Medical linear accelerator mechanical rotation precision detection device and method

Abstract

The application provides a medical linear accelerator mechanical rotation accuracy detection device and method, wherein the device comprises a stationary pointer, a fixed rod, a movable pointer and a ranging assembly. The stationary pointer and the fixed rod are respectively preassembled on a treatment bed and a support frame, and the fixed rod is provided with a containing groove; the movable pointer is slidingly inserted into the containing groove and is connected with a positioning element. The method comprises the following steps: (1) installing the stationary pointer and the fixed rod; (2) moving the movable pointer; (3) connecting the positioning element and the stationary pointer, and recording the value of the ranging assembly; (4) rotating the support frame, and observing the value change of the ranging assembly; (5) if there is no value change, the accelerator passes the detection; if there is a change, it is determined that the accelerator is damaged, and the value of the ranging assembly after the change is recorded. The medical linear accelerator mechanical rotation accuracy detection device and method provided by the application can reflect the detection result as a value, which is convenient to observe and easy to record, and is beneficial to later analysis.

Description

Technical Field

[0001] This application belongs to the field of medical instrument testing technology, specifically relating to a device and method for testing the mechanical rotation accuracy of a medical linear accelerator. Background Technology

[0002] A medical linear accelerator is a therapeutic instrument that uses radiation to kill tumor tissue. Its components include... Figure 1 As shown, the device includes a gantry 100, a radiation source 200, and a treatment bed 300. The gantry 100 consists of a swing arm 110 and a support frame 120. The radiation source 200 is fixedly mounted on the inner side of the support frame 120 facing the surface of the treatment bed 300 (correspondingly, the side of the support frame 120 facing away from the surface of the treatment bed 300 is its outer side). During actual use of the medical linear accelerator, medical personnel need to frequently perform mechanical rotation accuracy checks on the gantry 100 to calibrate the positions of each component, ensuring the normal operation of the medical linear accelerator.

[0003] The steps for testing the accuracy of mechanical rotation include: placing two pointers on the inner side of the support frame 120 and the surface of the treatment bed 300, respectively, with the axes of the two pointers perpendicular to each other. For ease of description, the pointer placed on the frame 100 is named the fixed rod, and the pointer placed on the treatment bed 300 is named the stationary pointer; furthermore, the axis of the fixed rod is parallel to the direction of the radiation source 200, and the axis of the stationary pointer is parallel to the height direction of the person lying on the bed, and is located at the rotation center of the fixed rod. After positioning and installation, the drive arm 110 is rotated one revolution. During the rotation, the relative positions of the two pointers are manually observed to see if they change. If they do not change, it indicates that the rotation center of the frame 100 is located on the treatment bed 300, and the treatment area can be accurately aligned with the patient's radiation site during treatment.

[0004] The inventors discovered that the above-mentioned operation, which involves manually observing the changes in the relative positions of the fixed rod and the stationary pointer, suffers from low accuracy. Furthermore, the results obtained from manually observing the changes in the relative positions of the two pointers cannot be converted into numerical values, thus preventing their inclusion in the data analysis process and making it impossible to identify the cause of the reduced accuracy. Summary of the Invention

[0005] This application provides a device and method for detecting the mechanical rotation accuracy of a medical linear accelerator, aiming to record the detection results of the mechanical rotation accuracy of the medical linear accelerator in a data-driven manner, so as to solve the technical problem that data recording cannot be obtained due to manual observation of the detection results.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A device for detecting the mechanical rotational accuracy of a medical linear accelerator is provided, comprising:

[0008] A stationary pointer is pre-installed on the treatment bed, with its own axis parallel to the front-back direction, and one end extending from the front edge of the treatment bed;

[0009] A fixing rod is detachably mounted on the inner side of the support frame. Its axis is parallel to the orientation of the radiation source, and a receiving groove extending along the axis of the fixing rod is provided at one end facing away from the support frame.

[0010] A movable pointer is slidably disposed within the receiving groove along the axial direction of the fixed rod, and its own axial direction is parallel to the axial direction of the fixed rod; one end of the movable pointer is adapted to extend out of the opening of the receiving groove, and the extended end is connected to a positioning element adapted to be sleeved on the outer periphery of the stationary pointer; and

[0011] A ranging component is disposed within the receiving groove for detecting the distance between the insertion end of the movable pointer and the bottom of the receiving groove.

[0012] In one possible implementation, the positioning element includes:

[0013] A tightening band is slidably connected to the movable pointer, and the sliding direction is parallel to the length direction of the tightening band; both ends of the tightening band are adapted to hang naturally to the left and right sides of the stationary pointer, and the two ends of the tightening band are defined as a fixed end and a movable end, respectively; and

[0014] A connecting plate is connected to the fixed end; and the connecting plate has two support arms, which are distributed on both sides of the fixed end along the width direction of the tightening band and both extend toward the side where the movable end is located; a locking element for pressing the surface of the tightening band to the connecting plate is provided between the two support arms.

[0015] When the two ends of the tightening band are respectively on the left and right sides of the stationary pointer, pressing the tightening band with the locking element and simultaneously pulling the movable end manually can cause the tightening band to wrap around the outer peripheral wall of the stationary pointer to form an annular positioning space.

