Tongue pressing device for tongue cancer radiotherapy

By designing a tongue pressing device for tongue cancer radiotherapy, including an upper expansion, a downward pressure member and an adjustment structure, the problem of temporary production and inability to be adjusted in the prior art is solved, and the functions of direct mass production and adjustment according to patient needs are realized, and the efficiency of radiotherapy treatment is improved.

CN222549996UActive Publication Date: 2025-03-04QILU HOSPITAL(QINGDAO) CHEELOO COLLEGE OF MEDICINE SHANDONG UNIV
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Patent Information

Application Number
CN202420377967.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-02-29
Publication Date
2025-03-04
Estimated Expiration
2034-02-28

AI Technical Summary

Technical Problem

The tongue pressing device used for tongue cancer radiotherapy in the prior art needs to be temporarily produced, resulting in low treatment efficiency and inability to adjust according to the patient's mouth opening size, and poor fixation effect.

Method used

A tongue pressing device including an upper expansion member, a downward member and an adjustment structure is designed. The upper expansion member and the lower press member adjust the distance between the first and second occlusion portions by adjusting the relative movement of the structure, thereby realizing the distance between the palate and the tongue.

Benefits of technology

The device can be used directly in mass production without temporary production. It can adjust the distance between the palate and the tongue according to the needs of different patients, thereby improving the efficiency of radiotherapy treatment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a tongue depressing device for tongue cancer radiotherapy. The tongue depressing device comprises an upper expanding piece, a lower pressing piece and an adjusting structure, wherein the upper expanding piece is provided with an upper main body part, a mouth expanding part arranged at one end of the upper main body part and a connecting part arranged at the other end, and a first meshing part is arranged on the top surface of the mouth expanding part; the lower pressing piece is provided with a lower main body part, and a second meshing part vertically opposite to the first meshing part is arranged on the bottom surface of the lower main body part; the adjusting structure is arranged on the upper expanding piece and the lower pressing piece and used for adjusting the distance between the first meshing part and the second meshing part. During use, the end parts of the upper expanding piece and the lower pressing piece are put into the mouth of a patient, so that the upper teeth and the lower teeth of the patient bite the first occlusion part and the second occlusion part respectively, and the distance between the upper jaw and the tongue is adjusted through the adjusting structure. The tongue depressing device for tongue cancer radiotherapy can be produced in batches, can be directly used without temporary manufacturing, can adjust the distance between the palate and the tongue according to the conditions of different patients, and improves the efficiency of radiotherapy treatment.
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Description

Technical Field

[0001] The utility model relates to the technical field of medical mouthpieces, in particular to a tongue depressor device used for radiotherapy of tongue cancer. Background Art

[0002] Tongue cancer is one of the most common malignant tumors among oral cancers. Compared with other oral cancers that occur in the mouth, pharynx and other areas, the tongue structure is relatively independent, and tumors are mostly confined to the tongue. Surgery is usually the main and most effective treatment, while radiotherapy is a key step in postoperative adjuvant treatment for some high-risk patients. The advantage of radiotherapy is that for oral cancer patients, postoperative radiotherapy will eradicate residual tumors to a greater extent (such as positive resection margins or cervical lymph node metastasis and other high-risk factors such as vascular infiltration); radiotherapy also has disadvantages, such as: radiotherapy is generally not used as an independent treatment for tongue cancer, but mainly combined with surgical treatment; in addition, radiotherapy may also cause complications such as tissue damage and jaw necrosis.

