Simulated positioning line drawing system for radiotherapy

Abstract

The invention relates to a radiotherapy simulation positioning line drawing system, which comprises a positioning driving mechanism and a line drawing mechanism, and is characterized in that the positioning driving mechanism is used for moving the line drawing mechanism to a radiotherapy positioning position, and the line drawing mechanism comprises a linear motor, a shell, a driving block, a transmission rod, a line drawing sliding block, a line drawing pen and a fixed seat; the linear motor is installed on the fixing base, the shell is installed on the fixing base in a sliding mode, the driving block is in driving connection with the telescopic motor, and the line drawing pen is installed on the line drawing sliding block. A cross-shaped guide rail is arranged at the end, away from the linear motor, of the shell, four line drawing sliding blocks are slidably installed on the cross-shaped guide rail, and the driving block is connected with the line drawing sliding blocks through a transmission rod and used for converting vertical movement of the driving block into horizontal movement of the line drawing sliding blocks. Compared with the prior art, the line drawing device has the advantages of high line drawing efficiency and precision and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, and in particular to a line drawing system for radiotherapy simulation positioning. BACKGROUND

[0002] In the radiotherapy process, simulation positioning is a key link between diagnosis and treatment, and its core goal is to accurately position the tumor target area to provide a reliable spatial reference for subsequent treatment planning and positioning implementation. Among them, after the doctor determines the position of the tumor target area, accurate and reliable line marking on the patient's body surface is the core technical basis for ensuring the geometric accuracy of subsequent treatment positioning and the repeatability between fractions, which is directly related to whether the tumor target area can be accurately irradiated and whether the surrounding normal tissues can be effectively protected, and has important significance for improving the efficacy of radiotherapy and reducing treatment side effects.

[0003] In current clinical practice, body surface marking mainly relies on manual marking technology, which uses laser positioning lines as a reference and is completed by manual operation. However, this traditional technology has fundamental limitations and faces two major technical challenges in actual application: first, manual line drawing is difficult to maintain the straight geometric characteristics of the marking line, and the marking line is prone to bending, shifting and other problems due to factors such as operator hand stability, operation strength, etc.; second, it cannot ensure the strict spatial coincidence of the marking line and the laser reference line, and visual judgment errors, operation timing deviations, etc. of the operator will cause spatial misalignment between the two.

[0004] The core root of the above technical defects lies in the high dependence of manual marking technology on the experience level and real-time operation state of the operator. The operation habits, experience differences of different operators, and the state fluctuations of the same operator at different operation times will introduce uncontrollable human errors, and such errors are systematic and cannot be eliminated by simple operation specification optimization.

[0005] Although the application No. CN201910513998.8 discloses a line drawing device, more specifically, a geometric line drawing device, including a round seat, a line drawing pen, a door-shaped frame, a spring sleeve rod, a sliding rail rod and a seat block, the line drawing pen is always perpendicular to the paper surface, compared with the manual line drawing, the line drawing pen will be irregularly inclined with the hand, the line drawing way perpendicular to the paper surface of the present application is more uniform. The line drawing pen is vertically and slidingly connected to the round seat, the upper end of the round seat is provided with the door-shaped frame, the spring sleeve rod is vertically and slidingly connected to the upper end of the door-shaped frame, the lower end of the spring sleeve rod is fixedly connected to the upper end of the line drawing pen, the spring sleeve rod is sleeved with the compression spring, the lower end of the spring sleeve rod is provided with the blocking block, the compression spring is located between the blocking block and the door-shaped frame, two sliding rail rods are fixedly connected between the two seat blocks, the left and right ends of the round seat are provided with the notches corresponding to the sliding rail rods, the round seat is slidingly connected to the two sliding rail rods, and the spring sleeve rod can be pulled to the upper end and fixed.

[0006] However, the above-mentioned existing line drawing device needs to be positioned and drawn lines multiple times to complete the marking and line drawing, the line drawing process is relatively complicated, which further leads to low line drawing efficiency and repeated positioning errors, and has an influence on the line drawing precision, therefore, it is necessary to provide a line drawing system for radiotherapy simulation positioning which can quickly and accurately draw lines. SUMMARY

[0007] The purpose of the present application is to overcome the defects of low line drawing efficiency and precision of the prior art, and to provide a line drawing system for radiotherapy simulation positioning which can quickly and accurately draw cross line marking points on the patient after the patient completes simulation positioning to determine the position of the tumor target area, as the reference line for positioning in radiotherapy.

