CN113644405B - Implantable medical equipment - Google Patents
Implantable medical equipment Download PDFInfo
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- CN113644405B CN113644405B CN202110913250.4A CN202110913250A CN113644405B CN 113644405 B CN113644405 B CN 113644405B CN 202110913250 A CN202110913250 A CN 202110913250A CN 113644405 B CN113644405 B CN 113644405B
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- 229910052751 metal Inorganic materials 0.000 claims description 153
- 239000002184 metal Substances 0.000 claims description 153
- 239000000523 sample Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 11
- 230000005855 radiation Effects 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 7
- 230000000747 cardiac effect Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 238000002513 implantation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000006386 memory function Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 210000002837 heart atrium Anatomy 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002107 myocardial effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 210000002620 vena cava superior Anatomy 0.000 description 1
- 208000003663 ventricular fibrillation Diseases 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Electrotherapy Devices (AREA)
Abstract
The invention proposes an implantable medical device comprising: a housing assembly; a head assembly disposed on the housing assembly; a main body circuit board disposed within the housing assembly; the capacitance adjusting circuit is arranged on the main circuit board and comprises a varactor and a direct current bias circuit; the antenna is arranged in the head assembly, the first end of the antenna is connected with the capacitance adjusting circuit, the second end of the antenna is connected with the matching network circuit to form a circular current path, and the capacitance adjusting circuit is used for adjusting the working frequency of the antenna. The implantable medical device provided by the invention can dynamically adjust the working frequency of the antenna, can be used for correcting the working frequency of the antenna, and can also be used for adjusting the frequency to meet different working modes or applications.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to implantable medical equipment.
Background
At present, as the population fertility rate is continuously reduced, the problem of population aging is continuously aggravated, and the problem is commonly faced by countries around the world. The aging population is increasing, and there is a great market demand for high quality healthcare services. Based on this application background, wireless implantable medical systems have been proposed and are continually evolving and being used, particularly implantable cardiac pacemakers/defibrillators and the like. The wireless implantable medical system can monitor, prevent and treat the physical condition of the patient in real time, and greatly ensures the life safety and happy life of the patient.
The antenna is used as a bridge for wireless communication between the wireless implantable medical device and external program control equipment, is an indispensable component of a wireless implantable medical system, and the performance of the antenna can directly determine whether the implantable medical device can normally and controllably work. During in-vivo operation of an implantable medical device, the operating frequency of the antenna may shift according to different implantation environments, so that the antenna is difficult to operate normally under different implantation environments. Meanwhile, when the implantable medical device works in a human tissue environment for a long time, the implantable medical device can have the problems of liquid leakage, liquid permeation and the like, which means that the environment around the antenna is not originally wrapped by materials, the equivalent dielectric constant of the environment can also be increased, the working frequency of the antenna can be shifted to a low frequency, thus the working performance of the antenna is reduced, and a communication link between the implantable medical device and external control equipment can be arranged in the middle when the working performance of the antenna is serious.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention proposes an implantable medical device, which can timely adjust the working frequency of an antenna by adjusting an access adjustable capacitance value when the working frequency of the antenna is shifted according to the environmental changes around the antenna, so as to keep the antenna working normally under different environments.
To achieve the above and other objects, the present invention provides an implantable medical device comprising:
a housing assembly;
a head assembly disposed on the housing assembly;
a main body circuit board disposed within the housing assembly;
the capacitance adjusting circuit is arranged on the main circuit board and comprises a varactor and a direct current bias circuit;
the antenna is arranged in the head assembly, the first end of the antenna is connected with the capacitance adjusting circuit, the second end of the antenna is connected with the matching network circuit to form a circular current path, and the capacitance adjusting circuit is used for adjusting the working frequency of the antenna.
Further, the antenna includes a first metal sheet, a second metal sheet, a third metal sheet, and a fourth metal sheet.
Further, the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are connected in sequence.
Further, the main circuit board is connected with the flexible circuit board through the matching network, and the flexible circuit board is connected with the low-voltage circuit board.
Further, the first metal sheet is connected to the low-voltage circuit board through a feed structure.
Further, the first metal sheet is perpendicular to the second metal sheet, the second metal sheet is perpendicular to the third metal sheet, and the third metal sheet is perpendicular to the fourth metal sheet.
