CN116914448A - Circular array antenna system for whole body thermotherapy - Google Patents
Circular array antenna system for whole body thermotherapy Download PDFInfo
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- CN116914448A CN116914448A CN202310858413.2A CN202310858413A CN116914448A CN 116914448 A CN116914448 A CN 116914448A CN 202310858413 A CN202310858413 A CN 202310858413A CN 116914448 A CN116914448 A CN 116914448A
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- circular array
- array antenna
- whole body
- antenna system
- human body
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- 238000000015 thermotherapy Methods 0.000 title abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 230000005855 radiation Effects 0.000 claims description 27
- 206010020843 Hyperthermia Diseases 0.000 claims description 26
- 230000036031 hyperthermia Effects 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 abstract description 23
- 238000011282 treatment Methods 0.000 abstract description 12
- 210000001519 tissue Anatomy 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 206010028980 Neoplasm Diseases 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 210000004872 soft tissue Anatomy 0.000 abstract description 4
- 208000000094 Chronic Pain Diseases 0.000 abstract description 2
- 208000002193 Pain Diseases 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 201000010099 disease Diseases 0.000 abstract description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 6
- 238000002560 therapeutic procedure Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 206010027476 Metastases Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000030833 cell death Effects 0.000 description 1
- 238000002512 chemotherapy Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000663 muscle cell Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001959 radiotherapy Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 230000000451 tissue damage Effects 0.000 description 1
- 231100000827 tissue damage Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/02—Radiation therapy using microwaves
- A61N5/022—Apparatus adapted for a specific treatment
- A61N5/025—Warming the body, e.g. hyperthermia treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The invention provides a circular array antenna system for whole body thermotherapy, which comprises a circular array antenna and a human body model structure; the circular array antenna is of a cylindrical structure of an octagonal array formed by eight dielectric substrates, the human body model structure is placed in the middle of the circular array antenna, and a simulated model structure is constructed for obtaining the dielectric constant and loss of biological tissues by adopting a Cole-Cole model. The system is a design method which accords with the ISM frequency band and is used for whole body thermotherapy circular array antenna, and realizes that electric field energy is uniformly transmitted into a human body and acts with human soft tissues. Based on the high development of the present age, the treatment technique for the diseases is milder. The advantages of the thermotherapy are gradually highlighted, and the thermotherapy can be used as an auxiliary means for treating tumors and can be used for relieving daily chronic pain.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a circular array antenna system for whole-body thermal therapy.
Background
Because of the high development of the current age, the health is also valued. The treatment method for the diseases is milder, and the medical treatment also provides high-temperature therapy as auxiliary treatment of chemotherapy and radiotherapy, thereby being an effective method for treating tumors. Clinical application of hyperthermia in oncology involves raising the temperature of cancerous tissue to induce cell death without causing other hot spots in adjacent tissue. Microwave hyperthermia is a new method of treating cancer tumors and metastases. These minimal or non-invasive procedures allow surgery to be performed in difficult to access areas, whereas traditional treatments can only be accomplished with serious side effects. This approach has a shorter recovery time, which has led to an increasing acceptance of these treatments by the health care community. Therefore, the method can be applied to daily life besides treating tumors, and can be applied to soft tissues by the principle of the thermal effect generated by electromagnetic energy in human tissues so as to achieve the therapeutic effect. Such as for soft tissue treatment of injuries, relief of chronic pain, postoperative recovery and health care, etc.
Antennas are an important part of wireless systems, and wireless systems and devices based on the transfer of heat by electromagnetic waves are not separated from antennas. The antenna converts the guided wave on the transmission line into free space electromagnetic wave and concentrates the radiation energy to form directional radiation. Many authors have conducted theoretical and experimental studies on microwave hyperthermia devices. Several hyperthermia treatments have been studied, including local hyperthermia, superficial hyperthermia and deep hyperthermia, and array antennas of different structures, such as planar array antennas, waveguide arrays, annular arrays, etc. have also been studied.
Disclosure of Invention
The technical scheme is as follows: in order to solve the technical problems, the invention mainly provides a circular array antenna for whole body thermal therapy, which works in a medical wireless frequency band specified by the International Telecommunication Union (ITU) radio rule. The heat treatment mainly heats the whole body or local position through electromagnetic waves to act on the soft tissues so as to achieve the treatment effect. Therefore, the damage of local high temperature to normal tissues is avoided, and the uniform electric field energy distribution is required to be formed in human tissues.