[0016] In one possible implementation, the locking element includes:

[0017] A pressure plate is disposed between the two support arms and is used to abut against the outer surface of the tightening strap;

[0018] The protrusion is fixedly connected to one of the support arms; and

[0019] A locking screw is located between the two support arms, and its axial direction is parallel to the length direction of the support arms. The locking screw is threaded to the protrusion, and one end of the screw is rotatably connected to the pressure plate, with the rotation axis being parallel to the length direction of the support arm.

[0020] When the tightening band is between the pressure plate and the connecting plate, rotating the locking screw can cause the pressure plate to move toward or away from the connecting plate to clamp or loosen the tightening band.

[0021] In one possible implementation, the locking element has two sets, each disposed on one of the two support arms; a spring rod is provided between the two pressure plates, and when the spring rod is in its normal state, the axial direction of the spring rod is parallel to the arrangement direction of the two support arms.

[0022] In one possible implementation, the medical linear accelerator mechanical precision detection device further includes:

[0023] A pre-mounted base is used for fixed installation on the outer side of the support frame; the side of the pre-mounted base facing away from the support frame has a slot, and the slot extends through the width of the support frame;

[0024] A locking assembly, disposed on the pre-mounted base, is used to close the opening of the slot or to avoid the opening of the slot;

[0025] A positioning arm is used to insert into the slot and to make its own axis parallel to the width direction of the support frame; two sliding arms are slidably connected to the positioning arm along its own axis, and the two sliding arms are distributed at intervals on both sides of the support frame along the width direction of the support frame, and clamping arms are integrally connected to the adjacent sides of the two sliding arms; when the positioning arm is inserted into the slot, the two clamping arms are both located inside the support frame;

[0026] A synchronous drive component is disposed on the positioning arm and connected to the two sliding arms, for driving the two sliding arms to move towards each other or away from each other;

[0027] When the two sliding arms move toward each other, the two clamping arms are adapted to clamp the fixed rod.

[0028] In one possible implementation, the inner wall of the slot has a groove, and the axial direction of the groove is parallel to the length direction of the support frame; the locking assembly includes:

[0029] A stop arm, slidably disposed within the groove along its axial direction, adapted to extend out of or into the groove; and

[0030] A spring, one end of which is fixedly disposed at the bottom of the groove, with its axial direction parallel to the axial direction of the groove; the other end of the spring is connected to the stop arm;

[0031] Specifically, when the stop arm extends into the groove, the stop arm avoids the opening of the slot, and the spring elastically contracts; when the stop arm closes the opening of the slot, the spring is in a normal state or an elastically contracted state.

[0032] In one possible implementation, the synchronization drive component includes:

[0033] A double-ended screw, with both ends rotatably connected to the two ends of the positioning arm, and the rotation axis of both ends being parallel to the axis of the positioning arm;

[0034] The double-ended screw has two threaded portions with opposite thread directions. The two threaded portions are respectively threaded to the two sliding arms, which are used to drive the two sliding arms to move towards each other or away from each other.

[0035] In one possible implementation, the medical linear accelerator mechanical precision detection device further includes:

[0036] A pre-reserved slot is provided on the front end face of the treatment bed, suitable for inserting the stationary pointer;

[0037] A pre-installed plate, for fixed connection to the front end face of the treatment bed, has an insert suitable for communicating with the pre-reserved slot; and

[0038] A snap-fit ​​connector is fixedly connected to the protruding end of the stationary pointer and is adapted to the recess.

[0039] The stationary pointer has a retracted state in which the latching member is inserted into the recess, and also has an extended state in which it moves from back to front so that the latching member is in front of the pre-installed plate.

[0040] In one possible implementation, the ranging component includes:

[0041] An infrared emitter, fixedly connected to the insertion end of the movable pointer to move synchronously with it; the infrared emitter is used to generate an outgoing light path parallel to the axis of the fixed rod; and

[0042] An infrared sensor is fixedly connected to the bottom of the receiving tank, with its sensing end facing the infrared transmitter to receive the infrared light path.

[0043] In this embodiment, since the stationary pointer and the fixed rod are pre-installed on the treatment bed and the support frame respectively, the process of installing the stationary pointer and the moving pointer is eliminated, thus optimizing the efficiency of the mechanical rotation accuracy detection of the medical linear accelerator. Furthermore, during actual testing, the change in accuracy is reflected in the numerical change obtained by the ranging component, which more intuitively reflects the test results and eliminates errors caused by manual observation; simultaneously, the numerical values ​​can be effectively recorded, facilitating subsequent analysis.

[0044] The medical linear accelerator mechanical rotation accuracy detection device provided in this embodiment, compared with the prior art, can perform an efficient detection process and obtain accurate and intuitive data results, which is convenient for subsequent recording and analysis.

