Positioning fixator for upper limb radiotherapy

Abstract

The utility model relates to a positioning fixer for upper limb radiotherapy, which belongs to the technical field of medical instruments and is used for solving the problem that upper limbs are difficult to position consistently during multiple times of radiotherapy. The utility model relates to a positioning fixer for upper limb radiotherapy. The positioning fixer comprises a bottom plate and an adjustable fixer, the customized assembly of the adjustable fixator is manufactured through 3D printing and wraps the upper limb of the human body. The customization assembly is installed above the fixator base through the multiple sets of supporting assemblies, and the height of the customization assembly can be adjusted. Two groups of positioning grooves, positioning lines and scale marks are arranged on the bottom plate and the fixer base, so that the fixer base is transversely and longitudinally positioned on the bottom plate; the clamping and positioning assembly penetrates through the two positioning grooves which are perpendicular to each other, and the fixator base is clamped and fixed to the bottom plate. The positioning fixer for upper limb radiotherapy can position the upper limb joint of a human body, and can adjust the height and the position of the positioner to keep the upper limb position consistency after multiple times of radiotherapy.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially, it is a kind of positioning fixer for upper limb radiotherapy. BACKGROUND

[0002] At present, the three major methods of treating malignant tumor are mainly surgical resection, chemotherapy and radiotherapy. Among them, radiotherapy is a kind of local treatment method using radiotherapy to treat tumor. Before radiotherapy, the patient needs to cooperate with the doctor to carry out radiotherapy positioning. With the help of imaging examination equipment such as CT and MRI, the position and size of tumor are accurately understood, so that more accurate treatment plan is made. In order to achieve this goal, the doctor must use some auxiliary materials to fix the radiotherapy site at the same time of positioning. The treatment cycle of radiotherapy is 20-30 times, and the span is 1-2 months. In each subsequent radiotherapy, the consistency of body position needs to be ensured, and the same fixing device is used to fix the radiotherapy site, so as to avoid the movement of body position of the patient during radiotherapy process affecting the dose of irradiation field.

[0003] However, the existing radiotherapy positioning fixing device such as thermoforming mold and vacuum pad can only meet the requirements of head and neck radiotherapy and body radiotherapy fixation. For the upper limb part of the human body with large amplitude of movement, multiple joints and multiple positions need to be fixed, and the height and position of upper limb need to be fixed. When the human body is placed naturally after lying flat, it is difficult to achieve the consistency of body position every time. Thermoforming mold and vacuum pad can only meet the body position fixation of one position, and cannot meet the comprehensive positioning of multiple joints (shoulder joint, elbow joint, wrist joint) and multiple positions.

[0004] Therefore, it is necessary to provide a positioning fixer for upper limb radiotherapy, which is used for fixing and positioning the upper limb of the patient and ensuring the same body position of the upper limb during multiple fixations. UTILITY MODEL CONTENT

[0005] In view of the above analysis, the utility model aims at providing a positioning fixer for upper limb radiotherapy, to solve the problem that the existing radiotherapy positioning fixing device cannot ensure the consistency of multiple radiotherapy positioning.

[0006] The purpose of the utility model is mainly realized through the following technical solutions:

[0007] The application discloses a positioning fixer for upper limb radiotherapy, which comprises a base plate and an adjustable fixer; the adjustable fixer comprises a customized component, a fixer base, a clamping positioning component and a supporting component; the customized component is installed above the fixer base through a plurality of groups of supporting components, and the height of the supporting component is adjustable; the base plate is provided with a first positioning groove, a first positioning line and a first scale line; the fixer base is provided with a second positioning groove, a second positioning line and a second scale line; the first positioning groove and the second positioning groove are perpendicular to each other; the clamping positioning component clamps and fixes the fixer base on the base plate through the first positioning groove and the second positioning groove; when the adjustable fixer is fixed on the base plate, the first positioning line is aligned with the scale on the second scale line, and the second positioning line is aligned with the scale on the first scale line.

[0008] Further, the customized component is made through 3D printing and is used for fixing the upper limb joints by being wrapped on the outside of the upper limb of the human body; the customized component is a split structure and comprises a first fitting plate and a second fitting plate; the first fitting plate can be fitted with the upper surface of the upper limb of the human body; the second fitting plate can be fitted with the lower surface of the upper limb of the human body; the shapes of the first fitting plate and the second fitting plate are determined according to the shape of the upper limb of the human body obtained through three-dimensional scanning.

