Pocket-size elastic guide rail type oral cavity expander capable of being instantly released by single hand

Abstract

The invention discloses a pocket-size elastic guide rail type oral cavity expander capable of being instantly released by one hand, and relates to the technical field of medical instruments, the pocket-size elastic guide rail type oral cavity expander comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with two hollow stand columns, and the upper ends and the lower ends of the two hollow stand columns are fixedly connected through two arc-shaped guide rails respectively; two arc-shaped guide rails are arranged on the bottom plate, each arc-shaped guide rail is provided with two expanding and supporting rods, two gear assemblies are symmetrically installed at the positions, corresponding to the two hollow stand columns, of the upper surface of the bottom plate, two pressing rod assemblies are arranged at the positions, corresponding to the two gear assemblies, in front of the bottom plate, and stable supporting is achieved by driving the four expanding and supporting rods to expand outwards step by step; in the expanding and supporting stage, the cavity layer of the double-layer silica gel pad in the oral cavity can be synchronously filled with oil and pressurized, the tight fit degree between the double-layer silica gel pad and the tooth surface is enhanced, double limiting and resetting are achieved, the expanding and supporting rod can be unlocked only by shifting the lug block with one hand, hydraulic oil is synchronously recycled, and instant releasing and unlocking with one hand are achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a pocket-sized, flexible guide rail-type oral expander that can be instantly released with one hand. Background Technology

[0002] In clinical procedures such as dentistry, oral and maxillofacial surgery, otolaryngology, and anesthesia, patients often need to maintain an open mouth for a long time. However, due to the physiological limitations of the human temporomandibular joint and masticatory muscles, patients find it difficult to maintain a stable open mouth posture for a long time, especially in children, the elderly, patients with impaired consciousness, or postoperative patients. An oral retractor (also known as an oral opening device or oral diffuser) is a medical device used to maintain the patient's mouth open during oral diagnosis, surgery, or examination. Its main purpose is to provide doctors with a stable and clear operating field and sufficient operating space, while reducing muscle fatigue and discomfort caused by prolonged mouth opening for patients. Currently, most existing oral expanders rely on separate mechanical clips or screws for locking. Some electric oral expanders use motor drive and locking. During operation, only the external expansion mechanism of the expander rod is fixed. However, the silicone pads, support brackets, and other components that come into contact with the teeth inside the mouth are passively supported by the expansion force pressing against the tooth surface. They do not form an active locking structure with the teeth and gums. During the diagnosis and treatment, patients may unconsciously contract their muscles due to discomfort, or experience stress-induced micro-movements of the head due to the contact of the diagnostic instruments. When the doctor operates, slight collisions between the instruments and the expander may also be transmitted to the support end, causing the support to slide, the silicone pad to warp from the edge of the tooth surface, or even detach entirely.

[0003] To address the aforementioned issues, there is an urgent need for innovative designs based on existing oral retractors. Summary of the Invention

[0004] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a pocket-sized, flexible guide rail-type oral expander that can be instantly released with one hand, thereby solving the problem mentioned in the background that existing oral expanders cannot lock onto the internal alveolar bone and may slip and fall off during treatment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pocket-sized, elastic guide rail type oral expander that can be released instantly with one hand, comprising a base plate, two hollow columns fixedly connected to the upper surface of the base plate, the upper and lower ends of the two hollow columns being fixedly connected by two arc-shaped guide rails respectively, two expansion rods being provided on each arc-shaped guide rail, two sets of gear assemblies being symmetrically installed on the upper surface of the base plate corresponding to the positions of the two hollow columns, and two sets of pressing rod assemblies being provided on the front of the base plate corresponding to the positions of the two sets of gear assemblies.

[0006] Preferably, each of the arc-shaped guide rails has two sliders slidably connected to connect the expansion rods, and there are a total of four sliders, with each of the four sliders corresponding to one of the four expansion rods.

[0007] Preferably, each of the four expansion rods has a sleeve fixedly inserted at the end away from the slider. A crossbar runs through the inside of the sleeve. A double-layer silicone pad is fixedly sleeved at one end of the crossbar, and a first spring is sleeved at the other end of the crossbar. There are four double-layer silicone pads in total, and each double-layer silicone pad has an inwardly concave arc in the middle.

