Juntendo Medical Journal
Online ISSN : 2188-2134
Print ISSN : 0022-6769
ISSN-L : 0022-6769
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Volume 19, Issue 3
Displaying 1-25 of 25 articles from this issue
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  • Study on the Pressure Distribution on the Each Finger-tip during Gripping
    RISSHI IMAI
    1973 Volume 19 Issue 3 Pages 412-430
    Published: September 10, 1973
    Released on J-STAGE: November 22, 2014
    DOIhttps://doi.org/10.14789/pjmj.19.412
    JOURNAL FREE ACCESS
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    Purpose of the study : Many studies have been reported on the dynamic function of the hand mainly based on maximum power grip. However, it might be also important to estimate the power applied during fine gripping to analyse minimum necessary power automatically exerted in daily activities. This study was carried out to measure the pressure distribution on the each finger-tip while holding an object of a given weight under normal and pathologic conditions. Method : A handpiece was made with modelling compound to fit the hand to be examined. Five miniature pressure transducers (Kyowa PS 10 KB) were then imbedded in the handpiece where the finger-tips were located during gripping. Weight ranging from one to five kilograms was added to this handpiece. The pressure was recorded through a 6-channel dynamic strain meter. The pressure was measured during gripping with maximum power and lifting up the weight in both normal and anesthetized conditions. Results : 1. The subjects examined were classified to two groups accoding to the pressure patterns on the fingers during maximum power gripping : one group with the maximum pressure on the index finger-tip and another on the thumb. 2. The total pressure on the thumb, the index and the long fingers occupied approximately 75% of the total pressure on the all fingers. 3. The pressure on the thumb and that on the index and the long fingers seemed to compensate each other. 4. Marked decrease of the pressure was found in the anesthetized hand with ulnar and/or median nerve block on maximum power gripping. 5. The pressure increased with the increase of the weight lifted by both the normal and the anesthetized hands, although there was no linear correlation between them. 6. The pressure increased in the anesthetized hand was more pronounced, but tended to fluctuate more than the normal hand. It was more apparent with eyes blindfolded. 7. When an object was rapidly lifted up the excessive pressure was first noted and then the pressure gradually became constant. The time while the pressure reach this stable state did not significantly differ between the cases tested by the normal and by the anesthetized hands.
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