Wireless charger, position prompting method, and implantable medical system

Abstract

A wireless charger, a position prompting method, and an implantable medical system. The wireless charger comprises: a charger body and a position detection unit. A transmitting coil is provided in the charger body, and the transmitting coil is configured to match a receiving coil of an implantable medical device so as to charge the implantable medical device; the position detection unit is provided on the charger body or in the charger body; and the position detection unit comprises a capacitive sensor having a plurality of electrodes so as to detect the relative position between the transmitting coil of the wireless charger and the receiving coil of the implantable medical device.

Description

Wireless charger, location reminder method, and implantable medical system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 22, 2023 with application number 202311785924.2, and priority to the Chinese patent application filed with the China Patent Office on December 22, 2023 with application number 202311787294.2, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of medical device charging, for example, to a wireless charger, a location reminder method, and an implantable medical system. Background Art

[0003] Wireless charging technology requires that the transmitting and receiving coils be aligned to ensure efficient charging. Because the battery and receiving coils of implantable medical devices are located within the human body, visually verifying alignment is difficult. Furthermore, for skull-implanted devices, users have no way of directly observing alignment during charging, creating significant inconvenience.

[0004] Currently, the most mature position detection device uses a Hall effect element installed at the detection end to detect position through magnetic induction. However, this method requires electronic components on both the receiving and transmitting ends. The design principles of implantable medical devices require minimal size and power consumption. Adding an additional Hall effect sensor increases the device's size and power consumption, requiring more space within the body, which is detrimental to the patient's experience and the long-term lifespan of the device's battery. Therefore, there is an urgent need to design a device that can detect position based on the physical characteristics of the implanted device, thereby providing a clear indication of alignment between the charger and the implanted medical device, thereby improving the efficiency and power of wireless charging. Summary of the Invention

[0005] The present application provides a wireless charger, a location reminder method, and an implantable medical system for detecting whether the location of the wireless charger is abnormal.

[0006] The present invention provides a wireless charger suitable for an implantable medical device, including:

[0007] A charger body, wherein a transmitting coil is provided in the charger body, and the transmitting coil is configured to cooperate with the receiving coil of the implantable medical device to charge the implantable medical device;

[0008] A position detection unit is provided on the charger body, and the position detection unit includes a capacitive sensor having a plurality of electrodes and is configured to detect the relative position of the transmitting coil of the wireless charger and the receiving coil of the implantable medical device.

[0009] An embodiment of the present application provides a location reminder method for a wireless charger, which is performed using the wireless charger. The method includes: placing the wireless charger close to the implantable medical device, obtaining an actual capacitance value between multiple electrodes of the position detection unit, and comparing the actual capacitance value with a corresponding reference capacitance value, where the reference capacitance value is the capacitance value between multiple electrodes in the capacitance sensor when the wireless charger and the implantable medical device are aligned; based on the comparison result, determining whether the placement position of the wireless charger is abnormal, and in response to the abnormal placement position of the wireless charger, issuing a location abnormality reminder to the user.

[0010] The present application provides an implantable medical system, comprising: an implantable medical device, wherein the implantable medical device is configured to be implanted in a human body; and the wireless charger as described above.

[0011] The present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by at least one processor, a method for reminding a wireless charger of its location is implemented.

[0012] The present application provides a computer program product, including a computer program / instruction, which implements a location reminder method for a wireless charger when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a diagram of a wireless charger in use according to an embodiment of the present application;

[0014] FIG2 is a schematic diagram of a location reminder system for a wireless charger according to an embodiment of the present application;

[0015] FIG3 is a schematic diagram of a method for reminding a wireless charger of a position according to an embodiment of the present application;

[0016] FIG4 is a schematic diagram of a capacitive sensor of a wireless charger provided in an embodiment of the present application.

[0017] In the figure: 1. Charger body; 2. MCU module; 3. D / A conversion module; 4. Power amplifier module; 5. A / D conversion module; 6. Signal processing module; 7. Excitation electrode; 8. Receiving electrode. DETAILED DESCRIPTION

[0018] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the figures represent identical or similar structures, and thus repeated descriptions thereof will be omitted.

[0019] The words expressing position and direction described in this application are all explained based on the accompanying drawings as examples, but can be changed as needed, and all changes are included in the scope of protection of this application.

[0020] An implantable neurostimulation system (an implantable medical system) mainly includes a stimulator implanted in the patient's body and a programmable device installed outside the patient's body. The relevant neuromodulation technology mainly involves implanting electrodes in specific parts of the tissue of the organism (i.e., target points) through stereotactic surgery, and the stimulator implanted in the patient's body sends electrical pulses to the target points through the electrodes to regulate the electrical activity and function of the corresponding neural structures and networks, thereby improving symptoms and alleviating pain. The stimulator can be any one of an implantable neural electrical stimulation device, an implantable cardiac electrical stimulation system (also known as a pacemaker), an implantable drug delivery system (IDDS) and a lead adapter. Examples of implantable neurostimulation devices include deep brain stimulation (DBS), cortical nerve stimulation (CNS), spinal cord stimulation (SCS), sacral nerve stimulation (SNS), and vagus nerve stimulation (VNS).

[0021] In some embodiments, the stimulator may include an implantable pulse generator (IPG), an electrode wire, and an extension wire arranged between the pulse generator and the electrode wire, and data interaction between the pulse generator and the electrode wire is achieved through the extension wire, and the pulse generator is arranged in the patient's body. In response to the program-controlled instructions sent by the program-controlled device, the sealed battery and circuit are used to provide controllable electrical stimulation energy to the tissue in the body, and one or two controllable specific electrical stimulations are delivered to specific areas of the tissue in the body through the implanted extension wire and electrode wire. The extension wire is used in conjunction with the pulse generator as a transmission medium for the electrical stimulation signal, and transmits the electrical stimulation signal generated by the pulse generator to the electrode wire. The electrode wire delivers electrical stimulation to specific areas of the tissue in the body through the electrode contacts thereon. The stimulator is provided with one or more electrode wires on one side or both sides, and a plurality of electrode contacts are provided on the electrode wire.

[0022] In other embodiments, the stimulator may include only a pulse generator and electrode leads, wherein the pulse generator may be embedded in the patient's skull and the electrode leads may be implanted in the patient's skull. In this case, the pulse generator and the electrode leads are directly connected without the need for extension leads.

[0023] The electrode wire can be a nerve stimulation electrode, and the electrode wire delivers electrical stimulation to a specific area of ​​tissue in the body through a plurality of electrode contacts. The stimulator is provided with one or more electrode wires on one side or both sides, and a plurality of electrode contacts are provided on the electrode wire, and the electrode contacts can be arranged uniformly or non-uniformly in the circumference of the electrode wire. As an example, the electrode contacts can be arranged in an array of 4 rows and 3 columns (a total of 12 electrode contacts) in the circumference of the electrode wire. The electrode contacts may include stimulation contacts and / or collection contacts. The electrode contacts can, for example, be in the shape of a sheet, a ring, a point, or the like.