[0009] Further, the clamping positioning component comprises a positioning base, a rotating positioning cylinder and a positioning stud; the positioning stud is fixedly installed above the positioning base and is perpendicular to the positioning base; the rotating positioning cylinder can be screwed with the positioning stud; when the rotating positioning cylinder is screwed with the positioning stud, the fixer base and the base plate can be clamped between the positioning base and the rotating positioning cylinder.

[0010] Further, the upper end of the supporting component is detachably connected with the customized component, and the lower end of the supporting component is detachably connected with the fixer base.

[0011] Further, the supporting component comprises a lower supporting sleeve, an upper supporting column and a clamping screw sleeve; the lower end of the upper supporting column is slidingly inserted into the inside of the lower supporting sleeve; the upper end of the lower supporting sleeve is provided with a clamping fin and a threaded pipe; when the clamping screw sleeve is screwed with the threaded pipe, the clamping screw sleeve extrudes the clamping fin, and the clamping fin can clamp and fix the upper supporting column.

[0012] Further, the threaded pipe is arranged above the clamping fin and is an integral structure with the clamping fin; the clamping screw sleeve is provided with an internal thread, and the outer surface of the threaded pipe is provided with an external thread.

[0013] Further, the outer side of the lower support sleeve is provided with a clamping groove; the clamping fin is arranged in the clamping groove, and the outer surface of the clamping fin protrudes from the outer surface of the lower support sleeve.

[0014] Further, the clamping fins are arranged at equal intervals along the circumferential direction of the lower support sleeve.

[0015] Further, the lower surface of the customized assembly is provided with a plurality of insertion sleeves; the insertion sleeves can be insertedly connected with the upper support column.

[0016] Further, the lower end of the lower support sleeve is provided with a mounting stud; the fixing base is provided with a plurality of threaded mounting holes; the mounting stud is screwed in the threaded mounting hole.

[0017] Further, the first positioning line is arranged parallel to the first positioning groove; the second positioning line is arranged parallel to the second positioning groove; the first scale line is arranged on the upper surface of the bottom plate, and the extension direction thereof is arranged parallel to the first positioning groove; the second scale line is arranged on the side surface of the second positioning groove, and the extension direction thereof is arranged parallel to the second positioning groove.

[0018] The technical scheme of the utility model can at least realize one of the following effects:

[0019] 1. The positioning fixing device for upper limb radiotherapy of the utility model is provided with mutually perpendicular first positioning grooves and second positioning grooves on the bottom plate and the fixing base respectively, and installs the clamping positioning assembly in the first positioning groove and the second positioning groove to fix and install the adjustable fixing device on the bottom plate, can move the adjustable fixing device position according to the height, body shape, fat or thin of the patient, and can raise or lower the height of the customized assembly according to the radiotherapy requirement of the lesion position through the height adjustment of the support assembly, realize the adjustment of the fixed position and the fixed height of the upper limb of the patient, and adapt to the body position requirement of the patient during radiotherapy positioning.

[0020] 2. The positioning fixing device for upper limb radiotherapy of the utility model, after three-dimensional scanning of the upper limb of the patient, the customized assembly that is combined with the upper limb is made through 3D printing technology; the customized assembly can be customized according to the characteristics and position of the upper limb of the patient, can realize the surrounding (half surrounding or full surrounding) fixation of the upper limb, and is fixed accurately and reliably; and the first positioning line and the first scale line are arranged on the bottom plate, the second positioning line and the second scale line are arranged on the fixing base, the installation position of the adjustable fixing device on the bottom plate can be positioned through the two groups of positioning lines and scale lines, and then the consistent position of multiple radiotherapies is realized through the record of the installation position of the adjustable fixing device.

[0021] 3.The positioning fixer for upper limb radiotherapy of the utility model, when the patient's upper limb carries out multiple radiotherapy treatment, through two groups of positioning lines and scale lines can record the installation position of adjustable positioner on the bottom plate, keep the position of adjustable positioner on the bottom plate consistent in the process of multiple radiotherapy, and then can through the customized assembly cladding on the outside of upper limb to position the upper limb joint of the patient (elbow joint, wrist joint), adopt the positioning line and scale line positioning to realize the positioning of adjustable fixer, and combine the three-dimensional scanning personalized customized assembly to position the upper limb posture, can keep the consistency of the treatment position of multiple radiotherapy patients, ensure the treatment effect.

