Wang J J, Drzewiecki G, Li J K, Kedem J
Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855-0909, USA.
Biomed Instrum Technol. 1997 Mar-Apr;31(2):155-63.
A novel force transducer was designed to measure the circumferential regional force developed in the ventricular myocardium in vivo. The transducer is composed of a frame, a carrier bar, and a cantilever spring. Two resistance strain gauges embedded on the spring serve as force-sensing elements. The output of a Wheatstone-bridge circuit, containing these two gauges and a temperature compensation resistor, is connected to a preamplifier. The main advantages of this prototype include the initial stretch-adjustment ability (physiologic 0) low temperature drift, high linearity (r = 0.99) with loads ranging from 0 to 100 g, and moderate sensitivity of 0.232 mV/V/g at room temperature. The transducer was validated with in-vivo canine experiments. The experimental results showed that this transducer can be used to reliably measure the myocardial force development during altered cardiac conditions, such as myocardial stunning and myocardial ischemia.
设计了一种新型力传感器，用于测量活体心室心肌中产生的圆周区域力。该传感器由一个框架、一个承载杆和一个悬臂弹簧组成。嵌入弹簧的两个电阻应变片用作力传感元件。包含这两个应变片和一个温度补偿电阻的惠斯通电桥电路的输出连接到一个前置放大器。该原型的主要优点包括初始拉伸调节能力（生理零点）、低温漂移、在0至100克负载范围内具有高线性（r = 0.99）以及在室温下具有0.232 mV/V/g的适度灵敏度。该传感器通过体内犬实验进行了验证。实验结果表明，该传感器可用于可靠地测量心脏状况改变（如心肌顿抑和心肌缺血）期间的心肌力发展。
