Murray R H, Howe N A
Biomed Eng. 1976 May;11(5):180-2.
A patient-isolated calibration system is described for use with catheter transducer physiological pressure measuring apparatus. A subatmospheric calibration pressure is applied to the rear of the transducer diaphragm, the latter isolating the patient hydraulic circuit from the calibration system. The calibration system need not therefore be sterile and remains assembled to the transducer table. Risk of air embolus in the patient and of over-pressurising the transducer during calibration are minimised. Simplification of the hydraulic circuit reduces the chance of air entrapment, improving frequency response and reproducability of results and preparation time is greatly reduced. The system is easy to make and has proved simple, rugged and reliable in use.
描述了一种用于导管换能器生理压力测量设备的患者隔离校准系统。对换能器膜片的后部施加低于大气压的校准压力，该膜片将患者液压回路与校准系统隔离开。因此，校准系统无需无菌，并且保持与换能器台组装在一起。在校准期间，患者发生空气栓塞以及换能器过压的风险降至最低。液压回路的简化减少了空气滞留的机会，改善了频率响应和结果的可重复性，并且大大减少了准备时间。该系统易于制造，并且在使用中已证明简单、坚固且可靠。