[0008] The purpose of the present application can be achieved by the following technical solutions: A line drawing system for radiotherapy simulation positioning, comprising a positioning driving mechanism and a line drawing mechanism, the positioning driving mechanism is used to move the line drawing mechanism to a radiotherapy positioning position, The line drawing mechanism comprises a linear motor, a shell, a driving block, a transmission rod, a line drawing slider, a line drawing pen and a fixing seat; the linear motor is installed on the fixing seat, the shell is slidingly installed on the fixing seat, the driving block is drivingly connected to the extension motor, and the line drawing pen is installed on the line drawing slider; The end of the shell away from the linear motor is provided with a cross rail, four line drawing sliders are slidingly installed on the cross rail, the driving block is connected to the line drawing slider through the transmission rod, and the vertical movement of the driving block is converted into the horizontal movement of the line drawing slider.

[0009] Preferably, the shell comprises a top shell and a bottom shell, the bottom shell is in an annular structure, and the top shell is slidingly sleeved outside the bottom shell; The fixed seat is provided with a guide rod at the end away from the linear motor, the top shell is slidably installed on the guide rod, and an electromagnetic brake is arranged between the top shell and the guide rod, the cross rail is arranged on the bottom shell, and a first micro switch is arranged between the top shell and the bottom shell, when the first micro switch is triggered, the electromagnetic brake tightly embraces the guide rod.

[0010] Preferably, the end of the bottom shell away from the top shell is provided with an induction contact body, when the line drawing mechanism is in the initial position, the line drawing end of the line drawing pen is located in the bottom shell.

[0011] Preferably, the driving block comprises a moving core and a guide shell, the moving core is slidably arranged in the guide shell, the transmission rod is connected to the moving core, a first locking assembly is arranged between the guide shell and the shell for locking the guide shell, a second locking assembly is arranged between part of the line drawing slider and the shell for locking the line drawing slider, the first locking assembly and the second locking assembly act simultaneously, and the opening and closing states of the first locking assembly and the second locking assembly are opposite.

[0012] Preferably, the first locking assembly comprises a first locking rod and a first return spring, the inner side of the shell is provided with a positioning rod, and the positioning rod is provided with a positioning hole; The guide shell is provided with a limiting slot, the limiting slot is an inclined sliding groove, the first return spring is sleeved on the first locking rod and located at the side away from the guide shell, and the first return spring is in a compressed state; The first locking rod is slidably installed on the fixed seat, one end of the first locking rod is slidably connected in the limiting slot for adjusting the axial displacement of the first locking rod, the other end of the first locking rod is matched with the positioning hole, and with the elongation of the linear motor, the first locking rod is inserted into the positioning hole.

[0013] Preferably, the second locking assembly comprises a second locking rod, a second return spring and a limiting pin; One end of the second locking rod is provided with a plug matched with the locking hole, the other end is provided with a limiting sheet, the inside of the limiting pin is provided with a mounting hole matched with the second locking rod, and the second locking rod is slidably arranged in the mounting hole; The inner side of the shell is provided with a trapezoidal guide slot for driving the second locking rod, one end of the second locking rod close to the limiting sheet is provided with a transverse guide rod, and the opposite end is provided with a transverse limiting rod, the transverse guide rod is slidably arranged in the trapezoidal guide slot, the second return spring is sleeved on the limiting pin, one end of the second return spring abuts against the limiting sheet, and the other end abuts against the transverse limiting rod, with the elongation of the linear motor, the plug of the second locking rod is separated from the locking hole on the line drawing slider.

[0014] Preferably, the number of the primary locking assemblies is at least four, and each primary locking assembly is symmetrically installed on the two sides of the guide shell.

[0015] Preferably, the number of the secondary locking assemblies is four, each secondary locking assembly is parallel to each other, and the moving axis of the secondary locking assembly is perpendicular to the moving axis of the line drawing slider, and two secondary locking assemblies are arranged on the two sides of the two line drawing sliders in line.

[0016] Preferably, the cross guide rail is provided with an inverted T-shaped line drawing guide groove, the line drawing slider is slidably installed in the T-shaped line drawing guide groove, and the two sides of the line drawing slider are symmetrically provided with first transmission columns. The moving core is located on the central axis of the cross guide rail, and the four sides of the moving core are respectively provided with second transmission columns, and the first transmission columns on the two sides of the line drawing slider are connected to the second transmission columns through transmission rods.

