Improved combined herbst mandibular advancement appliance

Abstract

The application provides an improved combined Herbst lower jaw forward guiding appliance, wherein an upper axle seat is integrally formed with an upper connecting crown, an adjusting mechanism for a push rod to pass through is fast-detachable connected to the upper axle seat, the adjusting mechanism is composed of a hollow adjusting knob, a hollow stud and a fast-detachable lock buckle, two front and rear support rod connecting parts are arranged on the upper connecting crown or the lower connecting crown close to the lingual side, the support rod connecting parts are integrally formed with the upper connecting crown or the lower connecting crown, and the support rod connecting parts are provided with insertion grooves for fast-detachable connection with support rods of an arch expander. The upper axle seat is integrally formed with the upper connecting crown, and the adjusting mechanism is connected with the upper axle seat through the fast-detachable lock buckle, so that the clinical operation is more convenient, the time of a doctor at a chair is greatly saved, and the problem of low strength of a traditional Herbst appliance axle seat and easy welding fracture is solved. In addition, the support rod connecting parts are integrally formed on the lingual side of the connecting crown and can be fast-detachably connected with components such as the arch expander and TPA, so that the number of clinical rework times caused thereby is reduced, and the economic burden of a patient caused by re-production of the appliance is reduced.

Description

Technical Field

[0001] This invention relates to orthodontics, specifically to a modified combined Herbst mandibular pre-leader appliance. Background Technology

[0002] The Herbst appliance is a fixed bite-shifting device used to treat Class II malocclusion. Its principle is to use the mechanical force of the appliance itself to force the mandible forward, placing it in a protruding position relative to the maxilla, thus correcting the malocclusion. Currently, the Herbst appliance has the following limitations:

[0003] 1) The Herbst appliance's inserts and hollow sleeves need to be fixed to the upper and lower cast crowns via screws using mounting brackets welded to them. The force transmitted from the mandibular portion to the maxillary crown mounting brackets through the inserts and sleeves is relatively large, and current laser and silver soldering methods often fail to meet practical requirements, leading to frequent occurrences of mounting bracket detachment and breakage in clinical practice. There is also the issue of the mounting bracket screws for the maxillary posterior teeth; due to the posterior position of the mounting brackets, the screw teeth are often too small. In the limited intraoral opening environment, direct intraoral manipulation is difficult, and there is also the risk of patients accidentally swallowing screws.

[0004] 2) Orthodontic treatment often involves targeted treatment plans implemented at different stages based on clinical needs, resulting in different appliance components required at each stage. For example, an expander is used during the expansion stage, and a TPA (tissue pressure aspirator) is used during the maintenance stage. Sometimes, multiple functional components need to be used in combination even within the same stage. Currently, once an appliance is fabricated, its components are singular at different stages of treatment and cannot be replaced or modified midway, leading to difficulties in clinical operation and a poor patient experience. Furthermore, the need to fabricate multiple appliances for the same patient increases the unproductive workload for doctors and technicians, while also increasing the financial burden on patients.

[0005] 3) Existing Herbst appliances are manufactured by the technical department after the clinician determines the mandibular position by biting on wax. Because patients' anterior teeth often have crowding and rotation, it is difficult for the clinician to predict the midline position of the upper and lower anterior teeth during wax biting. Therefore, after the mandibular guidance treatment with this appliance is completed, midline deviation often occurs, requiring secondary adjustments to the midline. Adjusting the midline during orthodontic treatment is a difficult and time-consuming step. Furthermore, for some patients with deep overbite, the mandibular guidance cannot be achieved in one session and needs to be performed in stages. Existing traditional Herbst appliances make it difficult to adjust the mandibular position during treatment. Even some modified adjustable Herbst appliances lack protection for the adjustment threads within the intraoral environment, leading to difficulties in intraoral adjustment or even loss of adjustment function.

[0006] The applicant's patent (CN217390918 U) discloses an adjustable Herbst mandibular preorthodontic appliance, which uses an adjustable hollow knob on the push rod for fine-tuning. However, in actual use, we have found the following problems: (1) The adjusting push rod and sleeve are fixed to the crown bearing with screws, and the bearing may break due to insufficient strength caused by welding; (2) The adjusting external thread of the adjusting push rod is exposed to the oral cavity environment, so food debris can easily accumulate at the adjusting external thread, making it difficult to rotate the hollow adjusting knob.

