A shoulder-neck positioning device for head and neck radiotherapy

Abstract

The application provides a shoulder and neck positioning device for head and neck radiotherapy, and belongs to the technical field of medical instruments. The device comprises a chassis, and a plurality of shoulder and neck positioning mechanisms are arranged on the chassis. Each shoulder and neck positioning mechanism comprises a plurality of self-adapting support assemblies arranged in a straight line and an adjusting rod. The self-adapting support assembly comprises a bottom shell, a support shaft, a spring, a gear, a first extrusion piece and a second extrusion piece. The lower part of the support shaft is provided with an eccentric shaft part. The first extrusion piece and the second extrusion piece are oppositely arranged on the outside of the eccentric shaft part. The spring is arranged between the bottom of the support shaft and the bottom wall of the channel. The adjusting rod is simultaneously in transmission connection with all self-adapting support assemblies of the group. In the application, a plurality of shoulder and neck positioning mechanisms cover the shoulder and neck area of a patient. A plurality of independent self-adapting support assemblies can accurately fit the physiological concave-convex curve of the human body, so that the pressure is uniformly distributed. Meanwhile, the axial locking of each support shaft can be synchronously completed by rotating the hand wheel.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a neck and shoulder positioning device for head and neck radiotherapy. Background Technology

[0002] In radiotherapy for head and neck tumors, high precision in target localization is required, and postural stability is a key factor determining the success or failure of treatment. In current clinical practice, postural fixation for head and neck radiotherapy mainly relies on thermoplastic film combined with foam pad molding technology: first, the patient's head, shoulders, and back are pressed into shape on a foam pad, and then covered with thermoplastic film for cooling and shaping.

[0003] While this method can achieve basic fixation, the shoulder muscles are well-developed and have a high degree of mobility. Even with foam molding, the muscle tension during each treatment can cause changes in the shape of the soft tissues in the neck and shoulders, which in turn can lead to vertical and horizontal displacement of the scapula, ultimately causing changes in the target area of ​​the lower neck and supraclavicular region, thus affecting clinical efficacy. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a neck and shoulder positioning device for head and neck radiotherapy.

[0005] The technical solution adopted by this invention is as follows: This application provides a shoulder and neck positioning device for head and neck radiotherapy, including a base frame. A plurality of shoulder and neck positioning mechanisms are arranged on the base frame. Each shoulder and neck positioning mechanism includes multiple adaptive support components and adjusting rods arranged in a straight line. Each adaptive support component includes a bottom shell, a support shaft, a spring, a gear, a first compression plate, and a second compression plate. A channel is opened along the axial direction of the bottom shell. The support shaft is slidably arranged along the channel. An eccentric shaft portion is provided at the lower part of the support shaft. The first compression plate and the second compression plate are fitted together outside the eccentric shaft portion. The spring is disposed between the bottom of the support shaft and the bottom wall of the channel. The gear… The adjustable rod is slidably mounted on the support shaft and rotates synchronously with it. A straight groove is provided on one side of the gears of the multiple adaptive support components. The adjustable rod is slidably mounted in the straight groove, and a rack part that meshes with the gear is provided near the gear. One end of the adjustable rod is provided with a lead screw section, and the end of the lead screw section is provided with a handwheel. A screw sleeve that screws into the lead screw section is provided on the base frame. Rotating the handwheel causes the adjustable rod to move along the straight groove, which drives the gears of each adaptive support component to rotate, drives the support shaft of each adaptive support component to rotate, and drives the eccentric shaft part of the support shaft to rotate, so that the first extrusion plate and the second extrusion plate abut against the inner wall of the channel to form axial positioning.

[0006] In some embodiments, the inner wall of the channel is provided with a plurality of positioning grooves along its axial direction, and the outer walls of the first extrusion piece and the second extrusion piece are provided with positioning strips that slide and cooperate with the positioning grooves.

[0007] In some embodiments, an upper convex portion and a lower convex portion are respectively provided on the upper and lower sides of the eccentric shaft portion on the support shaft, and the first extrusion sheet and the second extrusion sheet are axially limited between the upper convex portion and the lower convex portion.