[0024] In some possible ways, the stimulated in vivo tissue may be the patient's brain tissue, and the stimulated site may be a specific site of the brain tissue. When the patient's disease type is different, the stimulated site is generally different, and the number of stimulation contacts (single source or multiple sources), the use of one or more (single channel or multiple channels) specific electrical stimulation signals, and the stimulation parameter data are also different. It can be considered that when the stimulation contacts used are multi-source, multi-channel (multi-channel), a larger amount of data will be generated compared to a single source or single channel. With reference to Figures 1 to 2, the present application provides a wireless charger suitable for implantable medical devices, comprising: a charger body 1 and a position detection unit.

[0025] The charger body 1 houses a transmitting coil, which is configured to mate with a receiving coil in an implantable medical device to charge the device, such as a pulse generator. When the charging terminal of the charger body 1 is aligned with the receiving terminal of the implantable medical device, the transmitting coil of the charger body 1 and the receiving coil of the implantable medical device are aligned, allowing the charger body 1 to fully charge the implantable medical device.

[0026] The position detection unit is arranged on the charger body 1, that is, the position detection unit can be arranged on the outer surface or inside the charger body 1. For example, the position sensor is arranged on the outer surface of the charger body 1 close to the human body, which can improve the reliability of the relative position detection between the transmitting coil and the receiving coil. The position detection unit is a capacitive sensor including multiple electrodes, which is arranged to detect the relative position of the transmitting coil of the wireless charger and the receiving coil of the implantable medical device.

[0027] In one embodiment, referring to Figures 1 and 2, one of the electrodes is an excitation electrode 7, and the remaining electrodes are receiving electrodes 8. Capacitance is formed between the excitation electrode 7 and the multiple receiving electrodes 8, for example, the capacitance of a sub-capacitance sensor is formed between the excitation electrode 7 and each receiving electrode 8. An excitation signal can be applied to form capacitance between the excitation electrode 7 and the multiple receiving electrodes 8, and the value of the described capacitance can be measured to facilitate subsequent comparison of the capacitance values. The number of receiving electrodes 8 can be 3-20, for example, 3, 5, 8, 9, or 15, and the number is not limited in this embodiment of the application.

[0028] That is to say, the wireless charger in this application is used for implantable medical devices, that is, it is used to wirelessly charge devices installed in the body. Therefore, high requirements are placed on charging requirements, such as efficiency, safety, stability, etc., and the in-vivo devices are kept as unchanged as possible. Only a capacitive sensor for positioning is added to the external charger to achieve fast and efficient charging of the implantable devices in the body. Multiple electrodes are set in the capacitive sensor (i.e., one excitation electrode and multiple receiving electrodes), so that a capacitor combination can be formed. When the charger is attached to the human body for charging, the capacitance value of the capacitor will also change due to the dielectric environment at different positions (i.e., the dielectric environment between the electrodes at both ends of the capacitor is different). Therefore, the capacitance value combination of multiple capacitors is different at different charging positions of the charger. Therefore, the position of the capacitive sensor can be determined according to the capacitance value combination in the capacitive sensor to determine the relative position between the transmitting coil and the receiving coil.

[0029] The excitation electrode 7 and the plurality of receiving electrodes 8 are arranged on the same plane to form a planar capacitive sensor.

[0030] It can be understood that the plane direction of the planar capacitive sensor is consistent or approximately consistent with the contact plane of the wireless charging and the receiving end of the implantable medical device. In this way, multiple electrodes in the planar capacitive sensor can form multiple capacitors based on the same plane. Given that when charging the implantable medical device, the external charger needs to fit the human body as much as possible or completely, the capacitors arranged in a plane can more accurately and efficiently reflect the position of the charger. Therefore, the position of the planar capacitive sensor can be determined according to the combination of capacitance values ​​in the planar capacitive sensor to determine the relative position between the transmitting coil and the receiving coil.

[0031] In some other embodiments, the excitation electrode 7 and at least one of the plurality of receiving electrodes 8 are not coplanar with the remaining electrodes. In other words, the capacitive sensor structure can also be non-planar. For example, the capacitive sensor structure can be adjusted according to the internal structure of an external charger to achieve a compact charger structure. Of course, it is also necessary to form multiple capacitance combinations at different positions using multiple electrodes, which can also facilitate rapid positioning of the charger.

[0032] The position detection unit further includes a flexible circuit board on which multiple electrodes are disposed. The flexible circuit board facilitates the installation and configuration of the electrodes. The electrodes may be metal electrodes, which are disposed on the flexible circuit board using a metal coating to form a planar capacitive sensor structure.

[0033] It should be noted that the size of the electrodes in this application can be adjusted according to the size of the entire wireless charger and the charging part of the implantable medical device.

[0034] As an optional method, multiple receiving electrodes 8 are arranged around the excitation electrode 7; that is, the excitation electrode 7 can be used as the center, and the receiving electrodes 8 can be evenly distributed around the center, which facilitates the batch assembly of electrodes. In some other embodiments, the positional relationship between the excitation electrode and the receiving electrode is not fixed, that is, the receiving electrodes are randomly arranged around the excitation electrode, which achieves the randomness of the capacitance value in the capacitive sensor and improves the reliability of the relative position between the transmitting coil and the receiving coil.

[0035] Each electrode (including the excitation electrode 7 and the receiving electrode 8 ) is independently wired and led to the output end of the position detection unit.

[0036] In one embodiment, the position detection unit further includes a microcontroller unit (MCU) module 2, a digital-to-analog (D / A) conversion module 3, a power amplification module 4, an analog-to-digital (A / D) conversion module 5 and a signal processing module 6.

[0037] Among them, the MCU module 2 is configured to record multiple capacitance values ​​in the capacitance sensor, the output end of the MCU module 2 is electrically connected to the D / A conversion module 3, the D / A conversion module 3 is electrically connected to the power amplifier module 4, and the power amplifier module 4 is electrically connected to the excitation electrode 7, so that the MCU module 2 can apply or load the excitation signal to the excitation electrode 7.

[0038] The receiving electrode 8 is electrically connected to the signal processing module 6 , the signal processing module 6 is electrically connected to the A / D conversion module 5 , and the A / D conversion module 5 is electrically connected to the input end of the MCU module 2 .

[0039] The MCU module 2 generates an excitation signal which is then loaded onto the excitation electrode after passing through the D / A conversion module 3 and the power amplifier module 4. The signal received by the receiving electrode 8 is then sent to the MCU module 2 after passing through the signal processing module 6 and the A / D conversion module 5. As a result, after the excitation electrode 7 receives the excitation signal, a capacitance is formed between the receiving electrode 8 and the excitation electrode 7, and the probe at the receiving end of the MCU module 2 can detect the value of the formed capacitance. The MCU module 2 can compare the detected capacitance value with the reference recorded value to calculate the difference, and estimate the relative position of the current transmitting coil of the wireless charger and the receiving coil of the implanted medical device based on the size of the difference. The reference recorded value (i.e., the reference capacitance value) is, for example, when the charging end of the charger body 1 is aligned with the receiving end of the implanted medical device, the transmitting coil of the charger body 1 is completely aligned with the receiving coil of the implanted medical device, and the charger body 1 is charging the implanted medical device at full efficiency. The capacitance value measured by the MCU module 2 is the value set of multiple capacitances of the capacitance sensor when the transmitting coil and the receiving coil are aligned.

