钳齿形貌对腹腔镜夹钳安全性的影响

Objective To analyze the clamping capabilities of laparoscopic graspers with different teeth profiles during tissue clamping operation, thereby providing valuable reference for the design of grasper. Methods ANSYS was used for finite element analysis. The relationships between the compression and the traction effect of 4 kinds of teeth profiles (trapezoidal, nail-shaped, right-angled wedge-shaped and isosceles wedge-shaped) were compared, and the reasons for different clamping capabilities were analyzed by strain nephogram. Taking the tissue clamping without damages or slippage as the standard, the clamping capabilities of different teeth profiles were evaluated. Results The right-angled wedge-shaped teeth had the best ability to clamp tissues, while the nail-shaped teeth caused damages to tissues easily and had the worst traction performance. The trapezoidal teeth and isosceles wedge-shaped teeth had similar traction performances, but the compression of isosceles wedge-shaped teeth was better. Moreover, the teeth number had obvious effects on traction performance. Conclusion The clamping capability of laparoscopic grasper depends on the profile and number of teeth; and the safety of clamping tissues by laparoscopic grasper is determined by peak stress and clamping capability. The teeth profile with a high peak stress does not mean that the grasper has a strong capability of tissue clamping, and the capability of clamp deformation should be considered in the evaluation of traction capability.