[0007] In summary, we hope to provide some new Herbst mandibular prefrontal appliance to solve the above problems, thereby improving the durability and ease of operation of the Herbst mandibular prefrontal appliance. Summary of the Invention

[0008] This invention provides a modified combined Herbst mandibular pre-orthodontic appliance, comprising an upper crown and a lower crown respectively fixed to the upper and lower rows of teeth. Upper and lower bearings are located on the left and right sides of the upper and lower crowns, respectively, with a push rod rotatably connected to the lower bearing.

[0009] The upper shaft seat is a T-shaped connecting post and is integrally formed with the upper crown. The upper shaft seat is quickly connected to an adjustment mechanism through which the push rod passes. The adjustment mechanism consists of a hollow adjustment knob, a hollow stud, and a quick-release latch.

[0010] The hollow stud has internal threads on its inner wall, and an opening at one end for threaded connection with a hollow adjustment knob. A quick-release latch is installed at the other end of the hollow stud.

[0011] The quick-release latch includes an open ring and a locking plate. The open ring is fixedly connected to the hollow stud. The locking plate is equipped with a reset device and slides or rotates relative to the open ring to open or close the opening of the open ring.

[0012] When the reset device is not subjected to force, the locking plate and the open ring cooperate to form a closed hole and rotate with the upper shaft seat;

[0013] The upper or lower crown has two support rod connecting parts near the tongue side. The support rod connecting parts are integrally formed with the upper or lower crown. The support rod connecting parts are provided with slots for quick-release connection with the support rod of the bow expander.

[0014] Furthermore, the hollow adjustment knob has an externally threaded post at the front end and a smooth post at the rear end. Multiple pin holes are provided at equal angles along the circumference on the smooth post. Inserting a pin into the pin hole will cause the hollow adjustment knob to rotate.

[0015] The hollow stud has an angle scale line on the outer diameter of the end near the hollow adjustment knob.

[0016] Furthermore, the axial adjustment length of the hollow adjustment knob relative to the hollow stud is 0-7mm.

[0017] Furthermore, the reset device is a spring;

[0018] The quick-release latch also includes a connecting rod, the locking plate is fixed to one end of the connecting rod, the connecting rod is slidably engaged with the hollow stud, and the spring abuts between the connecting rod and the hollow stud.

[0019] Furthermore, the hollow stud has two first stops parallel to its outer diameter, and both first stops have coaxial sliding holes through which the connecting rod slides.

[0020] The outer diameter of the connecting rod is fitted with a second stop block located between two first stops. The spring is sleeved on the connecting rod and located between the second stop block and the first stop block near the locking plate.

[0021] Furthermore, the upper connecting crown and the lower connecting crown are made of metal;

[0022] The other end of the hollow stud is closed, and the hollow stud and the open ring are integrally formed;

[0023] The connecting rod and the locking plate are integrally formed.

[0024] Furthermore, a lever is installed on the outer diameter of the end of the connecting rod away from the locking plate, and the lever and the second stop are welded to or threaded to the connecting rod;

[0025] The edges of the first stop, the second stop, and the toggle block are all rounded chamfers.

[0026] Furthermore, the reset device is a torsion spring.

[0027] The locking plate is rotatably connected to the open ring and is equipped with a torsion spring.

[0028] Furthermore, the support rod connection is provided with a transverse slot and a longitudinal slot, and the opening of the transverse slot faces the tongue side;

[0029] The front end of the support rod is provided with a plug for inserting into the horizontal slot, and the plug is provided with a vertical insertion hole. After the plug is inserted into the horizontal slot, the vertical insertion hole and the vertical slot coincide. The locking pin is inserted into the vertical slot and the vertical insertion hole to fix the support rod to the support rod connection part.

[0030] Furthermore, the sides of the support rod connection, the insert block, and the locking pin are respectively provided with a first locking pin hole, a second locking pin hole, and a third locking pin hole that overlap each other. The first locking pin hole, the second locking pin hole, and the third locking pin hole are used to insert the anti-rotation pin.

