CN116898599B

CN116898599B - Traction hook and traction assembly for invisible correction

Info

Publication number: CN116898599B
Application number: CN202310658835.5A
Authority: CN
Inventors: 金樱; 裴芳; 赵志河; 王一凡
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2024-07-09
Anticipated expiration: 2043-06-05
Also published as: CN116898599A

Abstract

A draw hook and traction assembly for stealthy correction, draw the hook to include the bottom plate, be connected with first pole on the bottom plate, it has the second pole to articulate on the first pole, be connected with the couple on the second pole, threaded connection has the regulating part on the outer wall of second pole, the cover is equipped with the sleeve on the outer wall of regulating part, sleeve, regulating part can be followed second pole synchronous movement, just the regulating part can for the sleeve rotates, articulated on the sleeve have the connecting rod, the connecting rod with first pole articulates. According to the traction hook, the direction and the length of the force arm of the traction hook can be changed by adjusting the included angle between the first rod and the second rod and the length of the third rod, so that the damage to oral mucosa in the correction process can be avoided, the force arm can be adjusted without frequently replacing traction hooks with different types and specifications, and therefore enough tension is applied to teeth to be corrected, and the correction effect is effectively improved.

Description

Traction hook and traction assembly for invisible correction

Technical Field

The invention relates to the field of oral appliances, in particular to a traction hook for invisible correction and a traction assembly comprising the traction hook.

Background

The invisible bracket-free correction has the advantages of comfort, convenience, beautiful appearance and the like as the steel wire and the bracket are not required to be arranged, and gradually becomes a mistakeThe first choice of malformed patients and orthodontists. Currently, brackets-free invisible appliance can be used for most mistakesMalformations such as crowding, post-molar and tooth extraction cases, and complex cases such as orthodontic orthognathic combination therapies. However, when the bracket-free invisible appliance is applied to tooth extraction cases, the rear teeth often have mesial inclination, the front teeth tongue inclination and the side openingThe roller coaster phenomenon of (a) is especially suitable for a large number of cases of anterior posterior tooth movement, so that the conditions of sleeve removal and the like occur, and the treatment has to be restarted when serious.

In order to know the mesial inclination which occurs when the bracket-free invisible appliance is used in a tooth extraction case, one of the solutions is to bond a traction hook on teeth which are inclined at two sides of a tooth extraction gap, and to utilize the traction hook to draw the teeth, so as to prolong the arm of force, enable the action point to approach or exceed the impedance center of the teeth, realize the integral movement of the teeth as much as possible, and finally close the tooth extraction gap.

The traction hook special for the bracket-free invisible correction disclosed by the patent CN209136921U comprises a bottom plate, wherein the middle part of the bottom plate is provided with an abduction hook which is fixedly connected with the bottom plate and is formed by a Z-shaped folding rod and an umbrella handle-shaped hook part, the abduction hook is vertically connected with the center of the bottom plate, the compression of gums is avoided, the length is consistent with the central impedance position of teeth, the integral movement of teeth is facilitated, and only a small amount of transparent tooth sleeves are needed to be cut off or the abduction hook can be avoided without cutting. The patent CN211325742U discloses an integrated root control lever of personalized design for orthodontics, and it includes the bottom plate that can bond in the tooth face and with bottom plate integrated into one piece's towing hook, utilizes this towing hook to close the tooth clearance and can avoid patient's oral cavity to be scratched or the risk of scratch by the towing hook, improves patient's comfort level of wearing.

However, after the traction hooks of the existing bracket-free invisible correction are installed, because the action points of the forces are fixed and cannot be adjusted, the traction hooks with different types and specifications are required to be disassembled and assembled for many times in the closing process of the tooth extraction gap so as to change the direction and the length of the force arm to ensure enough traction force, and the correction effect is affected to a certain extent. In addition, when the traction hook is replaced, whether the tooth socket is favorable for windowing or not and whether the oral mucosa is scratched or not needs to be considered, and the operation requirement on correction is high.

Disclosure of Invention

The invention aims to provide a traction hook for invisible correction, which is adhered to a tooth surface, and can change the force arm direction of the traction hook by adjusting the angle between a first rod and a second rod and adjust the position of an action point, so that the force arm direction is adjusted according to the correction process on the premise of not affecting the windowing of a tooth socket and not scratching oral mucosa, the sufficient traction force is ensured, meanwhile, the disassembly and the assembly of traction hooks of different types are avoided, and the correction effect is improved.

