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

A curved flow and heart pump technology, applied in blood pumps, circulatory assistance devices, suction devices, etc., can solve the problems of large pressure difference between the working surface and the back of the single-stage impeller blade, failure to consider the needs of different patients, blood cell destruction, etc. , to achieve the effect of favorable overall structure, convenient design, and reduced chance of hemolysis

Active Publication Date: 2021-05-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1. The present invention proposes a uniaxial variable-speed two-stage asynchronous heart pump with a differential term iterative curve flow path, which includes a pump casing flow path 39 with a pump inlet 6 and a pump outlet 2, and a fixed guide is arranged in the pump casing flow path 39. The blade body 3, the first-stage impeller 5 and the second-stage impeller 4 are fixed on the transmission shaft 8 through a key; it also includes a DC permanent magnet motor 1 fixed on the inner side of the hub of the fixed guide vane body 3 through a shock absorber 37, The housing of the frequency sensor 38 is inlaid with the fixed guide vane hub tail 9 as a whole, the fixed guide vane body 3 is provided with a plurality of guide vane blades uniformly distributed around the x-axis, and the fixed guide vane body 3 passes through the guide vane The vane is fixed on the inner wall of the casing cavity of the pump casing flow channel 39;

[0017] The profile line of the casing...

Embodiment 2

[0024] Example 2. The present invention proposes a method for using a single-axis variable-speed two-stage asynchronous heart pump with a differential term iterative curved flow channel, which is characterized in that on the basis of the above-mentioned structure of the present invention, the DC permanent magnet motor 1 is connected by the transmission shaft 8 through the key The power is transmitted to the first-stage impeller 5; the transmission shaft 8 transmits the power to the planet carrier 13 through the key, the front planetary transmission gear 14 and the rear planetary transmission gear 15 are connected through the planetary transmission shaft 35, and the rear planetary transmission gear 15 and the hollow gear 17 meshes, the front planetary transmission gear 14 meshes with the ring gear 19, the ring gear 19 transmits the power to the second-stage impeller hub 22 through the fastening bolt 18, the front planetary transmission gear 14, the rear planetary transmission ge...

Embodiment 3

[0027] Example 3. The specific requirements for the component design, assembly and use of a single-axis variable-speed two-stage asynchronous heart pump proposed by the present invention are as follows:

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M60/216A61M60/419
Inventor 戴景郑源阚阚许哲陈会向张付林戴杰
Owner HOHAI UNIV
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