CN209916245U

CN209916245U - Adjustable extraoral bow

Info

Publication number: CN209916245U
Application number: CN201920293452.1U
Authority: CN
Inventors: 齐炜峰
Original assignee: Hangzhou Stomatological Hospital Group Co Ltd
Current assignee: Hangzhou Stomatological Hospital Group Co Ltd
Priority date: 2019-03-07
Filing date: 2019-03-07
Publication date: 2020-01-10
Anticipated expiration: 2029-03-07

Abstract

The utility model discloses an adjustable extraoral bow relates to the oral cavity and rescues technical field. The adjustable extraoral arch comprises an arch body, an external arch hanging piece and an adjusting piece, wherein the external arch hanging piece is connected with the arch body through the adjusting piece. The adjusting piece has a locking state and an unlocking state, the outer bow hanging piece and the bow body are relatively fixed in the locking state, and the outer bow hanging piece is movably connected with the bow body in the unlocking state. This adjustable external oral arch reasonable in design, ingenious, simple structure, convenient operation, through setting up the regulating part, when needs are adjusted, directly press the depression bar of regulating part, just can realize that the angle that needs is adjusted to the couple direction of external bow link spare, the medical personnel of being convenient for adjust the angle of external bow link spare as required, and angle modulation is accurate, articulates the convenience during use, and the practicality is strong.

Description

Adjustable extraoral bow

Technical Field

The utility model relates to a technical field is rescued in the oral cavity, particularly, relate to an adjustable extraoral bow.

Background

The oral arch is a device which is connected with the inside and the outside of the oral cavity and transmits the external force of the oral cavity to the inside of the oral cavity, and consists of an inner arch and an outer arch. The inner arch is connected with the correction device in the insertion opening, and the outer arch is connected with the head cap or the neck strap through the iron wire hook to generate correction force.

The extraoral arch has the functions of strengthening anchorage (preventing molar moving proximally), pushing the molar far and middle, depressing the molar, expanding or narrowing the arch and the like, and has the greatest advantages that the extraoral skull supports the extraoral skull to generate acting force on the teeth in the mouth and can not generate acting force on non-acting teeth.

Traditional extraoral arches are all planar, because the angle that different patients need to adjust the dental arch is different, at the in-process of correcting, need adjust the angle of outer arch, all at present through manual wrench wire, form the angle that needs, hang on the headgear. The manual twisting of the iron wire is troublesome to operate, and the accuracy is not very high, so that the correction effect is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an adjustable extraoral bow, it is convenient to adjust, and angle modulation is accurate, is favorable to improving and rescues the effect.

The embodiment of the utility model is realized like this:

based on the above purpose, an embodiment of the present invention provides an adjustable extraoral arch, which includes an arch body, an external arch hanging piece and an adjusting piece, wherein the external arch hanging piece is connected with the arch body through the adjusting piece;

the adjusting piece is provided with a locking state and an unlocking state, the outer bow hanging piece and the bow body are relatively fixed in the locking state, and the outer bow hanging piece is movably connected with the bow body in the unlocking state.

In addition, according to the utility model discloses an adjustable extraoral bow that embodiment provided can also have following additional technical characterstic:

in an optional embodiment of the present invention, the adjusting member includes a ball, a housing and a latch assembly, the ball is fixedly connected to the outer bow hanging member, the housing is fixedly connected to the bow body, the ball is rotatably disposed in the housing, and the latch assembly is disposed in the housing and selectively connected to the ball joint.

In an optional embodiment of the present invention, the locking assembly includes a locking post and a telescopic mechanism abutting against each other, the housing is provided with a through hole, the locking assembly is disposed in the through hole, so that the locking post is located inside the housing relative to the telescopic mechanism, and the ball is provided with a positioning groove;

under the telescopic machanism effect, the card post can bulge the inner wall of casing and with the constant head tank block, with the card post can retract the casing with the constant head tank separation.

In an optional embodiment of the present invention, the number of the positioning grooves is plural, and plural positioning grooves are provided along the rotation direction of the balls at intervals.

