Active implantable medical device and magnetic induction mechanism thereof

Abstract

The present invention provides an active implantable medical device and a magnetic induction mechanism thereof, the magnetic induction mechanism comprising a soft magnet and a uniaxial magnetic field sensor, the soft magnet generates an external magnetic field after being magnetized, the uniaxial magnetic field sensor is arranged within the coverage of the external magnetic field, and outputs a detection signal according to the field strength of the external magnetic field, and after receiving the detection signal, the control unit of the active implantable medical device outputs a control signal to control the working mode according to the detection signal. The present invention can realize accurate detection of the magnetic field by combining a soft magnet and a uniaxial magnetic field sensor, and the material cost, volume and design difficulty are also low, and the automatic adjustment of the working mode of the active implantable medical device is realized, the efficiency, safety and comfort of MRI detection of patients implanted with active implantable medical devices are improved, and medical resources are optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to an active implantable medical device and a magnetic induction mechanism thereof. Background Art

[0002] Active implantable medical device (AIMD) is an active medical device that is fully or partially introduced into the human body's organ tissue or natural cavity through surgery and is left in the human body after surgery. Studies have shown that 50%-75% of patients implanted with active implantable medical devices will have the need to perform magnetic resonance imaging (MRI).

[0003] Since a large number of magnetic elements may be used in active implantable medical devices, and the magnetic elements are very precise, in order to avoid the interference of the magnetic field and affect the normal operation of the active implantable medical device, before the patient with the active implantable medical device undergoes MRI detection, it is necessary to adjust the working mode of the active implantable medical device to a mode that can safely perform MRI detection (MRI mode), and after the detection, the active implantable medical device is adjusted back to the normal mode. The existing adjustment of the working mode of the active implantable medical device is usually manual adjustment, that is, before the patient undergoes MRI detection, the professional program controls the active implantable medical device to the MRI mode, and the active implantable medical device immediately enters the MRI mode. During the waiting period before the MRI detection and during the detection period, the active implantable medical device works in the MRI mode until the detection is completed, and the professional program controls the active implantable medical device to the normal mode. Although manual adjustment can realize the mode switching of the active implantable medical device, it requires the professional to be on standby at any time, and it is slow and inefficient. Summary of the invention

[0004] The object of the present invention is to provide an active implantable medical device and a magnetic induction mechanism thereof, by means of which the active implantable medical device can realize an automatic adjustment mode, thereby improving the efficiency of MRI detection.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a magnetic induction mechanism of an active implantable medical device, a soft magnet and a uniaxial magnetic field sensor, wherein the uniaxial magnetic field sensor is arranged within the coverage range of the external magnetic field generated after the soft magnet is magnetized, and the uniaxial magnetic field sensor outputs a detection signal according to the field strength of the external magnetic field.

[0006] Optionally, the soft magnetic body includes a magnetic field receiving end and a magnetic field concentrating end which are relatively arranged, the magnetic field receiving end is used to receive the surrounding magnetic field, and the magnetic field concentrating end is used to concentrate the magnetic flux on the corresponding magnetic circuit to form the external magnetic field, and the sensitive axis of the single-axis magnetic field sensor is parallel to the direction of the magnetic circuit.

[0007] Optionally, the magnetic field receiving end is in the shape of an arc that protrudes outward relative to the center of the soft magnetic body, and the magnetic field concentrating end is a pointed end that protrudes outward relative to the center of the soft magnetic body.

[0008] Optionally, the surface of the soft magnetic body is covered with a coating, and the material of the coating at least includes silicone resin and soft magnetic material.

[0009] The present invention also provides an active implantable medical device, comprising a soft magnet, a uniaxial magnetic field sensor and a control unit;

[0010] The uniaxial magnetic field sensor is arranged within the coverage range of the external magnetic field generated after the soft magnetic body is magnetized, and outputs a detection signal according to the field strength of the external magnetic field;

[0011] The control unit is used to receive the detection signal output by the uniaxial magnetic field sensor, and output a control signal according to the detection signal to control the active implantable medical device to work in a corresponding mode.

