In laparoscopic surgery, large traditional instruments for abdominal surgery cannot be utilized because they cannot pass through a trocar. To overcome this problem, we have proposed assemblable instruments for laparoscopic surgery that can be disassembled to pass through a trocar and assembled inside the abdominal cavity to become large instruments. As an example, we have developed an assemblable pursestring suture instrument (PSI) for laparoscopic surgery. Some parts of the assemblable PSI have small and complicated shapes but they must hold large forces. So we applied FEM to the CAD model to estimate the strength of the parts.
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