[0008] In some embodiments, the lower end of the upper convex disc is provided with a first conical portion that is larger at the top and smaller at the bottom, and the upper ends of both the first extrusion sheet and the second extrusion sheet are provided with a second conical portion that is adapted to the first conical portion.

[0009] In some embodiments, the device further includes two fixing plates. The base frame is provided with mounting holes for inserting the bottom shell. The two fixing plates are fitted together on the top of the bottom shell. The top of the bottom shell is provided with a radial insertion hole. The fixing plates are provided with insertion rods adapted to the insertion holes. The mounting holes are provided with stepped portions. The two fixing plates abut against the stepped portions. The adjusting rod is provided with a limiting plate portion above the rack portion. The gear is located between the two fixing plates and the limiting plate portion.

[0010] In some embodiments, a limiting slot is provided at the top of the straight groove, and a fixing plate is provided in the limiting slot, with at least one side of the plate penetrating the base frame.

[0011] In some embodiments, a positioning post is provided at the bottom of the bottom shell, a positioning groove is provided on the lower end face of the lower convex plate along its axial direction, and the spring is disposed between the positioning post and the positioning groove.

[0012] In some embodiments, the mounting holes limit the circumferential rotation of the fixing plate or the bottom shell, and the number of mounting holes is greater than the number of bottom shells.

[0013] In some embodiments, a support pad is provided at the top of the support shaft, and the upper end surface of the support pad is provided with an arc-shaped surface.

[0014] In some embodiments, the system further includes two sets of arm positioning mechanisms. Each arm positioning mechanism includes a first guard plate disposed on both sides of the base frame. A second guard plate that can be flipped and locked is hinged to the side of the first guard plate away from the shoulder and neck positioning mechanism. A plurality of locking posts are spaced apart at the bottom of the first guard plate. A plurality of locking holes that are adapted to the locking posts are evenly disposed on both sides of the base frame. A fixing hole is provided at the bottom of the first guard plate and / or the second guard plate for inserting a fixing strap.

[0015] The beneficial effects of the present invention are as follows: In the present invention, multiple sets of shoulder and neck positioning mechanisms cover the patient's shoulder and neck area, and several independent adaptive support components can accurately fit the physiological concave and convex curves of the human body, so that the pressure is evenly distributed, and the axial locking of each support shaft can be completed simultaneously by rotating the handwheel. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0017] Figure 1 This is a schematic diagram of a neck and shoulder positioning device for head and neck radiotherapy according to the present invention; Figure 2 This is a partial schematic diagram of the shoulder and neck positioning mechanism in this invention; Figure 3 This is an exploded view of the adaptive support component in this invention; Figure 4 This is a partial sectional view of a neck and shoulder positioning device for head and neck radiotherapy according to the present invention; Figure 5 A cross-sectional view of the adaptive support component in this invention. Figure 1 ; Figure 6 A cross-sectional view of the adaptive support component in this invention. Figure 2 ; Figure 7 This is a partial schematic diagram of a neck and shoulder positioning device for head and neck radiotherapy according to the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the arm positioning mechanism in this invention; Figure 9 This is a partial schematic diagram of a neck and shoulder positioning device for head and neck radiotherapy according to the present invention. Figure 2 ; In the diagram: 1-Base frame, 2-Shoulder and neck positioning mechanism, 3-Adaptive support assembly, 4-Adjusting rod, 5-Bottom shell, 6-Support shaft, 7-Spring, 8-Gear, 9-First extrusion plate, 10-Second extrusion plate, 11-Channel, 12-Eccentric shaft, 13-Straight groove, 14-Rack, 15-Screw section, 16-Handwheel, 17-Screw sleeve, 18-Positioning groove, 19-Positioning strip, 20-Upper convex plate, 21- - Lower convex plate, 22- First conical part, 23- Second conical part, 24- Fixing plate, 25- Mounting hole, 26- Insertion hole, 27- Insertion rod, 28- Stepped part, 29- Limiting plate part, 30- Limiting slot, 31- Fixing insert plate, 32- Positioning post, 33- Support pad, 34- Arc-shaped surface, 35- Arm positioning mechanism, 36- First guard plate, 37- Second guard plate, 38- Snap-fit ​​post, 39- Snap-fit ​​hole. Detailed Implementation

