Computer-controlled cardiopulmonary bypass system

✍ Scribed by Toshiyuki Beppu; Yasuharu Imai; Yasuhiro Fukui

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 830 KB
• Volume: 23
• Category: Article
• ISSN: 0882-1666
• DOI: 10.1002/scj.4690231107

✦ Synopsis

Abstract

To improve the safety of a cardiopulmonary bypass (CPB), the authors developed a pump control system that uses a microcomputer. The system consists of a microcomputer (NEC PC9801), 12‐bit A/D converter, infusion pump, withdrawal pump, reservoir sensor, and collapse sensor. The computer controls both pumps and regulates central venous pressure (CVP) to maintain the amount of blood in the patient's body at constant.

A digital proportional‐integral (PI) control with a sampling period of 1 s is adopted for CVP controller; the control gain is determined experimentally. A screening algorithm is devised to remove artifacts introduced to the CVP measurement. This system was used in ten cases of infants with congenital heart disease, where CVP was controlled satisfactorily for all cases with no unstable operation. Most of the changes in the CVP caused by surgical manipulation were detected by the screening algorithm. Additionally, the blood balance during CPB was maintained satisfactorily. This system is useful for the improvement of the safety of CPB.