Implanted miniature streamlined shaft bloodshed pump

Abstract

The invention relates to an embedded micro streamline axial flow blood pump, which can be used for assisting blood circulation of failed heart. The blood pump comprises a pump body arranged in a sleeve body and a driving device arranged outside the pump body, wherein the pump body comprises the sleeve body, a front guide vane, a rotor and a back guide vane; the hubs of the front guide vane, a rotor and the back guide vane are designed integrally in an integral streamline form; and the front half part of the rotor is provided with an inductive blade. The blood pump can reduce the on-way pressure loss of the blood in the flow channel of the blood pump, improve efficiency and reduce hemolysis; and can promote the circumferential speed of the blood after entering into a rotor area due to the inductive blade arranged on the front half part of the rotor, and avoids the occurrence of vacuole phenomenon.

Description

technical field [0001] The invention relates to an implanted streamlined miniature axial flow blood pump, which can be used to assist the blood circulation of a failing heart, and belongs to the technical field of biomedical engineering. Background technique [0002] Statistics from the World Health Organization show that cardiovascular disease has always been the number one killer threatening human health, accounting for about 30% of the total global deaths. The effective way to treat end-stage heart failure is heart transplantation or implanted auxiliary artificial heart. Although heart transplantation has achieved great success, the problem of heart donors is difficult to solve. It is extremely important and urgent to develop long-term implantable micro blood pumps. At present, the blood pumps in clinical application are mainly axial flow pumps. The flow performance of axial flow pumps is better than that of centrifugal pumps, and can provide greater blood flow. The flow...

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Problems solved by technology

In addition, in the flow field of the axial flow blood pump, cavitation is difficult to avoid, which will cause huge damage to the blade surface. In the flow field of the artificial blood pump, when the blood flows from the leading vane to the rotor area, The blood only has an axial velocity in the leading vane. Once it flows into the rotor area, its circumferential velocity is very high, which is dozens of times its axial velocity. According to Bernoulli's principle, the pressure here becomes very low, lower than The saturated vapor pressure of the blood will generate air bubbles. When the air bubbles move downstream and reach the area with higher pressure, the air bubbles will suddenly collapse. This process will generate extremely high pressure, which will cause the destruction of blood cells and cause damage to the blades of the blood pump. destroy

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