CN115954668A - Implantable medical device - Google Patents
Implantable medical device Download PDFInfo
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- CN115954668A CN115954668A CN202211355758.8A CN202211355758A CN115954668A CN 115954668 A CN115954668 A CN 115954668A CN 202211355758 A CN202211355758 A CN 202211355758A CN 115954668 A CN115954668 A CN 115954668A
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- metal shell
- medical device
- implantable medical
- circuit board
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- 239000002184 metal Substances 0.000 claims abstract description 155
- 229910052751 metal Inorganic materials 0.000 claims abstract description 155
- 230000005855 radiation Effects 0.000 claims abstract description 41
- 239000000758 substrate Substances 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 8
- 210000004556 brain Anatomy 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000000638 stimulation Effects 0.000 description 4
- 230000000747 cardiac effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000001054 cortical effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000000278 spinal cord Anatomy 0.000 description 2
- 230000007384 vagal nerve stimulation Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000007383 nerve stimulation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 210000001186 vagus nerve Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides an implantable medical device comprising a metal housing, a circuit board, an antenna and at least one connection structure. The connecting structure is connected with a radio frequency ground of the circuit board and a connecting point of the metal shell to change the electromagnetic property of the metal shell, the distance between the connecting point and the antenna hole is m, the extending path length of the connecting structure between the connecting point and the radio frequency ground is n, the working wavelength of the antenna is lambda, and m + n is less than or equal to 0.2 lambda, so that the radiation frequency of the metal shell is far away from the working frequency of the antenna, the radiation interference of the radiation of the metal shell on the antenna is reduced, namely the loss of the radiation electromagnetic wave energy of the metal shell on the antenna is reduced, and the radiation efficiency of the antenna is improved.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to implantable medical equipment.
Background
Implantable medical devices, including Deep Brain Stimulation (DBS), implantable cortical brain stimulation (CNS), implantable Spinal Cord Stimulation (SCS), implantable Sacral Nerve Stimulation (SNS), implantable Vagal Nerve Stimulation (VNS), implantable cardiac electrical stimulation systems (commonly referred to as cardiac pacemakers), implantable drug infusion systems (IDDS), etc., may implement data interaction with an extracorporeal device by way of wireless communication.
The antenna is one of key components in a wireless communication system of the implantable medical device, and because one part of the antenna is arranged inside a relatively closed metal shell, electromagnetic waves radiated by the antenna part can be attenuated inside the metal shell, so that the radiation efficiency of the antenna is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to an implantable medical device, which increases the radiation frequency of a metal shell, reduces the loss of electromagnetic wave energy radiated from an antenna by the metal shell, and improves the radiation efficiency of the antenna.
In a first aspect, an embodiment of the present invention provides an implantable medical device, including:
the metal shell is provided with an antenna hole and a connecting point which is spaced from the antenna hole by m;
the circuit board is arranged inside the metal shell and is provided with a radio frequency ground;
the antenna at least partially extends into the metal shell from the antenna hole so as to be connected with the circuit board; and
at least one connection structure located inside the metal shell;
the connecting structure is connected with the connecting point and the radio frequency ground, the extending path length of the connecting structure between the connecting point and the radio frequency ground is n, the working wavelength of the antenna is lambda, and m + n is less than or equal to 0.2 lambda, so that the radiation frequency of the metal shell is far away from the working frequency of the antenna.
Further, in some embodiments of the present invention, the connection structure is an electrical conductor or a circuit including at least one of a resistor, a capacitor, and an inductor.
Further, in some embodiments of the present invention, the connection structure is a circuit, and in an operating frequency band of the antenna, a real impedance part of the connection structure is less than 20 Ω, and an absolute value of an imaginary impedance part of the connection structure is less than 20 Ω.
Further, in some embodiments of the present invention, the antenna includes a main body portion and an extension portion connected to each other, the main body portion is located outside the metal shell, the metal shell is provided with a plurality of antenna holes, and the extension portion extending into the metal shell and connected to the circuit board is disposed in the plurality of antenna holes.
Further, in some embodiments of the present invention, the connecting structures are respectively disposed between the metal shell and the circuit board corresponding to the plurality of antenna holes.
Further, in some embodiments of the present invention, the circuit board is connected to the connecting structures at two sides of the antenna, and the metal shell is correspondingly provided with grounding points at two opposite sides of the antenna hole.
Further, in some embodiments of the present invention, the metal case includes a feedthrough ring mounted to the antenna aperture, the antenna passing through a ring aperture of the feedthrough ring.