[0008] Preferably, the inner walls of the two hollow columns are rotatably connected to two main shafts, and each main shaft is fixedly fitted with two arc-shaped levers at its upper and lower ends. There are a total of four arc-shaped levers, and the four arc-shaped levers are slidably connected to the four expansion rods one by one. Among them, the two arc-shaped levers at the upper end are tilted upwards, and the two arc-shaped levers at the lower end are tilted downwards.

[0009] Preferably, the gear assembly includes a shaft for connecting the pressing rod assembly, a driving gear is fixedly sleeved on the top of the shaft, a driven gear meshes with one side of the driving gear, and the inner wall of the driven gear is fixedly connected to the main shaft.

[0010] Preferably, the pressing rod assembly includes an outer drive rod fixedly connected to the shaft, and an inner sliding rod slidably connected to the inner wall of the outer drive rod. A spring telescopic rod is fixedly connected to the end of the outer drive rod away from the base plate, and a guide plate is slidably connected to the inner wall of the inner sliding rod. Preferably, the inner sliding rod is slidably connected to an insert rod at one end near the bottom plate, and the guide plate is provided with an inclined groove near the insert rod for the insert rod to slide. The upper surface of the base plate has two arc-shaped limiting grooves corresponding to the positions of the two sets of pressing rod assemblies, and the inner wall of each arc-shaped limiting groove is provided with several protrusions. Preferably, one end of the insertion rod slides along the arc-shaped limiting groove, one end of the guide plate is fixedly connected to the ear block, and the ear block is connected to the inner sliding rod by a second spring.

[0011] Preferably, the spring telescopic rod is divided into a tube body and a piston rod, and a return spring is connected between the tube body and the piston rod. The front end of the piston rod is fixedly connected to one end of the inner sliding rod. The tube body is filled with hydraulic oil. Two hoses are inserted into the outer wall of the tube body. The double-layer silicone pad has a cavity layer inside. One end of the hose passes through the crossbar and is connected to the cavity layer of the double-layer silicone pad.

[0012] Compared with the prior art, the beneficial effects of the present invention are: By converging the four expander rods in the central area in the initial stage, the expansion stage is achieved by two sets of pressing rod assemblies retracting towards the center, and in conjunction with the transmission of two sets of gear assemblies, driving the four arc-shaped levers to rotate and gradually misalign with the arc-shaped guide rail, so as to realize the synchronous outward expansion of the four expander rods. This, in turn, drives the four crossbars and four double-layer silicone pads to move along the tooth surfaces of the patient's upper and lower teeth, thus achieving stable expansion of the oral cavity. When operating on patients with relatively small oral spaces (such as children or patients with swelling in the oral cavity), the four expander rods are concentrated in the central area in the initial state, and the overall volume is small, which makes it easy for doctors to quickly and accurately place the double-layer silicone pads of the expander into the predetermined positions of the patient's upper and lower teeth, avoiding unnecessary stimulation or obstruction of the placement operation caused by the initial volume being too large. In addition, the pressing rod assembly is the core control component for realizing one-handed operation and instant release function. During the retraction process of the pressing rod assembly, the insert rod slides along the arc-shaped limiting groove, and the protrusion prevents the insert rod from sliding in the opposite direction, thereby locking the current expansion position of the expansion rod. The hydraulic oil in the spring telescopic rod is delivered to the cavity layer inside the double-layer silicone pad through the hose. The double-layer silicone pad will expand due to the increase in internal pressure, further conforming to the tooth surface contour and preventing the double-layer silicone pad from sliding off the tooth surface. During the expansion stage, it can not only lock the current expansion position, but also simultaneously inject oil and pressurize the cavity layer of the double-layer silicone pad in the oral cavity, increasing the tightness between the double-layer silicone pad and the tooth surface. The expansion force and the tightness of the silicone pad are adjusted synchronously to achieve dual limiting. In addition, when it is necessary to adjust the expansion angle or release the expansion state, the doctor only needs to press the ear blocks of the two sets of pressing rods with his thumb and forefinger respectively. The ear blocks drive the guide plate to move, and the inclined groove on the guide plate will push the insert rod to slide upward along the axis of the inner sliding rod, realizing instant unlocking. The four arc-shaped levers and four expansion rods are free to reset. At the same time, under the action of the reset spring in the spring telescopic rod, all the hydraulic oil inside the double-layer silicone pad is retracted into the tube. The cavity layer pressure inside the double-layer silicone pad is reduced. The expansion rods retract quickly and instantly reduce the friction between the double-layer silicone pad and the tooth surface, realizing the one-hand instant release function. This allows the expander to be immediately removed in emergency situations (such as when the patient experiences choking, nausea, or other discomfort), improving the safety of operation and reducing the risk caused by instruments remaining in the oral cavity. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of the expansion strut of the present invention retracted at the center position.