Specifically, the circular array antenna for whole body thermotherapy provided by the invention accords with the frequency band required by medical treatment and keeps a stable working state, and comprises a circular array antenna and a human body model structure; the circular array antenna is a cylindrical structure of an octagonal array formed by eight dielectric substrates, the human body model structure is placed in the middle of the circular array antenna, and a simulated model structure with the same dielectric constant and loss tangent value is constructed for obtaining the dielectric constant and loss tangent of biological tissues by adopting a Cole-Cole model.
As an improvement, the metal radiation patch and the metal ground are also included; every two metal radiation patches are correspondingly arranged on the inner side of each dielectric substrate cylinder structure, and each metal radiation patch is of a rectangular structure; the metal ground is arranged on the outer side face of the cylinder structure of the dielectric substrate and used as a grounding end.
As an improvement, a coaxial feed is included, which is directly connected to the metallic radiating patch through a probe, capable of transmitting radio frequency energy from the coaxial line to the antenna port.
As an improvement, the metal ground is a copper patch, and sixteen metal radiation patches are arranged.
As an improvement, the distance between two adjacent metal radiation patches on the same dielectric substrate is 400mm plus or minus 10mm, and two slit grooves are formed in two long edges of each metal radiation patch.
As an improvement, the dielectric substrate is a rectangular epoxy resin material plate, and the epoxy resin material plate is a material for preparing a glass fiber reinforced phase.
As an improvement, the circular array antenna adopts coaxial feed of 50Ω±5Ω, and the output impedance is 50Ω±5Ω according to the proportion.
As an improvement, the circular array antenna works in an ISM frequency band, a human body model is placed in the circular array antenna, and the linear array reflection coefficient modulus of the human body model works at 168MHz of a required frequency band is lower than-10 dB.
The beneficial effects are that: the invention provides a circular array antenna for whole body heat treatment, which is designed to be smaller in size on the basis of meeting the frequency range required by medical microwave heat treatment work. When excited in phase with the same radiation, the electric field radiation direction of the array is towards the center of the circle of the circular array, and electric field energy can be converged at the human body model. By optimizing, it is possible to distribute the electric field energy uniformly at the phantom.
The design is surrounded by sixteen antenna elements in an octagonal array, and the antenna works in a medical open frequency band. To reduce the antenna size, the current flow path is increased by means of slots in the radiating patches of the antenna elements. By adding the simulated human body to simulate the whole body human body thermotherapy and by 360-degree omnibearing energy supply of the circular array, the occurrence of energy dead zones is avoided. By optimizing, uniform electric field energy can be obtained at the human body part, muscle cell energy is deeply balanced, and tissue damage is relieved.
Drawings
Fig. 1 is a schematic front view of the structure of one unit antenna in a circular array antenna for whole body hyperthermia according to the first embodiment of the invention.
Fig. 2 is a schematic side view of the structure of one unit antenna in the circular array antenna for whole body hyperthermia according to the first embodiment of the invention.
Fig. 3 is a three-dimensional schematic diagram of a circular array antenna structure for whole body hyperthermia according to a first embodiment of the invention.
Fig. 4 is a schematic side view of a circular array antenna structure for whole body hyperthermia according to the first embodiment of the invention.
Fig. 5 is a schematic diagram of S-parameters of an antenna according to a second embodiment of the invention.
Fig. 6 is an electric field energy distribution diagram of a circular array antenna according to the second embodiment of the present invention without adding a phantom.
Fig. 7 is an electric field energy distribution diagram when a circular array antenna is added to a human body model in the second embodiment of the present invention.
In the figure: a dielectric substrate 1, a metal radiation patch 2, a probe 3, a metal ground 4 and a human body model 5.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In a first aspect, a circular array antenna design method for whole body hyperthermia includes: the glass fiber reinforced plastic composite material consists of 8 rectangular dielectric substrates 1, and is of an octahedral array cylinder structure, wherein the dielectric substrates are made of epoxy resin plates, and the epoxy resin plates are made of glass fiber reinforced phase preparation materials, so that the processing cost is reduced. The upper surface of the dielectric substrate 1 is provided with a metal radiation patch 2, and the top patch is subjected to slotting treatment. The wireless frequency band required by medical treatment is lower, a mode of digging a groove on the radiation patch is adopted, the current flow path is increased, and the antenna is ensured to work on the basis of reducing the size.