In an optional embodiment of the present invention, the ball further includes a fixing portion and a rotating connecting portion, the fixing portion is disposed opposite to the positioning groove, and the outer bow hanging member is fixedly connected to the fixing portion;

the rotation connecting portion is provided with a rotating shaft, and the rotating shaft is rotatably connected with the shell so that the ball rotates around the rotating shaft relative to the shell.

In the utility model discloses an optional embodiment, the casing is hollow spheroid structure, the angle modulation guide slot has still been seted up to the casing, the angle modulation guide slot with outer bow link cooperatees, so that outer bow link follows the ball follows the angle modulation guide slot rotates.

In an optional embodiment of the present invention, the telescopic mechanism includes a fixed sleeve, a pressure bar, a rotating bar and a spring member;

the fixing sleeve is fixedly arranged in the through hole, the inner wall of the fixing sleeve is provided with a guide groove, the pressure lever is clamped with the rotating rod and can be arranged on the fixing sleeve in a sliding manner, the clamping column is abutted against the rotating rod, and the spring part is abutted against the clamping column;

the pressure lever drives the rotating rod to slide along the guide groove, and under the action of the spring part, the rotating rod has a first state of rotating and sliding at the same time and a second state of sliding along the guide groove.

In an optional embodiment of the present invention, the inner wall of the fixing sleeve is further uniformly and annularly provided with a plurality of engaging portions, each engaging portion includes a first guiding sliding surface, a limiting surface and a second guiding sliding surface, the first guiding sliding surface and the second guiding sliding surface are obliquely arranged in the same direction, the limiting surface extends along the axial direction of the fixing sleeve, and two ends of the limiting surface are respectively connected to the first guiding sliding surface and the second guiding sliding surface;

the rotating rod is provided with a sliding block matched with the guide groove, a rotating guide surface matched with the meshing part is arranged at the clamping position of the rotating rod and the pressing rod, and the rotating guide surface can be matched with the first guide sliding surface or the second guide sliding surface so that the rotating rod rotates relative to the fixed sleeve.

In an optional embodiment of the present invention, the rotating rod is further provided with a first engaging tooth, and the pressing rod comprises a second engaging tooth matching with the first engaging tooth;

the depression bar still includes spacing portion, the inner wall of fixed cover still is provided with spacing tang, spacing portion with spacing tang cooperatees.

In an optional embodiment of the present invention, the outer bow hanging member is made of stainless steel.

The embodiment of the utility model provides a beneficial effect is: design benefit, simple structure, the operation of being convenient for, angle modulation is accurate, and the practicality is strong, is favorable to improving and rescues the effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of an adjustable extraoral arch according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the adjustment member of FIG. 1;

FIG. 3 is a schematic view of the ball of FIG. 2;

FIG. 4 is a schematic view of the housing of FIG. 2;

FIG. 5 is a cross-sectional view of the latch assembly of FIG. 2 mated with the housing;

FIG. 6 is a schematic structural view of the telescoping mechanism of FIG. 5;

fig. 7 is a schematic structural view of the pouch;

FIG. 8 is a schematic structural view of the pressing rod;

fig. 9 is a schematic structural view of the rotating rod.

Icon: 100-adjustable extraoral arch; 10-bow body; 102-an intraoral appliance; 105-an oral fixation body; 11-an adjustment member; 12-a ball bearing; 121-a rotating shaft; 123-positioning groove; 13-a housing; 132-an angle adjustment guide slot; 135-perforating holes; 14-a latch assembly; 15-clamping column; 155-a spring member; 16-a fixation sleeve; 162-a guide groove; 163-limit seam allowance; 164-an engagement portion; 165-a first leading flank; 166-a limiting surface; 167-a second slip guide surface; 17-a compression bar; 172-a limiting part; 175-a second meshing tooth; 18-a turn bar; 182-a slide block; 185-first meshing teeth; 188-a rotating guide surface; 19-outer bow hanging piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

Examples

Fig. 1 is a schematic view of an adjustable extraoral arch 100 provided in this embodiment, please refer to fig. 1.

