血流量測定による褥瘡発症因子としての圧力とずれ力の相互作用(<特集>生体医工学シンポジウム2005)

概要

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Pressure ulcers are an ischemic necrosis caused by sustained mechanical loads. We measured blood flow using a laser Doppler flowmeter to investigate the quantitative relationship between pressure and shear force on the body surface. Constant pressure and shear force were applied to the forearm (A: soft tissue) and processus styloideus ulnae (B: bony prominence) using a pneumatic pressure device attached to a measurement probe. In the case of A, blood flow decreased as pressure load was increased. It is possible that there is a several-fold force in bony prominence for the comparison of B (50mmHg) with A (100mmHg). If shear force is applied, the shear force (0.9N/cm^2) might be approximately equivalent to the pressure (50mmHg) under the comparison condition of A (50mmHg and 0.9N/cm^2) with A (100mmHg). These results suggest that the reduction of shear force against the tissue surface is essential to prevent the crisis of pressure ulcers in addition to normal pressure.
社団法人日本生体医工学会の論文
2006-03-10