Each of the 8 rectangular dielectric substrates is correspondingly stuck with two metal radiation patches 2, one surface of each dielectric substrate faces towards the center of the circle and is provided with a metal ground 4, and the whole surface of each dielectric substrate is covered with copper as the ground.
Preferably, the metal radiation patch is a rectangular patch, and two slit grooves are formed in two long edges, so that current flow paths are increased, and the resonant frequency band is lower. The size of the patch antenna unit is smaller than 1/4 working wavelength, so that the loss of the plate is reduced and the weight is lightened.
Each dielectric substrate is correspondingly stuck with two metal radiation patches 2, that is to say, the circular array antenna consists of 16 metal radiation patches, and a similar circular array antenna is formed by surrounding. Furthermore, sixteen units are arranged to adopt 50 omega + -5 omega coaxial feed, so that the feed can be conveniently controlled.
Preferably, the circular array antenna adopts 50 ohm + -5 ohm coaxial feed, the feed point can be selected at any position in the patch and the influence on the antenna radiation is avoided. The coaxial feed 3 comprises a coaxial line and a probe for transmitting radio frequency energy from the coaxial line to the antenna port, and is connected to the metallic radiating patch 2 via the probe, further proportioned to have a coaxial feed output impedance of 50Ω±5Ω.
Unlike conventional planar arrays, the present invention has sixteen patch antenna units in an octagonal array, with the radiating surface facing the center of the circle, and the antenna units radiating in-phase feed, with the antenna electric field energy concentrated to the human body model. The circular array antenna ensures no blind area for human body thermal therapy and uniform distribution of electric field energy.
In a second aspect, the present invention proposes a structure and optimization of a circular array antenna for whole body hyperthermia, mainly comprising two parts, the circular array antenna being surrounded by 8 faces to form a right 8-face barrel-shaped structure, 2 radiating patches on each face, a circular array surrounded by 16 units as shown in fig. 3, and a mannequin for testing the authenticity of the actual parameters of the circular antenna for whole body hyperthermia.
By using the Cole-Cole model to obtain the dielectric constant and loss of the biological tissue of more detailed information, a real humanoid model is established. Under the condition of putting a real and uniform human body model, the circular array antenna still works in an ISM frequency band and forms uniform electric field energy at the human body model.
Preferably, the Cole-Cole model is used to obtain more detailed information on the dielectric constant and loss of the biological tissue, and a real human model is built.
Further, a uniform phantom having a radius of 150.+ -.10 mm and a length of 1000.+ -.20 mm was constructed, which had a dielectric constant of 47.08.+ -. 0.20 and a loss tangent of 0.7566.+ -. 0.0023.
Preferably, the circular array antenna operates in the ISM band, with the phantom placed in the tank, and still operates at the desired band, i.e., 168MHz, with S11 below-10 dB.
Preferably, 16 units are excited simultaneously, so that same-radiation in-phase feed is ensured, and the radiation of the array is concentrated towards the center of a circle and towards the middle human body model. By optimizing, the radiant electric field energy at the human body model is uniformly distributed.
Example 1
As shown in fig. 1 to 4, a circular array antenna for whole body hyperthermia, comprising: the dielectric substrate 1, wherein the dielectric substrate 1 of 8 antennas can be enclosed into an octagonal array, and the middle position is the mannequin 5.
The dielectric substrate 1 is a dielectric substrate of an antenna unit, the surface of the dielectric substrate is provided with a square metal patch 2 with a slit groove, the bottom of the dielectric substrate is provided with a metal ground 4, and a coaxial feed probe 3.
The phantom 5 is a uniform medium placed in the middle of the circular array, and the structure is optimized so that the antenna radiation electric field energy is uniformly distributed at the phantom.
Example two
The invention provides a circular array antenna design for whole body thermotherapy, comprising: the thermal therapy of the human body model is realized by exciting all metal radiation patches, namely 16 units, on each dielectric substrate 1, and the S11 is ensured to be smaller than-10 dB when the human body model exists in the circular array antenna.
