Antenna and implantable medical device

Abstract

The present invention discloses an antenna and an implantable medical device for wireless communication with the aid of the antenna. The medical device comprises: a device housing, a hybrid circuit, an antenna and a feed-through component. The antenna is designed to be a three-dimensional shape, which increases the radiation aperture of the antenna to a certain extent and reduces the two-dimensional area of ​​the antenna. The conductive shell is converted into a partial radiation component through coupling, thereby improving energy transmission efficiency and data transmission distance.

Description

Technical Field

[0001] The invention relates to an antenna which can be packaged in an implantable medical device and connected to a hybrid circuit of the implantable medical device through a feed-through component to achieve far-field communication between the implantable medical device and an in vitro remote device, and is suitable for medical instruments and clinical fields. Background Art

[0002] Implantable medical devices (implants) are widely available to provide diagnostic or therapeutic capabilities. Three types of active implantable products, including implantable cardioverter defibrillators (ICDs), implantable cardiac monitors (ICMs), implantable pacemakers (Cardiac Pacemakers), leadless implantable pacemakers, subcutaneous implantable cardioverter defibrillators (SICDs), and various tissue, organ, and nerve stimulators or sensors, generally require doctors or professionals to use an external programmer to achieve wireless communication with the implant stimulator to complete data transmission, implant software upgrades, emergency stop and other possible functions. The purpose of the present invention is to solve the efficiency and quality of wireless communication, improve the efficiency of wireless transmission, and avoid communication problems or failures.

[0003] The traditional communication method uses inductive near-field coupling to perform wireless communication at a distance of several centimeters. The disadvantages of this method are: the communication distance is too short, the usage is limited and the data rate is low, which is generally thousands or tens of kilobits.

[0004] With the advancement of technology, remote communication between implant circuits and external programmers and other remote control devices has become possible, and is increasingly being used in equipment control, data transmission, and real-time monitoring. Implants and external devices can communicate at a distance of several meters. As one of the hardware foundations of communication, the implanted antenna is placed in the connector outside the shell, which ensures that the energy radiated by the antenna is not absorbed by the metal shell and is conducted to the maximum extent.

[0005] As circuits and structures become more integrated and miniaturized, the physical space of antennas is limited. Generally speaking, the communication distance is related to the radiation efficiency / gain of the antenna, the transmission power of the transmitting antenna, and the sensitivity of the receiving antenna. The efficiency / gain of the antenna is positively correlated with the size of the antenna. In order to maximize the antenna efficiency and increase the maximum transmission distance, designers have proposed various solutions. For example, modify the communication frequency and decoding method so that the system has better sensitivity to the signal under the same hardware conditions; or try to design an antenna with better directionality in the hope of achieving better efficiency in a certain direction; or add a matching network to achieve smaller return loss and better radiation efficiency, which can achieve a longer transmission distance at a specific frequency. These methods are usually undesirable because they either deviate from the communication frequency band allowed by the implant in the regulations in actual situations, or require additional requirements during surgery, or it is difficult to maintain the stability of communication in a changing environment, and increase the number of devices required.

[0006] Generally speaking, in order to achieve a relatively ideal antenna efficiency, the total length of the antenna needs to be at least one quarter to one half of a wavelength. Reducing the antenna length will reduce the radiation impedance of the antenna, making it more difficult to match the antenna with the source end and to couple with the air impedance, thereby significantly reducing the antenna efficiency. This example proposes a solution to increase the effective radiation efficiency of the antenna. The antenna is bent multiple times in three-dimensional space and coupled with the shell to obtain better radiation capability. Summary of the invention

[0007] The present invention discloses an antenna, which includes four parts. The first part is a bending section formed by a U-shaped section and an arc section, the U-shaped mouths of two adjacent U-shaped sections are in opposite directions, the planes where any two adjacent U-shaped sections are located are perpendicular to each other, the planes where all the arc sections are located are parallel to each other, and the U-shaped section is located in two planes, wherein the plane where the arc section is located and the two planes where the U-shaped section is located are perpendicular; the second part is an L-shaped section (EF), the two sides of the L-shaped section are of different lengths and perpendicular to each other, wherein the short side of the L-shaped section is connected to the arc section of the first part, and the plane where the L-shaped section is located is perpendicular to the plane where the arc section in the first part is located; the third part is an arc section, connecting the long side of the L-shaped section of the second part with the fourth part, wherein the plane where the bending section of the third part is located is perpendicular to the plane where the bending section of the first part is located; the fourth part is a bending section in the same plane, and the plane where the bending section of the fourth part is located is perpendicular to the plane where the bending section of the third part is located.

