Linear blood pump – first results in mock circulation

M. Grossmann; J. Landrath; I. Merkel; R. Holland; W. Juettner; J. Schmitto; F. A. Schöndube

doi:10.1055/s-2008-1037748

The Thoracic and Cardiovascular Surgeon, Table of Contents

Linear blood pump – first results in mock circulation

M Grossmann ¹, J Landrath ², I Merkel ¹, R Holland ¹, W Juettner ³, J Schmitto ¹, FA Schöndube ¹

¹Georg-August University, Thoracic Cardiovasc Surgery, Goettingen, Germany
²University of applied sciences, Electrical Drive Engineering, Hannover, Germany
³University of applied sciences, Industrial Computer Science, Wolfsburg, Germany

Abstract

As presented in 2006 we propose a new concept for blood propagation – Linear Blood Pump – that is not in need of membranes for displacement or rotating parts. Blood pressure and flow is generated by moving an inlet valve against an outlet valve within a tube driven by a linear motor (see Fig. 1).

Fig. 1

After driving unit modification, prototype is been tested in mock circulation. All blood contact surfaces are made of PEEK with a smooth surface. The whole Prototype is 21cm long including the in- and outlet part with a maximum diameter of 4.8cm outside. Stroke volume can be adjusted between 5 to 85ml. Regulation can either maintain a pressure-gradient independingly of flow- and stroke- rates or regulates pressure-gradient to maintain constant flow-rates. We measured typical data like stroke rate, stroke volume, energy loss, temperature, systole/diastole ratio, velocity of pressure rise and decrease, stroke volume, maximum and minimum pressure augmentation with different pre- and afterloads to characterise pumping mechanism due to regulation-settings.