[0017] Preferably, the four ends of the cross guide rail are respectively provided with second micro switches, when the line drawing slider triggers the second micro switch, the linear motor reverses the action, and the line drawing mechanism resets.

[0018] Compared with the prior art, the present application has the following advantages: (1) The present scheme realizes synchronous line drawing of the four line drawing sliders with the line drawing pen through the transmission rods, completes the drawing of the cross mark line of the positioning position through one positioning, improves the line drawing efficiency, and avoids the adjustment of the position of the line drawing pen after line drawing to realize the drawing of the whole line, thereby improving the line drawing precision and accuracy.

[0019] (2) The present scheme sets the line drawing pen in the shell, adjusts the movement of the line drawing pen by cooperating with the sensing contact body at the end of the shell, avoids the direct contact of the line drawing pen with the skin, causes no compression damage to the skin of the patient, improves the line drawing safety, and ensures the line drawing contact stability.

[0020] (3) In the present scheme, the driving block sets the double-layer mechanism of the guide shell and the moving core, locks the guide shell when driving the line drawing slider, guides the moving core, thereby ensuring the stability and accuracy of the movement of the line drawing pen, and in the non-line drawing stage, the line drawing slider is locked through the secondary locking assembly, ensures the stability of the line drawing pen driving structure, and further improves the positioning and line drawing precision. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure schematic view of the line drawing structure provided by the present application is shown in the figure. Figure 2 The structure schematic view of the first perspective view inside the line drawing mechanism shell provided by the present application is shown in the figure. Figure 3 Structure diagram of the second view angle inside the line drawing mechanism shell provided by the present application; Figure 4 Structure diagram of the third view angle inside the line drawing mechanism shell provided by the present application; Figure 5 Structure diagram of the line drawing mechanism shell after separating the guide shell provided by the present application; Figure 6 Structure diagram of the cross guide rail and the line drawing slider provided by the present application; Figure 7 Structure diagram of the secondary locking assembly provided by the present application; Figure 8 Exploded diagram of the secondary locking assembly provided by the present application; Figure 9 Structure diagram of the primary locking assembly provided by the present application; Figure 10 Structure diagram of the guide shell provided by the present application; In the figure: 1, linear motor, 2, shell, 3, driving block, 4, transmission rod, 5, line drawing slider, 6, line drawing pen, 7, fixed seat, 8, cross guide rail, 9, primary locking assembly, 10, secondary locking assembly, 11, second micro switch; 21, top shell, 22, bottom shell, 23, first micro switch, 24, sensing contact, 31, moving core, 32, guide shell, 71, guide rod, 72, electromagnetic brake, 91, primary locking rod, 92, primary return spring, 93, positioning rod, 94, positioning hole, 95, limiting groove, 101, secondary locking rod, 102, secondary return spring, 103, limiting bolt, 1031, plug, 1032, limiting sheet. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] Example 1 like Figures 1 to 6 As shown, this embodiment discloses a system for simulating and positioning radiotherapy lines, aiming to achieve accurate and stable line drawing on the body surface during radiotherapy positioning, providing a reliable positioning reference for subsequent treatment. The system includes a positioning drive mechanism and a line drawing mechanism. The positioning drive mechanism employs a three-axis linear module, which drives the line drawing mechanism to move in three-dimensional space, accurately reaching the target position required for radiotherapy positioning.

[0029] The line drawing mechanism is the core execution component. Its specific structure includes a linear motor 1, a housing 2, a drive block 3, a transmission rod 4, a line drawing slider 5, a line drawing pen 6, and a fixed base 7. The linear motor 1 is a coreless linear motor, model LM12050. Its stator is fixed to the center mounting hole at the bottom of the fixed base 7 by bolts, and the mover is rigidly connected to the drive block 3 to provide vertical driving power.

[0030] The top of the shell 2 is slidably mounted on the guide structure at the bottom of the fixed seat 7 by a linear bearing, achieving smooth sliding in the vertical direction. The drive block 3 is composed of a moving core 31 and a guide shell 32. The guide shell 32 is a cubic structure, fixed inside the top end of the shell 2 by bolts, with a linear bearing embedded in its inner wall. The moving core 31 is a cylindrical rod, slidingly arranged in the linear bearing of the guide shell 32, with the top threadedly connected to the mover of the linear motor 1 and the bottom extending to the middle region of the shell 2.

