Electron beam radiotherapy beam needle and radiotherapy device

Abstract

The utility model discloses an electron beam radiotherapy beam needle comprising a transmission body, a first channel used for transmitting electron beams is arranged in the transmission body, one end portion of the first channel is an incident end portion, and the other end portion of the first channel is an emergent end portion; and the scatterer is arranged at the emergent end part of the first channel so as to block the electron beam, and the scatterer scatters the electron beam towards the direction of the region where the scatterer is located. The electron beam radiotherapy beam needle can concentrate electron beam energy near the area where the scatterer is located. The utility model discloses a radiotherapy device, which comprises the electron beam radiotherapy beam needle and a beam source, the beam source is used for providing electron beams, and the beam source is arranged at the incident end part of a transmission body. The radiation therapy device adopts the electron beam radiation therapy beam needle, and the radiation therapy device can realize radiation therapy with relatively concentrated electron beam energy.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an electron beam radiotherapy beam needle and radiotherapy device. Background Technology

[0002] Brachytherapy has evolved from early low-dose-rate (LDR) brachytherapy to high-dose-rate (HDR) brachytherapy, and has gradually introduced new technologies such as electronic brachytherapy (eBT). However, these treatment techniques mainly rely on X-rays or gamma rays, and use corresponding applicators (rectal cancer applicators, cervical cancer applicators, prostate cancer implantation needles) to control the dose distribution to the target area in the human body to kill the tumor. X-rays and gamma rays penetrate deeply, and existing radiotherapy equipment has poor conformity, thus causing unavoidable radiation damage to surrounding healthy tissues and producing toxic side effects. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide an electron beam radiotherapy beam needle, wherein a first channel is provided inside the transmission body for transmitting an electron beam, and a scatterer is provided at the exit end of the first channel to block the electron beam, and the scatterer scatters the electron beam toward the area where the scatterer is located, so that the electron beam radiotherapy beam needle can concentrate the electron beam energy to the vicinity of the area where the scatterer is located.

[0004] The second objective of this invention is to provide a radiotherapy device that can achieve radiotherapy with relatively concentrated electron beam energy.

[0005] One of the objectives of this utility model is achieved through the following technical solution:

[0006] An electron beam radiotherapy beam needle, comprising:

[0007] The transmission body has a first channel for transmitting an electron beam inside, with one end of the first channel being the incident end and the other end being the exit end.

[0008] The scatterer is positioned at the exit end of the first channel to block the electron beam, and the scatterer scatters the electron beam toward the region where the scatterer is located.

[0009] In some embodiments, both the first channel and the scatterer are linear, extending in the same direction and coaxially.

[0010] In some embodiments, the scatterer is made of a solid material with a density ρ of 0.8 g / cm³. 3 ≤ρ≤1.2g / cm 3 .

[0011] In some implementations, the length of the scatterer corresponds to the energy of the electron beam, wherein the length of the scatterer is L1 and the energy of the electron beam is E, L1 = 0.5E, where the unit of length is cm and the unit of energy of the electron beam is MeV.

[0012] In some embodiments, the transmitter is a cylindrical tubular structure, the scatterer is a cylindrical columnar structure, the outer diameter of the transmitter is Φ1, the inner diameter of the transmitter is Φ2, the diameter of the scatterer is Φ3, Φ1>Φ2, Φ1=Φ3, the value of Φ1 ranges from 1mm to 5mm, and the value of Φ2 ranges from 0.5mm to 4mm.

[0013] And / or, the length of the transmission body is L2, and the value of L2 ranges from 6cm to 20cm.

[0014] In some embodiments, the incident end of the first channel is located at one end of the transmission body, the incident end of the first channel has an opening, and a connector is provided on the transmission body near the incident end of the first channel.

[0015] The exit end of the first channel is located at the other end of the transmission body. The exit end of the first channel has an opening, or the transmission body is provided with a vacuum window at the exit end of the first channel.

