Oral cavity detection expanding device

Abstract

The invention discloses an oral cavity detection expanding and supporting device, and relates to the technical field of medical instruments, the oral cavity detection expanding and supporting device comprises a supporting ring, the supporting ring is in an open circular ring shape, the supporting ring is sleeved with a sleeving ring, the exterior of the sleeving ring is communicated with a movable sleeve, and a threaded adjusting seat is installed in the movable sleeve through an insertion structure; a threaded rod is in threaded connection with the interior of the threaded adjusting seat, an expanding hook is rotatably connected to the bottom of the threaded rod, and the sleeving ring is rotated to face the interior of the cavity of the human body, so that the threaded rod and the expanding hook can extend into the oral cavity to form pulling support from outside to inside; and an external rubber layer arranged outside the supporting ring is matched with a positioning bolt, so that the sleeving ring can form a stepless adjustment effect outside the supporting ring, medical staff can adjust the supporting ring at will conveniently according to requirements, additional auxiliary positioning is not needed, the use method is integrally simplified, and the adjustment efficiency of the medical staff is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an oral cavity examination expansion device. Background Technology

[0002] During oral disease diagnosis and treatment, patients need to keep their mouths open for extended periods to receive examinations or treatment. However, prolonged mouth opening can lead to facial muscle fatigue, making it difficult for patients to cooperate for long periods and even causing muscle spasms. This physiological reaction not only forces treatment interruptions and affects the continuity of procedures but also significantly prolongs treatment time and reduces work efficiency.

[0003] Existing oral retractors generally suffer from functional defects: most products employ a fixed structural design, making dynamic adjustment impossible based on differences in the patient's oral cavity morphology. For example, standard oral retractors can only achieve jawbone expansion in a single direction, failing to effectively expand the sides of the mouth laterally. This limitation obstructs the diagnostic field of view, requiring doctors to frequently adjust their observation angles; in some cases, it is even necessary to examine the retractor from the side, increasing both the difficulty of operation and affecting diagnostic accuracy.

[0004] In existing technologies, there are proposed arched expansion segments to reduce the insufficient observation angle of existing expanders and improve the opening stability. However, the arched expansion segments are flat rings, and the overall adjustment uses many mechanical parts such as gears and ratchet plates, making the adjustment more complicated. Furthermore, it is impossible to insert the pulling hook into the oral cavity for pulling support. Therefore, an oral cavity detection expansion device is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an oral cavity examination expansion device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oral cavity examination expansion device, comprising a support ring, the support ring being an open annular shape, a sleeve ring being sleeved on the outside of the support ring, a movable sleeve being connected to the outside of the sleeve ring, a threaded adjustment seat being installed inside the movable sleeve through an insertion structure, a threaded rod being threadedly connected inside the threaded adjustment seat, and an expansion hook being rotatably connected to the bottom of the threaded rod. The support ring has an integrally formed outer rubber layer, and the sleeve ring has a threaded hole on its outside. A positioning bolt is threaded inside the threaded hole. The positioning bolt passes through the threaded hole and fits and squeezes the outer rubber layer to fix and limit the sleeve ring.

[0007] Preferably, the insertion structure includes a rotating seat, which is slidably connected to the inside of the movable sleeve. A positioning cutter is fixedly connected to the outside of the rotating seat. A positioning surface is integrally formed on the outside of the support ring. Multiple positioning metal rods are integrally formed on the outside of the positioning surface. The positioning cutter is inserted into the inside of the multiple positioning metal rods.

[0008] Preferably, the positioning metal rod is integrally formed with an outer high-elastic rubber extrusion seat, and the spacing between multiple outer high-elastic rubber extrusion seats is greater than 0.2mm.

[0009] Preferably, the outer high-elastic rubber extrusion seat is conical, with the tip of the cone facing the rotating seat, and the outer wall surface of the conical outer high-elastic rubber extrusion seat near the positioning surface is integrally formed with a parallel extrusion surface.

[0010] Preferably, the threaded adjusting seat has two rubber extrusion blocks fixedly connected to its exterior, with a snap-fit ​​gap between the two rubber extrusion blocks. The side of the rubber extrusion block closest to the threaded rod is attached to the outer wall of the threaded rod, and a knob is fixedly connected to the top of the threaded rod.

[0011] Preferably, the sleeve ring has multiple universal balls fixedly connected inside, which are used to assist the movement of the sleeve ring on the outer rubber layer.

