut-out on a distal end thereof to permit withdrawal of a proximal portion of the clip thereinto.
11. The clip of claim 1 , wherein the first and second clip legs have a rectangular cross-section.
12. The clip of claim 1 , wherein the actuator is configured to pivot about a pivot point to apply a mechanical movement force to the control wire.
13. A device for causing hemostasis, comprising:
a clip having first and second clip legs, the legs having first and second cutouts extending through respective proximal portions thereof;
a control wire coupled to the clip and reversibly operable to move the first and second clip legs between an open configuration in which distal ends of the first and second legs are separated from one another and a closed configuration in which the distal ends of the first and second legs are drawn together to grip tissue located therebetween, the control wire including a hook at a distal end thereof, the hook being configured to be releasably received within the first and second cutouts of the clip;
an actuator coupled to the control wire and configured to move the first and second clip legs between the open and closed configurations, application of a predetermined force to the actuator applying a force to the control wire sufficient to disengage the hook from the first and second cutouts and separate the control wire from the clip; and
an outer sleeve receiving a portion of the clip including the first and second cutouts.
14. The device of claim 13 , further comprising a lock sleeve slidably received around the clip, wherein the outer sleeve is slidably mounted over the lock sleeve so that movement of the outer sleeve distally over the lock sleeve moves the lock sleeve distally over the first and second legs to maintain the first and second legs in the closed configuration.
15. The device of claim 14 , wherein the lock sleeve comprises a lock pawl configured to lockingly engage first and second lock holes extending through the first and second legs to lock the clip in the closed configuration.
16. A method for causing hemostasis, comprising:
inserting a clipping device to a target position in a body adjacent target tissue to be clipped, the clipping device comprising a clip having first and second clip legs, the legs having first and second cutouts extending through respective proximal portions thereof, a control wire coupled to the clip and reversibly operable to move the first and second clip legs between an open configuration in which distal ends of the first and second legs are separated from one another and a closed configuration in which the distal ends of the first and second legs are drawn together to grip tissue located therebetween, the control wire including a hook at a distal end thereof, the hook being configured to be releasably received within the first and second cutouts of the clip, an axially rigid sheath enclosing the control wire, the sheath configured to communicate a first force opposing a second force of the control wire,
actuating an actuator coupled to the control wire to grasp the target tissue between the first and second clip legs, the actuator being configured to move the first and second clip legs between the open and closed configurations, the actuator being provided on a handle coupled to the axially rigid sheath; and
actuating the actuator to apply a proximally directed force to the control wire to disengage the hook from the first and second cutouts and separate the control wire from the clip.
17. The method of claim 16 , wherein the clipping device comprises a retainer configured to releasably engage the control wire with the lock sleeve, the retainer having an opening extending therethrough to receive the control wire and first and second retainer tabs extending radially thereoutof to releasably engage first and second retainer holes in the outer sleeve.
18. The method of claim 17 , wherein the hook is positioned distally of the retainer opening and configured to apply the proximally directed force to the retainer to disengage the retainer tabs from the lock sleeve.