The adjustable extraoral arch 100 comprises an arch body 10, an adjusting piece 11 and an extraoral arch hanging piece 19, wherein the extraoral arch hanging piece 19 is connected with the arch body 10 through the adjusting piece 11, when the angle of the extraoral arch hanging piece 19 needs to be adjusted, the extraoral arch hanging piece 19 is movably connected with the arch body 10 by pressing a pressure rod 17 on the adjusting piece 11, medical personnel can adjust the angle of the extraoral arch hanging piece 19 relative to the arch body 10 according to requirements, and after the angle is adjusted, the pressure rod 17 is pressed again to lock the extraoral arch hanging piece 19, so that the extraoral arch hanging piece 19 is relatively fixed with the arch body 10.

Aiming at the existing extraoral arch, when the angle of the dental arch is different according to the needs of different patients by medical staff, the existing adjusting mode is manual torsion, so that the required angle is formed.

The adjustable extraoral arch 100 provided by the embodiment can accurately control the angle of the outer arch hanging piece 19 relative to the arch body 10 according to the rotating angle of the adjusting piece 11, and the angle adjustment is convenient and accurate.

The specific structure and the corresponding relationship between the components of the adjustable extraoral arch 100 will be described in detail below.

Fig. 2 is a sectional view of the adjusting member 11, and fig. 1 and 2 are shown.

The bow body 10 comprises an intraoral appliance body 102 and an oral area fixing body 105, an adjusting piece 11 capable of adjusting the angle is arranged between the oral area fixing body 105 and an external bow hanging piece 19, wherein the adjusting piece 11 has a locking state and an unlocking state, the external bow hanging piece 19 and the oral area fixing body 105 are relatively fixed in position in the locking state, and when in the unlocking state, the external bow hanging piece 19 and the oral area fixing body 105 are in movable connection relation, so that the external bow hanging piece 19 can rotate a certain angle relative to the oral area fixing body 105, and medical staff can adjust according to actual requirements.

Specifically, the adjusting member 11 includes a ball 12, a housing 13 and a latch assembly 14, the housing 13 is a hollow spherical structure, the ball 12 is rotatably disposed in the housing 13 along a rotation direction, and the latch assembly 14 is disposed in the housing 13 and can be selectively engaged with the ball 12.

The outer bow hanging piece 19 is fixedly connected with the ball 12, where the fixed connection means that the outer bow hanging piece 19 and the ball 12 can be fixed by welding, or fixedly connected by a connecting piece, or integrally formed, and the like, and the fixing is not limited as long as the outer bow hanging piece 19 and the ball 12 are fixed into a whole.

Wherein, the shell 13 is fixedly connected with the mouth fixing body 105, the shell 13 is provided with an angle adjusting guide groove 132 which can allow the outer bow hanging piece 19 to extend and adjust the angle, and a through hole 135 which allows the latch assembly 14 to extend, the latch assembly 14 is arranged at the through hole 135, and the latch post 15 in the latch assembly 14 has two states of extending and retracting by pressing the pressing rod 17 of the latch assembly 14, and the ball 12 is positioned by the latch post 15.

Fig. 3 is a schematic view of the ball 12, please refer to fig. 3.

The ball 12 is a sphere structure, and may be a hollow sphere or a solid sphere, without limitation, the ball 12 includes an adjusting portion, a fixing portion and a rotating connecting portion, wherein the fixing portion is fixedly connected to the outer bow hanging member 19, the rotating connecting portion is provided with a rotating shaft 121 passing through the center of the sphere, and the ball 12 is rotatably connected to the housing 13 through the rotating shaft 121, so that the ball 12 rotates around the rotating shaft 121 relative to the housing 13.

The regulating part is located the back of fixed part, and the constant head tank 123 has been seted up to the regulating part, and the quantity of constant head tank 123 is a plurality of, and constant head tank 123 sets up along the direction of rotation interval of ball 12, and it can be understood that, the interval between a plurality of constant head tanks 123 is decided according to the angle that outer bow link 19 needs to be adjusted, and the quantity of constant head tank 123 is decided according to its gear that needs angle regulation. In the present embodiment, the positioning grooves 123 are uniformly spaced, and an angle between two adjacent positioning grooves 123 is less than or equal to 5 °.

