CN115882206A

CN115882206A - Antenna and implantable medical device

Info

Publication number: CN115882206A
Application number: CN202211649033.XA
Authority: CN
Inventors: 施彬龙; 吕长泉; 宗升
Original assignee: Beijing Pins Medical Co Ltd
Current assignee: Beijing Pins Medical Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-03-31

Abstract

The embodiment of the invention provides an antenna and an implanted medical device. The main radiator and the first radiation branch are combined to form a first annular antenna, the main radiator and the second radiation branch are combined to form a second antenna surrounding the first antenna, the grounding part is connected to the main radiator, and the feeding part is connected to the first radiation branch. According to the antenna, through the relatively compact structure, the antenna performance is ensured, meanwhile, the size of the antenna is greatly reduced, so that the installation space of the antenna is effectively reduced, the miniaturization of the antenna application equipment is facilitated, the structure of the antenna is easy to process, and the production efficiency is relatively high.

Description

Antenna and implantable medical device

Technical Field

The invention relates to the field of medical equipment, in particular to an antenna and an implantable medical device.

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 Delivery Systems (DDS), etc., may implement data interaction with an extracorporeal device by way of wireless communication.

An antenna is one of the key components of the wireless communication system of an implanted medical device. Generally, an antenna applied to an implantable medical device is placed in a cap, but other components such as a wire connector are also present in the cap, so that a space for placing the antenna in the cap is limited. In addition, the trend of the prior art is toward miniaturization of the implantable medical device, the space of the top cover of the miniaturized implantable medical device is further reduced, and the space for arranging the antenna is further reduced.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an antenna and an implantable medical device, wherein the antenna has a smaller volume without changing the radiation efficiency of the antenna by providing two mutually surrounding antenna structures and providing a gap in the antenna structures.

In a first aspect, an embodiment of the present invention provides an antenna, where the antenna includes:

a main radiator;

the first radiation branch and the main radiator are surrounded to form a first antenna, one end of the first radiation branch is connected with the main radiator, and the other end of the first radiation branch extends towards the main radiator and is arranged at an interval with the radiation main body;

a second radiating branch surrounding the main radiator to form a second antenna, the second antenna surrounding the first antenna;

a ground part connected to the main radiator;

and a feeding portion connected to the first radiation branch.

Further, the main radiator comprises a first branch, a second branch and a third branch which are connected in sequence, the first branch and the third branch are arranged in parallel along a first direction, and the second branch is arranged along a second direction and is respectively connected with the end parts of the first branch and the third branch facing the same direction;

the first radiation branch comprises a fourth branch, a fifth branch and a sixth branch which are sequentially connected, one end of the fourth branch is connected to one side, away from the second branch, of the first branch, the fourth branch is arranged along the second direction, the fifth branch is arranged between the first branch and the third branch along the first direction, the second branch, the fourth branch and the sixth branch are arranged in parallel, and the free end of the sixth branch extends to the first branch;

the second radiation branch comprises a seventh branch knot and an eighth branch knot which are connected in sequence, the seventh branch knot is connected with the first branch knot and is far away from the end part on one side of the second branch knot and is arranged along the second direction, and the eighth branch knot is arranged along the first direction and extends towards the direction of the free end of the third branch knot.

Further, the length of the fourth branch is greater than that of the sixth branch, and a first gap is formed between the first end of the sixth branch and the second end of the first branch.

Further, the feeding portion is disposed at the sixth branch, and an extension path length of the sixth branch between the feeding portion and the first end is less than 1/30 of a dielectric wavelength of an operating frequency of the antenna.

Further, the grounding part is provided on the first branch or the second branch;

the extension path length of the radiation main body between the grounding part and the second end is less than 1/30 medium wavelength of the working frequency of the antenna.

Furthermore, the first end is provided with a groove, the second end is provided with a convex part matched with the groove in shape, and the first end and the second end are matched to form the first gap;

or the second end is provided with a groove, the first end is provided with a convex part matched with the groove in shape, and the first end and the second end are matched to form a first gap.

Furthermore, the third branch and the eighth branch are connected or arranged at intervals.

Furthermore, the third branch node is provided with a third end, and the third end is provided with one of a groove or a convex part;

the eighth branch knot is provided with a fourth end facing the third end, the fourth end is provided with the other of a groove or a convex part, and the third end and the fourth end are matched to form a second gap.

