Rotation adjusting device and cervical vertebra fixator

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a rotary adjusting device and a cervical vertebra fixator, the rotary adjusting device is arranged between a first adjusting part and a second adjusting part, the first adjusting part rotates relative to the second adjusting part in the preset direction, and the second adjusting part rotates relative to the first adjusting part in the preset direction. Comprising a rotating part arranged on the first adjusting part and a clamping part arranged on the second adjusting part, the rotating part is provided with ratchet teeth, a plurality of ratchet teeth are arranged along the circumferential side face of the rotating part at intervals, a positioning groove is formed between every two adjacent ratchet teeth, and all the ratchet teeth are obliquely arranged; the inclination direction of the ratchet teeth is opposite to the preset direction; the clamping piece is provided with clamping teeth, the number of the clamping teeth is at least two, the clamping teeth are arranged side by side at intervals, and each clamping tooth can be correspondingly inserted into one positioning groove. According to the rotation adjusting device, the reliability of clamping connection between the rotating piece and the clamping piece is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of medical equipment, and more specifically, to a rotation adjustment device and a cervical fixator. Background Art

[0002] Existing cervical fixators generally include a bracket and a mandibular support bracket. The bracket matches the curve of the human neck. The cervical fixator can be worn on the human body through the bracket and can support the back of the human head. The mandibular support bracket supports the human mandible, thereby fixing and protecting the human cervical spine. In order to facilitate wearing and be suitable for different people, the mandibular support bracket is rotatably set on the bracket, so that the mandibular support bracket can be adjusted to move toward the human chin to achieve effective support for the human chin. However, most mandibular support brackets use button rotation or long rack adjustment. The button rotation operation of the former requires a large operating torque; and the latter uses a rack adjustment and elevation, which is also difficult to operate and noisy.

[0003] In view of the above situation, a Chinese invention patent application with publication number CN113855363A discloses an adjustment device, including a rotating structure and a positioning structure, wherein a single-tooth pawl and a ratchet wheel structure are used between the rotating structure and the positioning structure to achieve adjustment, and the rotating structure and the positioning structure are applied to a cervical fixator, so that the mandibular support bracket can rotate relative to the bracket and achieve angle positioning of the mandibular support bracket. However, the single-tooth pawl and ratchet wheel structure is prone to problems such as slipping teeth or loose engagement due to friction during long-term use, and the reliability of the adjustment device is poor. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a rotation adjustment device and a cervical fixator to solve the technical problem of poor reliability of the adjustment device of the cervical fixator in the prior art.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] A first aspect provides a rotation adjustment device, which is arranged between a first adjustment member and a second adjustment member, wherein the first adjustment member rotates relative to the second adjustment member along a predetermined direction, comprising:

[0007] A rotating member disposed on the first adjusting member, the rotating member being provided with ratchet teeth, a plurality of ratchet teeth being arranged at intervals along the circumferential side surface of the rotating member, a positioning groove being formed between two adjacent ratchet teeth, each of the ratchet teeth being arranged obliquely, and the inclination direction of the ratchet teeth being opposite to the predetermined direction;

[0008] The engaging member is arranged on the second adjusting member, and the engaging member is provided with a locking tooth. At least two locking teeth are arranged in parallel and at intervals, and each of the locking teeth can be correspondingly inserted into one of the positioning grooves.

[0009] In one embodiment of the first aspect, a distance between two adjacent latching teeth is equal to a distance between two adjacent positioning grooves.

[0010] In one embodiment of the first aspect, the rotation adjustment device further includes a reset member, and the reset member is elastically abutted between the engaging member and the second adjustment member.

[0011] In one of the embodiments of the first aspect, the rotation adjustment device further includes an unlocking structure, and the unlocking structure is used to make the latch tooth disengage from the positioning groove.

[0012] In one embodiment of the first aspect, the unlocking structure includes a pull rope, one end of which is connected to the engaging member.

[0013] In one of the embodiments of the first aspect, the unlocking structure includes a pulley, which is provided on the second adjusting member, and the pull rope slides on the pulley.

[0014] In one embodiment of the first aspect, there are multiple pulleys.