The invention is realized by the following technical scheme:

The utility model provides a draw hook for stealthy correction, includes the bottom plate, be connected with first pole on the bottom plate, it has the second pole to articulate on the first pole, be connected with the couple on the second pole, threaded connection has the regulating part on the outer wall of second pole, the cover is equipped with the sleeve on the outer wall of regulating part, sleeve, regulating part can be followed second pole synchronous movement, just the regulating part can for the sleeve rotates, articulated on the sleeve has the connecting rod, the connecting rod with first pole articulates.

In the technical scheme, the bottom plate of the traction hook is used for bonding the tooth surface so as to integrally fix the traction hook on the teeth to be corrected. The base plate is directly or indirectly connected with a first rod. The first rod is hinged with the second rod, in one or more embodiments, a pin hole can be arranged on the first rod and the second rod, the pin shaft penetrates through the pin hole to realize hinging, in some embodiments, a pin hole is arranged on any one of the first rod and the second rod, and a pin shaft is arranged on the other rod to realize hinging. Through articulated connected mode, the second pole can overturn certain angle for first pole, and then when making the towing hook installation, can be in order to be favorable to the windowing of transparent facing through adjusting first pole to suitable position, make the second pole keep away from the bottom plate simultaneously, under the prerequisite of guaranteeing certain arm of force, allow changing the couple through the contained angle between adjustment second pole and the first pole, also the action point position promptly, not only can avoid the damage oral mucosa at the in-process of correcting, and the position of action point and the direction of arm of force can be adjusted to the towing hook that need not frequently to change different model specifications, thereby treat the tooth of correcting and exert sufficient tension, improve the effect of correcting effectively.

In order to achieve a stable holding of the first and second bars at the desired angle during the correction process. An adjusting member movable in the second shaft axis direction is provided on the outer wall of the second shaft. The adjusting piece is connected with the second rod through threads. In a partially preferred embodiment, the second rod is provided with a first thread of connection and the adjustment member is provided with a second thread matching the first thread, such that the adjustment member is movable back and forth in the axial direction of the second rod upon rotation of the adjustment member relative to the second rod.

The inner side of the adjusting piece is in threaded connection with the outer wall of the second rod, and a sleeve is sleeved on the outer side of the adjusting rod. The sleeve is arranged such that it can be moved back and forth along the axis of the second rod in synchronization with the adjustment member, while the adjustment member can be rotated relative to the sleeve and the second rod. In one or more embodiments, a locking protrusion extending along the circumferential direction of the sleeve may be disposed on the inner wall of the sleeve, and a locking groove extending along the circumferential direction of the adjusting member may be disposed on the outer wall of the adjusting member, where the matching of the circumferential locking protrusion and the locking groove enables the adjusting member to rotate relative to the sleeve, and also drive the sleeve to move along the axial direction of the second shaft.

In this technical scheme still is provided with the connecting rod between sleeve and first pole, and the one end and the sleeve of connecting rod are articulated, and the other end articulates to first pole. During operation, can drive the sleeve through rotating the regulating part and remove along the second pole, because the length of connecting rod is certain, consequently along with the sleeve removes to the couple direction, the contained angle between first pole and the second pole reduces gradually, and similarly, when the sleeve removes to the direction of first pole, the contained angle between first pole and the second pole increases gradually to realized in the correction process, first pole and second pole can keep in expected contained angle steadily.

In the technical scheme, the expected included angle can be not only 30 degrees, 45 degrees and 90 degrees which are commonly used, but also can be adjusted at will according to actual requirements by the threaded connection between the second rod and the adjusting piece, so that the operation is more flexible, the correction effect is effectively improved, and the stability of the threaded connection in the angle adjusting process is also improved to a certain extent; moreover, first pole, second pole and connecting rod have constituted stable triangle connection structure, can keep the contained angle between first pole and the second pole steadily under the rubber band pulls, compare in the tradition and rely on the doctor to buckle by oneself and form the mode of certain angle, angle modulation is more convenient, accurate, firm.

