Oral cavity expander for department of stomatology

Abstract

The utility model belongs to the technical field of oral cavity expansion, and particularly provides an oral cavity expander for the department of stomatology, which comprises a lower support frame and an upper support frame, the upper support frame is rotatably arranged on the lower support frame, a lock cylinder part is arranged on the upper wall of the lower support frame, and a key part is arranged on the inner side wall of the upper support frame. Switching of the locking state is achieved through the rotation effect generated by guiding of the inclined groove, the oral cavity expanding device is restored through the magnetic force effect, and therefore the occlusion locking effect and the occlusion unlocking effect are achieved, expanding of the oral cavity of a patient and retracting of the oral cavity expanding device do not need to be operated by medical staff at all, and the operation is simple and convenient. All the functions can be achieved only by the pure occlusion action of a patient on the oral cavity expander, the oral cavity expanding efficiency is remarkably improved, the operation difficulty of medical staff is reduced, the expanding process is elastic expanding, and the comfort of the patient can be better improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oral cavity expansion and support, in particular to an oral cavity expander for stomatology. Background Art

[0002] The oral expander can expand the patient's oral cavity, reduce the discomfort caused by the patient's long-term mouth opening, and facilitate medical staff to check the patient's oral cavity. However, the oral expanders in the prior art generally have the following problems:

[0003] Almost all oral expanders in the prior art require medical staff to operate in order to expand the patient's mouth. Whether it is a clamp-type expander or other forms, it needs to rely on medical staff to control to ensure the stability of the expansion. Although this can ensure that the patient's mouth is in an expanded state, it increases the difficulty of operation for medical staff.

[0004] The prior art lacks an oral expander that does not require operation by medical staff, can automatically unlock and expand the oral cavity only by relying on the occlusion of the patient's oral cavity, and can automatically restore the lock with the help of the occlusion. Utility Model Content

[0005] The utility model overcomes the deficiencies of the prior art and provides an oral expander for stomatology, which utilizes the rotational action generated by the inclined groove guide to achieve the switching of the locking state, and relies on the magnetic action to restore the oral expander, thereby achieving the bite locking and bite unlocking effects. The expansion of the patient's mouth by the oral expander and the retraction of the oral expander do not require any operation by medical staff, and all functions can be achieved by the patient only needing to perform a pure bite action on the oral expander, thereby significantly improving the oral expansion efficiency and reducing the difficulty of operation for medical staff. In addition, the expansion process is an elastic expansion, which can further improve the comfort of the patient.

[0006] The technical scheme adopted by the utility model is as follows: the scheme provides an oral expander for stomatology, including a lower support frame and an upper support frame, the upper support frame is rotatably arranged on the lower support frame, a fixed shaft is arranged on the lower support frame, and the side walls at both ends of the upper support frame facing each other are respectively fixed with rotating shafts, and the two ends of the rotating shaft are respectively rotatably connected with the two ends of the fixed shaft, and an expansion torsion spring is arranged on the outer movable sleeve of the rotating shaft, and the two ends of the expansion torsion spring are respectively connected to the side wall of the end of the upper support frame and the end of the fixed shaft, and the torsional elastic effect of the expansion torsion spring enables the upper support frame and the lower support frame to have an expansion function, a lock core component is arranged on the upper wall of the lower support frame, and a key component is arranged on the inner wall of the upper support frame, and the lock core component is located on the movement path of the key component, and the lock core component is located on the movement path of the key component. The core component includes a lower support, a reset bracket and a spin lock core. The lower support is fixedly arranged on the upper wall of the lower support frame, the reset bracket is rotatably arranged on the inner side wall of the lower support, the spin lock core is rotatably arranged on the inner side wall of the reset bracket, the spin lock core is a hollow cylindrical structure, a lock tongue is slidably penetrated through the side wall of the spin lock core, an unlocking groove is engraved on the inner circumferential wall of the spin lock core, the key component includes an upper support and a plug rod, the upper support is fixedly arranged on the inner side wall of the upper support frame, the plug rod is hingedly arranged on the inner side wall of the upper support, the lower end of the plug rod faces the spin lock core, a wedge-shaped lock opening is opened on the side wall of the plug rod, an unlocking linkage rod is slidably arranged on the side wall of the plug rod, after the plug rod is inserted into the spin lock core, the end of the unlocking linkage rod is movably inserted into the unlocking groove, and the wedge-shaped lock opening corresponds to the lock tongue.