Fig. 4 is a schematic view of the housing 13, please refer to fig. 4.

The housing 13 may be a hollow hemisphere or a hollow sphere, as long as the ball 12 can be rotatably disposed in the housing 13 along the rotating shaft 121, and meanwhile, one side of the housing 13 opposite to the ball 12 is fixedly connected to the bow body 10.

In this embodiment, the housing 13 is a hollow sphere, the housing 13 is provided with an angle adjustment guide groove 132 and a through hole 135, the angle adjustment guide groove 132 is used for cooperating with the outer bow hanging piece 19, so that the outer bow hanging piece 19 passes through the angle adjustment guide groove 132 and rotates along the angle adjustment guide groove 132 along with the rotation of the ball 12. The latch assembly 14 is disposed through the through hole 135 and is adapted to engage the ball 12.

FIG. 5 is a cross-sectional view of latch assembly 14 engaged with housing 13, as best seen in FIG. 5.

The locking assembly 14 comprises a clamping column 15 and a telescopic mechanism which are mutually abutted, the locking assembly 14 is arranged in the through hole 135, the clamping column 15 is located in the shell 13 relative to the telescopic mechanism, and under the action of the telescopic mechanism, the clamping column 15 has two states, wherein in the first state, the clamping column 15 can protrude out of the inner wall of the shell 13 and is clamped with the positioning groove 123 on the ball 12; in the second state, the latch 15 can be retracted into the inner wall of the housing 13, so that the latch 15 is separated from the ball 12, and the ball 12 drives the outer bow 19 to rotate relative to the housing 13.

The telescopic mechanism can be realized in various ways, and in this embodiment, the telescopic mechanism is a telescopic structure of a ball-point pen cap, which is described in detail below.

Fig. 6 is a schematic structural view of the telescoping mechanism, fig. 7 is a schematic structural view of the fixing sleeve 16, fig. 8 is a schematic structural view of the pressing rod 17, fig. 9 is a schematic structural view of the rotating rod 18, please refer to fig. 6, fig. 7, fig. 8 and fig. 9.

The telescoping mechanism includes a retaining sleeve 16, a compression bar 17, a rotation bar 18, and a spring member 155. The fixed sleeve 16 is fixedly arranged in the through hole 135 of the shell 13, one end of the pressure lever 17 is clamped with the rotating lever 18, the other end of the pressure lever 17 protrudes out of the outer wall of the shell 13, one end of the rotating lever 18, which is far away from the pressure lever 17, is abutted against the clamping column 15, the spring element 155 is abutted against the clamping column 15, and the rotating lever 18 is controlled to move relative to the fixed sleeve 16 by pressing the pressure lever 17.

The telescopic mechanism drives the rotating rod 18 to slide along the guide groove 162 by pressing the pressing rod 17, and further drives the clamping column 15 to slide in the through hole 135, under the action of the spring piece 155, the rotating rod 18 has a first state of simultaneously rotating and sliding, and in the first state, the clamping column 15 extends out of the through hole 135 and is clamped with the ball 12; and a second state in which the rotary rod 18 slides along the guide groove 162, and in the second state, the clamping column 15 is retracted into the through hole 135 and separated from the ball 12.

This fixed cover 16 and the inner wall interference fit of wear-out hole 135, fixed cover 16 include relative spacing end and meshing end, and the inner wall of meshing end evenly encircles and is equipped with meshing portion 164, and the inner wall of spacing end is provided with spacing tang 163, and this spacing tang 163 breaks away from fixed cover 16 from the outside when cooperating with depression bar 17 and being used for restricting depression bar 17 to slide.

Specifically, the inner side wall of the fixing sleeve 16 is provided with a guide groove 162, the guide groove 162 is opened from the engaging end to a limit stop 163, and the guide groove 162 is used for enabling the sliding block 182 of the rotating rod 18 to slide along the guide groove 162.