As a preferable connection mode of the adjusting piece and the sleeve, the outer wall of the adjusting piece is provided with a plurality of second grooves extending along the circumferential direction of the outer wall of the adjusting piece, the inner wall of the sleeve is provided with a plurality of first grooves extending along the circumferential direction of the inner wall of the sleeve, the first grooves and the second grooves are in one-to-one correspondence to form a ball cavity, and a plurality of balls are arranged in the ball cavity.

In the technical scheme, corresponding grooves are formed in the adjusting piece and the sleeve, and the grooves extend along the circumference of the adjusting piece or the sleeve. The first and second grooves are in one-to-one correspondence to form ball cavities extending circumferentially along the adjustment member or sleeve. The ball cavity is internally provided with a plurality of balls, so that the friction force between the sleeve and the adjusting piece can be effectively reduced, the adjusting piece is easier to rotate under the small size, the balls can play a limiting role, and the sleeve is prevented from moving along the axial direction relative to the adjusting piece.

Further, a first thread is arranged on the outer wall of the second rod, and a second thread matched with the first thread is arranged on the inner wall of the adjusting piece.

As a preferred embodiment of the invention, the traction hook not only can change the direction of the force arm by adjusting the included angle between the first rod and the second rod, but also can adjust the length of the force arm by utilizing the movement of the third rod relative to the second rod, thereby enriching the adjustment mode of the action point of force.

Specifically, be provided with on the second pole and hold the chamber, hold intracavity threaded connection and have the third pole, connect the couple on the third pole, the couple is located hold the outside in chamber. In the technical scheme, a third rod which can at least partially move in or out of the accommodating cavity is arranged in the accommodating cavity, and a hook is arranged at one end of the third rod, which is positioned outside the accommodating cavity. In one or more embodiments, the hook may either rotate relative to the axis of the third lever, i.e., the bus bar of the third lever, or be fixedly connected to the third lever. Through moving the third pole into or out of the accommodating cavity, the total length of the second pole and the third pole can be reduced or increased, and then the length of the force arm is shortened or prolonged, so that the requirements of different force arm lengths in the correction process are met.

In the technical scheme, the accommodating cavities of the third rod and the second rod are connected through threads. When the length of the arm of force is adjusted, the third rod is rotated clockwise or anticlockwise, and can be screwed into or out of the accommodating cavity of the second rod, so that the operation is very convenient; and after the third rod is adjusted to an ideal position, the hook is connected with the other lingual side buckle by utilizing the rubber band, the component force of the traction force of the rubber band along the axial direction of the third rod enables the threads to be meshed stably, the third rod is not easy to rotate relative to the accommodating cavity, and further the stable connection of the second rod and the third rod in any required length is realized. At the same time, the length of the thread between the third rod and the accommodating cavity determines the adjusting precision, and the total length of the force arm can be accurately adjusted during correction.

As a preferred threaded connection of the second and third bars in the present invention. The inner wall of the accommodating cavity is provided with a third thread, the third thread extends from one end of the accommodating cavity to the other end of the accommodating cavity, and the third rod is provided with a fourth thread matched with the third thread.

In this solution, the second rod and the third rod are connected by means of a continuous thread. Specifically, the third thread provided on the inner wall of the accommodating cavity extends continuously from one end of the accommodating cavity to the other end of the accommodating cavity, i.e. there is only one continuous thread section in the accommodating cavity. The profile of the third thread may be of various configurations, such as triangular threads, rectangular threads, etc. The size and the structure of the fourth thread arranged on the outer wall of the third rod are matched with those of the third thread, so that the third rod can be screwed into or out of the accommodating cavity by rotating the third rod, and the length of the force arm is adjusted.

As another preferred screw connection of the second rod and the third rod in the present invention. Along the extending direction of the accommodating cavity, a plurality of sections of thread sections are arranged on the inner wall of the accommodating cavity, and a fifth thread matched with the plurality of sections of thread sections is arranged on the third rod.

