School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology
A new type of electric stapler is developed to solve the problems of insufficient rotation angle, inconve nient operation and difficulty in grasping the pressing strength of existing products. Methods: An electric stapler was designed and machined. the motion trajectory curve of the prototype was measured by using the three-coordinate imaging instrument to build the functional test platform of the prototype, and the goodness of fit was used to evaluate the consistency between the theoretical curve and the measured curve. The fresh pig's small intestine tissues were anastomosed at the front end of different bending angles, and the forming rate of the anastomotic stoma was measured. Result: The goodness of fit between the test curve and the theoretical curve of turning motion and shooting motion was ideal, while the goodness of fit between the test curve and the theoretical curve of pressing motion was not ideal when the turning joint was bent at 0 degrees, and was ideal when it was bent at 15 degrees to 60 degrees. In the performance test, the deformity rate of the nail was less than 1.14%, which indicated that the bending angle had no significant effect on the anastomotic effect. Conclusion: The kinematics curves of shooting and turning motion are consistent with theoretical curves. The pressing motion curves fluctuates at different bending angles, but does not affect the anastomotic effect, and the effect of the electric stapler meets the clinical requirements.