An artificial heart pump operating state monitoring device

Abstract

The present invention relates to a monitoring device for the operating state of an artificial heart pump, which can solve the monitoring problem that the rotational speed of the artificial heart pump blade does not match the rotational speed of the motor after the blood parameters change. The device mainly includes an artificial heart pump, a magnet holder, a contact-separation triboelectric nanogenerator module, an electromagnetic power generation module, and an independent-layer triboelectric nanogenerator module. At low speeds, the magnet in the pump is excited to rotate by the magnet on the magnet holder, and at the same time, the magnet on the copper electrode of the contact-separation triboelectric nanogenerator module is excited to periodically contact and separate from the insulator material layer, generating an electrical signal. At high speeds, the magnet in the pump cuts the coil to generate an electrical signal, and the frequency of this electrical signal represents the rotational speed of the artificial heart pump blade. The insulator material rotor part of the independent-layer triboelectric nanogenerator rotates with the motor shaft and frictions with the copper electrode on the stator to generate an electrical signal, and the frequency of this electrical signal represents the rotational speed of the motor. By comparing the frequencies of the two, it is possible to detect whether the artificial heart pump has lost its rotational speed and give an early warning in time.

Description

Technical Field

[0001] The present invention relates to the field of biomedical engineering, and in particular to a device for monitoring the operating status of an artificial heart pump. Background Art

[0002] Artificial hearts can completely or partially replace the functions of natural hearts, helping patients with heart failure to achieve transition to transplantation (BTT), transition to recovery (BTR) or permanent replacement therapy (DT). They are necessary means of prolonging life for patients with heart failure who cannot undergo natural heart transplantation, and are used in the clinical treatment of heart failure. The "China Cardiovascular Disease Report 2018" released in 2019 pointed out that there are 4.5 million heart failure patients in my country, and the market demand for artificial hearts is huge. The global artificial heart market potential is estimated to be US$50 billion. However, the application of artificial materials makes it very easy to generate various substances in artificial hearts that delay the internal pump speed of artificial heart pumps, which can easily cause the "loss of rotation" phenomenon between the heart pump speed and the motor speed, thus having unpredictable effects on the life and health of users.

[0003] At present, the research on monitoring the internal operation status of pumps based on the principles of radiation / optics / ultrasound has become a hot topic at home and abroad. However, indirect measurements based on sensors have the disadvantages of expensive sensors and inconvenient use. When the actual speed of the pump is indirectly measured using the motor end speed, inaccurate detection will threaten the life and health of the user when the speed is "lost". Summary of the invention

[0004] The purpose of the present invention is to provide an artificial heart pump operation status monitoring device to solve the above problems existing in the prior art. The present invention provides a device that can monitor the actual rotation speed inside the artificial heart pump with high accuracy and without harm, and can realize real-time operation status monitoring of the artificial heart pump.

[0005] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0006] An artificial heart pump operation status monitoring device comprises an artificial heart pump, a magnet holder, a motor, a pump bracket, a top hanging platform, a contact-separation type friction nanogenerator module, an electromagnetic power generation module, and an independent layer type friction nanogenerator module, wherein the artificial heart pump is clamped with the pump bracket, the pump bracket is screwed with the motor, the motor shaft of the motor is clamped with the magnet holder, and the magnet holder and the impeller of the artificial heart pump are built with mutually inductive magnets;

[0007] The electromagnetic power generation module is composed of a coil, and the electromagnetic power generation module is placed flat on the pump bracket;

[0008] The independent layer type triboelectric nanogenerator module includes a rotor, an insulator material layer, a copper electrode, and a stator. The rotor is clamped to the motor shaft. The insulator material layer is adhered to the rotor. The stator is screwed to the motor bracket. A PCB board is adhered to the stator. The copper electrode is adhered to the PCB board. The insulator material layer is a PTFE film;

[0009] The contact-separation type triboelectric nanogenerator module includes a copper foil, a PTFE board, and a magnet. The magnet is adhered to the copper foil and inductively interacts with the magnet inside the impeller;

[0010] The pump bracket is screwed to the top hanging platform. The top hanging platform is used to install the contact-separation type triboelectric nanogenerator module. The fixing clamp is screwed to the top hanging platform. The contact-separation type triboelectric nanogenerator module is screwed to the fixing clamp;

[0011] The magnet holder is provided with three grooves, and strong magnets are placed in the grooves.

