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One‐Month Biocompatibility Evaluation of the Pediatric TinyPump in Goats
Author(s) -
Ando Yusuke,
Kitao Takashi,
Nagaoka Eiki,
Kimura Taro,
Yokoyama Yoshimasa,
Yoshikawa Masaharu,
Tominaga Ryuji,
Takatani Setsuo
Publication year - 2011
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2011.01321.x
Subject(s) - impeller , ventricular assist device , centrifugal pump , extracorporeal , circulatory system , medicine , descending aorta , population , peristaltic pump , extracorporeal circulation , cardiology , in vivo , biomedical engineering , continuous flow , aorta , heart failure , biology , physics , microbiology and biotechnology , environmental health , meteorology , mechanics , thermodynamics
The TinyPump is an extracorporeal, magnetically driven centrifugal blood pump with its impeller suspended magnetically and hydrodynamically to provide short‐term mechanical circulatory support for children and infants. We have previously demonstrated that the in vivo experiments of the experimental TinyPump showed acceptable stable performance at pump flows averaging around 1.0 L/min with low hemolytic and thrombogenic properties for up to 2 weeks. We present here the 1‐month in vivo evaluation of the TinyPump, whose design was modified further for more durable operation. The pump was implanted as a left ventricular assist device in five goats (12.5–26.7 kg), with inflow inserted into the left ventricular apex and outflow anastomosed to the descending aorta. Five animals were supported for 110 pump days, with mean pump flow of 1.19 ± 0.03 L/min at a pump speed of 2679 ± 97 rpm. Two animals reached the scheduled end point of 30 days without device failure, and mean plasma‐free hemoglobin was 1.7 ± 0.8 mg/dL. Hematologic and biochemical data of these two animals showed no evidence of cardiovascular, renal, or hepatic dysfunction. Although further experiments are needed, the modified TinyPump offers promise as a short‐term mechanical circulatory support device in pediatric population.