[0012] Optionally, the soft magnetic body includes a magnetic field receiving end and a magnetic field concentrating end which are arranged opposite to each other, the magnetic field receiving end is used to receive the surrounding magnetic field, and the magnetic field concentrating end is used to concentrate the magnetic flux on a magnetic circuit to form the external magnetic field, and the sensitive axis of the single-axis magnetic field sensor is parallel to the direction of the magnetic circuit.

[0013] Optionally, the magnetic field receiving end is in the shape of an arc that protrudes outward relative to the center of the soft magnetic body, and the magnetic field concentrating end is a pointed end that protrudes outward relative to the center of the soft magnetic body.

[0014] Optionally, the surface of the soft magnetic body is covered with a coating, and the material of the coating at least includes silicone resin and soft magnetic material.

[0015] Optionally, the control signal includes a first control signal and a second control signal, the working mode of the active implantable medical device includes a detection mode and a normal mode, and the active implantable medical device further includes:

[0016] A mode adjustment unit, wherein the mode adjustment unit adjusts the active implantable medical device to a detection mode when receiving the first control signal, and adjusts the active implantable medical device to a normal mode when receiving the second control signal.

[0017] Optionally, the uniaxial magnetic field sensor outputs a first detection signal when the field strength of the external magnetic field is greater than a set value, and the control unit outputs the first control signal based on the first detection signal; the uniaxial magnetic field sensor outputs a second detection signal when the field strength of the external magnetic field is less than or equal to the set value, and the control unit outputs the second control signal based on the second detection signal.

[0018] In the active implantable medical device and its magnetic induction mechanism provided by the present invention, the magnetic induction mechanism includes a soft magnet and a uniaxial magnetic field sensor, the soft magnet generates an external magnetic field after being magnetized, the uniaxial magnetic field sensor is arranged within the coverage of the external magnetic field, and outputs a detection signal according to the field strength of the external magnetic field, and the control unit of the active implantable medical device receives the detection signal and outputs a control signal to control the working mode according to the detection signal. The present invention can realize accurate detection of the magnetic field by combining a soft magnet and a uniaxial magnetic field sensor, realizes automatic adjustment of the working mode of the active implantable medical device, and the material cost, volume and design difficulty are not high, improves the efficiency, safety and comfort of MRI detection for patients implanted with active implantable medical devices, and optimizes medical resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an MRI device;

[0020] Figure 2 for Figure 1 A field strength distribution diagram of the magnetic field in the detection cavity of the MRI device;

[0021] Figure 3 A schematic diagram showing a direction in which the sensitive axis of a single-axis magnetic field sensor provided by an embodiment of the present invention is parallel to the static magnetic field;

[0022] Figure 4 A schematic diagram showing that a sensitive axis of a single-axis magnetic field sensor provided by an embodiment of the present invention forms an acute angle with the direction of a static magnetic field;

[0023] Figure 5 A schematic diagram showing a direction in which the sensitive axis of the single-axis magnetic field sensor provided by an embodiment of the present invention is perpendicular to the static magnetic field;

[0024] Figure 6 A signal transmission diagram of an active implantable medical device provided by an embodiment of the present invention;

[0025] Wherein, the accompanying drawings are marked as follows:

[0026] 10-detection cavity; 11-patient bed; 20-single-axis magnetic field sensor; 21-soft magnet; 211-magnetic field receiving end, 212-magnetic field concentrating end; 30-control unit; 40-mode adjustment unit. DETAILED DESCRIPTION

[0027] MRI is usually done in Figure 1 The MRI device shown in the figure is performed, the patient lies on the bed 11, and the bed moves along the Z direction to enter the detection cavity 10 to perform magnetic resonance imaging. The magnetic field generated by the MRI device includes a static magnetic field, a gradient field, and a radio frequency field, wherein the gradient field and the radio frequency field need to be manually turned on after the patient enters the detection cavity 10 for a period of time, while the static magnetic field is always present and distributed along the Z direction.