[0007] In the present scheme, a first magnetic block and a second magnetic block are embedded in the outer circumferential side wall of the spin lock core, the first magnetic block and the second magnetic block are arranged back to back, and the outer wall magnetic poles of the first magnetic block and the second magnetic block are opposite, and a third magnetic block and a fourth magnetic block are embedded in the inner circumferential wall of the reset bracket, the third magnetic block and the fourth magnetic block are arranged facing each other, and the side wall magnetic poles of the third magnetic block and the fourth magnetic block are opposite, when the first magnetic block approaches the third magnetic block, the second magnetic block approaches the fourth magnetic block, and the side wall magnetic poles of the first magnetic block and the third magnetic block are opposite, and the side wall magnetic poles of the second magnetic block and the fourth magnetic block are opposite, and the above-mentioned magnetic pole arrangement method enables the spin lock core to automatically rotate to the initial state in the reset bracket, that is, the first magnetic block always tends to approach the third magnetic block, and the second magnetic block always tends to approach the fourth magnetic block.

[0008] The unlocking groove is formed by connecting an insertion vertical groove, an oblique groove and a withdrawal vertical groove in sequence. The upper ends of the insertion vertical groove and the withdrawal vertical groove both penetrate the upper wall of the spin lock cylinder. The two ends of the oblique groove are respectively connected to the lower ends of the insertion vertical groove and the withdrawal vertical groove. The engraving depth of the oblique groove gradually decreases from the insertion vertical groove to the withdrawal vertical groove. An anti-rotation blocking surface is provided on one side of the withdrawal vertical groove close to the end of the oblique groove.

[0009] The upper wall of one end of the lock tongue close to the inside of the spin lock core is a wedge-shaped surface, and an elastic bandage is provided on the outer circumferential side wall of the spin lock core. The two ends of the elastic bandage are respectively located on both sides of the lock tongue, and the middle part of the elastic bandage contacts the end of the lock tongue. The elastic bandage makes the lock tongue tend to move toward the inside of the spin lock core.

[0010] Furthermore, a first spring sheet is fixedly provided inside the insertion rod, and the side wall of the first spring sheet is in elastic contact with the end of the unlocking linkage rod close to the inside of the insertion rod. The first spring sheet causes the unlocking linkage rod to have a tendency to move outward. After the unlocking linkage rod is pressed and released, the first spring sheet can cause the unlocking linkage rod to pop out to its initial state.

[0011] Furthermore, a second spring sheet is connected between the upper wall of the lower support and the lower wall of the reset bracket to prevent the reset bracket from rotating unsteadily. A third spring sheet is fixedly provided on the lower wall of the upper support, and the third spring sheet is in elastic contact with the side wall of the insertion rod. The reset bracket and the lower support are rotatably arranged, and the insertion rod and the upper support are rotatably arranged so that the insertion rod and the spin lock core have an angle adjustment function. In the process of the lower support frame and the upper support frame approaching and moving away, due to the change in angle, the insertion rod and the spin lock core will not be coaxial in a natural state. Therefore, the insertion rod and the spin lock core in the above-mentioned arrangement can automatically adjust the angle and automatically maintain a coaxial state after the two are in contact, thereby ensuring that the insertion rod can be smoothly inserted into and removed from the spin lock core.