In the technical scheme, the second rod and the third rod are connected through discontinuous multi-section thread segments. Specifically, the inner wall of the accommodating cavity is provided with a plurality of thread segments. In one or more embodiments, the distance between two adjacent thread segments may be the same or different; the lengths of the thread segments can be the same or different, but the thread structures and the sizes of the thread segments are the same, and the thread structures and the sizes of the thread segments are matched with those of the fifth thread arranged on the third rod. The length of the fifth thread is preferably smaller than the distance between two adjacent thread segments, so that the fifth thread needs to be rotated in combination with the latter thread segment by a certain sliding distance after passing the former thread segment during rotation of the third rod, thereby achieving a fast positioning by damping reduction.

Further, the hook is rotatable about an axis of the third lever. In the process of adjusting the arm of force, when the third pole is expected to rotate to specific position, if couple and third pole fixed connection then probably appear the couple tip and face gum or oral mucosa, perhaps pass through the condition of gum or oral mucosa in the rotation in-process, lead to the couple to scratch gum or oral mucosa easily. In this technical scheme, set up the couple into can rotate for the axis of third pole to make the pivoted in-process of third pole, the couple can remain ideal position throughout, for example couple vertical upwards or downwards, perhaps after the third pole rotates to specific position, through rotating the couple with its ideal position of regulation, and then avoid the injury of couple to gum or oral mucosa effectively. In one or more embodiments, the hook is provided with a clamping piece, the end part of the third rod is provided with a clamping groove for clamping the clamping piece, and the hook can rotate around the axis of the third rod through structural design of the clamping groove and the clamping piece. In a part of the preferred embodiment, the clamping member of the hook is connected to the cylindrical section on the hook and the limiting member is connected to the end of the cylindrical section, the limiting member can be spherical, disc-shaped or the like, the clamping groove comprises a cylindrical groove and a limiting groove, the cylindrical groove is used for accommodating the cylindrical section, the limiting groove is used for accommodating the limiting member, the shape of the limiting groove is matched with that of the limiting member, for example, the limiting groove is spherical, disc-shaped or the like, and the hook is allowed to rotate relative to the third rod while the hook is prevented from moving out of the third rod.

Further, a guide rod is arranged in the accommodating cavity, and the third rod is at least partially sleeved on the guide rod. In the technical scheme, be provided with the guiding hole on the third pole, the degree of depth of guiding hole is greater than or equal to the length of guiding rod, the guiding rod inserts to in the guiding hole to make the direction that the third pole can follow the guiding rod remove. When the third rod is rotated, the guide rod can play a good guiding and positioning role for continuous or segmented threads, and particularly for the connection mode of multi-segment thread segments. In one or more embodiments, the guide bar may be made of a material having a strength greater than that of the third bar to improve the connection strength of the third bar and the second bar.

Further, a boss is provided on the base plate, and the first lever is fixed to the boss. The bulge part enables a certain thickness to be formed between the bottom plate and the third rod, and the traction hook can be further prevented from pressing gum or oral mucosa.

In one or more embodiments, one or more graduation marks may be provided on the outer wall of the third lever to identify the length of the portion of the current third lever that is located within the second lever, thereby facilitating a determination of the total length of the current moment arm.

It is another object of the present invention to provide a traction assembly for invisible correction comprising any one of the traction hooks described above, further comprising a lingual clasp, and a rubber band for connecting the traction hook and the lingual clasp. When the tooth traction device is used, the lingual buckle and the traction hook are respectively adhered to different teeth, and the teeth where the traction hook is positioned are pulled to move in the expected direction by utilizing the lingual buckle and the rubber band.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. According to the traction hook, the included angle between the first rod and the second rod can be changed by rotating the adjusting piece, so that the force arm direction of the traction hook and the position of the force acting point are changed, the damage to oral mucosa in the correction process can be avoided, the position of the force acting point and the force arm direction can be adjusted without frequently replacing the traction hooks with different types and specifications, and therefore enough tension is applied to teeth to be corrected, and the correction effect is effectively improved;

2. the invention can flexibly adjust the included angle between the first rod and the second rod to a desired position by using the threaded connection between the second rod and the adjusting piece, and can increase the stability in the angle adjusting process;

3. The invention utilizes the first rod, the second rod and the connecting rod to form a stable triangle connection structure, and can stably maintain the included angle between the first rod and the second rod under the pulling of the rubber band, compared with the traditional mode of forming a certain angle by bending by a doctor, the angle adjustment is more convenient, accurate and stable;