Further, in some embodiments of the present invention, the connection point is provided on the feed-through ring;
the connecting structure connects the feed-through ring and connects the metal shell through the feed-through ring.
Further, in some embodiments of the present invention, the circuit board includes a dielectric substrate and a plurality of metal layers, the dielectric substrate is used for separating adjacent metal layers, and the plurality of metal layers include a metal layer used as the radio frequency ground.
Further, in some embodiments of the present invention, the metal case has a first sidewall facing the board surface of the circuit board and a second sidewall adjacent to the first sidewall, and the first sidewall or the second sidewall is provided with the antenna hole.
The invention provides an implantable medical device which comprises a metal shell, an antenna circuit board and a connecting structure, wherein one part of an antenna extends into the metal shell through an antenna hole and is connected with the circuit board, the connecting structure is connected with a connecting point of the metal shell and a radio frequency ground of the circuit board, the electromagnetic performance of the metal shell is changed, the relation among the connecting point, the antenna hole, the connecting structure and the antenna wavelength is that m + n is less than or equal to 0.2 lambda, the radiation frequency of the metal shell is far away from the working frequency of the antenna, namely the radiation interference of the radiation of the metal shell to the antenna is reduced, therefore, the loss of the radiation electromagnetic wave energy of the antenna by the metal shell is reduced, and the radiation efficiency of the antenna is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of an implantable medical device according to one embodiment of the present invention;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1 including the n and m labels of the present invention;
FIG. 3 isbase:Sub>A schematic sectional view taken partially along line A-A of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic perspective view of an implantable medical device according to an embodiment of the present invention;
FIG. 5 is a schematic view of an implantable medical device according to a second embodiment of the present invention;
FIG. 6 is a schematic view of an implantable medical device according to a third embodiment of the present invention;
FIG. 7 is a schematic view of an implantable medical device according to a fourth embodiment of the present invention;
FIG. 8 is a schematic view of an implantable medical device according to a fifth embodiment of the present invention;
FIG. 9 is a schematic view of an implantable medical device according to a sixth embodiment of the present invention;
FIG. 10 is a schematic view of an implantable medical device according to a seventh embodiment of the present invention;
FIG. 11 is a graph comparing the actual test results of the antenna performance of an implantable medical device according to an embodiment of the present invention with those of a conventional medical device;
fig. 12 is a comparison graph of the antenna performance of the first and second implantable medical devices according to the present invention and the actual performance of the conventional medical device.
Description of reference numerals:
1-a metal shell; 11-a first side wall; 12-a second side wall;
2-an antenna; 3-a top cover; 4-a linking structure; 5-a circuit board;
51-an auxiliary structure; 511-conductive vias;
521-a first metal layer; 522-a second metal layer; 523-a third metal layer; 524-fourth metal layer; 525-a fifth metal layer;
53-dielectric substrate; 6-antenna aperture; 61-feed-through ring.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the description of the present disclosure, it should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
The implantable medical device realizes data interaction with the extracorporeal device in a wireless communication mode, and the antenna is one of key components in a wireless communication system of the implantable medical device. The antenna is led out from a radio frequency signal output port positioned in the metal shell, passes through an antenna hole on one side of the metal shell and then extends to the outside of the metal shell. After the antenna is fed, the electromagnetic wave radiated by the antenna part can be attenuated inside the metal shell.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Fig. 1 is a schematic view of an implantable medical device according to an embodiment of the present invention, and fig. 2 is a partial structural view of fig. 1 including n and m marks according to the present invention.
The invention provides an implantable medical device, which comprises a metal shell 1, a circuit board 5, an antenna 2 and at least one connecting structure 4. The metal shell 1 accommodates a circuit board 5, a connecting structure 4 and a part of the antenna 2, the circuit board 5 is connected with the antenna 2, and the circuit board 5 provides radio frequency signals for the antenna 2.
In the invention, the metal shell 1 is made of titanium alloy material, compared with other materials, the titanium alloy is not easy to deform, the antenna design with maximum space utilization efficiency can be realized, and the metal shell has better biocompatibility.