[0008] The antenna is for MICS microwave communication, and the operating frequency is MICS 402MHz to 405MHz.

[0009] The antenna is a monopole antenna without a dual structure and a single feed point structure.

[0010] The bending section of the antenna includes a vertical Z-shape, multiple consecutive vertical Z-shapes, a horizontal Z-shape, multiple consecutive horizontal Z-shapes, a horizontal trapezoid, multiple consecutive horizontal trapezoids, a vertical trapezoid, multiple consecutive vertical trapezoids, a horizontal W-shape, multiple consecutive horizontal W-shapes, a vertical W-shape, and multiple consecutive vertical W-shapes.

[0011] The arc segment of the first part of the antenna is perpendicular to the plane where the arc segment of the third part is located, and the plane where the arc segment of the first part of the antenna is located is parallel to the plane where the bending segment of the fourth part is located.

[0012] All the U-shaped segments of the first part of the antenna have the same size and shape, and the distance between two adjacent U-shaped segments is the same.

[0013] All arc segments of the first part of the antenna have the same size and shape, the spacing between adjacent arc segments is the same, and all arc segments are obtained by translating a certain U-shaped segment.

[0014] The end of the antenna bending section is connected to the main device through an integral structure formed by connecting an arc section and a plane section.

[0015] The present invention discloses an implantable medical device, which consists of four parts: a device housing, a hybrid circuit, an antenna and a feed-through component. The antenna includes four parts. The first part is a bent section formed by a U-shaped section and an arc section. The U-shaped openings of two adjacent U-shaped sections are in opposite directions. The planes where any two adjacent U-shaped sections are located are perpendicular to each other. The planes where all the arc sections are located are parallel to each other. The U-shaped section is located in two planes, wherein the plane where the arc section is located is perpendicular to the two planes where the U-shaped section is located. The second part is an L-shaped section (EF). The two sides of the L-shaped section are of different lengths and perpendicular to each other. The short side of the L-shaped section is connected to the arc section of the first part, and the plane where the L-shaped section is located is perpendicular to the plane where the arc section in the first part is located. The third part is an arc section, which connects the long side of the L-shaped section of the second part to the fourth part, wherein the plane where the bent section of the third part is located is perpendicular to the plane where the bent section of the first part is located. The fourth part is a bent section in the same plane, and the plane where the bent section of the fourth part is located is perpendicular to the plane where the bent section of the third part is located.

[0016] The antenna of the medical device is connected to the medical device body through a feed-through component and is packaged in the feed-through component.

[0017] The radiation part of the implant medical device is composed of an antenna body and an implant shell.

[0018] The implantable medical device comprises a hybrid circuit module, which comprises a radio frequency antenna, a radio frequency chip and corresponding software configuration, wherein the radio frequency part of the implant comprises an antenna debugging chip.

[0019] The antenna of the medical device is connected to the main body of the medical device through an integral structure formed by connecting a circular arc segment and a plane segment.

[0020] The edge line of the medical device is parallel to the long side of the L-shaped segment in the second part of the antenna.

[0021] The antenna of the medical device is folded for the last time at the bottom parallel to the housing.

[0022] The present invention discloses an implantable medical device capable of transmitting signals to an external remote device via an antenna. In some examples, the implantable medical device can automatically trigger the sensing of ECG signal parameters inside the heart, for example, without a trigger input initiated from an external source, such as based on a request initiated from a patient or by a doctor from an external device, and at least partially based on one or more physiological parameters of the patient, and transmit the sensed physiological parameters to an exogenous far-field device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the appearance structure of an implantable medical device and the relative positions of its components in the heart when it is implanted inside the heart.

[0024] Figure 2 Schematic diagram of the three-dimensional structure of the antenna.

[0025] Figure 3 for Figure 2 The schematic diagram of the relative position structure of the antenna installed on the implantable medical device ICD is shown.

[0026] Figure 4 For Figure 3 Schematic diagram of the structure of the position of the antenna installed in the implantable medical device ICD as seen from the direction of the middle arrow T.