[0018] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0021] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0022] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0025] Existing radiotherapy positioning devices cannot effectively locate the patient's shoulder and neck area. This is mainly because the back of the shoulder and neck is easily affected by muscle tension, which leads to changes in the shape of the soft tissues in the shoulder and neck area. This, in turn, causes the scapula to shift vertically and horizontally, ultimately resulting in changes in the target area of ​​the lower neck and supraclavicular region, thus affecting clinical efficacy.

[0026] Based on the above issues, such as Figures 1 to 9 As shown, this application proposes a neck and shoulder positioning device for head and neck radiotherapy, including a base frame 1. Multiple sets of neck and shoulder positioning mechanisms 2 are arranged in parallel on the base frame 1, corresponding to and supporting the patient's neck and shoulder areas from front to back. Each neck and shoulder positioning mechanism 2 includes several linearly arranged adaptive support components 3 and an adjusting rod 4. The adjusting rod 4 is simultaneously connected to all the adaptive support components 3 in that set. The multiple positioning mechanisms cooperate to form a three-dimensional support surface covering the neck and shoulder area, accurately conforming to the physiological contours of the patient's neck and shoulder.

[0027] For example, the adaptive support components 3 in each of the shoulder and neck positioning mechanisms 2 can be arranged in groups of three to six at intervals.

[0028] The adaptive support assembly 3 includes a base shell 5, a support shaft 6, a spring 7, a gear 8, a first extrusion plate 9, and a second extrusion plate 10. Preferably, the base shell 5 is a cylindrical shell with an axially extending channel 11 inside. The support shaft 6 is coaxially slidably disposed within the channel 11, and an eccentric shaft portion 12 is integrally formed on the lower part of the support shaft 6. The axis of the eccentric shaft portion 12 is parallel to the axis of the support shaft 6 and has an eccentricity.

[0029] The first compression plate 9 and the second compression plate 10 are two symmetrical semi-annular structures, which are fitted together on the outside of the eccentric shaft portion 12. The spring 7 is located between the bottom of the support shaft 6 and the bottom wall of the channel 11, providing upward elastic support for the support shaft 6. When the patient lies on the device, each support shaft 6 will automatically compress the spring 7 according to the pressure at the contact point, independently adjusting the extension height, so that all support points simultaneously fit against the surface of the patient's head, shoulders and back, achieving uniform pressure distribution and completely eliminating the local pressure concentration and body tilt caused by plank support.

[0030] The gear 8 is slidably sleeved on the upper part of the support shaft 6, rotates synchronously with the support shaft 6, and can slide relative to it axially. For example, the support shaft 6 includes a shaft body portion with a hexagonal cross-section, and the inner hole of the gear 8 is also hexagonal.

[0031] A straight groove 13 is provided on the same side of the gears 8 of the multiple adaptive support components 3. The adjusting rod 4 is slidably disposed in the straight groove 13. A continuous rack portion 14 is provided on the side of the adjusting rod 4 facing the gear 8. The rack portion 14 meshes with all the gears 8 at the same time. One end of the adjusting rod 4 extends out of the straight groove 13 and is provided with a lead screw section 15. A handwheel 16 is fixedly connected to the end of the lead screw section 15. A screw sleeve 17 that is helically engaged with the lead screw section 15 is fixedly disposed on the base frame 1.

[0032] Once all support shafts 6 automatically conform to the patient's contour, rotating the handwheel 16 causes the lead screw section 15 and the threaded sleeve 17 to engage, driving the adjusting rod 4 to move axially along the straight groove 13. The rack section 14 drives all gears 8 to rotate synchronously, thereby causing each support shaft 6 to rotate synchronously. As the support shaft 6 rotates, the eccentric shaft section 12 revolves around the support shaft axis, pushing the first extrusion plate 9 and the second extrusion plate 10 to expand radially outward until their outer walls are tightly abutting against the inner wall of the channel 11. This utilizes friction to achieve synchronous axial positioning of all support shafts 6. This design avoids the tedious operation of adjusting each support point individually and can adapt to the back contour of the patient's shoulder and neck.

