Double-half reverse symmetrical reentrant resonant cavity

Abstract

The utility model provides a double-half reverse symmetrical reentrant resonant cavity. The double-half reverse symmetrical reentrant resonant cavity comprises a left half cavity, a right half cavity, a coaxial feed port and a feed probe, the left half cavity and the right half cavity are in reverse symmetry; two groups of coaxial feed ports and feed probes are arranged, each group comprises a left half cavity and a right half cavity independently, one positive electrode feed port and one positive electrode feed probe are arranged on the innermost layer of the cavity, and one negative electrode feed port and one negative electrode feed probe are arranged on the outermost layer of the cavity. According to the resonant cavity, the two semicircular reentrant resonant cavities which are reversely symmetrical are combined into the complete annular resonant cavity, concentrated distribution of radiation field energy is achieved, the symmetrical structure of the resonant cavity not only improves the electromagnetic field distribution problem of a traditional resonant cavity, but also remarkably improves the energy utilization efficiency, and energy consumption of equipment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical instruments, and particularly relates to a double-half reverse symmetrical reentrant resonant cavity. BACKGROUND

[0002] Hyperthermia is a widely used treatment method in the medical field, which improves blood circulation, promotes metabolism, enhances immunity, relieves pain and other therapeutic effects by increasing the temperature of the human body or local tissue. In clinical applications such as malignant tumors, inflammatory diseases and joint lesions, hyperthermia is often used as an important auxiliary or main treatment method. The method of applying ultra-high frequency alternating current with a wavelength of 10m-1m and a frequency of 30MHz-300MHz to the human body for treatment and health care is called ultra-short wave therapy. Due to the high frequency of ultra-short waves, inductance is usually not suitable for treatment, and capacitance electrodes are more commonly used for treatment. The working principle of capacitance electrode ultra-short wave therapy is: high-frequency electromagnetic waves (such as radio frequency of 40.68MHz) are generated by a circuit, filtered, amplified, coupled and detected, and then output energy is radiated by a capacitance electrode to act on the human body.

[0003] The traditional microwave hyperthermia equipment has the following problems:

[0004] 1. Low energy utilization efficiency: part of the microwave energy is greatly lost in the transmission process, and cannot effectively reach the target tissue area, resulting in high energy consumption of the equipment.

[0005] 2. Non-uniform heating: the heating range of the traditional equipment is wide, and it is difficult to accurately control the heating area, which may cause local overheating or overcooling, increasing the side effects of treatment.

[0006] 3. High complexity of the equipment: the design structure of part of the equipment is complex, and the manufacturing cost is high, which is not conducive to popularization and application. INVENTION CONTENTS

[0007] Technical scheme: in order to solve the above technical problems, the utility model provides a double-half reverse symmetrical reentrant resonant cavity, which specifically comprises a left half cavity and a right half cavity, a coaxial feeding port and a feeding probe.

[0008] The left half cavity comprises a left cavity, a support and a left cover plate; the left cavity comprises a four-layer structure, comprising a left outer cylinder, a left middle cylinder, a left upper inner cylinder and a left lower inner cylinder; the left outer cylinder is a half-cylinder structure, and the left cover plate is installed on one side of the top; the left middle cylinder is connected to the left upper inner cylinder through the upper end of the support, and is connected to the left lower inner cylinder through the lower end of the support; the left upper inner cylinder and the left lower inner cylinder are not connected and are spaced apart.

[0009] The left half cavity and the right half cavity are in a reverse symmetrical relationship.

[0010] The coaxial feed port and the feed probe are installed in two groups, each group is independently left half cavity and right half cavity, and a positive feed port and a positive feed probe are installed in the innermost layer of the cavity, and a negative feed port and a negative feed probe are installed in the outermost layer of the cavity, and the electrical connection of the outer cylinder, the middle cylinder and the inner cylinder is realized through the feed probe.

[0011] As an improvement, the left cavity and the right cavity are cavity structures composed of metal plates; the support is a column or rod structure made of at least one of glass fiber reinforced plastic, polytetrafluoroethylene and nylon.