[0012] At low speeds, the magnet in the pump is excited by the magnet on the magnet holder to rotate. At the same time, the magnet on the copper foil of the contact-separation type triboelectric nanogenerator module is excited, causing it to periodically contact and separate from the PTFE board, generating electrical signal one. At high speeds, the magnet in the pump cuts the coil placed flat on the pump bracket to generate electrical signal two. The frequencies of electrical signal one and electrical signal two represent the rotational speed of the blades in the artificial heart pump; the insulator material layer on the rotor of the independent layer type triboelectric nanogenerator module rotates with the motor shaft and rubs against the copper electrode on the stator to generate electrical signal three. The frequency of this electrical signal three represents the rotational speed of the motor. By comparing the two frequencies, the actual operating state inside the artificial heart pump can be obtained.

[0013] The beneficial effects of the present invention are as follows: An artificial heart pump operating state monitoring device is provided. The magnet holder of this device is provided with three grooves, and strong magnets are placed in the grooves. When the motor rotates, the independent layer type triboelectric nanogenerator module generates a voltage signal that is linearly related to the rotational speed of the motor and can represent the rotational speed of the motor. The rotational speed of the magnet holder is the same as that of the motor shaft. The magnet inside the magnet holder drives the impeller in the pump to rotate through magnetic excitation. The magnetic induction lines of the magnet carried by the impeller in the pump cut the coil placed flat on the bracket to generate an electrical signal. The magnet carried by the impeller in the pump excites the magnet on the contact-separation type triboelectric nanogenerator module, causing the triboelectric nanogenerator to continuously contact and separate, generating a voltage signal. When the rotational speed of the motor is low, the voltage signal generated by the electromagnetic power generation module is small and difficult to detect. When the rotational speed of the motor is high, due to mechanical rigidity, the contact-separation type triboelectric nanogenerator module is difficult to effectively respond. By organically combining the electromagnetic power generation module and the contact-separation type triboelectric nanogenerator module, the actual rotational speed inside the pump can be monitored. By comparing their electrical output results with those of the lower independent layer type triboelectric nanogenerator module, the actual operating state inside the artificial heart pump can be obtained, with high accuracy, and it can be widely applied in the field of health care. Brief Description of the Drawings

[0014] Figure 1 is the assembly drawing of the operating state detection device for the artificial heart pump;

[0015] Figure 2 is the exploded view of the operating state detection device for the artificial heart pump;

[0016] Figure 3 is the cross-sectional view of the artificial heart pump and the contact-separation mode triboelectric nanogenerator module;

[0017] Figure 4 is the structural diagram of the contact-separation type triboelectric nanogenerator module;

[0018] In the figure:

[0019] 1. Motor; 2. Stator; 3. PCB board; 4. Copper electrode; 5. Insulator material layer; 6. Rotor; 7. Magnet holder; 8. Magnet in the magnet holder; 9. Nylon fixed foot cup base; 10. Nylon fixed foot cup pillar; 11. M6*30-8 hexagonal copper post; 12. M6*10-8 hexagonal copper post; 13. Nut; 14. Pump bracket; 15. Heart pump; 16. Top hanging platform; 17. Fixed splint; 18. Electromagnetic power generation module; 19. M6*10 screw; 20. Contact-separation type triboelectric nanogenerator module; 21. Magnet in the contact-separation type triboelectric nanogenerator module; 22. M2.5*4 screw; 15-1. Inner magnet of the heart pump; 20-1. Copper foil; 20-2. PTFE board. Detailed Implementation Modes

[0020] The following further describes the detailed content of the present invention and its specific implementation modes in conjunction with the accompanying drawings.