4. According to the invention, the friction force between the sleeve and the adjusting piece can be effectively reduced by utilizing the balls in the ball cavity, so that the adjusting piece is easier to rotate under a small size, and the balls can play a limiting role to prevent the sleeve from moving along the axial direction relative to the adjusting piece;

5. the length of the force arm is adjusted by using the second rod and the third rod, so that the adjustment mode of the force application point is further enriched, and the requirements of different force arm lengths in the correction process are met;

6. the invention can flexibly adjust the direction and the length of the force arm, not only can ensure enough traction force to the teeth to be corrected, but also can effectively reduce the damage of the traction hook to the oral mucosa, and is beneficial to the windowing of the transparent dental mouthpiece.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

FIG. 1 is a schematic view of the structure of a first bar and a second bar of a towing hook of one construction in accordance with an embodiment of the present invention at right angles;

FIG. 2 is a schematic cross-sectional view of a second rod, adjuster, sleeve along a first cross-sectional line in accordance with an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a second rod, adjuster, sleeve along a second cross-sectional line in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of the first and second bars of a towing hook in an embodiment of the present invention at an acute angle;

FIG. 5 is a schematic view of the structure of the first and second bars of the towing hook of one configuration in accordance with an embodiment of the present invention at an obtuse angle;

FIG. 6 is a schematic view of the first and second bars of another alternative construction of a towing hook in accordance with an embodiment of the present invention at right angles;

FIG. 7 is a schematic illustration of a connection of a second rod to a third rod in accordance with an embodiment of the present invention;

FIG. 8 is a schematic illustration of another connection of a second rod to a third rod in an embodiment of the invention;

FIG. 9 is a schematic view of the connection of the hook and the third rod in an embodiment of the invention;

FIG. 10 is a schematic illustration of the connection of a first lever to a base plate in an embodiment of the present invention;

fig. 11 is a schematic view of a towing hook towing an inclined tooth in an embodiment of the present invention.

In the drawings, the reference numerals and corresponding part names:

1-a bottom plate, 11-a boss, 2-a first rod, 3-a second rod, 31-a first thread, 32-a receiving cavity, 33-a third thread, 341-a first thread section, 342-a second thread section, 343-a third thread section, 35-a guide rod, 4-an adjusting member, 41-a second thread, 42-a second groove, 5-a sleeve, 51-a first groove, 52-a ball, 6-a connecting rod, 7-a hook, 71-a stopper, 72-a cylindrical section, 8-a ball cavity, 9-a third rod, 91-a fourth thread, 92-a fifth thread, 93-a scale mark, 94-a cylindrical groove, 95-a stopper;

101-first inclined teeth, 102-second inclined teeth, 103-first teeth, 104-second teeth;

201-lingual side buckle, 202-rubber band.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present invention.

Example 1:

The utility model provides a draw hook for stealthy correction as shown in fig. 1 through 5, includes bottom plate 1, be connected with first pole 2 on the bottom plate 1, it has second pole 3 to articulate on the first pole 2, be connected with couple 7 on the second pole 3, threaded connection has regulating part 4 on the outer wall of second pole 3, the cover is equipped with sleeve 5 on the outer wall of regulating part 4, sleeve 5, regulating part 4 can follow second pole 3 synchronous movement, just regulating part 4 can for sleeve 5 rotation, articulated on sleeve 5 have connecting rod 6, connecting rod 6 with first pole 2 articulates.

During operation, as shown in fig. 4 and 5, the sleeve can be driven to move along the second rod by rotating the adjusting piece, the included angle between the first rod and the second rod is gradually reduced along with the movement of the sleeve towards the hook direction, and similarly, when the sleeve moves towards the first rod, the included angle between the first rod and the second rod is gradually increased, so that the first rod and the second rod can be stably kept at the expected included angle in the correction process.

In one or more embodiments, the length of the first rod is 4-6 mm, preferably 5mm.

In a part of preferred embodiments, the outer wall of the adjusting member 4 is provided with a plurality of second grooves 42 extending along the circumferential direction of the outer wall of the adjusting member 4, the inner wall of the sleeve 5 is provided with a plurality of first grooves 51 extending along the circumferential direction of the inner wall of the sleeve 5, the first grooves 51 and the second grooves 42 are in one-to-one correspondence to form a ball cavity 8, and a plurality of balls 52 are arranged in the ball cavity 8. In one or more embodiments, the number of ball cavities may be at least three.