[0012] As an improvement, the input impedance of the coaxial feed port is 50Ω.

[0013] As an improvement, the left outer cylinder, the left middle cylinder, the left upper inner cylinder, the left lower inner cylinder and the right outer cylinder, the right middle cylinder, the right upper inner cylinder and the right lower inner cylinder are all hollow semicylindrical structures, the height of the left outer cylinder and the right outer cylinder is greater than the height of the left middle cylinder and the right middle cylinder, the height of the left middle cylinder is greater than the height of the left upper inner cylinder and the left lower inner cylinder, and the height of the right middle cylinder is greater than the height of the right upper inner cylinder and the right lower inner cylinder.

[0014] As an improvement, the bottom of the left middle cylinder and the right middle cylinder is independently located at a distance of 11.2-16.8mm above the bottom of the left lower inner cylinder and the right lower inner cylinder.

[0015] As an improvement, the distance between the left outer cylinder, the left middle cylinder, the left upper inner cylinder and the left lower inner cylinder, and the right outer cylinder, the right middle cylinder, the right upper inner cylinder and the right lower inner cylinder can be adjusted, and the interval can be set to 68.8-103.2mm.

[0016] The double-half reverse symmetrical reentrant resonant cavity is characterized in that the wall thickness of the left outer cylinder, the left middle cylinder, the left upper inner cylinder and the left lower inner cylinder, and the right outer cylinder, the right middle cylinder, the right upper inner cylinder and the right lower inner cylinder is the same, and the wall thickness is 0.5-3.0mm.

[0017] As an improvement, the radius of the signal transmission port surface of the coaxial feed port is 1.2-1.8mm, and the radius of the coaxial probe is 0.48-0.72mm, and the height is 81.6-123.4mm.

[0018] Compared with the prior art, the device has the following beneficial effects:

[0019] 1. The device is combined into a complete annular resonant cavity by two half-ring resonant cavities, which realizes the concentrated distribution of the radiation field energy, and the symmetrical structure not only improves the electromagnetic field distribution problem of the traditional resonant cavity, but also significantly improves the energy utilization efficiency and reduces the equipment energy consumption. At the same time, the radiation electric field generated by the half-ring resonant cavity belongs to a constrained electric field, which reduces the leakage of electromagnetic waves to the outside of the cavity, thereby significantly reducing the electromagnetic interference to other electronic devices around.

[0020] 2. The double-half reverse symmetrical reentrant resonant cavity is convenient for packaging and transportation, and reduces logistics cost. In addition, the modular design has low size requirement for the carrying channel (such as a door or a walkway), so that the double-half reverse symmetrical reentrant resonant cavity is more suitable for an environment with limited site condition, and installation convenience of the equipment is improved.

[0021] 3. The double-half reverse symmetrical reentrant resonant cavity is designed to divide the cavity into two symmetrical parts, form an electromagnetic field distribution of reverse resonance, realize uniform and stable heating effect in a target area, effectively constrain most of electric fields in the cavity, and ensure that most of electric fields directly act on a human body. The design greatly improves utilization efficiency of electromagnetic radiation energy, and optimizes a hyperthermia effect of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the resonant cavity body.

[0023] Figure 2 It is a disassembled schematic view of the left cavity and the right cavity.

[0024] Figure 3 It is a sectional view of the device along a coaxial feed point.

[0025] Figure 4 It is a distribution diagram of an electric field.

[0026] Figure 5 It is a distribution diagram of a magnetic field.

[0027] Figure 6 It is a return loss S of the double-half reverse symmetrical reentrant resonant cavity when working in an empty state. 11 It is a result schematic view.

[0028] Figure 7 It is a return loss S of the double-half reverse symmetrical reentrant resonant cavity when working in a state of adding a human body model. 11 It is a result schematic view.