[0003] In clinical practice, when radiotherapy is performed on patients with postoperative tongue cancer, the patient's upper jaw and tongue need to be separated. The tongue depressor currently used in clinical practice usually stacks multiple ordinary tongue depressors together, arranges them into a trapezoidal shape, and then wraps and fixes them with medical tape. When in use, this homemade tongue depressor is placed in the patient's mouth to separate the upper jaw and tongue; the current problem is that the homemade tongue depressor needs to be made temporarily each time, and the outer packaging of multiple ordinary tongue depressors needs to be torn off, the tongue depressors need to be broken and placed in position, and then wrapped and fixed with medical tape. Since it needs to be made before each radiotherapy, it is troublesome and reduces the efficiency of radiotherapy; and if the patient's mouth opening size is adjusted, the temporary tongue depressor cannot be adjusted accordingly, and the tongue depressor effect is poor; in addition, the position of the upper and lower teeth biting is also uncertain, and the tongue depressor has a general fixing effect in the patient's mouth.

[0004] Therefore, how to design a mass-produced tongue depressor for separating the upper palate and the tongue for radiotherapy of tongue cancer, which can be used directly without temporary production and can adjust the opening size according to different patients to improve the efficiency of radiotherapy treatment, is a technical problem that has not yet been solved in the prior art. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the technical defects of the tongue depressor device in the prior art, which needs to be temporarily made before each radiotherapy, taking up the time of radiotherapy treatment and resulting in low efficiency of radiotherapy treatment, and cannot be adjusted according to the size of the patient's mouth opening, and the upper and lower teeth biting positions are not fixed, resulting in poor fixation effect, so as to provide a tongue depressor device that can be mass-produced and used to separate the upper palate and tongue for tongue cancer radiotherapy, which can be used directly without temporary production and can adjust the opening size according to different patients to improve the efficiency of radiotherapy treatment.

[0006] To this end, the utility model provides a tongue depressor for tongue cancer radiotherapy, comprising:

[0007] The upper expansion piece comprises an upper main body, a flaring part arranged at one end of the upper main body, and a connecting part arranged at the other end of the upper main body; a first engaging part is arranged on the top surface of the flaring part;

[0008] The pressing member comprises a lower main body, the connecting part is rotatably connected to the middle part of the lower main body; a second engaging part is arranged on the bottom surface of the lower main body opposite to the first engaging part;

[0009] The adjusting structure is arranged on the upper expansion member and the lower pressing member, and is used for driving the upper expansion member to approach or move away from the lower pressing member, so as to adjust the spacing distance between the first bite portion and the second bite portion.

[0010] As a preferred solution, a connecting through hole is provided on the connecting part, and two opposite fixing plates are provided on the lower main body part. Through holes are provided on both fixing plates. After a connecting shaft is passed through the through holes and the connecting through hole, a rotatable connection is achieved between the connecting part and the lower main body part.

[0011] As a preferred solution, the regulating structure includes:

[0012] A threaded through hole, provided on the lower main body, having an internal thread;

[0013] The adjusting member comprises an adjusting body, an operating part arranged at the bottom end of the adjusting body, and an adjusting block arranged at the top end of the adjusting body; an external thread is arranged on the outer wall of the adjusting body, and the adjusting body is threadedly connected with the threaded through hole;

[0014] The adjusting long groove is arranged on the bottom surface of the upper main body part and is used to accommodate the adjusting block, and the adjusting block can move inside the adjusting long groove along the length direction of the adjusting long groove.

[0015] As a preferred solution, the adjusting body comprises a first body and a second body connected end to end, and the adjusting block is fixedly connected to the top of the second body; the diameter of the first body is larger than the diameter of the second body, and the diameter of the second body is smaller than the diameter of the adjusting block;

[0016] The adjusting long slot has a lower opening, and the width of the lower opening is greater than the diameter of the second body and smaller than the diameters of the first body and the adjusting block.

[0017] As a preferred solution, one end of the adjusting slot away from the connecting portion is open.

[0018] As a preferred embodiment, the upper main body portion includes a first upper main body portion and a second upper main body portion, the bottom surface of the first upper main body portion is a horizontal surface, the bottom surface of the second upper main body portion is an inclined surface, the lower opening of the adjustment slot is opened on the bottom surface of the first upper main body portion, and one end of the adjustment slot is open from one side of the bottom surface of the second upper main body portion.

