dos Santos Icaro, Shah Jignesh, Ferreira da Rocha Adson, Webster John G, Valvano Jonathan W
Department of Electrical and Computer Engineering, University of Texas at Austin, CO803, Austin, TX 78712, USA.
Physiol Meas. 2003 May;24(2):321-35. doi: 10.1088/0967-3334/24/2/308.
This work describes the fundamentals and calibration procedure of an instrument for in vivo evaluation of the heat convection coefficient between the endocardium and the circulating blood flow. The instrument is to be used immediately before radio-frequency cardiac ablation is performed. Thus, this instrument provides researchers with a valuable parameter to predict lesion size to be achieved by the procedure. The probe is a thermistor mounted in a Swan-Ganz catheter, and it is driven by a constant-temperature anemometer circuit. A 1D model of the sensor behaviour in a convective medium, the calibration procedure and the apparatus are explained in detail. Finally, a performance analysis of the instrument in the range of 200-3500 W m(-2) K(-1) shows that the average absolute error of full scale is 7.4%.
这项工作描述了一种用于体内评估心内膜与循环血流之间热对流系数的仪器的基本原理和校准程序。该仪器将在进行射频心脏消融术前立即使用。因此，该仪器为研究人员提供了一个有价值的参数，用于预测该手术可实现的损伤大小。探头是安装在 Swan-Ganz 导管中的热敏电阻，由恒温风速计电路驱动。详细解释了对流介质中传感器行为的一维模型、校准程序和仪器。最后，在 200 - 3500 W m(-2) K(-1) 范围内对该仪器进行的性能分析表明，满量程的平均绝对误差为 7.4%。
