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Christoph H. Huber
Piergiorgio Tozzi
Michel Hurni
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Interactive Cardiovascular and Thoracic Surgery 3:336-340(2004)
© 2004 European Association of Cardio-Thoracic Surgery

Work in progress report - Assisted circulation

No drive line, no seal, no bearing and no wear: magnetics for impeller suspension and flow assessment in a new VAD

Christoph H. Huber*, Piergiorgio Tozzi, Michel Hurni and Ludwig K. von Segesser

Service de Chirurgie Cardiovasculaire, Centre Hospitalier Universitaire Vaudois CHUV, 1011 Lausanne, Switzerland

* Corresponding author. Tel.: +41-21-314-22-80; fax: +41-21-314-22-78
huberch{at}dr.com

The new magnetically suspended axial pump is free of seals, bearings, mechanical friction and wear. In the absence of a drive shaft or flow meter, pump flow assessment is made with an algorithm based on currents required for impeller rotation and stabilization. The aim of this study is to validate pump performance, algorithm-based flow and effective flow. A series of bovine experiments was realized after equipment with pressure transducers, continuous-cardiac-output-catheter, intracardiac ultrasound (AcuNav) over 6 h. Pump implantation was through a median sternotomy (LV->VAD->calibrated transonic-flow-probe->aorta). A transonic-HT311-flow-probe was fixed onto the outflow cannula for flow comparison. Animals were electively sacrificed and at necropsy systematic pump inspection and renal embolus score was realized. Observation period was 340±62.4 min. The axial pump generated a mean arterial pressure of 58.8±14.3 mmHg (max 117 mmHg) running at a speed of 6591.3±1395.4rev./min (min 5000/max 8500rev./min) and generating 2.5±1.0 l/min (min 1.4/max 6.0 l/min) of flow. Correlation between the results of the pump flow algorithm and measured pump flow was linear ( ). VAD explants were free of macroscopic thrombi. Renal embolus score was 0±0. The magnetically suspended axial flow pump provides excellent left ventricular support. The pump flow algorithm used is accurate and reliable. Therefore, there is no need for direct flow measurement.

Key Words: Ventricular assist device; Axial blood pump; Heart failure

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