[0019] As a preferred solution, the lower body portion includes a first lower body portion and a second lower body portion, the fixing plate is disposed between the first lower body portion and the second lower body portion, the first lower body portion is used for tongue pressing, and the second lower body portion is used for hand holding.

[0020] As a preferred solution, a portion of the top surface of the first lower body portion close to the end portion forms an inclined surface.

[0021] As a preferred solution, the second engaging portion is opened at a position substantially opposite to one end of the inclined surface.

[0022] As a preferred solution, the expansion nozzle portion is an arc-shaped curved structure, and the first engaging portion is provided on the top surface of the arc-shaped expansion nozzle portion.

[0023] The technical solution provided by the utility model has the following advantages:

[0024] 1. The utility model discloses a tongue depressing device for radiotherapy of tongue cancer, comprising an upper expansion piece, a lower pressure piece and an adjusting structure; wherein the upper expansion piece comprises an upper main body, a mouth expansion piece arranged at one end of the upper main body and a connecting part at the other end, and a first bite portion is arranged on the top surface of the mouth expansion piece; the lower pressure piece comprises a lower main body, the connecting part is rotatably connected to the middle part of the lower main body, and a second bite portion opposite to the first bite portion is arranged on the bottom surface of the lower main body; the adjusting structure is arranged on the upper expansion piece and the lower pressure piece, and is used to drive the upper expansion piece and the lower pressure piece to move relative to each other, so as to adjust the distance between the first bite portion and the second bite portion.

[0025] When in use, the ends of the upper expansion piece and the lower pressure piece are placed in the patient's mouth, and the patient's upper teeth and lower teeth are respectively bitten at the first bite part and the second bite part. Then, the distance between the upper jaw and the tongue is adjusted by adjusting the structure until the requirements are met. The tongue depressor device for radiotherapy of tongue cancer of the utility model can be made into mass-produced medical consumables, which can be used directly without temporary production, and the distance between the upper jaw and the tongue can be adjusted according to the conditions of different patients, thereby saving time and improving the efficiency of radiotherapy.

[0026] 2. The tongue depressor for radiotherapy of tongue cancer of the utility model rotatably connects the connecting part and the lower main body part through a fixing plate and a connecting shaft, which is simple and convenient to adjust the distance between the upper jaw and the tongue.

[0027] 3. The utility model of the tongue depressor device for radiotherapy of tongue cancer has a threaded through hole arranged on the lower main body, an adjusting main body is threadedly connected to the threaded through hole, an adjusting long groove is arranged on the bottom surface of the upper main body, an adjusting block is inserted into the adjusting long groove and can move in the adjusting long groove; by rotating the adjusting main body in the threaded through hole, the adjusting block is driven to move in the adjusting long groove, thereby adjusting the distance between the upper main body and the lower main body, and further adjusting the distance between the upper jaw and the tongue.

[0028] 4. The tongue depressor device for radiotherapy of tongue cancer of the utility model comprises a lower main body comprising a first lower main body and a second lower main body. The end of the first lower main body is used for depressing the tongue, and the top surface is arranged as an inclined surface to reduce the thickness and increase the operating space; the second main body is used for hand-holding for easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the prior art or the specific implementation methods of the present utility model, the drawings used in the description of the prior art or the specific implementation methods are briefly introduced below.

[0030] Figure 1 The utility model is a schematic diagram of the overall structure of a tongue depressor for radiotherapy of tongue cancer.

[0031] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle adjustment part.

[0032] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle and upper extension.

[0033] Figure 4 yes Figure 3 Another stereoscopic view of .

[0034] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle and lower pressure parts.

[0035] Figure 6 yes Figure 5 Another stereoscopic view of .

[0036] Figure 7 It is a schematic diagram of the structure of the connecting shaft.

