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Obesity Surgery

Knotmaker-with-curved-elongate-member-used-in-tying-a-ligature

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Knotmaker with curved elongate member used in tying a ligature

Details

Inventors: de la Torre, Roger A.; Scott, James Stephen; Jerivs, James E.; Mollenauer, Kenneth H.;
Assignee: General Surgical Innovations, Inc. (Cupertino, CA)
Primary Examiner: Schmidt; Jeffrey A.
Assistant Examiner:
Attorney, Agent or Firm: Howell & Haferkamp, L.C.

A surgical instrument facilitates tying of a knot in a length of suture material at a remote surgical location. The instrument is comprised of an inner rod having a length of suture wrapped over the rod in a particular pattern. A needle may be secured to a free end of the suture and the pattern of wrapping the suture on the rod enables loops of suture to move off the rod end and over the needle to form a knot in the suture. The inner rod is received in an interior bore of an outer rod for manually controlled reciprocating movement therein. The inner rod is manually retracted into the interior bore of the outer rod to cause the outer rod to move the loops of suture off the inner rod end and over the needle in forming a knot in the suture. An extendable filament is contained in the inner rod and has a connector at its distal end for holding the free end of the suture. The distal end is curved, so that extending the filament from the inner rod causes it to pass the suture around and behind a tissue to be ligated where the suture may be taken from the filament by a grasper. Pairs of prongs are also provided on the distal ends of the inner and outer rods for sequentially ejecting pre-tied suture knots off the distal end of the inner rod.

DETAILED DESCRIPTION The present invention overcomes disadvantages commonly associated with prior art surgical knot-tying instruments by providing a simplified surgical instrument for tying a knot in a length of suture proximate to a surgical site.
More specifically, the surgical instrument of the present invention may be employed in either open incision or laparoscopic surgery procedures to position a needle and a length of suture material proximate to a surgical location and to form one or more stitches with the length of suture material at the surgical location, and then to tie a knot in the length of suture material at the surgical location.
Alternatively, the instrument of the invention may be used to position a length of suture at a surgical location and assist in forming a ligature in the length of suture.
A first embodiment of the instrument is basically comprised of an elongate rod having opposite first and second ends.
The longitudinal length of the rod is designed to enable the first end of the rod to be inserted through a conventional, laparoscopic trocar to position the rod first end proximate to a surgical location or site within a body cavity accessible by the trocar.
The second end of the rod projects from the trocar where it is grasped manually to enable manipulation of the rod first end within the body cavity.
The rod has a first interior bore extending through the rod between its opposite ends, and a second interior bore that also extends through the rod between its opposite ends.
An interior wall extending through the rod separates the first interior bore from the second interior bore.
The second interior bore has a larger cross-sectional area than the first interior bore and is dimensioned sufficiently large to enable insertion of conventional laparoscopic surgical instruments, for example a surgical grasper, therethrough.
An elongate, flexible and resilient filament extends through the first interior bore of the rod.
The filament has opposite proximal and distal ends that project from the opposite proximal and distal ends of the rod, respectively

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