A compliant tip reduces the peak pressure of laparoscopic graspers

Background: Previous studies have demonstrated that high pressures are generated at the tips of laparoscopic graspers, which can cause tissue injury. This study examines the effect of a compliant edge on tip pressure. Methods: One of a pair of identical laparoscopic graspers was modified by refashioning the tip out of silicone. A thin film pressure transducer (I-scan 6900 sensor) was deployed between the jaws of the grasper and a simulated tissue (leather strap). Load and handle pressures were kept constant. Peak tip pressure readings were taken as the load orientation was increased from the perpendicular to 135° (n = 10). The data was analysed using ANOVA and a post-hoc Duncan's multiple range test. Results: Peak tip pressures generated by the compliant tipped grasper were significantly less than those developed by the unmodified grasper, particularly at high-load orientations. Conclusion: High pressures generated at the tip of laparoscopic graspers can be reduced by altering the mechanical properties (compliance) of the tip.