ARM POSTURE AND MUSCULAR ACTIVITY WHILE INSERTINGAND AIMING WITH LAPAROSCOPIC TOOLS

摘要

Two laparoscopic tools, a scissor-type grasper and an ergonomically designed grasper, werecompared in terms of arm posture and muscle activity during insertion into a trocar and during astandardized aiming task. Participants were asked to insert a laparoscopic tool into a simulatedabdomen and hit five cross-shaped targets using their dominant hand; similar to reaching an organduring laparoscopic surgery. Twenty-six right-handed novice participants volunteered for thestudy. Two electrogoniometers were used to measure wrist flexion/extension, wrist deviation, ande elbow flexion/extension angles. Six surface elect electrodes were used to measure %MVE of wristflexors, wrist extensors, biceps brachii, triceps brachii, deltoid, and upper trapezius. Theconditions used were five target positions, two touch screen monitor angles, and five handpostures. The scissors-type tool caused the largest wrist flexion, but the smallest %MVE from thewrist flexors. The method of gripping the tools was the most important factor determining jointangles and muscular load during the insertion and aiming tasks.