[0027] Figure 5 for Figure 2 A schematic diagram of a structure in which the number of U-shaped and arc segments of the first part of the antenna is reduced.

[0028] Figure 6 for Figure 2 A schematic diagram of a structure after the number of U-shaped and arc segments in the first part of the antenna is increased.

[0029] exist Figure 2 , Figure 5 and Figure 6 In the figure, the antenna is divided into four parts by dotted lines: a first part, a second part, a third part and a fourth part. Antennas in different dotted boxes in the figure represent different parts of the antenna. The parts enclosed in each dotted box belong to a common part and do not represent a plane.

[0030] exist Figure 3 and Figure 4 In the figure, the dotted line represents the plane where the dotted frame is located. Every four dotted lines form a dotted frame. One dotted frame is located in one plane. The three dotted frames in the figure represent the three planes where the three dotted frames are located respectively. These three planes are perpendicular to each other. Figure 3 and Figure 4 The planes in (plane I, plane II and plane III) are parallel. DETAILED DESCRIPTION

[0031] The present invention Figure 1 , Figure 5 and Figure 6 The antennas of the three structures shown all include four parts. The difference in the antenna structure is only in the number of U-shaped segments and circular arc segments in the first part.

[0032] The shape of the bent section of the fourth part of the antenna can be Figure 2 In addition to the vertical trapezoid shown, in actual operation, the bending section can also be one of vertical Z-shape, multiple vertical Z-shapes in succession, horizontal Z-shape, multiple horizontal Z-shapes in succession, horizontal trapezoid, multiple horizontal trapezoids in succession, multiple vertical trapezoids in succession, horizontal W-shape, multiple horizontal W-shapes in succession, vertical W-shape, and multiple vertical W-shapes in succession, or a combination thereof. However, it is necessary to ensure that the bending sections of various shapes are parallel to plane II.

[0033] The antenna of the present invention is a monopole antenna without a dual structure and a single feed point structure. The biggest feature of the monopole antenna is that it can provide satisfactory radiation characteristics over a wide frequency band, and it also has many advantages such as simple structure, light weight, simple feeding structure, easy analysis, and good omnidirectional characteristics. The raw material of the antenna can be copper plate or tin-plated steel plate. The working principle of the antenna is MICS microwave communication, and the antenna works at a frequency from MICS 402MHz to MICS 405MHz. The effective radiation efficiency of the antenna is increased by high frequency, and better radiation capability is obtained by multiple bending in three-dimensional space. The antenna can be packaged in implantable cardiac defibrillators, implantable heart monitors, implantable cardiac pacemakers, leadless implantable cardiac pacemakers, subcutaneous implantable cardiac defibrillators, and various tissues, organs, and neural stimulators or sensors and other implantable medical devices, wherein the relative position structural diagram of the antenna installed to the implantable cardioverter defibrillator ICD is shown in Figure 3 and Figure 4 .

[0034] Figure 1Schematic diagram of the appearance structure of ICD100 and the relative positions of its components in the heart when implanted in the heart. ICD consists of four parts: device housing 105, hybrid circuit in the device housing, antenna and feedthrough assembly. The antenna is encapsulated in the feedthrough assembly of the ICD head structure 107, and the feedthrough assembly not only encapsulates the antenna feedthrough, but also the wire feedthrough. See the wire feedthrough Figure 5 In the ICD head structure, the wire feedthrough is connected to the wire 115, and the ICD main circuit board is connected to the heart through the antenna to sense the ECG signal parameters or perform treatment through electric shock. The inside of the device shell usually includes a power supply, a capacitor, and a hybrid circuit. The function of the hybrid circuit is usually implemented by program coding. The function of the ICD can be realized in two ways. One is the automatic regulation inside the ICD body, which does not require manual triggering and control and can be realized automatically. The other is to send a communication signal 185 through an external program-controlled device 190. The external program-controlled device of the ICD is generally a program controller, a patient assistant or other device that can issue instructions to it or sense its internal signals. The communication method between the ICD and the external program-controlled device 190 can be one or more of wired communication, Bluetooth, WIFI, LTE or CDMA and other wireless communication networks. Figure 1 The ICD lead 115 shown is a single lead, and may also be a double lead, a triple lead, or a quadruple lead during clinical use. The basic structure of the lead is similar to that of the lead 115. The lead 115 is composed of a coil 118, an electrode 120A, and an electrode 120B. The coil 118 is connected to the ICD body through a connector 107. The function of the coil is to achieve the purpose of sensing or treatment through discharge. The electrode 120A and the electrode 120B sense the signal parameters of the cardiac event. The electrode 120B is also called a spiral head, and contains a spiral coil inside. The spiral electrode 120A on the lead is screwed inside the insulating material outside the lead before use, and can be screwed out from the other end of the lead before implantation into the human heart, so that the electrode end 120A of the lead is fixed to the myocardial tissue inside the heart. The electrode lead needs to be coated with insulating materials such as silicone, polyurethane, or epoxy resin.