[0015] A second aspect provides a cervical fixator, comprising:

[0016] A mandibular support bracket, wherein the mandibular support bracket is the first adjusting member;

[0017] a bracket, wherein the bracket is the second adjusting member;

[0018] The rotation adjustment device is the rotation adjustment device as described above, and the rotation adjustment device is arranged between the mandibular support bracket and the bracket so that the mandibular support bracket can rotate along the predetermined direction and be locked in the opposite direction of the predetermined direction.

[0019] In one of the embodiments of the second aspect, an airbag and an airbag button unit are provided on the bracket, and the airbag button unit is used to control the inflation and deflation of the airbag.

[0020] In one of the embodiments of the second aspect, the rotation adjustment device also includes an unlocking structure, which includes a pull rope and an unlocking button unit. The pull rope is arranged in the bracket, one end of the pull rope is connected to the engaging member, and the unlocking button unit is used to pull the pull rope under the action of an external force. The unlocking button unit is arranged at a position of the bracket close to the airbag button unit.

[0021] Compared with the prior art, the rotation adjustment device and cervical fixator provided by the present application have the following beneficial effects:

[0022] The rotation adjustment device of the present application has multiple ratchet teeth arranged at intervals on the peripheral side of the rotating member, and the ratchet teeth are arranged obliquely. When the latching teeth of the engaging member are engaged in the corresponding positioning grooves, the rotating member can be unidirectionally rotated and adjusted relative to the engaging member, and the reverse rotation of the rotating member is restricted, so that the first adjusting member and the second adjusting member are reversely locked, and the rotation adjustment and stable support functions are realized at the same time. In addition, at least two latching teeth are arranged in parallel and at intervals on the engaging member, and the at least two latching teeth are engaged with at least two positioning grooves on the ratchet teeth, which can make the engagement between the two more secure, especially in the case of reverse locking, it is not easy to cause the sliding tooth engagement failure, thereby improving the reliability of the rotation adjustment device.

[0023] The cervical vertebra fixator of the present application adopts the rotation adjustment device provided by the present application. The mandibular support bracket as the first adjustment member can be rotated in the direction of the human chin to fit the human chin. After being rotated and adjusted to a suitable position, the mandibular support bracket is reversely locked relative to the bracket. Moreover, since the engaging member in the rotation adjustment device adopts at least two engaging tooth structures and at least two positioning grooves to engage with each other, a stable engaging effect can be provided, so that the mandibular support bracket can play a stable supporting role for the human chin, thereby improving the performance of the cervical vertebra fixator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a cervical fixator provided in an embodiment of the present application;

[0026] Figure 2 An exploded structural diagram of a cervical fixator provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0028] Figure 4 A schematic diagram of the matching relationship between the rotating member and the engaging member provided in the embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of the unlock button unit provided in an embodiment of the present application.

[0030] Among them, the reference numerals in the figure are:

[0031] 1- Mandibular support;

[0032] 2-bracket; 20-mounting cavity; 21-slot; 22-air bag; 23-air bag; 24-deflation valve; 25-trachea;

[0033] 30-rotating member; 300-ratchet tooth; 3000-convex arc surface; 301-positioning groove;

[0034] 31-clamping member; 310-clamping tooth; 311-abutting portion; 312-positioning portion; 313-boss; 314-limiting block;

[0035] 32-reset member;

[0036] 330 - pull rope; 331 - pulley; 332 - unlock button unit; 3320 - button housing; 3321 - plug column; 3322 - button spring. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Please also read Figure 1 and Figure 2 , the rotation adjustment device provided in the embodiment of the present application is now described. The rotation adjustment device is arranged between the first adjustment member and the second adjustment member, and the first adjustment member rotates relative to the second adjustment member along a predetermined direction. Taking the cervical vertebra fixator as an example, the first adjustment member is the mandibular support bracket 1, and the second adjustment member is the bracket 2. When the cervical vertebra fixator is worn on the human neck, the mandibular support bracket 1 can rotate relative to the bracket 2 in the direction toward the human chin. The rotation adjustment device provided in the embodiment of the present application is arranged between the mandibular support bracket 1 and the bracket 2.

