McCullagh P J, McAllister H G, McCaffrey P M, Fox J S, Taggart A J, Riddell J G
Department of Mental Health, Queen's University of Belfast, UK.
J Med Eng Technol. 1988 Jan-Feb;12(1):7-14. doi: 10.3109/03091908809030150.
An automated system for the measurement of peripheral blood flow using venous occlusion plethysmography based on the low-cost Apple II microcomputer, together with purpose-built compressor unit and data acquisition interface, has been developed. The computer performs the dual role of controlling the timing of inflation and deflation of the occluding cuffs and recording the resulting increase in limb circumference. Ten 8 s epochs of data are acquired and analysed per session. Flow rate is computed using a least squares fit between 0.5 and 4.0 s after cuff inflation, giving on-line indication of blood flow. Venous capacitance and digital systolic pressure may be measured using additional algorithms. The system has been used for the investigation of circulatory disorders and in the assessment of drugs acting on the peripheral circulation.
基于低成本的苹果II型微型计算机，开发了一种利用静脉阻断体积描记法测量外周血流的自动化系统，该系统还配备了专门制造的压缩机单元和数据采集接口。计算机发挥双重作用，既控制阻断袖带充气和放气的时间，又记录肢体周长由此产生的增加。每次测量采集并分析10个8秒的数据段。在袖带充气后0.5至4.0秒之间，使用最小二乘法拟合计算流速，实时显示血流情况。静脉容量和数字收缩压可使用其他算法进行测量。该系统已用于循环系统疾病的研究以及作用于外周循环的药物评估。
