Front pointer for accelerator

Abstract

The utility model relates to a front pointer for an accelerator, and the front pointer comprises a fixed assembly which is connected with the accelerator, and is provided with at least two magnets with seats, and the two magnets with seats are arranged at intervals along the length direction of the fixed assembly; the pointer assembly is detachably connected with the fixing assembly, the pointer assembly comprises a pointer rod, the pointer rod is made of a magnetic attraction material, the pointer rod and the magnet with the base attract each other, and the installation position of the pointer assembly relative to the fixing assembly is adjustable; the pointer is connected with the first end of the pointer rod, the first end is the end, away from the fixing assembly, of the pointer rod, the pointer is used for indicating the isocenter of the accelerator, and the technical problems that in the prior art, a front pointer is complex in structure and tedious in adjustment and calibration can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of radiotherapy surgical equipment, and particularly relates to a front pointer for an accelerator. Background Art

[0002] In radiotherapy equipment, the isocenter refers to a common center point around which the reference axes of the various movements in the radiotherapy equipment revolve. The beam axes all pass through the smallest sphere centered on this point. The main function of the isocenter is to ensure the accuracy of radiotherapy, so that the radiation can accurately align with the tumor position, while reducing the damage to the surrounding normal tissues.

[0003] Due to reasons such as assembly and calibration errors and aging and wear of moving parts in actual radiotherapy equipment, there will be errors in the isocenter. Specifically, the patient's treatment position does not match the planned position, the visual field deviation brings dose deviation of the target tissue, and the actual dose distribution is inconsistent with the plan. Therefore, it is necessary to measure and calibrate the isocenter of the equipment.

[0004] The front pointer is an important tool for calibrating the isocenter of existing radiotherapy equipment, but the existing front pointer has disadvantages such as complex structure and cumbersome calibration.

[0005] Based on this, the existing technology needs to be further developed. Summary of the Utility Model

[0006] In view of the various deficiencies of the existing technology, a front pointer for an accelerator is proposed to solve the technical problems of complex structure and cumbersome calibration of the front pointer in the existing technology.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] A front pointer for an accelerator, comprising: a fixing component, the fixing component is connected to the accelerator, and at least two socket magnets are arranged on the fixing component, and the two socket magnets are arranged at intervals along the length direction of the fixing component; a pointer component, the pointer component is detachably connected to the fixing component, and the pointer component includes: a pointer rod, the pointer rod is made of a magnetizable material, and the pointer rod and the socket magnets adsorb each other to realize that the installation position of the pointer component relative to the fixing component is adjustable; a pointer, the pointer is connected to the first end of the pointer rod, the first end is the end of the pointer rod away from the fixing component, and the pointer is used to indicate the isocenter of the accelerator.

[0009] This technical solution is further set as follows: it further includes: a bracket for connecting the accelerator; an adjusting plate, the adjusting plate is connected to the bracket through an adjusting component to adjust the spatial attitude of the adjusting plate, and the fixing component is connected to the side of the adjusting plate away from the bracket.

[0010] This technical solution is further configured such that the fixing component includes: a fixing base, the fixing base is connected to the adjusting plate, and a receiving groove for the pointer rod to pass through is formed on the fixing base; a semi-milled cylindrical seat, the semi-milled cylindrical seat is fixedly arranged on the side of the fixing base away from the adjusting plate, and the magnet with seat is arranged on the cylindrical wall of the semi-milled cylindrical seat.

[0011] This technical solution is further configured such that a marking line is arranged on the semi-milled cylindrical seat, and a scale ruler is arranged on the pointer rod.

[0012] This technical solution is further configured such that a through hole for installing the magnet with seat is formed on the cylindrical wall of the semi-milled cylindrical seat, and the magnet with seat includes: a magnet seat, the magnet seat is embedded in the through hole; a magnet, the magnet is threadedly connected to the magnet seat to adjust the adsorption force between the magnet and the pointer rod.

[0013] This technical solution is further configured such that a spirit level is connected to the adjusting plate, at least two spirit levels are provided, and the included angle between at least two spirit levels is greater than 0° and less than 180°.

[0014] This technical solution is further configured such that the spirit level includes a first spirit level and a second spirit level, and the first spirit level is perpendicularly arranged to the second spirit level.

[0015] This technical solution is further configured to further include a displacement stage, the displacement stage is located between the fixing base and the adjusting plate, and the displacement stage can drive the fixing base to move along the X-axis, Y-axis, and Z-axis directions.