[0042] Of course, the rotation adjustment device provided in the embodiment of the present application is not limited to use in cervical fixators, but can also be used in devices or equipment that require rotation adjustment and reverse locking between other two components, such as adjustable tables, adjustable brackets or adjustable chairs, etc.

[0043] See also Figures 2 to 4 The rotation adjustment device includes a rotating member 30 disposed on the first adjustment member and a clamping member 31 disposed on the second adjustment member. The rotating member 30 is provided with ratchet teeth 300. A plurality of ratchet teeth 300 are arranged at intervals along the circumferential side surface of the rotating member 30. A positioning groove 301 is formed between two adjacent ratchet teeth 300. Each ratchet tooth 300 is arranged obliquely, and the inclination direction of the ratchet teeth 300 is opposite to the predetermined direction. The clamping member 31 is provided with a clamping tooth 310. At least two clamping teeth 310 are arranged in parallel and at intervals. Each clamping tooth 310 can be correspondingly inserted into one of the positioning grooves 301.

[0044] A plurality of ratchet teeth 300 are arranged at intervals on the side surface of the rotating member 30, and the ratchet teeth 300 are arranged at an angle. When the latching teeth 310 of the engaging member 31 are engaged in the corresponding positioning groove 301, the rotating member 30 can be unidirectionally rotated and adjusted relative to the engaging member 31, and the rotating member 30 is restricted from rotating in the reverse direction, so that the first adjusting member and the second adjusting member are reversely locked, thereby realizing the functions of rotation adjustment and reverse locking at the same time.

[0045] Compared with the prior art, the rotation adjustment device provided in the present application has at least two latching teeth 310 arranged in parallel and at intervals on the engaging member 31, and the at least two latching teeth 310 are engaged with at least two positioning grooves 301 on the ratchet teeth 300, which can make the engagement between the two more secure, especially in the case of reverse locking, and it is less likely to cause the engagement to fail due to slipping teeth, thereby improving the reliability of the rotation adjustment device.

[0046] In another embodiment of the present application, please refer to Figure 4, the distance between two adjacent latch teeth 310 is equal to the distance between two adjacent positioning grooves 301. That is, when the number of latch teeth 310 is two, the two latch teeth 310 are engaged with the corresponding two adjacent positioning grooves 301, and when the number of latch teeth 310 is three, the three latch teeth 310 are engaged with the corresponding three continuous positioning grooves 301, which can ensure the reliability of the engagement between the two and make the structure more compact.

[0047] In another embodiment of the present application, please continue to refer to Figure 4 The outer tooth surface of the ratchet tooth 300 is a convex arc surface 3000 , and the shape of the latch tooth 310 is matched with the shape of the positioning groove 301 .

[0048] When the rotating member 30 rotates in a predetermined direction, the convex arc surface 3000 of the ratchet tooth 300 pushes the latch tooth 310 away from the positioning groove 301 until it is out of the positioning groove 301. When the rotating member 30 rotates until the next positioning groove 301 of the ratchet tooth 300 is opposite to the latch tooth 310, the latch tooth 310 is reinserted into the next positioning groove 301. When the rotating member 30 wants to rotate in the reverse direction in the predetermined direction, the inner tooth surface of the ratchet tooth 300 abuts against the latch tooth 310, thereby limiting the rotating member 30 from rotating in the reverse direction.

[0049] In another embodiment of the present application, an angle is formed between the connecting line of the point where the inner tooth surface of the ratchet tooth 300 abuts against the latch tooth 310 and the rotation center point of the rotating member 30 and the axial direction of the engaging member 31, and the angle of the angle is 100° to 120°. Within this angle range, the inclination of the ratchet tooth 300 can engage with the latch tooth 310 in the opposite direction. If the angle is too large, the inclination of the ratchet tooth 300 is too large, which may cause the rotating member 30 to be unable to rotate in a predetermined direction, that is, bidirectional jamming; if the angle is too small, the inclination of the ratchet tooth 300 is too small, which may cause the reverse locking to be unable to be achieved, that is, both directions can be rotated. In this embodiment, the angle is 110°.

[0050] In another embodiment of the present application, please refer to Figure 3 to Figure 4 The rotation adjustment device further includes a reset member 32, and the reset member 32 elastically abuts between the engaging member 31 and the second adjustment member.

