Large-flow two-stage catheter pump for left ventricle assistance and use method of large-flow two-stage catheter pump

Abstract

The invention provides a large-flow two-stage catheter pump for left ventricle assistance and a using method of the large-flow two-stage catheter pump. The large-flow two-stage catheter pump comprises a pump shell, an impeller, a guide vane, a radial fluid director and a motor. One end of the pump shell is a blood pump inlet, is implanted from femoral artery or axillary artery in a minimally invasive mode and is inserted into a left ventricle through an aortic valve, a blood pump outlet is formed in the side face of the pump shell and is communicated with an aorta, a motor is installed in the other end of the pump shell, and a rotor of the motor is connected with a transmission shaft. Two stages of impellers, two stages of guide vanes and a radial fluid director are arranged between an inlet and an outlet of the blood pump; the transmission shaft penetrates through the impeller, the guide vane and a central hole of one radial fluid director, is in transmission connection with the impeller, and is in non-transmission connection with the guide vane and the radial fluid director; power generated by the motor drives the impeller to rotate so that blood can be conveyed to the aorta from the left ventricle, and the left ventricle assisting effect is achieved. The two-stage impeller mode is adopted, so that the working condition requirement of blood pump assistance is met, and the survival rate of assistance is increased.

Description

Technical field [0001] The present invention relates to the field of medical devices or a cardiac ancillary, and Background technique [0002] The heart auxiliary device refers to a artificial organ that is partially or completely replaced by natural heart function, maintaining the normal blood circulation of the human body. In fact, it is a mechanical device that delivers blood flow, which can be understood as a mechanical pump, also known as a blood pump. Part of the natural heart function is called a ventricular assist device (VENTRICULAR ASSIST DEVICE, VAD), mainly used for acute myocarditis, myocardial infarction, cardiac temporary function loss, etc. Total Artificial Heart, TAH, can be used as a transition method for the end of the final heart failure, more importantly, is used for the patient without any perseverance, or a taboo of heart transplantation, instead of natural heart, for a long time Aid. In terms of technical level, there are two types of artificial heart rese...

AI Technical Summary

Problems solved by technology

However, the current minimally invasive blood pump is limited by the size of the minimally invasive implant, and the impeller diameter of the axial flow blood pump is very small. In order to meet the basic auxiliary requirements, the speed of the blood pump must be increased.

For example, the left heart assist catheter pump (Impella) currently used in clinical applications in the world, due to the limitation of diameter, the speed reaches more than 20000rpm, and the flow rate is only about 2L / min, so the efficiency of rescuing patients is low

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