Electron beam radiotherapy radiation field stop block and use method thereof

Abstract

The invention relates to the technical field of medical equipment, and provides an electron beam radiotherapy radiation field stop block and a use method.The electron beam radiotherapy radiation field stop block comprises a rear end plate, connecting supports fixedly connected to the two side walls of the rear end plate, a front end plate fixedly connected to the ends, away from the rear end plate, of the connecting supports, a shielding mechanism arranged on the inner side walls of the connecting supports, and a fastening mechanism; the fastening mechanism is arranged on the outer side wall of the connecting support, the shielding mechanism comprises two outer side baffles, the two outer side baffles are arranged on the inner side wall of the connecting support, and the two outer side baffles are further connected between the front end plate and the rear end plate in a sliding mode; through the arrangement of the shielding mechanism, the sliding baffle can be conveniently and rapidly adjusted to be in a shape adaptive to a target region, and a doctor does not need to reserve a patient in advance, re-engrave the shape of the target region on the body of the patient or cut a plastic template in the shape of the target region according to a place needing irradiation; smelting low-melting-point lead, casting a lead mold, waiting for the lead mold to be cooled and trimmed, and the like.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, in particular to an electron beam radiotherapy field stopper and a use method thereof. Background Art

[0002] The electron beam radiotherapy field block is a device used to protect important tissues and organs in the field. Its main purpose is to change the regular field of view into an irregular field of view so that the projection of the field shape is consistent with the shape of the target area, which can more accurately irradiate the tumor tissue and reduce damage to the surrounding normal tissues.

[0003] In the prior art, most electron beam radiotherapy blocks are made of low-melting-point lead, which is composed of 50% bismuth, 26.7% lead, 10% cadmium, and 13.3% tin. The metal cadmium contained in it is highly toxic and can easily cause cancer in the human body. The lead vapor is also very harmful to humans.

[0004] The surface of the cast low-melting-point lead block is rough and soft. When it is placed in the electronic tube tray, or when several small pieces of low-melting-point lead blocks are used for more precise shielding, debris often falls off and sprinkles on the patient's body surface. The therapist's hands will also be stained with low-melting-point lead powder. If the patient has a large open wound, the harm is unimaginable;

[0005] In the prior art, most shielding methods for irregular target areas are to use low-melting-point lead that is melted and cast immediately, or to perform superimposed shielding, which is inconvenient and not environmentally friendly.

[0006] Therefore, those skilled in the art have proposed an electron beam radiotherapy field block and a method of use to solve the problems raised by the background art. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides an electron beam radiotherapy field block and a method of use, so as to solve the problems in the prior art that low-melting-point lead blocks are highly toxic and lead blocks are prone to produce debris that enter the human body, and that the blocking blocks are cast or superimposed when treating irregular target areas.

[0008] An electron beam radiotherapy field stopper comprises a rear end plate, two side walls of the rear end plate are fixedly connected to connecting brackets, and one end of the connecting bracket away from the rear end plate is fixedly connected to the front end plate;

[0009] A shielding mechanism, wherein the shielding mechanism is arranged on the inner side wall of the connecting bracket;

[0010] The fastening mechanism is arranged on the outer side wall of the connecting bracket.

[0011] Preferably, the shielding mechanism comprises an outer baffle plate, and the outer baffle plate is in the form of two inner side walls connected to the bracket, and the two outer baffle plates are also slidably connected between the front end plate and the rear end plate.

[0012] Preferably, a plurality of sliding baffles are slidably connected between the two outer baffles, and the ends of the plurality of sliding baffles and the plurality of outer baffles are fixedly connected with fixing bolts.

[0013] Preferably, the fastening mechanism comprises a connecting screw groove, the connecting screw groove is opened on the inner side wall of one of the connecting brackets, and the inner side wall of the connecting screw groove is threadedly connected with a fastening screw.

[0014] Preferably, a plurality of the sliding baffles are slidably connected between the front end plate and the rear end plate.

[0015] Preferably, the top ends of the rear end plate and the front end plate are fixedly connected with threaded sleeves, and the inner side walls of the threaded sleeves are threadedly connected with threaded rods.