[0045] Based on the aforementioned medical linear accelerator mechanical rotation accuracy testing device, the technical solution adopted in this application also provides a method for testing the mechanical rotation accuracy of a medical linear accelerator, the steps of which include:

[0046] (1) Assemble the stationary pointer onto the treatment bed, with one end extending from the front edge of the treatment bed; at the same time, assemble the fixing rod onto the support frame, with its axis parallel to the axis of the radiation source;

[0047] (2) Move the movable pointer along the axial direction of the fixed rod so that the extended end of the movable pointer approaches the stationary pointer;

[0048] (3) Place the positioning element around the stationary pointer, record the value of the ranging component, and define the value as the standard value;

[0049] (4) Start the medical linear accelerator to rotate the support frame and observe whether the value of the ranging component changes;

[0050] (5) If the value of the ranging component remains at the standard value, the medical linear accelerator is tested for mechanical rotation accuracy; if the value of the ranging component changes, the medical linear accelerator is determined to be damaged, and the test value obtained by the ranging component is recorded.

[0051] The beneficial effects of the medical linear accelerator mechanical rotation accuracy detection method provided in this embodiment are the same as those of the aforementioned detection device, and will not be repeated here. Attached Figure Description

[0052] Figure 1 A schematic diagram of the structure of a medical linear accelerator in the prior art;

[0053] Figure 2One of the three-dimensional structural schematic diagrams of the medical linear accelerator mechanical rotation accuracy detection device provided in the embodiments of this application;

[0054] Figure 3 for Figure 2 A magnified view of a portion of the upper circle at point A;

[0055] Figure 4 A second three-dimensional structural schematic diagram of the medical linear accelerator mechanical rotation accuracy detection device provided in the embodiments of this application (part of the frame and treatment bed are hidden for ease of display).

[0056] Figure 5 This is an exploded view of the stationary pointer, pre-mounted plate, and treatment bed used in the embodiments of this application;

[0057] Figure 6 This is a three-dimensional structural diagram of the movable pointer, positioning element, and locking element used in the embodiments of this application;

[0058] Figure 7 This is a three-dimensional structural diagram of the locking element used in the embodiments of this application;

[0059] Figure 8 This is a schematic diagram of the structure between the movable pointer and the tightening band used in the embodiments of this application;

[0060] Figure 9 This is a schematic diagram of the ranging component used in the embodiments of this application (the fixing rod is shown in cross section for ease of display).

[0061] Figure 10 This is an exploded view of the positioning arm and fixing rod used in the embodiments of this application;

[0062] Figure 11 This is a side view of the pre-mounted unit used in the embodiments of this application;

[0063] Figure 12 For along Figure 11 Cross-sectional view of the middle BB line;

[0064] Explanation of reference numerals in the attached drawings: 1. Stationary pointer; 11. Snap-fit ​​component; 2. Fixed rod; 21. Receiving groove; 3. Movable pointer; 4. Positioning element; 41. Tightening strap; 411. Fixed end; 412. Movable end; 42. Connecting plate; 421. Support arm; 5. Ranging assembly; 51. Infrared transmitter; 52. Infrared sensor; 6. Locking element; 61. Pressure plate; 611. Elastic rod; 62. Protrusion; 63. Locking screw; 7. Pre-installed seat; 71. Slot; 711. Groove; 72. Positioning arm; 721. Sliding arm; 722. Clamping arm; 723. Synchronous drive component; 8. Locking assembly; 81. Stop arm; 82. Spring; 9. Pre-installed plate; 91. Embedded hole; 100. Frame; 110. Swing arm; 120. Support frame; 200. Radiation source; 300. Treatment bed; 310. Reserved groove. Detailed Implementation

[0065] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0066] Please refer to the following: Figures 1 to 12 The mechanical rotation accuracy testing device for a medical linear accelerator provided in this application will now be described. The mechanical rotation accuracy testing device for a medical linear accelerator proposed in this application is used to be assembled between the frame 100 and the treatment bed 300. In this embodiment, for ease of description, the direction of the frame 100 toward the treatment bed 300 is defined as the front-to-back direction, and the width direction of the treatment bed 300 is defined as the left-right direction.

[0067] The medical linear accelerator mechanical rotation accuracy detection device described in this application includes a stationary pointer 1, a fixed rod 2, a movable pointer 3, and a ranging component 5.

[0068] The stationary pointer 1 is pre-mounted on the treatment bed 300, with its axis parallel to the front-rear direction, and one end adapted to extend from the front edge of the treatment bed 300. This design between the stationary pointer 1 and the treatment bed 300 serves two purposes: firstly, pre-mounting the stationary pointer 1 on the treatment bed 300 eliminates the need for assembly during each test, thus shortening the time required and improving the efficiency of each test; secondly, the stationary pointer 1 extends from the front edge of the treatment bed 300 during use, rather than being simply mounted on the bed surface, thus avoiding any impact on the normal operation of the treatment bed 300.

[0069] The fixing rod 2 is detachably mounted on the inner side of the support frame 120. It should be noted that the inner side refers to the side of the support frame 120 facing the radiation source 200. In this embodiment, after the fixing rod 2 is connected to the support frame 120, the axial direction of the fixing rod 2 is parallel to the orientation of the radiation source 200. Furthermore, the fixing rod 2 is adapted to have a receiving groove 21 extending axially along the fixing rod 2 at its end facing away from the support frame 120.

[0070] The movable pointer 3 is slidably disposed within the receiving groove 21 along the axial direction of the fixed rod 2, and its own axial direction is parallel to the axial direction of the fixed rod 2. The end of the movable pointer 3 within the receiving groove 21 is defined as the insertion end, and the other end as the extension end.