[0015] Figure 3 This is a schematic diagram of the structure of the expansion rod of the present invention, which expands to both sides.

[0016] Figure 4 This is a schematic diagram of the gear assembly structure of the present invention.

[0017] Figure 5 This is a schematic diagram of the pressing rod assembly structure of the present invention.

[0018] Figure 6 This is a schematic diagram of the exploded structure of the pressing rod assembly of the present invention.

[0019] Figure 7 This is a cross-sectional view of the external drive rod of the present invention, showing the connection structure between the insert rod and the inclined slot.

[0020] Figure 8 This is a comparison diagram of the insertion rod of the present invention sliding along the inclined groove.

[0021] Figure 9 This is a schematic diagram of the connection structure between the expansion strut and the crossbar of the present invention.

[0022] Figure 10 This is a cross-sectional view of the double-layer silicone pad of the present invention.

[0023] In the diagram: 1. Base plate; 2. Hollow column; 3. Arc-shaped guide rail; 4. Expansion rod; 5. Gear assembly; 501. Shaft; 502. Drive gear; 503. Driven gear; 6. Pressing rod assembly; 601. External drive rod; 602. Internal sliding rod; 603. Spring telescopic rod; 604. Guide plate; 605. Insert rod; 606. Inclined groove; 607. Ear block; 608. Second spring; 609. Flexible hose; 7. Slider; 8. Sleeve; 9. Crossbar; 10. Double-layer silicone pad; 11. First spring; 12. Main shaft; 13. Arc-shaped lever; 14. Protrusion; 15. Cavity layer; 16. Arc-shaped limiting groove. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1 to 10 The present invention provides a technical solution: a pocket-sized elastic guide rail oral expander that can be released instantly with one hand, including a base plate 1. Two hollow columns 2 are fixedly connected to the upper surface of the base plate 1. The upper and lower ends of the two hollow columns 2 are respectively fixedly connected by two arc-shaped guide rails 3. Each arc-shaped guide rail 3 is equipped with two expansion rods 4. Two sets of gear assemblies 5 are symmetrically installed on the upper surface of the base plate 1 corresponding to the positions of the two hollow columns 2. Two sets of pressing rod assemblies 6 are respectively provided on the front of the base plate 1 corresponding to the positions of the two sets of gear assemblies 5.