[0051] When the rotating member 30 rotates in a predetermined direction, the ratchet teeth 300 squeeze the latch teeth 310 to force the latch teeth 310 to exit the positioning groove 301, and the engaging member 31 squeezes the reset member 32. When the rotating member 30 rotates to the next positioning groove 301 and is opposite to the latch teeth 310, the elastic force of the reset member 32 drives the latch teeth 310 of the engaging member 31 to be inserted into the positioning groove 301, so that the engaging member 31 and the rotating member 30 are automatically locked and reset. At the same time, the reset member 32 can also ensure that the latch teeth 310 are stably inserted into the positioning groove 301, thereby improving the reliability of the locking fit between the rotating member 30 and the engaging member 31.

[0052] In another embodiment of the present application, please continue to refer to Figure 4 , the reset member 32 is a spring. The second adjusting member is provided with a mounting cavity 20 for accommodating the engaging member 31, and the mounting cavity 20 is provided with a first through hole. When the engaging member 31 is placed in the mounting cavity 20, the latching tooth 310 on the engaging member 31 can pass through the first through hole and be inserted into the positioning groove 301. The engaging member 31 includes an abutting portion 311, a positioning portion 312 and the latching tooth 310. The latching tooth 310, the abutting portion 311 and the positioning portion 312 are connected in sequence, and a protruding boss 313 is formed at the connection between the abutting portion 311 and the positioning portion 312. The positioning portion 312 is used for the reset member 32 to be sleeved. The reset member 32 is sleeved on the positioning portion 312, and the engaging member 31 is placed in the mounting cavity 20. One end of the reset member 32 abuts against the boss 313, and the other end of the reset member 32 abuts against the cavity wall of the mounting cavity 20.

[0053] In another embodiment of the present application, please refer to Figure 4 The limiting blocks 314 extend from both sides of the abutting portion 311 of the engaging member 31 toward the positioning portion 312 . When the reset member 32 is sleeved on the positioning portion 312 , the limiting blocks 314 abut against the outer side of the reset member 32 , limiting the reset member 32 from shifting randomly.

[0054] In another embodiment of the present application, please refer to Figures 2 to 4 The rotation adjustment device further includes an unlocking structure, which is used to disengage the latch 310 from the positioning groove 301. By disengaging the latch 310 from the positioning groove 301 through the unlocking structure, the reverse locking between the engaging member 31 and the rotating member 30 can be released, so that the rotating member 30 can rotate in the reverse direction.

[0055] In another embodiment of the present application, please continue to refer to Figures 2 to 4 The unlocking structure includes a pull rope 330, one end of which is connected to the engaging member 31. The engaging member 31 is pulled by the pull rope 330, so that the latching teeth 310 can be disengaged from the positioning groove 301. Combined with the use of the reset member 32, when the pull rope 330 is released, the engaging member 31 and the rotating member 30 automatically return to the reverse locking state.

[0056] In another embodiment of the present application, please continue to refer to Figures 2 to 4 The unlocking structure includes a pulley 331 , which is disposed on the second adjusting member, and the pull rope 330 slides on the pulley 331 .

[0057] The functions of setting the pulley 331 are as follows: first, the pulley 331 can limit the pull rope 330; second, the pulley 331 can also change the direction of the pull rope 330 according to actual needs, so that the pull rope 330 can be arranged along a specific path; third, the pulley 331 can make it easier to pull the pull rope 330.

[0058] In another embodiment of the present application, the number of pulleys 331 is several. The number of pulleys 331 can be determined according to the arrangement path of the pull rope 330 on the second adjustment member. If the arrangement path is long or there are many turns, the number of pulleys 331 can be increased accordingly. The pulleys 331 are arranged at the turns to change the direction of the pull rope 330, so as to ensure that the pull rope 330 can play a better limiting and guiding role. In the embodiment of the present application, the number of pulleys 331 is ten.