[0021] Refer to Figures 1 to 4, An artificial heart pump operating state monitoring device, comprising a motor, a stator, a PCB board, copper electrodes, an insulator material layer, a rotor, a magnet holder, magnet holder magnets, a nylon fixed foot cup base, nylon fixed foot cup struts, M6*30-8 hexagonal copper posts, M6*10 hexagonal copper posts, nuts, a pump bracket, a heart pump, a top hanging platform, a fixed splint, an electromagnetic power generation module, M6*10 screws, a contact-separation type triboelectric nanogenerator module, M2.5*4 screws. The heart pump is snap-connected to the pump bracket, the pump bracket is screwed to the motor, the motor shaft of the motor is snap-connected to the magnet holder, and the magnet holder and the magnet built into the impeller in the artificial heart pump have mutually inductive magnets; The independent layer type triboelectric nanogenerator module includes a rotor, an insulator material layer, copper electrodes, and a stator. The rotor is snap-connected to the motor shaft, the insulator material layer is adhered to the rotor, the stator is screwed to the motor bracket, the PCB board is adhered to the stator, the copper electrodes are adhered to the PCB board, and the insulator material layer is a PTFE film; The contact-separation type triboelectric nanogenerator module includes a copper foil, a PTFE board, and a magnet. The magnet is adhered to the copper foil and mutually inductive with the magnet built into the impeller; The electromagnetic power generation module is composed of coils and is placed flat on the pump bracket; The pump bracket is screwed to the top hanging platform, the top hanging platform is used to install the contact-separation type triboelectric nanogenerator module, the fixed splint is screwed to the top hanging platform, and the contact-separation type triboelectric nanogenerator module is screwed to the fixed splint; Three grooves are provided in the magnet holder, and strong magnets are placed in the grooves.

[0022] Further, there is an excitation effect between the magnet (8) on the magnet holder (7) and the magnet (15-1) in the heart pump (15), and the magnet (15-1) in the heart pump (15) also has an excitation effect on the magnet (21) adhered to the contact-separation type triboelectric nanogenerator module (20).

[0023] Further, the contact-separation type triboelectric nanogenerator module (20) is connected to the top hanging platform (16) through the fixed splint (17). The magnet (21) is adhered to the copper foil (20-1) and continuously contacts and separates from the PTFE board suspended on the outermost layer by the action of attracting opposite sexes with the magnet (15-1) in the pump.

[0024] See Figures 1 to 4 , as shown, the working process of the present invention is as follows:

[0025] When the artificial heart pump is working properly, the output electrical signal frequency of the independent layer triboelectric nanogenerator module clamped on the motor shaft is consistent with the motor speed. The magnet in the magnet holder clamped on the motor shaft drives the rotation of the magnet in the heart pump through magnetic excitation, thus starting to pump blood. The magnet in the heart pump has opposite magnetism to the magnet adhered to the contact-separation triboelectric nanogenerator module. When the magnet in the pump rotates to the corresponding position, due to the attraction between opposite poles, the copper foil adhered with the magnet starts to separate from the outer PTFE plate. After the magnet in the pump rotates out of the corresponding position, the attraction between opposite poles gradually weakens, the magnetic excitation starts to disappear, and the copper foil returns to the initial position and contacts the PTFE plate, generating an electrical signal. The magnet in the pump continuously cuts the magnetic induction lines of the coil placed flat on the bracket, generating an electrical signal. When the initial rotation speed frequency of the pump is relatively low, the induced electromotive force is small and the voltage signal is difficult to detect. The output electrical signal frequency of the contact-separation triboelectric nanogenerator module is used to represent the rotation speed of the pump. When the pump speed is relatively high, due to mechanical rigidity problems, the contact-separation triboelectric nanogenerator module is difficult to respond in a timely manner, and the output of the electromagnetic power generation module is used to represent the rotation speed of the pump. By comparing the output of the independent layer triboelectric nanogenerator module with the outputs of the two, the actual operating state of the pump can be obtained in a timely manner.

