Blood sealing characteristics of mechanical seal for rotary pump type artificial heart.

Bearing Dynamic Characteristics of the Ventrassist Rotary Blood Pump

The VentrAssist implantable rotary blood pump, intended for long term ventricular assist, is under development and is currently being tested for its rotor-dynamic stability. A shaftless impeller, which also acts as the rotor of the brushless DC motor, is passively suspended in the pump cavity by hydrodynamic forces. The paper presents experimental investigation of the displacement of the impell...

Sealing of Rotary Drums for Operation Under Pressurized Conditions

A Sensorless Robust Tracking Control of an Implantable Rotary Blood Pump for Heart Failure Patients

Physiological control of a left ventricle assist device (LVAD) is generally a complicated task due to diverse operating environments and patient variability. In this work, a tracking control algorithm based on sliding mode and feed forward control for a class of discrete-time single input single output (SISO) nonlinear uncertain systems is presented. The controller was developed to track the re...

Magnetic drive system for a new centrifugal rotary blood pump.

The purpose of this investigation was to design a novel magnetic drive and bearing system for a new centrifugal rotary blood pump (CRBP). The drive system consists of two components: (i) permanent magnets within the impeller of the CRBP; and (ii) the driving electromagnets. Orientation of the magnets varies from axial through to 60 degrees included out-lean (conical configuration). Permanent ma...

Influence of Surface Texture on Friction Properties of Mechanical Seals for Blood -Design Concept of Sealing Surface of Mechanical Seal for Ventricular Assist Device-

Low, stable friction, a higher load-carrying capacity, and lower leakage of sealed blood are required for mechanical seals in implantable ventricular assist devices. One solution is to apply surface texture to the mechanical seal surface, consisting of self-mated silicon carbide. However, the effect of surface texture on the frictional properties of mechanical seals under blood sealing conditio...