Further, the second metal sheet and the third metal sheet form the bent portion.
Further, the fourth metal sheet is connected with the capacitance adjusting circuit through a metal probe.
Further, the fourth metal sheet and the capacitance adjusting circuit are located at two sides of the main circuit board.
Further, the length of the third metal sheet is greater than the length of the second metal sheet.
Further, the antenna comprises at least one bending part.
Further, the second metal sheet and the third metal sheet are coplanar and are connected perpendicular to each other, the first metal sheet and the fourth metal sheet are perpendicular to the planes of the second metal sheet and the third metal sheet, respectively, and the first metal sheet and the fourth metal sheet are located on the same side of the planes of the second metal sheet and the third metal sheet.
In summary, the present invention provides an implantable medical device, which includes a housing assembly and a head assembly, wherein a main circuit board is disposed in the housing assembly, and a capacitance adjusting circuit is disposed on the main circuit board. An antenna is arranged in the head component, one end of the antenna is connected with the capacitance adjusting circuit, and the capacitance adjusting circuit comprises a varactor. When the environment around the antenna changes, the capacitance adjusting circuit can change the capacitance value of the serial antenna by changing the direct current bias circuit, so that the working frequency of the antenna is adjusted, and therefore, the working frequency of the antenna can meet the working requirements of different implantation environments and also can meet the working requirements under different frequency band modes.
Drawings
Fig. 1: the invention relates to an external structure of an implanted medical device and a schematic diagram of the relative positions of all parts of components in a human body when the external structure is implanted in the human body.
Fig. 2: the present invention is a structural diagram of an implanted medical device.
Fig. 3: the antenna and housing assembly of the present invention is shown in schematic position.
Fig. 4: the invention relates to a connection diagram of an antenna and a main circuit board.
Fig. 5: structure of antenna in the present invention.
Fig. 6: another block diagram of the antenna of the present invention.
Fig. 7: the PI type circuit is shown in the schematic diagram.
Fig. 8: the response diagram of the operating bandwidth of the antenna of the present invention.
Fig. 9: another block diagram of an implantable medical device in accordance with the present invention.
Fig. 10: another connection diagram of the antenna and the main body circuit board in the present invention.
Fig. 11: another block diagram of the antenna of the present invention.
Fig. 12: the invention discloses a schematic diagram of a capacitance adjusting circuit.
Fig. 13: another response plot of the operating bandwidth of the antenna of the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an external appearance structure of an implanted medical device and a relative position of each part of components in a human body when the implanted medical device is implanted in the human body. Taking ICD100 as an example, the specific operation of an implantable medical device when implanted in the heart 114 region of a person 200 is described. ICD100 is comprised of a housing assembly 101, a header assembly 102, and a lead 109. The ICD100 has mounted therein a body circuit board, a power supply, a capacitor, a transformer, a feedthrough assembly, a feedthrough buffer assembly, and an antenna. The implantable medical device has four functions 120: processor function 122, memory function 124, telemetry function 126, and interface function 128. Typically, the ICD is also capable of performing a user display function by interfacing with an external programmer or remote follower. The processor function 122 refers to the ICD being able to autonomously perceive cardiac electrical signals or physiological parameters of the human body 200 through the electrodes, autonomously completing the diagnosis, and issuing therapeutic commands. If an ICM, the processor function means that it can diagnose based on the electrocardiosignal parameters, excluding the treatment command. The memory function 124 refers to a function of the ICD that stores the electrocardiographic signals for a period of time and is capable of searching or reading electrocardiographic signal parameters recorded at that period of time at a later time. The feedthrough assembly of the implantable medical device is internally packaged with an antenna feedthrough and a lead feedthrough. The ICD feed-through assembly is provided with a high-voltage part and a low-voltage part, and the high-voltage part is connected with a high-voltage electrode of a lead; the low-voltage part is divided into a sensing part and an antenna part, the sensing part is connected with the lead sensing electrode, and the antenna part is connected with the antenna. The ICD function can be realized in two ways, and the ICD machine body can be regulated and controlled autonomously without manual triggering and control. Another is to communicate with and control the ICD by an external programming device, typically a programmer, patient assistant, or other device capable of giving instructions to or sensing internal signals. The communication mode between the ICD and the external program control equipment can be one or more of wireless communication networks such