[0012] A lower bite plate is fixedly provided on the lower wall of the lower support frame, and an upper bite plate is fixedly provided on the upper wall of the upper support frame.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The oral expander for oral care proposed by the utility model utilizes the rotational action generated by the inclined groove guide to achieve the switching of the locking state, and relies on the magnetic force to restore the oral expander, thereby achieving the bite locking and bite unlocking effects. The oral expander does not require any operation by medical staff to expand the patient's mouth or to retract the oral expander. The patient only needs to perform a pure bite action on the oral expander to achieve all functions, which significantly improves the oral expansion efficiency and reduces the difficulty of operation for medical staff. In addition, the expansion process is elastic expansion, which can further improve the comfort of patients.

[0015] (2) When the oral expander is engaged and the upper support frame and the lower support frame are locked, the patient hears a sound when the end of the lock tongue bounces into the wedge-shaped lock mouth, indicating that the upper support frame and the lower support frame are locked. When the bite action continues, due to the special inclined groove structure design of the unlocking groove, the spin lock core rotates, so that the lock tongue is transferred and no longer locks the wedge-shaped lock mouth, so that the upper support frame and the lower support frame are unlocked and expanded. The locking and unlocking of the oral expander can be achieved only by the patient's bite action on the oral expander. Therefore, the use and recovery method of the oral expander is very simple;

[0016] (3) The magnetic poles of the first and second magnetic blocks provided on the spin lock core and the third and fourth magnetic blocks provided on the reset bracket are arranged in such a manner that the spin lock core can automatically rotate to the initial state in the reset bracket, thereby ensuring that the insertion vertical slot is again located on the movement path of the end of the unlocking linkage rod, and the lock tongue is again located on the movement path of the wedge-shaped lock opening, thereby ensuring the effectiveness of the next locking;

[0017] (4) The anti-rotation blocking surface can prevent the unlocking linkage rod from returning to the inclined groove, thereby ensuring that the spin lock core will not rotate during the process of the plug rod being pulled out, that is, the lock tongue will not block the movement of the wedge-shaped lock mouth, ensuring that the plug rod can smoothly detach from the spin lock core;

[0018] (5) The reset bracket is rotatably arranged with the lower support, and the insertion rod is rotatably arranged with the upper support. The above arrangement enables the insertion rod and the spin lock core to have an angle adjustment function. During the process of the lower support bracket and the upper support bracket approaching and moving away from each other, due to the change in angle, the insertion rod and the spin lock core will not be coaxial in a natural state. Therefore, the above arrangement method can automatically adjust the angle of the insertion rod and the spin lock core and automatically maintain a coaxial state after the two are in contact, thereby ensuring that the insertion rod can be smoothly inserted into and removed from the spin lock core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of a dental oral expander proposed in Example 1 is shown in FIG. Figure 1 ;

[0020] Figure 2 The structure of a dental oral expander proposed in Example 1 is shown in FIG. Figure 2 ;

[0021] Figure 3 The structure of a dental oral expander proposed in Example 1 is shown in FIG. Figure 3 ;

[0022] Figure 4 This is a schematic diagram of the structure of the lock core component proposed by the utility model;

[0023] Figure 5 A top view of the lock core component provided in the first embodiment;

[0024] Figure 6 The lock core member provided in the first embodiment Figure 5 A cross-sectional view of section bb in;

[0025] Figure 7 The lock core member provided in the first embodiment Figure 5 The three-dimensional cross-sectional structure diagram of the cc section;

[0026] Figure 8 for Figure 7 A partial enlarged view of part A in FIG.

[0027] Fig. 9 A side cross-sectional view of the key component provided by the utility model;

[0028] Fig.10 The key piece provided by the utility model is along Figure 8 A cross-sectional view of section aa in FIG.

[0029] Fig.11 This is a schematic diagram of the structure of an oral expander for stomatology proposed in Example 2.