[0016] This technical solution is further configured such that a second positioning hole and a connection hole communicating with the second positioning hole are formed at the first end of the pointer rod, and the aperture of the second positioning hole is larger than that of the connection hole; the pointer assembly further includes a tip clamp seat, the tip clamp seat includes a first connection portion, a positioning portion, and a second connection portion connected in sequence, a first positioning hole for installing the pointer is formed on the second connection portion, and the positioning portion is coaxially arranged with the first positioning hole; when the tip clamp seat is connected to the pointer rod, the outer surface of the positioning portion is in contact with the hole wall of the second positioning hole, the first connection portion is threadedly connected to the connection hole, and the first positioning hole is coaxially arranged with the second positioning hole; when the pointer is installed into the first positioning hole, the outer surface of the pointer is in contact with the hole wall of the first positioning hole.

[0017] This technical solution is further configured such that a threaded hole for a fastening screw to pass through is formed on the second connection portion, and when the pointer is installed into the first positioning hole, the fastening screw passes through the threaded hole to fix the pointer in the first positioning hole.

[0018] The beneficial effects of the present utility model are as follows:

[0019] The pointer rod is made of a magnetizable material and is connected to the fixing component through a magnet with a seat. On the one hand, the magnet with a seat adsorbs the pointer rod to the fixing component, thus realizing the reliable fixation of the pointer component. On the other hand, when it is necessary to greatly adjust the position of the pointer component in the vertical direction, the pointer component can be manually removed from the fixing component and moved near the target position. The structure is simple and the operation is convenient, and the position of the pointer component can be adjusted quickly, thereby improving the calibration efficiency of the front pointer for the accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the front pointer for the accelerator adopted in the embodiment of the present utility model;

[0021] Figure 2 is a schematic diagram of the fixing component adopted in the embodiment of the present utility model;

[0022] Figure 3 is a schematic diagram of the pointer component adopted in the embodiment of the present utility model;

[0023] Figure 4 is a partial cross-sectional view of the pointer component adopted in the embodiment of the present utility model.

[0024] In the drawings: 1, support; 2, adjustment plate; 21, adjusting screw; 22, connecting bolt; 3, displacement table; 4, first level; 5, second level; 6, fixing component; 61, fixing seat; 62, semi-milled cylindrical seat; 621, marking line; 63, magnet with a seat; 7, pointer component; 71, pointer rod; 711, scale ruler; 712, second positioning hole; 713, connecting hole; 72, tip clamp seat; 721, fastening screw; 722, first connecting portion; 723, positioning portion; 724, second connecting portion; 725, first positioning hole; 73, pointer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the drawings of the present utility model. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without making creative efforts shall all fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "upper", "lower", "left", "right", etc., are only the directions referring to the drawings. Therefore, the directional terms used are for illustration rather than to limit the present invention.

[0026] The present utility model will be further described below in conjunction with the drawings and preferred embodiments.

[0027] According to an embodiment of the present utility model, a front pointer for an accelerator is provided. Refer to Figures 1 to 4 , including: a fixing component 6, the fixing component 6 is connected to the accelerator, and at least two pedestal magnets 63 are arranged on the fixing component 6, and the two pedestal magnets 63 are arranged at intervals along the length direction of the fixing component 6; a pointer component 7, the pointer component 7 is detachably connected to the fixing component 6, and the pointer component 7 includes: a pointer rod 71, the pointer rod 71 is made of a magnetizable material, and the pointer rod 71 and the pedestal magnet 63 attract each other, facilitating the adjustment of the installation position of the pointer component 7 relative to the fixing component 6; a pointer 73, the pointer 73 is connected to the first end of the pointer rod 71, and the first end is the end of the pointer rod 71 away from the fixing component 6, and the pointer 73 is used to indicate the isocenter of the accelerator.

[0028] It should be noted that the pointer rod 71 is made of a magnetizable material and is connected to the fixing component 6 through the pedestal magnet 63. On the one hand, the pedestal magnet 63 attracts the pointer rod 71 to the fixing component 6, thereby realizing the reliable fixation of the pointer component 7; on the other hand, when it is necessary to greatly adjust the position of the pointer component 7 in the vertical direction, the pointer component 7 can be manually removed from the fixing component 6 and moved near the target position. The structure is simple, the operation is convenient, and the position of the pointer component 7 can be quickly adjusted, thereby improving the calibration efficiency of the front pointer for the accelerator.