as wired communication, bluetooth, WIFI, LTE or CDMA. While ICDs need to have interface functionality 128, ICDs need to implement far-field telemetry monitoring and control over, for example, a Bluetooth interface, a wireless interface, or a wired interface, implantable medical devices have at least one of these interface functions. The wire 109 shown in fig. 1 is a single wire, and may be a double wire, a triple wire, or a quad wire during clinical use. Lead 109 is formed of defibrillation coil 111, pacing sensing electrode loop end 112, and pacing sensing tip 113. Lead 109 is connected to ICD device body 116 through header assembly 102. The lead 109 passes through the superior vena cava 132 and the atrium 130 of the human body 200 and can be implanted inside the ventricle 110. The coil 111 is capable of delivering defibrillation therapy to a diagnosed ventricular fibrillation event by delivering a pulse. In the treatment, the device main body case 118 itself serves as one electrode, and a voltage difference is formed between the electrode and the coil 111, so that the ventricle is electrically stimulated to achieve the treatment purpose. The pacing sensing electrode annulus 112 is capable of sensing cardiac electrical signals and physiological parameters within the heart 114. The pacing sensing head end 113 is a spiral fixed head, and the pacing sensing head end 113 rotates in the lead before use, and when implanted in the heart of a human body, the pacing sensing head end 113 rotates out of the lead from one end of the lead and is connected and fixed with myocardial tissues in the heart. The electrode wire needs to be coated by materials such as insulating materials, silica gel, polyurethane or epoxy resin.
As shown in fig. 2, the present embodiment proposes an implantable medical device 100, and the implantable medical device 100 is, for example, a cardiac pacemaker or a defibrillator, and the present embodiment is described by taking the implantable medical device 100 as an example of a cardiac defibrillator. The implantable medical device 100 may include a housing assembly 101 and a head assembly 102, the head assembly 102 being disposed on the housing assembly 101. The material of the load bearing member of the housing assembly 101 is biocompatible metallic titanium, such as titanium or a titanium alloy or stainless steel, and the material of the load bearing member of the head assembly 102 is injection molded, such as biocompatible high molecular weight polymer. The head assembly 102 is embedded with a metal connector which needs to be connected with a circuit of the titanium shell part through a metal needle of the feed-through assembly, and meanwhile, the metal connector can be conducted with an electrode lead, so that the target position treatment of a patient is realized.
As shown in fig. 2-5, in the present embodiment, an antenna 103 is provided within the head assembly 102, the antenna 103 also being located outside of the housing assembly 101. A main body circuit board 104 is provided inside the housing assembly 101. An antenna 103 may be connected to the main body circuit board 104. A flexible circuit board 107 is provided on the main body circuit board 104, and a low-voltage circuit board 106 is provided on the flexible circuit board 107, that is, both ends of the flexible circuit board 107 are connected to the main body circuit board 104 and the low-voltage circuit board 106, respectively. A through hole may be provided in the low-voltage circuit board 106, and then the feedthrough 105 may be provided in the through hole, so that connection of the low-voltage circuit board 106 to the antenna 103 may be achieved. In this embodiment, the feed structure 105 may feed an RF signal (alternating current signal) into the antenna 103 to resonate, thereby generating radiation. In the present embodiment, the flexible circuit on the flexible circuit board 107 is connected to the main body circuit on the main body circuit board 104.
As shown in fig. 4 to 5, in the present embodiment, the antenna 103 may be a metal sheet, and the antenna 103 may be a common metal, so that cutting processing is easy. The antenna 103 may comprise a first metal sheet 1031 and a second metal sheet 1032, which may also be a graded metal sheet or flexible metal PCB structure. The antenna 103 may include a first metal sheet 1031 and a second metal sheet 1032. The first and second metal sheets 1031 and 1032 may be connected at an inclination, i.e., the first and second metal sheets 1031 and 1032 are not in the same plane, and the connection angle of the first and second metal sheets 1031 and 1032 may be greater than 90 °, for example, 120 ° or 150 °. The first metal sheet 1031 may have a width smaller than that of the second metal sheet 1032. One end of the first metal sheet 1031 is connected to the second metal sheet 1032, the other end of the first metal sheet 1031 is connected to the feeding structure 105, and the first metal sheet 1031 is connected to the feeding structure 105, for example, through a metal probe, so as to connect the antenna 103 and the main circuit board 104. The first metal sheet 1031 and the second metal sheet 1032 serve as a radiation structure of the antenna 103, and the first metal sheet 1031 and the second metal sheet 1032 form a bandwidth gradation structure such as a butterfly structure or a planar cone structure as shown in fig. 5. The second metal sheet 1032 can realize a broadband response of the antenna 103, and can meet communication requirements in different environments and dynamically variable environments.