[0030] Among them, 1, lower support frame, 11, lock core member, 111, lower support, 1111, second spring piece, 112, reset bracket, 1121, third magnetic block, 1122, fourth magnetic block, 113, spin lock core, 1131, first magnetic block, 1132, second magnetic block, 114, lock tongue, 1141, wedge surface, 115, unlocking groove, 1151, insert vertical groove, 1152, oblique groove, 1153, pull out vertical groove, 1154, Anti-rotation blocking surface, 1155, embedded table, 116, elastic bandage, 12, lower bite plate, 2, upper support frame, 21, key piece, 211, upper support, 2111, third spring piece, 212, insertion rod, 2120, inverted round table end, 2121, wedge-shaped lock, 2122, unlocking linkage rod, 2123, first spring piece, 22, upper bite plate, 3, expansion torsion spring, 4, fixed shaft, 41, limit block, 5, rotating shaft, 51, stop block.

[0031] Figure 5 In the figure, S and N represent the directions of magnetic poles.

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Example 1: Please refer to Figure 1-Figure 4In this embodiment, an oral expander for oral cavity department comprises a lower support frame 1 and an upper support frame 2. A lower bite plate 12 is fixedly arranged on the lower wall of the lower support frame 1, and an upper bite plate 22 is fixedly arranged on the upper wall of the upper support frame 2. A fixed shaft 4 is arranged on the lower support frame 1. The side walls at both ends of the upper support frame 2 facing each other are respectively fixedly provided with rotating shafts 5. The ends of the two rotating shafts 5 are respectively rotatably connected with the two ends of the fixed shaft 4. An expansion torsion spring 3 is movably sleeved outside the rotating shaft 5. The two ends of the expansion torsion spring 3 are respectively connected with the side wall of the end of the upper support frame 2 and the end of the fixed shaft 4. The torsional elasticity of the expansion torsion spring 3 can make the upper support frame 2 and the lower support frame 2 rotate. 1 has an expansion function, a lock core member 11 is arranged on the upper wall of the lower support frame 1, a key member 21 is arranged on the inner wall of the upper support frame 2, the lock core member 11 is located on the movement path of the key member 21, the lock core member 11 comprises a lower support 111, a reset bracket 112 and a spin lock core 113, the lower support 111 is fixedly arranged on the upper wall of the lower support frame 1, the reset bracket 112 is rotatably arranged on the inner wall of the lower support 111, a second elastic piece 1111 is connected between the upper wall of the lower support 111 and the lower wall of the reset bracket 112 to prevent the reset bracket 112 from rotating and becoming unstable, and the spin lock core 113 is rotatably arranged on the inner wall of the reset bracket 112.

