A variable frequency radiator array structure

Abstract

The application discloses a variable frequency radiator array structure. The device comprises a plurality of low-frequency dipole antenna units with a working frequency lower than 433 MHz, which are arranged along an elliptical or quasi-elliptical track to form a radiator array. By independently regulating the amplitude (or power) and phase of the input signals of each antenna unit, the electromagnetic energy generated by the radiator array can be focused in a predetermined target area of deep tissues of a human body, and the size of the focus spot can be regulated by regulating the working frequency. A water bag filled with deionized water is installed on the inner side of the device, and the energy penetration efficiency of the array radiator is improved through impedance matching, while the body surface temperature is kept constant to prevent high-heat burns. The system can realize non-invasive and tunable deep targeted heating, and is suitable for medical fields such as tumor hyperthermia, and has the advantages of large penetration depth, accurate focusing and high safety.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a variable frequency radiator array structure. Background Technology

[0002] Microwave deep-targeted heating is a tumor treatment technique that uses low-frequency microwaves to generate a thermal effect in deep lesion tissues of the human body. Combining traditional radiotherapy and chemotherapy with microwave deep-targeted heating can effectively improve the sensitivity of radiotherapy and chemotherapy.

[0003] Currently, radiators used for heating deep human tissues typically employ low-frequency unit radiators, with approved operating frequency bands mainly at 915MHz and 433MHz. Their disadvantages include limited penetration depth (approximately 6cm for 915MHz radiators and approximately 7cm for 433MHz radiators), and the attenuation of radiated energy starting from the human epidermis, making it impossible to create a focusing effect in deep lesion areas of the human body.

[0004] Therefore, based on the need for targeted heating therapy of deep lesions in the human body, there is an urgent need to develop a low-frequency array radiator for precise targeted heating of deep lesions in the human body, to enhance the sensitivity of radiotherapy and chemotherapy, and improve the survival probability of patients. Summary of the Invention

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is to provide a frequency converter radiator array structure, comprising: An array radiator comprising multiple low-frequency dipole antenna elements arranged around an elliptical or quasi-elliptical trajectory, the low-frequency dipole antenna elements operating at frequencies below 433 MHz.

[0006] In this process, by modulating the amplitude (or power) and phase of the input signal of the low-frequency dipole antenna element, the electromagnetic energy generated by the array radiator is focused within a predetermined target area.

[0007] Furthermore, the low-frequency dipole antenna element operates in the frequency range of 70MHz to 125MHz.

[0008] Furthermore, the frequency converter array structure also includes an impedance matching medium disposed inside the radiator array, wherein the impedance matching medium is a water bladder filled with deionized water.

[0009] Furthermore, the water bladder is a biocompatible silicone film.

[0010] Furthermore, the frequency converter radiator array structure also includes a support, which is an elliptical or near-elliptical acrylic substrate, on which multiple low-frequency dipole antenna elements are designed at equal intervals.

[0011] Furthermore, the number of the plurality of low-frequency dipole antenna elements is eight, and they are arranged in an equally spaced manner.

[0012] Furthermore, by adjusting the frequency of the input signal of each of the low-frequency dipole antenna elements, the size of the focal spot for focusing electromagnetic energy within the predetermined target area can be adjusted.

[0013] To address the aforementioned technical problems, the present invention also proposes a deep-targeted heating system, comprising: The frequency converter radiator array structure described above; The signal generation and control unit is configured to provide independently controllable input signals to each low-frequency dipole antenna element in the frequency conversion radiator array structure to regulate at least one of the amplitude, phase, and frequency of the input signals.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: 1. Achieving precise targeted heating of deep lesions in the human body: Utilizing a low-frequency dipole antenna unit with an operating frequency below 433MHz (preferably 70-125MHz), the radiated electromagnetic waves have a large penetration depth in biological tissues, effectively reaching and acting on deep lesion areas. Through array layout and signal modulation, electromagnetic energy can be focused on a predetermined target area (the detected lesion tissue area), achieving targeted heating of deep tissues and overcoming the limitations of traditional single-radiator heating or invasive heating.