[0071] The insertion end of the active pointer 3 and the opening of the receiving slot 21 have an anti-dislodgement design, specifically as follows: Figure 9 As shown, the insertion end of the active pointer 3 has an outwardly extending disk structure, and the opening of the receiving groove 21 has an inwardly extending ring structure suitable for matching the disk structure.

[0072] The protruding end of the movable pointer 3 is adapted to extend from the opening of the receiving groove 21, and the protruding end is connected to a positioning element 4 adapted to be fitted around the periphery of the stationary pointer 1. It should be noted that after the positioning element 4 is fitted onto the stationary pointer 1, the movable pointer 3 can only rotate around the stationary pointer 1; if the distance between the support frame 120 and the stationary pointer 1 changes (that is, the distance between the radiation source 200 and the treatment bed 300 changes during rotation), the total length between the movable pointer 3 and the fixed rod 2 changes, that is, the distance between the insertion end of the movable pointer 3 and the bottom of the receiving groove 21 changes.

[0073] The ranging component 5 is set in the receiving groove 21 to detect the distance between the insertion end of the movable pointer 3 and the bottom of the receiving groove 21, and converts this distance into digital information output. Its output method is not limited to display on the screen or remote output of digital signals to mobile phones or other terminals. Its specific output method belongs to the prior art and will not be described in detail here.

[0074] In this embodiment, since the stationary pointer 1 and the fixed rod 2 are pre-installed on the treatment bed 300 and the support frame 120 respectively, the process of installing the stationary pointer 1 and the movable pointer 3 is eliminated, thus optimizing the efficiency of the mechanical rotation accuracy detection of the medical linear accelerator. Furthermore, during actual testing, the change in accuracy is reflected in the numerical change obtained by the ranging component 5, which can more intuitively reflect the test results and eliminate errors caused by manual observation; at the same time, the values ​​can be effectively recorded, facilitating subsequent analysis.

[0075] The medical linear accelerator mechanical rotation accuracy detection device provided in this embodiment, compared with the prior art, can perform an efficient detection process and obtain accurate and intuitive data results, which is convenient for subsequent recording and analysis.

[0076] In some embodiments, the feature positioning element 4 described above can be as follows: Figure 4 , Figure 6 , Figure 7 and Figure 8 The structure shown. See also Figure 4 , Figure 6 , Figure 7 and Figure 8 The positioning element 4 includes a tightening band 41 and a connecting plate 42.

[0077] The surface of the tightening band 41 is slidably connected to the movable pointer 3, and the sliding direction is parallel to the length direction of the tightening band 41. In this embodiment, when the protruding end of the movable pointer 3 is facing downward, the length direction of the tightening band 41 is parallel to the left and right direction, and at this time, both ends of the tightening band 41 are suitable to hang naturally to the left and right sides of the stationary pointer 1. For ease of description, the two ends of the tightening band 41 are defined as the fixed end 411 and the movable end 412, respectively.

[0078] The connecting plate 42 is connected to the fixed end 411 of the tightening strap 41, as shown in the figure below. Figure 4 river Figure 8 As shown, the two are fixedly connected by a hinge-like structure. The connecting plate 42 has two support arms 421, thus forming a door-shaped frame structure; in this embodiment, the two support arms 421 are distributed on both sides of the fixed end 411 of the tightening band 41 along the width direction of the tightening band 41, and both support arms 421 extend horizontally toward the side where the movable end 412 of the tightening band 41 is located.

[0079] A locking element 6 is provided between the two support arms 421 to press the surface of the tightening band 41 against the connecting plate 42, achieving the following technical objective: when both ends of the tightening band 41 are on the left and right sides of the stationary pointer 1, pressing the tightening band 41 with the locking element 6 while manually pulling the movable end 412 of the tightening band 41 allows the tightening band 41 to wrap around the outer peripheral wall of the stationary pointer 1, forming a ring-shaped positioning space. Compared to directly using a ring structure, this structure can accommodate stationary pointers 1 of different sizes and can be directly fitted onto the lower stationary pointer 1, thereby eliminating motion interference for the movable pointer 3 and optimizing the stability of this structure.

[0080] In some embodiments, the aforementioned locking element 6 may be employed as follows: Figure 6 and Figure 7 The structure shown. See also Figure 6 and Figure 7The locking element 6 includes a pressure plate 61, a protrusion 62, and a locking screw 63.

[0081] The pressure plate 61 is disposed between the two support arms 421 and can move toward the connecting plate 42 so as to abut against the outer surface of the receiving strap 41.

[0082] The protrusion 62 is fixedly connected to one of the support arms 421 and has a through threaded hole, the axis of which is parallel to the length direction of the support arm 421.

[0083] The locking screw 63 is located between the two support arms 421, and its axial direction is parallel to the length direction of the support arms 421. Furthermore, the locking screw 63 is threadedly connected to the threaded hole of the protrusion 62, and its end facing the connecting plate 42 is rotatably connected to the pressure plate 61 (thereby avoiding the rotational interference of the connecting plate 42 on the locking screw 63), and the rotation axis is parallel to the length direction of the support arm 421.

