Anchoring delivery system and methods
An anchoring delivery system for use in an intracranial artery is provided including a tethering device having an elongated tether and an anchor coupled to a distal end of the tether. The anchor is deployable from a low profile configuration to a higher profile configuration to fix the distal end of the tether at an anchoring site in an anchoring vessel. The tethering device is configured to be used with a guide-sheath having a lumen configured to receive the tether. Related devices, systems, and methods are also described.
1. A catheter system for use to deliver a working device to an intracranial artery, the catheter system comprising:
a tethering device comprising:
an elongated tether having a distal end and a proximal end; and
an anchor coupled to the distal end of the tether, the anchor deployable from a low profile configuration to a higher profile configuration to fix the distal end of the tether at an anchoring site in an anchoring vessel; and
a guide-sheath comprising:
a tether lumen configured to receive the tethering device, the tether lumen communicating with a tether port near a distal end of the guide-sheath;
a working lumen extending from a proximal end of the guide sheath to a mouth at or near the distal end of the guide sheath, the working lumen configured to deliver a working device; and
a deflecting surface near the distal end of the guide sheath, the deflecting surface located between the working lumen and the tether lumen, and positioned oblique to the working lumen; and
a point of fixation located proximal to the anchoring site, wherein the guide-sheath is reversibly attachable to the elongated tether at the point of fixation, and
wherein, when the anchor is deployed at the anchoring site and the guide-sheath is attached to the elongated tether at the point of fixation, delivery of the working device through the working lumen tensions the elongated tether between the anchoring site and the point of fixation.
2. The catheter system of claim 1 , wherein the tether lumen is separate from the working lumen.
3. The catheter system of claim 1 , wherein the tether lumen extends from the tether port to a tether gripper at the point of fixation.
4. The catheter system of claim 1 , wherein the anchor in the higher profile configuration engages an anchoring anatomy and resists a proximal pull on the tether.
5. The catheter system of claim 1 , wherein the tether is an elongated member extending from a proximal end to a distal joint that attaches to the anchor.
6. The catheter system of claim 5 , wherein the distal joint removably attaches the tether to the anchor.
7. The catheter system of claim 5 , wherein the distal joint fixedly attaches the tether to the anchor.
8. The catheter system of claim 1 , wherein the tether has a cross-sectional diameter that varies along a length of the tether.
9. The catheter system of claim 1 , wherein the anchor automatically self-expands from the low profile configuration to a higher profile configuration when the anchor is unconstrained.
10. The catheter system of claim 1 , wherein the anchor does not automatically self-expand from the low profile configuration to a higher profile configuration when the anchor is unconstrained.
11. The catheter system of claim 1 , wherein the tether includes an anchor wire extending through a runner tube such that a withdrawal load applied to the anchor wire causes the anchor wire to move relative to the runner tube and the anchor to transition to the low profile configuration.
12. The catheter system of claim 1 , wherein the anchor includes several convoluted struts.
13. The catheter system of claim 1 , wherein the anchor is a coiled wire.
14. The catheter system of claim 1 , wherein the anchor is a curved wire.
15. The catheter system of claim 1 , further comprising a pusher tube slidably positioned over the tether.