As shown in fig. 5 to 6, in the present embodiment, the width of the second metal sheet 1032 is greater than the width of the first metal sheet 1031, and the first metal sheet 1031 may be located at one end of the second metal sheet 1032. Near the connection position between the first metal sheet 1031 and the second metal sheet 1032, the width of the first metal sheet 1031 gradually widens until the first metal sheet 1031 is connected with the second metal sheet 1032, so as to form a butterfly broadband gradual change structure, thereby enabling the working frequency of the antenna to smoothly cover from 2.2GHz to 2.8GHz, enabling the working frequency band of the antenna 103 to be wider, and being suitable for application requirements in different communication environments and dynamically variable environments. The connection between the first metal sheet 1031 and the second metal sheet 1032 may be a chamfer connection, or may be a direct metal mechanical bending or a single metal commonality.
As shown in fig. 4 and 7, in the present embodiment, the flexible circuit board 107 may be connected to the main body circuit board 104 through a matching network. The matching network may be used to adjust the port impedance of the antenna 103, so that the port of the antenna 103 is well matched, and the radiation performance of the antenna 103 is improved. The matching network may be a PI-type circuit 1071, the PI-type circuit 1071 being, for example, a combination of capacitance and inductance. The PI-type circuit 1071 is connected to the feeding structure 105 (i.e., RF) through the flexible circuit board 107 and the low-voltage circuit board 106, that is, connected to the port of the antenna 103, so as to adjust the port impedance of the antenna 103 by the PI-type circuit, so that the port of the antenna 103 is in a good matching state, and the radiation performance of the antenna 103 can be improved. In this embodiment, the antenna radiation may be equivalently an RLC resonant network, lr represents an antenna equivalent inductance, cr represents an antenna equivalent capacitance, and Rr represents an antenna equivalent resistance.
As shown in fig. 8, which shows the response chart of the working bandwidth of the antenna 103, it can be seen from fig. 8 that the working bandwidth of the antenna 103 is wide in coverage, and the-10 dB impedance bandwidth can cover the frequency bands of 2.2-2.8GHz and the like, so that the requirement of 2.4GHz communication can be completely met. In addition, the working frequency band of the antenna 103 is wide in coverage and flexible in antenna frequency control, so that the antenna 103 can be expanded to 400MHz implantable device application and sub 6GHz band implantable/wearable device application.
As shown in fig. 2 to 7, in the present embodiment, the antenna 103 has the advantages of small space size, compact operation frequency band, and flexible structure. The antenna 103 is capable of adapting to the communication requirements of different functions and types of implantable medical devices and other narrow application environments, as well as to the application requirements of dynamically variable environments. Meanwhile, the problems of frequency offset and the like caused by liquid leakage phenomenon of the implantable medical device 100 at different positions, different tissue structures and long-time working of a human body can be solved, and stable and reliable wireless communication can be realized. The antenna 103 adopts an all-metal structure, is suitable for low-cost production and application, and has high radiation efficiency of the antenna 103, high working stability of the antenna 103 and strong robustness.