[0026] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, each arc-shaped guide rail 3 is slidably connected to two sliders 7 for connecting the expansion rods 4. There are a total of four sliders 7, and the four sliders 7 are slidably connected to the four expansion rods 4 in a one-to-one correspondence. The four expansion rods 4 are all fixedly connected to the sleeves 8 at the ends away from the slider 7. A crossbar 9 runs through the inside of the sleeve 8. A double-layer silicone pad 10 is fixedly connected to one end of the crossbar 9, and a first spring 11 is connected to the other end of the crossbar 9. There are four double-layer silicone pads 10 in total, and each double-layer silicone pad 10 has an inwardly concave arc in the middle. It should be noted that the two arc-shaped guide rails 3 are arranged parallel to each other vertically, forming a fixed frame with the two hollow columns 2. This frame is fixedly connected to the base plate 1. During oral cavity expansion, the hollow columns 2 and arc-shaped guide rails 3 serve as the support mechanism for the entire expander, providing a stable foundation for the sliding of the expander rods 4. When the dentist needs to perform expansion, they hold the base plate 1 with one hand, and press the two sets of pressing rod assemblies 6 with their thumb and forefinger respectively, which will cause the four expander rods 4 to slide synchronously to both sides. The sliding connection between the slider 7 and the arc-shaped guide rails 3 ensures the stability of the movement trajectory of the expander rods 4. Among them, one end of each of the four expansion rods 4 is fixedly inserted with a sleeve 8, and a crossbar 9 runs through the inside of the sleeve 8. One end of the crossbar 9 is fixedly fitted with a double-layer silicone pad 10. The double-layer silicone pad 10 is made of medical-grade silicone material. Its soft and elastic properties can effectively avoid hard pressure damage to the patient's oral cavity wall and teeth. The middle of two of the double-layer silicone pads 10 is concave upward, and the other two are concave downward in the opposite direction, which can adapt to the tooth surface contour of the patient's upper and lower teeth. During the expansion process, it can fit the teeth more stably and prevent the expander from shifting in the oral cavity. Furthermore, a first spring 11 is sleeved at the other end of the crossbar 9, allowing the crossbar 9 and the double-layer silicone pad 10 to be dynamically movable. When the double-layer silicone pad 10 contacts the tooth and slides along the tooth surface, since each patient's dental arch shape is different, the first spring 11 can adaptively extend and retract according to the specific shape of the patient's dental arch as the four expansion rods 4 slide to both sides, thereby driving the crossbar 9 and the double-layer silicone pad 10 to make corresponding adjustments. This not only ensures that the double-layer silicone pad 10 always fits tightly against the tooth surface, but also effectively avoids the problem of excessive or insufficient expansion pressure caused by the special shape of the patient's dental arch.

[0027] In this embodiment, as Figure 1 and Figure 4 As shown, the inner walls of the two hollow columns 2 are respectively rotatably connected to two main shafts 12, and the upper and lower ends of each main shaft 12 are respectively fixedly sleeved with two arc-shaped levers 13. There are a total of four arc-shaped levers 13, and the four arc-shaped levers 13 are respectively slidably connected to the four expansion rods 4 one by one. Among them, the two arc-shaped levers 13 at the upper end are inclined upwards, and the two arc-shaped levers 13 at the lower end are inclined downwards; The gear assembly 5 includes a shaft 501 for connecting the pressing rod assembly 6. A drive gear 502 is fixedly sleeved on the top of the shaft 501. A driven gear 503 meshes on one side of the drive gear 502. The inner wall of the driven gear 503 is fixedly connected to the main shaft 12. It should be noted that each of the arc-shaped levers 13 has a sliding groove for the expansion rod 4 to slide. The four arc-shaped levers 13 are symmetrically distributed. The two arc-shaped levers 13 at the upper end are inclined downwards, and the two arc-shaped levers 13 at the lower end are inclined upwards. The inclined design allows the arc-shaped levers 13 to generate an outward pushing force on the expansion rod 4 when rotating with the main shaft 12, thereby realizing the expansion action. Specifically, when the main shaft 12 located on the left rotates clockwise, the arc-shaped lever 13 at the upper left position will also rotate clockwise at the same time. The arc-shaped lever 13 will be misaligned with the arc-shaped guide rail 3 at the upper position. During the misalignment process, one of the expansion rods 4 can be moved to slide from the center position of the arc-shaped guide rail 3 to the left position. At the same time, since the arc-shaped lever 13 is inclined upward, the expansion rod 4 can slide upward through the slider 7 while sliding along the arc-shaped guide rail 3 to the left position. Similarly, the arc-shaped lever 13 at the lower left end will rotate clockwise at the same time. The arc-shaped lever 13 will be misaligned with the arc-shaped guide rail 3 at the lower end. During the misalignment process, one of the expansion rods 4 can slide from the center of the arc-shaped guide rail 3 to the left. At the same time, since the arc-shaped lever 13 is tilted downward, the expansion rod 4 can slide down through the slider 7 while sliding along the arc-shaped guide rail 3 to the left. Similarly, under the action of gear assembly 5, the two sets of gear assemblies 5 drive the two main shafts 12 to rotate respectively. The left main shaft 12 rotates clockwise, and the right main shaft 12 rotates counterclockwise under the action of the right gear assembly 5, respectively pushing the two expansion rods 4 on the right to slide to the right position, so as to realize the synchronous expansion of the four expansion rods 4 to expand outward, thereby driving the four crossbars 9 and the four double-layer silicone pads 10 to move along the tooth surface of the patient's upper and lower teeth, so as to realize the stable expansion of the oral cavity. In addition, in this embodiment, the four expansion rods 4 are made of metal. The metal expansion rods 4 can not only provide the necessary rigid support, but also make appropriate adaptive fine adjustments according to the specific conditions inside the patient's oral cavity. When the pressure in a certain area is too high, the expansion rod 4 in that area can automatically bend to a certain extent. By utilizing the elastic deformation characteristics of the metal material itself, the problem of excessive local pressure that may be caused by rigid connection is effectively avoided. By converging the four expander rods 4 in the central area in the initial stage and gradually expanding to both sides in the expansion stage, when operating on patients with relatively narrow oral spaces (such as children or patients with swelling in the oral cavity), the four expander rods 4 are concentrated in the central area in the initial state, and the overall volume is small. This makes it easy for doctors to quickly and accurately place the double-layer silicone pad 10 of the expander into the predetermined position of the patient's upper and lower teeth, avoiding unnecessary stimulation or obstruction of the placement operation caused by the initial volume being too large.