[0035] like Figure 4-Figure 8 As shown, the spin lock core 113 is a hollow cylindrical structure, and the outer circumferential side wall of the spin lock core 113 is embedded with a first magnetic block 1131 and a second magnetic block 1132, and the first magnetic block 1131 and the second magnetic block 1132 are arranged back to back, as shown in FIG. Figure 5 As shown, the outer wall magnetic pole of the first magnetic block 1131 is the S pole, the outer wall magnetic pole of the second magnetic block 1132 is the N pole, the inner circumferential wall of the reset bracket 112 is embedded with a third magnetic block 1121 and a fourth magnetic block 1122, the third magnetic block 1121 and the fourth magnetic block 1122 are arranged opposite to each other, the side wall magnetic pole of the third magnetic block 1121 close to the spin lock core 113 is the N pole, the side wall magnetic pole of the fourth magnetic block 1122 close to the spin lock core 113 is the S pole, when the first magnetic block 1131 is close to the third magnetic block 1121, the second magnetic block 1132 is close to the fourth magnetic block 1122, the above magnetic pole arrangement method makes the first magnetic block 1131 always close to the third magnetic block 1121 under the action of magnetic force The magnetic block 1121 tends to rotate the spin lock core 113 automatically to the initial state in the reset bracket 112. The side wall of the spin lock core 113 is slidably penetrated by a lock tongue 114. The upper wall of the lock tongue 114 close to the inner side of the spin lock core 113 is a wedge-shaped surface 1141. The outer circumferential side wall of the spin lock core 113 is provided with an elastic bandage 116. The two ends of the elastic bandage 116 are respectively located on both sides of the lock tongue 114. The middle part of the elastic bandage 116 contacts the end of the lock tongue 114. The elastic bandage 116 makes the lock tongue 114 have a tendency to move toward the inside of the spin lock core 113. The inner circumferential wall of the spin lock core 113 is engraved with an unlocking groove 115. For details, refer to Figure 7 and Figure 8The unlocking slot 115 is formed by connecting the insertion vertical slot 1151, the inclined slot 1152 and the extraction vertical slot 1153 in sequence. The upper ends of the insertion vertical slot 1151 and the extraction vertical slot 1153 both penetrate the upper wall of the spin lock cylinder 113. The length of the insertion vertical slot 1151 is shorter than the extraction vertical slot 1153. The two ends of the inclined slot 1152 are respectively connected to the lower ends of the insertion vertical slot 1151 and the lower ends of the extraction vertical slot 1153. The inclined slot 1152 is connected from the lower end of the insertion vertical slot 1151 to the extraction vertical slot 1153. The height of the groove 1153 in the lower end direction gradually decreases, and the engraving depth of the inclined groove 1152 on the inner circumferential wall of the spin lock core 113 gradually decreases from the insertion vertical groove 1151 to the extraction vertical groove 1153. Due to the change in the engraving depth, one end of the inclined groove 1152 close to the extraction vertical groove 1153 forms an embedded platform 1155 with the inner wall of the extraction vertical groove 1153, that is: an anti-rotation blocking surface 1154 is provided on one side of the extraction vertical groove 1153 close to the end of the inclined groove 1152.

[0036] like Figure 2-Figure 10 As shown, the key member 21 includes an upper support 211 and an insertion rod 212. The upper support 211 is fixedly arranged on the inner wall of the upper support frame 2. The insertion rod 212 is hingedly arranged on the inner wall of the upper support 211. A third elastic piece 2111 is fixedly arranged on the lower wall of the upper support 211. The third elastic piece 2111 is in elastic contact with the side wall of the insertion rod 212. The lower end of the insertion rod 212 faces the spin lock cylinder 113. The lower end of the insertion rod 212 is a rounded table end 2120. The rounded table end 2120 is more convenient for inserting the rod 21 2 Insert the spin lock cylinder 113, a wedge-shaped lock opening 2121 is provided on the side wall of the insert rod 212, an unlocking linkage rod 2122 is slidably provided on the side wall of the insert rod 212, a first elastic piece 2123 is fixedly provided inside the insert rod 212, the side wall of the first elastic piece 2123 is in elastic contact with the end of the unlocking linkage rod 2122 close to the inside of the insert rod 212, the first elastic piece 2123 makes the unlocking linkage rod 2122 have a tendency to move outwards, after the unlocking linkage rod 2122 is pressed and released, The first spring piece 2123 can make the unlocking linkage rod 2122 pop out to the initial state. In the initial state, the insertion vertical slot 1151 is located on the movement path of the unlocking linkage rod 2122. After the insertion rod 212 is inserted into the spin lock cylinder 113, the end of the unlocking linkage rod 2122 is first stuck in the insertion vertical slot 1151, and the wedge-shaped lock mouth 2121 corresponds to the lock tongue 114; the reset bracket 112 and the lower support 111 are rotatably arranged, and the insertion rod 212 and the upper support 211 are rotatably arranged so that the insertion rod 212 and the spin lock cylinder 113 have an angle adjustment function. In the process of the lower support frame 1 and the upper support frame 2 approaching and moving away, due to the change of angle, the insertion rod 212 and the spin lock cylinder 113 will not be coaxial in the natural state. Therefore, the insertion rod 212 and the spin lock cylinder 113 in the above-mentioned arrangement method can automatically adjust the angle and automatically maintain a coaxial state after the two are in contact, thereby ensuring that the insertion rod 212 can be smoothly inserted into and removed from the spin lock cylinder 113.