[0033] It is understandable that this device can fit the back of the patient's neck and shoulders to provide effective support. In normal head and neck radiotherapy, the front of the patient's head and neck still needs to be covered with a body shield to restrict the patient's head from moving up and down or left and right.

[0034] In some embodiments, in the multiple sets of shoulder and neck positioning mechanisms 2 arranged in parallel, a transmission component is provided at the same end of each adjusting rod 4 for linkage, so that one handwheel 16 can be used for adjustment. For example, the transmission component is a gear drive or a pulley drive. In addition, a locking component is provided between the base frame 1 and the adjusting rod 4 to prevent accidental contact with the handwheel during treatment from causing the adjusting rod 4 to move. For example, the locking component is provided at the end of the adjusting rod 4 away from the handwheel 16, and a limit bolt is provided at this end. After adjustment, the limit bolt is rotated to press the adjusting rod 4 against the handwheel.

[0035] In some embodiments, the inner wall of the channel 11 is uniformly provided with multiple positioning grooves 18 along the axial direction, and the outer walls of the first extrusion piece 9 and the second extrusion piece 10 are correspondingly provided with positioning strips 19 that slide and engage with the positioning grooves 18. The positioning strips 19 engage with the positioning grooves 18 to prevent the first extrusion piece 9 and the second extrusion piece 10 from rotating with the support shaft 6, ensuring that they can only move radially; on the other hand, when locked, the positioning strips 19 are embedded in the positioning grooves 18, increasing the locking force and effectively preventing the support shaft 6 from sliding axially during treatment.

[0036] In some embodiments, an upper convex portion 20 and a lower convex portion 21 are integrally formed on the upper and lower sides of the eccentric shaft portion 12 on the support shaft 6, respectively. The first extrusion piece 9 and the second extrusion piece 10 are axially limited between the upper convex portion 20 and the lower convex portion 21 to prevent them from moving axially and to ensure the stability of the eccentric transmission.

[0037] In some embodiments, the lower end of the upper convex disc portion 20 is provided with a first tapered portion 22 that is larger at the top and smaller at the bottom, and the upper ends of the first extrusion plate 9 and the second extrusion plate 10 are each provided with a second tapered portion 23 that is adapted to the first tapered portion 22. When the support shaft 6 rotates and drives the eccentric shaft portion 12 to spread the first extrusion plate 9 and the second extrusion plate 10 apart, the first tapered portion 22 and the second tapered portion 23 press against each other, generating a downward axial force, so that the first extrusion plate 9 and the second extrusion plate 10 are tightly attached to the lower convex disc portion 21, while further enhancing the radial spreading force.

[0038] In some embodiments, two symmetrical fixing pieces 24 are also included. The base frame 1 is provided with multiple rows of mounting holes 25. Adaptive support components are inserted into the required mounting holes 25 as needed. Therefore, the number of mounting holes 25 is greater than the number of bottom shells 5. The bottom shell 5 is inserted into the mounting holes 25 from above. The two fixing pieces 24 are fitted together on the top of the bottom shell 5. The top of the bottom shell 5 is provided with two radially symmetrical insertion holes 26. The inner side of the fixing pieces 24 is provided with insertion rods 27 that are adapted to the insertion holes 26. The upper part of the inner wall of the mounting hole 25 is provided with a stepped portion 28. The lower end faces of the two fixing pieces 24 abut against the stepped portion 28, thereby fixing the bottom shell 5 to the base frame 1. The adjusting rod 4 is located above the rack portion 14 and integrally formed with a limiting plate portion 29. The gear 8 is located between the two fixing pieces 24 and the limiting plate portion 29 to realize the axial limiting of the gear 8 and prevent it from falling off the support shaft 6.