[0016] The second objective of this utility model is achieved by the following technical solution:

[0017] A radiotherapy device includes an electron beam radiotherapy needle according to any one of the above, and further includes a beam source for providing an electron beam, the beam source being disposed at the incident end of the transmitter.

[0018] In some embodiments, the radiotherapy device further includes a protective body, which is a tubular structure. The protective body has at least one second channel inside for inserting an electron beam radiotherapy needle. One end of the second channel has an opening, and the other end of the second channel is closed. The protective body is fitted over the electron beam radiotherapy needle through its opening, and the protective body is movably connected to the electron beam radiotherapy needle through the second channel.

[0019] In some implementations, the protective body is an implantation needle, and a second channel is provided on the protective body;

[0020] The radiotherapy device also includes a guide plate, which is provided with multiple third channels for passing through electron beam radiotherapy needles. Both ends of the third channels have openings. The multiple third channels are arranged along the transverse and longitudinal directions. The guide plate is movably connected to the electron beam radiotherapy needles through the third channels.

[0021] The guide plate is equipped with a protective body at the third channel position. The second channel and the corresponding third channel are interconnected. The electron beam radiotherapy needle passes through the third channel and is inserted to different depths of the corresponding second channel.

[0022] In some embodiments, the protective body is an applicator, and the protective body is provided with multiple second channels. The second channels are provided at the center and the periphery of the protective body, and the electron beam radiotherapy beam needle is inserted into the second channels at different depths.

[0023] And / or, the protective body includes a first tube and a second tube that are interconnected, a second channel located at the center of the protective body extending from the first tube to the second tube, and a plurality of second channels located on the periphery of the protective body being disposed inside the second tube.

[0024] And / or, the outer diameter of the first tube is Φ4, the outer diameter of the second tube is Φ5, and Φ4 < Φ5;

[0025] And / or, both the first tube and the second tube are straight, extending in the same direction and coaxially arranged.

[0026] In summary, this utility model has the following technical effects:

[0027] 1. The electron beam radiotherapy beam needle of this utility model has a first channel inside the transmission body for transmitting electron beams, and a scatterer is provided at the exit end of the first channel to block the electron beam. The scatterer scatters the electron beam in the direction of the scatterer area, so that the electron beam radiotherapy beam needle can concentrate the electron beam energy in the vicinity of the scatterer area.

[0028] 2. The radiotherapy device in this utility model uses the above-mentioned electron beam radiotherapy beam needle, which can achieve radiotherapy with relatively concentrated electron beam energy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the external structure of an electron beam radiotherapy beam needle in Embodiment 1 of this utility model;

[0030] Figure 2 This is a schematic diagram of the internal structure of an electron beam radiotherapy beam needle according to Embodiment 1 of this utility model;

[0031] Figure 3 This is Embodiment 1 of the present utility model. Figure 2 A magnified view of a portion of the image;

[0032] Figure 4 This is a schematic diagram of the structure of a radiotherapy device according to Embodiment 2 of this utility model;

[0033] Figure 5 This is a schematic diagram showing the usage state of a radiotherapy device according to Embodiment 2 of this utility model;

[0034] Figure 6This is a first-view structural schematic diagram of a radiotherapy device according to Embodiment 3 of this utility model;

[0035] Figure 7 This is a second-view structural schematic diagram of a radiotherapy device according to Embodiment 3 of this utility model;

[0036] Figure 8 This is a schematic diagram showing the usage state of a radiotherapy device according to Embodiment 3 of this utility model;

[0037] Figure 9 This is a schematic diagram of the structure of a radiotherapy device according to Embodiment 4 of this utility model;

[0038] Figure 10 This is a schematic diagram showing the usage state of a radiotherapy device according to Embodiment 4 of this utility model;

[0039] Figure 11 This is a schematic diagram of the implantation needle in this utility model;

[0040] Figure 12 This is a schematic diagram of the applicator in this utility model;

[0041] Figure 13 This is a schematic diagram illustrating the radiotherapy effect of the present invention with a scattering body;

[0042] Figure 14 This is a schematic diagram illustrating the radiotherapy effect of the non-scattering body of this invention.