[0029] In the front pointer for the accelerator of this embodiment, it further includes: a bracket 1, the bracket 1 is used to connect the accelerator; an adjustment plate 2, the adjustment plate 2 and the bracket 1 realize the adjustment of the spatial attitude of the adjustment plate 2 through an adjustment component, and the fixing component 6 is connected to the side of the adjustment plate 2 away from the bracket 1, and by adjusting the adjustment component, the adjustment plate 2 is in a horizontal position. Specifically, the bracket is connected to the small head of the accelerator.

[0030] In the front pointer for the accelerator of this embodiment, the adjustment component includes an adjustment screw 21 and a connecting bolt 22; the adjustment screw 21 passes through the adjustment plate 2 by means of threaded connection and abuts against the bracket 1, and the adjustment screw 21 is rotated to adjust the spatial state of the adjustment plate 2. After adjustment, the adjustment plate 2 and the bracket 1 are connected together by the connecting bolt 22.

[0031] Specifically, the adjustment component includes at least three adjustment screws 21, the three adjustment screws 21 are arranged non-collinearly, the connecting bolt 22 is arranged corresponding to the adjustment screw 21 one by one, and the two are arranged adjacent to each other. The spatial state of the adjustment plate 2 is adjusted by rotating the adjustment screw 21; after the spatial state of the adjustment plate 2 is adjusted, the connecting bolt 22 between the adjustment plate 2 and the bracket 1 is used for connection and locking.

[0032] In the front pointer for an accelerator according to this embodiment, the adjusting assembly includes four adjusting screws 21, and the four adjusting screws 21 are respectively located at the four corners of the adjusting plate, which can more evenly distribute the adjusting force and make it easier to make the adjusting plate 2 reach an accurate horizontal state.

[0033] In the front pointer for an accelerator according to this embodiment, the fixing assembly 6 includes: a fixing base 61, the fixing base 61 is connected to the adjusting plate 2, and a receiving groove for the pointer rod 71 to pass through is formed on the fixing base 61, thereby increasing the adjustable range of the pointer rod 71 in the vertical direction; a semi-milled cylindrical base 62, the semi-milled cylindrical base 62 is fixedly provided on the side of the fixing base 61 away from the adjusting plate 2, and the magnet with seat 63 is arranged on the cylindrical wall of the semi-milled cylindrical base 62. The semi-milled form is convenient for adjusting the relative position relationship between the pointer assembly 7 and the fixing assembly 6.

[0034] In the front pointer for an accelerator according to this embodiment, a marking line 621 is provided on the semi-milled cylindrical base 62, and a scale ruler 711 is provided on the pointer rod 71. The scale ruler 711 and the marking line 621 cooperate with each other, and the relative position relationship between the pointer rod 71 and the semi-milled cylindrical base 62 can be intuitively seen, which is convenient for quickly adjusting the position of the pointer assembly 7 in the vertical direction.

[0035] In the front pointer for an accelerator according to this embodiment, a through hole for installing the magnet with seat 63 is formed on the cylindrical wall of the semi-milled cylindrical base 62, and the magnet with seat 63 includes: a magnet seat, the magnet seat is embedded in the through hole; a magnet, the magnet is threadedly connected to the magnet seat to adjust the adsorption force between the magnet and the pointer rod 71.

[0036] It should be noted that the closer the relative distance between the magnet and the pointer rod 71 is, the greater the adsorption force between the two, and the more reliable the connection between the pointer assembly 7 and the fixing assembly 6 is. Correspondingly, the relative position relationship between the pointer assembly 7 and the fixing assembly 6 is more difficult to adjust. For example, during the isocenter measurement process, it is required that the connection be reliable when the gantry or the small collimator rotates for measurement; the farther the relative distance between the magnet and the pointer rod 71 is, the smaller the adsorption force between the two, and the easier the relative position relationship between the pointer assembly 7 and the fixing assembly 6 is to adjust. For example, when the position of the pointer assembly 7 needs to be adjusted, it is required that the adsorption force is small and easy to adjust. Of course, correspondingly, the connection reliability between the pointer assembly 7 and the fixing assembly 6 is lower. By adjusting the relative distance between the magnet and the pointer rod 71, the relative position relationship between the pointer assembly 7 and the fixing assembly 6 can be easily adjusted on the premise of ensuring the connection reliability between the pointer assembly 7 and the fixing assembly 6. Preferably, a cutting groove for cooperating with a screwdriver can be provided at one end of the magnet away from the pointer rod 71 to facilitate adjusting the position of the magnet, thereby adjusting the adsorption force between the magnet and the pointer rod 71.

[0037] In the front pointer for an accelerator of this embodiment, a spirit level is connected to the adjustment plate 2. There are at least two spirit levels, and the included angle between at least two spirit levels is greater than 0° and less than 180°.