The number of the engaging portions 164 is plural, the engaging portions 164 and the guide grooves 162 are arranged at intervals, each engaging portion 164 includes a first guide sliding surface 165, a limiting surface 166 and a second guide sliding surface 167, the first guide sliding surface 165 and the second guide sliding surface 167 are arranged in an inclined manner in the same direction, the limiting surface 166 extends along the axial direction of the fixing sleeve 16, and two ends of the limiting surface 166 are respectively connected with the first guide sliding surface 165 and the second guide sliding surface 167.

In the present embodiment, the inclination angle of the first sliding guide surface 165 is the same as the inclination angle of the second sliding guide surface 167, and the extending direction of the limiting surface 166 is parallel to the extending direction of the guide groove 162. The first leading slide surface 165 and the second leading slide surface 167 are each engaged with the rotation guide surface 188 of the rotating lever 18.

The pressing rod 17 is engaged with the rotating rod 18 and slidably disposed on the fixing sleeve 16, the pressing rod 17 includes a limiting portion 172 and a second engaging tooth 175, the limiting portion 172 is engaged with the limiting spigot 163 of the limiting end of the fixing sleeve 16 to limit the pressing rod 17 to be separated from the fixing sleeve 16. The second engaging teeth 175 are saw-toothed, and the saw-toothed shape may be a regular symmetrical saw-toothed shape or an asymmetrical saw-toothed shape, which is not required here, as long as the second engaging teeth 175 of the pressing rod 17 are matched with the first engaging teeth 185 of the rotating rod 18.

The outer wall of the rotating rod 18 is provided with a sliding block 182 which is matched with the guide groove 162 of the fixed sleeve 16, wherein the sliding block 182 extends along the axial direction, a first engaging tooth 185 is arranged at the clamping position of the rotating rod 18 and the pressing rod 17, the first engaging tooth 185 is matched with the second engaging tooth 175 of the pressing rod 17, the first engaging tooth 185 is also matched with the engaging part 164 of the fixed sleeve 16, the first engaging tooth 185 is provided with a rotating guide surface 188, the rotating guide surface 188 can be matched with the first guide sliding surface 165 or the second guide sliding surface 167 of the engaging part 164, the sliding block 182 comprises a first side wall and a second side wall which are positioned at two sides, and the first side wall and the second side wall are matched with the guide groove 162 of the fixed sleeve 16. So that the first and second side walls of the slider 182 slide along the guide groove 162 and the rotation guide surface 188 slides along the first and/or second

guide sliding surfaces

165 and 167.

Optionally, the first engagement teeth 185 of the rotating rod 18 and the second engagement teeth 175 of the pressing rod 17 are both serrated and engaged with each other.

Optionally, the spring element 155 is disposed in the through hole 135 of the housing 13 and sleeved on the clamping column 15, the clamping column 15 is provided with a limit boss, the spring element 155 is located on one side close to the ball 12 relative to the pressing rod 17, and after assembly, the spring element 155 is located between the limit boss on the inner wall of the fixing sleeve 16 and the limit boss of the clamping column 15.

The pressing rod 17 drives the rotating rod 18 to be slidably disposed in the fixing sleeve 16, and the rotating rod 18 has a clamping state of driving the clamping column 15 to extend out of the through hole 135 of the housing 13 and a separation state of driving the clamping column 15 to retract into the through hole 135 of the housing 13 under the action of the spring member 155.

The working principle of the adjusting piece 11 is as follows: under the action of the spring member 155 and the latch 15, the rotating rod 18 is always subjected to an upward force, when the pressing rod 17 is pressed, the pressing rod 17 drives the rotating rod 18 to move downwards along the guide groove 162 under the action of an external force, and when the rotating rod 18 is disengaged from the notch of the guide groove 162, the radial force generated by the saw-tooth shape of the end part of the pressing rod 17 at the contact part of the rotating rod 18 and the rotating guide surface 188 forces the rotating rod 18 to rotate, so that the rotating rod 18 is meshed with the guide groove 162 again. The pressing rod 17 is pressed again, and the above actions are repeated, and the retracted state and the extended state of the clamping column 15 are respectively represented.