[0031] Because this invention employs the above-described technical solution, compared to the current Herbst orthodontic appliance, the advantages of this invention are as follows:

[0032] (1) The present invention integrates the upper shaft seat and the upper crown into one piece, and the adjustment mechanism is connected to the upper shaft seat through a quick-release buckle. This solves the problem that the traditional Herbst appliance connects the crown and the shaft seat in the maxillary posterior tooth area by welding technology, which has low strength and is prone to detachment and breakage. At the same time, it greatly facilitates the steps of adding the sleeve and screw after intraoral expansion in clinical practice.

[0033] (2) At the same time, based on clinical needs, an adjustable and retractable Herbst cannula was designed, which meets the clinical requirement that the Herbst appliance can be finely adjusted intraorally in terms of mandibular step-by-step pre-leading or left and right pre-leading amounts. The pre-leading is completed by rotating the internal thread of the hollow stud, which avoids the problem of some adjustment device tracks being directly exposed in the oral environment, causing adjustment difficulties and adjustment device failure due to factors such as food debris.

[0034] (3) The present invention also takes into account the clinical need for width adjustment of the mandibular prefrontal cortex to coordinate the upper and lower dental arches. The palatal assembly cannot be replaced according to the clinical stage. A specific assembly structure is designed, with a support rod connection part integrally formed on the lingual side of the crown. The support rod of the expander is structurally improved to match, realizing the detachable connection between the expander support rod and the crown. Through a specific device, the expander, TPA and other functional components are combined at different clinical treatment stages, reducing the number of clinical reworks and reducing the economic burden on patients caused by the remaking of orthodontic appliances. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the modified combined Herbst mandibular pre-oral appliance provided by the present invention installed in the mouth;

[0037] Figure 2 This is a schematic diagram of the quick-release latch of the present invention in the closed state;

[0038] Figure 3This is a schematic diagram of the quick-release latch in the open state in Example 1;

[0039] Figure 4 This is a schematic diagram of the hollow stud in Example 1;

[0040] Figure 5 This is a schematic diagram of the integrally formed hollow stud and open ring in Example 1;

[0041] Figure 6 This is a schematic diagram of the connecting rod with a locking plate in Embodiment 1;

[0042] Figure 7 This is a schematic diagram of an expander connected to the tongue side of the upper crown in Example 1;

[0043] Figure 8 This is a schematic diagram of the structure of one of the connecting parts of the rod integrally formed with the upper crown in Embodiment 1;

[0044] Figure 9 This is a schematic diagram of the front end structure of the bow expander support rod in Example 1;

[0045] Figure 10 This is a schematic diagram of the pin structure used to lock the bow expander support rod to the support rod connection part in Embodiment 1. Detailed Implementation

[0046] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0047] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0048] Example 1

[0049] Reference Figure 1As shown, this invention provides a modified combined Herbst mandibular pre-orthodontic appliance. The Herbst mandibular pre-orthodontic appliance includes an upper crown 1 and a lower crown 2, which are respectively fixed to the upper and lower rows of teeth. Upper crown 1 and lower crown 2 have upper bearing seats 3 and lower bearing seats 4 on their left and right sides, respectively. The lower bearing seat 4 has a pre-drilled threaded hole, and one end of a push rod 5 is rotatably mounted thereon using a screw. The upper bearing seat 3 is a T-shaped nut integrally formed with the upper bearing seat 3, and the adjustment mechanism 6 is rotatably mounted using the T-shaped nut. To ensure strength, the upper crown 1 and lower crown 2 are made of integrally formed metal, and the upper bearing seat 3 is also integrally formed with the upper crown 1.

[0050] The lower shaft seat 4 is rotatably connected to a push rod 5, and the upper shaft seat 3 is quickly connected to an adjustment mechanism 6 through which the push rod 5 passes. The adjustment mechanism 6 consists of a hollow adjustment knob 10, a hollow stud 20, and a quick-release latch 30.

[0051] The hollow stud 20 has an internal thread, and one end of the hollow stud 20 has an opening for connecting with the external thread of the hollow adjustment knob 10. The other end of the hollow stud 20 is a closed surface without an opening, and the quick-release latch 30 is installed on the other end of the hollow stud 20.