[0012] Preferably, both the inner wall of the movable sleeve and the outer wall of the rotating seat are fixedly connected with annular blocking blocks.

[0013] Preferably, a magnetic suction plate is fixedly connected inside the support ring.

[0014] Preferably, the positioning cutter plate has multiple backward ratchet plates integrally formed on its exterior. The backward ratchet plates are used to increase the friction between the positioning cutter plate and the outer high-elastic rubber extrusion seat when the positioning cutter plate is inserted into the positioning metal rod.

[0015] Preferably, the outer wall surface of the parallel extrusion surface is integrally formed with multiple magnetic blocks.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the support ring, which is in the shape of a round rod, allows the rotating sleeve ring to face the inside of the human cavity during the adjustment of the direction of the expansion hook. This enables the threaded rod and the expansion hook to be inserted into the oral cavity, forming a pulling support from the outside in. Furthermore, the outer rubber layer on the outside of the support ring, together with the positioning bolt, allows the sleeve ring to achieve a stepless adjustment effect outside the support ring. This allows medical staff to adjust it arbitrarily according to their needs without the need for additional auxiliary positioning, thus simplifying the usage method and improving the adjustment efficiency of medical staff. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the separated state structure of the movable sleeve and the rotating seat in an embodiment of the present invention; Figure 3 This is a side view of the positioning metal rod in an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection state structure between the positioning metal rod and the positioning cutting plate in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the outer high-elasticity rubber extrusion seat in an embodiment of the present invention; Figure 6 This is a schematic diagram of the outer high-elastic rubber extrusion seat in a conical shape, as shown in the embodiment of the present invention. Figure 7 This is a schematic diagram of the barbed magnetic powder capsule structure in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the sleeve structure in an embodiment of the present invention.

[0018] In the diagram: 100, support ring; 101, connecting ring; 102, positioning bolt; 103, moving sleeve; 104, rotating seat; 105, threaded adjusting seat; 106, threaded rod; 107, expansion hook; 108, knob; 109, outer rubber layer; 200, positioning surface; 201, positioning metal rod; 202, positioning cutting plate; 300, outer high-elastic rubber extrusion seat; 301, parallel extrusion surface; 302, backward ratchet plate; 303, magnetic block; 400, magnetic plate; 500, rubber extrusion block; 600, universal ball; 700, annular blocking block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1, such as Figure 1 As shown, this application discloses an oral cavity examination expansion device, including a support ring 100, which is an open annular shape. A sleeve ring 101 is sleeved on the outside of the support ring 100. A movable sleeve 103 is connected to the outside of the sleeve ring 101. A threaded adjustment seat 105 is installed inside the movable sleeve 103 through a plug-in structure. A threaded rod 106 is threadedly connected inside the threaded adjustment seat 105. An expansion hook 107 is rotatably connected to the bottom of the threaded rod 106. The support ring 100 has an integrally formed outer rubber layer 109. The sleeve ring 101 has a threaded hole on its outside. The threaded hole is internally connected to a positioning bolt 102. The positioning bolt 102 is used to pass through the threaded hole and conform to the outer rubber layer 109 to compress the outer rubber layer 109 and fix and limit the sleeve ring 101.

[0021] Specifically, during use, the open annular support ring 100 can be fitted with any number of sleeve rings 101, and after the sleeve rings 101 are fitted, the direction of the threaded adjustment seat 105 can be adjusted through the plug-in structure, such as... Figure 1 As indicated by the arrow, the connecting ring 101 can rotate around the support ring 100, thereby adjusting the threaded rod 106 and the expansion hook 107 to penetrate deep into the human oral cavity during use, allowing them to directly penetrate into the human oral cavity from the outside and form a pulling support position.

[0022] Furthermore, after the sleeve ring 101 is fitted onto the outside of the support ring 100, the operator can adjust the sleeve ring 101 to a designated position outside the support ring 100. After adjusting to the designated position, the operator rotates the threaded rod 106 by holding the knob 108, thereby causing the threaded rod 106 to move up and down inside the threaded adjustment seat 105. When the adjusting threaded rod 106 drives the expansion hook 107 to the designated oral cavity support position, the expansion hook 107 abuts against the support position inside the oral cavity. After abutting, the threaded rod 106 is rotated upward by the knob 108, thereby pulling the expansion hook 107 upward. After pulling the expansion hook 107 upward, the expansion hook 107 will pull the positioning point, thereby forming a fixed expansion point.