[0037] : 1. upper expansion piece; 11. upper main body; 110. adjusting long groove; 111. first upper main body; 112. second upper main body; 113. lower opening; 12. expanding mouth; 120. first bite part; 13. connecting part; 130. connecting through hole; 2. pressing piece; 21. lower main body; 210. first lower main body; 211. second lower main body; 212. threaded through hole; 22. inclined surface; 23. fixing plate; 230. through hole; 24. second bite part; 3. connecting shaft; 4. adjusting piece; 41. adjusting main body; 411. first main body; 412. second main body; 42. operating part; 43. adjusting block. DETAILED DESCRIPTION

[0038] In order to make those skilled in the art better understand the present solution, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the claims and description of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units clearly listed, but may also include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

[0041] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Example

[0042] This embodiment provides a tongue depressor for radiotherapy of tongue cancer, such as Figure 1-7 As shown, it includes: an upper expander 1, a lower pressure piece 2 and an adjustment structure; wherein the upper expander 1 has an upper main body portion 11, a flaring portion 12 arranged at one end of the upper main body portion 11, and a connecting portion 13 arranged at the other end of the upper main body portion 11; a first bite portion 120 is arranged on the top surface of the flaring portion 12; the lower pressure piece 2 has a lower main body portion 21, and the connecting portion 13 is rotatably connected to the middle portion of the lower main body portion 21; a second bite portion 24 is arranged on the bottom surface of the lower main body portion 21 opposite to the first bite portion 120; the adjustment structure is arranged on the upper expander 1 and the lower pressure piece 2, and is used to drive the upper expander 1 to approach or move away from the lower pressure piece 2 to adjust the spacing distance between the first bite portion 120 and the second bite portion 24.

[0043] When in use, the ends of the upper expansion piece 1 and the lower pressure piece 2 are placed in the patient's mouth, and the patient's upper teeth and lower teeth are respectively bitten at the first bite portion 120 and the second bite portion 24. The distance between the upper jaw and the tongue is adjusted by adjusting the structure until the requirements are met. The tongue depressor device for radiotherapy of tongue cancer in this embodiment can be made into a mass-produced medical consumable, which can be used directly without temporary production, and the distance between the upper jaw and the tongue can be adjusted according to the conditions of different patients, thereby saving time and improving the efficiency of radiotherapy.

[0044] like Figure 3-7 As shown, the connecting portion 13 is provided with a connecting through hole 130, and the lower body portion 21 is provided with two opposite fixing plates 23, and the two fixing plates 23 are provided with a through hole 230. After the connecting shaft 3 passes through the through hole 230 and the connecting through hole 130, the connecting portion 13 is rotatably connected to the lower body portion 21. When the fixing plates 23 are provided with different heights, the distance between the upper expansion member 1 and the lower pressing member 2 can be conveniently adjusted, and the distance between the upper jaw and the tongue can be conveniently adjusted.

[0045] Specifically, Figure 2-6As shown, the adjustment structure includes: a threaded through hole 212 provided on the lower body 21, an adjustment member 4, and an adjustment slot 110 provided on the bottom surface of the lower body 11. The threaded through hole 212 is provided on the lower body 21 and has an internal thread; the adjustment member 4 includes an adjustment body 41, an operating portion 42 provided at the bottom end of the adjustment body 41, and an adjustment block 43 provided at the top end of the adjustment body 41; an external thread is provided on the outer wall of the adjustment body 41, and the adjustment body 41 is threadedly connected with the threaded through hole 212; the adjustment slot 110 is provided on the bottom surface of the upper body 11, and is used to accommodate the adjustment block 43, and the adjustment block 43 can move inside the adjustment slot 110 along the length direction of the adjustment slot 110. By operating the adjustment body 41 to rotate in the threaded through hole 212, the extended length of the adjustment block 43 can be adjusted, and the adjustment block 43 can move in the adjustment slot 110, so that the separation distance between the upper body part 11 and the lower body part 21 can be adjusted, and then the separation distance between the upper palate and the tongue can be adjusted.