[0043] The meanings of the reference numerals in the attached figures are as follows:

[0044] 10. Transmitter; 20. First channel; 30. Scatterer; 40. Connector; 50. Vacuum window; 60. Beam source; 70. Insertion needle; 80. Second channel; 90. Guide plate; 100. Third channel; 110. Applicator; 111. First tube; 112. Second tube; a. Target area; b. Irradiated area of ​​electron beam passing through scatterer; c. Irradiated area of ​​electron beam not passing through scatterer. Detailed Implementation

[0045] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0046] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0048] Example 1

[0049] See Figures 1-3 , Figure 13 as well as Figure 14 This utility model discloses an electron beam radiotherapy beam needle, comprising: a transmission body 10, wherein the transmission body 10 has a first channel 20 for transmitting an electron beam, one end of the first channel 20 is an incident end, and the other end of the first channel 20 is an exit end; and a scatterer 30, wherein the scatterer 30 is disposed at the exit end of the first channel 20 to block the electron beam, and the scatterer 30 scatters the electron beam toward the area where the scatterer 30 is located.

[0050] The electron beam radiotherapy beam needle of this invention has a first channel 20 inside the transmission body 10 for transmitting electron beams. A scatterer 30 is provided at the exit end of the first channel 20 to block the electron beam. The scatterer 30 scatters the electron beam in the direction of the scatterer 30, so that the electron beam radiotherapy beam needle can concentrate the electron beam energy in the vicinity of the scatterer 30.

[0051] It should be noted that the interaction between an electron beam and an object can exhibit the following main mechanisms: 1) Ionization: The electron beam can transfer energy to atoms or molecules within the object, thereby initiating an ionization process. This interaction usually results in atoms or molecules losing electrons and forming ions. 2) Excitation: The electron beam can cause outer electrons of atoms to transition from the ground state to an excited state. When the electron returns from the high-energy state to the low-energy state, it releases photons. 3) Elastic scattering: Elastic scattering refers to the phenomenon where electrons do not lose energy when they collide with atomic nuclei or electrons in an object, but only change their direction of motion. 4) Bremsstrahlung: When an electron approaches a positively charged atomic nucleus, it is accelerated (or decelerated) by the influence of the nuclear electric field. This acceleration process causes changes in the electron's velocity, direction, or kinetic energy, and emits X-rays.

[0052] The interaction between electrons and atoms in the object causes the electron beam energy to continuously decrease and changes the electron beam trajectory. As a result, when the electron beam enters the interior of the scatterer 30, the electron beam energy continuously decreases, thus the scatterer 30 blocks the electron beam. Furthermore, the scatterer 30 can change the electron beam trajectory to scatter the electron beam. This electron beam radiotherapy beam needle can concentrate the electron beam energy near the area where the scatterer 30 is located to form irradiation, avoiding the electron beam from forming an irradiation range that continuously extends in the direction of emission from the transmitter 10 due to the lack of obstruction by the scatterer 30 and the scattering effect. Therefore, this electron beam radiotherapy beam needle can achieve more precise radiotherapy according to the target area, avoid the electron beam penetrating too deeply, reduce radiation damage to surrounding healthy tissues, and reduce toxic side effects.

[0053] In this embodiment of the utility model, both the first channel 20 and the scatterer 30 are linear, and the first channel 20 and the scatterer 30 extend in the same direction and are coaxial.

[0054] Since the electron beam moves in a straight line in an ideal environment without external force or medium, the first channel 20 is set as a straight line to reduce the influence of the transmission body 10 on the electron beam, reduce the energy reduction and change of the trajectory of the electron beam when it is transmitted in the first channel 20; since the scatterer 30 extends in the same direction and is coaxial with the first channel 20, when the diameter of the scatterer 30 is greater than or equal to the aperture of the first channel 20, the scatterer 30 can completely block the aperture of the first channel 20, so that the scatterer 30 can completely act on the electron beam and prevent the electron beam from escaping the effect of the scatterer 30.