[0028] Figure 2 is the field intensity distribution diagram of the static magnetic field in the detection cavity 10, from Figure 2 It can be seen that the static magnetic field in the detection cavity 10 has a very high field strength uniformity within a certain range in the center of the detection cavity 10, and the field strength is extremely large, which can reach 3 T. A static magnetic field also exists in a certain area (such as area Q) far away from the center of the detection cavity 10. Although the field strength of the static magnetic field in area Q will be greatly attenuated, it is usually greater than 100 mT, which is much greater than the field strength of the magnetic field that the patient can be exposed to in the natural environment.

[0029] There is a method for automatically adjusting the working mode of an active implantable medical device: by integrating a magnetic field sensor in the active implantable medical device, the magnetic field sensor can detect the magnetic field of the patient's environment in real time. When the patient approaches the MRI device and lies on the bed, the magnetic field sensor can detect the presence of a static magnetic field, and the working mode of the active implantable medical device automatically switches to the MRI mode; when the detection is completed, the patient leaves the vicinity of the bed, the magnetic field sensor can detect that the static magnetic field disappears, and the working mode of the active implantable medical device automatically switches to the normal mode. The realization of automatically adjusting the working mode of the active implantable medical device can save medical resources, and more importantly, provide physiological pacing for patients and improve patient comfort.

[0030] Existing magnetic field sensors include single-axis magnetic field sensors, dual-axis magnetic field sensors or three-axis magnetic field sensors. Dual-axis magnetic field sensors and three-axis magnetic field sensing devices are actually obtained by integrating two or three single-axis magnetic field sensors. Therefore, dual-axis magnetic field sensors or three-axis magnetic field sensors are expensive and difficult to design.

[0031] The magnetic field sensor can be implemented by using a single dual-axis magnetic field sensor, a single three-axis magnetic field sensor, or two single-axis magnetic field sensors arranged perpendicularly to each other, which can fully and accurately detect the static magnetic field, but the cost is also higher.

[0032] If the magnetic field sensor is implemented using only a single-axis magnetic field sensor, since the single-axis magnetic field sensor can only detect the magnetic field when the direction of the magnetic field is parallel to its sensitive axis or has a component on its sensitive axis, it cannot detect the magnetic field when the direction of the magnetic field is perpendicular to its sensitive axis. When a patient with an active implantable medical device suffers from rotation syndrome (the patient plays with the active implantable medical device, causing the orientation of the active implantable medical device to deviate from the initial implantation position), when the sensitive axis of the single-axis magnetic field sensor is perpendicular to the direction of the static magnetic field, a single-axis magnetic field sensor cannot detect the static magnetic field. Therefore, it is difficult for a single-axis sensor to fully and accurately detect the existence of a static magnetic field.

[0033] Based on this, the present invention provides an active implantable medical device and a magnetic induction mechanism thereof, the magnetic induction mechanism comprising a soft magnet and a uniaxial magnetic field sensor, the soft magnet generates an external magnetic field after being magnetized, the uniaxial magnetic field sensor is located within the coverage of the external magnetic field, and outputs a detection signal according to the field strength of the external magnetic field, and after receiving the detection signal, the control unit of the active implantable medical device outputs a control signal according to the detection signal to control the working mode. The present invention can realize accurate detection of the magnetic field, realize automatic adjustment of the working mode of the active implantable medical device, improve the efficiency, safety and comfort of MRI detection for patients implanted with the active implantable medical device, and optimize medical resources. In traditional active implantable medical devices, either no magnetic field detection element is used, or a combination of two uniaxial magnetic field sensors or a three-axis magnetic field sensor is used to detect the magnetic field; the former active implantable medical device does not have the compatibility function of magnetic resonance imaging equipment, that is, it is more dangerous to use in a magnetic field environment; the latter, even if the active implantable medical device has the compatibility function of being used in a magnetic field environment, the cost of the uniaxial magnetic field sensor or the three-axis magnetic field sensor is very high, so the price of the active implantable medical device is also very high. The present invention uses a combination of a soft magnetic body and a uniaxial magnetic field sensor, that is, only one uniaxial magnetic field sensor is used, so the present application can significantly reduce material cost and volume compared to the traditional method, and reduce the cost of active implantable medical devices. In addition, the sensitive axis direction of the soft magnetic body in the present invention does not need to be parallel to the magnetic field direction of the static magnetic field, and can detect magnetic fields in various directions, and the design difficulty is also relatively low.