An implantable medical device, the implantable medical device comprising:

a circuit board including a feed structure and a short circuit structure;

in the antenna, the feeding portion of the antenna is connected to the feeding structure, and the grounding portion of the antenna is connected to the short-circuit structure;

the metal connecting piece is connected with the circuit board;

the shell is provided with an accommodating cavity, and the accommodating cavity is used for accommodating the circuit board;

the top cover is arranged on one side of the shell and provided with a containing groove, the containing groove is communicated with the containing cavity, and the containing groove contains the antenna and the metal connecting piece.

Further, the antenna is disposed on one side of the accommodating groove, and the metal connecting member extends from the other side of the accommodating groove to the antenna.

The embodiment of the invention provides an antenna and an implanted medical device. The main radiator and the first radiation branch combination form an annular first antenna, the main radiator and the second radiation branch combination form an annular second antenna surrounding the first antenna, the first antenna and the second antenna have a shared part on the main radiator, the antennas arranged through the two sleeves form a compact structure, the size of the antennas is greatly reduced while the performance of the antennas is guaranteed, the installation space of the antennas is effectively reduced, and the structure of the antennas is easy to process.

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 perspective view of an antenna according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of an antenna according to a second embodiment of the present invention;

fig. 3 is a schematic perspective view of an antenna according to a third embodiment of the present invention;

fig. 4 is a schematic perspective view of an implantable medical device provided by an embodiment of the invention;

FIG. 5 is a cross-sectional view of an implantable medical device provided by an embodiment of the present invention;

FIG. 6 is an enlarged view of portion A of an implantable medical device provided by an embodiment of the present invention;

FIG. 7 is a B-B cross-sectional view of an implantable medical device provided by an embodiment of the present invention;

fig. 8 is a flow chart of a method of making an antenna of an embodiment of the present invention;

fig. 9 is a flow chart of another method of making an antenna of an embodiment of the present invention;

fig. 10 is a simulation result of return loss of the antenna in a fat medium according to the first embodiment of the present invention;

fig. 11 is a simulation result of return loss of the antenna provided in the second embodiment of the present invention in a fat medium.

Description of reference numerals:

1-a main radiator; 11-a first branch; 12-second branch knot; 13-third branch;

2-a first radiating branch; 21-fourth branch; 22-fifth branch; 23-sixth branch; 24-a first gap; 241-a first end; 242-a second end;

3-a second radiating branch; 31-seventh minor matters; 32-eighth branch; 33-a second gap;

4-a ground part; 5-a feeding part;

6-a circuit board; 61-a metal layer; 62-a dielectric substrate;

7-metal connectors; 8-a shell; 81-through holes; 9-a top cover;

10-a matching circuit; 101-a signal transceiving means; 102-auxiliary connection means; 103-connecting hole.

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.

Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

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 to be construed broadly and encompass, for example, being fixedly connected, releasably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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.

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 perspective view of an antenna according to an embodiment of the present invention.

As shown in fig. 1, the antenna includes a main radiator 1, a first radiation branch 2, a second radiation branch 3, a ground portion 4, and a feeding portion 5. The main radiator 1 and the first radiation branch 2 are both in a U shape, and the second radiation branch 3 is in an L shape. The structure of the main radiator 1 and the first radiating branch 2 partially surround a first antenna forming a smaller loop, the main radiator 1 and the second radiating branch 3 partially surround a second antenna forming a larger loop, the first antenna and the second antenna have a common part, and the loop antenna structure can reduce the installation space.

Specifically, the main radiator 1 includes a first branch 11, a second branch 12, and a third branch 13 connected in sequence. The first branch 11 and the third branch 13 are arranged in parallel along a first direction (x-axis direction in the figure), the second branch 12 is perpendicular to the first branch 11 and the third branch 13, and the second branch 12 is respectively connected with the end parts of the first branch 11 and the third branch 13 on one side along a second direction (y-axis direction in the figure). The main radiator 1 is approximately U-shaped, and the first branch 11 is longer than the third branch 13. The first radiating branch 2 comprises a fourth branch 21, a fifth branch 22 and a sixth branch 23 connected in sequence. One end of the fourth branch 21 is connected to the side of the first branch 11 far away from the second branch 12, and the other end extends along the second direction. The fifth branch 22 is arranged between the first branch 11 and the third branch 13 in the first direction. The second branch node 12, the fourth branch node 21 and the sixth branch 23 are arranged in parallel along the second direction, and the free end of the sixth branch node 23 extends towards the first branch node 11 but is not connected with the first branch node 11. The first radiation branch 2 is in a U-shaped structure, and the fourth branch 21 is slightly longer than the sixth branch 23.

The fourth branch 21, the fifth branch 22, the sixth branch 23 and part of the first branch 11 enclose a first antenna with an opening between the first branch and the sixth branch 23.