[0055] In this embodiment of the invention, the scatterer 30 is made of a solid material, and the density of the scatterer 30 is ρ, 0.8 g / cm³. 3 ≤ρ≤1.2g / cm 3 .

[0056] See Figure 13 The electron beam enters the scatterer 30 with the above-mentioned density through the first channel 20. The electron beam loses energy and changes its trajectory, causing the electron beam to diffuse in the scatterer 30 and form a "scattering cloud" that is approximately spherical.

[0057] More specifically, the "scattering cloud" is a pear-shaped sphere, and the width of the "scattering cloud" is close to the length of the scatterer 30.

[0058] Specifically, the aforementioned fixing materials can be acrylic, plastic, rubber, or other similar materials.

[0059] In this embodiment of the invention, the length of the scatterer 30 corresponds to the energy of the electron beam, wherein the length of the scatterer 30 is L1, the energy of the electron beam is E, L1 = 0.5E, and the unit of length is cm, and the unit of energy of the electron beam is MeV.

[0060] It should be noted that the energy of the electron beam mentioned above refers to the average energy of all electrons in a single pulse electron beam.

[0061] It should be noted that when the electron beam reaches the beginning of the scatterer 30, the electron beam energy begins to decrease and the electron beam trajectory begins to change. When the electron beam reaches the end of the scatterer 30, the electron beam energy is reduced to 0. In other words, the length of the aforementioned "scattering cloud" is equal to the length of the scatterer 30.

[0062] Thus, the electron beam passes through the scatterer and forms a "scattering cloud" with a width close to and a length equal to that of the scatterer 30. In other words, the scatterer 30 is located in the area of ​​the "scattering cloud", meaning that the energy of the electron beam is concentrated near the area of ​​the scatterer 30. By simply aligning the scatterer 30 with the target area, relatively precise radiotherapy can be achieved.

[0063] See Figure 14 When the scatterer 30 is not provided at the emitting end of the transmitter 10, the electron beam will only be affected by the air. The electron beam energy loss is small and the scattering is small. The energy of the electron beam cannot be concentrated in the target area. After the electron beam passes through the transmitter 10, it continues to extend along the emission direction of the transmitter 10, resulting in the electron beam penetrating deeper and causing unavoidable radiation damage to the surrounding healthy tissue, producing toxic side effects.

[0064] Specifically, the transporter 10 is made of metal, such as titanium, stainless steel, copper, tungsten, etc.

[0065] It should be noted that in some applications, the first channel 20 of the transporter 10 can be evacuated, thus forming a vacuum channel. When the electron beam is transported within the vacuum channel formed by the first channel 20, collisions between electrons and gas molecules are avoided, thereby preventing electron energy loss and scattering, and also preventing ionization and discharge phenomena. Of course, in some applications, the first channel 20 can also be filled with a low-density gas, such as hydrogen and / or helium, because under the same gas pressure, the mass of hydrogen molecules (H2) and helium molecules (He) is much smaller than that of nitrogen (N2) or oxygen (O2), resulting in less energy loss and weaker scattering effect when electrons collide with hydrogen molecules and / or helium.

[0066] In this embodiment of the utility model, the transmitter 10 is a cylindrical tubular structure, the scatterer 30 is a cylindrical columnar structure, the outer diameter of the transmitter 10 is Φ1, the inner diameter of the transmitter 10 is Φ2, the diameter of the scatterer 30 is Φ3, Φ1>Φ2, Φ1=Φ3, the value range of Φ1 is 1mm-5mm, and the value range of Φ2 is 0.5mm-4mm.

[0067] In this embodiment of the utility model, the length of the transmission body 10 is L2, and the value of L2 ranges from 6cm to 20cm.

