Devices and methods for delivering an implant to a vascular disorder
A device for delivering an implant (e.g., an embolic micro-coil) to a vascular disorder of a patient includes a delivery pusher, a moveable element, and first and second elongate members. The delivery pusher defines a lumen between its proximal and distal ends. The moveable element (e.g., a floating tube or a floating coil) defines a passageway therethrough and is disposed within the lumen of the delivery pusher. The first and second elongate members (e.g., core wires) are also disposed within the lumen of the delivery pusher. A portion of each elongate member passes through the passageway of the moveable element. Movement of the first elongate member in a first direction (e.g., retraction of the first elongate member from a locked to an unlocked configuration) causes a time-delayed or lost motion movement of the second elongate member in the same (i.e., first) direction, which releases the implant from the delivery pusher.
1. A system for delivering an implant to a vascular disorder of a patient, the system comprising:
a delivery pusher comprising a proximal end and a distal end and defining a lumen between the proximal and distal ends;
an implant disposed proximate the distal end of the delivery pusher;
a structure extending from the implant, the structure defining an aperture; and
an elongate member extending through the lumen of the delivery pusher, through the aperture of the structure, and into the implant.
2. The system of claim 1 , wherein the distal end of the delivery pusher defines a notch.
3. The system of claim 2 , wherein the structure is positioned such that the aperture is disposed within the notch of the delivery pusher.
4. The system of claim 1 , wherein the implant comprises an embolic coil.
5. The system of claim 4 , wherein the implant further comprises a cover wound around the embolic coil.
6. The system of claim 5 , wherein the structure is coupled to at least one of the embolic coil and the cover.
7. The system of claim 4 , wherein the elongate member extends into the embolic coil up to at least one of (i) a distance defined by 10 coil loops, (ii) a distance defined by 5 coil loops, and (iii) 1 mm.
8. The system of claim 1 , wherein the structure comprises at least one of a proximal tab, a looped structure, and a hypotube.
9. The system of claim 1 , wherein the elongate member comprises a core wire.
10. A method for delivering an implant to a vascular disorder of a patient, comprising the steps of:
(i) advancing a system in proximity to a vascular disorder, the system comprising:
a delivery pusher comprising a proximal end and a distal end and defining a lumen between the proximal and distal ends;
an implant disposed proximate the distal end of the delivery pusher;
a structure extending from the implant, the structure defining an aperture; and
an elongate member extending through the lumen of the delivery pusher, through the aperture of the structure, and into the implant; and
(ii) moving the elongate member to release the implant from the delivery pusher, thereby delivering the implant to the vascular disorder.
11. The method of claim 10 , wherein the distal end of the delivery pusher defines a notch.
12. The method of claim 11 , wherein, prior to step (ii), the aperture of the structure is positioned within the notch of the delivery pusher.
13. The method of claim 10 , wherein the implant comprises an embolic coil.
14. The method of claim 13 , wherein the implant further comprises a cover wound around the embolic coil.
15. The method of claim 14 , wherein the structure is coupled to at least one of the embolic coil and the cover.
16. The method of claim 13 , wherein, prior to step (ii), the elongate member extends into the embolic coil up to at least one of (i) a distance defined by 10 coil loops, (ii) a distance defined by 5 coil loops, and (iii) 1 mm.
17. The method of claim 10 , wherein the structure comprises at least one of a proximal tab, a looped structure, and a hypotube.
18. The method of claim 10 , wherein the elongate member comprises a core wire.
19. The method of claim 10 , wherein moving the elongate member comprises withdrawing the elongate member from the implant and from the aperture of the structure.
20. The method of claim 10 , wherein the vascular disorder comprises a cerebral aneurysm.