In some embodiments, the inner wall of the sleeve may be provided with a clamping protrusion extending along the circumferential direction of the sleeve, and the outer wall of the adjusting member may be provided with a clamping groove extending along the circumferential direction of the adjusting member, where the circumferential clamping protrusion and the clamping groove cooperate to enable the adjusting member to rotate relative to the sleeve, and also drive the sleeve to move along the axial direction of the second shaft.

In some embodiments, the outer wall of the second rod 3 is provided with a first thread 31, and the inner wall of the adjusting member 4 is provided with a second thread 41 matching the first thread 31. In one or more embodiments, the total length of the second thread on the adjustment member is greater than the total length of the first thread on the second rod, such that the adjustment member and sleeve have a longer stroke in the axial direction of the second rod.

In some embodiments, as shown in fig. 10, a boss 11 is provided on the base plate 1, and the first lever 2 is fixed to the boss 11. The raised portion allows a certain thickness, for example 2mm, between the base plate and the first rod, which further prevents the traction hooks from pressing against the gums or oral mucosa.

Example 2:

On the basis of the embodiment 1, as shown in fig. 6 and 7, a containing cavity 32 is arranged on the second rod 3, a third rod 9 is connected in the containing cavity 32 in a threaded manner, a hook 7 is connected to the third rod 9, and the hook 7 is positioned outside the containing cavity 32; the inner wall of the accommodating cavity 32 is provided with a third thread 33, the third thread 33 extends from one end of the accommodating cavity 32 to the other end of the accommodating cavity 32, and the third rod 9 is provided with a fourth thread 91 matched with the third thread 33.

The second rod and the third rod are connected through continuous threads, and the continuous threads are characterized in that the moment arm can be adjusted to any length in the stroke according to the requirement.

In a partially preferred embodiment, the outer wall of the third rod is provided with a plurality of graduation marks. The graduation marks are beneficial to judging the total length of the current force arm.

In some embodiments, the hook 7 can rotate around the axis of the third rod 9, so that the hook can always maintain a desired position during the rotation of the third rod, for example, the hook is vertically upward or downward, or after the third rod rotates to a specific position, the hook is adjusted to a desired position by rotating the hook, thereby effectively avoiding the damage of the hook to gums or oral mucosa. In one or more embodiments, the clamping member of the hook is connected to the cylindrical section on the hook and the limiting member is connected to the end of the cylindrical section, the limiting member can be spherical, disc-shaped or the like, the clamping groove comprises a cylindrical groove and a limiting groove, the cylindrical groove is used for accommodating the cylindrical section, the limiting groove is used for accommodating the limiting member, the shape of the limiting groove is matched with that of the limiting member, for example, the limiting groove is spherical, disc-shaped or the like, and the hook is allowed to rotate relative to the third rod while the hook is prevented from moving out of the third rod.

In one or more embodiments, the cylindrical section of the clamping groove can be further provided with a plurality of small clamping grooves distributed along the circumferential direction of the clamping groove, the small clamping grooves extend along the axial direction of the cylindrical section of the clamping groove, similarly, the cylindrical section of the clamping piece is provided with small clamping protrusions distributed along the circumferential direction of the cylindrical section of the clamping piece, the small clamping protrusions are matched with the small clamping grooves, and the small clamping protrusions are of elastic structures such as rubber, so that the rotating angle of the hook can be positioned faster when the hook is rotated, and meanwhile the rotating damping of the hook is increased when the hook is pulled by the rubber band, so that the stability of connection is improved.

Example 3:

On the basis of the above embodiment, as shown in fig. 8, along the extending direction of the accommodating cavity 32, a plurality of thread segments are provided on the inner wall of the accommodating cavity 32, and a fifth thread 92 matching with the plurality of thread segments is provided on the third rod 9.

In this embodiment, the second rod and the third rod are connected by discrete multi-segment threaded segments. The segmented threaded connection is characterized in that the common specific length, such as 5mm, 6mm and the like, can be rapidly positioned when the length of the force arm is adjusted, and the adjustment accuracy of the specific length of the force arm is improved.