[0023] Furthermore, during use, after the sleeve ring 101 is fitted onto the outside of the support ring 100, when it is necessary to fix the sleeve ring 101, the operator can rotate the positioning bolt 102, so that the positioning bolt 102 gradually threads into the inside of the sleeve ring 101. When the positioning bolt 102 contacts the outer wall of the support ring 100, the positioning bolt 102 will first contact the outer rubber layer 109. When the positioning bolt 102 is continuously rotated, it can continuously compress the outer rubber layer 109, forming a positioning effect. Because of the contact and compression between the positioning bolt 102 and the outer rubber layer 109, the positioning bolt 102 will not move or slip outside the outer rubber layer 109 at will, ensuring the positioning stability of the positioning bolt 102 on the sleeve ring 101.

[0024] like Figure 2As shown, the threaded adjusting seat 105 is externally fixedly connected to two rubber extrusion blocks 500, and a snap-fit ​​gap is formed between the two rubber extrusion blocks 500. The side of the rubber extrusion block 500 near the threaded rod 106 is attached to the outer wall of the threaded rod 106, and a knob 108 is fixedly connected to the top of the threaded rod 106.

[0025] Specifically, during use, the threaded adjusting seat 105 has an internal thread, and the threaded rod 106 has an external thread. When the threaded rod 106 is rotated, the internal and external threads of the threaded rod 106 and the threaded adjusting seat 105 connect with each other, thereby adjusting the position of the threaded rod 106 inside the threaded adjusting seat 105. Furthermore, during use, the threaded adjusting seat 105 is externally connected to two rubber compression blocks 500. These two rubber compression blocks 500 are made of soft material, and the two rubber compression blocks 500... The separation between the two parts allows medical staff to more easily press the threaded rod 106 into the threaded adjustment seat 105 when inserting it into the threaded adjustment seat 105. The elastic rubber extrusion block 500 not only fits the threaded rod 106 to limit its movement, but also allows the rubber extrusion block 500 to deform when the threaded rod 106 is pulled outward, without forming a hard limit. This makes it easy for staff to remove the threaded rod 106 from the inside of the threaded adjustment seat 105.

[0026] like Figure 8 As shown, multiple universal balls 600 are fixedly connected inside the sleeve ring 101. The universal balls 600 are used to assist the movement of the sleeve ring 101 on the outer rubber layer 109.

[0027] Specifically, during use, when the sleeve 101 moves outside the support ring 100, the external rubber layer 109 increases the friction between it and the sleeve 101. This may cause the sleeve 101 to have difficulty moving on the outer wall of the external rubber layer 109 due to continuous friction between them. However, by setting multiple universal balls 600, the movement of the sleeve 101 outside the external rubber layer 109 can be assisted. The universal balls 600 can support the contact surface between the sleeve 101 and the external rubber layer 109, reducing the friction between them, thereby assisting the movement of the sleeve 101 outside the external rubber layer 109.

[0028] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: Compared with the prior art, in this embodiment, the support ring 100 in the form of a round rod enables the rotating sleeve ring 101 to face the inside of the human cavity during the adjustment of the direction of the expansion hook 107, thereby allowing the threaded rod 106 and the expansion hook 107 to penetrate into the oral cavity, forming a pull support from the outside in. Furthermore, the setting of the outer rubber layer 109 on the outside of the support ring 100, in conjunction with the positioning bolt 102, enables the sleeve ring 101 to form a stepless adjustment effect outside the support ring 100, which is convenient for medical staff to adjust arbitrarily according to their needs without the need for additional auxiliary positioning, thus simplifying the usage method and improving the adjustment efficiency of medical staff.

[0029] Example 2: Considering that medical staff not only need to adjust the position of the expansion hook 107 towards the inside of the human body cavity, but also need to adjust the rotation angle centered on the movable sleeve 103 according to the patient's condition, so that when the sleeve ring 101 moves outside the support ring 100, the expansion hook 107 can be rotated and adjusted to a suitable position, but when adjusting with the movable sleeve 103 as the adjustment center, the existing positioning structures are mostly quite complex, using a combination of gears or lead screws to form a rotational positioning effect. This makes these structures quite precise, and once a part is misaligned, it cannot be used. Furthermore, dirt easily accumulates inside these precision parts during long-term use, making them difficult to clean. To address the above technical problems, this application proposes a plug-in structure to solve the above technical problems, specifically: like Figures 2-4 As shown, the plug-in structure includes a rotating seat 104, which is slidably connected to the inside of the movable sleeve 103. A positioning cutter 202 is fixedly connected to the outside of the rotating seat 104. A positioning surface 200 is integrally formed on the outside of the support ring 100. Multiple positioning metal rods 201 are integrally formed on the outside of the positioning surface 200. The positioning cutter 202 is plugged into the inside of the multiple positioning metal rods 201.