As shown in fig. 1-2, the metal shell 1 is provided with an antenna hole 6, the antenna hole 6 is provided with a feed-through loop 61, a part of the antenna 2 extends into the metal shell 1 through the loop hole of the feed-through loop 61 and is connected with the circuit board 5 in the metal shell 1, and another part of the antenna 2 is arranged outside the metal shell 1, so that the radiation signal of the antenna 2 can be enhanced. The rf ground comprises an auxiliary structure 51, the auxiliary structure 51 being of a metallic material, preferably copper. The auxiliary structure 51 may be provided on the dielectric substrate in the form of a metal layer. The connection structure 4 is provided with one, one side of the connection structure 4 is connected with the auxiliary structure 51, and the other side of the connection structure 4 is connected with the metal case 1, thereby changing the electromagnetic characteristic of the metal case 1 to change the frequency radiated by the metal case 1. The position where the metal shell 1 is connected with the connecting structure 4 is defined as a connecting point, the distance between the connecting point and the antenna hole 6 is m, the length of an extending path between the connecting point and the radio frequency ground of the connecting structure 4 is n, the wavelength of the antenna 2 in working is lambda, m + n is less than or equal to 0.2 lambda, and the unit of each variable in the formula is meter. Optionally, m =0.1 λ, n =0.1 λ. The radiation frequency of the metal shell 1 is far away from the radiation frequency of the antenna 2, and the radiation interference of the radiation of the metal shell 1 to the antenna 2 is reduced, so that the energy loss of radio frequency radiation electromagnetic waves of the antenna 2 is reduced, and the radiation efficiency of the antenna 2 is improved.
Further, one end of the connecting structure 4 in the length direction may be connected to the radio frequency ground, the other end of the connecting structure 4 in the length direction is connected to the metal shell 1, and the extending length from one end of the connecting structure 4 in the length direction to the other end is n.
In the present invention, the circuit board 5 includes a dielectric substrate 53 and a plurality of metal layers, the dielectric substrate 53 is used to separate adjacent metal layers, and the plurality of metal layers include a metal layer used as a radio frequency ground.
Fig. 3 isbase:Sub>A partial cross-sectional viewbase:Sub>A-base:Sub>A of fig. 1 of the present invention.
As shown in fig. 3, the circuit board 5 includes five metal layers, which are a first metal layer 521, a second metal layer 522, a third metal layer 523, a fourth metal layer 524, and a fifth metal layer 525, respectively. The circuit board 5 further includes a dielectric substrate 53 disposed between adjacent metal layers, in an embodiment, the dielectric substrate 53 includes an FR4 board. The antenna 2 is connected to the first metal layer 521, and the auxiliary structure 51 and the first metal layer 521 are located on the same dielectric substrate. The rf ground includes a dielectric substrate located between the second metal layer 522 and the conductive via 511, the conductive via 511 is disposed between the first metal layer 521 and the second metal layer 522, the auxiliary structure 51 is connected to the second metal layer 522 through the conductive via 511, the auxiliary structure 51 facilitates the connection between the connection structure 4 and the circuit board 5, and avoids the first metal layer 521 and the rf ground from conflicting and interfering in layout. Those skilled in the art can design the circuit of the first metal layer 521, the second metal layer 522, the third metal layer 523, the fourth metal layer 524 and the fifth metal layer 525 according to the design requirement.
In some embodiments, the rf ground may be a top layer or a bottom layer in a multilayer metal layer.
In some embodiments, when the circuit board 5 includes only two metal layers, one of the two metal layers may serve as a radio frequency ground, the connection structure 4 may be directly connected to the radio frequency ground, and the other metal layer may serve as a radio frequency circuit layer and be connected to the antenna 2, so that the size of the circuit board 5 is small, which may reduce the size of the implantable medical device.
In the present invention, the connection structure 4 may be a circuit comprising at least one of a resistor, a capacitor and an inductor, the circuit having a low impedance characteristic in an operating frequency band of the antenna 2 (impedance is defined as Z = R + jX, where R is the real part of the impedance and X is the imaginary part of the impedance). In the operating frequency range of the antenna 2, the real part R of the impedance needs to be less than 20 Ω and the absolute value of the imaginary part X needs to be less than 20 Ω. The electromagnetic characteristics of the metal shell 1 are changed by adjusting the devices in the circuit, so that the effect of adjusting the radiation frequency of the metal shell 1 is achieved.