[0034] The specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0035] like Figure 3 and Figure 6As shown, this embodiment provides an active implantable medical device and a magnetic induction mechanism thereof, wherein the magnetic induction mechanism of the active implantable medical device includes a soft magnet 21 and a single-axis magnetic field sensor 20, and the active implantable medical device includes the magnetic induction mechanism of the active implantable medical device and a control unit 30.

[0036] It can be understood that soft magnets are relative to hard magnets. The remanence B of hard magnets is r and coercivity H c are relatively large, and the remanence B of soft magnets r and coercivity H c Both are relatively small (approaching 0), so a hard magnet can retain a large magnetism after being magnetized by a magnetic field, while a soft magnet will demagnetize immediately after exiting the magnetic field after being magnetized by the magnetic field. In other words, when a soft magnet is in a magnetic field, it will be magnetized and generate an external magnetic field, and after exiting the magnetic field, the external magnetic field will disappear immediately. In addition, a soft magnet is a good conductor of magnetic fields and can gather magnetic fields. When a soft magnet is placed in a magnetic field, it can distort the magnetic field in which it is located. The magnetic field at one end that receives the magnetic field becomes sparse, while the magnetic field at one end that emits the external magnetic field becomes dense (equivalent to gathering the magnetic field). The strength of the external magnetic field generated by a soft magnet varies with the strength of the magnetic field in which it is located. Specifically, when the strength of the magnetic field in which the soft magnet is located is larger, the strength of the external magnetic field generated by the soft magnet is also larger. When the strength of the magnetic field in which the soft magnet is located is smaller, the strength of the external magnetic field generated by the soft magnet is also smaller. Moreover, since the magnetic field will produce losses inside the soft magnet, the strength of the external magnetic field generated by the soft magnet is usually smaller than the strength of the magnetic field in which it is located.

[0037] In this embodiment, the material of the soft magnetic body 21 can be soft iron, iron-silicon alloy, iron-aluminum alloy, iron-silicon-aluminum alloy, nickel-iron alloy, iron-cobalt alloy, amorphous soft magnetic alloy or ultra-fine crystal soft magnetic alloy. The surface of the soft magnetic body 21 is covered with a coating, and the material of the coating at least includes silicone resin and soft magnetic material. The silicone resin can enhance the density, magnetic permeability and magnetic flux of the soft magnetic material and reduce the loss of the soft magnetic material. Therefore, the coating made of soft magnetic material and silicone resin has the characteristics of high density, high magnetic permeability, high magnetic flux density, low loss and high fracture strength, which can increase the reliability and life of the soft magnetic body 21. In addition, the coating will not change the magnetic field characteristics of the soft magnetic body 21 after being magnetized, and can also protect the soft magnetic body 21 and prevent the soft magnetic body 21 from being damaged. As an optional embodiment, the coating can also be other materials with high density, high magnetic permeability, high magnetic flux density, low loss and high fracture strength, which are not limited in this embodiment.

[0038] Based on this, Figure 3As shown, the soft magnetic body 21 includes a magnetic field receiving end 211 and a magnetic field concentrating end 212 which are arranged opposite to each other. When the active implantable medical device is located under a static magnetic field E1, the soft magnetic body 21 is magnetized. Specifically, the magnetic field receiving end of the soft magnetic body 21 receives the static magnetic field E1, and the magnetic field concentrating end 212 generates an external magnetic field E2 and concentrates the magnetic flux on the corresponding magnetic path (or even on one magnetic path) to form an external magnetic field E2, so the external magnetic field E2 is denser than the static magnetic field E1. The single-axis magnetic field sensor 20 is located within the coverage range of the external magnetic field E2 and the sensitive axis is parallel to the direction of the magnetic path, so that the single-axis magnetic field sensor 20 can detect the existence of the external magnetic field E2 in real time and output a detection signal according to the field strength of the detected magnetic field.