[0035] Figure 2 Figure 1 is a schematic diagram of the three-dimensional structure of the antenna. For the convenience of explanation and description, Figure 2 The antenna nodes are marked in the order of A, B, C, D, E, F, G, H, I, J, K, L, M, and N from one end of the antenna to the other. The antenna consists of four parts. The first part includes the part from F to N, which is a bending section composed of a U-shaped section and a circular arc section. The bending section of the first part of the antenna can be designed as Figure 2In addition to the 4 arc segments and 3 U-shaped segments shown, other integer numbers of arc segments and U-shaped segments can also be designed. The U-shaped openings of two adjacent U-shaped segments in the first part of the antenna are opposite, and the planes where any two adjacent U-shaped segments are located are perpendicular to each other, that is, the plane where IJ is located is perpendicular to the plane where GH is located and the plane where KL is located. The sizes and shapes of all arc segments in the first part of the antenna can be the same or different, that is, the shapes, sizes and lengths of FG, IH, JK and ML can be the same or different. Under the same circumstances, all arc segments FG, IH, JK and ML in the first part can be regarded as being obtained by translating any one of the arc segments. Combined Figure 3 or Figure 4 From the three planes marked in the figure, it can be seen that the planes where all the arc segments of the first part of the antenna are located are parallel to plane II, and the planes where all the arc segments are located are perpendicular to the planes where the U-shaped segments are located. The U-shaped segments of the first part are located in two planes, and the positions of different U-shaped segments in any of the two planes are different. The second part is an L-shaped segment EF, and the two sides of the L-shaped segment are of different lengths and perpendicular to each other, wherein the short side of the second part is connected to the arc segment of the first part, the plane where the L-shaped segment is located is perpendicular to the plane where the arc segment of the first part is located, and the plane where the L-shaped segment is located is in the same plane as some U-shaped segments in the first part; the third part is an arc segment DE, connecting the long side of the L-shaped segment of the second part to the bending segment CD of the fourth part, and the plane where the bending segment DE of the third part is located is perpendicular to the plane where the bending segment of the first part is located; the fourth part is a bending segment CD in the same plane, and the plane where the bending segment CD is located is perpendicular to the plane where the bending segment of the third part is located.

[0036] Figure 3 for Figure 2 The schematic diagram of the relative position structure of the antenna installed on the implantable medical device ICD is shown. Figure 3The three planes marked by the dotted lines, namely plane I, plane II and plane III, are perpendicular to each other. The plane where all the arc segments of the first part of the antenna are located is parallel to plane II, and the U-shaped segment directly connected to the arc segment connected to the second part in the first part is parallel to plane I. The L-shaped segment of the second part is parallel to plane III. The arc segment DE of the third part is parallel to plane I. The plane where the arc segment DE of the third part is located is perpendicular to the plane where all the arc segments of the first part are located. The plane where the bending segment CD of the fourth part is located is parallel to the plane where the arc segments of the first part are located. The antenna is connected to the main body of the medical device through an integral structure formed by connecting an arc segment DE and a plane segment EF. 308 is the device shell of the medical device, and the device shell contains a hybrid circuit to complete the sensing and communication functions of the implanted device for electrocardiographic parameters. A feedthrough component is encapsulated in the head of the ICD, and the feedthrough component includes an antenna feedthrough and a wire feedthrough. The antenna feedthrough is a component that connects the antenna and the device body. 304 is a fixed structure located at the head of the ICD for fixing the wire feedthrough, and 306 is a fixed part for fixing the fixed structure 304 to the ICD. The fixing methods of the fixed structure 304 include: mechanical structure fixing, glue bonding, bolt connection, welding, riveting, interference fit between the shaft and the hole, transition fit between the shaft and the hole, clearance fit, key connection and then tightening with threads, etc. The raw material of the fixed structure 304 should be a conductor material with conductive function, and the antenna 302 is connected to the circuit board inside the implanted medical device, so that the antenna is connected to the circuit inside the device to play the wireless communication function.