[0029] In the figure, 1 is an outer cylinder, 11 is a left outer cylinder, 12 is a right outer cylinder, 2 is a middle cylinder, 21 is a left middle cylinder, 22 is a right middle cylinder, 3 is an inner cylinder, 31 is a left upper inner cylinder, 32 is a left lower inner cylinder, 33 is a right upper inner cylinder, 34 is a right lower inner cylinder, 4 is a resonant cavity body, 41 is a left cavity, 42 is a right cavity, 5 is a coaxial feed port, 6 is a left cover plate, 7 is a right cover plate, and 8 is a support column. DETAILED DESCRIPTION

[0030] Following specific examples illustrate embodiments of the present application, and other advantages and benefits of the present application will be readily understood by those skilled in the art upon consideration of the disclosure. The present application can be embodied in other different specific embodiments and applications, and various modifications and changes can be made to the details of the present application based on different views and applications without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0031] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] See Figure 1 As shown, the double half reverse symmetrical reentrant resonant cavity of the utility model, including the resonant cavity body 4 of reverse symmetry arrangement, is composed of left cavity 41, right cavity 42, the resonant cavity body 4 is arranged with semicircular structure from outside to inside in turn outer tube 1, middle tube 2 and inner tube 3, middle tube 2 is installed between outer tube 1 and inner tube 3, outer tube 1 and middle tube 2 are connected through left upper cover 6 and right lower cover 7, and middle tube 2 and inner tube 3 are connected through support 8.

[0034] Optionally, the inner tube 3 is two upper inner tubes 31 and lower inner tubes 32 not connected with each other. The wall thickness of the outer tube 1, the middle tube 2 and the inner tube 3 is the same, the inner diameter of the outer tube 1 is greater than the inner diameter of the middle tube 2, the inner diameter of the middle tube 2 is greater than the inner diameter of the inner tube 3, and the outer tube 1, the middle tube 2 and the inner tube 3 are all metal conductor materials.

[0035] The outer tube 1 includes left outer tube 11 and right outer tube 12, and the middle tube 2 includes left middle tube 21 and right middle tube 22.

[0036] In the embodiment, the energy radiator is a complete ring resonant cavity composed of two identical semi-ring resonant cavity bodies 4, the two semi-ring resonant cavity bodies 4 are separated from each other, and energy radiation is realized by using a coaxial feeding method.

[0037] Specifically, the coaxial feeding port is mainly composed of a signal transmission port surface with a radius of 1.2-1.8 mm and a coaxial probe with a radius of 0.48-0.72 mm and a height of 81.6-123.4 mm.

[0038] In the embodiment, the length of the outer cylinder 1 is greater than the length of the middle cylinder 2, and the length of the inner cylinder 3 is less than the length of the middle cylinder 2. Specifically, the middle cylinder 2 and the inner cylinder 3 form two poles of an open capacitor, and an electric field is generated between the middle cylinder 2 and the inner cylinder 3, and the direction of the electric field is from the inner cylinder 3 to the middle cylinder 2.

[0039] Embodiment 1

[0040] See Figure 1 As shown in the figure, it includes a left half cavity 41 and a right half cavity 42, a coaxial feeding port and a feeding probe;

[0041] The left half cavity 41 includes a left cavity, a support and a left cover plate; the left cavity includes a four-layer structure, including a left outer cylinder 11, a left middle cylinder 21, a left upper inner cylinder 31 and a left lower inner cylinder 32; the left outer cylinder 11 is a half-cylinder structure, a left cover plate 6 is installed on one side of the top, and a left middle cylinder 21 is installed on the other side of the left cover plate 6; the left middle cylinder 21 is connected to the left upper inner cylinder 31 through the upper end of the support 8 to the inner side, and is connected to the left lower inner cylinder 32 through the lower end of the support; the left upper inner cylinder 31 and the left lower inner cylinder 32 are spaced apart and not connected;

[0042] The left half cavity 41 and the right half cavity 42 are in a reverse symmetric relationship;

[0043] The coaxial feeding port 5 and the feeding probe are installed with two groups, each group is independently the left half cavity 41 and the right half cavity 42, and one positive electrode feeding port and positive electrode feeding probe are installed in the innermost layer of the cavity, and one negative electrode feeding port and negative electrode feeding probe are installed in the outermost layer of the cavity, and the electrical connection of the outer cylinder, the middle cylinder and the inner cylinder is realized through the feeding probe; the left half cavity 41 and the right half cavity 42 are in a reverse symmetric relationship;