[0030] Specifically, during use, the operator can pull the rotating seat 104 outwards, causing it to move towards the outlet position of the movable sleeve 103. As the rotating seat 104 gradually moves out of the movable sleeve 103, the positioning cutter 202 will separate from the multiple positioning metal rods 201. When the positioning cutter 202 separates from the positioning metal rods 201, medical personnel can hold the threaded adjustment seat 105 and rotate the threaded adjustment seat 105 and the threaded rod 106 around the rotating seat 104 as the center point. The rotation direction is as follows: Figure 2As indicated by the middle arrow, after the medical staff rotates to a certain angle, they can push the rotating seat 104 into the moving sleeve 103. After the rotating seat 104 moves into the moving sleeve 103, the positioning cutting plate 202 will enter the moving sleeve 103 along with the rotating seat 104. As the positioning cutting plate 202 gradually enters the moving sleeve 103, it will come into contact with multiple positioning metal rods 201. As the positioning cutting plate 202 goes deeper, it can be inserted between the multiple positioning metal rods 201. The multiple positioning metal rods 201 will limit the external positioning of the positioning cutting plate 202. With the multiple positioning metal rods 201 limiting the positioning cutting plate 202, it can be ensured that the rotating seat 104 drives the threaded adjustment seat 105 to tilt at a specified angle without any random rotation. The overall positioning structure is not complicated, which makes it convenient for medical staff to adjust it as needed.

[0031] like Figure 5 As shown, a magnetic suction plate 400 is fixedly connected inside the support ring 100.

[0032] Specifically, by setting up the magnetic plate 400, when the positioning cutter 202 is inserted into the gap between multiple positioning metal rods 201, the magnetic plate 400 can attract the positioning cutter 202, ensuring that the positioning cutter 202 can fit against the outer wall cut surface of the support ring 100, and preventing the positioning cutter 202 from moving randomly inside the movable sleeve 103.

[0033] like Figure 8 As shown, both the inner wall of the movable sleeve 103 and the outer wall of the rotating seat 104 are fixedly connected with annular blocking blocks 700.

[0034] Specifically, during use, the annular blocking blocks 700, which are fixedly connected to both the inner wall of the movable sleeve 103 and the outer wall of the rotating seat 104, prevent the rotating seat 104 from coming out of the movable sleeve 103 when it moves inside the movable sleeve 103. This reduces the likelihood of the rotating seat 104 coming out of the movable sleeve 103 under stress.

[0035] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: Compared with Embodiment 1, in this embodiment, the positioning cutter 202 is inserted between multiple positioning metal rods 201 by rotating the seat 104, which can limit the threaded adjustment seat 105 and the threaded rod 106. The rotation angle of the threaded adjustment seat 105 and the threaded rod 106 can be adjusted arbitrarily as needed. It is only necessary to rotate the positioning cutter 202 and insert it into the gaps of different positioning metal rods 201. The whole does not require complex mechanical parts to form a positioning and limiting effect. Furthermore, the rotation angle of the threaded adjustment seat 105 and the threaded rod 106 can also be adjusted arbitrarily, making it more convenient for medical personnel to adjust and use.

[0036] Example 3: Considering that when adjusting the rotation angle of the threaded adjusting seat 105 and the threaded rod 106, the positioning cutter 202 is inserted into the gaps of multiple positioning metal rods 201. However, when the positioning cutter 202 is inserted into the gaps of the positioning metal rods 201, there is always a certain gap between the positioning metal rods 201 and the positioning cutter 202. This results in a relatively loose relationship between the positioning cutter 202 and the positioning metal rods 201. When this looseness occurs, continuous shaking between the positioning cutter 202 and the positioning metal rods 201 can easily occur, leading to instability during use. To address the above technical problems, this application proposes the following technical solution: like Figure 5 As shown, the positioning metal rod 201 has an outer high-elastic rubber extrusion seat 300 integrally formed on its exterior, and the spacing between multiple outer high-elastic rubber extrusion seats 300 is greater than 0.2mm.