[0046] The adjusting body 41 includes a first body 411 and a second body 412 connected end to end, and the adjusting block 43 is fixedly connected to the top of the second body 412; the diameter of the first body 411 is larger than the diameter of the second body 412, and the diameter of the second body 412 is smaller than the diameter of the adjusting block 43; the adjusting slot 110 has a lower opening 113, and the width of the lower opening 113 is larger than the diameter of the second body 412, and smaller than the diameters of the first body 411 and the adjusting block 43. Since the diameter of the adjusting block 43 is larger than the width of the lower opening 113, the adjusting block 43 cannot escape from the adjusting slot 110 from the lower opening 113; there are two advantages of such a setting. First, the connection between the adjusting block 43 and the adjusting slot 110 is relatively stable, and the two always maintain a connection relationship; second, when the adjusting body 41 is operated to move in a direction away from the upper expansion member 1, the adjusting block 43 can pull the upper expansion member 1 to move downward.

[0047] One end of the adjusting slot 110 away from the connecting portion 13 is open.

[0048] An operating portion 42 is disposed at the end of the first main body portion 411 , and an outer wall of the operating portion 42 is provided with anti-slip grooves.

[0049] The upper main body portion 11 includes a first upper main body portion 111 and a second upper main body portion 112, the bottom surface of the first upper main body portion 111 is a horizontal surface, the bottom surface of the second upper main body portion 112 is an inclined surface, the lower opening 113 of the adjusting long groove 110 is opened on the bottom surface of the first upper main body portion 111, and one end of the adjusting long groove 110 is open from one side of the bottom surface of the second upper main body portion 112.

[0050] The lower body portion 21 includes a first lower body portion 210 and a second lower body portion 211 , and the fixing plate 23 is disposed between the first lower body portion 210 and the second lower body portion 211 . The first lower body portion 210 is used for tongue pressing, and the second lower body portion 211 is used for holding.

[0051] A portion of the top surface of the first lower body portion 210 near the end is formed into an inclined surface 22, which can reduce the thickness and increase the operating space.

[0052] The second engaging portion 24 is disposed at a position substantially opposite to one end of the inclined surface 22 .

[0053] The expansion nozzle portion 12 is an arc-shaped curved structure, and the first engaging portion 120 is provided on the top surface of the arc-shaped expansion nozzle portion 12 .

[0054] The tongue depressor device for radiotherapy of tongue cancer in this embodiment is used as follows: when in use, first put the ends of the upper expansion member 1 and the lower pressure member 2 into the patient's mouth, and let the patient's upper teeth and lower teeth bite the first bite portion 120 and the second bite portion 24 respectively; then manually operate the operating part 42 to rotate, so that the first body 411 rotates in the threaded through hole 212, the adjustment block 43 gradually moves upward, and moves inside the adjustment long groove 110, and then drives the upper expansion member 1 to open upward, thereby increasing the distance between the first bite portion 120 and the second bite portion 24; when it is necessary to reduce the distance between the first bite portion 120 and the second bite portion 24, the operating part 42 is rotated in the reverse direction, so that the first body 411 rotates in the reverse direction in the threaded through hole 121, the adjustment block 43 gradually moves downward, and the upper expansion member 1 gradually falls under the action of gravity or upper pressure, or it can fall under the downward pull between the adjustment block 43 and the adjustment long groove 110, until it is adjusted to the target spacing distance.

[0055] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of this innovative technical solution.