When the clamping column 15 is in a retracted state, the ball 12 rotates relative to the housing 13, the outer bow hanging piece 19 rotates along with the rotation of the ball 12, and further the angle between the outer bow hanging piece 19 and the bow body 10 is adjusted, when the clamping column 15 is in an extended state, the clamping column 15 is clamped with one positioning groove 123 of the ball 12, the ball 12 is fixedly connected relative to the housing 13, and at the moment, the outer bow hanging piece 19 is fixed relative to the bow body 10.

Optionally, current extraoral arch adopts the iron wire to make, and in the use, especially when the patient wears night sleep, easy deformation to influence extraoral arch's effort, and then influence the oral cavity and correct the effect, in this embodiment, outer bow link 19 adopts stainless steel, and non-deformable keeps adding the direction of strength and force that can be fine.

Optionally, the adjustable extraoral arch 100 provided in this embodiment is a symmetrical structure, and the external arch hanging piece 19 and the adjusting piece 11 are both arranged in pairs and oppositely arranged on both sides of the oral cavity.

The embodiment of the utility model provides an adjustable extraoral bow 100 has beneficial effect is:

reasonable in design, ingenious, simple structure, convenient operation through setting up regulating part 11, when needs are adjusted, directly presses the depression bar 17 of regulating part 11, just can realize that the couple direction of outer bow link 19 adjusts the angle that needs, and the medical personnel of being convenient for adjust the angle of outer bow link 19 as required, and the angle modulation is accurate, articulates the convenience during use, and the practicality is strong.

It should be noted that, in the case of conflict, the features in the embodiments of the present invention may be combined with each other.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable extraoral arch is characterized by comprising an arch body, an external arch hanging piece and an adjusting piece, wherein the external arch hanging piece is connected with the arch body through the adjusting piece;

2. The adjustable extraoral bow of claim 1, wherein the adjustment member comprises a ball fixedly connected to the extraoral bow hanger, a housing fixedly connected to the bow body, the ball rotatably disposed within the housing, and a latch assembly disposed within the housing and selectively engageable with the ball.

3. The adjustable extraoral bow of claim 2, wherein the latch assembly comprises a latch post and a telescoping mechanism abutted against each other, the housing is provided with a through hole, the latch assembly is arranged in the through hole so that the latch post is positioned inside the housing relative to the telescoping mechanism, and the ball is provided with a positioning groove;

4. The adjustable extraoral arch of claim 3 wherein the number of detents is multiple, the detents being spaced apart in the direction of rotation of the ball.

5. The adjustable extraoral arch of claim 3 wherein the ball further comprises a fixed portion and a rotational connection portion, the fixed portion being disposed opposite the positioning slot, the outer arch link being fixedly connected to the fixed portion;

6. The adjustable extraoral bow of claim 2, wherein the housing is a hollow sphere, and the housing further defines an angle adjustment guide slot, the angle adjustment guide slot cooperating with the outer bow hanging member to allow the outer bow hanging member to rotate along the angle adjustment guide slot along with the ball.

7. The adjustable extraoral arch of claim 3, wherein the telescoping mechanism includes a retaining sleeve, a pressure bar, a rotation bar, and a spring member;

8. The adjustable extraoral arch of claim 7, wherein the inner wall of the retaining sleeve is further uniformly provided with a plurality of engaging portions, each engaging portion includes a first guiding sliding surface, a limiting surface and a second guiding sliding surface, the first guiding sliding surface and the second guiding sliding surface are obliquely arranged in the same direction, the limiting surface extends along the axial direction of the retaining sleeve, and two ends of the limiting surface are respectively connected with the first guiding sliding surface and the second guiding sliding surface;

9. The adjustable extraoral arch of claim 7, wherein the rotating lever is further provided with a first engaging tooth, and the pressing lever includes a second engaging tooth that mates with the first engaging tooth;

10. The adjustable extraoral arch of any one of claims 1-9 wherein the extraoral arch hanger is stainless steel.