[0040] As an example, nine electrodes may be provided, with the excitation electrode 7 disposed in the middle of the eight receiving electrodes 8. The eight receiving electrodes 8 are distributed in a ring or elliptical shape, and the angle between the line connecting two adjacent receiving electrodes 8 and the excitation electrode 7 is 45°. In other examples, the relative positional relationship between each receiving electrode and the excitation electrode may also vary. For example, the distance between the receiving electrode and the excitation electrode, the angle between the line connecting two adjacent receiving electrodes and the excitation electrode, etc. may also vary, as long as capacitance at multiple different positions can be obtained.

[0041] It should be noted that the number of electrodes can be adjusted according to the actual detection accuracy. When the number of receiving electrodes 8 is greater, the angle between the connecting lines of adjacent receiving electrodes 8 and the excitation electrodes 7 is smaller, and the degree of offset of the relative position between the wireless charger and the implanted medical device can be judged more accurately during actual charging; conversely, the lower the accuracy of the offset of the relative position between the wireless charger and the implanted medical device, of course, the greater the number of receiving electrodes 8, the higher the required hardware cost and assembly cost will be. Therefore, the number and position of the receiving electrodes 8 can be set according to actual conditions.

[0042] It should be noted that, from a circuit structure perspective, the electrodes are divided into two categories: excitation electrodes 7 and receiving electrodes 8, and the excitation electrode 7 is set in the middle of the receiving electrode 8, that is, the excitation electrode 7 is located in the middle position of the capacitive sensor. When the charging end of the wireless charger is facing the receiving end of the implanted medical device, a corresponding reference capacitance can be formed between the excitation electrode 7 and each receiving electrode 8. At the same time, the MCU module 2 needs to record the position of the excitation electrode 7 and each receiving electrode 8. When the wireless charger is actually charging the implanted medical device, the difference between the actual capacitance value measured by the wireless charger MCU module 2 and the reference capacitance value at the corresponding position is compared. According to the size of the difference, the offset degree between the current wireless charger's transmitting coil and the implanted medical device's receiving coil can be estimated, thereby assisting the user to adjust the charger position so that its charging end is facing the receiving end of the implanted medical device; the offset degree between the current wireless charger's transmitting coil and the implanted medical device's receiving coil can also be estimated according to the size of the ratio by comparing the actual capacitance value measured by the wireless charger MCU module 2 with the reference capacitance value at the corresponding position.

[0043] According to the principle of capacitive sensors, the capacitance of a capacitor is affected by the dielectric constant of the medium between its two electrodes. For example, in the case of an implantable medical device, such as a brain implant, after the device is implanted in the human skull, the dielectric constant between the electrodes changes due to the presence of the skull. When the transmitting coil is in different positions, the excitation and receiving electrodes cover different areas of the skull. This can result in the transmitting coil being completely above the implant in some areas and slightly offset in others. This offset inevitably leads to differences in the capacitance between the receiving and excitation electrodes. In other words, based on the principle of capacitive sensors, the deviation of the transmitting coil from a preset position (i.e., a fully aligned position) can be determined by changes in capacitance. The multiple planar capacitors in the capacitive sensor are located at different locations within the sensor, so when the sensor is adjusted, the positions and changes in the positions of the multiple capacitors differ. Therefore, the actual position of the capacitive sensor can be accurately determined by the positional changes of the multiple capacitors.

[0044] Therefore, since the capacitance value of the capacitive sensor is affected by the dielectric constant between the electrodes, the capacitance value measured by a wireless charger including a capacitive sensor composed of multiple electrodes when charging an implantable medical device can be compared with the baseline recorded value of the capacitive sensor. By checking whether there is a difference in the comparison results, it is possible to indirectly detect whether the transmitting coil of the wireless charger and the receiving coil of the implantable medical device are aligned, thereby assisting the user in adjusting the position of the wireless charger.

[0045] In this application, the distribution shape and number of electrodes are not limited to the layout shown in Figure 2. They can be modified based on the shape and accuracy of the implantable medical device to be detected, and can also achieve the corresponding position detection purpose. This application is not only suitable for assisting in guiding the alignment of the transmitting coil and the transmitting coil during the charging process of a wireless charger, but is also applicable to all situations where the position of an implantable medical device needs to be detected.

[0046] The present application provides a location reminder method for a wireless charger, which is performed using the above-mentioned wireless charger, and the method includes the following steps.

[0047] Step S1: placing the wireless charger close to the implantable medical device, obtaining actual capacitance values ​​between multiple electrodes of the position detection unit, and comparing the actual capacitance values ​​with reference capacitance values;

[0048] Step S2: judging whether the placement position of the wireless charger is abnormal based on the comparison result; if the placement position of the wireless charger is abnormal, issuing an abnormal position reminder to the user.

[0049] It can be understood that since the capacitance sensor includes a capacitance of multiple sub-capacitance sensors formed by multiple electrodes, the actual capacitance value detected by the position detection unit should be a set of multiple capacitance values. When performing capacitance comparison, it should be a comparison of the capacitances at the same position in the capacitance sensor, and then a compared set is obtained. The actual capacitance value is compared with the reference capacitance value, which can be: the difference between the actual capacitance value and the reference capacitance value; or the ratio of the actual capacitance value to the reference capacitance value.

[0050] In some other embodiments, the actual capacitance value and the reference capacitance value are compared by performing calculations according to preset rules. The preset rules may be specific functions, etc., which are not limited in the embodiments of this specification.

[0051] The method further includes: step S0, which can be performed before step S1.

[0052] Step S0: placing the wireless charger at a reference charging position of the implantable medical device, and obtaining reference capacitance values ​​of a plurality of sub-capacitance sensors of the capacitance sensor.

[0053] Among the above-mentioned multiple electrodes, one electrode is selected as the excitation electrode 7 and the remaining electrodes are the receiving electrodes 8 . Capacitors are formed between the excitation electrode 7 and the multiple receiving electrodes 8 .

[0054] In step S1, the wireless charger is placed close to the implantable medical device to obtain actual capacitance values ​​between multiple electrodes of the position detection unit, including:

[0055] The wireless charger is placed close to the implantable medical device to obtain the actual capacitance values ​​of the excitation electrode 7 and the plurality of receiving electrodes 8 .

[0056] Wherein, step S0 further includes: moving the wireless charger from the reference charging position by a preset distance in multiple directions, and obtaining a change trend of the capacitance value by comparing the change between the capacitance value measured after the movement and the reference capacitance value;

[0057] In step S1, based on the comparison result, it is determined whether the placement position of the wireless charger is abnormal, including: based on the comparison result, determining the distance difference between the placement position of the wireless charger and the reference charging position, determining whether the placement position of the wireless charger is abnormal, and providing direction guidance.