[0059] See also Figure 1 and Figure 2 The present application also provides a cervical vertebra fixator, which includes a mandibular support bracket 1, a bracket 2 and a rotation adjustment device, wherein the mandibular support bracket 1 is a first adjustment member, the bracket 2 is a second adjustment member, and the rotation adjustment device is a rotation adjustment device provided in an embodiment of the present application, and the rotation adjustment device is arranged between the mandibular support bracket 1 and the bracket 2 so that the mandibular support bracket 1 can rotate relative to the bracket 2 in a predetermined direction and be locked in the opposite direction of the predetermined direction.

[0060] The cervical vertebra fixator provided by the present application adopts the rotation adjustment device provided by the embodiment of the present application. The mandibular support bracket 1 as the first adjustment member can be rotated in the direction of the human chin to fit the human chin. After being rotated and adjusted to a suitable position, the mandibular support bracket 1 is reversely locked relative to the bracket 2. Moreover, since the engaging member 31 in the rotation adjustment device adopts at least two engaging teeth 310 structure and at least two positioning grooves 301 to engage with each other, a stable engaging effect can be provided, so that the mandibular support bracket 1 can provide a stable supporting effect on the human chin, thereby improving the performance of the cervical vertebra fixator.

[0061] In another embodiment of the present application, see Figure 2 and Figure 5 The unlocking structure includes a pull rope 330 and an unlocking button unit 332. The pull rope 330 is arranged in the bracket 2. One end of the pull rope 330 is connected to the engaging member 31. The unlocking button unit 332 is at least partially exposed on the surface of the bracket 2. The unlocking button unit 332 is used to pull the pull rope 330 under the action of an external force. The pull rope 330 is hidden in the bracket 2. The pulley 331 is installed in the bracket 2 to limit and guide the pull rope 330. The operator can apply force to the unlocking button unit 332 to pull the pull rope 330, thereby realizing the unlocking function.

[0062] In another embodiment of the present application, continue to refer to Figure 2 and Figure 5 The unlocking button unit 332 includes a button housing 3320, a slot 21 is provided on the bracket 2, and a plug post 3321 is provided on the button housing 3320. The plug post 3321 can be slidably inserted into the slot 21. The pull rope 330 passes through the end of the plug post 3321 close to the slot 21 (referred to as the bottom of the plug post 3321) and abuts against it, so that when the button housing 3320 is pressed, the plug post 3321 is inserted into the slot 21, and at the same time moves the pull rope 330 into the slot 21, thereby pulling the pull rope 330.

[0063] In another embodiment of the present application, continue to refer to Figure 2 and Figure 5 The unlocking button unit 332 also includes a button spring 3322, which abuts between the button housing 3320 and the bracket 2. The outer diameter of the button spring 3322 is larger than the inner diameter of the slot 21, and the inner diameter of the button spring 3322 is larger than the outer diameter of the plug post 3321, so that the button spring 3322 can be sleeved outside the plug post 3321, and the button spring 3322 can be restricted outside the slot 21. When the button housing 3320 is pressed, the plug post 3321 is inserted into the slot 21 and squeezes the button spring 3322 at the same time; when the button housing 3320 is released, the button spring 3322 releases its elastic force, so that the button housing 3320 can automatically reset.

[0064] It should be added that in the cervical fixator, when there is one rotating adjustment device, the rotating member 30 is arranged at one end of the mandibular support bracket 1, and the engaging member 31 is correspondingly arranged at one side of the bracket 2. At this time, one end of the pull rope 330 is fixedly connected to the engaging member 31, and the other end of the pull rope 330 can be fixed on the plug column 3321, or fixed on the bracket 2 after passing through the bottom of the plug column 3321, so as to ensure that the pull rope 330 can be pulled during the sliding process of the plug column 3321. When there are two rotating adjustment devices, the two rotating adjustment devices are respectively arranged on both sides of the cervical fixator. At this time, the two ends of the pull rope 330 are respectively fixedly connected to the engaging members 31 in the two rotating adjustment devices, and the pull rope 330 passes through the bottom of the plug column 3321 and abuts against it.

[0065] In another embodiment of the present application, in order to smoothly pull the pull rope 330 when the button housing 3320 is pressed, a pulley 331 with a certain height is provided at a position of the bracket 2 close to the slot 21, so that the pull rope 330 passes through the upper side of the pulley 331, and after the pull rope 330 passes through the pulley 331, the length direction of the pull rope 330 is consistent with the movement direction of the plug column 3321.