[0022] In the utility model, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the utility model will be described in the subsequent specification, and some advantages can become apparent from the specification or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the contents specifically pointed out in the specification and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings are only used for the purpose of showing specific embodiments and are not considered as limiting the utility model, and the same reference signs represent the same parts throughout the drawings.

[0024] Figure 1 It is a structure schematic view of the positioning fixer for upper limb radiotherapy of the utility model;

[0025] Figure 2 It is a top view of the positioning fixer for upper limb radiotherapy of the utility model;

[0026] Figure 3 It is a partial enlarged view of the positioning fixer for upper limb radiotherapy of the utility model;

[0027] Figure 4 It is a structure schematic view of the adjustable fixer of the positioning fixer for upper limb radiotherapy of the utility model;

[0028] Figure 5 It is a structure schematic view of the clamping positioning assembly of the adjustable fixer in Figure 4

[0029] It is a structure schematic view of the support assembly of the adjustable fixer in Figure 6 Figure 4 It is a structure schematic view of the support assembly omitting the clamping screw sleeve in

[0030] Figure 7 Figure 6

[0031] Reference signs:

[0032] ​​​1-base plate; 2-adjustable fixator;

[0033] 101-first positioning slot; 102-first positioning line; 103-first scale line;

[0034] 201-first fitting plate; 202-second fitting plate; 203-fixator base; 204-clamping positioning assembly; 205-supporting assembly; 206-second positioning slot; 207-second positioning line; 208-threaded mounting hole; 209-second scale line;

[0035] 2041-positioning base; 2042-rotary positioning cylinder; 2043-positioning stud;

[0036] 2051-lower supporting sleeve; 2052-upper supporting column; 2053-clamping screw; 2054-mounting stud; 2055-clamping fin; 2056-threaded pipe; 2057-clamping groove. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of the present application and serve to explain the principles of the present application together with the embodiments of the present application, but are not intended to limit the scope of the present application.

[0038] Embodiment 1

[0039] One specific embodiment of the present application discloses a positioning fixator for upper limb radiotherapy, as shown in Figure 1 、 Figure 2 、 Figure 3 , which comprises a base plate 1 and an adjustable fixator 2; the adjustable fixator 2 comprises a customized assembly, a fixator base 203, a clamping positioning assembly 204 and a supporting assembly 205.

[0040] Specifically, the customized assembly is made by 3D printing, the customized assembly is installed above the fixator base 203 through a plurality of supporting assemblies 205, and the height of the supporting assembly 205 is adjustable.

[0041] Specifically, the base plate 1 is provided with a first positioning slot 101 (a longitudinal sliding groove), a first positioning line 102 and a first scale line 103.

[0042] Specifically, the second positioning slot 206 (transverse sliding slot), the second positioning line 207 and the second scale line 209 are arranged on the fixator base 203; the first positioning slot 101 is perpendicular to the second positioning slot 206; the clamping positioning assembly 204 passes through the first positioning slot 101 and the second positioning slot 206, and the clamping positioning assembly 204 can clamp and fix the fixator base 203 on the bottom plate 1; in this embodiment, before the clamping positioning assembly 204 clamps and fixes the fixator base 203 and the bottom plate 1, the clamping positioning assembly 204 can slide in the first positioning slot 101 (longitudinal sliding slot) and the second positioning slot 206 (transverse sliding slot), and the positional relationship between the fixator base 203 and the bottom plate 1 can be adjusted at will; after the adjustment is completed, the clamping positioning assembly 204 can fix the two.

[0043] Specifically, as shown in Figure 3 , when the adjustable fixator 2 is fixed to the bottom plate 1, the first positioning line 102 is aligned with the scale on the second scale line 209, and the second positioning line 207 is aligned with the scale on the first scale line 103.

[0044] Specifically, the customized assembly is a contour structure that is made according to the outer contour of the skin of the upper limb of the human body and is formed by 3D printing to completely fit the upper limb of the patient. It is used to fix the joints of the upper limb by wrapping the outside of the upper limb of the human body.

