Bypass Mechanism Arm for Single Incisional Laparoscopic Surgery Forceps

Abstract

Single Incisional Laparoscopic Surgery (SILS) is executed through a single 2 cm incision in the navel, it makes forceps touch each other, and doesn't homologize a movement between operational parts and tip forceps parts.

In our research, we develop new type of laparoscopic surgery forceps, "Bypass forceps". Bypass forceps is inserted through navel but brings the operational direction in line with forceps grasping direction by parallel linkage.

We have done designing the links of Bypass Mechanism Arm (BMA), simulating and evaluating motion of BMA, fabricating and verifying prototype forceps. The operation direction of the forceps could not be aligned with the gripping direction. The desired posture and movement were not obtained, and the parallel link mechanism did not become parallel exactly.

As a result, we confirmed that a processing method with a high degree of parallelism was required.