[0039] In some embodiments, a limiting slot 30 is provided at the top of the straight groove 13 along its length direction, and a fixing plate 31 is inserted into the limiting slot 30. At least one side of the fixing plate 31 passes through the base frame 1. The fixing plate 31 can cover the top of the straight groove 13, limit the upper and lower movement of the adjusting rod 4 in the straight groove 13, that is, limit the entire adaptive support assembly 3, while preventing dust and debris from entering the interior and affecting the normal operation of the transmission mechanism, and facilitating disassembly and maintenance.

[0040] In some embodiments, a positioning post 32 is provided at the bottom of the bottom shell 5, and a positioning groove is formed on the lower end face of the lower convex plate 21 along the axial direction. The lower end of the spring 7 is sleeved on the positioning post 32, and the upper end is embedded in the positioning groove. The positioning post 32 and the positioning groove cooperate to prevent the spring 7 from radially shifting during compression and rebound, ensuring the stability of the supporting force.

[0041] In some embodiments, the mounting hole 25 provides circumferential rotational limitation for the fixing piece 24 or the bottom shell 5. For example, the outer contour of the bottom shell 5 is directly set as a polygon, and the mounting hole 25 is adapted accordingly; or, for another example, the upper part of the mounting hole 25 is provided with a polygonal portion, and the outer contour of the fixing piece 24 is set as a polygon; or, for yet another example, the outer wall of the bottom shell 5 is provided with a protrusion along the axial direction, and the inner wall of the mounting hole 25 is provided with a groove corresponding to the protrusion. This configuration prevents the bottom shell 5 from rotating during use and ensures the meshing accuracy between the gear 8 and the rack portion 14.

[0042] In some embodiments, a support pad 33 is threaded or snap-fitted to the top of the support shaft 6. The support pad 33 is made of medical-grade silicone and has an arc-shaped surface 34 on its upper end that conforms to the curve of the human body. The support pad 33 not only improves the patient's comfort but also increases the friction with the skin, further preventing the body from slipping.

[0043] Because arm movements can easily cause changes in the muscles of the shoulder and neck, any movement of the upper arm can further lead to displacement of the scapula.

[0044] Therefore, the device of this application also includes two sets of arm positioning mechanisms 35, respectively disposed on both sides of the base frame 1. Each arm positioning mechanism 35 includes a first guard plate 36 and a second guard plate 37. The second guard plate 37 is hinged to the side of the first guard plate 36 away from the shoulder and neck positioning mechanism 2 via a damping hinge, and can be rotated and locked within a range of 0-90°. Both the first guard plate 36 and the second guard plate 37 have arc-shaped grooves on their inner sides that conform to the elbow contour, and medical sponge pads are adhered within these arc-shaped grooves. Four locking posts 38 are spaced apart along the length of the bottom of the first guard plate 36, and twelve locking holes 39, adapted to the locking posts 38, are evenly distributed along the length of both sides of the base frame 1.

[0045] Furthermore, the bottom of the first guard plate 36 and / or the second guard plate 37 is provided with fixing holes for inserting fixing straps.

[0046] In use, insert the locking pins 38 of the first guard plate 36 into the corresponding locking holes 39 according to the patient's height and adjust it to a suitable position. The patient places their elbow in the arc-shaped groove of the first guard plate 36, flips the second guard plate 37 to fit against the outside of the lower arm and locks it in place, and then uses a fixing strap to bind the upper arm and lower arm by passing through the fixing holes of the first guard plate 36 and the second guard plate 37 respectively, which can completely restrict the up-and-down movement, left-and-right movement, and internal and external rotation of the arm.

