Systems and methods for suture delivery
Systems and methods are provided for suturing tissue. An elongated deployment shaft carries a needle deployment assembly with needles carrying suture material. A needle catcher is disposed over the shaft and configured to engage and retain at least a portion of each of the needles carrying the suture material when the needles are passed through the tissue to be sutured to a proximal position.
1. A suture delivery device for suturing an opening on tissue comprising:
an elongated deployment shaft including at least one ramp;
a needle deployment assembly carried by the shaft, including a plurality of needles carrying suture material configured to have an insertion profile at a distal position and contact the at least one ramp to deflect radially outwards to a piercing angle when moved proximally relative to the shaft; and
a catcher disposed over the shaft configured to retain at least a portion of each of the plurality of needles carrying the suture material when the plurality of needles are passed through the tissue to be sutured to a proximal position that engages the catcher.
2. The suture delivery device of claim 1 , wherein the catcher is made of resilient material.
3. The suture delivery device of claim 1 , wherein the catcher is expandable.
4. The suture delivery device of claim 1 , wherein each of the plurality of needles comprises a needle base and a detachable needle tip that carries the suture material, such that each needle tip engages the catcher when the plurality of needles are moved to the proximal position and the catcher retains each needle tip when each of the needle bases are returned to the distal position.
5. The suture delivery device of claim 4 , wherein a dimension of the needle tip is different from a dimension of the needle base.
6. The suture delivery device of claim 4 , wherein each needle base and corresponding needle tip is configured to have a retention force to keep the needle tips in position on the needle bases until moved proximally into engagement with the catcher.
7. The suture delivery device of claim 6 , wherein the retention force depends at least in part on a surface treatment.
8. The suture delivery device of claim 7 , wherein the surface treatment is a layer of nitinol oxide.
9. The suture delivery device of claim 1 , further comprising a sheath coaxially disposed over the catcher, wherein a distal end of the sheath cooperates with the catcher to engage the needles when in the proximal position.
10. The suture delivery device of claim 1 , further comprising a handle at a proximal end of the shaft, wherein the handle has an actuator configured to move the needles proximally and distally relative to the shaft.
11. A method for delivering a suture comprising:
providing an elongated deployment shaft including at least one ramp, a needle deployment assembly carried by the shaft, including a plurality of needles carrying suture material and a catcher coaxially disposed over the shaft;
advancing the elongated deployment shaft to a desired position in a body;
deflecting the plurality of needles radially outwards to a piercing angle from an insertion profile at a distal position with proximal movement relative to the shaft to contact the at least first ramp;
engaging the catcher with the plurality of needles when moved to a proximal position by passing through the tissue to be sutured;
retaining at least a portion of each of the plurality of needles carrying the suture material with the catcher; and
returning a portion of each of the plurality of needles not retained by the needles to the insertion profile at the distal position.
12. The method of claim 11 , wherein deflecting the plurality of needles radially outward, engaging the catcher with the plurality of needles and returning a portion of each of the plurality of needles not retained by the catcher to the distal position is performed by operating an actuator at a proximal end of the elongated deployment shaft.
13. The method claim 12 , wherein each of the plurality of needles comprises a needle base and a detachable needle tip that carries the suture material, such that each needle tip engages the catcher when the plurality of needles are moved to the proximal position and the catcher retains each needle tip when each of the needle bases are returned to the distal position.
14. The method of claim 13 , wherein each needle base and corresponding needle tip is configured to have a retention force to keep the needle tips in position on the needle bases until moved proximally into engagement with the catcher.
15. The method of claim 14 , wherein the retention force depends at least in part on a surface treatment.
16. The method of claim 11 , wherein a sheath coaxially disposed over the catcher includes a distal end that cooperates with the catcher to engage the needles when in the proximal position.
17. The method of claim 11 , further actuating a handle at a proximal end of the shaft to move the needles proximally and distally relative to the shaft.