[0052] In this embodiment, the quick-release latch 30 is a spring latch composed of an open ring 31, a connecting rod 34, a locking plate 32, and a spring. The open ring 31 is fixedly connected to the hollow stud 20, and the opening of the open ring 31 faces the rear and upper part of the hollow stud 20. Figure 1 As shown, during the correction process, the adjusting mechanism 6 is tilted upwards, so the open ring 31 is positioned above and behind the hollow stud 20, which can better withstand the force from the upper shaft seat 3, thus improving stability and durability. The locking plate 32 is fixed to one end of the connecting rod 34, which slides with the hollow stud 20 and is equipped with a spring.

[0053] Two first stops 21 are provided parallel to the outer diameter of the hollow stud 20. The connecting rod 34 slides through the two first stops 21 simultaneously, and the first stops 21 guide the axial sliding of the connecting rod 34. A second stop 35 is fixed on one side of the outer diameter of the connecting rod 34, located between the two first stops 21. A spring is sleeved on the connecting rod 34 and located between the second stop 35 and the first stop 21 near the locking piece 32.

[0054] When the spring is not under force, it applies an axial thrust away from the open ring 31 to the second stop 35 and the connecting rod 34, so that the locking plate 32 and the open ring 31 cooperate to form a closed hole through which the upper shaft seat 3 passes.

[0055] The hollow adjustment knob 10 has a threaded post 11 at the front end and a smooth post 12 at the rear end. Multiple pin holes 13 are provided at equal angles along the circumference of the smooth post 12. Inserting a pin into the pin hole rotates the hollow adjustment knob 10, adjusting the length of the push rod 5 extending into the hollow stud 20. Preferably, the axial adjustment length of the hollow adjustment knob 10 is 0-7mm. An angle scale line 22 is provided on the outer diameter of the end of the hollow stud 20 near the hollow adjustment knob 10. The rotation angle of the hollow adjustment knob 10 can be visually observed through the angle scale line 23, thus revealing the axial length after adjustment. For example, a pin hole 13 is provided every 45 degrees on the smooth post 12. Inserting a pin into the pin hole 13 and rotating the hollow adjustment knob 10 to 90 degrees with reference to the angle scale line 22 moves the hollow adjustment knob 10 forward or backward by 1mm, thus helping the operator precisely control the adjustment length.

[0056] like Figure 6 As shown, a lever 28 is provided on the outer diameter of the end of the connecting rod 34 away from the locking plate 32, which facilitates the operator to slide the connecting rod to open the opening ring 31. To improve the comfort of wearing inside the mouth, the edges of the first stop 21, the second stop 35, and the lever 28 are all rounded chamfered.

[0057] The installation method for the lever 28 and the second stop 35 can be as follows: First, pass the connecting rod 34 of the smooth rod through the sliding hole 22 of the first stop 21. After passing through the first stop 21 on the right side of the figure, place the spring on the connecting rod 34, and then pass the connecting rod 34 through the first stop 21 on the left side. Then, fix the lever 28 and the second stop 35 to the connecting rod 34 by welding or threading.

[0058] To ensure strength, the hollow stud 20 and the open ring 31 are made of one-piece molded metal, and the connecting rod 34 and the locking plate 32 are also made of one-piece molded metal.

[0059] In some correction scenarios, the lower crown is often used in conjunction with a bow expander 54. Current bow expanders are typically fixed to the lower crown and cannot be replaced mid-treatment. To address this issue, this invention improves the connection method between the crown and the bow expander, enabling a quick-release connection between the expander's support rod and the upper and lower crowns. (Refer to...) Figures 7-10 As shown, the specific scheme for connecting the upper and lower crowns with the bow expander 54 is as follows:

[0060] like Figure 7-8 As shown, taking the upper crown 1 as an example, the structural changes of the upper crown 1 are as follows: the upper crown 1 has two support rod connecting parts 40 on both sides near the tongue side for connecting the bow expander support rod. The side of the support rod connecting part 40 facing the tongue side has a horizontal slot 41, and the lower surface of the support rod connecting part 40 has a vertical slot 42.

[0061] like Figure 9-10 As shown, the front end of the support rod 50 is provided with a flat insert 51 for insertion into the transverse slot 41, and the insert 51 is provided with a longitudinal insertion hole 52. The locking pin 44 is inserted into the longitudinal slot 42 and the longitudinal insertion hole 52 to fix the support rod 50 and the support rod connecting part 40.