[0038] It should be noted that forming a certain included angle between two spirit levels can intuitively judge the spatial attitude of the adjustment plate 2, which is convenient for quickly and accurately adjusting the adjustment plate 2 to the horizontal, facilitating subsequent calibration.

[0039] In the front pointer for an accelerator of this embodiment, the spirit level includes a first spirit level 4 and a second spirit level 5. The first spirit level 4 and the second spirit level 5 are perpendicularly arranged to ensure that the adjustment plate 2 meets the horizontal requirements in multiple dimensions, which helps to more precisely determine and adjust the spatial attitude of the adjustment plate 2 and improve the measurement accuracy of the isocenter.

[0040] In the front pointer for an accelerator of this embodiment, a displacement stage 3 is further included. The displacement stage 3 is located between the fixed seat 61 and the adjustment plate 2, and the displacement stage 3 can drive the fixed seat 61 to move along the X-axis, Y-axis, and Z-axis directions.

[0041] Specifically, any commercially available three-axis displacement stage can be selected for the displacement stage 3, as long as it has the freedom of translational movement in the three directions of the X-axis, Y-axis, and Z-axis. The pointer assembly 7 can be slightly adjusted on the X-axis, Y-axis, and Z-axis through the displacement stage 3.

[0042] In the front pointer for an accelerator of this embodiment, a second positioning hole 712 and a connection hole 713 communicating with the second positioning hole 712 are formed at the first end of the pointer rod 71. The aperture of the second positioning hole 712 is larger than that of the connection hole 713. The pointer assembly 7 further includes a tip holder 72. The tip holder 72 includes a first connection portion 722, a positioning portion 723, and a second connection portion 724 connected in sequence. A first positioning hole 725 for installing the pointer 73 is formed on the second connection portion 724, and the positioning portion 723 is coaxially arranged with the first positioning hole 725. When the tip holder 72 is connected to the pointer rod 71, the outer surface of the positioning portion 723 fits against the inner wall of the second positioning hole 712, the first connection portion 722 is threadedly connected to the connection hole 713, and the first positioning hole 725 is coaxially arranged with the second positioning hole 712. When the pointer 73 is installed in the first positioning hole 725, the outer surface of the pointer 73 fits against the inner wall of the first positioning hole 725. Specifically, the first connection portion 722, the positioning portion 723, and the second connection portion 724 are integrally formed.

[0043] It should be noted that when the pointer rod 71, the tip holder 72 and the pointer 73 are connected, the positioning portion 723 on the tip holder 72 cooperates with the second positioning hole 712 on the pointer rod 71 to position the installation position of the tip holder 72. At the same time, the first connecting portion 722 is threadedly connected to the connecting hole 713 to realize the coaxial connection between the tip holder 72 and the pointer rod 71. In addition, the pointer 73 is coaxially connected to the tip holder 72 by means of the first positioning hole 725 on the tip holder 72, so as to ensure the coaxial movement of the pointer rod 71 and the pointer 73, and further ensure the measurement accuracy of the isocenter.

[0044] In the front pointer for the accelerator of this embodiment, a threaded hole for the fastening screw 721 to pass through is provided on the second connecting portion 724. When the pointer 73 is installed in the first positioning hole 725, the fastening screw 721 passes through the threaded hole to fix the pointer 73 in the first positioning hole 725. The pointer 73 is fixed on the tip holder 72 by the fastening screw 721, which ensures the stability of the pointer 73 when the front pointer for the accelerator rotates with the small gantry of the accelerator, and reduces the measurement error of the isocenter.

[0045] During use, first level the small gantry of the accelerator, and then connect the bracket 1 to the accelerator. At this time, the tip of the pointer 73 faces downward. By observing the states of the first level 4 and the second level 5, adjust the adjusting screw 21 to level the adjusting plate 2. Place the electron microscope below the pointer assembly 7. After adjusting the pointer assembly 7 so that the tip of the pointer 73 is 5 - 15 mm away from the electron microscope, adjust the focal length of the electron microscope so that the movement position of the pointer 73 can be clearly observed on the industrial control software of the electron microscope. Subsequently, control the full - stroke rotational movement of the small gantry, observe and measure the offset between the center position of the pointer 73 itself and the center point of the rotation trajectory from the industrial control software of the electron microscope. If the tip of the pointer 73 has a position deviation, adjust it through the displacement stage 3 so that the pointer 73 moves to the center point of the rotation trajectory, then align the tip of the pointer 73 with the intersection of the coordinate paper, continue to rotate the small gantry, and adjust until there is no drift of the tip. At this time, the point indicated by the pointer 73 is the rotation isocenter of the small gantry.