The second radiation branch 3 is in an L shape, and the second radiation branch 3 includes a seventh branch 31 and an eighth branch 32 connected in sequence. The seventh branch 31 is connected to the end of the first branch 32 on the side away from the second branch 12. The eighth branch 32 is arranged in the first direction and extends in the direction of the free end of the third branch 13.

The second radiating branch 3 and the main radiator 1 surround the second antenna with a gap between the eighth branch 32 and the third branch 13. The part of the first branch 11 is used as a shared edge of the first antenna and the second antenna, the part of the second antenna surrounds the outer side of the first antenna, and the radiation efficiency of the antenna is not changed when the volume of the antenna is reduced.

The antenna further comprises a ground portion 4 and a feeding portion 5. The grounding part 4 is connected with the main radiator 1 and is connected with a radio frequency ground for an antenna structure. A feed 5 is connected to the first radiating branch 2 and feeds the antenna.

In some embodiments, the first direction and the second direction are not perpendicular to each other, thereby further reducing the volume of the antenna.

In some embodiments, the branches in the antenna may be straight or curved, and do not affect the radiation efficiency.

In this embodiment, a first gap 24 is provided between the sixth branch 23 and the first branch 11. Specifically, the sixth branch 23 has a first end 241, the first branch 11 has a second end 242 facing the first end 241, and the first gap 24 is formed between the first end 241 and the second end 242. The feeding part 5 is arranged on the sixth branch 23, and the extending path of the sixth branch 23 between the feeding part 5 and the first end 241 is less than 1/30 medium wavelength of the working frequency of the antenna. The grounding part 4 is arranged on the first branch section 11 or the second branch section 12, and the extending path of the second branch section 12 between the grounding part 4 and the second end 242 is less than 1/30 medium wavelength of the working frequency of the antenna. Since the grounding portion 4 and the feeding portion 5 are close in spatial distance, if the first gap 24 is not provided, the loop path between the grounding portion 4 and the feeding portion 5 is short, which may cause the antenna to deviate from the working frequency band and even cause short circuit. In addition, the current from the feeding part 5 to the grounding part 4 needs to pass through the sixth branch 23, the fifth branch 22, the fourth branch 21 and the first branch 11, so that the capacitance of the whole antenna is effectively increased, the impedance of the antenna is close to 50 Ω, the bandwidth of the antenna is expanded, and the performance of the antenna is improved. The first gap 24 is arranged between the feeding part 5 and the grounding part 4 in a smaller volume while ensuring the working frequency band of the antenna, so that the feeding part 5 is closer to the grounding part 4, and the structure that the grounding part 4 and the feeding part 5 are arranged on one side of the antenna is easier to install the antenna.

As shown in fig. 1, the ends of the first end 241 and the second end 242 are both rectangular, and the first gap 24 is a rectangular gap.

Fig. 2 is a schematic perspective view of an antenna according to a second embodiment of the present invention, in which a first end 241 has a groove, a second end 242 has a protruding portion matching with the groove, and the first end 241 and the second end 242 match to form a gap shaped like a Chinese character ji.

In some embodiments, the second end 242 has a groove, the first end 241 has a convex portion matching the shape of the groove, and the first end 241 and the second end 242 match to form a gap in the shape of a Chinese character 'ji'.

In the present embodiment, the sum of the lengths of the third branch 13 and the eighth branch 32 is smaller than the length of the first branch 11, so that a second gap 33 is formed between the third branch 13 and the eighth branch 32. The second gap 33 can increase the capacitance of the whole antenna, thereby expanding the bandwidth of the antenna and improving the performance of the antenna.

As shown in fig. 2, the third branch 13 has a third end facing the second gap 33, and the third end is provided with one of a groove or a protrusion;

the eighth branch 32 has a fourth end facing the second gap 33, the fourth end is provided with the other of the groove or the protrusion, and the third end and the fourth end cooperate to form a "few" shaped second gap 33.

In some embodiments, the third branch 13 and the eighth branch 32 may not have the second gap 33 therebetween, and the third branch 13 is connected to the eighth branch 32, so as to simplify the structure of the antenna, simplify the manufacturing process thereof, and improve the reliability thereof.

Fig. 3 is a schematic perspective view of an antenna according to a third embodiment of the present invention, in which the first gap 24 is a rectangular gap, and the second gap 33 is in a shape of a Chinese character ji. In some embodiments, the first gap 24 may be disposed in a zigzag shape, and the second gap 33 is a rectangular gap.

In addition, the first gap 24 and the second gap 33 may have other shapes, and the shape of the first gap 24 and the shape of the second gap 33 may be the same or different.