[0045] As shown in Figure 3 , Figure 4 , the customized assembly includes a first fitting plate 201 and a second fitting plate 202, and a model structure is formed according to three-dimensional data of the skin contour of the upper limb of the patient and is formed by 3D printing. The three-dimensional data is obtained by scanning the upper limb of the patient using a three-dimensional scanner. Further, in order to realize the connection of the first fitting plate 201 and the second fitting plate 202, a clamping structure or a connecting band is arranged on the first fitting plate 201 and the second fitting plate 202, so as to realize the connection of the first fitting plate 201 and the second fitting plate 202 as a whole, and completely fit the upper limb of the patient.

[0046] Specifically, the bottom plate 1 is a carbon fiber plate fixed on a CT, MRI or other imaging device. Preferably, the patient's body position and posture are marked on the carbon fiber plate during use to ensure consistency of multiple radiotherapy.

[0047] Preferably, the adjustable fixator 2 is provided with one or more on the bottom plate 1 to realize the fixation and positioning of the patient.

[0048] As shown in Figure 1 , Figure 2As shown, the first positioning line 102 is parallel to the first positioning groove 101; the second positioning line 207 is parallel to the second positioning groove 206; the first scale line 103 is arranged on the upper surface of the bottom plate 1, and its extending direction is parallel to the first positioning groove 101; the second scale line 209 is arranged on the side of the second positioning groove 206, and its extending direction is parallel to the second positioning groove 206.

[0049] Preferably, in order to adapt to patients of different heights and body shapes, a plurality of groups of first positioning grooves 101 are arranged on the bottom plate 1; each group of first positioning grooves 101 is arranged in parallel along the width direction of the bottom plate 1 and at least three first positioning grooves 101 are arranged in parallel along the length direction of the bottom plate 1.

[0050] Preferably, in order to facilitate the installation of the fixator base 203 on the bottom plate 1, a plurality of second positioning grooves 206 are arranged in parallel on the fixator base 203 in this embodiment.

[0051] Specifically, the second scale line 209 is arranged on the side of the second positioning groove 206; the first positioning line 102 extends from one end of the bottom plate 1 to the other end in the length direction of the bottom plate 1. In implementation, by observing the specific scale of the second scale line 209 aligned by the first positioning line 102, the position of the fixator base 203 in the width direction of the bottom plate 1 can be accurately positioned, and transverse position positioning is realized.

[0052] Specifically, the first scale line 103 is arranged on the side of the length direction of the bottom plate 1, as shown in Figure 1 Further, the second positioning line 207 is arranged perpendicular to the side of the length direction of the fixator base 203, and the second positioning line 207 is arranged perpendicular to the extending manner of the first scale line 103; in implementation, by observing the specific scale of the first scale line 103 aligned by the second positioning line 207, the position of the fixator base 203 in the length direction of the bottom plate 1 can be accurately positioned, and longitudinal position positioning is realized.

[0053] As shown in Figure 3 , Figure 4 The custom assembly is a split structure, including a first fitting plate (201) and a second fitting plate 202; the first fitting plate 201 can be fitted with the upper surface of the upper limb of the human body; the second fitting plate 202 can be fitted with the lower surface of the upper limb of the human body; the shape of the first fitting plate 201 and the second fitting plate 202 is determined according to the shape of the upper limb of the human body obtained by three-dimensional scanning.

[0054] As shown in Figure 5As shown, the clamping positioning assembly 204 comprises a positioning base 2041, a rotating positioning cylinder 2042 and a positioning stud 2043; the positioning stud 2043 is fixedly installed above the positioning base 2041 and is perpendicular to the positioning base 2041; the rotating positioning cylinder 2042 can be screwed with the positioning stud 2043; when the rotating positioning cylinder 2042 is screwed with the positioning stud 2043, the fixator base 203 and the bottom plate 1 can be clamped between the positioning base 2041 and the rotating positioning cylinder 2042.

[0055] Specifically, the support assembly 205 is connected between the fixator base 203 and the customization assembly, the height of the support assembly 205 is adjustable, and the height of the customization assembly can be adjusted.