[0015] 2. Flexible and adjustable focusing position and focal spot size, highly adaptable: By independently controlling the amplitude and phase of the input signal to each antenna unit, the energy focus can be precisely guided to different coordinate positions within the body without moving the device. Furthermore, by adjusting the frequency of the input signal, the focal spot size can be further controlled, thus adapting to the treatment needs of lesions of different sizes and depths, achieving personalized treatment plans. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an array radiator structure according to the present invention. Figure 2 This is a schematic diagram of the deep-targeted heating array radiator and the human torso model described in this invention. Figure 3 This is a schematic diagram of the impedance matching medium described in this invention; Figure 4 This is a schematic diagram of the human torso model described in this invention; Figure 5 The reflection coefficient (preferably |S) of the excitation port network of the array radiator of the present invention. 11 |and|S 33 |) Curve graph; Figure 6 The electric field distribution diagram (90MHz) of the human torso model with the focal center set at (0,0) in this invention. Figure 7 The electric field distribution diagram (90MHz) of the human torso model with the focal center set at (5, 0) in this invention. Figure 8 The electric field distribution diagram (110MHz) of the human torso model with the focus center set at (5, 0) in this invention.

[0018] Explanation of icon numbers: 1. Low-frequency dipole antenna element; 2. Support frame; 3. Impedance matching medium; 4. Human torso model. Detailed Implementation

[0019] This invention proposes a variable frequency radiator array structure, designed for precise targeted heating of deep lesions in the human body, thereby enhancing the sensitivity to radiotherapy and chemotherapy.

[0020] The following will describe a frequency converter array structure proposed in this invention through specific embodiments: Example 1: In the technical solution of this embodiment, a frequency converter array structure, such as Figure 1 As shown, it includes: An array radiator comprising multiple low-frequency dipole antenna elements 1 arranged around an elliptical or quasi-elliptical trajectory, wherein the operating frequency of the low-frequency dipole antenna elements 1 is below 433MHz. In this process, by modulating the amplitude (or power) and phase of the input signal of each low-frequency dipole antenna element 1, the electromagnetic energy generated by the radiator array is focused within a predetermined target area.

[0021] Furthermore, the low-frequency dipole antenna element 1 operates in the frequency range of 70MHz to 125MHz.

[0022] Furthermore, the frequency converter array structure also includes an impedance matching medium 3 disposed inside the radiator array, and the impedance matching medium 3 contains a water bladder filled with deionized water.

[0023] Furthermore, the water bladder is a biocompatible silicone membrane.

[0024] Furthermore, the frequency converter array structure also includes a support 2, which is an elliptical or near-elliptical acrylic substrate, and multiple low-frequency dipole antenna elements 1 are designed on the support 2 in an equally spaced manner.

[0025] Furthermore, the number of multiple low-frequency dipole antenna elements 1 is eight, and they are arranged in an equally spaced manner.

[0026] Furthermore, by adjusting the frequency of the input signal of each low-frequency dipole antenna element 1, the size of the focal spot for focusing electromagnetic energy within the predetermined target area can be adjusted.

[0027] Example 2: To address the aforementioned technical problems, the present invention also proposes a deep-targeted heating system, comprising: The frequency converter array structure of Example 1; The signal generation and control unit is configured to provide independently controllable input signals to each low-frequency dipole antenna element 1 in the frequency converter radiator array structure to regulate at least one of the amplitude (or power), phase, and frequency of the input signal.

[0028] Example 3: A frequency-converting radiator array structure includes eight low-frequency dipole antenna elements 1, an elliptical support 2, and an impedance matching medium 3.

[0029] like Figure 1 As shown, the eight radiator elements are low-frequency dipole antennas operating in the 70-125MHz range, designed with equal spacing on the elliptical support 2. The impedance matching medium 3 (water bladder) is as follows... Figure 3 As shown, the human torso model 4 is as follows Figure 4 As shown.

[0030] Low-frequency dipole antenna excitation port reflection coefficient (preferred |S) 11 |and|S 33 |) Curve as Figure 5 As shown.

[0031] Impedance matching medium 3 is filled between the elliptical support 2 and the human torso model 4 for impedance matching and to keep the surface of the human torso model 4 at a constant temperature.

[0032] Human torso model 4 was used to simulate the targeted heating effect of array radiators on deep lesions in the human body.

