EVAHEART™: An Implantable Centrifugal Blood Pump for Long-Term Circulatory Support

Kenji Yamazaki, Shinichiro Kihara, Takehide Akimoto, Osamu Tagusari, Akihiko Kawai, Mitsuo Umezu, Jun Tomioka, Robert L. Kormos, Bartley P. Griffith, Hiromi Kurosawa

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Objective: We developed "EVAHEART™": a compact centrifugal blood pump system as an implantable left ventricular assist device for long-term circulatory support. The 55 × 64 mm pump is made from pure titanium, and weighs 370 g. The entire blood-contacting surface is covered with an anti-thrombogenic coating of diamond like carbon (DLC) or 2-methacryloyloxyethyl phosphorylcholine (MPC) to improve blood compatibility. Flows exceeding 12 L/min against 100 mmHg pressure at 2600 rpm was measured. A low-temperature mechanical seal with recirculating cooling system is used to seal the shaft. EVAHEART™ demonstrated an acceptably low hemolysis rate with normalized index of hemolysis of 0.005 ± 0.002 g/100L. Methods: We evaluated the pump in long-term in-vivo experiments with seven calves. Via left thoracotomy, we conducted left ventricular apex-descending aorta bypass, placing the pump in the left thoracic cavity. Results: Pump flow rates was maintained at 5-9 L/min, pump power consumption remained stable at 9-10 W in all cases, plasma free Hb levels were less than 15 mg/dl, and the seal system showed good seal capability throughout the experiments. The calves were sacrificed on schedule on postoperative day 200, 222, 142, 90, 151, 155, and 133. No thrombi formed on the blood contacting surface with either the DLC or MPC coating, and no major organ thromboembolisms occurred except for a few small renal infarcts. Conclusion: EVAHEART™ centrifugal blood pump demonstrated excellent performance in long-term in-vivo experiments.

Original languageEnglish
Pages (from-to)461-465
Number of pages5
JournalJapanese Journal of Thoracic and Cardiovascular Surgery
Volume50
Issue number11
DOIs
Publication statusPublished - 2002 Nov

Keywords

  • Artificial heart
  • Centrifugal blood pump
  • EVAHEART
  • Left ventricular assist device

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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    Yamazaki, K., Kihara, S., Akimoto, T., Tagusari, O., Kawai, A., Umezu, M., Tomioka, J., Kormos, R. L., Griffith, B. P., & Kurosawa, H. (2002). EVAHEART™: An Implantable Centrifugal Blood Pump for Long-Term Circulatory Support. Japanese Journal of Thoracic and Cardiovascular Surgery, 50(11), 461-465. https://doi.org/10.1007/BF02919636