The laparoscopic instruments cause pain, numbness and damages to surgeons during the operation due to poor ergonomic design. Anthropometry is one of the most important factors in ergonomic design. Six hand dimensions have been measured in gripping position of fourteen subjects. A prototype handle was designed based on those anthropometric data and finally manufactured. In this study, surface EMG and angels of wrist during a simulated laparoscopic task were collected to evaluate the usability of the new designed and an available handle. After the task, a questionnaire was used to assess the comfort level of those handles subjectively. The compare of those physiological signals showed that the prototype was superior in ergonomic design. Regarding to the questionnaire, the prototype handle scored 58.08, and the current handle scored 52.22. The results showed that the prototype handle is more ergonomic designed than the current handle.
A surface pressure distribution test system of a doctor’s hand during a laparoscopic surgery based on LabVIEW was designed. The principle was that real time acquisition of data signal on multi-channel sensors, and using data acquisition card to get the feed back voltage signal from these pressure sensors, and then transferred to a PC. The test system had realized the real time processing and display of the signal on LabVIEW. The pressure detection range was 0-210g. The system could detect the surface pressure real time of the part of a doctor’s hand which contacting the surface of handle during the laparoscopic surgical procedure. This system could also make quantitative evaluation of the contact pressure on the handle of the laparoscopic instruments and provide a reference to ergonomics design of the handle.
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