[0028] In this embodiment, as Figures 5 to 10 As shown, the pressing rod assembly 6 includes an outer drive rod 601 fixedly connected to the shaft 501, and an inner sliding rod 602 slidably connected to the inner wall of the outer drive rod 601. A spring telescopic rod 603 is fixedly connected to one end of the outer drive rod 601 away from the base plate 1, and a guide plate 604 is slidably connected to the inner wall of the inner sliding rod 602. The inner sliding rod 602 is slidably connected to the insertion rod 605 at one end near the bottom plate 1, and the guide plate 604 is provided with a sloping groove 606 near the insertion rod 605 for the insertion rod 605 to slide. Two arc-shaped limiting grooves 16 are respectively opened on the upper surface of the base plate 1 at the positions of the two sets of pressing rod assemblies 6, and the inner wall of each arc-shaped limiting groove 16 is provided with several protrusions 14. One end of the insertion rod 605 slides along the arc-shaped limiting groove 16, and one end of the guide plate 604 is fixedly connected to the ear block 607. The ear block 607 is connected to the inner sliding rod 602 by a second spring 608. The spring telescopic rod 603 is divided into a tube body and a piston rod, and a return spring is connected between the tube body and the piston rod. The front end of the piston rod is fixedly connected to one end of the inner sliding rod 602. The tube body is filled with hydraulic oil. Two hoses 609 are inserted into the outer wall of the tube body. The double-layer silicone pad 10 has a cavity layer 15 inside. One end of the hose 609 passes through the crossbar 9 and is connected to the cavity layer 15 of the double-layer silicone pad 10.