[0058] In an application scenario:

[0059] The number of electrodes is selected as nine, including one excitation electrode 7 and eight receiving electrodes 8. When the wireless charger position reminder method is applied to the charging scenario of a medical device implanted in the human skull, due to individual differences in people, the capacitance values ​​between the receiving electrodes 8 and the excitation electrodes 7 at multiple positions during alignment need to be recorded before step S0. Then record the capacitance value when the offset in the four directions of front, back, left and right is 10mm. Move left 10mm and the measured capacitance value is Move right 10mm, the measured capacitance value is Move forward 10mm, the measured capacitance value is Move back 10mm, the measured capacitance value is By analyzing the degree of change between the capacitance values ​​measured by moving 10mm in the four directions of front, back, left, and right and the baseline capacitance values ​​at the corresponding positions, the change trend of the capacitance values ​​of different individuals is obtained. When charging with the wireless charger, when the transmitting coil and the receiving coil of the wireless charger are in different positions, the wireless charger will use the difference between the measured capacitance values ​​of the excitation electrode 7 and each receiving electrode 8 and the baseline capacitance values ​​at the corresponding positions to remind the position of the wireless charger, and then compare the capacitance values ​​after moving 10mm in the front, back, left, and right directions to determine the distance difference from the center position where the recording is started. Since there are corresponding receiving electrodes 8 in multiple directions in the plane, direction guidance can be given in two-dimensional space.

[0060] The wireless charger location reminder method of this embodiment determines the distance difference between the placement location of the wireless charger and the reference charging location based on the comparison result, including:

[0061] Through historical data, the corresponding relationship between multiple capacitance changes and distance changes is established;

[0062] The difference between the actual capacitance value and the reference capacitance value is calculated, and based on the difference and the corresponding relationship between the capacitance change and the distance change, the distance difference of the wireless charger relative to the reference charging position is determined and recorded.

[0063] The working principle of the above technical solution is: through historical data, multiple corresponding relationships between capacitance changes and distance changes are established: this part can be achieved by collecting a large amount of historical data from different locations and different individuals, and drawing a relationship curve between capacitance value and distance change.

[0064] Different individuals here refer to patients using the same device and the same implant depth range.

[0065] An instruction manual is required. Since patients have different physical conditions and the implantation parameters of the device (such as implantation depth, position, etc.) will also be different, the corresponding relationship between capacitance value and distance change can be set for different patients. This can improve the accuracy of the corresponding relationship determination, thereby improving the accuracy and reliability of the wireless charger positioning.

[0066] Obtain multiple capacitance values ​​of the wireless charger at the current location as actual capacitance values; calculate the difference between the actual capacitance value and the reference capacitance value; and determine and record the real-time location of the wireless charger based on the difference and the corresponding relationship between capacitance change and distance change:

[0067] This part primarily calculates and records real-time location. When the wireless charger is at a certain location, the sensor acquires multiple capacitance values ​​at that location in real time as the actual capacitance value. The difference between the actual capacitance value and the reference capacitance value is then calculated. Based on this difference and the relationship between capacitance change and distance change, the real-time location of the wireless charger can be determined and recorded.

[0068] The effect of the above technical solution is that by more accurately determining the position of the wireless charger, the wireless charger can be charged at the reference charging position, thereby improving charging efficiency. This method can provide more power within a limited time, meeting various usage requirements. Because this embodiment adopts the method of obtaining the capacitance value and calculating the difference in real time, the position of the wireless charger can be adjusted in a timely manner so that it remains at the reference charging position for charging. This method of reducing power consumption can extend the service life of the wireless charger and reduce the negative impact on the environment.

[0069] The location reminder method of the wireless charger in this embodiment, wherein the corresponding relationship between multiple capacitance changes and distance changes is established through historical data, includes:

[0070] Obtain capacitance values ​​of multiple sub-capacitance sensors in a surface capacitance sensor after the wireless charger moves a preset distance in different preset directions from a reference charging position; the capacitance values ​​after the movement are (C1i, C2i…CNi); where i is the number of each movement, i.e., the i-th movement; the value is a positive integer; the preset distance can be 5 mm, 10 mm, or 20 mm; there is one excitation electrode and N is the number of receiving electrodes, where N is greater than or equal to 3; the excitation electrode is located in the middle of the capacitance sensor, and multiple receiving electrodes are evenly distributed around it at the same angle; the reference capacitance value is (C10, C20…CN0).

[0071] Subtracting the capacitance values ​​of the multiple sub-capacitance sensors after movement from the corresponding reference capacitance values ​​to obtain a plurality of capacitance value differences; the plurality of capacitance value differences are: DeltaC1i=C1i-C10, DeltaC2i=C22-C20, DeltaC1i=CNi-CN0;

[0072] Based on multiple preset movement distances and capacitance differences, multiple corresponding relationships between capacitance changes and distance changes are established; the corresponding relationship is DeltaC = F(d); where DeltaC is the capacitance change, F(d) is the functional relationship, and d is the distance between the actual position of the capacitor and the reference charging position.

[0073] Of course, the relationship between capacitance and position can also be established. By using debugging data and historical data, a capacitance and charging efficiency curve can be created and updated in real time. This curve can reflect the relationship between capacitance and charging efficiency, providing a reference for subsequent position correction and charging efficiency optimization.

[0074] In summary, the above part of this embodiment mainly realizes the calculation and recording of real-time position by obtaining debugging data and historical data and establishing a correspondence between multiple capacitance changes and distance changes. This method is mainly based on the analysis of historical data and the measurement of actual capacitance values ​​to indirectly obtain the location information of the wireless charger. Through the above working principle, the wireless charger location reminder method of this embodiment can achieve the advantages of accuracy, efficiency, ease of use, cost reduction and wide application, and provides an effective solution to the positioning problem of implantable medical devices and other wireless charging devices.

[0075] The method for reminding a wireless charger of its position in this embodiment calculates the difference between the actual capacitance value and the reference capacitance value, and determines and records the distance difference of the wireless charger relative to the reference charging position based on the difference and the corresponding relationship between the capacitance change and the distance change, including:

[0076] Calculate the difference between the actual capacitance value and the reference capacitance value;

[0077] According to the difference and the corresponding relationship between the multiple capacitance changes and the distance changes, the distances of different sub-capacitance sensors relative to the reference charging position are obtained; that is, the distances of different receiving electrodes from the reference charging position;

[0078] Obtain first position information of the wireless charger based on the distances of multiple different capacitors relative to a reference charging position and record the first position coordinates; wherein the first position coordinates are (XC1, YC1);

[0079] The first position information is corrected by recording the capacitance value and the position thereof in the historical records to obtain the final position information and record the final position information.

[0080] It can be understood that since the correspondence between capacitance change and distance change is calibrated in advance through historical data, the correspondence is obtained through fitting, so the position information obtained through the correspondence is also an inference result close to the actual position. Therefore, in order to obtain more accurate and reliable data, the first position information can also be corrected, that is, the first position information is corrected and adjusted through the data in the historical records to improve the reliability of the position information.