[0016] Preferably, the outer side wall of the rear end plate is provided with a sliding mechanism, and the sliding mechanism includes an electron tube bottom plate, and the electron tube bottom plate is movably connected to the bottom end of the rear end plate, and the top of the electron tube bottom plate is fixedly connected to multiple support rods, and the tops of the multiple support rods are fixedly connected to top baffles, and the top of the electron tube bottom plate is fixedly connected to two connecting slide rails, and the two connecting slide rails and the rear end plate are slidingly connected, the limiting sleeve is fixedly connected to the top of the front end plate, and the through rod penetrates and is slidably connected to the inner side wall of the limiting sleeve.

[0017] 7. A method for using an electron beam radiotherapy field block, characterized in that it comprises the following steps:

[0018] S1. When performing radiotherapy on a patient, first select a light-limiting cylinder, place the prefabricated block in the light-limiting cylinder tray, and then place the shielding box consisting of the entire shielding mechanism, the fastening mechanism and the connecting bracket between the two connecting rails and above the prefabricated block;

[0019] S2. Depending on the shape and size of the patient's target area, light-limiting tubes of different sizes will be selected to connect with the linear accelerator. The prefabricated blocks placed in the light-limiting tube tray will be selected according to the size of the patient's target area. The model of the prefabricated block 25 can adapt to light-limiting tubes of specifications of 6cm×6cm, 10cm×10cm, 15cm×15cm, 20cm×20cm and 25cm×25cm. The selection of the light-limiting tube and the prefabricated block is based on the principle of the smallest model that can cover the target area.

[0020] S3, then rotate the threaded rod so that the threaded rod installs the two shielding boxes together, and adjust the spacing between the shielding mechanisms on both sides according to the width of the target area, and then push the fixing bolts so that the fixing bolts drive the sliding baffle to slide in the connecting bracket, and push multiple fixing bolts to slide and piece together into the shape of the patient's target area. For the area outside the target area, push the remaining sliding baffles on both sides that are not involved in shaping to make them completely closed, and then rotate the fastening mechanism to limit the shielding mechanism;

[0021] S4. During the first treatment of the patient, a transparent acrylic plate can be used to depict the shape of the target area on the patient, and key information such as the patient's name, treatment number, and model of the light-limiting tube and prefabricated block can be marked, and archived for multiple use. When in use, place the two shielding boxes on the acrylic plate, rotate the threaded rod according to the width of the target area, adjust the spacing between the shielding mechanisms on both sides, push out the shape of the sliding baffle according to the shape of the target area, and push the remaining sliding baffles that are not involved in the shaping of the area outside the target area to make them tightly closed and lock the fastening mechanism; during treatment, place it on the two connecting slide rails above the light-limiting tube tray and the prefabricated block, and cooperate with the light-limiting tube and the prefabricated block to give the patient precise treatment of the target area.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention can quickly and conveniently adjust the sliding baffle to the shape that adapts to the target area through the setting of the shielding mechanism. It is not necessary for the doctor to make an appointment with the patient in advance according to the place where the irradiation is required, to replicate the shape of the target area on the patient, to cut the plastic template of the target area shape, to melt low-melting point lead, to cast the lead mold, and to wait for the lead mold to cool and trim the lead mold, etc. A series of cumbersome and toxic processes, or to use small pieces of low-melting point lead blocks, unsafely stacked and shielded. When this technology is used, the length and width of the target area on the patient are measured, the most suitable light-limiting cylinder is selected, and then the most suitable prefabricated brass block is selected and placed in the light-limiting cylinder tray to complete the preliminary shielding, and the shielding mechanism of the light-limiting cylinder is selected to accurately shield the shape of the target area. Through the reasonable arrangement of the shape of the sliding baffle, the gap between the sliding baffles can be completely eliminated, avoiding the radiation from directly irradiating the normal skin through the gap during irradiation. In combination with the prefabricated block, the leakage of radiation is minimized to protect normal tissues. The most suitable light-limiting cylinder and prefabricated brass block refer to the smallest size model that can contain the target area.

[0024] 2. By setting the fastening mechanism, after the sliding baffle is adjusted to the shape of the target area, the sliding baffle can be locked and shaped to ensure that the end of the sliding baffle close to the target area is consistent with the shape of the target area.