[0037] Specifically, during use, the outer high-elastic rubber extrusion seat 300 outside the positioning metal rod 201 can fill the gaps between multiple positioning metal rods 201. While filling the gaps between the positioning metal rods 201, the outer high-elastic rubber extrusion seat 300's own deformation properties allow the positioning cutting plate 202 to be inserted between multiple outer high-elastic rubber extrusion seats 300. When the positioning cutting plate 202 is inserted between multiple positioning metal rods 201, it will compress the outer high-elastic rubber extrusion seat 300 located outside the positioning metal rods 201, causing the outer high-elastic rubber extrusion seat 300 to deform. When the outer high-elastic rubber extrusion seat 300 deforms, on the one hand, it can fit the positioning cutter 202 to reduce the looseness between the positioning cutter 202 and the positioning metal rod 201, and reduce the instability of the positioning cutter 202 in the gap of the positioning metal rod 201. On the other hand, it can also increase the friction between the positioning metal rod 201 and the positioning cutter 202, thereby further reducing the phenomenon that the positioning cutter 202 and the positioning metal rod 201 will easily separate when the threaded rod 106 is subjected to excessive force. And when the gap is at least greater than 0.2mm, it can ensure that the positioning cutter 202 is inserted into the corresponding positioning cutter 202 gap.

[0038] Considering that when multiple positioning metal rods 201 are filled with gaps via outer high-elasticity rubber compression seats 300, small gaps may prevent medical staff from accurately inserting the positioning cutting plate 202 into the gaps between the multiple outer high-elasticity rubber compression seats 300, therefore... Figure 6 As shown, the outer high-elastic rubber extrusion seat 300 is conical, with the tip of the cone facing the rotating seat 104. The outer wall surface of the conical outer high-elastic rubber extrusion seat 300 near the positioning surface 200 is integrally formed with a parallel extrusion surface 301.

[0039] Specifically, during use, when the operator pushes the rotating seat 104 and the positioning cutter 202 into the interior of the multiple positioning metal rods 201, the conical surface of the outer high-elastic rubber extrusion seat 300 will guide the positioning cutter 202 to the designated insertion position. After the positioning cutter 202 is guided to the side wall of the support ring 100, the parallel extrusion surface 301 at the bottom of the outer high-elastic rubber extrusion seat 300 consists of multiple parallel surfaces. The presence of multiple parallel surfaces will form a planar contact state with the positioning cutter 202, thereby forming a contact and limiting effect on the outer wall of the positioning cutter 202, thus forming an overall effect of upper guidance and lower limiting.

[0040] like Figure 8As shown, the positioning cutter 202 has multiple backward ratchet plates 302 integrally formed on its exterior. The backward ratchet plates 302 are used to increase the friction between the positioning cutter 202 and the outer high-elastic rubber extrusion seat 300 when the positioning cutter 202 is inserted into the positioning metal rod 201.

[0041] Specifically, during use, when the staff inserts the positioning cutting plate 202 into the gap between multiple positioning metal rods 201, the backward ratchet plate 302 located outside the positioning cutting plate 202 increases the friction between the parallel extrusion surfaces 301, preventing the expansion hook 107 from pulling the positioning cutting plate 202 out of the gap between the multiple positioning metal rods 201 when the patient bites the expansion hook 107 forcefully.

[0042] like Figure 6 As shown, the outer wall of the parallel extrusion surface 301 is integrally formed with multiple magnetic blocks 303. With the setting of the magnetic blocks 303, when the positioning cutter 202 is attached to the outside of the parallel extrusion surface 301, the magnetic plate 400 can simultaneously attract the positioning cutter 202, ensuring its stability when attached to the outside of the parallel extrusion surface 301.

[0043] like Figure 7 As shown, the present invention also proposes that a coil be wound around the magnetic suction plate 400 and a battery be used externally for conduction, thereby making the magnetic suction plate 400 an electromagnet. Furthermore, a barbed magnetic powder bag is provided on the outside of the outer high-elastic rubber extrusion seat 300. When the positioning cutter 202 is inserted between multiple positioning metal rods 201, the barbed magnetic powder bag will form a fastening with the backward ratchet plate 302. After the fastening is formed, the electromagnet is activated again, which can form an electromagnet adsorbing magnetic powder bag, strengthening the fastening state between the magnetic powder bag and the backward ratchet plate 302, and ensuring the insertion stability of the positioning cutter 202.