The embodiment of the invention also provides an implantable medical device which is provided with the antenna in the first embodiment, the second embodiment or the third embodiment. Fig. 4 is a schematic perspective view of an implantable medical device according to an embodiment of the present invention. The implantable medical device comprises a housing 8, a cap 9. The housing 8 has a receiving cavity in which the circuit board 6 is located. The top cover 9 is arranged on one side of the shell 8, and the shell 8 is provided with a through hole communicated with the containing groove of the top cover 9. The accommodating groove accommodates the antenna and the metal connecting piece 7, the antenna is arranged on one side of the accommodating groove, and the metal connecting piece 7 extends from the other side of the accommodating groove to the antenna. One end of the metal connecting piece 7 is connected with the circuit board 6, and the other end of the metal connecting piece 7 is connected with the top cover 9, so that the metal connecting piece is conducted with a treatment device which is connected with the outside of the top cover 9, and the treatment of the target position of a patient is realized. The feeding portion 5 of the antenna and the grounding portion 4 of the antenna are connected to the circuit board 6, respectively, to feed the antenna and provide a radio frequency ground.

In the present invention, the housing 8 is made of metal, preferably titanium alloy, and the top cover 9 is made of polymer plastic.

Fig. 5 is a cross-sectional view of an implantable medical device, which may be a stimulator, provided by an embodiment of the present invention.

The circuit board 6 comprises a matching circuit 10 and a signal transceiving means 101 arranged on the top layer. The matching circuit 10 is used for connecting with an antenna to realize impedance matching of the antenna, and the signal transceiver 101 is connected with the antenna to provide radio frequency signals for the antenna.

Fig. 6 is an enlarged view of a portion a of an implantable medical device provided by an embodiment of the present invention. The circuit board 6 further comprises auxiliary connection means 102 arranged on top. The auxiliary connecting device 102 is connected to the grounding portion 4, so that the grounding portion 4 is connected to the rf ground in the circuit board 6, and the auxiliary connecting device 102 can be disposed on the circuit board 6 by means of a metal coating. In some embodiments, when the rf ground is located on the top layer or the bottom layer of the circuit board, the auxiliary connection device is not disposed in the circuit board, and the ground of the antenna is directly connected to the rf ground.

Fig. 7 is a B-B cross-sectional view of an implantable medical device provided by an embodiment of the invention. The circuit board 6 includes a plurality of metal layers 61 arranged in parallel, and a dielectric substrate 62 separates adjacent metal layers 61. In the present embodiment, the dielectric substrate 62 includes an FR4 board. In order to facilitate the connection between the antenna ground and the circuit board 6, as shown in fig. 7, the metal layer on the second layer serves as a radio frequency ground, and the auxiliary connection device 102 is connected to the radio frequency ground through the connection hole 103, so that the antenna ground 4 is connected to the radio frequency ground. The other metal layers 61 are respectively other circuit design layers of the circuit board 6, and as shown in fig. 7, the housing 8 and the top cover 9 are communicated through a through hole 81. In some embodiments, a flange is disposed on the through hole 81.

Fig. 8 is a flow chart of a method for manufacturing an antenna according to an embodiment of the present invention. As shown in fig. 8, the method for manufacturing an antenna includes steps S10 to S30 as follows:

step S10, integrally processing a main radiator, a first radiation branch, a second radiation branch, a grounding part connected with the main radiator and a feeding part connected with the first radiation branch;

the integrated processing of the antenna structure can improve the processing quality and efficiency of the antenna, avoid the damage in the transportation process, reduce the mechanical equipment for production, reduce the failure rate of the equipment and improve the reliability of production by reducing the link of transportation.

Step S20, connecting the feeding part to the circuit board;

the feeding part is connected with the circuit board in an electric soldering iron welding mode.

Step S30, connecting the grounding part to a circuit board;

and the grounding part is connected with the circuit board by adopting an electric soldering iron welding mode.

Steps S20 and S30 in the manufacturing method shown in fig. 8 may be exchanged as necessary. The method has the advantages of simple and convenient steps, easy operation, and capability of reducing mechanical equipment used for production to the greatest extent, further reducing the failure rate of the equipment, improving the production efficiency and improving the production reliability.

Fig. 9 is a flow chart of another method for manufacturing an antenna according to an embodiment of the present invention. As shown in fig. 9, the method for manufacturing an antenna includes steps S100 to S500:

step S100, integrally processing a main radiator, a first radiation branch and a second radiation branch;

the integrated processing of the antenna structure can improve the processing quality and efficiency of the antenna, avoid damage in the transportation process, reduce mechanical equipment for production, reduce the failure rate of the equipment and improve the reliability of production by reducing the links of transportation.