[0039] Further, the magnetic field receiving end 211 is in an arc shape protruding outward relative to the center of the soft magnet 21, so that the magnetic field receiving end 211 can receive the static magnetic field E1 in all directions, and the magnetic field concentration end 212 is a tip protruding outward relative to the center of the soft magnet 21, so that the external magnetic field E2 is more dense and easier to be detected by the single-axis magnetic field sensor 20. In the present invention, the magnetic field receiving end 211 is not limited to being an arc shape, and the magnetic field concentration end 212 is not limited to being a tip shape. For example, the magnetic field concentration end 212 can also be an arc shape protruding outward relative to the center of the soft magnet 21, or an end that is blunter than the tip. In this way, the external magnetic field E2 may not be concentrated enough, and the magnetic flux of the external magnetic field E2 cannot be concentrated on one magnetic path, but is concentrated on multiple magnetic paths. At this time, it may be necessary to increase the detection accuracy of the single-axis magnetic field sensor 20 to ensure that the single-axis magnetic field sensor 20 can detect the external magnetic field E2 with a smaller magnetic field intensity. Therefore, the shape of the soft magnetic body 21 can be specifically designed according to the detection accuracy of the single-axis magnetic field sensor 20, and the present invention will not give examples one by one.

[0040] The static magnetic field E1 is as follows Figure 1 The static magnetic field in the MRI device shown is that when a patient implanted with the active implantable medical device enters area Q, the single-axis magnetic field sensor 20 will detect the magnetic field in real time during the period of waiting for detection.

[0041] When the active implantable medical device is in a Figure 3In the orientation shown, the sensitive axis of the uniaxial magnetic field sensor 20 is in a direction parallel to ab or cd, and at this time, the sensitive axis of the uniaxial magnetic field sensor 20 is parallel to the static magnetic field E1, and the uniaxial magnetic field sensor 20 can detect the static magnetic field E1. At the same time, since the soft magnetic body 21 is also in the static magnetic field E1, the magnetic field concentration end 212 of the soft magnetic body 21 will generate the external magnetic field E2, and the uniaxial magnetic field sensor 20 can also detect the external magnetic field E2.

[0042] When the active implantable medical device is in a Figure 4 In the orientation shown, the sensitive axis of the uniaxial magnetic field sensor 20 is in a direction parallel to ab or cd. At this time, the sensitive axis of the uniaxial magnetic field sensor 20 has an acute angle with the direction of the static magnetic field E1. The static magnetic field E1 has a projection component in the direction of the sensitive axis of the uniaxial magnetic field sensor 20. The uniaxial magnetic field sensor 20 can also detect the static magnetic field E1, but the detection effect is not good. At the same time, since the soft magnetic body 21 is also in the static magnetic field E1, the magnetic field concentration end 212 of the soft magnetic body 21 will generate the external magnetic field E2, and the uniaxial magnetic field sensor 20 can also detect the external magnetic field E2. That is to say, when the sensitive axis of the uniaxial magnetic field sensor 20 is parallel to the direction of the static magnetic field E1 or has an acute angle with the direction of the static magnetic field E1, the uniaxial magnetic field sensor 20 can detect the static magnetic field E1 and the external magnetic field at the same time.

[0043] When the active implantable medical device is in a Figure 5 In the orientation shown, the sensitive axis of the uniaxial magnetic field sensor 20 is in a direction parallel to ab or cd, and the sensitive axis of the uniaxial magnetic field sensor 20 is perpendicular to the direction of the static magnetic field E1. At this time, since the static magnetic field E1 does not have a projection component in the direction of the sensitive axis of the uniaxial magnetic field sensor 20, the uniaxial magnetic field sensor 20 cannot detect the static magnetic field E1. However, since the soft magnetic body 21 is also in the static magnetic field E1, the magnetic field concentration end 212 of the soft magnetic body 21 will generate the external magnetic field E2, and the uniaxial magnetic field sensor 20 can detect the external magnetic field E2.

[0044] It can be seen that when the active implantable medical device is in any orientation in the static magnetic field E1, the single-axis magnetic field sensor 20 can at least detect the external magnetic field E2; or it can also be understood that, in any orientation, the soft magnetic body 21 can "transfer" the static magnetic field E1 to the direction of the sensitive axis of the single-axis magnetic field sensor 20, so that the single-axis magnetic field sensor 20 can detect the existence of the static magnetic field E1.