[0068] In this embodiment of the present invention, the incident end of the first channel 20 is located at one end of the transmission body 10, the incident end of the first channel 20 has an opening, and a connector 40 is provided on the transmission body 10 near the incident end of the first channel 20; the exit end of the first channel 20 is located at the other end of the transmission body 10, the exit end of the first channel 20 has an opening, or a vacuum window 50 is provided on the transmission body 10 at the exit end of the first channel 20.

[0069] In some applications, the thickness of the vacuum window 50 is 0.02mm-1mm, and the material is made of metal, such as titanium, stainless steel, copper, tungsten, etc.

[0070] It should be noted that when both the incident end and the exit end of the first channel 20 have openings, the first channel 20 is in a non-vacuum state, and low-density gases, such as hydrogen and / or helium, can be filled inside the first channel 20; see reference Figure 3 When the incident end of the first channel 20 has an opening and the transmission body 10 is provided with a vacuum window 50 at the exit end of the first channel 20, a vacuum seal can be achieved between the vacuum window 50 and the transmission body 10, so that the first channel 20 can be evacuated to form a vacuum channel, and the electron beam inside the first channel 20 can pass through the vacuum window 50 and enter the scatterer 30.

[0071] Specifically, the connector 40 and the transmitter 10 are integrally formed, or the connector 40 and the transmitter 10 are separately formed and then connected and fixed into one piece by welding, snap-fitting, bonding, screw locking, etc., so as to facilitate the use of the electron beam radiotherapy beam needle.

[0072] It should be noted that the electron beam radiotherapy beam needle can be assembled into a device for use, for example, the electron beam radiotherapy beam needle can be assembled into a beam source 60 for use.

[0073] Since the outer diameter Φ1 of the transmission body 10 ranges from 1.0mm to 5mm, the connecting body 40 can be used to increase the connecting surface of the electron beam radiotherapy beam needle, thereby facilitating the assembly of the electron beam radiotherapy beam needle; for example, the connecting body 40 can be a connecting flange with a protruding edge to increase the connecting surface of the electron beam radiotherapy beam needle.

[0074] Example 2

[0075] See Figures 4-5 This utility model discloses a radiotherapy device, including an electron beam radiotherapy needle as described above, and a beam source 60, which is used to provide an electron beam and is disposed at the incident end of the transmission body 10.

[0076] The radiotherapy device of this invention uses the aforementioned electron beam radiotherapy needle, which enables radiotherapy with relatively concentrated electron beam energy.

[0077] In this embodiment of the invention, the radiotherapy device further includes a protective body, which is a tubular structure. The interior of the protective body is provided with at least one second channel 80 for inserting an electron beam radiotherapy needle. One end of the second channel 80 has an opening, and the other end of the second channel 80 is closed. The protective body is fitted over the electron beam radiotherapy needle through its opening, and the protective body is movably connected to the electron beam radiotherapy needle through the second channel 80.

[0078] Specifically, the protective body and the electron beam radiotherapy needle are fitted with a gap, and the gap between the protective body and the electron beam radiotherapy needle is such that the electron beam radiotherapy needle can be inserted and removed.

[0079] It should be noted that the protective body is used to protect the electron beam radiotherapy beam needle and prevent backflow caused by damage at the connection between the transmitter 10 and the scatterer 30 during the use of the electron beam radiotherapy beam needle.

[0080] For example, when the electron beam radiotherapy beam needle is performing radiotherapy, if there is no protective body on the outside of the electron beam radiotherapy beam needle, and the connection between the transmission body 10 and the scatterer 30 is damaged, since the transmission body 10 has a first channel 20 inside, when the first channel 20 is a vacuum channel, human tissue in the radiotherapy area can easily be drawn back into the first channel 20, which is quite dangerous.

[0081] Specifically, see Figures 11-12The protective body is either the insertion needle 70 or the source device 110. The wall thickness of the protective body is 0.5mm-2mm. According to L1=0.5E, when E is 10MeV, L1 is 5cm. At this time, the electron beam forms a "scattering cloud" with a length of 5cm and a width of nearly 5cm at the scatterer 30. The protective body with a wall thickness of 0.5mm-2mm has a small and negligible effect on the reduction of the electron beam's energy and the change of its trajectory.