[0062] The connection between the support rod 50 and the connecting crown is as follows: the insert block 51 at the front end of the support rod 50 is inserted horizontally into the horizontal slot 41. After full insertion, the vertical insertion hole 52 and the vertical slot 42 coincide. Then, the locking pin 44 is inserted vertically into the vertical slot 42 and the vertical insertion hole 52 to prevent the support rod 50 from coming out.

[0063] The locking pin 44 is shaped like a T-nut, and a transverse through hole 46 is provided at the top of the locking pin 44 to facilitate the insertion of the traction hook into the through hole 46 and the removal of the locking pin 44.

[0064] To prevent the support rod 50 from rotating, a first locking pin hole 43, a second locking pin hole 53, and a third locking pin hole 45 are respectively provided in the support rod connecting part 40, the insert block 51, and the locking pin 44. After inserting the locking pin 44, an anti-rotation pin is inserted laterally to prevent the support rod 50 from rotating. Preferably, the locking pin 44, the longitudinal slot 42, and the longitudinal insertion hole 52 are non-circular irregular holes, so that after the locking pin 44 is inserted, the first locking pin hole 43, the second locking pin hole 53, and the third locking pin hole 45 coincide, which facilitates the insertion of the anti-rotation pin.

[0065] Alternatively, the shape of the horizontal slot 41 and the insert 51 can be set to a rectangle or similar shape. After the insert 51 is inserted into place and the locking pin 44 is installed, the insert 51 is firmly fixed and cannot be rotated.

[0066] The clinical implementation steps of this embodiment are as follows:

[0067] (1) When wearing it for the first time in clinical practice, the upper and lower 3D printed metal crowns are bonded to the upper and lower posterior teeth respectively.

[0068] (2) Insert the insert block 51 at the front end of the support rod 50 of the spiral bow expander 54 horizontally into the horizontal slot 41. After full insertion, the longitudinal insertion hole 52 and the longitudinal slot 42 should coincide. Then, insert the locking pin 44 vertically into the longitudinal slot 42 and the longitudinal insertion hole 52 to prevent the support rod 50 from coming out. To prevent the support rod 50 from rotating, the anti-rotation pin can be inserted horizontally into the first locking pin hole 43, the second locking pin hole 53, and the third locking pin hole 45. After the four support rods 50 of the spiral bow expander 54 are installed, adjust the spiral bow expander 54 to perform bow expansion.

[0069] (3) After the maxillary arch expansion is completed, the maxillary arch expander can be removed and replaced with a TPA device that maintains the width of the maxillary arch.

[0070] (4) After assembling the adjustment mechanism 6, slide the connecting rod 34 towards the opening ring 31 to open the opening ring 31. Move the hollow stud 20 to place the upper shaft seat 3 inside the opening ring 31. Then release the connecting rod 34. Under the action of the spring, the connecting rod 34 slides in the opposite direction to drive the locking piece 32 to reset, and hang the quick-release buckle 3 on the upper shaft seat 3. Since the upper shaft seat 3 is a T-shaped connecting post, the quick-release buckle 3 can rotate and will not fall off. Then install one end of the push rod 5 at the lower shaft seat of the lower crown 2 with a screw. Finally, insert the push rod 5 into the hollow adjustment mechanism 6 to form the Herbst mandibular preorthodontic appliance.

[0071] In the initial stage, the length of the adjustment mechanism 6 is not increased by rotating the hollow adjustment knob 10; that is, the external threaded post 11 of the hollow adjustment knob 10 is fully screwed into the hollow stud 20, and the adjustment mechanism 6 is in its shortest state at this time. Later, according to the patient's correction, the hollow adjustment knob 10 is rotated to make step-by-step leading and left-right fine adjustments.

[0072] Example 2

[0073] Unlike Embodiment 1, the locking plate 32 in this embodiment uses a rotating method to cooperate with the open ring 31, so the connecting rod 34 can be directly eliminated, and the structure is similar to the current rotating hook, thus simplifying the structure.

