TY - GEN
T1 - Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment
AU - Chang, Joonho
AU - Freivalds, Andris
AU - Sharkey, Neil A.
AU - Kong, Yong Ku
AU - Kim, Hyun Min
AU - Sung, Kiseok
AU - Kim, Dae Min
N1 - Publisher Copyright:
Copyright 2014 Human Factors and Ergonomics Society.
PY - 2014
Y1 - 2014
N2 - This study determined the optimal trigger grip span for the index finger and contact location between the index finger and trigger, using a cadaver experiment. Three fresh-frozen right male cadaveric hand specimens without any medical problem were employed, and the index finger motion simulator (IFMS), consisting of 1) support frame, 2) force measurement system, 3) motion delivery unit, and 4) operation system, was developed to support and control the specimens. The experiment consisted of two phases: triggering force was observed as a function of 1) grip spans (40, 50, 60 mm) and 2) three contact locations on the middle of the distal to the middle of the medial phalange. Also, three levels of total tendon forces (FDP + FDS: 40, 70, and 100 N) were applied to both phases. As a result, at Phase I, the maximum triggering forces, 8.9, 15.0, and 20.0 N, were obtained at 50 mm grip span for total tendon forces respectively. At Phase II, The contact location on the middle of the medial phalange showed the maximum triggering forces, 10.1, 18.2, and 28.2 N, for the total tendon forces respectively. Force efficiency, triggering force to tendon force ratio, showed approximately 10 to 30% of internal tendon force was converted into external trigger force. On the basis of the results of this study, 50 mm grip span and the contact location on the middle of the medial phalange were recommended for optimal trigger design.
AB - This study determined the optimal trigger grip span for the index finger and contact location between the index finger and trigger, using a cadaver experiment. Three fresh-frozen right male cadaveric hand specimens without any medical problem were employed, and the index finger motion simulator (IFMS), consisting of 1) support frame, 2) force measurement system, 3) motion delivery unit, and 4) operation system, was developed to support and control the specimens. The experiment consisted of two phases: triggering force was observed as a function of 1) grip spans (40, 50, 60 mm) and 2) three contact locations on the middle of the distal to the middle of the medial phalange. Also, three levels of total tendon forces (FDP + FDS: 40, 70, and 100 N) were applied to both phases. As a result, at Phase I, the maximum triggering forces, 8.9, 15.0, and 20.0 N, were obtained at 50 mm grip span for total tendon forces respectively. At Phase II, The contact location on the middle of the medial phalange showed the maximum triggering forces, 10.1, 18.2, and 28.2 N, for the total tendon forces respectively. Force efficiency, triggering force to tendon force ratio, showed approximately 10 to 30% of internal tendon force was converted into external trigger force. On the basis of the results of this study, 50 mm grip span and the contact location on the middle of the medial phalange were recommended for optimal trigger design.
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U2 - 10.1177/1541931214581322
DO - 10.1177/1541931214581322
M3 - Conference contribution
AN - SCOPUS:84957712060
T3 - Proceedings of the Human Factors and Ergonomics Society
SP - 1546
EP - 1550
BT - 2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014
PB - Human Factors an Ergonomics Society Inc.
T2 - 58th International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014
Y2 - 27 October 2014 through 31 October 2014
ER -