自制心输出量模拟装置

Barry designed and build a Cardiac Output Computer Simulator some years ago. It works well, is cheap and not too difficult to build. Here his instructions:

Do-it-yourself Cardiac Output Computer Simulator created by Barry Voss

Overview of the Thermodilution Cardiac Output Computer Simulator
In clinical practice cardiac output can be estimated with the thermodilution method. A catheter is insertedinto the pulmonary artery. The catheter has a thermistor in the tip measuring the temperature of the blood.A second thermistor is inserted into a bag of saline to measure its temperature (the saline is the injectate).The injectate is typically room temperature or iced saline (0 degrees centigrade). On the cardiac outputcomputer the user enters a 'constant'. This is a number determined by the manufacturer that tells thecomputer the temperature of the injectate, and the volume of the injectate over a prescribed period oftime. The constant is a number that the user looks up on a chart provided by the manufacturer. A typicalinjectate volume would be 10 ml, and a typical time would be 3 seconds. The user presses a 'startmeasurement' button on the computer and delivers the injectate via syringe into the catheter and thus intothe artery of the patient. The thermistor at the tip of the catheter measures the temperature differential ofthe blood/saline over time and performs a calculation estimating the cardiac output. Cardiac outputtypically run in the 3 to 8 liters per minute range. This process is very technique dependant so threemeasurements are done to get a good average.

Cardiac output is measured by placing a catheter with a thermistor on the tip through the rightventricle into the pulmonary artery, injecting cold saline into the catheter, and integrating theresulting pulmonary artery temperature profile...


这是心输出量的DIY制作PDF，里面包含电路图和元件规格清单，以及计算公式和调整方法。

这是心输出量的一种测量方法。
下面是演示监护心输出量检测的视频，是油管的，我找了个网站给转换下载下来。

这也是国外同行的DIY小制作，许多监护都带有心输出量检测，在维修过程中只能接到人体才能检测。所以想出了用模拟器的办法，手工只做了一个。模拟器的输出量可达到3-8L每分钟。有PDF文件的制作过程，有兴趣可以看一下。

谢谢楼主的分享，非常实用。

谢谢楼主，实际做做，看看效果，对维修是否有帮助

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