[0081] In the embodiment of this specification, the first position information is corrected to obtain the final position information and record the final position information by recording the capacitance value and its position in the historical record, including:

[0082] Obtain the capacitance values ​​of all position records recorded in the historical records;

[0083] Using the capacitance value closest to the actual capacitance value among the capacitance values ​​recorded in the historical records as the correction capacitance, and determining the correction coordinates corresponding to the correction capacitance;

[0084] The first position information is corrected according to the corrected coordinates to obtain final position information.

[0085] It can be understood that this article is corrected through historical data. The historical data can be the data recorded for the entire time the wireless charger is working after the implantable medical device is implanted in the patient's body. By correcting the historical data, the positioning data of the wireless charger during previous use can be referred to, which can avoid excessive positioning deviation of the current position, thereby improving the accuracy of positioning.

[0086] The method further comprises: using a capacitance value closest to the actual capacitance value among the capacitance values ​​recorded in the historical records as a correction capacitance, and determining a correction coordinate corresponding to the correction capacitance, including:

[0087] Calculating the similarity between the capacitance value recorded at each position in the historical record and the actual capacitance value;

[0088] If the highest similarity exceeds a preset threshold, the capacitance value corresponding to the highest similarity is used as the corrected capacitance value, and the corrected coordinates corresponding to the corrected capacitance value are determined.

[0089] If the highest similarity does not exceed a preset threshold, the first location information is used as the final location information.

[0090] It can be understood that the similarity can represent the distance between the two. The higher the similarity, the closer the distance. Conversely, the lower the similarity, the farther the distance. Since the capacitance at each position should be in multiple groups, equivalent to a capacitance matrix, the capacitance at the same position in the capacitance matrix can be compared, such as by difference calculation, percentage change calculation, etc., and then integrated to obtain the final similarity. There are also other ways to calculate the similarity, which will not be described in detail in this embodiment of the specification.

[0091] In practice, due to issues like the frequency and duration of wireless charger use, historical data may not be very extensive. Consequently, the closest corrected coordinates may be some distance away from the current location. This makes corrections meaningless and increases the error in the final location. Therefore, by setting a preset threshold, only correcting the coordinates when the similarity exceeds the threshold can improve the reliability and accuracy of the correction. The preset threshold can be between 90% and 98%, such as 90%, 92%, or 95%.

[0092] In the embodiment of this specification, the first position information is corrected according to the corrected coordinates to obtain the final position information, including:

[0093] determining a correction weight of the corrected coordinates according to a distance between the corrected capacitance and the actual capacitance value;

[0094] determining a correction formula for the first position information according to the correction weight;

[0095] The corrected coordinates and the first position information are substituted into the correction formula to obtain the final position information.

[0096] It can be understood that the distance between the correction capacitance and the actual capacitance value reflects the distance between the correction coordinates and the current position to a certain extent. Therefore, when the distance between the two is large, the correction change of the current position will be relatively large during the correction process, and it may deviate further from the true position. The correction mentioned in this article should be fine-tuning, that is, a slight position adjustment is made based on the current position to make it closer to the true position. Therefore, during the correction process, corresponding correction weights can be set for the correction coordinates and the current position, thereby improving the accuracy of the correction.

[0097] Among them, a corresponding correction weight can be set according to the distance between the correction capacitor and the actual capacitance value. For example, when the distance is large, a smaller correction weight of the correction coordinate is set, and when the distance is small, a larger correction weight of the correction coordinate is set, thereby determining the final correction formula. Optionally, the correction weight and the distance (i.e., the distance between the correction capacitor and the actual capacitance value) can be determined by a set functional relationship or by a lookup table.

[0098] Exemplarily, the similarity can be calculated as follows: CZj=C1j+C2j+…+CNj; Cij is the difference between the capacitance in the historical record and the current capacitance, CZj is the similarity, the smaller the CZj value, the higher the similarity, and the larger the value, the lower the similarity. Among the j groups of capacitors in the historical record, a group of capacitors corresponding to the smallest CZj value (i.e., the highest similarity) is selected as the second reference (i.e., the corrected capacitor), and the position coordinates of the second reference are obtained. According to the second reference, the current second position coordinates (i.e., the corrected coordinates) (XC2, YC2) are calculated; the correction formula can be expressed as follows: (w1*XC1+w2*XC2, w1*YC1+w2*YC2); wherein, w1 and w2 are correction weights, w1+w2=1.

[0099] In summary, the above-mentioned portion of this embodiment obtains the wireless charger's location information by acquiring multiple capacitance values ​​of the wireless charger in real time and calculating the difference, combining the correspondence between capacitance change and distance change. The accuracy and real-time nature of the location information are further improved by correcting historical records and performing a weighted average. This method comprehensively considers the influence of multiple capacitance values ​​and historical data to obtain more accurate location information.

[0100] The effect of the above technical solution is: by obtaining multiple capacitance values ​​of the wireless charger in real time and calculating the difference, and combining the correspondence between capacitance change and distance change to obtain the position information of the wireless charger, the position of the wireless charger can be determined more accurately. By obtaining the current capacitance value and comparing it with the capacitance value in the historical record, the change in capacitance value can be discovered in time and the position information can be updated to meet the needs of fast charging. By correcting the first position information and recording the position record based on the capacitance value in the historical record to obtain the final position information and record the final position information, the impact of environmental changes and other interference factors can be reduced, and the stability and reliability of the position information can be improved. By fusing multiple position information through the weighted average method, it can adapt to different usage environments and scenarios, including but not limited to implantable medical devices and other wireless charging devices.

[0101] The present application also provides a position reminder device for a wireless charger, wherein the charger charges an implantable medical device, the implantable medical device includes a receiving coil implanted in the body, and the charger includes a charger body 1 and a position detection unit; the position detection unit includes a capacitance sensor, the capacitance sensor includes multiple receiving electrodes and an excitation electrode, and a sub-capacitance sensor is formed between each receiving electrode and the excitation electrode. The position reminder device includes: an acquisition and comparison module, which is configured to bring the wireless charger close to the implantable medical device, obtain the actual capacitance value between the multiple electrodes of the position detection unit, and compare the actual capacitance value with the reference capacitance value; a result judgment module, which is configured to judge whether the placement position of the wireless charger is abnormal based on the comparison result, and if the placement position of the wireless charger is abnormal, issue a position abnormality reminder to the user.

[0102] In an embodiment of the present application, a wireless charger including a capacitive sensor composed of multiple electrodes can compare the capacitance value measured when charging an implantable medical device with the reference capacitance value of the capacitive sensor. These real-time capacitance values ​​reflect the current state and position of the wireless charger. Based on the real-time capacitance value and the reference capacitance value, the real-time position of the wireless charger is calculated by an algorithm or model. This calculation can be based on a mathematical model or a machine learning algorithm. By comparing whether there is a difference in the results, it can be indirectly detected whether the transmitting coil of the wireless charger is aligned with the receiving coil of the implantable medical device. According to the real-time position of the wireless charger, the difference between the real-time position and the reference position can be determined to determine the direction of movement. This direction of movement can be intuitively guided by a visual terminal (such as a screen or indicator), or it can be automatically adjusted by controlling the moving mechanism to assist the user in adjusting the position of the wireless charger.