[0082] Example 3

[0083] See Figures 6-8 , Figure 11 In this embodiment of the invention, the protective body is an implantation needle 70, and a second channel 80 is provided on the protective body; the radiotherapy device also includes a guide plate 90, on which multiple third channels 100 for inserting electron beam radiotherapy needles are provided. Both ends of the third channels 100 have openings, and the multiple third channels 100 are arranged along the transverse and longitudinal directions. The guide plate 90 is movably connected to the electron beam radiotherapy needles through the third channels 100; the guide plate 90 is provided with a protective body at the position of the third channel 100, and the second channel 80 is interconnected with the corresponding third channel 100. The electron beam radiotherapy needle passes through the third channel 100 and is inserted to different depths of the corresponding second channel 80.

[0084] Because the guide plate 90 has a flat plate structure and is provided with multiple third channels 100, each of which can be used to insert an electron beam radiotherapy needle, it can be applied to large target areas on the human body surface, such as the prostate area. However, because the guide plate 90 has a flat plate structure, the length of the third channel 100 is relatively short, and the guide plate 90 cannot provide overall protection for the electron beam radiotherapy needle. In order to facilitate the use of the electron beam radiotherapy needle, an insertion needle 70 can be provided at the position of each third channel of the guide plate 90 to cooperate with the electron beam radiotherapy needle for insertion into the human target area.

[0085] The specific usage process of this radiotherapy device is as follows:

[0086] An electron beam radiotherapy needle is installed on the beam source 60. The electron beam radiotherapy needle passes through a third channel 100 of the guide plate 90 and is inserted into the second channel 80 of the corresponding implant needle 70. The beam source 60 is moved to drive the electron beam radiotherapy needle to different depths in the second channel 80, thereby releasing the dose at different depths in the human target area. After completing the radiotherapy of one implant needle 70, the electron beam radiotherapy needle is inserted into the corresponding implant needles 70 in other third channels 100 to complete the radiotherapy of the human target area in sequence.

[0087] Example 4

[0088] See Figures 9-10 , Figure 12 In this embodiment of the utility model, the protective body is an applicator 110, and the protective body is provided with a plurality of second channels 80. The center and the periphery of the protective body are provided with second channels 80, and the electron beam radiotherapy beam needle is inserted into the second channels 80 at different depths.

[0089] In this embodiment of the invention, the protective body includes a first tube 111 and a second tube 112 connected to each other. A second channel 80 located at the center of the protective body extends from the first tube 111 to the second tube 112. A plurality of second channels 80 located on the periphery of the protective body are disposed inside the second tube 112.

[0090] In this embodiment of the utility model, the outer diameter of the first tube 111 is Φ4, and the outer diameter of the second tube 112 is Φ5, where Φ4 < Φ5.

[0091] In this embodiment of the utility model, both the first tube 111 and the second tube 112 are straight, and the first tube 111 and the second tube 112 extend in the same direction and are coaxially arranged.

[0092] Because the applicator 110 has a tubular structure and is provided with multiple second channels 80, each second channel 80 can be used to insert an electron beam radiotherapy needle, which is suitable for large target areas located in natural cavities of the human body, such as the rectal region or cervical region. Furthermore, because the second channel 80 is relatively long and the applicator 110 can protect the electron beam radiotherapy needle, the electron beam radiotherapy needle can be directly inserted into the target area of ​​the human body through the second channel 80 without the need for the insertion needle 70.

[0093] The specific usage process of this radiotherapy device is as follows:

[0094] An electron beam radiotherapy needle is installed on the beam source 60, and the applicator 110 is inserted into the human target area. The beam source 60 is moved to drive the electron beam radiotherapy needle to different depths in the second channel 80, so that the dose can be released at different depths in the human target area. After completing the radiotherapy of one second channel 80, the electron beam radiotherapy needle is inserted into other second channels 80 to complete the radiotherapy of the human target area in sequence.

