Cervical vertebra posterior single door controllable opening and fixing device

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a cervical posterior single-door controllable opening and fixing device which comprises an opening device and a limiting device. The spreader comprises a first spreading part and a second spreading part; the first distraction part is rotationally connected with the second distraction part; a first distraction groove is formed in the side wall of the first distraction part, and a second distraction groove is formed in the side wall of the second distraction part; the first distraction groove and the second distraction groove are matched with the limiting stopper. The vertebral plate distraction device has the advantages that the first distraction groove is formed in the side wall of the first distraction part, the second distraction groove is formed in the side wall of the second distraction part, after the vertebral plate is distraction, the first distraction groove and the second distraction groove give way for installation positions for the limiter, the distraction angle can be rapidly limited, and a specially-assigned person does not need to hold a pair of clamping forceps by hand to conduct manual bending for a long time; time and labor are saved, and the risk of vertebral plate fracture is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a controllable opening and fixing device for a posterior cervical vertebra with a single door. Background Art

[0002] Patients with cervical spinal stenosis have compressed spinal cords and may experience the following symptoms, such as numbness of both upper limbs, inability to complete fine movements, decreased muscle strength of both lower limbs, weakness and unsteady walking, and a sense of restraint in the chest, waist and abdomen. Such patients should undergo posterior cervical single-door surgery to decompress the cervical spinal canal. Posterior cervical single-door surgery is suitable for patients with severe cervical spinal stenosis, with a stenosis range of more than 3 segments (or even extensive degeneration and hyperplasia of the entire cervical spine and spinal cord compression). Ossification of the posterior longitudinal ligament of the cervical spine is continuous, mixed or discontinuous, with a wide range of involvement, requiring posterior decompression; calcification of the yellow ligament also requires posterior decompression.

[0003] In the posterior cervical single-door surgery, the doctor needs to bite off the lamina door on one side of the cervical spine, and safely and effectively lift and prop the door open, maintain the door position and reasonable spacing. At present, doctors generally use periosteal strippers and other instruments to perform this operation. This method is relatively cumbersome, and after propping, the opening angle cannot be quickly limited, and a dedicated person needs to hold the clamp for a long time to manually bend it. It is time-consuming and labor-intensive, and it also increases the risk of lamina fracture.

[0004] In view of the above problems, the utility model provides a controllable opening and fixing device for a single-door posterior cervical spine. Utility Model Content

[0005] In order to overcome the problems raised in the background technology, the utility model provides a controllable opening and fixing device for a single-door posterior cervical spine.

[0006] A controllable distraction and fixation device for a posterior single-door cervical spine, comprising a distractor and a limiter; the distractor comprises a first distractor portion and a second distractor portion; the first distractor portion is rotatably connected to the second distractor portion; a first distractor portion is provided on a side wall of the first distractor portion, and a second distractor portion is provided on a side wall of the second distractor portion; the first distractor portion and the second distractor portion are adapted to the limiter.

[0007] Furthermore, the first opening portion includes a first holding end, a first rotating frame and a first opening end; one side of the first rotating frame is connected to the first holding end, and the other end is connected to the first opening end.

[0008] Furthermore, the second opening portion includes a second holding end, a second rotating frame and a second opening end; one side of the second rotating frame is connected to the second holding end, and the other end of the second opening end is connected to the second holding end.

[0009] Furthermore, a first anti-slip structure is provided on a side of the first open end away from the second open end; and a second anti-slip structure is provided on a side of the second open end away from the first open end.

[0010] Furthermore, the first anti-slip structure includes a first toothed surface; and the second anti-slip structure includes a second toothed surface.

[0011] Furthermore, the first rotating frame is adapted to the second rotating frame so that the first support portion is rotatably connected to the second support portion.

[0012] Furthermore, the limiter includes an expansion structure and a fixed structure; the fixed structures are respectively arranged on both sides of the expansion structure; and the expansion structure and the fixed structure are fixedly connected.

[0013] Furthermore, there is an angle less than 180° between the expansion structure and the fixing structure.