As shown in fig. 9-10, this embodiment further proposes an implantable medical device 100, which differs from fig. 3 in the structure of the antenna 103. The antenna 103 is also disposed outside of the housing assembly 101. The antenna 103 may include a first metal sheet 1031, a second metal sheet 1032, a third metal sheet 1033, and a fourth metal sheet 1034. The first metal sheet 1031, the second metal sheet 1032, the third metal sheet 1033 and the fourth metal sheet 1034 are connected in this order. The connection between the first metal sheet 1031 and the main body circuit board 104 may be as described above. The first metal sheet 1031 is vertically connected with the second metal sheet 1032, and the first metal sheet 1031 is connected with the second metal sheet 1032 in a chamfer manner. The second metal sheet 1032 is vertically connected to the third metal sheet 1033, and the second metal sheet 1032 and the third metal sheet 1033 are coplanar. The second metal sheet 1032 and the third metal sheet 1033 form a bent shape. The third metal sheet 1033 is vertically connected to the fourth metal sheet 1034, and the third metal sheet 1033 and the fourth metal sheet 1034 are connected in a chamfer. The fourth metal sheet 1034 extends in the direction of the main body circuit board 104 so as to be connected to the main body circuit board 104 through the metal probes 108. In this embodiment, the first metal sheet 1031 is connected to a matching network circuit, such as a PI-type circuit, which is disposed on the main circuit board 104 and is used for adjusting the port impedance of the antenna 103, so that the port of the antenna 103 is in a good matching state, and the radiation performance of the antenna 103 can be improved. The end of the fourth metal sheet 1034 is shorted to the main body circuit board 104 through the metal probe 108, thereby forming a current loop of the antenna 103, thereby realizing antenna radiation. In this embodiment, the second metal sheet 1032 and the third metal sheet 1033 are coplanar, the second metal sheet 1032 and the third metal sheet 1033 are perpendicular, and the first metal sheet 1031 may be parallel to the fourth metal sheet 1034 and located on the same side of the plane where the second metal sheet 1032 and the third metal sheet 1033 are located. Since the second metal sheet 1032 and the third metal sheet 1033 form one bent shape, the structure of the head assembly 102 can be adapted.
As shown in fig. 11, in the present embodiment, the height of the first metal sheet 1031 may be smaller than the height of the fourth metal sheet 1034. The length of the second metal sheet 1032 may be less than the length of the third metal sheet 1033. The second metal sheet 1032 and the third metal sheet 1033 form one bent portion in consideration of the shape and structure of the head assembly, and the antenna 103 is accommodated in the head assembly 102, realizing a miniaturized design and a conformal design of the antenna 103. Of course, in some embodiments, two or three bends may also be provided between the first and fourth metal sheets 1031, 1034, thereby allowing the antenna 103 to be better conformal with the head assembly 102.
As shown in fig. 10 and 12, in the present embodiment, a capacitance adjusting circuit is further provided on the back surface of the main body circuit board 104, and one end of the fourth metal sheet 1034 is connected to the capacitance adjusting circuit through a metal probe 108. The capacitance adjusting circuit is used for changing direct-current bias voltage, then changing capacitance value which is connected into a loop in series, realizing the adjustment of the working frequency of the antenna 103, and meeting the frequency reconfigurable requirements of different application scenes. In this embodiment, the adjustable capacitor is a varactor, and may be other adjustable capacitor elements, such as a variable capacitor chip, a switched capacitor array, and a MEMS capacitor. In this embodiment, the varactor is connected to the antenna or the capacitance value in the RF circuit through a Direct Current (DC) flyback varactor, the inductor LS is used in the DC bias circuit to realize isolation (choke) of the radio frequency signal, and the capacitor Cs is used in the ac circuit to realize isolation of the DC signal.
Fig. 13 is a graph showing the operating bandwidth response of the antenna of fig. 9. As can be seen from fig. 13, the operating frequency adjustable range of the antenna is large, and the operating frequency adjustable range of the antenna covers 2-3GHZ and can completely cover the communication requirement of 2.4 GHZ. In actual operation, as the implanted medical device is affected by the surrounding implanted environment, the working frequency of the antenna will deviate, the working frequency of the antenna will be corrected by voltage adjustment and access to the adjustable capacitance value, and the communication frequency band of 2.40GHz is always kept covered. Because the modified antenna has a wider frequency tuning range and a flexible tuning mode, the antenna can be expanded to 400MHz implantable device application and Sub 6GHz band implantable/wearable device application.