[0025] 3. By replacing the outer baffle and the sliding baffle with brass, the damage to the human body caused by low-melting-point lead can be solved. Brass is cheap and has good adaptability. For each model of electronic light-limiting tube, several brass blocks of fixed size and shape are prefabricated for backup. Alternatively, tungsten copper, which has a higher density and is not expensive in my country, can be selected to replace low-melting-point lead. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is one of the three-dimensional schematic diagrams of the present invention;

[0027] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the middle shielding mechanism;

[0028] Figure 3 For the present invention Figure 1 A schematic diagram of the structure of the fastening mechanism;

[0029] Figure 4 For the present invention Figure 1 A schematic diagram of the cross-sectional structure of the bottom plate of the central electron tube;

[0030] Figure 5 For the present invention Figure 2 Schematic diagram of the structure of the fastening mechanism.

[0031] In the figure: 1, rear end plate; 11, connecting bracket; 12, front end plate; 13, outer baffle; 14, sliding baffle; 15, fixing bolt; 16, connecting screw groove; 17, fastening screw; 19, threaded sleeve; 20, threaded rod; 21, bottom plate of electronic tube; 22, support rod; 23, top baffle; 24, connecting slide rail; 25, prefabricated block. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] As attached Figure 1 To Attachment Figure 5 As shown:

[0034] Embodiment 1: The present invention provides an electron beam radiotherapy field block and a method of use, comprising a rear end plate 1, two side walls of the rear end plate 1 are fixedly connected to connecting brackets 11, and one end of the connecting bracket 11 away from the rear end plate 1 is fixedly connected to a front end plate 12;

[0035] A shielding mechanism, wherein the shielding mechanism is arranged on the inner side wall of the connecting bracket 11;

[0036] A fastening mechanism, wherein the fastening mechanism is arranged on the outer side wall of the connecting bracket 11, and the shielding mechanism includes an outer baffle plate 13, wherein the outer baffle plates 13 are two on the inner side wall of the connecting bracket 11, and the two outer baffle plates 13 are also slidably connected between the front end plate 12 and the rear end plate 1, and a plurality of sliding baffle plates 14 are slidably connected between the two outer baffle plates 13, and the ends of the plurality of sliding baffle plates 14 and the plurality of outer baffle plates 13 are fixedly connected with fixing bolts 15;

[0037] Specifically, by splicing the sliding baffles 14, the gaps between the sliding baffles 14 can be completely filled to prevent light from leaking out when the sliding baffles 14 are in use. Combined with the function of the rear end plate 1, the sliding baffles 14 can be limited to prevent the sliding baffles 14 from shaking when in use.

[0038] The fastening mechanism includes a connecting screw groove 16, which is opened on the inner side wall of one of the connecting brackets 11, and the inner side wall of the connecting screw groove 16 is threadedly connected with a fastening screw 17, and the plurality of sliding baffles 14 are slidably connected between the front end plate 12 and the rear end plate 1, and the top ends of the rear end plate 1 and the front end plate 12 are fixedly connected with a threaded sleeve 19, and the inner side wall of the threaded sleeve 19 is threadedly connected with a threaded rod 20;

[0039] Specifically, the distance between the two shielding mechanisms can be adjusted by setting the threaded rod 20 and the threaded sleeve 19. After the distance is adjusted, the shielding mechanism can be limited by the threaded rod 20 and the threaded sleeve 19 to avoid shaking after adjustment.

[0040] The outer side wall of the rear end plate 1 is provided with a sliding mechanism, and the sliding mechanism includes an electron tube bottom plate 21, and the electron tube bottom plate 21 is movably connected to the bottom end of the rear end plate 1, and the top of the electron tube bottom plate 21 is fixedly connected to a plurality of support rods 22, and the tops of the plurality of support rods 22 are fixedly connected to a top baffle 23, and the top of the electron tube bottom plate 21 is fixedly connected to two connecting slide rails 24, and the two connecting slide rails 24 are slidably connected to the rear end plate 1, and the limiting sleeve 26 is fixedly connected to the top of the front end plate 12, and the penetration rod 27 penetrates and is slidably connected to the inner side wall of the limiting sleeve 26;

[0041] Specifically, the connecting slide rail 24 can limit the two shielding mechanisms, ensuring that the two shielding mechanisms are in the same position and overlap with the prefabricated stopper 25 below, making it convenient to irradiate the target area.