[0045] Since there is also a magnetic field in the natural environment (ignoring the geomagnetic field), the single-axis magnetic field sensor 20 of the active implantable medical device can detect the existence of the magnetic field in any magnetic field environment. However, the magnetic field in the natural environment is much smaller than the field strength of the static magnetic field E1, which is basically below 10mT. Therefore, in this embodiment, Figure 6 As shown, a control unit 30 is connected to the output end of the single-axis magnetic field sensor 20 to receive the detection signal sent by the single-axis magnetic field sensor 20. For details, please refer to Figure 6 , the control unit 30 is, for example, a voltage detection circuit, which is connected to the output end of the uniaxial magnetic field sensor 20, and the detection signal emitted by the uniaxial magnetic field sensor 20 is the voltage output by the output end. In the natural state, the voltage output by the output end of the uniaxial magnetic field sensor 20 is 0. When the active implantable medical device contacts the magnetic field in the natural environment, the output end of the uniaxial magnetic field sensor 20 will also output a voltage signal, but due to the small field strength of the magnetic field, the output voltage signal is small; when the active implantable medical device is in the static magnetic field E1, since the field strength of the static magnetic field E1 is greater than or equal to 100mT, the field strength of the external magnetic field E2 generated by the soft magnetic body 21 is at least greater than 40mT, and the voltage signal output by the output end of the uniaxial magnetic field sensor 20 is very large. After processing the voltage signal, the control unit 40 can output a control signal according to the different voltage signals to control the active implantable medical device to work in the corresponding mode.

[0046] It should be understood that the control unit 30 referred to in the present invention is not limited to any existing voltage detection circuit, but can also be a signal conditioning circuit, or a combination of a voltage detection circuit, an amplification circuit and a digital-to-analog conversion circuit, as long as it can detect the detection signal output by the single-axis magnetic field sensor 20 and output different control signals according to different detection signals.

[0047] In this embodiment, the working mode of the active implantable medical device includes a detection mode and a normal mode, wherein the detection mode is a mode in which the active implantable medical device can safely work in the MRI device, and the normal mode is a working mode in which the active implantable medical device provides normal physiological functions for the patient in a natural environment. For example, when the active implantable medical device is a cardiac pacemaker, the normal mode is a working mode in which the active implantable medical device provides normal physiological pacing functions for the patient.

[0048] The control signal output by the control unit 30 includes a first control signal and a second control signal. The active implantable medical device further includes a mode adjustment unit 40. When a patient implanted with the active implantable medical device needs to undergo an MRI test, the single-axis magnetic field sensor 20 can detect the presence of a strong magnetic field (static magnetic field E1 and / or external magnetic field E2) near the MRI device. The single-axis magnetic field sensor 20 outputs a first detection signal, and the voltage of the first detection signal is large enough. At this time, the control unit 30 outputs a first control signal. Upon receiving the first control signal, the mode adjustment unit 40 adjusts the active implantable medical device to a detection mode, and can perform an MRI test. When the patient implanted with the active implantable medical device leaves the MRI device after completing the MRI test, the single-axis magnetic field sensor 20 cannot detect the presence of a magnetic field. The single-axis magnetic field sensor 20 outputs a second detection signal, and the voltage of the second detection signal is very small (close to 0). At this time, the control unit 30 outputs a second control signal. Upon receiving the second control signal, the mode adjustment unit 40 adjusts the active implantable medical device to a normal mode, thereby achieving automatic adjustment of the working mode of the active implantable medical device.