[0037] Figure 4 For Figure 3Schematic diagram of the position structure of the antenna installed in the implantable medical device ICD as viewed from the direction of the middle arrow T. The antenna is connected to the main body of the medical device through an integral structure composed of a circular arc segment and a plane segment. 416 is the device shell of the medical device, and the device shell contains a hybrid circuit inside to complete the sensing and communication functions of the implanted device for ECG parameters. A feedthrough component is encapsulated in the head of the ICD, and the feedthrough component includes an antenna feedthrough and a wire feedthrough. The antenna feedthrough is a component that connects the antenna and the device body. One end of the antenna 402 is connected to the internal circuit board of the device body through the antenna feedthrough, and the interface is sealed by a circular isolation sheet. 406 is a wire coil. Usually, a medical device contains 1 to 6 wire coils, and each wire coil is separated by an insulator 404 to prevent the wires from being connected and causing a short circuit in the device. The wire coil is separated from the main body of the medical device and can be wound at intervals on a shaft fixed to the head of the ICD. The shaft is fixed to the head of the ICD through a fixing structure 408, and the fixing structure 408 is fixed to the head of the ICD through a part 410. Each wire coil 406 is connected one by one to the hybrid circuit inside the device body 416 through the wire 412. Usually, the coil of the wire connected to the hybrid circuit is designed to a fixed range area, which can save space. All wires are packaged together in a fixed space, and the interface between the wire and the main device is sealed by a circular isolation sheet. The hybrid circuit is located in the head of the medical device body. The hybrid circuit coils are separated by a silicone insulator 404. A silicone insulator is designed between every two coils to prevent the connection between the wires from causing a short circuit in the device. 414 is a ground wire, which grounds the circuit board inside the device to form a loop for wireless signal transmission. The ICD and the in vitro programmer each have a set of hardware configurations, including a radio frequency antenna, a radio frequency chip and corresponding software configurations.

[0038] The antenna is connected to the internal circuit board of the implanted medical device through an integral structure composed of a circular arc segment BC and a plane segment AB, so as to realize the far-field communication between the implanted medical device and the external remote device. The antenna should be encapsulated inside the implanted medical device. Since the length of the antenna is positively correlated with the sensitivity of the antenna to transmit and receive signals, the length of the antenna should be as long as possible to enhance the signal transmission sensitivity of the antenna. The width and thickness of the antenna can be appropriately adjusted according to the applicable implanted medical device. The width and thickness of the antenna should be determined according to the fixing method. The antenna of the present invention can be fixed by appropriately widening any one or several sections of the antenna main structure and selecting an appropriate method. Common fixing methods of the antenna include: mechanical structure fixing by punching, glue bonding, bolt connection, welding, riveting, interference fit between the shaft and the hole, transition fit between the shaft and the hole, clearance fit, key connection and then tightening with threads, etc. The antenna of the present invention can also widen any section on the main body, and punch holes on the widened section surface, the number of holes is 0 to 10, the hole size can be adjusted in combination with the size of the specific medical device, and the holes of the antenna are used to fix the antenna in the ICD head. The fixing method can be selected through glue bonding, bolt connection, welding, riveting, interference fit between the shaft and the hole, transition fit between the shaft and the hole, clearance fit, key connection and then tightening with threads, etc.

[0039] Implantable medical devices (implants) are commonly used to provide diagnostic or therapeutic capabilities. Three types of active implantable products, including implantable cardiac defibrillators, implantable heart monitors, implantable pacemakers, leadless implantable pacemakers, subcutaneous implantable cardiac defibrillators, and various tissue, organ and nerve stimulators or sensors, generally require doctors or professionals to use an external programmer to achieve wireless communication with the implant stimulator to complete data transmission, implant software upgrades, emergency stop and other possible functions. This embodiment takes ICD as an example to illustrate the working scheme of the antenna in an implantable medical device.