[0042] As can be seen from the above, when one side of the target area needs to be shielded, firstly, a force is applied to the fixing bolt 15 so that the fixing bolt 15 drives the sliding baffle 14 to slide, and the sliding baffle 14 is slid to a specified position, and then another identical device is used to push out the target area shape on the other side. The two devices are combined to shield the outside of the target area to facilitate radiation exposure. After sliding to a suitable position, the fastening screw 17 is rotated to rotate and move the fastening screw 17 in the connecting screw groove 16 to push the outer baffle 13 on the outside. The rotation of the fastening screw 17 can push and pressurize the outer baffle 13 and the sliding baffle 14. The positions of the outer baffle plate 13 and the sliding baffle plate 14 are fixed to facilitate the shaping of the shielding area. By splicing the protruding and recessed parts at the top of the sliding baffle plate 14, the outside of the target area can be completely shielded. When the two shielding mechanisms need to be spliced, the threaded rod 20 at the top can be rotated to rotate and move in the threaded sleeve 19, the two devices can be connected in series, and the distance between the two devices can be adjusted. After the adjustment is completed, the prefabricated block 25 is placed in the bottom plate 21 of the electron tube, and then the shielding mechanism and the fastening mechanism are placed on the inner side of the two connecting slide rails 24 at the top of the bottom plate 21 of the electron tube for use.

[0043] 7. A method for using an electron beam radiotherapy field block, characterized in that it comprises the following steps:

[0044] S1. When performing radiotherapy on a patient, first select the light-limiting cylinder, place the prefabricated block 25 in the light-limiting cylinder tray 21, and then place the shielding box consisting of the entire shielding mechanism, the fastening mechanism and the connecting bracket between the two connecting slide rails 24 and above the prefabricated block 25;

[0045] S2. Depending on the shape and size of the patient's target area, light-limiting tubes of different sizes will be selected to connect with the linear accelerator. The prefabricated block 25 placed in the light-limiting tube tray will be selected according to the size of the patient's target area. The model of the prefabricated block 25 can adapt to light-limiting tubes of specifications such as 6cm×6cm, 10cm×10cm, 15cm×15cm, 20cm×20cm and 25cm×25cm. The selection of the light-limiting tube and the prefabricated block is based on the principle of the smallest model that can cover the target area.

[0046] S3, then rotate the threaded rod 20 so that the threaded rod 20 installs the two shielding boxes together, and adjust the spacing between the shielding mechanisms on both sides according to the width of the target area, and then push the fixing bolt 15 so that the fixing bolt 15 drives the sliding baffle 14 to slide in the connecting bracket 11, and push multiple fixing bolts 15 to slide and piece together into the shape of the patient's target area. For the area outside the target area, push the remaining sliding baffles on both sides that are not involved in the shaping to make them completely closed, and then rotate the fastening mechanism to limit the shielding mechanism;

[0047] S4. During the first treatment of the patient, a transparent acrylic plate can be used to depict the shape of the target area on the patient, and key information such as the patient's name, treatment number, and model number of the light-limiting tube and prefabricated block can be marked, and archived for multiple uses. When in use, two shielding boxes are placed on the acrylic plate, and the threaded rod 20 is rotated according to the width of the target area to adjust the spacing between the shielding mechanisms on both sides, and the shape of the sliding baffle is pushed out according to the shape of the target area. For the area outside the target area, the remaining sliding baffles that are not involved in the shaping are pushed to make them tightly closed and lock the fastening mechanism; during treatment, it is placed on the two connecting slide rails 24 above the light-limiting tube tray and the prefabricated block, and the light-limiting tube and the prefabricated block are used to provide precise treatment to the patient's target area.

[0048] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An electron beam radiotherapy field block, characterized in that: It comprises a rear end plate (1), two side walls of the rear end plate (1) are fixedly connected to connecting brackets (11), and one end of the connecting bracket (11) away from the rear end plate (1) is fixedly connected to a front end plate (12); A shielding mechanism, wherein the shielding mechanism is arranged on the inner side wall of the connecting bracket (11); A fastening mechanism is provided on an outer side wall of the connecting bracket (11).