[0033] The input signal amplitude (or power) and phase are controlled for the eight low-frequency dipole antenna elements 1 to focus the electromagnetic energy radiated by the array radiator at a predetermined position, thereby targeting and heating the deep lesions in the human body at different locations.

[0034] Preferably, the spacing between adjacent low-frequency dipole antenna elements 1 is 173 mm.

[0035] Preferably, the length of the low-frequency dipole antenna element 1 is 460 mm.

[0036] Preferably, the low-frequency dipole antenna element 1 is fed by a coaxial connector.

[0037] Preferably, the elliptical support 2 is an octahedral cylindrical structure with a height of 480 mm.

[0038] Preferably, the wall material of the elliptical support 2 is acrylic, with a dielectric constant of 2.6 and a loss tangent of 0.0009.

[0039] Preferably, the impedance matching medium 3 is a water bladder filled with deionized water, with a height of 480 mm.

[0040] Preferably, the human torso model 4 has an elliptical cross-section with a height of 480mm, a major axis of 315mm, and a minor axis of 230mm, which is used to simulate the targeted heating effect of the array radiator on deep lesions in the human body.

[0041] First, the 8-port array radiator and the empty water bag are fixed to the treatment platform. For example... Figure 2 As shown, the human torso model 4 is placed at the center of the array radiator, and deionized water is poured into the empty water bladder until the deionized water completely covers the human torso model 4. The 8-port array radiator is connected to the signal generation and control unit through a coaxial feed connector to complete the hardware setup.

[0042] The input signal frequency for the eight low-frequency dipole antenna elements 1 was set to 90MHz, and the focusing position was set to the coordinate center (0, 0) of the human torso model 4. The excitation signal power and phase distribution of the eight elements are shown in Table 1. Figure 6 The figure shows the electric field intensity distribution inside the human torso model 4, where the electric field energy is effectively focused to a predetermined location.

[0043] Table 1:

[0044] The input signal frequency for the eight low-frequency dipole antenna elements 1 was set to 90MHz, and the focusing position was set to the coordinate center (5, 0) of the human torso model 4. The input signal power and phase distribution of the eight element radiators are shown in Table 2. Figure 7 The diagram shows the electric field intensity distribution inside the human body model 4, where the electric field energy is effectively focused to a predetermined location.

[0045] Table 2:

[0046] The input signal frequency for the eight low-frequency dipole antenna elements 1 was set to 110MHz, and the focusing position was set to the coordinate center (5, 0) of the human torso model 4. The input signal power and phase distribution of the eight element radiators are shown in Table 3. Figure 8 The diagram shows the electric field intensity distribution inside the human body model 4, where the electric field energy is effectively focused to a predetermined location.

[0047] Table 3:

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Specific changes include: modifying the 8-channel array radiator to a radiator with other numbers of channels; combining and exciting radiators of adjacent channels, etc.

[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A frequency converter radiator array structure, characterized in that, include: A radiator array comprising multiple low-frequency dipole antenna elements arranged around an elliptical or quasi-elliptical trajectory, the low-frequency dipole antenna elements operating at frequencies below 433 MHz; In this process, by modulating the amplitude and phase of the input signals of each low-frequency dipole antenna element, the electromagnetic energy generated by the radiator array is focused within a predetermined target area.

2. The frequency converter array structure according to claim 1, characterized in that, The low-frequency dipole antenna element operates in the frequency range of 70MHz to 125MHz.

3. The frequency converter radiator array structure according to claim 1, characterized in that, It also includes an impedance matching medium disposed inside the radiator array, wherein the impedance matching medium is a water bladder filled with deionized water.

4. The frequency converter radiator array structure according to claim 3, characterized in that, The water bladder is a biocompatible silicone film.

5. The frequency converter array structure according to claim 1, characterized in that, It also includes a support, which is an elliptical or near-elliptical acrylic substrate, on which multiple low-frequency dipole antenna elements are designed in an equally spaced manner.

6. The frequency converter radiator array structure according to claim 5, characterized in that, The number of low-frequency dipole antenna elements is eight, and they are arranged at equal intervals.

7. The frequency converter array structure according to claim 1, characterized in that, By adjusting the frequency of the input signal of each of the low-frequency dipole antenna elements, the size of the focal spot for focusing electromagnetic energy within the predetermined target area can be adjusted.

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