Insufficient joint forces of first-generation articulating instruments for laparoendoscopic single-site surgery

Area of Science:

• Minimally Invasive Surgery
• Surgical Instrumentation
• Biomechanics

Background:

• Current articulating instruments for laparoendoscopic single-site surgery may not provide adequate joint forces.
• Assessing the joint forces of first-generation articulating laparoscopic instruments is crucial.
• Understanding forces needed for secure surgical ties in vivo is essential.

Purpose of the Study:

• To measure the joint forces of first-generation articulating laparoscopic instruments.
• To compare these forces with those required for secure surgical ties in an animal model.

Main Methods:

• Tested Laparo-Angle, RealHand, and Roticulator articulating instruments.
• Measured articulating forces at neutral and fully articulated positions using a push-pull gauge.
• Evaluated forces for securing surgical ties on pig ureter, renal artery, and renal vein.

Main Results:

• Bending forces to 30° were 5.6 ± 1.2 N (Laparo-Angle) and 4.7 ± 1.0 N (RealHand).
• Slippage forces in the fully articulated state ranged from 1.5 to 1.8 N.
• Mean forces for surgical ties were 14.5 ± 2.3 N (ureter), 11.5 ± 0.8 N (renal artery), and 10.3 ± 2.3 N (renal vein).

Conclusions:

• First-generation articulating instruments exhibit insufficient joint forces for typical surgical needs.
• Development of articulating instruments with enhanced articulating forces is recommended.
• Improved instrument design is necessary for effective laparoendoscopic single-site surgery.