[0084] When the tightening belt 41 is between the pressure plate 61 and the connecting plate 42, rotating the locking screw 63 can cause the pressure plate 61 to move toward or away from the connecting plate 42, thereby clamping or loosening the tightening belt 41, which serves to manually adjust the tightness of the tightening belt 41 and limit its translational movement.

[0085] In some embodiments, the aforementioned locking element 6 may be employed as follows: Figure 7 The structure shown. See also Figure 7 The locking element 6 has two sets, which are respectively set on the two support arms 421, so that the force on the surface of the pressure plate 61 is more uniform and the movement is more stable.

[0086] There is a spring rod 611 between the two pressure plates 61, and when the spring rod 611 is in the normal state, the axis of the spring rod 611 is parallel to the arrangement direction of the two support arms 421.

[0087] The elastic rod 611 is designed for two purposes: firstly, to visually display the relative positions of the two support arms 421, meaning that the elastic rod 611 must be parallel during adjustment to indicate that the two pressure plates 61 have been positioned; secondly, to eliminate the need for intervention in the movement between the two pressure plates 61, so that adjustments can be made without simultaneously controlling the two locking screws 63, thus ensuring the efficiency and feasibility of single-person operation.

[0088] In some embodiments, please refer to the following: Figure 3 , Figure 10 , Figure 11 and Figure 12 The medical linear accelerator mechanical precision testing device also includes a pre-mounted base 7, a locking assembly 8, a positioning arm 72, and a synchronous drive component 723.

[0089] The pre-mounted base 7 is used for fixed installation on the outer side of the support frame 120. It is installed on the outer side to avoid interference with the normal use of the support frame 120 and the radiation source 200, thus eliminating the need for disassembly after testing and improving efficiency during each test. The side of the pre-mounted base 7 facing away from the support frame 120 has a slot 71, and the slot 71 is along the width direction of the support frame 120 (i.e., as shown in the image). Figure 2 As shown, when the inner side of the support frame 120 is arranged downwards, it extends through in the left and right directions.

[0090] The locking component 8 is disposed on the pre-installed base 7 and is used to close the opening of the slot 71 or to avoid the opening of the slot 71; wherein, when the locking component 8 closes the opening of the slot 71, the component inserted into the slot 71 cannot be dislodged; when the locking component 8 avoids the opening of the slot 71, some components can freely enter and exit the slot 71.

[0091] The positioning arm 72 is used to insert into the slot 71, and after the positioning arm 72 is inserted into the slot 71, the axial direction of the positioning arm 72 is parallel to the width direction of the support frame 120, and the two ends of the positioning arm 72 extend from the two end edges of the pre-mounted seat 7 in the length direction.

[0092] The positioning arm 72 has two sliding arms 721 slidably connected along its own axis. The two sliding arms 721 are distributed at intervals on both sides of the support frame 120 along the width direction of the support frame 120, and clamping arms 722 are integrally connected to the adjacent sides of the two sliding arms 721. When the positioning arm 72 is inserted into the slot 71, the two clamping arms 722 are located inside the support frame 120 to clamp the fixing rod 2.

[0093] The synchronous drive component 723 is mounted on the positioning arm 72 and connected to the two sliding arms 721. It is used to drive the two sliding arms 721 to move towards each other or away from each other. When the two sliding arms 721 move towards each other, the two clamping arms 722 are adapted to clamp the fixed rod 2, thereby connecting the fixed rod 2 and the support frame 120. Compared with the use of adhesive or other existing technologies, this structure realizes the quick assembly of the fixed rod 2, thereby realizing the quick assembly of the movable pointer 3 onto the frame 100.

[0094] In some embodiments, the aforementioned feature slot 71 and locking component 8 may employ, as follows: Figure 11 and Figure 12 The structure shown. See also Figure 11 and Figure 12 The inner wall of the slot 71 has a groove 711, and in this embodiment, the axial direction of the groove 711 is parallel to the length direction of the support frame 120. The length direction of the support frame 120 mentioned here specifically refers to the front-back direction defined in this embodiment.

[0095] The locking assembly 8 includes a stop arm 81 and a spring 82.

[0096] The stop arm 81 is slidably disposed in the groove 711 along the axial direction of the groove 711, and the stop arm 81 is adapted to extend out of the opening of the groove 711 or into the groove 711.

[0097] One end of the spring 82 is fixedly set at the bottom of the groove 711, with its axis parallel to the axis of the groove 711; the other end of the spring 82 is connected to the stop arm 81, specifically to the side of the stop arm 81 facing the bottom of the groove 711.

[0098] When the stop arm 81 extends into the groove 711, the stop arm 81 avoids the opening of the slot 71, and the spring 82 elastically contracts. When the stop arm 81 closes the opening of the slot 71, the spring 82 is in its normal state or elastically contracted state. That is to say, an external driving force can move the stop arm 81 to a position that avoids the opening of the slot 71, so as to ensure that the positioning arm 72 can be successfully placed into the slot 71. After the positioning arm 72 is placed into the slot 71, under the action of the spring 82, the stop arm 81 can return to the position that closes the opening of the slot 71 and abuts against the positioning arm 72, thereby preventing the positioning arm 72 from disengaging from the slot 71.

