Research of Totally Implantable Linear Pulse Motor-Driven Artificial Heart

点击翻译按钮获取中文摘要

Totally lmplantable Linear-type Artificial Heart under Animal TestingOur group has been considering the possibility of using a linear pulse motor (LPM) as a driving source, and has developed a series of artificial heart models with the motorThe newly developed implantable linear-type artificial heart (LAH) has two blood pumps, which are inflated and deflated by the LPM alternately, causing a pusher plates to pulsate the bloodThe LAH measures 85 mm in diameter * 95mm wide (0.55 litters total volume) , and weighs 1.2kg. The LPM comprises a flat mover as the secondary member and two stators as the primary member. Two linear bearings are used to support them. Both stators and mover are made of laminated thin layrs of Permendur with high saturation flux density.The LPM provides a kinetic thrust of 50-60 newtons at 60-100 beats per min., the speed required by an artificial heartA Windkessel-type mock circulatory system was used to evaluate the performance of the LAH.The results were good enough to meet the flow rate requirements of a human at rest. Maximum aortic pressure (AoP max) of 141 mmHg, maximum pulmonary arterial pressure (PAP max) of 28 mmHg, and maximum flow rate of 5.1 liters per min. were obtainedIn collaboration with Hiroshima University Medical School, animal testing using a sheep was conducted on September 24 1993. The experiment confimed that the implanted artificial heart could function as expected in a living body. The heart worked properly for up to two hoursThe development profect still faces a number of unsolved problems before device can be applied clinically, but it has been steadily advancing toward the final target