In a partially preferred embodiment, as shown in fig. 8, a guide rod 35 is disposed in the accommodating chamber 32, and the third rod 9 is at least partially sleeved on the guide rod 35. In some embodiments, an elastic layer, such as a rubber layer, is further disposed on the outer wall of the guide rod, so as to fill the gap between the inner wall of the guide hole and the outer wall of the guide rod, thereby further improving the connection strength.

Example 4:

A traction assembly for invisible correction comprising a traction hook according to any of the previous embodiments, and a lingual clasp 201, and further comprising a rubber band 202 for connecting the traction hook and the lingual clasp 201.

As shown in fig. 11, after the teeth between the second inclined teeth 102 and the first teeth 103 in the upper right region are extracted, the first inclined teeth 101 and the teeth on both sides thereof are inclined. To apply sufficient traction to the first inclined teeth 101, a traction hook is installed on the first inclined teeth 101, a lingual side clasp 201 is installed on the second teeth 104 of the lower right area, and then the traction hook and the lingual clasp 201 are connected by a rubber band 202 to form proper traction to the first inclined teeth 101.

The use of "first," "second," etc. (e.g., first rod, second rod, first thread, second thread, third thread, etc.) in the present invention is merely for clarity of description to distinguish corresponding components and is not intended to limit any order or emphasize importance, etc. The term "connected" used in the present invention may be directly connected or indirectly connected via other members unless otherwise specified.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. The utility model provides a draw hook for stealthy correction, includes bottom plate (1), be connected with first pole (2) on bottom plate (1), its characterized in that, articulated on first pole (2) have second pole (3), be connected with couple (7) on second pole (3), threaded connection has regulating part (4) on the outer wall of second pole (3), the cover is equipped with sleeve (5) on the outer wall of regulating part (4), sleeve (5), regulating part (4) can follow second pole (3) synchronous movement, and regulating part (4) can rotate for sleeve (5), articulated on sleeve (5) have connecting rod (6), connecting rod (6) are articulated with first pole (2); the adjusting device comprises an adjusting piece (4), and is characterized in that a plurality of second grooves (42) extending along the circumferential direction of the outer wall of the adjusting piece (4) are formed in the outer wall of the adjusting piece (4), a plurality of first grooves (51) extending along the circumferential direction of the inner wall of the sleeve (5) are formed in the inner wall of the sleeve (5), the first grooves (51) and the second grooves (42) are in one-to-one correspondence and form a ball cavity (8), and a plurality of balls (52) are arranged in the ball cavity (8).

2. A traction hook for invisible correction according to claim 1, wherein the outer wall of the second rod (3) is provided with a first thread (31), and the inner wall of the adjusting member (4) is provided with a second thread (41) matching the first thread (31).

3. A traction hook for invisible correction according to claim 1, wherein the second rod (3) is provided with a containing cavity (32), a third rod (9) is connected to the containing cavity (32) through internal threads, a hook (7) is connected to the third rod (9), and the hook (7) is located outside the containing cavity (32).

4. A traction hook for invisible correction according to claim 3, wherein a third thread (33) is provided on the inner wall of the receiving cavity (32), the third thread (33) extends from one end of the receiving cavity (32) to the other end of the receiving cavity (32), and a fourth thread (91) matching the third thread (33) is provided on the third rod (9).

5. A traction hook for invisible correction according to claim 3, wherein a plurality of sections of screw threads are provided on the inner wall of the receiving chamber (32) along the extension direction of the receiving chamber (32), and a fifth screw thread (92) matching the plurality of sections of screw threads is provided on the third rod (9).

6. A traction hook for stealth correction according to claim 3, characterized in that the hook (7) is rotatable around the axis of the third bar (9).

7. A traction hook for invisible correction according to any one of claims 3 to 6, wherein a guide rod (35) is arranged in the accommodating cavity (32), and the third rod (9) is at least partially sleeved on the guide rod (35).

8. A traction hook for invisible correction according to claim 1, wherein the base plate (1) is provided with a boss (11), and the first rod (2) is fixed to the boss (11).

9. A traction assembly for invisible correction comprising a traction hook according to any one of claims 1 to 8, and a lingual clasp (201), further comprising a rubber band (202) for connecting the traction hook and the lingual clasp (201).