Step S200, a feeding part is connected to the first radiation branch;

the feed portion is a feed wire penetrating through the flange and is connected with the first radiation branch in a laser welding mode.

Step S300, connecting a grounding part on the main radiator;

the grounding part is a feed wire penetrating through the flange and is connected with the main radiator in a laser welding mode.

Step S400, connecting the feeding part to the circuit board;

the feeding part is connected with the circuit board by adopting an electric soldering iron welding mode.

Step S500, connecting the grounding part to a circuit board;

the grounding part is connected with the circuit board by adopting an electric soldering iron welding mode.

In the manufacturing method shown in fig. 9, the sequence of S200 and S300, and the sequence of S400 and S500 may be changed as required, and the method may be applied to a plurality of implantable medical devices, and the corresponding feeding portion and grounding portion are selected according to implantable medical devices with different structures, and different connection modes between the antenna and the circuit board are designed, thereby having wider application occasions.

Fig. 10 is a simulation result of return loss of the antenna in the fat medium according to the first embodiment of the present invention. The antenna provided by the first embodiment is installed on an implanted medical device, and the implanted medical device has a bandwidth of 2.4GHz-3GHz when the return loss is below-10 dB in a frequency range of 2.4GHz-2.48GHz (the working frequency band of the antenna).

Fig. 11 is a simulation result of return loss of the antenna provided by the second embodiment of the present invention in a fat medium, and the antenna provided by the second embodiment is mounted on an implantable medical device, and the implantable medical device is in a frequency range of 2.4GHz-2.48GHz (working frequency band of the antenna). After the shape of the second gap is changed relative to the shape of the first gap, the bandwidth is 2.18GHz-2.78GHz when the return loss is less than-10 dB, and as can be seen from fig. 11, the valley of the return loss line is closer to the working frequency band of the antenna, so that the radiation performance of the antenna is further enhanced.

The embodiment of the invention provides an antenna and an implanted medical device. The main radiator and the first radiation branch comprise a plurality of branches which are combined to form a first annular antenna, the main radiator and the second radiation branch comprise a plurality of branches which are combined to form a second antenna surrounding the first antenna, the grounding part is connected to the main radiator, and the feeding part is connected to the first radiation branch. According to the embodiment of the invention, the compact structure ensures the performance of the antenna and greatly reduces the volume of the antenna, so that the installation space of the antenna is effectively reduced, and the structure of the antenna is easy to process.

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 to the present invention 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

1. An antenna, characterized in that the antenna comprises:

a main radiator;

a ground part connected to the main radiator;

and a feed section connected to the first radiating branch.

2. The antenna according to claim 1, wherein the main radiator includes a first branch, a second branch and a third branch connected in sequence, the first branch and the third branch are arranged in parallel along a first direction, the second branch is arranged along a second direction and is respectively connected to ends of the first branch and the third branch facing the same direction;

the second radiation branch is including the seventh minor matters and the eighth minor matters that connect gradually, the seventh minor matters is connected first minor matters is kept away from the tip of second minor matters one side sets up along the second direction, the eighth minor matters set up along the first direction and to third minor matters free end direction extends.

3. The antenna of claim 2, wherein the fourth stub has a length greater than a length of the sixth stub, and wherein a first gap is provided between the first end of the sixth stub and the second end of the first stub.

4. An antenna according to claim 3, wherein said feed is provided at said sixth branch, said sixth branch extending between said feed and said first end over a path length of less than 1/30 the wavelength of the medium at the operating frequency of the antenna.

5. The antenna according to claim 3, wherein the ground portion is provided on the first branch or the second branch;

6. The antenna of claim 3, wherein the first end has a recess and the second end has a protrusion matching the shape of the recess, the first end and the second end matching to form the first gap;

7. The antenna of claim 2, wherein the third branch is connected to or spaced apart from the eighth branch.

8. The antenna of claim 7, wherein the third stub has a third end, the third end being provided with one of a groove or a protrusion;

9. An implantable medical device, comprising:

a circuit board including a feed structure and a short circuit structure;

the antenna of any one of claims 1-8, a feed portion of the antenna being connected to the feed structure, a ground portion of the antenna being connected to the short circuit structure;

the metal connecting piece is connected with the circuit board;

10. The implantable medical device of claim 9, wherein the antenna is disposed on one side of the receiving slot, and the metal connector is disposed extending from the other side of the receiving slot to the antenna.