Single-axis variable-speed two-stage asynchronous heart pump with differential term iterative curve flow channel and its application method

Abstract

The invention relates to a single-axis variable-speed two-stage asynchronous heart pump with a difference term iterative curve flow path and a method for using it. The single-axis variable-speed two-stage asynchronous heart pump includes a pump casing flow path with a pump inlet and a pump outlet. The pump casing flows There is a fixed guide vane body in the channel, and the first-stage impeller and the second-stage impeller are fixed on the drive shaft through keys; a DC permanent magnet motor is also fixed on the inner side of the hub of the fixed guide vane body through a shock-absorbing support, and the frequency sensor The shell of the fixed guide vane hub is inlaid as a whole, and the fixed guide vane body is provided with a plurality of guide vane blades uniformly distributed around the x-axis, and the fixed guide vane body is fixed on the pump casing through the guide vane blades. On the inner wall of the shell cavity of the channel, the shape line of the inner wall of the shell cavity is a difference iterative curve. The invention has the advantages of compact structure, large flow rate, high head, less damage to blood cells, and reduces the probability of hemolysis caused by the heart pump. The pump speed can be changed in real time through the frequency sensor to meet the real-time demands of human blood pressure and blood flow.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and axial-flow heart pumps, and in particular relates to a single-axis variable-speed two-stage asynchronous heart pump with a differential term iterative curve flow channel and a use method thereof. Background technique [0002] The existing known vane-type single-stage heart pumps mainly have two structural forms: axial flow and centrifugal. For the vane-type single-stage heart pump, the demand for blood pressure of the human body is all met by the lift provided by the single-stage impeller, but this will lead to single-stage The pressure difference between the working surface and the back of the impeller blade is too large, which will cause damage to the blood cells and cause hemolysis, which will become more serious with the increase of the head. [0003] The current research on the flow channel form of the vane single-stage heart pump is relatively simple. ZL201911056672.3 discloses a...

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Problems solved by technology

[0002] The existing known vane-type single-stage heart pumps mainly have two structural forms: axial flow and centrifugal. For the vane-type single-stage heart pump, the demand for blood pressure of the human body is all met by the lift provided by the single-stage impeller, but this will lead to single-stage The pressure difference between the working surface and the back of the impeller blade is too large, which will cause damage to blood cells and cause hemolysis. This phenomenon will become more serious with the increase of the lift.

[0003] The current research on the flow channel form of the vane single-stage heart pump is relatively simple. ZL201911056672.3 discloses a centrifugal heart pump with a low hemolysis rate. Although this type of centrifugal heart pump makes the flow in the pump body more uniform, the centrifugal heart pump The structure of the pump determines that no matter how it is improved, the blood must go through the "circular" flow in the volute before entering the outlet channel. The complex internal flow can easily cause damage to blood cells, resulting in hemolysis

ZL201910222234.3 discloses an implantable shaftless heart pump with a gradually changing flow path. A simple superposition does not take into account the actual use needs of different patients

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