[0103] In one embodiment, the apparatus further comprises: a reference capacitance acquisition module configured to place the wireless charger at a reference charging position of the implantable medical device and acquire reference capacitance values ​​of a plurality of sub-capacitance sensors of the capacitive sensor.

[0104] In one embodiment, the acquisition and comparison module is configured to: place the wireless charger close to the implantable medical device to acquire actual capacitance values ​​of the excitation electrode 7 and the plurality of receiving electrodes 8 .

[0105] In one embodiment, after the wireless charger is placed close to the implantable medical device and the actual capacitance values ​​of the excitation electrode 7 and the multiple receiving electrodes 8 are obtained, the apparatus further comprises: a debugging data acquisition module configured to move the wireless charger by a preset distance in multiple directions from a reference charging position, and to derive a change trend of the capacitance value by measuring the degree of change between the capacitance values ​​of the multiple sub-capacitance sensors measured after the movement and the reference capacitance value.

[0106] In one embodiment, the result judgment module is configured to judge the distance difference between the placement position of the wireless charger and the reference charging position based on the comparison result, and judge whether the placement position of the wireless charger is abnormal based on the distance difference, and provide direction guidance.

[0107] In one embodiment, the result judgment module includes: a correspondence establishment module, configured to establish a plurality of correspondences between capacitance changes and distance changes through historical data; a position determination module, configured to calculate the difference between the actual capacitance value and the reference capacitance value, and determine and record the distance difference of the wireless charger relative to the reference charging position based on the difference and the correspondence between the capacitance change and the distance change.

[0108] In one embodiment, the correspondence establishment module is configured to obtain capacitance values ​​of multiple sub-capacitance sensors in the surface capacitance sensor after the wireless charger moves from a reference charging position to different preset directions and preset distances; the capacitance value after the movement is (C1i, C2i...CNi); where i is the number of each movement, that is, the i-th movement; the value is a positive integer; the preset distance can be 5mm, 10mm, or 20mm; there is one excitation electrode and the number of receiving electrodes is N, where N≥3; the excitation electrode is located in the middle of the capacitance sensor, and multiple receiving electrodes are evenly distributed around it at the same angle; the reference capacitance value is (C10, C20...CNi); N0); subtracting the capacitance values ​​of the multiple sub-capacitance sensors after movement from the corresponding reference capacitance values ​​to obtain multiple capacitance value differences; the multiple capacitance value differences are: DeltaC1i=C1i-C10, DeltaC2i=C22-C20, DeltaC1i=CNi-CN0; based on the multiple preset movement distances and the multiple capacitance value differences, establishing a correspondence between the capacitance change and the distance change of the multiple sub-capacitance sensors; the correspondence is DeltaC=F(d); wherein DeltaC is the capacitance change, F(d) is the functional relationship, and d is the distance between the actual position of the capacitor and the reference charging position.

[0109] The working principle of the above technical solution is: through historical data, multiple corresponding relationships between capacitance changes and distance changes are established: this part can be achieved by collecting a large amount of historical data from different locations and different individuals, and drawing a relationship curve between capacitance value and distance change.

[0110] In one embodiment, the position determination module is configured to calculate the difference between the actual capacitance value and the reference capacitance value; based on the difference and the correspondence between multiple capacitance changes and distance changes, obtain the distances of different sub-capacitance sensors relative to the reference charging position; that is, the distances of different receiving electrodes from the reference charging position; obtain the first position information of the wireless charger through the distances of multiple different capacitances relative to the reference charging position and record the first position coordinates; wherein the first position coordinates are (XC1, YC1); correct the first position information through the capacitance value and its position record in the historical record to obtain the final position information and record the final position information.

[0111] It can be understood that since the correspondence between capacitance change and distance change is calibrated in advance through historical data, the correspondence is obtained through fitting, so the position information obtained through the correspondence is also an inference result close to the actual position. Therefore, in order to obtain more accurate and reliable data, the first position information can also be corrected, that is, the first position information is corrected and adjusted through the data in the historical records to improve the reliability of the position information.

[0112] In one embodiment, the position determination module is configured to obtain the capacitance values ​​on all position records recorded in the historical records; use the capacitance value in the historical records that is closest to the actual capacitance value as a correction capacitance, and determine the correction coordinates corresponding to the correction capacitance; and correct the first position information according to the correction coordinates to obtain the final position information.

[0113] It can be understood that this article is corrected through historical data. The historical data can be the data recorded for the entire time the wireless charger is working after the implantable medical device is implanted in the patient's body. By correcting the historical data, the positioning data of the wireless charger during previous use can be referred to, which can avoid excessive positioning deviation of the current position, thereby improving the accuracy of positioning.

[0114] In one embodiment, the location determination module is configured to calculate the similarity between the capacitance value of each location record in the historical record and the actual capacitance value; if the highest similarity exceeds a preset threshold, the capacitance value corresponding to the highest similarity is used as the corrected capacitance value, and the corrected coordinates corresponding to the corrected capacitance value are determined. If the highest similarity does not exceed the preset threshold, the first location information is used as the final location information.

[0115] It can be understood that the similarity can represent the distance between the two. The higher the similarity, the closer the distance. Conversely, the lower the similarity, the farther the distance. Since the capacitance at each position should be in multiple groups, equivalent to a capacitance matrix, the capacitance at the same position in the capacitance matrix can be compared, such as by difference calculation, percentage change calculation, etc., and then integrated to obtain the final similarity. There are also other ways to calculate the similarity, which will not be described in detail in this embodiment of the specification.

[0116] In one embodiment, the position determination module is configured to determine a correction weight of the corrected coordinates based on the distance between the corrected capacitance and the actual capacitance value; determine a correction formula for the first position information based on the correction weight; and bring the corrected coordinates and the first position information into the correction formula to obtain the final position information.

[0117] It can be understood that the distance between the correction capacitor and the actual capacitance value reflects the distance between the correction coordinates and the current position to a certain extent, so when the distance between the two is large, during the correction process, the correction change of the current position will be relatively large, and thus may deviate further from the true position, and the correction described in this article should be fine-tuning, that is, still based on the current position for a slight position adjustment to make it closer to the true position. Therefore, in the process of correction, corresponding correction weights can be set for the correction coordinates and the current position, thereby improving the accuracy of the correction, wherein, the corresponding correction weight can be set according to the distance between the correction capacitor and the actual capacitance value, such as, when the distance is large, a smaller correction weight for the correction coordinates is set, and when the distance is small, a larger correction weight for the correction coordinates is set, thereby determining the final correction formula. Optionally, the correction weight and the distance (i.e., the distance between the correction capacitor and the actual capacitance value) can be determined by a set functional relationship, or by a look-up table.