[0049] In summary, in the active implantable medical device and its magnetic induction mechanism provided by the embodiment of the present invention, the magnetic induction mechanism includes a soft magnet and a uniaxial magnetic field sensor, the soft magnet will generate an external magnetic field after being magnetized, the uniaxial magnetic field sensor is located within the coverage of the external magnetic field, and outputs a detection signal according to the field strength of the external magnetic field, and the control unit of the active implantable medical device receives the detection signal and outputs a control signal according to the detection signal to control the working mode. The present invention can realize accurate detection of the magnetic field, realize automatic adjustment of the working mode of the active implantable medical device, improve the efficiency, safety and comfort of MRI detection for patients implanted with active implantable medical devices, and optimize medical resources. Compared with the use of a combination of two uniaxial magnetic field sensors or a three-axis magnetic field sensor to detect the magnetic field, the present invention uses a combination of a soft magnet and a uniaxial magnetic field sensor to greatly reduce material cost and volume; and the sensitive axis direction of the soft magnet in the present invention does not need to be parallel to the magnetic field direction of the static magnetic field, and can also detect magnetic fields in all directions, and the design difficulty is also relatively low.

[0050] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A magnetic induction mechanism for an active implantable medical device, characterized in that: include: A soft magnetic body and a uniaxial magnetic field sensor, wherein the uniaxial magnetic field sensor is arranged within the coverage range of the external magnetic field generated after the soft magnetic body is magnetized, and the uniaxial magnetic field sensor outputs a detection signal according to the field strength of the external magnetic field; The soft magnetic body comprises a magnetic field receiving end and a magnetic field concentrating end which are arranged opposite to each other, the magnetic field receiving end is used to receive the surrounding magnetic field, the magnetic field concentrating end is used to concentrate the magnetic flux on the corresponding magnetic path to form the external magnetic field, and the sensitive axis of the single-axis magnetic field sensor is parallel to the direction of the magnetic path; The active implantable medical device includes a cardiac pacemaker.

2. The magnetic induction mechanism of an active implantable medical device according to claim 1, characterized in that: The magnetic field receiving end is in the shape of an arc that protrudes outward relative to the center of the soft magnetic body, and the magnetic field concentrating end is a pointed end that protrudes outward relative to the center of the soft magnetic body.

3. The magnetic induction mechanism of an active implantable medical device according to claim 1 or 2, characterized in that: The surface of the soft magnetic body is covered with a coating, and the material of the coating at least includes silicone resin and soft magnetic material.

4. An active implantable medical device, characterized in that: It includes a soft magnet, a single-axis magnetic field sensor and a control unit; The uniaxial magnetic field sensor is arranged within the coverage range of the external magnetic field generated after the soft magnetic body is magnetized, and outputs a detection signal according to the field strength of the external magnetic field; The control unit is used to receive the detection signal output by the uniaxial magnetic field sensor, and output a control signal according to the detection signal to control the active implantable medical device to work in a corresponding mode; The soft magnetic body comprises a magnetic field receiving end and a magnetic field concentrating end which are arranged opposite to each other, the magnetic field receiving end is used to receive the surrounding magnetic field, the magnetic field concentrating end is used to concentrate the magnetic flux on a magnetic path to form the external magnetic field, and the sensitive axis of the single-axis magnetic field sensor is parallel to the direction of the magnetic path; The active implantable medical device includes a cardiac pacemaker.

5. The active implantable medical device according to claim 4, characterized in that: The magnetic field receiving end is in the shape of an arc that protrudes outward relative to the center of the soft magnetic body, and the magnetic field concentrating end is a pointed end that protrudes outward relative to the center of the soft magnetic body.

6. The magnetic induction mechanism of an active implantable medical device according to claim 4 or 5, characterized in that: The surface of the soft magnetic body is covered with a coating, and the material of the coating at least includes silicone resin and soft magnetic material.

7. The active implantable medical device according to claim 4, characterized in that: The control signal includes a first control signal and a second control signal, the working mode of the active implantable medical device includes a detection mode and a normal mode, and the active implantable medical device further includes: A mode adjustment unit, wherein the mode adjustment unit adjusts the active implantable medical device to a detection mode when receiving the first control signal, and adjusts the active implantable medical device to a normal mode when receiving the second control signal.

8. The active implantable medical device according to claim 7, characterized in that: The uniaxial magnetic field sensor outputs a first detection signal when the field strength of the external magnetic field is greater than a set value, and the control unit outputs the first control signal according to the first detection signal; the uniaxial magnetic field sensor outputs a second detection signal when the field strength of the external magnetic field is less than or equal to the set value, and the control unit outputs the second control signal according to the second detection signal.

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