Abstract
One of the major problems of blood pumps used as LVAD/BVAD are thromboembolic complications due to the conduits. To meet these difficulties, several forms of intraventricular implantable assist devices were developed during the last years. We too are engaged to solve this problem and built, 2 years ago, our first device, based on the conception of our Mini-Spindle-Pump under the following premises: In a mock circuit, the pump should move 4-5 L of water/min at a speed of 9-10.000 rpm against a pressure difference of 80 mm Hg between in- and outflow tract. Furthermore, it was supposed to be introduced over the apex cordis into the left ventricle bringing the outflow tract into the ascending aorta. Description of the 1st prototype: Plexiglas housing with 2 chambers: A blood chamber (lenght 137 mm, innerφ 24 mm) and - extraventricular -a chamber (lenght 32 mm, innerφ 30 mm) for sealing (teflon cape) resp. ball bearings (SS 628/4 ZZ and SS MR 106 ZZ), Spindle rotor with 5 windings (lenght 65 mm, outerφ 18 mm, innerφ 6 mm; clearance between housing and spindle 1 mm), small electric motor (Minimotor SA-3556) as a driving unit. In a mock circuit, this prototype transported 4 L of water/min at a speed of 12.000 rpm (afterload 60 mm Hg) and 7 L at 15.000 rpm (afterload 80 mm Hg). These results did not satisfy us regarding the efficiency of the device and evenmore its size. So this prototype was completely redesigned regarding the measurements of the 2nd protoype: Blood chamber (lenght 103 mm. innerφ 20 mm), partial extraventricular positioned 2nd chamber (lenght 72 mm. innerφ 30 mm) for sealing (teflon cape) resp. ball bearings (SS 628/ZZ and SS MR 106 ZZ). Spindle rotor and driving unit stayed unchanged. In a mock circuit, the device moved 4 L of water/min at a speed of 12.000 rpm (afterload 58 mm Hg) and 7 L at 15.000 rpm (afterload 80 mm Hg). Unfortunately, the prototype has the same efficiency as the 1st one: so we will have to work on still a new pump-conception.
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