[0047] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0048] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0049] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A neck and shoulder positioning device for head and neck radiotherapy, characterized in that, The device includes a base frame on which several shoulder and neck positioning mechanisms are mounted. Each shoulder and neck positioning mechanism includes multiple adaptive support components and adjusting rods arranged in a straight line. Each adaptive support component includes a bottom shell, a support shaft, a spring, a gear, a first pressing plate, and a second pressing plate. A channel is formed along the axial direction of the bottom shell. The support shaft slides along the channel. An eccentric shaft portion is provided at the lower part of the support shaft. The first and second pressing plates are fitted onto the eccentric shaft portion. The spring is located between the bottom of the support shaft and the bottom wall of the channel. The gear is slidably fitted onto the support shaft and rotates synchronously with it. A linear groove is provided on one side of the gears of the multiple adaptive support components. The adjusting rod is slidably disposed in the linear groove, and a rack portion that meshes with the gear is disposed near the gear. One end of the adjusting rod is provided with a lead screw section, and the end of the lead screw section is provided with a handwheel. A screw sleeve that screws into the lead screw section is disposed on the base frame. Rotating the handwheel causes the adjusting rod to move along the linear groove, which drives the gears of each adaptive support component to rotate, drives the support shaft of each adaptive support component to rotate, and drives the eccentric shaft portion of the support shaft to rotate, so that the first extrusion plate and the second extrusion plate abut against the inner wall of the channel to form axial positioning.

2. The neck and shoulder positioning device for head and neck radiotherapy according to claim 1, characterized in that, The inner wall of the channel is provided with a plurality of positioning grooves along its axial direction, and the outer walls of the first extrusion piece and the second extrusion piece are provided with positioning strips that slide and cooperate with the positioning grooves.

3. The neck and shoulder positioning device for head and neck radiotherapy according to claim 1, characterized in that, The support shaft is provided with an upper convex portion and a lower convex portion on the upper and lower sides of the eccentric shaft portion, respectively, and the first extrusion plate and the second extrusion plate are axially limited between the upper convex portion and the lower convex portion.

4. The neck and shoulder positioning device for head and neck radiotherapy according to claim 3, characterized in that, The lower end of the upper convex disc is provided with a first conical part that is larger at the top and smaller at the bottom, and the upper ends of the first extrusion plate and the second extrusion plate are both provided with a second conical part that matches the first conical part.

5. The neck and shoulder positioning device for head and neck radiotherapy according to claim 1, characterized in that, It also includes two fixing plates. The base frame is provided with mounting holes for inserting the bottom shell. The two fixing plates are fitted together on the top of the bottom shell. The top of the bottom shell is provided with a radial insertion hole. The fixing plates are provided with insertion rods that are adapted to the insertion holes. The mounting holes are provided with stepped portions. The two fixing plates abut against the stepped portions. The adjusting rod is provided with a limiting plate portion above the rack portion. The gear is located between the two fixing plates and the limiting plate portion.

6. The neck and shoulder positioning device for head and neck radiotherapy according to claim 5, characterized in that, The top of the straight groove is provided with a limiting slot, and a fixing plate is provided in the limiting slot, with at least one side of the plate penetrating the base frame.

7. The neck and shoulder positioning device for head and neck radiotherapy according to claim 3, characterized in that, The bottom of the bottom shell is provided with a positioning post, and the lower end face of the lower convex plate is provided with a positioning groove along its axial direction. The spring is disposed between the positioning post and the positioning groove.

8. The neck and shoulder positioning device for head and neck radiotherapy according to claim 5, characterized in that, The mounting holes provide circumferential rotational limitation for the fixing plate or the bottom shell, and the number of mounting holes is greater than the number of bottom shells.

9. The neck and shoulder positioning device for head and neck radiotherapy according to claim 1, characterized in that, The top of the support shaft is provided with a support pad, and the upper end surface of the support pad is provided with an arc-shaped surface.

10. A neck and shoulder positioning device for head and neck radiotherapy according to claim 1, characterized in that, It also includes two sets of arm positioning mechanisms. The arm positioning mechanism includes a first guard plate disposed on both sides of the base frame. A second guard plate that can be flipped and locked is hinged to the side of the first guard plate away from the shoulder and neck positioning mechanism. Several locking posts are disposed at intervals on the bottom of the first guard plate. Several locking holes that are adapted to the locking posts are evenly disposed on both sides of the base frame. Fixing holes are disposed on the bottom of the first guard plate and / or the second guard plate. The fixing holes are used to pass through the fixing straps.

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