[0056] In this embodiment, as shown in the figure, Figure 6 , Figure 7 As shown, the support assembly 205 comprises a lower support sleeve 2051, an upper support column 2052 and a clamping nut 2053; the lower end of the upper support column 2052 is slidingly inserted into the inside of the lower support sleeve 2051; the upper end of the lower support sleeve 2051 is provided with a clamping fin 2055 and a threaded tube 2056; the threaded tube 2056 is arranged above the clamping fin 2055 and is an integral structure with the clamping fin 2055; the clamping nut 2053 is screwed with the threaded tube 2056; when the clamping nut 2053 is screwed with the threaded tube 2056, the clamping nut 2053 extrudes the clamping fin 2055, and the clamping fin 2055 can clamp and fix the upper support column 2052.

[0057] In implementation, the clamping fin 2055 can be released by loosening the clamping nut 2053 upward, at this time the upper support column 2052 can slide relative to the lower support sleeve 2051 to realize the height adjustment of the customization assembly; after the height adjustment of the customization assembly is completed, the clamping nut 2053 is tightened downward, the clamping nut 2053 is gradually screwed on the threaded tube 2056, the lower end of the clamping nut 2053 gradually presses the clamping fin 2055, the clamping fin 2055 is pressed into the clamping groove 2057, and the clamping fin 2055 clamps the upper support column 2052 inward to realize the relative fixation of the upper support column 2052 and the lower support sleeve 2051.

[0058] Further, as shown in the figure, Figure 6 , Figure 7 The outer side of the lower support sleeve 2051 is provided with a clamping groove 2057; the clamping fin 2055 is arranged in the clamping groove 2057, and the outer surface of the clamping fin 2055 protrudes from the outer surface of the lower support sleeve 2051.

[0059] Specifically, multiple clamping fins 2055 are evenly spaced along the circumferential direction of the lower support sleeve 2051.

[0060] Furthermore, the upper end of the support component 205 is detachably connected to the customized component, and the lower end of the support component 205 is detachably connected to the fixture base 203.

[0061] like Figure 4 As shown, the lower surface of the customized component is provided with multiple insertion sleeves; the insertion sleeves can be inserted and connected to the upper support column 2052. Preferably, the lower part of the second fitting plate 202 of the customized component is provided with 3-5 insertion sleeves as fixing ports for the upper support column 2052, thereby realizing the connection between the customized component and the fixator base 203 through the support component, and the height of the support component 205 can be adjusted by the relative sliding of the upper support column 2052 and the lower support sleeve 2051 of the support component 205, thereby realizing the height adjustment of the customized component, and ultimately realizing the adjustment of the height of the patient's upper limb.

[0062] like Figure 6 As shown, the lower end of the lower support sleeve 2051 is provided with a mounting stud 2054; the fixing base 203 is provided with a plurality of threaded mounting holes 208; the mounting stud 2054 is screwed into the threaded mounting holes 208 by threads.

[0063] This invention discloses a positioning and fixation device for upper limb radiotherapy. Before radiotherapy positioning, a customized component is created by scanning the upper limb contour with a 3D scanner to reconstruct a 3D model, which is then pre-printed using a 3D printer. This personalized component perfectly conforms to the patient's upper limb skin, ensuring accurate fixation. During radiotherapy positioning, the printed customized component is fixed to the upper limb and connected to an adjustable-height support component 205. The height of the customized component is adjusted using the adjustable-height support component 205. Furthermore, by sliding the fixation base 203 relative to the base plate 1 in all directions, the installation position of the adjustable fixation device 2 on the base plate 1 can be adjusted, thereby adjusting the abduction and height positions of the upper limb. The adjusted scale values ​​are recorded for subsequent radiotherapy positioning, ensuring consistency across multiple radiotherapy sessions. During radiotherapy, the upper limb is wrapped and fixed by the first and second bonding plates 201 of the customized components, which can ensure that the elbow and wrist joints of the upper limb are relatively fixed and will not move. The separate fixation device can ensure the elevation and abduction of the shoulder joint of the upper limb, ultimately ensuring the accuracy of the fixation position of the upper limb during radiotherapy and ensuring the therapeutic effect of radiotherapy.

