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 device for delivering an implant to a vascular disorder of a patient, comprising:
a delivery pusher comprising a proximal end and a distal end and defining a first lumen between the proximal and distal ends;
a detachment handle, coupled to the proximal end of the delivery pusher, for initiating a mechanical release of an implant coupled to the distal end of the delivery pusher when the implant is placed in proximity to a vascular disorder, the detachment handle comprising an engagement mechanism defining a second lumen; and
a first elongate member extending from a distal end of the first lumen, along the first and second lumens, and beyond a proximal end of the engagement mechanism by a first distance, thereby allowing the engagement mechanism to move towards a proximal end of the first elongate member by the first distance prior to engaging the proximal end of the first elongate member.
2. The device of claim 1 , wherein the first elongate member comprises a core wire.
3. The device of claim 1 , wherein the detachment handle comprises a handle slider and further wherein the engagement mechanism is disposed within the handle slider.
4. The device of claim 1 , wherein the engagement mechanism comprises a hypotube.
5. The device of claim 1 further comprising an engagement member coupled to the proximal end of the first elongate member.
6. The device of claim 5 , wherein the engagement member is selected from the group consisting of a tube and a coil.
7. A method for delivering an implant to a vascular disorder of a patient, comprising the steps of:
advancing the implant, via a delivery pusher comprising a proximal end and a distal end and defining a first lumen between the proximal and distal ends, in proximity to the vascular disorder, the delivery pusher being coupled at its proximal end to a detachment handle and at its distal end to the implant, the detachment handle comprising an engagement mechanism defining a second lumen; and
manipulating at least a portion of the detachment handle to engage a proximal end of a first elongate member with the engagement mechanism and to thereby initiate a mechanical release of the implant from the distal end of the delivery pusher, the first elongate member extending from a distal end of the first lumen, along the first and second lumens, and beyond a proximal end of the engagement mechanism by a first distance prior to being engaged by the engagement mechanism, thereby allowing the engagement mechanism to move towards the proximal end of the first elongate member by the first distance prior to engaging the proximal end of the first elongate member.
8. The method of claim 7 , wherein the first elongate member comprises a core wire.
9. The method of claim 7 , wherein the manipulated portion of the detachment handle comprises a handle slider and further wherein the engagement mechanism is disposed within the handle slider.
10. The method of claim 7 , wherein the engagement mechanism comprises a hypotube.
11. The method of claim 7 , wherein the implant comprises an embolic coil.
12. The method of claim 11 , wherein the implant further comprises at least one of a proximal tab and a suture loop adapted to couple a proximal end of the embolic coil to the distal end of the delivery pusher.