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Magnetic levitation centrifugal blood pump integrated with extracorporeal circulation magnetic wheel

An extracorporeal circulation and magnetic levitation technology, which is applied in blood circulation treatment, drug devices, and other medical devices, etc., can solve problems such as renal function impairment, platelet aggregation, vascular dysfunction, etc., to reduce the slit area and improve flushing. effect, the effect of reducing the occurrence of thrombosis

Active Publication Date: 2022-07-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third-generation artificial heart pump uses magnetic levitation, hydraulic levitation or magnetic-liquid coupling levitation to support the rotation of the impeller, which reduces the probability of hemolysis and thrombus, reduces friction loss, and prolongs the use time. However, hemolysis is compatible with blood such as thrombus. sexual problems persist
In addition, the blades of most maglev centrifugal blood pumps are fixed on the base containing permanent magnets. In order to facilitate the control of the rotation posture of the impeller, the size of the permanent magnets inside the base is often large, so there is a large gap between the outer wall of the base and the pump casing , while the high shear stress inside the slit can cause severe blood damage
Most of the mainstream third-generation artificial hearts in the world use constant-speed drive, but the natural heart is a pulsating pulsating flow. When the constant-speed rotary vane pump is implanted in the human body, there will inevitably be matching problems. In addition, the form of the flow field in the vane pump is fixed, and it is easy to form some areas with poor blood flow, which will lead to platelet aggregation and cause thrombosis, which seriously endangers the life of the patient.

Method used

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  • Magnetic levitation centrifugal blood pump integrated with extracorporeal circulation magnetic wheel
  • Magnetic levitation centrifugal blood pump integrated with extracorporeal circulation magnetic wheel
  • Magnetic levitation centrifugal blood pump integrated with extracorporeal circulation magnetic wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Stable cycle condition

[0037] In stable circulation conditions, blood passes through figure 1 The circulatory system shown flows into the straight inlet pipe 3 of the device of the present invention, forms a continuous flow in the blood pump and flows out through the straight outlet pipe 8 and returns to the circulatory system.

[0038] There are two main paths for blood flow in the pump: one is that the blood flows from the suction chamber 2 into the axial flow into the central flushing hole 12, and then turns radially into the closed impeller 11, and the rotation of the closed impeller 11 is affected by the electromagnetic outside the pump. System control, the rotational speed changes periodically, the closed impeller 11 does work on the blood to make it increase and pressurize, the blood flows out of the closed impeller 11 and then impacts the annular volute 6 and decelerates and pressurizes, and the blood rotates circumferentially in the volute chamber ...

Embodiment 2

[0040] Example 2: Weaning state

[0041] In the weaning state, the magnetic suspension centrifugal blood pump integrated with the extracorporeal circulation magnetic wheel of the present invention maintains the simulation process in the first embodiment, and gradually reduces the rotation speed of the closed impeller 11 by monitoring the body circulation signs, and gradually reduces the blood flow , until the blood flow is zero; after the body fully recovers the spontaneous circulation, the blood pump is removed to complete the weaning.

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PUM

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Abstract

The invention discloses a magnetic suspension centrifugal blood pump integrated with an extracorporeal circulation magnetic wheel, comprising: an equal straight inlet pipe, an annular volute, an equal straight outlet pipe, a closed impeller and a permanent magnet assembly; , The lower cover annular permanent magnet and the large blade permanent magnet group are built in the upper cover, lower cover and three large blades of the closed impeller, which minimizes the slit area and reduces hemolysis; The electromagnetic system realizes the periodic change of the closed impeller speed and simulates the diastolic and systolic states of the heart; the reference speed and the speed change range are controlled according to the needs of the patient to ensure sufficient blood pressure and flush the potential area of ​​thrombus formation. The invention can effectively simulate the frequency and strength of the heart beat, which is beneficial to the adjustment of the weaning process; it can effectively avoid the damage of blood cells caused by the leakage vortex of the blade tip gap, and inhibit the occurrence of thrombus.

Description

technical field [0001] The invention relates to the technical field of extracorporeal circulation artificial heart pumps, in particular to a magnetic suspension centrifugal blood pump integrated with extracorporeal circulation magnetic wheels. Background technique [0002] An artificial heart pump is a device that provides blood circulation support through mechanical circulation. Extracorporeal membrane oxygenation technology is mainly used to provide extracorporeal respiration and circulation for patients with severe cardiopulmonary failure or waiting for organ transplantation. The core parts are the membrane lung and blood pump. During the new crown epidemic, extracorporeal membrane oxygenation technology has successfully treated many patients with severe new coronavirus pneumonia, and the effect is remarkable. [0003] The development of artificial heart pump has gone through three stages: the first generation of bionic pulsating artificial heart; the second generation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M1/16A61M1/36
CPCA61M1/3666A61M1/1621A61M1/1698A61M1/3621A61M2202/0413A61M2202/0021
Inventor 柳阳威谢楠唐雨萌
Owner BEIHANG UNIV