The connection structure 4 may also be an electrical conductor, the connection structure 4 being connected on one side to the auxiliary structure 51 and on the other side to a connection point of the metal shell 1 near the antenna hole 6. Preferably, the connecting structure 4 is connected with the metal shell 1 by laser welding, and the connecting structure 4 is welded with the auxiliary structure 51 by electric soldering. The connecting structure 4 can be in a strip shape or a column shape, the extending path length of the connecting structure 4 between the connecting point and the radio frequency ground is n, the length of the connecting structure 4 needs to be as short as possible, n can be limited to be less than or equal to 0.1 lambda, the internal space layout of the metal shell 1 can be optimized, the phenomenon that the occupied space of the connecting structure 4 is too large to influence the arrangement of other components is avoided, the electromagnetic characteristic of the metal shell 1 can be adjusted, the radiation frequency of the metal shell 1 is changed, the loss of the radio frequency radiation electromagnetic wave energy of the metal shell 1 to the antenna 2 is reduced, and the radiation efficiency of the antenna 2 is improved.
In the present invention, the metal case 1 has a first side wall 11 facing the board surface of the circuit board 5 and a second side wall 12 adjacent to the first side wall 11. In the example of fig. 1-8, the antenna aperture 6 is provided in the second side wall 12.
Fig. 4 is a schematic perspective view of an implantable medical device according to an embodiment of the present invention.
As shown in fig. 1 and 4, the implantable medical device further comprises a cap 3 disposed outside the second sidewall 12, the cap 3 having a receiving cavity. The top cover 3 is arranged on one side of the metal shell 1 with the antenna hole 6, and the antenna 2 is partially arranged in the accommodating cavity from the metal shell 1 through the antenna hole 6.
Fig. 5 is a schematic view of an implantable medical device according to a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that: the antenna hole 6 is provided with connection structures 4 on both sides.
As shown in fig. 5, the implantable medical device is provided with two connecting structures 4, the connecting structures 4 are respectively arranged on the circuit boards at two sides of the antenna 2, and the metal shell 1 is respectively provided with grounding points at two opposite sides of the antenna 2, compared with embodiment 1, the current path is less by half of the perimeter of the antenna hole 6, so that the radiation frequency of the metal shell 1 is increased compared with that of embodiment one, the radiation frequency is farther away from the antenna 2, and the energy loss of the radiation electromagnetic wave of the antenna 2 by the metal shell 1 is smaller.
In some embodiments, the connection structure 4 is located as close as possible to the connection point of the antenna 2 to the circuit board 5, depending on the location of other devices within the metal housing 1. The position of the connection point also needs to satisfy the condition that the connection structure 4 adopts the shortest possible size, the value of m + n is reduced, the radiation frequency of the metal shell 1 is further increased, and the radiation frequency of the metal shell 1 is far away from the radiation frequency of the antenna 2.
Fig. 6 is a schematic diagram of an implantable medical device according to a third embodiment of the present invention, which is different from the first embodiment in that: the connection structure 4 is connected to the feed-through ring 61.
Referring to fig. 6, the metal case 1 is provided with an antenna hole 6, the metal case 1 includes a feed-through loop 61 installed in the antenna hole 6, and the antenna 2 passes through a loop hole of the feed-through loop 61. The connecting structure 4 is provided with one, one side of the connecting structure 4 is connected with a radio frequency ground, the other side of the connecting structure 4 is connected with the feed-through ring 61 and is connected with the metal shell 1 through the feed-through ring 61, at the moment, a connecting point is positioned on the feed-through ring 61, the interval between the connecting point and the antenna hole 6 is negligible, namely m =0, the length selection range of the connecting structure 4 is enlarged, the connecting structure 4 can be limited to meet the requirement of less than 0.2 lambda, the setting of the connecting structure 4 is simpler, and the length of the connecting structure 4 is not changed. Compared with the first embodiment, the radiation frequency of the metal shell 1 is slightly increased, and the energy loss of the radiation electromagnetic wave of the antenna 2 by the metal shell 1 is smaller.
Fig. 7 is a schematic view of an implantable medical device according to a fourth embodiment of the present invention. The difference between the fourth embodiment and the first embodiment is that: the antenna hole 6 is provided with connection structures 4 on both sides, the connection structures 4 being connected to the feedthrough loops 61.
As shown in fig. 7, two connection structures 4 are disposed on two sides of the antenna hole 6, and two connection structures 4, two auxiliary structures 51, and two conductive holes 511 are disposed respectively, compared with embodiment 1, two connection structures 4 are respectively connected to the feed-through loop 61, the interval between the connection point and the antenna hole 6 is negligible, the current flows from two sides of the antenna hole 6, the current flow path is less by half of the perimeter of the antenna hole, the current flow path on the metal shell 1 can be further reduced, and the radiation electromagnetic wave energy loss of the metal shell 1 to the antenna 2 is smaller.
