Blade transmission mechanism of multi-leaf grating for tumor intensity modulated radiation therapy

Abstract

A blade transmission mechanism of a multi-leaf grating for tumor intensity modulated radiation therapy comprises a mounting plate, supporting rods which extend upwards are symmetrically arranged at the top of the mounting plate, fixing rings which are mutually connected through connecting rods are arranged between the supporting rods at intervals, rotating columns which are rotationally connected are arranged on the fixing rings, and gratings which are connected through rotating rods are arranged on the rotating columns at intervals. A connecting plate is arranged on the side face of the supporting rod, a motor is arranged on the connecting plate, sliding rods are symmetrically arranged on the supporting rod, and racks in sliding connection are arranged on the sliding rods; the utility model has a simple and reasonable structure, and can effectively and quickly open and close the grating, thereby reducing the time of radiotherapy light irradiation on the body of a patient.

Description

Technical Field

[0001] This utility model relates to the field of multi-leaf gratings, specifically a leaf drive mechanism for a multi-leaf grating used in intensity-modulated radiotherapy for tumors. Background Technology

[0002] Multi-leaf collimators are commonly used in radiotherapy equipment. During use, the radiotherapy beams are blocked by rotating the collimator, resulting in irregularly shaped beams and reducing obstruction of areas of the body that do not require radiotherapy. Existing collimators are adjusted by vertical sliding, which becomes cumbersome when there are many blades. Therefore, they cannot accommodate the rapid rotation of the collimator blades to reduce radiotherapy exposure to the patient. Utility Model Content

[0003] The present invention aims to provide a blade transmission mechanism for a multi-leaf grating used in intensity-modulated radiotherapy for tumors to achieve rapid adjustment of the grating blades.

[0004] To solve the above technical problems, the specific solution adopted by this utility model is as follows:

[0005] A leaf drive mechanism for a multi-leaf grating used in intensity-modulated radiotherapy (IMRT) of tumors includes a mounting plate. Symmetrically arranged upward-extending support rods are provided on the top of the mounting plate. Fixed rings, connected to each other by connecting rods, are spaced apart between the support rods. Each fixed ring has a rotatably connected rotating column. Gratings, connected by rotating rods, are spaced apart on the rotating columns. A connecting plate is provided on the side of each support rod, and a motor is mounted on the connecting plate. Symmetrically arranged sliding rods are provided on each support rod. A slidably connected rack is provided on each sliding rod. A groove is formed on the rack for the sliding rod to pass through. A limiting block for fixing is provided at the end of the sliding rod passing through the groove. A drive gear for driving the rack to rotate is provided on the output shaft of the motor. A first gear meshes with the rack at the end of each rotating column passing through the fixed ring. The first gear drives the rotating column to rotate via the rack.

[0006] A fixed plate is provided on one end of the rotating column opposite to the first gear. An electric push rod is provided on the fixed plate. A second gear is provided on one end of the rotating rod located inside the rotating column. A retaining tooth is provided on the output shaft of the electric push rod. The retaining tooth meshes with the second gear. The rotating rod is driven by the second gear to rotate on the rotating column.

[0007] The signal input terminals of the motor and electric push rod are connected to the PLC controller.

[0008] The inner wall of the fixed ring is provided with a concave rotating groove, and the circumferential surface of the rotating column located in the rotating groove is provided with an annular protrusion embedded in the rotating groove.

[0009] The grating and the rotating rod are fixedly connected.

[0010] Due to the adoption of the above technical solution, this utility model has the following beneficial effects:

[0011] By setting a click to drive the rotating column to rotate, the grating can be opened and closed laterally. By setting an electric push rod to drive the drive rod to move, the grating can be rotated, allowing the radiation light to pass through quickly for radiotherapy to the patient. The structure of this utility model is simple and reasonable, and it can effectively and quickly open and close the grating, thereby reducing the time that the patient is exposed to radiation light. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the other side of the structure of this utility model;

[0014] Figure 3 This is an enlarged schematic diagram of point A in this utility model;

[0015] Figure 4 This is a schematic diagram of the internal structure of the rotating column of this utility model;

[0016] Reference numerals: Mounting plate 1; Support rod 2; Connecting rod 3; Fixing ring 4; Rotating column 5; First gear 6; Rotating rod 7; Grating 8; Fixing plate 10; Electric push rod 11; Motor 12; Drive gear 13; Rack 14; Slide groove 15; Slide rod 16; Limiting block 17; Drive rod 18; Clamping tooth 19; Second gear 20. Detailed Implementation

[0017] like Figures 1-4 As shown, a leaf drive mechanism for a multi-leaf grating used in intensity-modulated radiotherapy for tumors includes a mounting plate 1. Symmetrically arranged upwardly extending support rods 2 are provided on the top of the mounting plate 1. Fixed rings 4, connected to each other via connecting rods 3, are spaced apart between the support rods 2. Rotating columns 5 are rotatably connected to each fixed ring 4. Gratings 8, connected to each rotating column 5 via rotating rods 7, are spaced apart on the rotating columns 5. A connecting plate is provided on the side of the support rods 2, and a motor 12 is provided on the connecting plate. Sliding rods 16 are symmetrically arranged on the support rods 2, and racks 14 are slidably connected to the sliding rods 16. The racks 14 have openings... A sliding groove 15 is provided for the sliding rod 16 to pass through. A limiting block 17 for fixing is provided on one end of the sliding rod 16 passing through the sliding groove 15. A drive gear 13 for driving the rack 14 to rotate is provided on the output shaft of the motor 12. A first gear 6 that meshes with the rack 14 is provided on one end of the rotating column 5 passing through the fixing ring 4. The first gear 6 drives the rotating column 5 to rotate through the rack 14. The first gear 6 and the rotating column 5 are an integral structure. After the rack 4 is fixed by the limiting block 17, it can only move left and right in one direction. The movement of the rack 14 can be driven by the motor 12.