[0118] Exemplarily, the similarity can be calculated as follows: CZj=C1j+C2j+…+CNj; Cij is the difference between the capacitance in the historical record and the current capacitance, CZj is the similarity, the smaller the CZj value, the higher the similarity, and the larger the value, the lower the similarity. Among the j groups of capacitors in the historical record, a group of capacitors corresponding to the smallest CZj value (i.e., the highest similarity) is selected as the second reference (i.e., the corrected capacitor), and the position coordinates of the second reference are obtained. According to the second reference, the current second position coordinates (i.e., the corrected coordinates) (XC2, YC2) are calculated; the correction formula can be expressed as follows: (w1*XC1+w2*XC2, w1*YC1+w2*YC2); wherein, w1 and w2 are correction weights, w1+w2=1.

[0119] In summary, the above-mentioned portion of this embodiment obtains the wireless charger's location information by acquiring multiple capacitance values ​​of the wireless charger in real time and calculating the difference, combining the correspondence between capacitance change and distance change. The accuracy and real-time nature of the location information are further improved by correcting historical records and performing a weighted average. This method comprehensively considers the influence of multiple capacitance values ​​and historical data to obtain more accurate location information.

[0120] The effect of the above technical solution is: by obtaining multiple capacitance values ​​of the wireless charger in real time and calculating the difference, and combining the correspondence between capacitance change and distance change to obtain the position information of the wireless charger, the position of the wireless charger can be determined more accurately. By obtaining the current capacitance value and comparing it with the capacitance value in the historical record, the change in capacitance value can be discovered in time and the position information can be updated to meet the needs of fast charging. By correcting the first position information and recording the position record based on the capacitance value in the historical record to obtain the final position information and record the final position information, the impact of environmental changes and other interference factors can be reduced, and the stability and reliability of the position information can be improved. By fusing multiple position information through the weighted average method, it can adapt to different usage environments and scenarios, including but not limited to implantable medical devices and other wireless charging devices.

[0121] An embodiment of the present application also provides a wireless charger location reminder system, comprising the aforementioned location reminder device and the wireless charger. The wireless charger comprises a transmitting coil and a position detection unit, wherein the position detection unit is configured to detect the relative position of the transmitting coil of the wireless charger and the receiving coil of the implantable medical device to provide alignment guidance for the transmitting coil and the implantable medical device; the position detection unit comprises a capacitive sensor, wherein the capacitive sensor comprises a plurality of sub-capacitive sensors formed between an excitation electrode and a plurality of receiving electrodes arranged around the excitation electrode.

[0122] In addition, the present application also provides an implantable medical system, comprising: an implantable medical device and the above-mentioned wireless charger. The implantable medical device is used to be implanted in the human body. Since the wireless charger has a capacitive sensor composed of multiple electrodes, according to the capacitive sensor principle formula The capacitance value of a capacitive sensor is affected by the dielectric constant ε of the medium between the two electrodes. After a medical device to be charged is implanted in the human skull, the dielectric constant of the skull changes, and the capacitance value of the capacitive sensor will be different when the medical device is implanted and when it is not. When the wireless charger's transmitting coil is in different positions, the excitation electrode 7 and receiving electrode 8 of the planar capacitive sensor cover different areas of the skull. As a result, in some areas, the transmitting coil is completely or just above the implanted medical device, while in other areas, there will be some deviation in the alignment of the transmitting coil and the receiving coil. This deviation will result in a difference in capacitance between the receiving electrode 8 and the excitation electrode 7. By detecting this difference, it is possible to determine whether the wireless charger's transmitting coil is aligned with the receiving coil of the implanted medical device.

[0123] Based on this wireless charger, it can be specifically applied to the position detection process of medical devices implanted in the human skull. The relative position between the wireless charger and the implanted medical device can be detected according to the change in the dielectric constant of the skull after the implanted medical device is installed, and whether the medical device implanted in the human skull and the wireless charger are facing each other can be indirectly determined. The relative position detection can be performed without changing the structural dimensions of any implanted medical device, which is convenient for patients to use.

[0124] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program. When the computer program is executed, the steps of a wireless charger location reminder method in the embodiment of the present application are implemented. The specific implementation method is the same as the implementation method described in the embodiment of the wireless charger location reminder method described above, and some contents are not repeated here.

[0125] In the present application, a readable storage medium can be any tangible medium that contains or stores a program that can be used by or in combination with an instruction execution system, device, or device. A program product can use any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. Examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM) or flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0126] Computer-readable storage media may include a data signal propagated in baseband or as part of a carrier wave, wherein a readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The readable storage medium may also be any readable medium that can send, propagate, or transmit a program for use by an instruction execution system, device, or component or used in combination therewith. The program code contained on the readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, radio frequency (RF), etc., or any suitable combination thereof. The program code for executing the operation of this application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and also conventional procedural programming languages ​​such as C language or similar programming languages. The program code may be executed entirely on a user computing device, partially on an associated device, as an independent software package, partially on a user computing device, partially on a remote computing device, or entirely on a remote computing device or server. In situations involving a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or it can be connected to an external computing device (for example, through the Internet using an Internet service provider).

[0127] The present application provides a computer program product, including a computer program / instruction, which implements the steps of a wireless charger location reminder method when executed by a processor.

[0128] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limiting the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the application without departing from the principles and purpose of the present application. All of these changes should fall within the scope of protection of the claims of the present application.

Claims

1. A wireless charger, adapted for an implantable medical device, comprising: A charger body (1), wherein a transmitting coil is arranged inside the charger body (1), and the transmitting coil is arranged to cooperate with a receiving coil of the implantable medical device to charge the implantable medical device; A position detection unit is arranged on the charger body (1), and the position detection unit comprises a capacitive sensor having a plurality of electrodes, so as to be arranged to detect the relative position of the transmitting coil of the wireless charger and the receiving coil of the implantable medical device.

2. The wireless charger according to claim 1, wherein: One of the electrodes is an excitation electrode (7), and the remaining electrodes are receiving electrodes (8). Sub-capacitance sensors are formed between the excitation electrode (7) and the plurality of receiving electrodes (8).

3. The wireless charger according to claim 2, wherein: The excitation electrode (7) and the plurality of receiving electrodes (8) are arranged on the same plane to form a planar capacitive sensor.

4. The wireless charger according to claim 2, wherein: The excitation electrode (7) and at least one of the plurality of receiving electrodes (8) are not on the same plane as the remaining electrodes.

5. The wireless charger according to claim 3 or 4, wherein: The plurality of receiving electrodes (8) are arranged around the excitation electrode (7).

6. The wireless charger according to claim 3, wherein: Nine electrodes are provided, the excitation electrode (7) is provided in the middle of the eight receiving electrodes (8), and the angle between the lines connecting two adjacent receiving electrodes (8) and the excitation electrode (7) is 45°.