[0044] The coaxial feeding port 5 and the feeding probe are installed with two groups, each group is independently the left half cavity 41 and the right half cavity 42, and one positive electrode feeding port and positive electrode feeding probe are installed in the innermost layer of the cavity, and one negative electrode feeding port and negative electrode feeding probe are installed in the outermost layer of the cavity, and the electrical connection of the outer cylinder 1, the middle cylinder 2 and the inner cylinder 3 is realized through the feeding probe.

[0045] The left cavity 41 and the right cavity 42 are cavity structures composed of metal plates; and the support 8 is a column or rod structure made of at least one of glass fiber reinforced plastic, polytetrafluoroethylene and nylon.

[0046] Specifically, the coaxial feed port input impedance is 50Ω.

[0047] As the specific embodiment of the utility model, the left outer cylinder 11, the left middle cylinder 21, the left upper inner cylinder 31, the left lower inner cylinder 32, the right outer cylinder 12, the right middle cylinder 22, the right upper inner cylinder 33 and the right lower inner cylinder 34 are all hollow semi-cylindrical structures, the height of the left outer cylinder 11 and the right outer cylinder 12 is greater than the height of the left middle cylinder 21 and the right middle cylinder 22, the height of the left middle cylinder 21 is greater than the height of the left upper inner cylinder 31 and the left lower inner cylinder 32, and the height of the right middle cylinder 22 is greater than the height of the right upper inner cylinder 33 and the right lower inner cylinder 34.

[0048] The bottom of the left middle cylinder 21 and the bottom of the right middle cylinder 22 are independently located at a distance of 11.2-16.8mm above the bottom of the left lower inner cylinder 32 and the bottom of the right lower inner cylinder 34.

[0049] Specifically, the distance between the left outer cylinder 11, the left middle cylinder 21, the left upper inner cylinder 31 and the left lower inner cylinder 32, and the distance between the right outer cylinder 12, the right middle cylinder 22, the right upper inner cylinder 33 and the right lower inner cylinder 34 can be adjusted, and the interval can be set to 68.8-103.2mm.

[0050] Specifically, the wall thickness of the left outer cylinder 11, the left middle cylinder 21, the left upper inner cylinder 31 and the left lower inner cylinder 32, and the wall thickness of the right outer cylinder 12, the right middle cylinder 22, the right upper inner cylinder 33 and the right lower inner cylinder 34 are the same, and the wall thickness is 0.5-3.0mm.

[0051] Further, the radius of the signal transmission port surface of the coaxial feed port 5 is 1.2-1.8mm, the coaxial probe is 0.48-0.72mm, and the height is 81.6-123.4mm.

[0052] Example 1

[0053] The working principle and use process of the patent are as follows: the semi-annular resonant cavity capacitive electrode is mainly composed of an open capacitive structure formed by a coaxial port 5 and an outer cylinder 1, a middle cylinder 2 and an inner cylinder 3. The inner conductor in the coaxial feeding port 5 is welded to the left and right middle cylinders, which is the positive electrode of the signal source, and the outer conductor is welded to the left and right outer cylinder walls, which is the negative electrode of the signal source. This feeding mode and structure ensure that the upper half of the left and right upper inner cylinder walls is connected to the positive electrode of the signal source, and the lower half of the left and right lower inner cylinder walls is connected to the negative electrode of the signal source through the left and right outer cylinder walls. Therefore, an electric field distribution is formed between the upper half of the left and right upper inner cylinder walls and the lower half of the left and right lower inner cylinder walls, so that the electric field energy is mainly concentrated in the cavity. At the same time, since the left and right middle cylinder walls are connected to the upper half of the left and right upper inner cylinder walls, the part of the left and right middle cylinder walls that coincides with the lower half of the left and right inner cylinder walls forms a capacitive structure, which can adjust the input impedance of the resonant cavity, so that the input impedance is close to 0. After filtering, amplifying and coupling the amplified signal, the power amplifier outputs the signal as radio frequency energy (the radio frequency is 40.68MHz).