In a circular array antenna for whole body hyperthermia as shown in fig. 5, the antenna units are less than-10 dB at S11 of 168 MHz.
As shown in fig. 6, a circular array antenna for whole body hyperthermia has an electric field energy distribution generated by the cavity at 168 MHz.
As shown in fig. 7, the circular array antenna for whole body thermotherapy has the electric field energy distribution generated by the human body model cavity at 168MHz, and the electric field energy uniformity at the human body model is obvious.
As can be seen from the circular array antenna reflection coefficient mode in fig. 5, the antenna operates at 168MHz, which is located in the ISM band; as can be seen from fig. 6, when the circular array antenna is in idle load, the radiated electric field has strong resonance in the cavity, resulting in uneven electric field distribution, and larger electric field value near the patch unit; as can be seen from fig. 7, when the mannequin is loaded, the electric field radiated by the circular array antenna is absorbed by the human body, the resonance of the electric field in the cavity is weakened, the radiated electric field antenna is smaller nearby, and the radiated electric field antenna is distributed more uniformly in the human body, which is beneficial to realizing omnidirectional uniform heating of the human body.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A circular array antenna system for whole body hyperthermia, characterized by: comprises a circular array antenna and a human body model structure; the circular array antenna is of a cylindrical structure of an octagonal array formed by eight dielectric substrates (1), and the human body model (5) is arranged in the middle of the circular array antenna, so that a simulated model structure with the same dielectric constant and loss tangent value is constructed for obtaining the dielectric constant and loss tangent of biological tissues by adopting a Cole-Cole model.
2. Circular array antenna system for whole body hyperthermia according to claim 1, characterized in that: the metal radiating patch (2) and the metal ground (4) are also included; every two metal radiation patches (2) are correspondingly arranged on the inner side of the cylinder structure of each dielectric substrate (1), and each metal radiation patch (2) is of a rectangular structure; the metal ground (4) is arranged on the outer side surface of the cylinder structure of the dielectric substrate (1) and is used as a grounding end.
3. Circular array antenna system for whole body hyperthermia according to claim 1, characterized in that: the coaxial feed is directly connected to the metal radiation patch (2) through the probe (3) and can transmit radio frequency energy from the coaxial line to the antenna port.
4. Circular array antenna system for whole body hyperthermia according to claim 1, characterized in that: the metal ground (4) is a copper patch, and sixteen metal radiation patches (2) are installed.
5. Circular array antenna system for whole body hyperthermia according to claim 1, characterized in that: the dielectric substrate (1) has a dielectric constant of 4.4 + -0.3 and a loss tangent of 0.02 + -0.01.
6. Circular array antenna system for whole body hyperthermia according to claim 2, characterized in that: the distance between two adjacent metal radiation patches (2) on the same dielectric substrate (1) is 400mm plus or minus 10mm, and two slit grooves are formed in two long edges of each metal radiation patch (2).
7. Circular array antenna system for whole body hyperthermia according to claim 1, characterized in that: the dielectric substrate (1) is a rectangular epoxy resin material plate, and the epoxy resin material plate is a material for preparing a glass fiber reinforced phase.
8. A circular array antenna system for whole body hyperthermia according to claim 1 or 3, characterized in that: the circular array antenna adopts coaxial feed of 50Ω+ -5Ω, and the input impedance is 50Ω+ -5Ω according to proportion.
9. Circular array antenna system for whole body hyperthermia according to claim 1, characterized in that: the circular array antenna works in ISM frequency band, a human body model (5) is placed in the circular array antenna, and the linear array reflection coefficient modulus of the human body model at 168MHz of the required frequency band is lower than-10 dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310858413.2A CN116914448A (en) | 2023-07-13 | 2023-07-13 | Circular array antenna system for whole body thermotherapy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310858413.2A CN116914448A (en) | 2023-07-13 | 2023-07-13 | Circular array antenna system for whole body thermotherapy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116914448A true CN116914448A (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310858413.2A Pending CN116914448A (en) | 2023-07-13 | 2023-07-13 | Circular array antenna system for whole body thermotherapy |
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| Country | Link |
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| CN (1) | CN116914448A (en) |
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2023
- 2023-07-13 CN CN202310858413.2A patent/CN116914448A/en active Pending
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