[0064] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A positioning and fixation device for upper limb radiotherapy, characterized in that, include: Base plate (1) and adjustable fastener (2); The adjustable fastener (2) includes: a custom component, a fastener base (203), a clamping and positioning component (204), and a support component (205); the custom component is mounted above the fastener base (203) via multiple sets of support components (205), and the height of the support components (205) is adjustable; the base plate (1) is provided with a first positioning groove (101), a first positioning line (102), and a first scale line (103); the fastener base (203) is provided with a second positioning groove (206), a second positioning line (207), and a first scale line (205). Two scale lines (209); the first positioning groove (101) and the second positioning groove (206) are perpendicular to each other; the clamping positioning component (204) passes through the first positioning groove (101) and the second positioning groove (206) to clamp and fix the fixture base (203) on the base plate (1); when the adjustable fixture (2) is fixed to the base plate (1), the first positioning line (102) is aligned with the scale on the second scale line (209), and the second positioning line (207) is aligned with the scale on the first scale line (103).

2. The positioning and fixation device for upper limb radiotherapy according to claim 1, characterized in that, The customized component is manufactured by 3D printing and is used to cover the outside of the human upper limb to fix the upper limb joint; the customized component includes: a first bonding plate (201) and a second bonding plate (202); the first bonding plate (201) can be bonded to the upper surface of the human upper limb; the second bonding plate (202) can be bonded to the lower surface of the human upper limb.

3. The positioning and fixation device for upper limb radiotherapy according to claim 2, characterized in that, The clamping and positioning assembly (204) includes: a positioning base (2041), a rotating positioning cylinder (2042), and a positioning stud (2043); the positioning stud (2043) is fixedly installed above the positioning base (2041) and perpendicular to the positioning base (2041); the rotating positioning cylinder (2042) can be screwed onto the positioning stud (2043); when the rotating positioning cylinder (2042) is screwed onto the positioning stud (2043), the fixture base (203) and the base plate (1) can be clamped between the positioning base (2041) and the rotating positioning cylinder (2042).

4. The positioning and fixation device for upper limb radiotherapy according to claim 3, characterized in that, The upper end of the support component (205) is detachably connected to the customized component, and the lower end of the support component (205) is detachably connected to the fixture base (203).

5. The positioning and fixation device for upper limb radiotherapy according to claim 4, characterized in that, The support assembly (205) includes: a lower support sleeve (2051), an upper support column (2052), and a clamping screw sleeve (2053); the lower end of the upper support column (2052) is slidably inserted into the interior of the lower support sleeve (2051); the upper end of the lower support sleeve (2051) is provided with a clamping fin (2055) and a threaded tube (2056); when the clamping screw sleeve (2053) is screwed into the threaded tube (2056), the clamping screw sleeve (2053) squeezes the clamping fin (2055), and the clamping fin (2055) can clamp and fix the upper support column (2052).

6. The positioning and fixation device for upper limb radiotherapy according to claim 5, characterized in that, The threaded tube (2056) is positioned above the clamping fin (2055) and is an integral part of the clamping fin (2055).

7. The positioning and fixation device for upper limb radiotherapy according to claim 6, characterized in that, The lower support sleeve (2051) is provided with a locking groove (2057) on its outer side; the locking fin (2055) is disposed in the locking groove (2057), and the outer surface of the locking fin (2055) protrudes from the outer surface of the lower support sleeve (2051).

8. The positioning and fixation device for upper limb radiotherapy according to claim 7, characterized in that, The lower surface of the customized component is provided with a plurality of plug-in sleeves; the plug-in sleeves can be plugged into the upper support column (2052).

9. The positioning and fixation device for upper limb radiotherapy according to claim 8, characterized in that, The lower end of the lower support sleeve (2051) is provided with a mounting stud (2054); the fixture base (203) is provided with a plurality of threaded mounting holes (208); the mounting stud (2054) is screwed into the threaded mounting hole (208) by thread.

10. The positioning and fixation device for upper limb radiotherapy according to any one of claims 1-9, characterized in that, The first positioning line (102) is set parallel to the first positioning groove (101); the second positioning line (207) is set parallel to the second positioning groove (206); the first scale line (103) is set on the upper surface of the base plate (1), and its extension direction is set parallel to the first positioning groove (101); the second scale line (209) is set on the side of the second positioning groove (206), and its extension direction is set parallel to the second positioning groove (206).

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