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

Détails

ID Serval
serval:BIB_738E682242D5
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
No drive line, no seal, no bearing and no wear: magnetics for impeller suspension and flow assessment in a new VAD.
Périodique
Interactive Cardiovascular and Thoracic Surgery
Auteur(s)
Huber C.H., Tozzi P., Hurni M., von Segesser L.K.
ISSN
1569-9285[electronic]
Statut éditorial
Publié
Date de publication
06/2004
Volume
3
Numéro
2
Pages
336-340
Langue
anglais
Notes
Journal Article --- Old month value: Jun
Résumé
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+/-1395.4 rev./min (min 5000/max 8500 rev./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 (y=1.0339x, R2=0.9357). 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.
Pubmed
Création de la notice
29/01/2008 15:45
Dernière modification de la notice
03/03/2018 18:19
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