[0031] The bottom of the shell 2, away from the linear motor 1, is integrally formed with a cross rail 8, and the intersection of the cross rail 8 coincides with the central axis of the shell 2. The rail groove of the cross rail 8 adopts an inverted T-shaped structure for assembling the line drawing slider 5. The line drawing slider 5 is adapted to the T-shaped rail groove and can slide horizontally along the rail groove. Threaded holes are formed in the center of the bottom of each line drawing slider 5, and the line drawing pen 6 is fixed by a locking nut.

[0032] Four second transmission columns are evenly arranged around the bottom of the moving core 31, and two first transmission columns are symmetrically arranged on the inner side of each line drawing slider 5. Eight transmission rods 4 are respectively connected to the second transmission columns of the moving core 31 and the first transmission columns of each line drawing slider 5, achieving the conversion of vertical movement of the moving core 31 into horizontal movement of the line drawing slider 5.

[0033] In this embodiment, the shell 2 adopts a split structure, specifically including a top shell 21 and a bottom shell 22. The bottom shell 22 is an annular cylindrical structure, integrally formed with the cross rail 8 at the bottom and provided with an annular sliding groove on the inner side of the top. The top shell 21 is a rectangular shell, provided with an annular boss on the outer side of the bottom, which is adapted to the annular sliding groove of the bottom shell 22, so that the top shell 21 can be slidably arranged outside the bottom shell 22, achieving the relative sliding of the two.

[0034] In this embodiment, four guide rods 71 are evenly arranged at the bottom of the fixed seat 7 away from the linear motor 1, and the guide rods 71 are symmetrically distributed along the circumference of the fixed seat 7. Four guide holes are correspondingly arranged on the top of the top shell 21, each embedded with a linear bearing, and the top shell 21 is slidably mounted on the guide rods 71 by the linear bearings, achieving vertical sliding along the guide rods 71.

[0035] In this embodiment, an electromagnetic brake 72 is arranged between each guide rod 71 and the guide hole of the top shell 21, and the model is EB05. The stator of the electromagnetic brake 72 is fixed on the top shell 21, and the rotor is sleeved on the guide rod 71, which is used to lock the position of the top shell 21 on the guide rod 71.

[0036] In the embodiment, the first micro switch 23 is arranged between the top shell 21 and the bottom shell 22, and the model of the first micro switch 23 is KW123Z. The body of the first micro switch 23 is fixed to the bottom inner side of the top shell 21, and the trigger end of the first micro switch 23 faces the top end surface of the bottom shell 22. When the top shell 21 slides relative to the bottom shell 22 to a preset position, the top end surface of the bottom shell 22 extrudes the trigger end of the first micro switch 23, so that the first micro switch 23 is triggered. At this time, the electromagnetic brake 72 is powered to hold the guide rod 71, so that the positioning and locking of the top shell 21 are realized.

[0037] In the embodiment, the inductive contact body 24 is arranged at the bottom of the end of the bottom shell 22 away from the top shell 21. The inductive contact body 24 is made of rubber and is annularly attached to the bottom end surface of the bottom shell 22. When the drawing mechanism is in the initial position, the linear motor 1 is in the retracted state, the moving core 31 drives the drawing slider 5 to move to the center position of the cross guide rail 8, and at this time, the drawing end of the drawing pen 6 is located inside the bottom shell 22, so that the drawing pen 6 is prevented from being damaged in the non-working state.

[0038] In the embodiment, as shown in Figure 4 and Figure 5 , the guide shell 32 of the driving block 3 and the top shell 21 of the outer shell 2 are provided with a primary locking assembly 9, and part of the drawing slider 5 and the bottom shell 22 of the outer shell 2 are provided with a secondary locking assembly 10. The primary locking assembly 9 and the secondary locking assembly 10 act synchronously, and the opening and closing states of the two are opposite, that is, when the primary locking assembly 9 is locked, the secondary locking assembly 10 is unlocked, and vice versa.