Fig. 8 is a schematic view of an implantable medical device according to a fifth embodiment of the present invention. The difference between the fifth embodiment and the first embodiment is that: the two opposite ends of the antenna 2 are respectively connected with the circuit board 5, the number of the antenna holes 6 is two, and the two sides of each antenna hole 6 are provided with the connecting structures 4.
As shown in fig. 8, the second sidewall 12 of the metal shell 1 is provided with two antenna holes 6 at intervals, and the feed-through ring 61 is mounted on the antenna holes 6. The extension portions are provided with two extension portions which are distributed on two opposite sides of the main body portion, the extension portions extending into the metal shell 1 penetrate through the annular holes of the two feed-through rings 61, and the two extension portions are respectively connected with the circuit board 5.
Four connecting structures 4 are arranged in the metal shell 1 corresponding to the two antenna holes 6, and four conductive holes 511 and four auxiliary structures 51 are correspondingly arranged on the circuit board 5. Two sides of the extending part are respectively provided with a connecting structure 4, the connecting points are arranged on the metal shell 1, the connecting structures 4 are connected on the metal shell 1, and m + n is less than or equal to 0.2 lambda.
In the invention, one of the two extending parts of the antenna 2 can be used for feeding, the other one is used for grounding, and two connecting structures are correspondingly arranged on the peripheral sides of the two antenna holes 6 respectively, so that the energy loss of the radiated electromagnetic wave of the antenna 2 can be further reduced.
Fig. 9 is a schematic view of an implantable medical device according to a sixth embodiment of the present invention. The sixth embodiment differs from the fifth embodiment in that the connection point is provided on the feed-through ring 61.
As shown in fig. 9, four connecting structures 4 are connected to the feedthrough 61, the connecting structures 4 are connected to the metal case 1 through the feedthrough 61, the distance between the connecting points and the antenna hole 6 is negligible, i.e. m =0, the selectable length range of the connecting structures 4 is expanded, the structural layout in the metal case 1 is facilitated, and the flow path of current in the metal case 1 is significantly reduced.
Fig. 10 is a schematic view of an implantable medical device according to a seventh embodiment of the present invention.
As shown in fig. 10, the metal layer has five layers, adjacent metal layers are separated by a dielectric substrate, and the first side wall 11 of the metal shell 1 is provided with an antenna hole 6 on the surface facing the circuit board 5.
In some embodiments, the first sidewall 11 may also be provided with a plurality of antenna holes 6.
The feed-through loop 61 is installed in the antenna hole 6, the antenna 2 passes through the loop hole of the feed-through loop 61 and protrudes to the outside of the metal shell 1, the connecting structure 4 is connected with the second metal layer 522 through the auxiliary structure 51, the connecting structure 4 is arranged near the antenna 2, the connecting structure 4 extends from the circuit board 5 to the first side wall 11 of the metal shell 1, and the first side wall 11 is arranged near the antenna hole 6 to be grounded. The connecting structure 4 is connected to a connecting point on the first side wall 11 and satisfies that m + n is less than or equal to 0.2 lambda.
In some embodiments, two or more connection structures 4 may be disposed on the periphery of the connection point of the antenna 2 and the circuit board 5 as required. The material and the size of each connecting structure 4 can be selected to be the same according to actual production, and can also be different. The arrangement position of the connecting structure 4 can be freely selected on the premise of being close to the antenna 2, and the flexibility is high.
Fig. 11 is a comparison graph of the actual test results of the implantable medical device provided in the first embodiment of the present invention and the existing implantable medical device, in which a is an actual test curve of the existing implantable medical device without the connection structure 4, and b is an actual test curve of the implantable medical device provided in the first embodiment of the present invention with the connection structure 4. Compared with the existing implantable medical equipment, the implantable medical equipment provided by the embodiment of the invention has the advantages that the loss of the test link is reduced by more than 5dB within the frequency range of 2.4GHz-3GHz, which means that the gain in the test direction is increased by 5dB, and the implantable medical equipment provided by the embodiment of the invention is provided with the connecting structure 4, so that the signal loss of the metal shell 1 to the antenna 2 is effectively reduced, and the signal intensity of the equipment is improved.
