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A Blood Pump Used for Displacement Measurement of Magnetic Fluid Coupled Suspended Impeller

A displacement measurement and suspension technology, applied in blood pumps, measuring devices, optical devices, etc., can solve problems such as inability to directly measure the displacement of the impeller

Inactive Publication Date: 2019-02-01
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blood pump housing is made of metal, and the fluid in the pump is opaque blood, so it is impossible to directly measure the displacement of the impeller.

Method used

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  • A Blood Pump Used for Displacement Measurement of Magnetic Fluid Coupled Suspended Impeller
  • A Blood Pump Used for Displacement Measurement of Magnetic Fluid Coupled Suspended Impeller
  • A Blood Pump Used for Displacement Measurement of Magnetic Fluid Coupled Suspended Impeller

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Experimental program
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specific Embodiment approach 1

[0022] combine figure 1 and figure 2 To illustrate this embodiment, a blood pump designed by the present invention for measuring the displacement of the magnetic-fluid coupling suspension type impeller, its structure includes an upper pump casing (1), a lower pump casing (8), an impeller (4), a motor Shell (6), DC brushless motor (7), detection window (9), detection window (10) and detection window (12). When carrying out the displacement measurement experiment of the impeller of the blood pump, the blood was replaced with the glycerol aqueous solution (5) of the same viscosity. Three detection windows (9) are made on the upper surface of the blood pump, and the transparent plexiglass (3) is firmly stuck in the stepped hole with glue (2), and the detection beam emitted by the displacement sensor probe passes through the transparent plexiglass ( 3) and glycerin aqueous solution (5) irradiate the upper surface of the impeller, which is a plane with good reflection characteris...

specific Embodiment approach 2

[0023] combine image 3 To illustrate this embodiment, when measuring the axial displacement of the blood pump impeller, before starting the blood pump, adjust the probe of the displacement sensor so that the upper surface of the impeller is within the measurement range of the probe. At this time, the axial clearance at the bottom of the blood pump impeller (4) is is 0, the axial gap at the top of the impeller (4) is the largest, which is the sum of the axial gaps of the blood pump . After the blood pump is started, the lower end surface of the impeller (11) makes the impeller (4) in a suspended running state under the action of the magnetic levitation force and the supporting force of the aqueous glycerin solution, and the displacement sensor will measure the axial displacement of the impeller, and at the same time the axial displacement of the impeller The value is also the bottom clearance value of the impeller , the sum of axial clearances of the blood pump minus imp...

specific Embodiment approach 3

[0024] combine Figure 4 and Figure 5 To illustrate this embodiment, the unstable operation of the impeller (4) will cause deflection in the radial direction. In order to measure the radial deflection of the impeller and the resulting diameter between the main shaft (13) of the blood pump and the inner wall (15) To change the gap, use two displacement sensors to measure the radial offset value of the outer wall of the impeller (14) at the two points A and B corresponding to the two detection windows (12) at 90° to each other, and calculate the The eccentricity of the impeller (4) from the ideal center of rotation , That is, the deflection of the impeller in the radial direction, the minimum radial clearance between the main shaft of the blood pump and the impeller with the maximum They are: , ,in and Respectively impeller inner wall (15) radius and main shaft (13) radius. Therefore, the radial clearance value of the blood pump is in ( , ) between changes...

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Abstract

Unstable deflection of a magnetic fluid coupling suspended impeller of a blood pump may cause turbulence of a flow field, resulting in damage to blood and inducing hemolysis and thrombus. Therefore, the influence of deflection of the impeller on the flow field is analyzed by measuring axial and radial displacements of the impeller of the blood pump. However, since a pump case material of the blood pump and blood are both opaque mediums, the displacements of the impeller under operating condition cannot be measured. The invention provides a blood pump for displacement measurement of a magnetic fluid coupling suspended impeller, which can achieve measurement of axial and radial displacements of the impeller. The blood pump disclosed by the invention comprises an upper pump case, an impeller, a lower pump case, a motor case, a DC brushless motor, and detection windows. During impeller displacement measurement, the blood in the blood pump is replaced by a glycerine solution having the same viscosity as the blood. A displacement sensor can achieve micron-scale high-accuracy non-contact real-time measurement of displacements of the impeller by means of the detection windows in different positions of the pump case and the transparent glycerine solution.

Description

technical field [0001] The invention belongs to the technical field of artificial heart, and in particular relates to a blood pump used for displacement measurement of a magnetic-fluid coupling suspension type impeller. Background technique [0002] In order to solve the damage caused by the mechanical bearing-supported impeller in the second-generation blood pump, the third-generation blood pump adopts a suspended impeller without mechanical bearing support, which eliminates hemolysis and thrombus caused by mechanical bearing wear and heat. However, the motion state of the suspended impeller is not easy to control, and at the same time, changes in the pressure and flow of the blood pump can easily cause a complex flow field, making the impeller in an unstable state of operation. The unstable running state of the impeller will cause flow field disorder, especially the high shear force will be generated in the narrow gap between the impeller and the pump casing, and the high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M1/10G01B11/02
CPCA61M60/205G01B11/02
Inventor 王义文沈朋方媛付鹏强周亮
Owner HARBIN UNIV OF SCI & TECH