Systems and methods for attaching a prosthesis within a body lumen or hollow organ
Systems and methods introduce and deploy prosthesis into a blood vessel or hollow body organ by intra-vascular access. The prosthesis is secured in place by fasteners which are implanted by an applier that is also deployed by intra-vascular access. The applier is configured to permit controlled, selective release of the fastener in a step that is independent of the step of implantation.
1. An assembly for applying an implantation force to a fastener sized and configured for implantation in tissue in response to the implantation force, the assembly comprising:
a tool body;
a driven member carried by the tool body and being operable to apply the implantation force, the driven member comprising a drive actuator to operate the driven member; and
a mechanism comprising hinged gripping jaws coupled to the driven member such that rotation of the driven member rotates the hinged gripping jaws, the mechanism operable in a first condition to couple the fastener to the driven member to transfer the implantation force from the driven member to the fastener, the mechanism being operable in a second condition to release the fastener from the driven member, the mechanism comprising a second actuator operable independent of the drive actuator to place the mechanism in the second condition.
2. The assembly of claim 1 , wherein the second actuator is operable to place the mechanism in the first condition in addition to the second actuator being operable to place the mechanism in the second condition.
3. The assembly of claim 1 , wherein the mechanism comprises means for placing the mechanism in the first condition absent operation of the second actuator.
4. The assembly of claim 1 , wherein the mechanism comprises a support element on the driven member sized and configured to assume the first condition absent operation of the second actuator.
5. The assembly of claim 1 , wherein:
the driven member is operable to apply a removal force to withdraw the fastener from tissue;
and the mechanism is operable in the first condition to couple the fastener to the driven member to transfer the removal force from the driven member to the fastener.
6. The assembly of claim 5 , wherein the driven member is rotated in one direction to apply the implantation force and rotated in an opposite direction to apply the removal force.
7. The assembly of claim 1 , wherein the tool body comprises a tubular member that carries the driven member and the mechanism.
8. The assembly of claim 1 , wherein the mechanism comprises a distal portion having a configuration that corresponds to a configuration of a proximal end of the fastener, such that the proximal end of the fastener engages with the distal portion of the mechanism to couple the fastener to the mechanism throughout the first condition.
9. The assembly of claim 8 , wherein the proximal end of the fastener comprises a leg portion that engages with the distal portion of the mechanism throughout the first condition.
10. The assembly of claim 9 wherein the leg portion is gripped by the hinged gripping jaws in the first condition.
11. The assembly of claim 1 , wherein the fastener comprises a helical fastener.
12. The assembly of claim 1 wherein the hinged gripping jaws are in a mutually closed position in the first condition.
13. The assembly of claim 1 wherein the hinged gripping jaws are in a mutually opening condition in the second condition.
14. The assembly of claim 1 wherein the hinged gripping jaws comprise cam surfaces, the assembly further comprising:
a cam element between the cam surfaces.
15. The assembly of claim 14 further comprising a pull cable coupled to the cam element.
16. The assembly of claim 15 further comprising a handle comprising a controller coupled to the pull cable.
17. The assembly of claim 1 wherein the hinged gripping jaws comprise an integral hinge which biases the hinged gripping jaws to the first condition.