Claims

1. A tongue depressor for radiotherapy of tongue cancer, characterized in that: include: The upper expansion piece (1) comprises an upper main body portion (11), a nozzle portion (12) arranged at one end of the upper main body portion (11), and a connecting portion (13) arranged at the other end of the upper main body portion (11); a first engaging portion (120) is arranged on the top surface of the nozzle portion (12); The pressing member (2) comprises a lower main body (21), the connecting portion (13) being rotatably connected to the middle portion of the lower main body (21); a second engaging portion (24) is provided on the bottom surface of the lower main body (21) which is opposite to the first engaging portion (120) in upper and lower directions; An adjustment structure is provided on the upper expansion member (1) and the lower pressing member (2), and is used to drive the upper expansion member (1) to move closer to or farther from the lower pressing member (2), so as to adjust the spacing distance between the first bite portion (120) and the second bite portion (24).

2. The tongue depressor for radiotherapy of tongue cancer according to claim 1, characterized in that: The connecting portion (13) is provided with a connecting through hole (130), the lower main body portion (21) is provided with two opposite fixing plates (23), both fixing plates (23) are provided with a through hole (230), and after the connecting shaft (3) passes through the through hole (230) and the connecting through hole (130), a rotatable connection is achieved between the connecting portion (13) and the lower main body portion (21).

3. The tongue depressor for radiotherapy of tongue cancer according to claim 1, characterized in that: The regulatory structure comprises: A threaded through hole (212), arranged on the lower main body (21) and having an internal thread; The adjusting member (4) comprises an adjusting body (41), an operating portion (42) arranged at the bottom end of the adjusting body (41), and an adjusting block (43) arranged at the top end of the adjusting body (41); an external thread is provided on the outer wall of the adjusting body (41), and the adjusting body (41) is threadedly connected to the threaded through hole (212); The adjusting long groove (110) is arranged on the bottom surface of the upper main body (11) and is used to accommodate the adjusting block (43), and the adjusting block (43) can move inside the adjusting long groove (110) along the length direction of the adjusting long groove (110).

4. The tongue depressor for radiotherapy of tongue cancer according to claim 3, characterized in that: The adjusting body (41) comprises a first body (411) and a second body (412) connected end to end, and the adjusting block (43) is fixedly connected to the top of the second body (412); the diameter of the first body (411) is larger than the diameter of the second body (412), and the diameter of the second body (412) is smaller than the diameter of the adjusting block (43); The adjusting long slot (110) has a lower opening (113), and the width of the lower opening (113) is greater than the diameter of the second body (412) and smaller than the diameters of the first body (411) and the adjusting block (43).

5. The tongue depressor for radiotherapy of tongue cancer according to claim 4, characterized in that: One end of the adjusting long slot (110) away from the connecting portion (13) is open.

6. The tongue depressor for radiotherapy of tongue cancer according to claim 5, characterized in that: The upper main body portion (11) comprises a first upper main body portion (111) and a second upper main body portion (112); the bottom surface of the first upper main body portion (111) is a horizontal surface, and the bottom surface of the second upper main body portion (112) is an inclined surface; the lower opening (113) of the adjusting long groove (110) is provided on the bottom surface of the first upper main body portion (111), and one end of the adjusting long groove (110) is open from one side of the bottom surface of the second upper main body portion (112).

7. The tongue depressor for radiotherapy of tongue cancer according to claim 2, characterized in that: The lower body part (21) comprises a first lower body part (210) and a second lower body part (211); the fixing plate (23) is disposed between the first lower body part (210) and the second lower body part (211); the first lower body part (210) is used for tongue depressing, and the second lower body part (211) is used for hand-holding.

8. The tongue depressor for radiotherapy of tongue cancer according to claim 7, characterized in that: A portion of the top surface of the first lower main body portion (210) close to the end portion forms an inclined surface (22).

9. The tongue depressor for radiotherapy of tongue cancer according to claim 8, characterized in that: The opening position of the second engaging portion (24) is substantially opposite to one end of the inclined surface (22) in the vertical direction.

10. The tongue depressor for radiotherapy of tongue cancer according to claim 1, characterized in that: The expansion nozzle portion (12) is an arc-shaped curved structure, and the first engaging portion (120) is provided on the top surface of the arc-shaped expansion nozzle portion (12).