[0029] It should be noted that the pressing rod assembly 6 is the core control component for realizing single-handed operation and instant release function. When the doctor needs to perform expansion operation, the crossbar 9 and the double-layer silicone pad 10 are inserted into the patient's mouth. The left hand controls the position of the base plate 1, and the right hand can start the expansion operation. The right thumb and index finger are placed on the ends of the outer drive rods 601 of the two sets of pressing rod assemblies 6, and the two sets of pressing rod assemblies 6 can be closed inward at the same time. When pressure is applied by the thumb and forefinger, the outer drive rod 601 will rotate around the central axis of the shaft 501. At this time, the shaft 501 rotates synchronously and drives the drive gear 502 in the gear assembly 5 to rotate. The drive gear 502 meshes with the driven gear 503 to drive the main shaft 12 to rotate. The gear assembly 5 on the left drives the main shaft 12 on the left to rotate clockwise, and the gear assembly 5 on the right drives the main shaft 12 on the right to rotate counterclockwise, so that the four expansion rods 4 can slide and expand to both sides. During this process, the insertion rod 605 slides along the arc-shaped limiting groove 16. The protrusion 14 on the inner wall of the arc-shaped limiting groove 16 is triangular, with one side set as an inclined surface and the other side set as a vertical surface. When the insertion rod 605 slides inward along the arc-shaped limiting groove 16, it will slide along the inclined surface of the protrusion 14. When the pressure is stopped, the vertical surface of the protrusion 14 will block the insertion rod 605, preventing the insertion rod 605 from sliding in the opposite direction, thereby locking the current expansion position of the expansion rod 4. Furthermore, for example Figure 7 and Figure 8 As shown, the axial position of the insertion rod 605 is guided by the inclined groove 606, which is opened on the guide plate 604. One end of the guide plate 604 is fixedly connected to the ear block 607. The ear block 607 is connected to the inner sliding rod 602 by the second spring 608. When there is no external force, the position of the guide plate 604 remains unchanged, and the axial position of the insertion rod 605 remains unchanged, always at a fixed height. In the initial state, the insertion rod 605 is located at the low position of the inclined groove 606. At this time, the insertion rod 605 is embedded in the arc-shaped limiting groove 16. At this time, the protrusion 14 on the inner wall of the arc-shaped limiting groove 16 can effectively contact the insertion rod 605 and can play a one-way limiting role for the insertion rod 605. In addition, it should be noted that the radial position of the insertion rod 605 is guided by the arc-shaped limiting groove 16. In this embodiment, the curvature of the arc-shaped limiting groove 16 is set. When the insertion rod 605 slides along the arc-shaped limiting groove 16, the insertion rod 605 can gradually move radially outward with the central axis of the shaft 501 as the center, and gradually compress the spring telescopic rod 603 at the other end. At this time, due to the radial compression of the piston rod of the spring telescopic rod 603 by the inner sliding rod 602, it gradually slides along the tube. During the sliding process, the piston rod compresses the hydraulic oil in the tube and delivers it to the cavity layer 15 inside the double-layer silicone pad 10 through the hose 609. After the cavity layer 15 is filled with hydraulic oil, the double-layer silicone pad 10 will expand due to the increase in internal pressure. Its surface in contact with the patient's teeth will further conform to the tooth surface contour, preventing the double-layer silicone pad 10 from sliding off the tooth surface. Furthermore, the injection of hydraulic oil is gradual. As the rotational swing amplitude of the external drive rod 601 increases, the expansion amplitude of the expansion rod 4 increases, and the compression of the spring telescopic rod 603 also increases. Hydraulic oil is continuously injected into the cavity layer 15, making the expansion degree of the double-layer silicone pad 10 positively correlated with the expansion force. During the expansion stage, the protrusion 14 in the arc-shaped limiting groove 16 can unidirectionally limit the insertion rod 605 and lock the current expansion position. At the same time, oil injection and pressurization operations can be performed on the cavity layer 15 of the double-layer silicone pad 10 in the oral cavity to increase the tightness between the tooth surfaces of the double-layer silicone pad 10. The expansion force and the tightness of the silicone pad are adjusted synchronously to achieve dual limiting. When it is necessary to adjust the expansion angle or release the expansion state, the doctor only needs to press the ear block 607 of the two sets of pressing rod assemblies 6 with his thumb and forefinger respectively. The ear block 607 drives the guide plate 604 to move. The inclined groove 606 on the guide plate 604 will push the insertion rod 605 to slide upward along the axis of the inner sliding rod 602, so that the insertion rod 605 disengages from the protrusion 14 in the arc-shaped limiting groove 16, instantly unlocking it. The position of the inner sliding rod 602 can move and reset freely. The outer drive rod 601 and the inner sliding rod 602 slide and reset synchronously, driving the shaft 501 to rotate in the opposite direction, thereby driving the four arc-shaped levers. 13 and the four expansion rods 4 are reset. At the same time, under the action of the reset spring in the spring telescopic rod 603, all the hydraulic oil inside the double-layer silicone pad 10 is retracted into the tube. The pressure of the cavity layer 15 inside the double-layer silicone pad 10 is reduced, and the silicone pad returns to its initial state. The expansion rods 4 retract quickly and instantly reduce the friction between the double-layer silicone pad 10 and the tooth surface, realizing the one-handed instant release function. This allows the expander to be immediately withdrawn in emergency situations (such as when the patient experiences choking, nausea, or other discomfort), improving the safety of operation and reducing the risk caused by instruments remaining in the oral cavity.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. A pocket-sized, elastic guide rail oral expander that can be released instantly with one hand, comprising a base plate (1), wherein two hollow columns (2) are fixedly connected to the upper surface of the base plate (1), characterized in that: The upper and lower ends of the two hollow columns (2) are fixedly connected by two arc-shaped guide rails (3). Each arc-shaped guide rail (3) is equipped with two expansion rods (4). Two sets of gear assemblies (5) are symmetrically installed on the upper surface of the base plate (1) corresponding to the positions of the two hollow columns (2). Two sets of pressing rod assemblies (6) are provided on the front of the base plate (1) corresponding to the positions of the two sets of gear assemblies (5).

