title: Experimental results and early clinical experience with an easy method for intracorporeal knot tying using a novel laparoscopic needleholder.
abstract: BACKGROUND
  Intracorporeal suturing and knot tying are among the most difficult procedures in laparoscopic operations. An easy and inexpensive method for intracorporeal instrumental ligation with a modified laparoscopic needle driver is presented.
  
  
  METHODS
  The needle driver developed in this study has a novel mechanism that can fix the suturing thread in a hook at the distal site of the holder's jaw hinge. This hook projects out from the rod only when the jaw of the holder is open. After the needle is removed from the tissue using the grasper, the needle driver is placed under the grasper, which the surgeon manipulates by the left hand. Then the thread is hooked on the needle driver by withdrawal of the driver with the jaw opening. The tip of the needle driver is moved over the shaft of the grasper by keeping the thread on the hook. The thread is entwined during a series of crossing movements of the rods of the forceps. The short tail of the suture material is gripped and tied up as a first throw of ligation. The side edge of the jaw, used for thread cutting, is sharpened by grinding.
  
  
  RESULTS
  When the angle of the forceps is set at 90 degrees in the box trainer, no difference in terms of ligation time and degree of error is observed between the hook and conventional C-loop methods. In the case of the 30 degree forceps angle, the novel method is superior to the conventional method.
  
  
  CONCLUSIONS
  The novel needle driver provides an easy and inexpensive method for performing an intracorporeal ligation, particularly in a case involving a sharp axis angle of the forceps. More clinical experience is necessary for evaluation of this method, but it has potential advantages in laparoscopic operations.
authors.affiliation: Department of General Surgical Science, Gunma University, 3-39-15 Showa-machi, Maebashi, 371-8511, Japan. asaot@med.gunma-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Asao
authors.forename: S
authors.initials: S
authors.lastname: Yamaguchi
authors.forename: S
authors.initials: S
authors.lastname: Tsutsumi
authors.forename: E
authors.initials: E
authors.lastname: Mochiki
authors.forename: H
authors.initials: H
authors.lastname: Kuwano
mesh_terms: D000818:Animals; D020706:Laparoscopes; D010535:Laparoscopy; D008026:Ligation / Q000295:instrumentation / Q000379:methods; D009339:Needles; D013536:Suture Techniques