Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment

Joonho Chang, Andris Freivalds, Neil Sharkey, Yong Ku Kong, Hyun-Min Mike Kim, Kiseok Sung, Dae Min Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publication2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014
PublisherHuman Factors an Ergonomics Society Inc.
Pages1546-1550
Number of pages5
ISBN (Electronic)9780945289456
DOIs
StatePublished - Jan 1 2014
Event58th International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014 - Chicago, United States
Duration: Oct 27 2014Oct 31 2014

Publication series

NameProceedings of the Human Factors and Ergonomics Society
Volume2014-January
ISSN (Print)1071-1813

Other

Other58th International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014
CountryUnited States
CityChicago
Period10/27/1410/31/14

Fingerprint

Tendons
contact
experiment
Experiments
Force measurement
Medical problems
efficiency
Simulators

All Science Journal Classification (ASJC) codes

  • Human Factors and Ergonomics

Cite this

Chang, J., Freivalds, A., Sharkey, N., Kong, Y. K., Kim, H-M. M., Sung, K., & Kim, D. M. (2014). Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment. In 2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014 (pp. 1546-1550). (Proceedings of the Human Factors and Ergonomics Society; Vol. 2014-January). Human Factors an Ergonomics Society Inc.. https://doi.org/10.1177/1541931214581322
Chang, Joonho ; Freivalds, Andris ; Sharkey, Neil ; Kong, Yong Ku ; Kim, Hyun-Min Mike ; Sung, Kiseok ; Kim, Dae Min. / Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment. 2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014. Human Factors an Ergonomics Society Inc., 2014. pp. 1546-1550 (Proceedings of the Human Factors and Ergonomics Society).
@inproceedings{2876c79b0ed8460ebc4efea14ff10ec7,
title = "Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment",
abstract = "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.",
author = "Joonho Chang and Andris Freivalds and Neil Sharkey and Kong, {Yong Ku} and Kim, {Hyun-Min Mike} and Kiseok Sung and Kim, {Dae Min}",
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Chang, J, Freivalds, A, Sharkey, N, Kong, YK, Kim, H-MM, Sung, K & Kim, DM 2014, Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment. in 2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014. Proceedings of the Human Factors and Ergonomics Society, vol. 2014-January, Human Factors an Ergonomics Society Inc., pp. 1546-1550, 58th International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014, Chicago, United States, 10/27/14. https://doi.org/10.1177/1541931214581322

Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment. / Chang, Joonho; Freivalds, Andris; Sharkey, Neil; Kong, Yong Ku; Kim, Hyun-Min Mike; Sung, Kiseok; Kim, Dae Min.

2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014. Human Factors an Ergonomics Society Inc., 2014. p. 1546-1550 (Proceedings of the Human Factors and Ergonomics Society; Vol. 2014-January).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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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.

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Chang J, Freivalds A, Sharkey N, Kong YK, Kim H-MM, Sung K et al. Investigation of triggering force by the index finger for optimal trigger design using a cadaver experiment. In 2014 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2014. Human Factors an Ergonomics Society Inc. 2014. p. 1546-1550. (Proceedings of the Human Factors and Ergonomics Society). https://doi.org/10.1177/1541931214581322