An Operating Point Control System for a Continuous-Flow Artificial Heart

Kosaka, Ryo; Yanagi, Kennichi; Sato, Tomoaki; Itoh, Hiroshi; Ichikawa, Shuhei; Motomura, Tadashi; Kawahito, S.; Mikami, Masayuki; Linneweber, Joerg; Nonaka, Kenji; Takano, T.; Glueck, Julie; Sankai, Y.; Nosé, Yukihiko

doi:10.1097/00002480-200103000-00166

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“…3 [5]. The mock circulation loop was composed of a specially constructed pulsatile pump with two plastic valves that modeled a natural heart, two compliance chambers that modeled aortic and venous compliance chamber, and a rotating clamp that modeled the total peripheral resistance.…”

Section: Evaluation Test Using a Mock Circulation Loopmentioning

confidence: 99%

Noninvasive blood-flow meter using a curved cannula with zero compensation for an axial flow blood pump

Kosaka

Fukuda

Nishida

et al. 2013

2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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In order to monitor the condition of a patient using a left ventricular assist system (LVAS), blood flow should be measured. However, the reliable determination of blood-flow rate has not been established. The purpose of the present study is to develop a noninvasive blood-flow meter using a curved cannula with zero compensation for an axial flow blood pump. The flow meter uses the centrifugal force generated by the flow rate in the curved cannula. Two strain gauges served as sensors. The first gauges were attached to the curved area to measure static pressure and centrifugal force, and the second gauges were attached to straight area to measure static pressure. The flow rate was determined by the differences in output from the two gauges. The zero compensation was constructed based on the consideration that the flow rate could be estimated during the initial driving condition and the ventricular suction condition without using the flow meter. A mock circulation loop was constructed in order to evaluate the measurement performance of the developed flow meter with zero compensation. As a result, the zero compensation worked effectively for the initial calibration and the zero-drift of the measured flow rate. We confirmed that the developed flow meter using a curved cannula with zero compensation was able to accurately measure the flow rate continuously and noninvasively.

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Section: Evaluation Test Using a Mock Circulation Loopmentioning

confidence: 99%