[0037] In the initial state, the insertion rod 212 is inserted into the spinning lock core 113, the outer end of the unlocking linkage rod 2122 is located in the insertion vertical groove 1151, and the end of the wedge surface 1141 of the lock tongue 114 is inserted into the wedge-shaped lock opening 2121. At this time, the locking arrangement of the lock tongue 114 and the wedge-shaped lock opening 2121 causes the insertion rod 212 to be locked in the spinning lock core 113, thereby locking the upper support frame 2 on the lower support frame 1, and the oral expander is in a locked state in the initial state.

[0038] When the operator uses it, he puts the oral expander for oral care in this embodiment into the oral cavity, and makes the lower teeth bite the lower bite plate 12, and the upper teeth bite the upper bite plate 22, and then bites. Due to the bite, the upper support frame 2 will further move to the lower support frame 1, so that the insertion rod 212 moves downward toward the spin lock cylinder 113. During this process, the outer end of the unlocking linkage rod 2122 will enter the inclined groove 1152, and the unlocking linkage rod 2122 is restricted by the insertion rod 212 and can only move downward relative to the spin lock cylinder 113. The movement of the locking rod 113 and the inclined guiding effect of the inclined groove 1152 will cause the spin lock cylinder 113 to rotate as a whole. Since the depth of the inclined groove 1152 in the inner circumferential wall of the spin lock cylinder 113 gradually decreases from inserting the vertical groove 1151 to pulling out the vertical groove 1153, during the rotation of the spin lock cylinder 113, the unlocking linkage rod 2122 will be squeezed by the inner wall of the inclined groove 1152 and slide into the inside of the insertion rod 212. When the end of the unlocking linkage rod 2122 passes over the inclined groove 1152 and the anti-rotation blocking surface 1154 and enters the pulling out vertical groove 1153, the first spring piece 2123 causes the unlocking linkage rod 2122 to rotate. The rod 2122 is fully ejected. At this time, the rotation of the spin lock core 113 is completed. During the rotation of the spin lock core 113, the wedge-shaped surface 1141 of the lock tongue 114 is squeezed by the wedge-shaped lock opening 2121 and the outer wall of the insertion rod 212 and slides toward the outside of the spin lock core 113. After the spin lock core 113 is rotated, the lock tongue 114 no longer corresponds to the wedge-shaped lock opening 2121. At this time, the patient slowly opens the upper and lower jaws, and the torsional force of the expansion torsion spring 3 will slowly expand the upper support frame 2 and the lower support frame 1. In this process, the insertion rod 212 moves upward relative to the spin lock core 113. Movement, the end of the unlocking linkage rod 2122 moves upward along the pull-out vertical groove 1153, and the anti-rotation blocking surface 1154 can prevent the unlocking linkage rod 2122 from returning to the inclined groove 1152, thereby ensuring that the spin lock cylinder 113 does not rotate at this stage. Since the lock tongue 114 has rotated away from the initial position, the wedge-shaped lock mouth 2121 will no longer contact the lock tongue 114, and the insertion rod 212 will smoothly leave the spin lock cylinder 113, the upper support frame 2 and the lower support frame 1 are separated, and the lower bite plate 12 and the upper bite plate 22 rely on the expansion torsion spring 3 to expand the patient's mouth.

[0039] After the insertion rod 212 leaves the spinning lock core 113, the lock tongue 114 slides to the initial state inside the spinning lock core 113 under the elastic force of the elastic bandage 116, and the vertical slot 1153 is pulled out and no longer restricts the unlocking linkage rod 2122. The first magnetic block 1131 moves toward the third magnetic block 1121 under the action of magnetic force, and the second magnetic block 1132 moves toward the fourth magnetic block 1122 under the action of magnetic force, so that the spinning lock core 113 can automatically rotate to the initial state in the reset bracket 112.