Fig. 12 is a comparison graph of the antenna performance actual test effect of the first and second implantable medical devices according to the embodiment of the present invention and the existing medical device, and c is a test curve for setting two connection structures 4, as can be seen from fig. 12, the link loss of curve c is significantly reduced compared with curve b at 2.6GHz-3GHz, which further reduces the signal loss of the metal shell 1 to the antenna 2, and improves the signal strength of the device.
The invention provides an implantable medical device which can be a deep brain electrical stimulator, an implantable cortical brain stimulator, an implantable spinal cord electrical stimulator, an implantable sacral nerve electrical stimulator, an implantable vagus nerve electrical stimulator, an implantable cardiac pacemaker or an implantable drug infusion device and the like.
The implantable medical device comprises a metal housing 1, a circuit board 5, an antenna 2 and at least one connection structure 4. The metal case 1 accommodates a circuit board 5 and a connection structure 4, and a part of the antenna 2 is located inside the metal case 1 and connected to the circuit board 5. The two ends of the connecting structure 4 are respectively connected with the radio frequency ground of the circuit board 5 and the connecting points of the metal shell 1, so that the electromagnetic property of the metal shell 1 is changed to change the radiation frequency of the metal shell 1, the distance between the connecting points and the antenna hole 6 and the working wavelength lambda of the connecting structure 4 and the antenna 2 meet the condition that m + n is less than or equal to 0.2 lambda, the radiation frequency of the metal shell 1 is far away from the working frequency of the antenna 2, the radiation interference of the radiation of the metal shell 1 on the antenna 2 is reduced, the loss of the radiation electromagnetic wave energy of the antenna 2 by the metal shell 1 is reduced, and the radiation efficiency of the antenna 2 is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An implantable medical device, comprising:
the metal shell is provided with an antenna hole and a connecting point which is spaced from the antenna hole by m;
a circuit board disposed inside the metal case;
the antenna is partially extended into the metal shell from the antenna hole so as to be connected with the circuit board; and
at least one connection structure located inside the metal shell;
the connecting structure is connected with the connecting point and the radio frequency ground of the circuit board, the extending path length of the connecting structure between the connecting point and the radio frequency ground is n, the working wavelength of the antenna is lambda, and m + n is less than or equal to 0.2 lambda, so that the radiation frequency of the metal shell is far away from the working frequency of the antenna.
2. The implantable medical device of claim 1, wherein the connection structure is an electrical conductor or a circuit comprising at least one of a resistor, a capacitor, and an inductor.
3. The implantable medical device of claim 2, wherein the connection structure is an electrical circuit, and the real impedance part of the connection structure is less than 20 Ω and the imaginary impedance part has an absolute value of less than 20 Ω in the operating frequency band of the antenna.
4. The implantable medical device of claim 1, wherein the antenna comprises a main portion and an extension portion connected to each other, the main portion is located outside the metal shell, the metal shell is provided with a plurality of antenna holes, and the plurality of antenna holes are provided with the extension portions extending into the metal shell and connected to the circuit board.
5. The implantable medical device of claim 4, wherein the connecting structures are respectively disposed between the metal shell and the circuit board corresponding to a plurality of the antenna holes.
6. The implantable medical device of claim 1, wherein the circuit board is connected to the connecting structures on two sides of the antenna, and the metal shell is correspondingly provided with grounding points on two opposite sides of the antenna hole.
7. The implantable medical device of claim 1, wherein the metal housing comprises a feedthrough ring mounted to the antenna bore, the antenna passing through a ring bore of the feedthrough ring.
8. The implantable medical device of claim 7, wherein the connection point is provided at the feedthrough ring;
the connecting structure connects the feed-through ring and connects the metal shell through the feed-through ring.
9. The implantable medical device of claim 1, wherein the circuit board comprises a dielectric substrate and a plurality of metal layers, the dielectric substrate is used for separating adjacent metal layers, and the plurality of metal layers comprise a metal layer used as the radio frequency ground.
10. The implantable medical device of claim 1, wherein the metal shell has a first sidewall facing a board surface of the circuit board and a second sidewall adjacent to the first sidewall, the first sidewall or the second sidewall being provided with the antenna aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211355758.8A CN115954668A (en) | 2022-11-01 | 2022-11-01 | Implantable medical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211355758.8A CN115954668A (en) | 2022-11-01 | 2022-11-01 | Implantable medical device |
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| CN115954668A true CN115954668A (en) | 2023-04-11 |
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| CN202211355758.8A Pending CN115954668A (en) | 2022-11-01 | 2022-11-01 | Implantable medical device |
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