[0095] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An electron beam radiotherapy beam needle, characterized in that, include: The transmission body has a first channel for transmitting an electron beam inside, one end of the first channel is the incident end, and the other end of the first channel is the exit end; A scatterer is disposed at the exit end of the first channel to block the electron beam, and the scatterer scatters the electron beam toward the region where the scatterer is located.

2. The electron beam radiotherapy beam needle according to claim 1, characterized in that: Both the first channel and the scatterer are linear, and the first channel and the scatterer extend in the same direction and are coaxial.

3. The electron beam radiotherapy beam needle according to claim 1, characterized in that: The scatterer is made of a solid material and has a density of ρ = 0.8 g / cm³. 3 ≤ρ≤1.2g / cm 3 .

4. The electron beam radiotherapy beam needle according to claim 1, characterized in that: The length of the scatterer corresponds to the energy of the electron beam, wherein the length of the scatterer is L1, the energy of the electron beam is E, L1 = 0.5E, and the unit of length is cm, and the unit of energy of the electron beam is MeV.

5. The electron beam radiotherapy beam needle according to claim 1, characterized in that: The transmitting body is a cylindrical tubular structure, the scattering body is a cylindrical columnar structure, the outer diameter of the transmitting body is Φ1, the inner diameter of the transmitting body is Φ2, the diameter of the scattering body is Φ3, Φ1>Φ2, Φ1=Φ3, the value range of Φ1 is 1mm-5mm, and the value range of Φ2 is 0.5mm-4mm. And / or, the length of the transmission body is L2, and the value of L2 ranges from 6cm to 20cm.

6. The electron beam radiotherapy beam needle according to claim 1, characterized in that: The incident end of the first channel is located at one end of the transmission body, the incident end of the first channel has an opening, and a connector is provided on the transmission body near the incident end of the first channel. The exit end of the first channel is located at the other end of the transmission body, and the exit end of the first channel has an opening, or the transmission body is provided with a vacuum window at the exit end of the first channel.

7. A radiotherapy device, characterized in that, The device includes an electron beam radiotherapy beam needle as described in any one of claims 1-6, and further includes a beam source for providing an electron beam, the beam source being disposed at the incident end of the transmitter.

8. The radiotherapy device according to claim 7, characterized in that: The radiotherapy device also includes a protective body, which is a tubular structure. The interior of the protective body is provided with at least one second channel for passing through the electron beam radiotherapy needle. One end of the second channel has an opening, and the other end of the second channel is closed. The protective body is fitted over the outside of the electron beam radiotherapy needle through its opening, and the protective body is movably connected to the electron beam radiotherapy needle through the second channel.

9. The radiotherapy device according to claim 8, characterized in that: The protective body is an implantation needle, and a second channel is provided on the protective body; The radiotherapy device also includes a guide plate, which is provided with a plurality of third channels for passing through the electron beam radiotherapy needle. Each third channel has an opening at both ends. The plurality of third channels are arranged along the transverse and longitudinal directions. The guide plate is movably connected to the electron beam radiotherapy needle through the third channels. The guide plate is provided with the protective body at the third channel position. The second channel is interconnected with the corresponding third channel. The electron beam radiotherapy needle passes through the third channel and is inserted to different depths corresponding to the second channel.

10. The radiotherapy device according to claim 8, characterized in that: The protective body is an applicator, and the protective body is provided with multiple second channels. The second channels are provided at the center and the periphery of the protective body, and the electron beam radiotherapy beam needle is inserted into the second channels at different depths. And / or, the protective body includes a first tube and a second tube connected to each other, a second channel located at the center of the protective body extending from the first tube to the second tube, and a plurality of second channels located on the periphery of the protective body disposed inside the second tube; And / or, the outer diameter of the first tube is Φ4, the outer diameter of the second tube is Φ5, and Φ4 < Φ5; And / or, both the first tube and the second tube are straight, and the first tube and the second tube extend in the same direction and are coaxially arranged.

Images