[0046] After finding the rotation center of the small gantry, rotate the gantry of the accelerator, and at the same time observe and record the movement trajectory of the tip of the pointer 73 through the electron microscope. If the tip of the pointer 73 has a position deviation from the center point of the rotation trajectory during this process, adjust it again through the displacement stage 3 so that the pointer 73 moves to the center point of the gantry rotation trajectory, then rotate the gantry again, continue to observe and record the movement trajectory of the tip of the pointer 73 until there is no drift of the tip. The point indicated by this pointer 73 is the rotation isocenter of the gantry and the small gantry.

[0047] The above has made a detailed description of the present utility model. As mentioned above, the above is only the preferred embodiment of the present utility model, and it cannot limit the scope of implementation of the present utility model. That is, all equal changes and modifications made according to the scope of this application should still fall within the scope covered by the present utility model.

Claims

1. A front pointer for an accelerator, characterized in that, Comprising: A fixing component, which is connected to the accelerator. At least two pedestal magnets are arranged on the fixing component, and the two pedestal magnets are arranged at intervals along the length direction of the fixing component; A pointer component, which is detachably connected to the fixing component. The pointer component includes: A pointer rod, which is made of a magnetizable material. The pointer rod and the pedestal magnet attract each other to facilitate adjusting the installation position of the pointer component relative to the fixing component; A pointer, which is connected to the first end of the pointer rod. The first end is the end of the pointer rod far from the fixing component, and the pointer is used to indicate the isocenter of the accelerator.

2. The front pointer for an accelerator according to claim 1, wherein It further includes: A bracket, which is used to connect the accelerator; An adjustment plate, which is connected to the bracket through an adjustment component. The adjustment component is used to adjust the spatial attitude of the adjustment plate, and the fixing component is connected to the side of the adjustment plate far from the bracket.

3. The front pointer for an accelerator according to claim 2, wherein The fixing component includes: A fixing seat, which is connected to the adjustment plate. A receiving groove for the pointer rod to pass through is formed on the fixing seat; A semi-milled cylindrical seat, which is fixedly arranged on the side of the fixing seat far from the adjustment plate. The pedestal magnet is arranged on the cylindrical wall of the semi-milled cylindrical seat.

4. The front pointer for an accelerator according to claim 3, characterized in that, A marking line is arranged on the semi-milled cylindrical seat, and a scale ruler is arranged on the pointer rod.

5. The front pointer for an accelerator according to claim 3, characterized in that, Through holes for installing the pedestal magnet are formed on the cylindrical wall of the semi-milled cylindrical seat. The pedestal magnet includes: A magnet seat, which is embedded in the through hole; A magnet, which is threadedly connected to the magnet seat to adjust the adsorption force between the magnet and the pointer rod.

6. The front pointer for an accelerator according to claim 2, characterized in that, A spirit level is connected to the adjustment plate. At least two spirit levels are provided, and the included angle between at least two spirit levels is greater than 0° and less than 180°.

7. The front pointer for an accelerator according to claim 6, wherein The spirit level includes a first spirit level and a second spirit level, and the first spirit level and the second spirit level are arranged perpendicular to each other.

8. The front pointer for an accelerator according to claim 3, characterized in that, It further includes a displacement stage, which is located between the fixing seat and the adjustment plate. The displacement stage can drive the fixing seat to move along the X-axis, Y-axis, and Z-axis directions.

9. The front pointer for an accelerator according to any one of claims 1-8, characterized in that, A second positioning hole and a connection hole communicating with the second positioning hole are formed at the first end of the pointer rod. The aperture of the second positioning hole is larger than that of the connection hole; The pointer component further includes a tip clamp seat, which includes a first connection part, a positioning part, and a second connection part connected in sequence. A first positioning hole for installing the pointer is formed on the second connection part, and the positioning part is coaxially arranged with the first positioning hole; When the tip clamp seat is connected to the pointer rod, the outer surface of the positioning part fits against the hole wall of the second positioning hole, the first connection part is threadedly connected to the connection hole, and the first positioning hole is coaxially arranged with the second positioning hole; when the pointer is installed in the first positioning hole, the outer surface of the pointer fits against the hole wall of the first positioning hole.

10. The front pointer for an accelerator according to claim 9, characterized in that, A threaded hole for a fastening screw to pass through is formed on the second connection part. When the pointer is installed in the first positioning hole, the fastening screw passes through the threaded hole to fix the pointer in the first positioning hole.

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