7. The wireless charger according to claim 2, wherein: The position detection unit further comprises a microcontroller unit MCU module (2), a digital / analog D / A conversion module (3), a power amplification module (4), an analog / digital A / D conversion module (5) and a signal processing module (6); The MCU module (2) is configured to respectively obtain the capacitance values ​​between the excitation electrode and the plurality of receiving electrodes, the output end of the MCU module (2) is electrically connected to the D / A conversion module (3), the D / A conversion module (3) is electrically connected to the power amplifier module (4), and the power amplifier module (4) is electrically connected to the excitation electrode (7); The plurality of receiving electrodes (8) are electrically connected to the signal processing module (6), the signal processing module (6) is electrically connected to the A / D conversion module (5), and the A / D conversion module (5) is electrically connected to an input end of the MCU module (2); The MCU module (2) is configured to determine the relative position of the transmitting coil of the wireless charger and the receiving coil of the implantable medical device based on the capacitance value between the excitation electrode and the plurality of receiving electrodes in the capacitance sensor and the reference capacitance value of the capacitance sensor, wherein the reference capacitance value is the capacitance value between the excitation electrode and the plurality of receiving electrodes in the capacitance sensor when the wireless charger and the implantable medical device are aligned.

8. The wireless charger according to claim 1, wherein: Each of the electrodes is independently wired and led to the output end of the position detection unit.

9. The wireless charger according to claim 1, wherein: The position detection unit further includes a flexible circuit board, and the plurality of electrodes are disposed on the flexible circuit board.

10. A method for reminding a wireless charger of a location, performed by using the wireless charger according to any one of claims 1 to 9, the method comprising: Bringing the wireless charger close to the implantable medical device, obtaining actual capacitance values ​​between multiple electrodes in the position detection unit, and comparing the actual capacitance values ​​with corresponding reference capacitance values, wherein the reference capacitance values ​​are capacitance values ​​between multiple electrodes in the capacitance sensor when the wireless charger and the implantable medical device are aligned; According to the comparison result, it is determined whether the placement position of the wireless charger is abnormal, and in response to the placement position of the wireless charger being abnormal, a position abnormality reminder is issued to the user.

11. The location reminder method according to claim 10, wherein: One of the electrodes is an excitation electrode (7), and the remaining electrodes are receiving electrodes (8). Sub-capacitance sensors are formed between the excitation electrode (7) and the plurality of receiving electrodes (8).

12. The location reminder method according to claim 10, wherein: Placing the wireless charger close to the implantable medical device to obtain actual capacitance values ​​between a plurality of electrodes of the position detection unit includes: The wireless charger is placed close to the implantable medical device to obtain actual capacitance values ​​of the plurality of sub-capacitance sensors.

13. The location reminder method according to claim 11, further comprising: The wireless charger is placed at a reference charging position of the implantable medical device to obtain reference capacitance values ​​of the plurality of sub-capacitance sensors of the capacitance sensor.

14. The location reminder method according to claim 13, after placing the wireless charger at the reference charging position of the implantable medical device and obtaining the reference capacitance values ​​of the plurality of sub-capacitance sensors of the capacitance sensor, further comprising: The wireless charger is moved from a reference charging position by a preset distance in multiple directions, and a change trend of the capacitance value is obtained by measuring the change degree between the capacitance values ​​of the multiple sub-capacitance sensors and the reference capacitance value after the movement.

15. The location reminder method according to claim 11, wherein judging whether the placement position of the wireless charger is abnormal according to the comparison result comprises: According to the comparison result, the distance difference between the placement position of the wireless charger and the reference charging position is determined, and according to the distance difference, whether the placement position of the wireless charger is abnormal is determined, and direction guidance is given.

16. The location reminder method according to claim 10, wherein: The comparison of the actual capacitance value with the reference capacitance value is: the difference between the actual capacitance value and the reference capacitance value; Or, the ratio of the actual capacitance value to the reference capacitance value.

17. The location reminder method according to claim 15, wherein: The step of determining the distance difference between the placement position of the wireless charger and the reference charging position according to the comparison result includes: Establishing a correspondence between capacitance changes and distance changes of the plurality of sub-capacitance sensors through historical data; The difference between the actual capacitance value and the reference capacitance value is calculated, and according to the difference and the corresponding relationship between the capacitance change and the distance change, the distance difference of the wireless charger relative to the reference charging position is determined and recorded.

18. The location reminder method according to claim 17, wherein: The establishing of a correspondence between a capacitance change and a distance change of a plurality of sub-capacitance sensors through historical data includes: Acquire capacitance values ​​of a plurality of sub-capacitance sensors in the capacitive sensor when the wireless charger moves from the reference charging position to different preset directions and preset distances; Subtracting the capacitance values ​​of the plurality of sub-capacitance sensors after the movement from the corresponding reference capacitance values ​​respectively to obtain differences of the plurality of capacitance values; According to the multiple preset moving distances and the differences of the multiple capacitance values, a corresponding relationship between the capacitance change and the distance change of the multiple sub-capacitance sensors is established.

19. The location reminder method according to claim 17, wherein: The calculating the difference between the actual capacitance value and the reference capacitance value, and determining and recording the distance difference of the wireless charger relative to the reference charging position according to the difference and the corresponding relationship between the capacitance change and the distance change, includes: Calculating a difference between the actual capacitance value and the reference capacitance value; Obtaining distances of different sub-capacitance sensors relative to the reference charging position according to the difference and the corresponding relationship between the capacitance change and the distance change of the plurality of sub-capacitance sensors; Obtaining first position information of the wireless charger and recording first position coordinates according to the distances of a plurality of different sub-capacitance sensors relative to the reference charging position; The first position information is corrected by recording the capacitance value and its position in the historical record to obtain the final position information and record the final position information.

20. The location reminder method according to claim 19, wherein: The step of correcting the first position information to obtain final position information and recording the final position information by recording the capacitance value and the position thereof in the historical record includes: Obtain the capacitance values ​​of all position records recorded in the historical records; taking the capacitance value closest to the actual capacitance value among the capacitance values ​​recorded in the historical records as the correction capacitance, and determining the correction coordinates corresponding to the correction capacitance; The first position information is corrected according to the corrected coordinates to obtain final position information.

21. The location reminder method according to claim 20, wherein: The method of using the capacitance value closest to the actual capacitance value among the capacitance values ​​recorded in the historical records as a correction capacitance and determining the correction coordinates corresponding to the correction capacitance includes: Calculate the similarity between the capacitance value recorded at each position in the historical record and the actual capacitance value; In response to the highest similarity exceeding a preset threshold, the capacitance value corresponding to the highest similarity is used as a corrected capacitance value, and a corrected coordinate corresponding to the corrected capacitance value is determined. In response to the highest similarity not exceeding a preset threshold, the first position information is used as final position information.

22. The location reminder method according to claim 20 or 21, wherein: Correcting the first position information according to the corrected coordinates to obtain final position information includes: Determining a correction weight of the correction coordinate according to a distance between the correction capacitance and the actual capacitance value; Determining a correction formula for the first position information according to the correction weight; The corrected coordinates and the first position information are substituted into the correction formula to obtain the final position information.

23. An implantable medical system comprising: An implantable medical device, wherein the implantable medical device is configured to be implanted in a human body; A wireless charger as claimed in any one of claims 1 to 9.

24. A computer-readable storage medium storing a computer program, wherein the computer program implements the method according to any one of claims 10 to 22 when executed by at least one processor.

25. A computer program product comprising a computer program / instructions, wherein: When the computer program / instructions are executed by a processor, the method described in any one of claims 10 to 22 is implemented.

Images