Minimally invasive stitching device
View Patent ↗A stitching device useful for implanting suture in tissue, for example, cartilaginous tissue. The device has a frame and an elongated tubular member mounted thereto. A suture capture needle having a suture capture opening extends from a distal end of the tube. A needle cannula having a lumen is slidably mounted in a passage of the tubular member. Actuation of a trigger member pivotally mounted to the frame moves a distal end of the cannula needle and a section of suture contained in a lumen in the cannula needle through the suture capture opening causing the suture section to be retained in the opening.
1. A tissue stitching device, comprising:
a hollow frame having an interior cavity;
a handle mounted to the frame;
a trigger member pivotally mounted to the handle;
an elongated tube mounted to the frame, said tube having a distal end, a proximal end and an interior passage;
a cannula needle slidably mounted in the cavity of the frame and the passage of the elongated tube, said cannula needle having a proximal end, a distal end, a lumen, an opening in the distal end, a longitudinal axis and a piercing point extending from the distal end;
a needle member mounted in the passage of the elongated tube having a distal end;
a capture needle extending from the distal end of the needle member, said capture needle having a distal piercing point and a suture capture opening, wherein the capture needle is oriented such that the longitudinal axis of the cannula needle intersects the capture opening;
an engagement member slidably mounted in the interior cavity of the frame; and,
a helical spring mounted in the cavity such that compression of the spring provides a proximal biasing force on the engagement member,
wherein the trigger member engages the engagement member, and rotation of the trigger member causes the engagement member and cannula needle to move distally such that the distal end of the cannula needle moves through the suture capture opening.
2. The stitching device of claim 1 , wherein the suture capture opening in the capture needle comprises a keyhole shape.
3. The stitching device of claim 2 , wherein the capture opening comprises a suture engagement slot.
4. The stitching device of claim 1 , additionally comprising an end of a suture mounted in the passage of the cannula needle.
5. The stitching device of claim 1 wherein the capture needle is curved.
6. The stitching device of claim 1 , additionally comprising a suture push rod slidably mounted in the lumen of the cannula needle.
7. The stitching device of claim 1 , wherein a top end of the trigger member comprises a yoke.
8. The stitching device of claim 1 , additionally comprising a support member in the passage of the tube.
9. A method of placing a suture in tissue, comprising:
I. providing a tissue stitching device comprising:
a hollow frame having an interior cavity;
a handle mounted to the frame;
a trigger member pivotally mounted to the handle;
an elongated tube mounted to the frame, said tube having a distal end, a proximal end and an interior passage;
a cannula needle slidably mounted in the cavity of the frame and the passage of the elongated tube, said cannula needle having a proximal end, a distal end, a lumen, an opening in the distal end, a longitudinal axis and a piercing point extending from the distal end;
a needle member mounted in the passage of the elongated tube having a distal end;
a capture needle extending from the distal end of the needle member, said capture needle having a distal piercing point and a suture capture opening, wherein the capture needle is oriented such that the longitudinal axis of the cannula needle intersects the capture opening;
an engagement member slidably mounted in the interior cavity of the frame; and,
a helical spring mounted in the cavity such that compression of the spring provides a proximal biasing force on the engagement member,
wherein the trigger member engages the engagement member, and rotation of the trigger member causes the engagement member and cannula needle to move distally such that the distal end of the cannula needle moves through the suture capture opening;
II. loading an end of a suture in the lumen of the cannula needle
III. moving the capture needle through tissue;
IV. pulling the trigger member to move the distal end of the cannula needle and a section of the suture through tissue such that the section of suture is engaged in part by the suture capture opening; and,
V pulling the device back proximally to pull the capture needle and the section of suture out from the tissue, thereby emplacing a stitch of suture in the tissue.
10. The method of claim 9 , wherein the suture capture opening in the capture needle comprises a keyhole shape.
11. The method of claim 10 , wherein the capture opening comprises a suture engagement slot.
12. The method of claim 9 , wherein the capture needle is curved.
13. The method of claim 9 , wherein the stitching device additionally comprises a suture push rod slidably mounted in the lumen of the cannula needle.
14. The method of claim 9 , wherein a top end of the trigger member comprises a yoke.
15. The method of claim 9 , wherein the stitching device additionally comprises a support member in the passage of the tube.