As shown in fig. 9-13, in this example, by introducing an adjustable capacitive element on the main circuit board 104, the capacitance value of the series connection is changed, so as to change the effective capacitance value in the overall antenna resonance model, and realize the reconfiguration of the antenna operating frequency. The embodiment adopts an all-metal low-loss structure and one varactor, so that the loss of the antenna is greatly reduced, and meanwhile, the complexity of the adjustable antenna is also reduced to the greatest extent. The working frequency of the antenna is adjustable, so that frequency deviation caused when the implantable medical device leaks under different implantation environments and when the device works for a long time can be well corrected, and the antenna is suitable for communication requirements of the implantable medical device.
In summary, the present invention provides an implantable medical device, which includes a housing assembly and a head assembly, wherein a main circuit board is disposed in the housing assembly, and a capacitance adjusting circuit is disposed on the main circuit board. An antenna is arranged in the head component, one end of the antenna is connected with the capacitance adjusting circuit, the capacitance adjusting circuit comprises a varactor, and the other end of the antenna is connected with the PI type circuit matching network. When the environment around the antenna changes, the capacitance adjusting circuit can change the capacitance value of the serial antenna by changing the direct-current bias voltage, so that the working frequency of the antenna is adjusted, the working frequency of the antenna can meet the requirements of different environments, and the antenna is also suitable for the application requirements of implantable devices in other frequency band modes.
The foregoing description is only illustrative of the preferred embodiments of the present application and the technical principles employed, and it should be understood by those skilled in the art that the scope of the invention in question is not limited to the specific combination of features described above, but encompasses other technical solutions which may be formed by any combination of features described above or their equivalents without departing from the inventive concept, such as the features described above and the features disclosed in the present application (but not limited to) having similar functions being interchanged.
Other technical features besides those described in the specification are known to those skilled in the art, and are not described herein in detail to highlight the innovative features of the present invention.
Claims (8)
1. An implantable medical device, comprising:
a housing assembly;
a head assembly disposed on the housing assembly;
a main body circuit board disposed within the housing assembly;
the capacitance adjusting circuit is arranged on the main circuit board and comprises a varactor and a direct current bias circuit;
the matching network circuit is arranged on the main circuit board and is a PI type circuit; the method comprises the steps of,
the antenna is arranged in the head assembly, the first end of the antenna is connected with the capacitance adjusting circuit, the second end of the antenna is connected with the matching network circuit to form a circular current path, the capacitance adjusting circuit is used for adjusting the working frequency of the antenna, and the matching network circuit is used for adjusting the port impedance of the antenna;
the antenna comprises a first metal sheet, a second metal sheet, a third metal sheet and a fourth metal sheet, wherein the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are sequentially connected, the second end of the antenna is equivalent to the first metal sheet, and the fourth metal sheet is connected with the capacitance adjusting circuit through a metal probe;
the second metal sheet and the third metal sheet are coplanar and are connected vertically, the first metal sheet and the fourth metal sheet are respectively perpendicular to the planes of the second metal sheet and the third metal sheet, and the first metal sheet and the fourth metal sheet are positioned on the same side of the planes of the second metal sheet and the third metal sheet.
2. The implantable medical device of claim 1, wherein the body circuit board is connected to a flexible circuit board through a matching network, the flexible circuit board being connected to a low voltage circuit board.
3. The implantable medical device according to claim 2, wherein the first metal sheet is connected to the low-voltage circuit board by a feed structure.
4. The implantable medical device according to claim 1, wherein the first metal sheet is perpendicular to the second metal sheet, the second metal sheet is perpendicular to the third metal sheet, and the third metal sheet is perpendicular to the fourth metal sheet.
5. The implantable medical device of claim 4, wherein the second metal sheet and the third metal sheet form a bend.
6. The implantable medical device of claim 1, wherein the fourth metal sheet and the capacitance adjustment circuit are located on both sides of the main body circuit board.
7. The implantable medical device according to claim 1, wherein a length of the third metal sheet is greater than a length of the second metal sheet.
8. The implantable medical device according to claim 1, wherein the antenna comprises at least one bend.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110913250.4A CN113644405B (en) | 2021-08-10 | 2021-08-10 | Implantable medical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110913250.4A CN113644405B (en) | 2021-08-10 | 2021-08-10 | Implantable medical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113644405A CN113644405A (en) | 2021-11-12 |
| CN113644405B true CN113644405B (en) | 2023-12-29 |
Family
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