[0099] It should be added that, such as Figure 12 As shown, in this embodiment, there are two springs 82, and the arrangement direction of the two springs 82 is perpendicular to the axial direction of the groove 711. The reason for designing two springs 82 is to ensure the stability of the stop arm 81 during reset and the stability of the stop arm 81 during sliding. See also... Figure 12 The stop arm 81 is also integrally connected to two anti-bend rods, and the main bodies of the two anti-bend rods are respectively inserted into the two springs 82. One end of each anti-bend rod is fixedly connected to the side of the stop arm 81 facing the bottom of the groove 711, and the other end passes through the side of the bottom of the groove 711 and extends out for manual control (the extended parts of the two anti-bend rods are connected to a single handle for manual synchronous driving). In this embodiment, the function of the anti-bend rod is to limit the bending deformation of the spring 82 along its own radial direction and improve the stability of the spring 82 during use.

[0100] like Figure 11 As shown, the side of the stop arm 81 facing away from the bottom of the slot 71 is inclined, and the inclined surface is inclined toward the bottom of the slot 71 along the direction away from the bottom of the groove 711. During the process of placing the positioning arm 72 into the slot 71, the positioning arm 72 enters into the slot 71 through the opening and abuts against the inclined surface, thereby causing the stop arm 81 to retract into the groove 711, eliminating the need for manual driving and improving the convenience of using this component.

[0101] In some embodiments, the aforementioned feature synchronization drive component 723 may employ, as follows: Figure 10 The structure shown. See also Figure 10 The synchronous drive component 723 includes a double-ended screw, the two ends of which are rotatably connected to the two ends of the positioning arm 72, and the rotation axis is parallel to the axis of the positioning arm 72.

[0102] In this embodiment, both ends of the positioning arm 72 have outward-curving structures for rotatable connection with the double-ended screw. Furthermore, this curved structure also serves to prevent the sliding arm 721 from disengaging from the positioning arm 72, thus enhancing the stability of the structure.

[0103] The double-ended screw has two threaded portions with opposite thread directions, and the two threaded portions are respectively threaded to two sliding arms 721. When the double-ended screw rotates, the two sliding arms 721 move towards each other or away from each other, thereby reducing or increasing the distance between the two clamping arms 722, which achieves the effect of clamping or releasing the fixing rod 2.

[0104] In this embodiment, an intermediate component is integrally connected to the end of the fixing rod 2, and the intermediate component has two groove structures. These two groove structures are respectively adapted for the two clamping arms 722 to be embedded in, so as to enhance the stability of the connection structure between the fixing rod 2 and the clamping arms 722.

[0105] In some embodiments, to optimize the pre-installed structure of the stationary pointer 1 and the treatment bed 300, please refer to... Figure 4 and Figure 5 The medical linear accelerator mechanical precision testing device also includes a reserved slot 310, a pre-installed plate 9, and a snap-fit ​​component 11.

[0106] A pre-drilled slot 310 is provided on the front end face of the treatment bed 300, suitable for inserting the stationary pointer 1. Similarly, the opening of the pre-drilled slot 310 and the stationary pointer 1 also have an anti-dislodgement design, the specific structure of which is the same as the anti-dislodgement design structure between the movable pointer 3 and the receiving slot 21. Furthermore, in this embodiment, the treatment bed 300 adopts a movable bed board structure, and the pre-drilled slot 310 is provided on the front end face of the bed board to reduce structural damage to the main body of the treatment bed 300 and ensure the overall structural strength.

[0107] The pre-installed plate 9 is used to fix the front end face of the treatment bed 300. Its thickness and width are the same as the bed board of the treatment bed 300, and it has a recessed hole 91 suitable for communicating with the reserved slot 310.

[0108] The snap-fit ​​11 is fixedly connected to the protruding end of the stationary pointer 1 and is adapted to the recess 91.

[0109] In this embodiment, the stationary pointer 1 has a retracted state and an extended state, specifically:

[0110] When the stationary pointer 1 is in the retracted state, the locking member 11 is engaged within the recess 91. Because the locking member 11 and the recess 91 are compatible, friction is generated when they move relative to each other (specifically, when the stationary pointer 1 extends out of the reserved slot 310), thus preventing the stationary pointer 1 from extending out of the reserved slot 310 without external force. Simultaneously, adjusting the stationary pointer 1 to the retracted state ensures that its main body is concealed within the treatment bed 300, avoiding interference with the normal use of the treatment bed 300.

[0111] When the stationary pointer 1 is in the extended state, the snap-fit ​​part 11 is in front of the pre-installed plate 9. At this time, part of the stationary pointer 1 is outside the reserved slot 310 and can participate in the detection process to ensure the smooth progress of the detection process.

[0112] In some embodiments, the feature ranging component 5 described above can employ, for example... Figure 9 The structure shown. See also Figure 9 The ranging component 5 includes an infrared transmitter 51 and an infrared sensor 52.

[0113] Infrared emitter 51 is fixedly connected to the insertion end of movable pointer 3 so as to move synchronously with the movement of movable pointer 3. In this embodiment, infrared emitter 51 is used to generate an outgoing light path parallel to the axis of fixed rod 2, specifically, this outgoing light path is directed toward the bottom of receiving groove 21.