[0018] A fixing plate 10 is provided on one end of the rotating column 5 opposite to the first gear 6. An electric push rod 11 is provided on the fixing plate 10. A second gear 20 is provided on one end of the rotating rod 7 located inside the rotating column 5. A retaining tooth 19 is provided on the output shaft of the electric push rod 11. The retaining tooth 19 meshes with the second gear 20. The rotating rod 7 is driven to rotate on the rotating column 5 by the second gear 20. The electric push rod 11 pushes the drive rod 18 to move, thereby driving the rotating rod 7 to rotate.

[0019] The signal input terminals of the motor 12 and the electric push rod 11 are connected to the PLC controller, and the operator can control the motor 12 and the electric push rod 11 to work through the PLC controller.

[0020] The inner wall of the fixed ring 4 is provided with a concave rotating groove, and the rotating column 5 is provided with an annular protrusion embedded in the rotating groove on its circumferential surface. Through the rotating groove, the rotating column 5 can rotate within the fixed ring 4 without falling off. A bearing is also provided between the rotating groove and the rotating column 5.

[0021] The grating 8 and the rotating rod 7 are fixedly connected. The bottom of the grating 8 is provided with a plug, and the top of the rotating rod 7 is provided with a socket for threaded connection of the plug.

[0022] The method of using this utility model is briefly described as follows:

[0023] The motor 12 is controlled by a PLC controller. During operation, the motor 12 can rotate forward and backward. During forward rotation, the drive gear 13 rotates, which in turn drives the rack 14 to move left and right. During the movement of the rack 14, all the first gears 6 rotate. The first gears 6 drive the rotating column 5 to rotate. During the rotation of the rotating column 5, the grating 8 moves, thereby blocking the radiation rays. The electric push rod 11 inside the rotating column 5 can drive the drive rod 18 to move. The locking teeth 19 on the drive rod 18 drive the second gear 20 to rotate. The second gear 20 can drive the rotating rod 7 to rotate, thereby controlling the rotation of the grating 8 to refract the radiation rays.

Claims

1. A leaf drive mechanism for a multi-leaf grating used in intensity-modulated radiotherapy for tumors, characterized in that: The system includes a mounting plate (1), on which symmetrically extended upward support rods (2) are provided at the top. Fixed rings (4) are spaced apart between the support rods (2) and connected to each other via connecting rods (3). Each fixed ring (4) is provided with a rotating column (5) rotatably connected to it. A grating (8) connected to the rotating column (5) via a rotating rod (7) is spaced apart on each rotating column (5). A connecting plate is provided on the side of the support rod (2), and a motor (12) is provided on the connecting plate. Sliding rods (16) are symmetrically provided on the support rods (2), and each sliding rod (16) is provided with a sliding... The rack (14) is dynamically connected. The rack (14) has a groove (15) for the slide rod (16) to pass through. The end of the slide rod (16) that passes through the groove (15) is provided with a limiting block (17) for fixing. The output shaft of the motor (12) is provided with a drive gear (13) for driving the rack (14) to rotate. The end of the rotating column (5) that passes through the fixing ring (4) is provided with a first gear (6) that meshes with the rack (14). The first gear (6) drives the rotating column (5) to rotate through the rack (14).

2. The leaf drive mechanism of the multi-leaf grating for intensity-modulated radiotherapy of tumors according to claim 1, characterized in that: A fixing plate (10) is provided on one end of the rotating column (5) opposite to the first gear (6). An electric push rod (11) is provided on the fixing plate (10). A second gear (20) is provided on one end of the rotating rod (7) inside the rotating column (5). A locking tooth (19) is provided on the output shaft of the electric push rod (11). The locking tooth (19) meshes with the second gear (20). The rotating rod (7) is driven by the second gear (20) to rotate on the rotating column (5).

3. The leaf drive mechanism of the multi-leaf grating for intensity-modulated radiotherapy of tumors according to claim 2, characterized in that: The signal input terminals of the motor (12) and electric push rod (11) are connected to the PLC controller.

4. The leaf drive mechanism of the multi-leaf grating for intensity-modulated radiotherapy of tumors according to claim 1, characterized in that: The inner wall of the fixed ring (4) is provided with a concave rotating groove, and the rotating column (5) is provided with an annular protrusion embedded in the rotating groove on its circumferential surface.

5. The leaf drive mechanism of the multi-leaf grating for intensity-modulated radiotherapy of tumors according to claim 1, characterized in that: The grating (8) and the rotating rod (7) are fixedly connected.

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