Suture loop closure device
View Patent ↗The present invention describes apparatus and methods for tying a filament across subcutaneous punctures. According to some embodiments, the apparatus and methods provide pre-tied knots that are inserted into a bodily lumen. Needles flanking the subcutaneous puncture are inserted into the lumen and grab the pre-tied knots. The pre-tied knots are pulled through tiny holes flanking the subcutaneous puncture by the needles, leaving an internal length of the filament across the subcutaneous puncture. The filament is then externally tied, closing the subcutaneous puncture.
1. A tissue puncture closure device, comprising:
a carrier tube having first and second end portions and a slotted portion disposed between the first and second end portions, the carrier tube defining a lumen;
a filament extending from the first end portion to the second end portion; the filament including
lumen of the first and second open loop knots disposed at least partially within the slotted portion;
wherein the slotted portion extends longitudinally along the lumen, the lumen of the slotted portion comprising first, second, third, and fourth slots arranged around a circumference of the carrier tube with the first and second slots arranged 180 degrees from each other and the third and fourth slots arranged 180 degrees from each other;
first and second needles arranged to extend from outside the carrier tube through the first and second slots into the first and second open loop knots to grasp the first and second open loop knots.
2. A tissue puncture closure device according to claim 1 wherein the first and second slots are elongated slots.
3. A tissue puncture closure device according to claim 1 wherein the third and fourth slots comprise a smaller width than the first and second slots.
4. A tissue puncture closure device according to claim 1 wherein the third and fourth slots comprise a smaller width than the first and second slots, wherein first portions of the first and second open loop knots extend at least partially through the third slot, and second portions of the first and second open loop knots extend at least partially through the fourth slot.
5. A tissue puncture closure device according to claim 1 wherein the first, second, third, and fourth slots are arranged at approximately 90 degree intervals around the circumference of the carrier tube.
6. A tissue puncture closure device according to claim 1 wherein the central shaft extends through a vascular access sheath, and wherein:
the first needle includes a first curved needle that extends through a first side port in the vascular access sheath, into the slotted portion, and at least partially through the first open loop knot,
the second needle includes a second curved needle that extends through a second side port in the vascular access sheath, into the slotted portion, and at least partially through the second open loop knot.
7. A tissue puncture closure device according to claim 1 wherein the central shaft extends through a vascular access sheath, and wherein:
the first needle includes a first cannula needle that extends through a first side port in the vascular access sheath and diverges from the vascular access sheath, and a first shape-memory needle that passes through the first cannula needle, curves into the slotted portion, and extends at least partially through the first open loop knot;
the second needle includes a second cannula needle that extends through a second side port in the vascular access sheath and diverges from the vascular access sheath and a second shape-memory needle that extends through the second cannula needle, curves into the slotted portion, and extends at least partially through the second open loop knot.
8. A tissue puncture closure device according to claim 1 wherein the first and second open loop knots are remotely tightenable.
9. A tissue puncture closure device according to claim 1 wherein the first and second open loop knots are spaced from each other axially with respect to the central shaft.
10. A tissue puncture closure device according to claim 1 wherein the filament extends from the second portion back to the first portion in a loop.
11. A tissue puncture closure device, according to claim 1 wherein the first open loop knot is spaced distal of the second open loop knot.