[0040] Figure 5 for Figure 2 A schematic diagram of a structure in which the number of U-shaped and circular arc segments in the first part of the antenna is reduced. Figure 5 The antenna is marked with some nodes in the order of capital letters A to L from one end to the other. The antenna consists of four parts. The first part includes the letters F to L, which is a curved section composed of a U-shaped section and a circular arc section. The U-shaped openings of the two U-shaped sections GH and TJ are opposite, and the plane where the U-shaped section GH is located is perpendicular to the plane where TJ is located. Figure 3 or Figure 4Among the three planes marked in the figure, the planes where all the arc segments of the first part of the antenna are located are parallel to plane II, and the planes where all the arc segments are located are perpendicular to the planes where the U-shaped segments are located. The U-shaped segment of the first part is located in two planes, and the position of the U-shaped segment in any of the two planes is different. The second part is an L-shaped segment EF, and the two sides of the L-shaped segment are of different lengths and perpendicular to each other, wherein the short side of the second part is connected to the arc segment of the first part, the plane where the L-shaped segment is located is perpendicular to the plane where the arc segment of the first part is located, and the plane where the L-shaped segment is located is in the same plane as some U-shaped segments in the first part; the third part is an arc segment DE, connecting the long side of the L-shaped segment of the second part to the bending segment CD of the fourth part, and the plane where the bending segment DE of the third part is located is perpendicular to the plane where the bending segment of the first part is located; the fourth part is a bending segment CD in the same plane, and the plane where the bending segment CD is located is perpendicular to the plane where the bending segment of the third part is located.

[0041] Figure 6 for Figure 2 A schematic diagram of a structure after the number of U-shaped and circular arc segments in the first part of the antenna is increased. Figure 6 The antenna is marked with some nodes of the antenna in the order of capital letters A to L from one end to the other. The antenna includes four parts. The first part includes the part of letters F to R, which is a bending section composed of U-shaped segments and circular arc segments. In the first part of the antenna, the U-shaped segments GH, KL and OP are located in the same plane, TJ and MN are located in the same plane, and the plane where the U-shaped segment GH is located is perpendicular to the plane where TJ is located. The U-shaped segment of the first part of the first part of the antenna is located in two planes, and the position of the U-shaped segment in any of the two planes is different. The plane where the circular arc segment of the first part is located is perpendicular to the plane where all the U-shaped segments are located. The second part is an L-shaped segment EF, and the two sides of the L-shaped segment are of different lengths and perpendicular to each other, wherein the short side of the second part is connected to the arc segment of the first part, the plane where the L-shaped segment is located is perpendicular to the plane where the arc segment of the first part is located, and the plane where the L-shaped segment is located is in the same plane as the U-shaped segment in the first part; the third part is an arc segment DE, connecting the long side of the L-shaped segment of the second part with the bending segment CD of the fourth part, and the plane where the bending segment DE of the third part is located is perpendicular to the plane where the bending segment of the first part is located; the fourth part is a bending segment CD in the same plane, and the plane where the bending segment CD is located is perpendicular to the plane where the bending segment of the third part is located.

[0042] The present invention discloses a special-shaped antenna applicable to wireless communication of an implanted medical device. The present invention designs the antenna into a three-dimensional shape. The antenna of the medical device is folded for the last time below the shell in parallel with the shell. The parallel part can increase the capacitance between the antenna and the shell, and the shell can be converted into a partial radiation component through coupling, thereby maximizing the radiation aperture of the antenna, reducing the two-dimensional area of ​​the antenna, improving the radiation efficiency, and improving the energy transmission efficiency and the data transmission distance.

Claims

1. A monopole antenna, characterized in that: The antenna includes four parts, the first part is a bending section formed by a U-shaped section and an arc section, the U-shaped openings of two adjacent U-shaped sections are in opposite directions, the planes where any two adjacent U-shaped sections are located are perpendicular to each other, the planes where all the arc sections are located are parallel to each other, the U-shaped section is located in two planes, wherein the plane where the arc section is located and the two planes where the U-shaped section is located are perpendicular; the second part is an L-shaped section, the two sides of the L-shaped section are of different lengths and perpendicular to each other, wherein the short side of the L-shaped section is connected to the arc section of the first part, the plane where the L-shaped section is located is perpendicular to the plane where the arc section in the first part is located, and the plane where the L-shaped section is located and the U-shaped section in the first part are located in the same plane; the third part is an arc section, the L-shaped section of the second part is connected to the arc section of the first part, the plane where the L-shaped section is located is perpendicular to the plane where the arc section in the first part is located, and the plane where the L-shaped section is located and the U-shaped section in the first part are located in the same plane; The long side of the shaped segment is connected to the fourth part, wherein the plane where the bending section of the third part is located is perpendicular to the plane where the bending section of the first part is located; the fourth part is a bending section in the same plane, and the plane where the bending section of the fourth part is located is perpendicular to the plane where the bending section of the third part is located; the arc segment of the first part is perpendicular to the plane where the arc segment of the third part is located, and the plane where the arc segment of the first part is located is parallel to the plane where the bending section of the fourth part is located.

