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J Artif Organs. 2015 Dec;18(4):377-81. doi: 10.1007/s10047-015-0860-y. Epub 2015 Aug 8.

Cardiac supporting device using artificial rubber muscle: preliminary study to active dynamic cardiomyoplasty.

Author information

1
Department of Thoracic and Cardiovascular Surgery, Hirosaki University School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori, 036-8562, Japan. yomusai12@yahoo.co.jp.
2
Department of Thoracic and Cardiovascular Surgery, Hirosaki University School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori, 036-8562, Japan.
3
Department of Clinical Engineering, Hirosaki University School of Medicine and Hospital, Aomori, Japan.

Abstract

Dynamic cardiomyoplasty is a surgical treatment that utilizes the patient's skeletal muscle to support circulation. To overcome the limitations of autologous skeletal muscles in dynamic cardiomyoplasty, we studied the use of a wrapped-type cardiac supporting device using pneumatic muscles. Four straight rubber muscles (Fluidic Muscle, FESTO, Esslingen, Germany) were used and connected to pressure sensors, solenoid valves, a controller and an air compressor. The driving force was compressed air. A proportional-integral-derivative system was employed to control the device movement. An overflow-type mock circulation system was used to analyze the power and the controllability of this new device. The device worked powerfully with pumped flow against afterload of 88 mmHg, and the beating rate and contraction/dilatation time were properly controlled using simple software. Maximum pressure inside the ventricle and maximum output were 187 mmHg and 546.5 ml/min, respectively, in the setting of 50 beats per minute, a contraction/dilatation ratio of 1:2, a preload of 18 mmHg, and an afterload of 88 mmHg. By changing proportional gain, contraction speed could be modulated. This study showed the efficacy and feasibility of a pneumatic muscle for use in a cardiac supporting device.

KEYWORDS:

Artificial muscle; Blood vessel prosthesis; Cardiac supporting

PMID:
26253252
DOI:
10.1007/s10047-015-0860-y
[Indexed for MEDLINE]

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