[0054] Example 2

[0055] The human body is located in a double-half reverse symmetrical reentrant resonant cavity inner cylinder 3, and the resonant cavity can act on different positions of the human body, as shown in Figures 6-7 It can be seen that when the load is empty, the structure does not resonate and cannot play a role in resonant auxiliary treatment; but when the human body is loaded, the structure resonates and can work normally, and can play an auxiliary treatment effect on the human body.

[0056] The above-described embodiments only express several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A dual half reverse symmetric reentrant cavity characterized in that: The left half cavity and the right half cavity, the coaxial feeding port and the feeding probe; The left half cavity comprises a left cavity, a support and a left cover plate; the left cavity comprises a four-layer structure comprising a left outer cylinder, a left middle cylinder, a left upper inner cylinder and a left lower inner cylinder; the left outer cylinder is a half-cylinder structure, the left cover plate is mounted on one side of the top of the left outer cylinder, and the left middle cylinder is mounted on the other side of the left cover plate; the left middle cylinder is connected to the left upper inner cylinder through the upper end of the support and connected to the left lower inner cylinder through the lower end of the support; the left upper inner cylinder and the left lower inner cylinder are spaced apart and not connected; The left half cavity and the right half cavity are in a reverse symmetric relationship; The coaxial feeding port and the feeding probe are installed in two groups, each group independently in the left half cavity and the right half cavity, and one positive feeding port and one positive feeding probe are installed in the innermost layer of the cavity, and one negative feeding port and one negative feeding probe are installed in the outermost layer of the cavity, and the electrical connection of the outer cylinder, the middle cylinder and the inner cylinder is realized through the feeding probe.

2. The double half reverse symmetric reentrant cavity of claim 1, wherein: The left cavity and the right cavity are cavity structures composed of metal plates; the support is a column or rod structure made of at least one of glass fiber reinforced plastic, polytetrafluoroethylene and nylon.

3. The double half reverse symmetric reentrant cavity of claim 1, wherein: The input impedance of the coaxial feeding port is 50Ω.

4. The double half reverse symmetric reentrant cavity of claim 1, wherein: The left outer cylinder, the left middle cylinder, the left upper inner cylinder, the left lower inner cylinder, the right outer cylinder, the right middle cylinder, the right upper inner cylinder and the right lower inner cylinder are all hollow half-cylinder structures, the height of the left outer cylinder and the right outer cylinder is greater than the height of the left middle cylinder and the right middle cylinder, the height of the left middle cylinder is greater than the height of the left upper inner cylinder and the left lower inner cylinder, and the height of the right middle cylinder is greater than the height of the right upper inner cylinder and the right lower inner cylinder.

5. The double half resonator according to claim 4, characterized in that: The bottom of the left middle cylinder and the bottom of the right middle cylinder are independently located on the upper side of the bottom of the left lower inner cylinder and the bottom of the right lower inner cylinder by a distance of 11.2-16.8mm.

6. The double half resonator according to claim 1, wherein: The distance between the left outer cylinder, the left middle cylinder, the left upper inner cylinder and the left lower inner cylinder, and the distance between the right outer cylinder, the right middle cylinder, the right upper inner cylinder and the right lower inner cylinder can be adjusted, and the distance is 68.8-103.2mm.

7. The double half resonator according to claim 1, wherein: The wall thickness of the left outer cylinder, the left middle cylinder, the left upper inner cylinder and the left lower inner cylinder, and the wall thickness of the right outer cylinder, the right middle cylinder, the right upper inner cylinder and the right lower inner cylinder are the same, and the wall thickness is 0.5-3.0mm.

8. The double half resonator according to claim 1, wherein: The radius of the signal transmission port surface of the coaxial feeding port is 1.2-1.8mm, and the radius of the coaxial probe is 0.48-0.72mm, and the height is 81.6-123.4mm.

Images