2. A monopole antenna as claimed in claim 1, characterized in that: The antenna is for MICS microwave communication, and the operating frequency is MICS 402MHz to 405MHz.

3. A monopole antenna as claimed in claim 2, characterized in that: The antenna is a monopole antenna without a dual structure and a single feed point structure.

4. A monopole antenna as claimed in claim 3, characterized in that: The bending section of the antenna includes a vertical Z-shape, a plurality of consecutive vertical Z-shapes, a horizontal Z-shape, a plurality of consecutive horizontal Z-shapes, a horizontal trapezoid, a plurality of consecutive horizontal trapezoids, a vertical trapezoid, a plurality of consecutive vertical trapezoids, a horizontal W-shape, a plurality of consecutive horizontal W-shapes, a vertical W-shape, and a plurality of consecutive vertical W-shapes.

5. A monopole antenna as claimed in claim 1, characterized in that: All the U-shaped segments of the first part of the antenna have the same size and shape, and the distance between two adjacent U-shaped segments is the same.

6. A monopole antenna as claimed in claim 5, characterized in that: All arc segments of the first part of the antenna have the same size and shape, the spacing between adjacent arc segments is the same, and all arc segments are obtained by translating a certain U-shaped segment.

7. A monopole antenna as claimed in claim 6, characterized in that: The end of the antenna bending section is connected to the main device through an integral structure formed by connecting an arc section and a plane section.

8. An implantable medical device, characterized in that: The medical device is composed of four parts: a device housing, a hybrid circuit, an antenna, and a feed-through component. The antenna includes four parts. The first part is a bent section formed by a U-shaped segment and an arc segment. The U-shaped openings of two adjacent U-shaped segments are in opposite directions. The planes where any two adjacent U-shaped segments are located are perpendicular to each other. The planes where all the arc segments are located are parallel to each other. The U-shaped segment is located in two planes, wherein the plane where the arc segment is located and the two planes where the U-shaped segment is located are perpendicular to each other. The second part is an L-shaped segment. The two sides of the L-shaped segment are of different lengths and perpendicular to each other. The short side of the L-shaped segment is connected to the arc segment of the first part. The plane where the L-shaped segment is located is perpendicular to the plane where the arc segment in the first part is located, and the plane where the L-shaped segment is located is in the same plane as the U-shaped segment in the first part. The third part is an arc segment. The long side of the shaped segment is connected to the fourth part, wherein the plane where the bending section of the third part is located is perpendicular to the plane where the bending section of the first part is located; the fourth part is a bending section in the same plane, and the plane where the bending section of the fourth part is located is perpendicular to the plane where the bending section of the third part is located; the arc segment of the first part is perpendicular to the plane where the arc segment of the third part is located, and the plane where the arc segment of the first part is located is parallel to the plane where the bending section of the fourth part is located; the radiation part of the implanted medical device is composed of an antenna body and a device shell.

9. An implantable medical device according to claim 8, characterized in that: The antenna of the medical device is connected to the medical device body through a feed-through component and is packaged in the feed-through component.

10. An implantable medical device according to claim 9, characterized in that: The implantable medical device comprises a hybrid circuit module, which comprises a radio frequency antenna, a radio frequency chip and corresponding software configuration, wherein the radio frequency part of the implant comprises an antenna debugging chip.

11. An implantable medical device as claimed in claim 8, characterized in that: The antenna of the medical device is connected to the main body of the medical device through an integral structure formed by connecting an arc segment and a plane segment.

12. An implantable medical device according to claim 11, characterized in that: The edge line of the medical device is parallel to the long side of the L-shaped segment in the second part of the antenna.

13. An implantable medical device according to claim 12, characterized in that: The antenna of the medical device is folded for the last time below and parallel to the housing.

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