[0114] The infrared sensor 52 is fixedly connected to the bottom of the receiving groove 21, with its sensing end facing the infrared transmitter 51 to receive infrared light, thereby determining the distance between the bottom of the receiving groove 21 and the insertion end of the movable pointer 3. This process is in the prior art.

[0115] It should be noted that, in this embodiment, the infrared sensor 52 is also equipped with a display screen, which is electrically connected to the data output module of the infrared sensor 52 and can display the distance value after analysis by the infrared sensor 52; the display screen is fixedly installed on the outer end of the fixed rod 2 for on-site personnel to observe.

[0116] Based on the medical linear accelerator mechanical rotation accuracy testing device proposed above, this application embodiment also provides a method for testing the mechanical rotation accuracy of a medical linear accelerator, which includes the following steps:

[0117] (1) Mount the stationary pointer 1 onto the treatment bed 300, with one end extending from the front edge of the treatment bed 300; at the same time, mount the fixing rod 2 onto the support frame 120, with the axis of the fixing rod 2 parallel to the axis of the radiation source 200; normally, the fixing rod 2 is located at the center of the radiation source 200.

[0118] (2) Move the movable pointer 3 along the axis of the fixed rod 2 so that the extended end of the movable pointer 3 is close to the stationary pointer 1. Before this process, the support frame 120 can be adjusted to the position of the inner side facing downward so as to effectively utilize the gravity of the movable pointer 3, thereby facilitating the adjustment of the position of the movable pointer 3.

[0119] (3) Place the positioning element 4 around the stationary pointer 1, so that the stationary pointer 1 is at the rotation center of the moving pointer 3, record the value of the distance measuring component 5 at this time, and define this value as the standard value.

[0120] (4) Start the medical linear accelerator to make the support frame 120 rotate. During this rotation, manually observe whether the value of the ranging component 5 changes.

[0121] (5) In the previous step, if the value of the ranging component 5 remains at the standard value, it means that the frame 100 rotates according to the standard trajectory, the medical linear accelerator is undamaged, and it successfully passes the mechanical rotation accuracy test proposed in this application; if the value of the ranging component 5 changes, it is determined that the medical linear accelerator is damaged, and the test value obtained by the ranging component 5 is recorded.

[0122] Normally, if the test value is greater than the standard value, it indicates that the stationary pointer 1 exerts a pulling force on the moving pointer 3 during rotation, causing the moving pointer 3 to move away from the fixed rod 2. Therefore, it can be deduced that at the location where the value changes, the radiation source 200 will move outward away from the treatment bed 300, necessitating appropriate maintenance. Similarly, if the test value is greater than the standard value, it indicates that at the location where the value changes, the radiation source 200 will move inward towards the treatment bed 300.

[0123] The beneficial effects of the medical linear accelerator mechanical rotation accuracy detection method provided in this embodiment are the same as those of the aforementioned detection device. Both solve the problem that the detection data in the prior art cannot be statistically analyzed according to digital information, and play an auxiliary role in the subsequent recording and analysis process. They will not be elaborated further here.

[0124] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for detecting mechanical rotation accuracy of a medical linear accelerator, which is installed between a gantry and a treatment couch, and defines a direction of the gantry toward the treatment couch as a front-to-back direction, characterized in that, The medical linear accelerator mechanical rotation precision detection device comprises: a stationary pointer, which is pre-installed on the treatment bed, has an axial direction parallel to the front-rear direction, and has one end extending from the front edge of the treatment bed; a fixed rod, which is detachably installed on the inner side of the support frame, has an axial direction parallel to the direction of the radiation source, and has one end provided with a containing groove extending along the axial direction of the fixed rod; a movable pointer, which is slidingly arranged in the containing groove along the axial direction of the fixed rod, has an axial direction parallel to the axial direction of the fixed rod, and has one end adapted to extend from the opening of the containing groove and connected with a positioning element adapted to be sleeved on the outer periphery of the stationary pointer; and a distance measuring assembly, which is arranged in the containing groove, is used for detecting the distance between the insertion end of the movable pointer and the groove bottom of the containing groove; The positioning element comprises: a tightening belt, which is slidingly connected with the movable pointer and has a sliding direction parallel to the length direction of the tightening belt; the two ends of the tightening belt are adapted to naturally drop to the left and right sides of the stationary pointer, and define the two ends of the tightening belt as a fixed end and a movable end, respectively; and a connecting plate connected with the fixed end, and having two support arms distributed on the two sides of the fixed end along the width direction of the tightening belt and extending toward the side where the movable end is located; and a locking element arranged between the two support arms and used for pressing the surface of the tightening belt to the connecting plate. When the two ends of the tightening belt are respectively located on the left and right sides of the stationary pointer, the tightening belt can be wrapped on the outer peripheral wall of the stationary pointer by pressing the tightening belt through the locking element and manually pulling the movable end, so as to form an annular positioning space.