[0044] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: Compared with Embodiment 2, in this embodiment, the spacing between multiple positioning metal rods 201 is reduced by the soft outer high-elastic rubber extrusion seat 300, thereby extruding the positioning cutting plate 202 when it is inserted between the multiple positioning metal rods 201, preventing the positioning cutting plate 202 from becoming too loose and unstable between the positioning metal rods 201. Furthermore, when the multiple outer high-elastic rubber extrusion seats 300 extrude pressure between the positioning cutting plate 202, the friction between the positioning metal rods 201 and the positioning cutting plate 202 is increased, preventing the separation of the positioning cutting plate 202 and the positioning metal rods 201. Moreover, the conical outer high-elastic rubber extrusion seat 300 and the parallel extrusion surface 301 allow medical personnel to quickly insert the positioning cutting plate 202 into the gap between the multiple positioning metal rods 201, improving the efficiency of the user.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oral cavity examination expansion device, comprising a support ring (100), characterized in that: The support ring (100) is an open annular shape. A sleeve ring (101) is sleeved on the outside of the support ring (100). A movable sleeve (103) is connected to the outside of the sleeve ring (101). A threaded adjusting seat (105) is installed inside the movable sleeve (103) through a plug-in structure. A threaded rod (106) is threadedly connected inside the threaded adjusting seat (105). An expansion hook (107) is rotatably connected to the bottom of the threaded rod (106). The support ring (100) has an integrally formed outer rubber layer (109) on its outside. The sleeve ring (101) has a threaded hole on its outside. The threaded hole is threaded with a positioning bolt (102). The positioning bolt (102) is used to pass through the threaded hole and fit and squeeze the outer rubber layer (109) to fix and limit the sleeve ring (101).

2. The oral cavity examination expansion device according to claim 1, characterized in that: The plug-in structure includes a rotating seat (104), which is slidably connected to the inside of the movable sleeve (103). A positioning cutter (202) is fixedly connected to the outside of the rotating seat (104). A positioning surface (200) is integrally formed on the outside of the support ring (100). A plurality of positioning metal rods (201) are integrally formed on the outside of the positioning surface (200). The positioning cutter (202) is plugged into the inside of the plurality of positioning metal rods (201).

3. The oral cavity examination expansion device according to claim 2, characterized in that: The positioning metal rod (201) is integrally formed with an outer high-elastic rubber extrusion seat (300), and the distance between multiple outer high-elastic rubber extrusion seats (300) is greater than 0.2mm.

4. The oral cavity examination expansion device according to claim 3, characterized in that: The outer high-elastic rubber extrusion seat (300) is conical, with the tip of the cone facing the rotating seat (104). The outer wall surface of the conical outer high-elastic rubber extrusion seat (300) near the positioning surface (200) is integrally formed with a parallel extrusion surface (301).

5. The oral cavity examination expansion device according to claim 1, characterized in that: The threaded adjustment seat (105) is externally fixedly connected to two rubber extrusion blocks (500), and a snap-fit ​​gap is formed between the two rubber extrusion blocks (500). The side of the rubber extrusion block (500) near the threaded rod (106) is attached to the outer wall of the threaded rod (106), and a knob (108) is fixedly connected to the top of the threaded rod (106).

6. The oral cavity examination expansion device according to claim 1, characterized in that: The sleeve (101) is internally fixedly connected with a plurality of universal balls (600), which are used to assist the movement of the sleeve (101) on the outer rubber layer (109).

7. The oral cavity examination expansion device according to claim 4, characterized in that: Both the inner wall of the movable sleeve (103) and the outer wall of the rotating seat (104) are fixedly connected with annular blocking blocks (700).

8. The oral cavity examination expansion device according to claim 1, characterized in that: A magnetic suction plate (400) is fixedly connected inside the support ring (100).

9. The oral cavity examination expansion device according to claim 7, characterized in that: The positioning cutter (202) has multiple backward ratchet plates (302) integrally formed on its exterior. The backward ratchet plates (302) are used to increase the friction between the positioning cutter (202) and the outer high-elastic rubber extrusion seat (300) when the positioning cutter (202) is inserted into the positioning metal rod (201).

10. The oral cavity examination expansion device according to claim 9, characterized in that: The outer wall of the parallel extrusion surface (301) is integrally formed with multiple magnetic blocks (303).

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