InVAD

Heart faılure
management


InVAD ia a continuos-flow, centrifugal type rotary blood pump that is placed outside the body. The continuous flow design means that the patient may not have a pulse. Can be used as a solution for acute heart failure while longer time options are considered.


InVAD ventricular assist system is a magnetically levitated centrifugal-flow pump that can be applied rapidly in the operating room. By providing flows of up to 5 L/min, this pump can safely support a patient's circulation for 2 weeks or longer.The system comprised of console, a pump motor driver, a flow probe and a flat screen control monitor. Providing a contact-free, friction-free environment, technology can result in 10% low haemolysis, 5% low device-related thrombosis and, improved end-organ function.  This technique may facilitate ambulation and recovery in selected patients.InVAD left ventricular assist device system can be used for perioperative or postcardiotomy circulatory support of the failing heart. The device resides at the patient's bedside, and the cannulae are usually inserted through a midline sternotomy, with the inflow cannula in the left ventricle or right superior pulmonary vein and the outflow cannula in the aorta.

InVAD ia a continuos-flow, centrifugal type rotary blood pump that is placed outside the body. The continuous flow design means that the patient may not have a pulse. Can be used as a solution for acute heart failure while longer time options are considered.
•     5L / min flow rate with maximum 5500 rpm

•     8x8 Magnetically bearing turbine

•     Middle chamber for laminar flow

•     Internal volume 19.82 ml

•     Design for Short Term

•     BLDC motor direct torque copling design (1:1 torque transfer)

•     Contact surface is kept minimal  to reduce tear stress

•     Moving Contact Area: 870 mm ^ 2

•     System inlet pressure: 40 mm-Hg

•     System Outlet Pressure: 1000 mm-Hg (2)

•     The finite element analysis was performed  according to the constant input pressure of 5500 rpm.
 

Pump Drive Motor Power Equation

    V = 12 volts

•     I = 1.2 A

•     Pm = 14.4 watts (maximum Pm value)

•     DC motor efficiency = 80%

•     Pm = 14.4 * 0.80 = 11.5 watts

Dead space is designed at the impeller inlet (rotation axis) in order to prevent the laminar flow. In this way, hydrodynamic levitation of impes (effect of buoyancy) is provided.