[0039] In the embodiment, as shown in Figure 4 , Figure 9 and Figure 10As shown, the number of primary locking assemblies 9 is 4, each of which is symmetrically installed on both sides of the guide shell 32 and uniformly distributed in the circumferential direction; each primary locking assembly 9 comprises a primary locking rod 91, a primary reset spring 92 and a positioning rod 93. One end of the positioning rod 93 is fixed on the inner side wall of the bottom shell 22 by a bolt, and the other end extends to the outer side of the guide shell 32 in the horizontal direction, and the extension end of the positioning rod 93 is provided with a positioning hole 94, and the positioning rod 93 and the bottom shell 22 can be integrally formed. The outer side wall of the guide shell 32 is provided with a limiting groove 95 corresponding to the position of each primary locking assembly 9, and the limiting groove 95 is an inclined sliding groove with an inclination angle of 30°. The primary locking rod 91 is slidably installed in the guide rod at the bottom of the fixed seat 7, and one end thereof is provided with a boss on both sides near one end of the guide shell 32, which can be slidably connected in the limiting groove 95 for adjusting the axial displacement of the primary locking rod 91; the other end near one end of the positioning rod 93 is cylindrical and fits with the positioning hole 94. The primary reset spring 92 is sleeved on the primary locking rod 91 and located on the side away from the guide shell 32; after assembly, the primary reset spring 92 is in a compressed state, one end of which abuts against one side of the guide rod of the fixed seat 7, and the other end abuts against the annular step on the primary locking rod 91, thereby providing the primary locking rod 91 with a reset elastic force towards the guide shell 32.

[0040] Specifically, when the linear motor 1 is elongated, the moving core 31 drives the guide shell 32 to move downward, the inclined limiting groove 95 on the guide shell 32 is guided by the boss, so that the primary locking rod 91 moves in the axial direction towards the positioning rod 93, and finally one end of the primary locking rod 91 is inserted into the positioning hole 94, thereby realizing the locking of the guide shell 32 and the top shell 21; when the linear motor 1 is contracted, the guide shell 32 moves upward, the primary reset spring 92 pushes the primary locking rod 91 to move reversely and disengage from the positioning hole 94, thereby releasing the locking.

[0041] In this embodiment, as shown in Figures 6 to 8As shown, the number of secondary locking assemblies 10 is 4, each secondary locking assembly 10 is parallel to each other, and the moving axis of the secondary locking assembly 10 is perpendicular to the moving axis of the drawing slider 5; wherein two secondary locking assemblies 10 are arranged on both sides of the two collinear drawing sliders 5 on the cross rail 8. The secondary locking assembly 10 comprises a secondary locking rod 101, a secondary reset spring 102 and a limiting pin 103. A locking hole is formed on one side wall of the drawing slider 5, one end of the secondary locking rod 101 is provided with a plug 1031 matched with the locking hole, the other end is provided with a limiting sheet 1032, and the inside of the limiting pin 103 is provided with a mounting hole in the axial direction, and the secondary locking rod 101 is slidably arranged in the mounting hole. The inside wall of the bottom shell 22 of the shell 2 is provided with a trapezoidal guide groove corresponding to the position of each secondary locking assembly 10, the slope of the trapezoidal guide groove is 30°, which is used to drive the secondary locking rod 101 to move in the axial direction; the end of the secondary locking rod 101 close to the limiting sheet 1032 is provided with a transverse guide rod, which is slidably connected in the trapezoidal guide groove; the opposite end of the secondary locking rod 101 is provided with a transverse limiting rod. The secondary reset spring 102 is sleeved on the limiting pin 103, one end of which abuts against the limiting sheet 1032, and the other end abuts against the transverse limiting rod, and after assembly, the secondary reset spring 102 is in a compressed state, providing a reset elastic force for the limiting pin 103 towards the drawing slider 5.

[0042] Specifically, when the linear motor 1 is stretched, the moving core 31 drives the secondary locking rod 101 to move downward synchronously, the transverse guide rod of the secondary locking rod 101 slides in the trapezoidal guide groove, the slope of the trapezoidal guide groove pushes the transverse guide rod to drive the secondary locking rod 101 to move in the axial direction away from the drawing slider 5, thereby pulling the plug 1031 of the secondary locking rod 101 out of the locking hole on the drawing slider 5, realizing the unlocking of the secondary locking assembly 10; when the linear motor 1 is contracted, the secondary reset spring 102 pushes the limiting pin 103 to reset, the plug 1031 is inserted into the locking hole, realizing the locking of the drawing slider 5.