[0026] When the blood state in the artificial heart pump changes, it may generate resistance to the rotation of the impeller, causing the impeller to slow down or stop. At this time, the "lost rotation" phenomenon occurs, that is, the rotation speed of the impeller of the artificial heart pump is less than the rotation speed of the motor shaft of the motor. At this time, we can compare the combined output of the electromagnetic generator and the contact-separation triboelectric nanogenerator representing the rotation speed of the artificial heart pump with the independent layer triboelectric nanogenerator to obtain the actual operating state of the pump. If the output frequencies of the two do not match, it will pose a threat to the life and health of the user.

[0027] The present invention relates to a monitoring device for the operating state of an artificial heart pump. An independent layer-type triboelectric nanogenerator module is clamped on the motor shaft of the device to record the actual rotational speed of the motor. A magnet holder is clamped at the top of the motor shaft. There are three grooves in the magnet holder, and magnets are embedded in them. When the magnet holder rotates with the motor shaft, the magnets on it will exert an exciting effect on the magnets in the pump, driving the impeller in the pump to rotate. The magnets in the pump will cut the magnetic induction lines of the coil placed flat on the bracket, and at the same time will exert an exciting effect on the magnets of the cantilever beam-type triboelectric nanogenerator adhered to the bracket, driving the copper foil adhered with the magnets to continuously contact and separate from the PTFE plate. When the rotational speed is low, the induced electromotive force generated by the electromagnetic power generation module is small, and the output frequency of the contact-separation type triboelectric nanogenerator represents the actual rotational speed of the pump. When the rotational speed is high, it is difficult for the triboelectric nanogenerator to respond in a timely manner due to mechanical rigidity. At this time, the output frequency of the electromagnetic generator represents the actual rotational speed of the pump. Comparing the outputs of the two with the output frequency of the independent layer-type triboelectric nanogenerator module can effectively monitor the actual operating state of the pump, remind the doctor to take measures in a timely manner, with high accuracy, and can be widely applied in the field of health care.

Claims

1. A monitoring device for the operating state of an artificial heart pump, characterized in that It includes an artificial heart pump, a magnet holder, a motor, a pump bracket, a top hanging platform, a contact-separation triboelectric nanogenerator module, an electromagnetic power generation module, and an independent-layer triboelectric nanogenerator module. The artificial heart pump is snap-connected to the pump bracket. The pump bracket is screwed to the motor. The motor shaft of the motor is snap-connected to the magnet holder. Magnets that interact with each other are built into the impeller of the artificial heart pump and the magnet holder. The electromagnetic power generation module is composed of coils and is placed flat on the pump bracket. The independent-layer triboelectric nanogenerator module includes a rotor, an insulator material layer, copper electrodes, and a stator. The rotor is snap-connected to the motor shaft. The insulator material layer is adhered to the rotor. The stator is screwed to the motor bracket. A PCB board is adhered to the stator. The copper electrodes are adhered to the PCB board. The insulator material layer is a PTFE film. The contact-separation triboelectric nanogenerator module includes copper foil, a PTFE board, and a magnet. The magnet is adhered to the copper foil and interacts with the magnet built into the impeller. The pump bracket is screwed to the top hanging platform. The top hanging platform is used to install the contact-separation triboelectric nanogenerator module.

2. The artificial heart pump operating state detection device according to claim 1, wherein At low speeds, the magnet in the pump is excited by the magnet on the magnet holder to rotate. At the same time, the magnet block on the copper foil of the contact-separation triboelectric nanogenerator module is excited, causing it to periodically contact and separate from the PTFE board, generating an electrical signal one. At high speeds, the magnet in the pump cuts the coils placed flat on the pump bracket to generate an electrical signal two. The frequencies of the electrical signal one and the electrical signal two represent the rotational speed of the blades in the artificial heart pump. The insulator material layer on the rotor of the independent-layer triboelectric nanogenerator module rotates with the motor shaft and rubs against the copper electrodes on the stator to generate an electrical signal three. The frequency of this electrical signal three represents the rotational speed of the motor. By comparing the two frequencies, the actual operating state inside the artificial heart pump can be obtained.

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