[0066] In another embodiment of the present application, please refer to Figure 1The bracket 2 is provided with an airbag 22 and an airbag button unit, and the airbag button unit is used to control the inflation and deflation of the airbag 22. The inflation fullness of the airbag 22 is controlled by the airbag button unit to be suitable for people of different body shapes and to facilitate wearing of the cervical fixator.

[0067] In another embodiment of the present application, please refer to Figure 1 The airbag button unit includes an airbag 23, an air release valve 24 and an air pipe 25. The air pipe 25 connects the air release valve 24 and the airbag 22. The airbag 22 is inflated by pressing the airbag 23, and the airbag 22 is deflated by pressing the air release valve 24.

[0068] In another embodiment of the present application, please continue to refer to Figure 1 The unlocking button unit 332 is arranged at a position close to the airbag button unit of the bracket 2. That is, the unlocking button unit 332 and the airbag button unit are both arranged in a certain area on the bracket 2, which is convenient for users to operate and makes the overall appearance of the cervical fixator neater.

[0069] In another embodiment of the present application, please continue to refer to Figure 1 The unlocking button unit 332 and the airbag button unit are both arranged at the front bottom of the bracket 2. That is, when the cervical fixator is worn on a human body, the front bottom of the bracket 2 is located near the chest of the human body, and the unlocking button unit 332 and the airbag button unit are both arranged at this position, so that the user can operate the buttons by hand.

[0070] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A rotation adjustment device, arranged between a first adjustment member and a second adjustment member, wherein the first adjustment member rotates relative to the second adjustment member in a predetermined direction, characterized in that: include: A rotating member disposed on the first adjusting member, the rotating member being provided with ratchet teeth, a plurality of ratchet teeth being arranged at intervals along the circumferential side surface of the rotating member, a positioning groove being formed between two adjacent ratchet teeth, each of the ratchet teeth being arranged obliquely, and the inclination direction of the ratchet teeth being opposite to the predetermined direction; The engaging member is arranged on the second adjusting member, and the engaging member is provided with a locking tooth. At least two locking teeth are arranged in parallel and at intervals, and each of the locking teeth can be correspondingly inserted into one of the positioning grooves.

2. The rotation adjustment device according to claim 1, characterized in that: The distance between two adjacent latch teeth is equal to the distance between two adjacent positioning grooves.

3. The rotation adjustment device according to claim 1, characterized in that: The rotation adjustment device further comprises a reset member, and the reset member elastically abuts between the engaging member and the second adjustment member.

4. The rotation adjustment device according to any one of claims 1 to 3, characterized in that: The rotation adjustment device further comprises an unlocking structure, and the unlocking structure is used to make the latching tooth disengage from the positioning groove.

5. The rotation adjustment device according to claim 4, characterized in that: The unlocking structure comprises a pull rope, one end of which is connected to the engaging member.

6. The rotation adjustment device according to claim 5, characterized in that: The unlocking structure comprises a pulley, which is arranged on the second adjusting member, and the pull rope slides on the pulley.

7. The rotation adjustment device according to claim 6, characterized in that: The number of the pulleys is several.

8. A cervical fixator, characterized in that: include: A mandibular support bracket, wherein the mandibular support bracket is the first adjusting member; a bracket, wherein the bracket is the second adjusting member; A rotation adjustment device, wherein the rotation adjustment device is the rotation adjustment device as described in any one of claims 1 to 7, and the rotation adjustment device is arranged between the mandibular support bracket and the bracket so that the mandibular support bracket can rotate along the predetermined direction and be locked in the opposite direction of the predetermined direction.

9. The cervical fixator according to claim 8, characterized in that: An airbag and an airbag button unit are arranged on the bracket, and the airbag button unit is used for controlling the inflation and deflation of the airbag.

10. The cervical fixator according to claim 9, characterized in that: The rotation adjustment device also includes an unlocking structure, which includes a pull rope and an unlocking button unit. The pull rope is arranged in the bracket, one end of the pull rope is connected to the locking member, and the unlocking button unit is used to pull the pull rope under the action of external force. The unlocking button unit is arranged at a position of the bracket close to the airbag button unit.

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