Preliminary Validation of a New Magnetic Wireless Blood Pump

Abstract

In general, a blood pump must be small, have a simple configuration, and have sufficient hydrodynamic performance. Herein, we introduce new mechanisms for a wireless blood pump that is small and simple and provides wireless and battery-free operation. To achieve wireless and battery-free operation, we implement magnetic torque and force control methods that use two external drivers: an external coil and a permanent magnet with a DC-motor, respectively. Power harvesting can be used to drive an electronic circuit for wireless monitoring (the observation of the pump conditions and temperature) without the use of an internal battery. The power harvesting will be used as a power source to drive other electronic devices, such as various biosensors with their driving circuits. To have both a compact size and sufficient pumping capability, the fully magnetic impeller has five stages and each stage includes four backward-curved blades. The pump has total and inner volumes of 20 and 9.8 cc, respectively, and weighs 52 g. The pump produces a flow rate of approximately 8 L/min at 80 mm Hg and the power generator produces 0.3 W of electrical power at 120 Ω. The pump also produces a minimum flow rate of 1.5 L/min and a pressure of 30 mm Hg for circulation at a maximum distance of 7.5 cm.

Design of a hybrid left ventricular assist device with a new wireless charging system

“…However, implanting two separate pumps in the body occupied more space than a single pump. Moreover, the distance limitation between the extracorporeal magnets and intrathoracic pump remained a fundamental problem of the magnetic pump 7,8 . To solve these problems, we developed a single hybrid pump driven by either magnetic or electric force and charged wirelessly without an external coil.…”

A Novel Double-Stator Tubular Vernier Permanent-Magnet Motor With High Thrust Density and Low Cogging Force

“…Compared to the conventional air-driven artificial hearts, the motor-driven artificial heart has several advantages, such as the use of small-gage wires instead of large percutaneous drive tubes, and the possibility of more accurate control and quiet operation. As an indispensable component of the artificial heart system, the electric blood pump must be suitable for the human physiological characteristics [2]- [4]. Conventional electric blood pumps employ the rotary motor and a conversion gear mechanism, but they suffer from mechanical wear and blood damage [5].…”

Design of an Innovative Wireless Left Ventricular Assist Device Driven by either Extracorporeal Magnets or an Intracorporeal Battery Pack

“…Another concept of wireless LVADs uses magnetic force to rotate an impeller inside the body. 2,3 Nevertheless, this type of LVAD is easily stopped by a loss of synchronism between the impeller’s magnets and extracorporeal magnets and is therefore unstable to drive for long periods of time. Moreover, a patient must keep a device to generate a magnetic field at all times.…”