[0074] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A modified combined Herbst mandibular pre-orthodontic appliance, comprising an upper crown (1) and a lower crown (2) respectively fixed to the upper and lower rows of teeth, wherein an upper bearing (3) and a lower bearing (4) are provided on the left and right sides of the upper crown (1) and the lower crown (2), and a push rod (5) is connected to the lower bearing (4), characterized in that, The upper shaft seat (3) is a T-shaped nut and is integrally formed with the upper connecting crown (1). The upper shaft seat (3) is quickly connected to an adjustment mechanism (6) through which the push rod (5) passes. The adjustment mechanism (6) consists of a hollow adjustment knob (10), a hollow stud (20) and a quick-release buckle (30). The adjustment mechanism is installed by rotating the T-shaped nut. The hollow stud (20) has an internal thread on its inner wall. One end of the hollow stud (20) has an opening for threaded connection with the hollow adjustment knob (10). The other end of the hollow stud (20) is equipped with a quick-release latch (30). The quick-release latch (30) includes an open ring (31) and a locking plate (32). The open ring (31) is fixedly connected to the hollow stud (20). The locking plate (32) is equipped with a reset device (33) and slides or rotates relative to the open ring (31) to open or close the open ring (31). When the reset device (33) is not under force, the locking plate (32) and the open ring (31) cooperate to form a closed hole and rotate to connect with the upper shaft seat (3). The upper crown (1) or the lower crown (2) is provided with two support rod connecting parts (40) near the tongue side. The support rod connecting parts (40) are integrally formed with the upper crown (1) or the lower crown (2). The support rod connecting parts (40) are provided with slots for quick connection with the support rod (50) of the bow expander (54). The reset device (33) is a spring; the quick-release buckle also includes a connecting rod (34), the locking piece (32) is fixed to one end of the connecting rod (34), the connecting rod (34) is slidably engaged with the hollow stud (20) and the spring abuts between the connecting rod (34) and the hollow stud (20); The hollow stud (20) has two first stops (21) parallel to its outer diameter. Both first stops (21) have coaxial sliding holes (22) through which the connecting rod (34) slides. The connecting rod (34) has a second stop (35) installed on its outer diameter between the two first stops (21). The spring is sleeved on the connecting rod (34) and located between the second stop (35) and the first stop (21) near the locking piece (32). The hollow adjustment knob (10) has an external threaded column (11) at the front end and a smooth column (12) at the rear end. Multiple pin holes (13) are provided at equal angles along the circumferential direction on the smooth column (12). The pin is inserted into the pin hole (13) and drives the hollow adjustment knob (10) to rotate. The hollow stud (20) has an angle scale line (23) on the outer diameter of one end near the hollow adjustment knob (10).

2. The improved combined Herbst mandibular prefrontal appliance as described in claim 1, characterized in that, The axial adjustment length of the hollow adjustment knob (10) relative to the hollow stud (20) is 0-7mm.

3. The improved combined Herbst mandibular prefrontal appliance as described in claim 2, characterized in that, The upper connecting crown (1) and the lower connecting crown (2) are integrally formed metals; The other end of the hollow stud (20) is closed, and the hollow stud (20) and the open ring (31) are integrally formed; The connecting rod (34) and the locking plate (32) are integrally formed.

4. The improved combined Herbst mandibular prefrontal appliance as described in claim 1, characterized in that, A lever (36) is installed on the outer diameter of the end of the connecting rod (34) away from the locking piece (32). The lever (36) and the second stop (35) are welded or threaded to the connecting rod (34). The edges of the first stop (21), the second stop (35), and the toggle block (36) are all rounded chamfers.

5. The modified combined Herbst mandibular prefrontal appliance as described in claim 1, characterized in that, The support rod connection (40) is provided with a transverse slot (41) and a longitudinal slot (42), and the opening of the transverse slot (41) faces the tongue side; The front end of the support rod (50) is provided with a plug (51) for inserting into the horizontal slot (41), and the plug (51) is provided with a vertical insertion hole (52). After the plug (51) is inserted into the horizontal slot (41), the vertical insertion hole (52) and the vertical slot (42) coincide. The locking pin (44) is inserted into the vertical slot (42) and the vertical insertion hole (52) to fix the support rod (50) and the support rod connecting part (40) in place.

6. The modified combined Herbst mandibular premaxillary appliance as described in claim 5, characterized in that, The support rod connecting part (40), the insert (51) and the locking pin (44) are respectively provided with a first locking pin hole (43), a second locking pin hole (53) and a third locking pin hole (45) that overlap each other. The first locking pin hole (43), the second locking pin hole (53) and the third locking pin hole (45) are used to insert the anti-rotation pin.

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