2. The pocket-sized, elastic guide rail oral expander that can be instantly released with one hand according to claim 1, characterized in that: Each of the arc-shaped guide rails (3) has two sliders (7) for connecting the expansion rods (4) respectively. There are a total of four sliders (7), and the four sliders (7) are slidably connected to the four expansion rods (4) one by one.

3. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 2, characterized in that: Each of the four expansion rods (4) has a sleeve (8) fixedly inserted at one end away from the slider (7). A crossbar (9) runs through the inside of the sleeve (8). A double-layer silicone pad (10) is fixedly sleeved at one end of the crossbar (9). A first spring (11) is sleeved at the other end of the crossbar (9). There are four double-layer silicone pads (10), and each double-layer silicone pad (10) has an inwardly concave arc in the middle.

4. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 3, characterized in that: The inner walls of the two hollow columns (2) are respectively rotatably connected to two main shafts (12), and the upper and lower ends of each main shaft (12) are respectively fixedly sleeved with two arc-shaped levers (13). There are four arc-shaped levers (13) in total, and the four arc-shaped levers (13) are respectively slidably connected to the four expansion rods (4). Among them, the two arc-shaped levers (13) at the upper end are inclined upwards, and the two arc-shaped levers (13) at the lower end are inclined downwards.

5. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 4, characterized in that: The gear assembly (5) includes a shaft (501) for connecting to the pressing rod assembly (6). A drive gear (502) is fixedly sleeved on the top of the shaft (501). A driven gear (503) meshes on one side of the drive gear (502). The inner wall of the driven gear (503) is fixedly connected to the main shaft (12).

6. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 5, characterized in that: The pressing rod assembly (6) includes an outer drive rod (601) fixedly connected to the shaft (501) and an inner sliding rod (602) slidably connected to the inner wall of the outer drive rod (601). A spring telescopic rod (603) is fixedly connected to one end of the outer drive rod (601) away from the base plate (1), and a guide plate (604) is slidably connected to the inner wall of the inner sliding rod (602).

7. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 6, characterized in that: The inner sliding rod (602) is slidably connected to the insertion rod (605) at one end near the bottom plate (1), and the guide plate (604) is provided with a sloping groove (606) near the insertion rod (605) for the insertion rod (605) to slide. The upper surface of the base plate (1) has two arc-shaped limiting grooves (16) respectively corresponding to the positions of the two sets of pressing rod assemblies (6), and the inner wall of each arc-shaped limiting groove (16) is provided with several protrusions (14).

8. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 7, characterized in that: One end of the insertion rod (605) slides along the arc-shaped limiting groove (16), and one end of the guide plate (604) is fixedly connected to the ear block (607). The ear block (607) and the inner sliding rod (602) are connected by a second spring (608).

9. A pocket-sized, elastic guide rail oral expander that can be instantly released with one hand, as described in claim 6, characterized in that: The spring telescopic rod (603) is divided into a tube body and a piston rod, and a return spring is connected between the tube body and the piston rod. The front end of the piston rod is fixedly connected to one end of the inner sliding rod (602). The tube body is filled with hydraulic oil. Two hoses (609) are inserted into the outer wall of the tube body. The double-layer silicone pad (10) has a cavity layer (15) inside. One end of the hose (609) passes through the crossbar (9) and is connected to the cavity layer (15) of the double-layer silicone pad (10).

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