[0043] In this embodiment, as shown in the figure, Figure 6 The four ends of the cross rail 8, i.e. the two ends of the X-axis and Y-axis rails, are respectively provided with a second micro switch 11, the model is KW123Z, the body of the second micro switch 11 is fixed on the limiting block at the end of the rail by bolts, and the trigger end faces the moving direction of the drawing slider 5. When the drawing slider 5 moves to the limit position along the rail, the end of the slider presses the trigger end of the second micro switch 11, so that the second micro switch 11 sends a signal to the control system, and the control system controls the linear motor 1 to act reversely, drives the moving core 31 to contract, and then pulls the drawing slider 5 to move reversely along the rail through the transmission rod 4, and finally returns to the center position of the cross rail 8, realizing the reset of the drawing mechanism.

[0044] In combination with the specific structure described above, the embodiment provides a specific drawing process: S1: Initial state: Linear motor 1 is in the retracted state, primary locking component 9 is unlocked, secondary locking component 10 is locked, drawing slider 5 is located at the center of cross guide rail 8, drawing pen 6 is located inside bottom shell 22, and sensor contact 24 confirms the initial position.

[0045] S2: Positioning Movement: The three-axis linear module of the positioning drive mechanism is activated, and the entire mechanism with animated lines moves to the target position for radiotherapy positioning.

[0046] S3: Positioning and locking: The control system controls the linear motor 1 to extend, driving the top shell 21 to slide downward along the guide rod 71; when the top shell 21 slides to the preset position, the bottom shell 22 presses the first micro switch 23, the first micro switch 23 is triggered, the electromagnetic brake 72 is energized to hold the guide rod 71, and the position of the top shell 21 is locked.

[0047] S4: Locking switch: The linear motor 1 continues to extend, the guide shell 32 moves downward, pushing the first-level locking rod 91 into the positioning hole 94 of the positioning rod 93, and the first-level locking assembly 9 locks; at the same time, the second-level locking rod 101 drives the limit pin 103 to disengage from the locking hole of the drawing slider 5 under the action of the trapezoidal guide groove, and the second-level locking assembly 10 unlocks.

[0048] S5: Drawing action: The linear motor 1 extends continuously, the moving core 31 moves downward along the guide shell 32, and pushes the four drawing sliders 5 to slide outward synchronously along the X and Y axes of the cross guide rail 8 through the transmission rod 4, and the drawing pen 6 draws a cross-shaped positioning line on the patient's body surface.

[0049] S6: Reset and Recycling: When the line drawing slider 5 moves to the limit position and triggers the second micro switch 11, the control system controls the linear motor 1 to retract in the opposite direction, driving the moving core 31 to move upward; the transmission rod 4 pulls the line drawing slider 5 back to the center position, the secondary locking component 10 relocks the line drawing slider 5, and the primary locking component 9 unlocks; the linear motor 1 retracts to the initial state, the electromagnetic brake 72 is de-energized and unlocked, and the positioning drive mechanism takes the line drawing mechanism away from the positioning area, completing one line drawing operation.

[0050] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A system for simulating and marking positions in radiotherapy, comprising a positioning drive mechanism and a marking mechanism, wherein the positioning drive mechanism is used to move the marking mechanism to a radiotherapy positioning position, characterized in that, The line drawing mechanism includes a linear motor (1), a housing (2), a drive block (3), a transmission rod (4), a line drawing slider (5), a line drawing pen (6), and a fixed base (7); the linear motor (1) is mounted on the fixed base (7), the housing (2) is slidably mounted on the fixed base (7), the drive block (3) drives the telescopic motor (1), and the line drawing pen (6) is mounted on the line drawing slider (5); The outer casing (2) is provided with a cross guide rail (8) at the end away from the linear motor (1). Four line drawing sliders (5) are slidably mounted on the cross guide rail (8). The drive block (3) is connected to the line drawing sliders (5) through the transmission rod (4) to convert the vertical movement of the drive block (3) into the horizontal movement of the line drawing sliders (5).

2. The system for simulating and positioning radiotherapy lines according to claim 1, characterized in that, The outer shell (2) includes a top shell (21) and a bottom shell (22), and the bottom shell (22) is an annular structure, and the top shell (21) is slidably sleeved on the outside of the bottom shell (22); The fixed base (7) is provided with a guide rod (71) at the end away from the linear motor (1). The top shell (21) is slidably mounted on the guide rod (71), and an electromagnetic brake (72) is provided between the top shell (21) and the guide rod (71). The cross rail (8) is provided on the bottom shell (22). A first micro switch (23) is provided between the top shell (21) and the bottom shell (22). When the first micro switch (23) is triggered, the electromagnetic brake (72) grips the guide rod (71).