[0040] During the process of the lower bite plate 12 and the upper bite plate 22 expanding the patient's oral cavity, the medical staff can check and operate the patient's oral cavity. The oral expansion process does not require the medical staff to operate, which significantly reduces the difficulty of operation for the medical staff. Moreover, this expansion method is elastic expansion, and the degree of expansion of the patient's oral cavity can be determined by the patient himself, which improves the comfort of the patient's oral expansion process.

[0041] After the oral expansion is completed, the patient bites again, so that the lower bite piece 12 and the upper bite piece 22 gradually approach each other, and the insertion rod 212 is gradually inserted into the spin lock core 113. At this time, the spin lock core 113 has returned to its initial state, so the end of the unlocking linkage rod 2122 enters the insertion vertical groove 1151, and the lower end of the insertion rod 212 gradually squeezes the lock tongue 114. When the wedge-shaped lock mouth 2121 moves to the lock tongue 114, the end of the unlocking linkage rod 2122 is still located in the insertion vertical groove 1151, the spin lock core 113 does not rotate, and the end of the lock tongue 114 bounces into the wedge-shaped lock mouth 2121. At this time, the insertion rod 212 is locked by the spin lock core 113 again, and the oral expander returns to its initial state, and the patient can take out the oral expander.

[0042] Embodiment 2: This embodiment is based on embodiment 1, and the difference is that the oral expander for oral cavity in this embodiment has the function of limiting the expansion range, such as Fig.11 As shown, in order to prevent the oral expander from expanding too large an angle inside the patient's mouth and to prevent the oral expander from causing damage to the patient's mouth, in the present embodiment, a limit block 41 is fixedly provided on the circumferential outer wall at the end of the fixed shaft 4, and a stop block 51 is fixedly provided on the circumferential outer wall of the rotating shaft 5. The limit block 41 cooperates with the stop block 51, and the limit block 41 is located on the movement path of the stop block 51. After the upper support frame 2 and the lower support frame 1 are opened, when the stop block 51 contacts the limit block 41, the rotating shaft 5 will not be able to continue to rotate, thereby preventing the upper support frame 2 and the lower support frame 1 from expanding too large an angle, thereby preventing the oral expander from expanding too large an angle inside the patient's mouth and to prevent the oral expander from causing damage to the patient's mouth.

[0043] The utility model and its implementation modes are described above, and such description is not restrictive. What is shown in the drawings is only part of the implementation modes of the utility model, and the actual structure is not limited thereto.

Claims

1. An oral expander for stomatology, comprising a lower support frame (1) and an upper support frame (2), wherein the upper support frame (2) is rotatably mounted on the lower support frame (1), and characterized in that: The lower support frame (1) is provided with a fixed shaft (4), and the side walls at both ends of the upper support frame (2) facing each other are respectively fixed with rotating shafts (5), and the ends of the two rotating shafts (5) are respectively rotatably connected to the two ends of the fixed shaft (4), and the outer movable sleeve of the rotating shaft (5) is provided with an expansion torsion spring (3), and the two ends of the expansion torsion spring (3) are respectively connected to the end side wall of the upper support frame (2) and the end of the fixed shaft (4), and the upper wall of the lower support frame (1) is provided with a lock core component (11), and the inner wall of the upper support frame (2) is provided with a key component (21), and the lock core component (11) is located on the movement path of the key component (21), and the lock core component (11) comprises a lower support (111), a reset bracket (112) and a self-spinning lock core (113), and the lower support (111) is fixedly arranged on the upper wall of the lower support frame (1), and the reset bracket (112) is rotatably arranged on the inner wall of the lower support (111), and the self-spinning lock core (113) is rotatably arranged on the reset bracket (112). The spin lock core (113) is a hollow cylindrical structure, a lock tongue (114) is slidably penetrated through the side wall of the spin lock core (113), an unlocking groove (115) is engraved on the inner circumferential wall of the spin lock core (113), and the key member (21) comprises an upper support (211) and an insertion rod (212), the upper support (211) is fixedly arranged on the inner side wall of the upper support frame (2), and the insertion rod (212) is hingedly arranged on the upper support frame (2). The inner side wall of the support (211) is provided with a lower end of the insertion rod (212) facing the spin lock core (113), and the side wall of the insertion rod (212) is provided with a wedge-shaped lock opening (2121). The side wall of the insertion rod (212) is slidably provided with an unlocking linkage rod (2122). After the insertion rod (212) is inserted into the spin lock core (113), the end of the unlocking linkage rod (2122) is movably inserted into the unlocking groove (115), and the wedge-shaped lock opening (2121) corresponds to the lock tongue (114).