2. The electron beam radiotherapy field block according to claim 1, characterized in that: The shielding mechanism comprises an outer baffle plate (13), wherein the outer baffle plates (13) are two inner side walls of the connecting bracket (11), and the two outer baffle plates (13) are also slidably connected between the front end plate (12) and the rear end plate (1).

3. The electron beam radiation therapy field block according to claim 2, characterized in that: A plurality of sliding baffles (14) are slidably connected between the two outer baffles (13), and the ends of the plurality of sliding baffles (14) and the plurality of outer baffles (13) are fixedly connected with fixing bolts (15).

4. The electron beam radiotherapy field block according to claim 1, characterized in that: The fastening mechanism comprises a connecting screw groove (16), wherein the connecting screw groove (16) is formed on the inner side wall of one of the connecting brackets (11), and a fastening screw rod (17) is threadedly connected to the inner side wall of the connecting screw groove (16).

5. The electron beam radiotherapy field block according to claim 3, characterized in that: The plurality of sliding baffles (14) are slidably connected between the front end plate (12) and the rear end plate (1).

6. The electron beam radiotherapy field block according to claim 1, characterized in that: The top ends of the rear end plate (1) and the front end plate (12) are fixedly connected with threaded sleeves (19), and the inner side wall of the threaded sleeve (19) is threadedly connected with a threaded rod (20).

7. The electron beam radiotherapy field block according to claim 1, characterized in that: The outer side wall of the rear end plate (1) is provided with a sliding mechanism, the sliding mechanism comprising an electron tube bottom plate (21), the electron tube bottom plate (21) is movably connected to the bottom end of the rear end plate (1), a plurality of support rods (22) are fixedly connected to the top end of the electron tube bottom plate (21), a top baffle (23) is fixedly connected to the top end of the plurality of support rods (22), two connecting slide rails (24) are fixedly connected to the top end of the electron tube bottom plate (21), the two connecting slide rails (24) and the rear end plate (1) are slidably connected, the limiting sleeve (26) is fixedly connected to the top end of the front end plate (12), and the penetration rod (27) penetrates and is slidably connected to the inner side wall of the limiting sleeve (26).

8. A method for using an electron beam radiotherapy field block, characterized in that: The following steps are involved: S1. When performing radiotherapy on a patient, first select the light-limiting cylinder, place the prefabricated block 25 in the light-limiting cylinder tray 21, and then place the shielding box consisting of the entire shielding mechanism, the fastening mechanism and the connecting bracket between the two connecting slide rails 24 and above the prefabricated block 25; S2. Depending on the shape and size of the patient's target area, light-limiting tubes of different sizes will be selected to connect with the linear accelerator. The prefabricated block 25 placed in the light-limiting tube tray will be selected according to the size of the patient's target area. The model of the prefabricated block 25 can adapt to light-limiting tubes of specifications such as 6cm×6cm, 10cm×10cm, 15cm×15cm, 20cm×20cm and 25cm×25cm. The selection of the light-limiting tube and the prefabricated block is based on the principle of the smallest model that can cover the target area. S3, then rotate the threaded rod (20) so that the threaded rod (20) installs the two shielding boxes together, and adjusts the spacing between the shielding mechanisms on both sides according to the width of the target area, and then pushes the fixing bolt (15) so that the fixing bolt (15) drives the sliding baffle (14) to slide in the connecting bracket (11), and pushes multiple fixing bolts (15) to slide and piece together into the shape of the patient's target area. In the area outside the target area, push the remaining sliding baffles on both sides that are not involved in shaping to make them completely closed, and then rotate the fastening mechanism to limit the shielding mechanism; S4. During the first treatment of a patient, a transparent acrylic plate can be used to depict the shape of the target area on the patient, and key information such as the patient's name, treatment number, light-limiting tube and prefabricated block model can be marked, and archived for multiple uses. When in use, two shielding boxes are placed on the acrylic plate, and the threaded rod (20) is rotated according to the width of the target area to adjust the spacing between the shielding mechanisms on both sides, and the shape of the sliding baffle is pushed out according to the shape of the target area. For the area outside the target area, the remaining sliding baffles that are not involved in the shaping are pushed to make them tightly closed and lock the fastening mechanism; during treatment, it is placed on the two connecting slide rails (24) above the light-limiting tube tray and the prefabricated block, and the light-limiting tube and the prefabricated block are used to provide precise treatment to the patient's target area.

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