BESTA: Purse String Suture
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A 15 cm long suture is passed through six markings on a Penrose drain, and three throws are tied in an intracorporeal fashion forming purse string suture. Errors: inaccuracy of needle cuts, improper tying technique, knot insecurity, model avulsion.
The task "Purse String Suture" (Continuous Suture with Intracorporeal Knot Placement).
The task was originally developed for BESTA.
Performance: Shorten the thread of the atraumatic suture till 12-15 cm length (use scale on the box as a sample). Grasp the the thread by the needle-holder in non-dominate hand and introduce suture into the box-trainer. Once inside the trainer, position the needle in the jaws of needle-holder in dominate hand. Pass the needle through the two marks in the tissue (penrose drain). The needle pass through the drain may be done in one motion, or two or more motions. Cut through the next markings till the thread forms a Purse String Suture. Tie the first double throw of a knot intracorporeally, than sequentenly two single throws. Secures each throw onto the drain. At the end of the task, once all three throws have been secured onto the drain, cut both ends of the suture inside the trainer. The ends may be cut together or separately and the tail length is not important for this task. Remove sutures and instruments from the trainer.
Timing for this task begins when your first instrument is visible on the monitor. Timing ends when you withdraw instruments out of the trainer.
- The suture must be grasped by the thread and NOT the needle when introducing it into the trainer.
- Any deviation of the thread from the two marks on the penrose drain.
- The slit in the drain is not properly closed.
- The knot slips or comes apart when tension is applied to the drain.
- The penrose drain avulses or separates from the suture block (failure of the task).
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Time limit (sec): 600 Time target (sec): 190 Number of points: 100 Ambidexterity, %: 50 Evaluated parameters: Formula: 285 - t (sec) - P
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Path, mm Av.Speed, mm/sec Max.Speed, mm/sec
Target values: 100 185 50 - - - - - -