3. The system for simulating and positioning radiotherapy lines according to claim 2, characterized in that, The bottom shell (22) is provided with a sensor contact (24) at one end away from the top shell (21). When the drawing mechanism is in the initial position, the drawing end of the drawing pen (6) is located inside the bottom shell (22).

4. A system for simulating and positioning radiotherapy lines according to claim 1, characterized in that, The drive block (3) includes a movable core (31) and a guide shell (32). The movable core (31) is slidably disposed in the guide shell (32). The transmission rod (4) is connected to the movable core (31). A primary locking assembly (9) is provided between the guide shell (32) and the outer shell (2) for locking the guide shell (32). A secondary locking assembly (10) is provided between part of the drawing slider (5) and the outer shell (2) for locking the drawing slider (5). The primary locking assembly and the secondary locking assembly operate simultaneously, and the opening and closing states of the primary locking assembly and the secondary locking assembly are opposite.

5. A system for simulating and positioning radiotherapy lines according to claim 4, characterized in that, The first-stage locking assembly (9) includes a first-stage locking rod (91) and a first-stage return spring (92). The inner side of the outer shell (2) is provided with a positioning rod (93) and a positioning hole (94) is provided on the positioning rod (93). The guide shell (32) is provided with a limiting groove (95), the limiting groove (95) is an inclined sliding groove, the first-stage return spring (92) is sleeved on the first-stage locking rod (91) and located on the side away from the guide shell (32), the first-stage return spring (92) is in a compressed state; The first-level locking rod (91) is slidably mounted on the fixed base (7), and one end of the first-level locking rod (91) is slidably engaged in the limiting groove (95) for adjusting the axial displacement of the first-level locking rod (91). The other end of the first-level locking rod (91) is engaged with the positioning hole (94). As the linear motor (1) extends, the first-level locking rod (91) is inserted into the positioning hole (94).

6. A system for simulating and positioning radiotherapy lines according to claim 4, characterized in that, The secondary locking assembly (10) includes a secondary locking rod (101), a secondary return spring (102), and a limiting pin (103). The line drawing slider (5) has a locking hole on one side. One end of the secondary locking rod (101) has a plug (1031) that matches the locking hole, and the other end has a limiting piece (1032). The limiting pin (103) has an installation hole that matches the secondary locking rod (101). The secondary locking rod (101) can be slidably set in the installation hole. The inner side of the outer shell (2) is provided with a trapezoidal guide groove for driving the secondary locking rod (101). The secondary locking rod (101) has a transverse guide rod at one end near the limiting piece and a transverse limiting rod at the opposite end. The transverse guide rod is slidably disposed in the trapezoidal guide groove. The secondary reset spring (102) is sleeved on the limiting pin (103), and one end of the secondary reset spring (102) abuts against the limiting piece (1032) and the other end abuts against the transverse limiting rod. As the linear motor (1) extends, the plug (1031) of the secondary locking rod (101) disengages from the locking hole on the drawing slider (5).

7. A system for simulating and positioning radiotherapy lines according to claim 4, characterized in that, The number of the primary locking components (9) is at least four, and each primary locking component (9) is symmetrically installed on both sides of the guide shell (32).

8. A system for simulating and positioning radiotherapy lines according to claim 4, characterized in that, The number of the secondary locking components (10) is four. Each secondary locking component (10) is parallel to each other, and the moving axis of the secondary locking component (10) is perpendicular to the moving axis of the drawing slider (5). Two secondary locking components (10) are respectively provided on both sides of the two collinear drawing sliders (5).

9. A system for simulating and positioning radiotherapy lines according to claim 4, characterized in that, The cross guide rail (8) is provided with an inverted T-shaped line drawing guide groove, and the line drawing slider (5) is slidably installed in the T-shaped line drawing guide groove. The two sides of the line drawing slider (5) are symmetrically provided with first transmission columns. The movable core (31) is located on the central axis of the cross guide rail (8). The movable core (31) is provided with second transmission columns around its perimeter. The first transmission columns on both sides of the drawing slider (5) are connected to the second transmission columns through transmission rods (4).

10. A system for simulating and positioning radiotherapy lines according to claim 1, characterized in that, The four ends of the cross guide rail (8) are respectively provided with a second micro switch (11). When the drawing slider (5) triggers the second micro switch (11), the linear motor reverses and the drawing mechanism is reset.

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