2. The medical linear accelerator mechanical rotation accuracy detection device of claim 1, wherein, The locking element comprises: a pressing plate arranged between the two support arms and used for abutting against the outer surface of the tightening belt; a protruding part fixedly connected with one of the support arms; and a locking screw between the two support arms, having an axial direction parallel to the length direction of the support arms; the locking screw is threadedly connected with the protruding part, and one end thereof is rotationally connected with the pressing plate, and the rotational axis is parallel to the length direction of the support arms. When the tightening belt is between the pressing plate and the connecting plate, rotating the locking screw can drive the pressing plate to move toward or away from the connecting plate, so as to clamp or release the tightening belt.

3. The medical linear accelerator mechanical rotation accuracy detection device of claim 2, wherein, The locking element has two groups and is arranged on the two support arms, respectively; the two pressing plates have a spring rod therebetween, and when the spring rod is in a normal state, the axial direction of the spring rod is parallel to the arrangement direction of the two support arms.

4. The medical linear accelerator mechanical rotation accuracy detection device of claim 1, wherein, The medical linear accelerator mechanical rotation precision detection device further comprises: a pre-install seat, which is fixedly installed on the outer side of the support frame; the side of the pre-install seat away from the support frame has an insertion slot, and the insertion slot penetrates through along the width direction of the support frame; a locking assembly arranged on the pre-install seat and used for closing the opening of the insertion slot or avoiding the opening of the insertion slot. A positioning arm is arranged to be inserted into the insertion slot and to be parallel to the width direction of the support frame in the axial direction; two sliding arms are slidably connected to the positioning arm in the axial direction, and the two sliding arms are spaced apart and arranged on both sides of the support frame in the width direction of the support frame; and clamping arms are integrally connected to the adjacent sides of the two sliding arms; when the positioning arm is inserted into the insertion slot, the two clamping arms are located on the inner side of the support frame; A synchronous driving member is arranged on the positioning arm and connected to the two sliding arms, and is used to drive the two sliding arms to move towards each other or away from each other; When the two sliding arms move towards each other, the two clamping arms are adapted to clamp the fixed rod.

5. The medical linear accelerator mechanical rotation accuracy detection device of claim 4, wherein, The inner slot wall of the insertion slot is provided with a groove, and the axial direction of the groove is parallel to the length direction of the support frame; the locking assembly comprises: A blocking arm is arranged in the groove in the axial direction of the groove and is adapted to extend out of the groove or into the groove; and A spring is arranged at one end of the groove and is parallel to the axial direction of the groove in the axial direction; the other end of the spring is connected to the blocking arm; When the blocking arm extends into the groove, the blocking arm avoids the opening of the insertion slot, and the spring is elastically contracted; when the blocking arm closes the opening of the insertion slot, the spring is in a normal state or an elastically contracted state.

6. The medical linear accelerator mechanical rotation accuracy detection device of claim 4, wherein, The synchronous driving member comprises: A double-headed screw is rotatably connected to both ends of the positioning arm, and the rotational axial directions of the double-headed screw are parallel to the axial direction of the positioning arm; The double-headed screw has two thread parts with opposite thread directions, and the two thread parts are threadedly connected to the two sliding arms, respectively, to drive the two sliding arms to move towards each other or away from each other.

7. The medical linear accelerator mechanical rotation accuracy detection device of claim 1, wherein, The medical linear accelerator mechanical rotation precision detection device further comprises: A reserved slot is arranged on the front end surface of the treatment bed and is adapted to be inserted by the stationary pointer; A preloading plate is fixedly connected to the front end surface of the treatment bed and has an embedded hole adapted to communicate with the reserved slot; and A clamping member is fixedly connected to the extending end of the stationary pointer and is adapted to the embedded hole; The stationary pointer has a retracted state in which the clamping member is embedded in the embedded hole, and has an extended state in which the stationary pointer moves from back to front so that the clamping member is located in front of the preloading plate.

8. The medical linear accelerator mechanical rotation accuracy detection device according to any one of claims 1 to 7, wherein The distance measuring assembly comprises: An infrared emitter is fixedly connected to the insertion end of the movable pointer and is adapted to move synchronously with the movable pointer; the infrared emitter is used to generate an outgoing light path parallel to the axial direction of the fixed rod; and An infrared sensor is fixedly connected to the bottom of the accommodating slot, and the sensing end of the infrared sensor is arranged towards the infrared emitter to receive the infrared light path.

9. A method for detecting the accuracy of the mechanical rotation of a medical linear accelerator, based on the medical linear accelerator mechanical rotation accuracy detection device according to any one of claims 1-8, characterized in that, The method comprises the following steps: (1) assembling the stationary pointer to the treatment bed so that one end of the stationary pointer extends from the front end edge of the treatment bed; and assembling the fixed rod to the support frame so that the axial direction of the fixed rod is parallel to the axial direction of the radiation source; (2) moving the movable pointer along the axial direction of the fixed rod so that the extending end of the movable pointer approaches the stationary pointer; (3) The positioning element is sleeved on the outer periphery of the stationary pointer, the value of the distance measuring assembly is recorded, and the value is defined as a standard value; (4) The medical linear accelerator is started to rotate the support frame, and whether the value of the distance measuring assembly changes is observed; (5) If the value of the distance measuring assembly remains the standard value, the medical linear accelerator is detected by mechanical rotation accuracy; if the value of the distance measuring assembly changes, it is determined that the medical linear accelerator is damaged, and the test value obtained by the distance measuring assembly is recorded.

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