2. The oral cavity expander for stomatology according to claim 1, characterized in that: A first magnetic block (1131) and a second magnetic block (1132) are embedded in the outer circumferential side wall of the spin lock core (113), the first magnetic block (1131) and the second magnetic block (1132) are arranged opposite to each other, and the outer walls of the first magnetic block (1131) and the second magnetic block (1132) have opposite magnetic poles; a third magnetic block (1121) and a fourth magnetic block (1122) are embedded in the inner circumferential wall of the reset bracket (112), the third magnetic block (1121) and the fourth magnetic block (1122) are arranged opposite to each other, and the magnetic poles of the side walls facing each other of the third magnetic block (1121) and the fourth magnetic block (1122) are opposite to each other; when the first magnetic block (1131) is close to the third magnetic block (1121), the magnetic poles of the side walls facing each other of the first magnetic block (1131) and the third magnetic block (1121) are opposite to each other.

3. The oral cavity expander for stomatology according to claim 2, characterized in that: The unlocking groove (115) is formed by connecting an insertion vertical groove (1151), an inclined groove (1152) and a withdrawal vertical groove (1153) in sequence. The upper ends of the insertion vertical groove (1151) and the withdrawal vertical groove (1153) both penetrate the upper wall of the spin lock cylinder (113). The two ends of the inclined groove (1152) are respectively connected to the lower ends of the insertion vertical groove (1151) and the withdrawal vertical groove (1153). The engraving depth of the inclined groove (1152) gradually decreases from the insertion vertical groove (1151) to the withdrawal vertical groove (1153). An anti-rotation blocking surface (1154) is provided on one side of the withdrawal vertical groove (1153) close to the end of the inclined groove (1152).

4. The oral cavity expander for stomatology according to claim 1, characterized in that: The upper wall of one end of the lock tongue (114) close to the inside of the spin lock core (113) is a wedge-shaped surface (1141), and the outer circumferential side wall of the spin lock core (113) is provided with an elastic bandage (116), the two ends of the elastic bandage (116) are respectively located on both sides of the lock tongue (114), and the middle part of the elastic bandage (116) is in contact with the end of the lock tongue (114).

5. The oral cavity expander for stomatology according to claim 1, characterized in that: A first elastic sheet (2123) is fixedly provided inside the insertion rod (212), and a side wall of the first elastic sheet (2123) is in elastic contact with an end portion of the unlocking linkage rod (2122) close to the inside of the insertion rod (212).

6. The oral cavity expander for stomatology according to claim 1, characterized in that: A second elastic sheet (1111) is connected between the upper wall of the lower support (111) and the lower wall of the reset bracket (112), and a third elastic sheet (2111) is fixedly provided on the lower wall of the upper support (211), and the third elastic sheet (2111) is in elastic contact with the side wall of the insertion rod (212).

7. The oral cavity expander for stomatology according to claim 1, characterized in that: A lower engaging plate (12) is fixedly provided on the lower wall of the lower support frame (1), and an upper engaging plate (22) is fixedly provided on the upper wall of the upper support frame (2).

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