[0014] Furthermore, a restoring portion is provided between the first opening portion and the second opening portion.

[0015] Furthermore, the reset portion includes a first reset arm and a second reset arm; one end of the first reset arm is connected to the second reset arm, and the other end is detachably connected to the first support portion; one end of the second reset arm away from the first reset arm is detachably connected to the second support portion.

[0016] The beneficial effects of the utility model include: a first expansion groove is arranged on the side wall of the first expansion part, and a second expansion groove is arranged on the side wall of the second expansion part; after the vertebral plate is expanded, the first expansion groove and the second expansion groove make way for the installation position of the limiter, which can quickly limit the opening angle without the need for a special person to hold the clamping pliers for a long time for manual bending; it saves time and effort, and also reduces the risk of vertebral plate fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a posterior vertebral single-door controllable distraction device for realizing the utility model;

[0018] Figure 2 It is a structural schematic diagram of a controllable opening device for a single-door posterior vertebral approach according to the utility model;

[0019] Figure 3 A front view of a first opening portion for implementing the utility model;

[0020] Figure 4 It is a structural schematic diagram of a first propping-opening part for implementing the utility model;

[0021] Figure 5 A front view of the second propping part of the utility model;

[0022] Figure 6 It is a structural schematic diagram of a second propping part for implementing the utility model;

[0023] Figure 7 It is a structural schematic diagram of a limiter for realizing the utility model;

[0024] Figure 8 A schematic diagram of a limiter for implementing the utility model during use;

[0025] In the figure, 1, first opening part; 2, second opening part; 3, reset part; 4, limiter; 11, first holding end; 12, first rotating frame; 13, first opening end; 14, first opening slot; 21, second holding end; 22, second rotating frame; 23, second opening end; 24, second opening slot; 31, first reset arm; 32, second reset arm; 41, opening structure; 42, fixing structure; 421, positioning hole; 111, first installation position. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The utility model can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0028] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] like Figure 1-7A controllable distraction and fixation device for a posterior cervical single-door is shown, which includes a distractor and a limiter 4; the distractor includes a first distraction part 1 and a second distraction part 2; the first distraction part 1 and the second distraction part 2 are rotatably connected; a first distraction groove 14 is provided on the side wall of the first distraction part 1, and a second distraction groove 24 is provided on the side wall of the second distraction part 2; the first distraction groove 14 and the second distraction groove 24 are adapted to the limiter 4.

[0030] A first expansion groove 14 is arranged on the side wall of the first expansion part 1, and a second expansion groove 24 is arranged on the side wall of the second expansion part 2. After the vertebral plate is expanded, the first expansion groove 14 and the second expansion groove 24 make way for the installation position of the limiter 4, which can quickly limit the opening angle without the need for a dedicated person to hold the clamp for a long time for manual bending. This saves time and effort and also reduces the risk of vertebral plate fracture.

[0031] Furthermore, a plurality of first opening slots 14 are arranged in a linear array on the side wall of the first opening portion 1. A plurality of second opening slots 24 are arranged in a linear array on the side wall of the second opening portion 2.

[0032] like Figure 2-6 As shown, the first opening portion 1 includes a first holding end 11, a first rotating frame 12 and a first opening end 13; one side of the first rotating frame 12 is connected to the first holding end 11, and the other end is connected to the first opening end 13. The first rotating frame 12 is rotatably connected to the second opening portion 2. There is an angle of less than 180° between the first holding end 11 and the first opening end 13.

[0033] The second opening portion 2 includes a second holding end 21, a second rotating frame 22 and a second opening end 23; one side of the second rotating frame 22 is connected to the second holding end 21, and the other end is connected to the second opening end 23. The second rotating frame 22 is rotatably connected to the first opening portion 1. There is an angle of less than 180° between the second holding end 21 and the second opening end 23.

[0034] Specifically, the first rotating frame 12 is adapted to the second rotating frame 22, so that the first opening portion 1 is rotatably connected to the second opening portion 2. Figure 1-2 It can be seen that when the first open end 13 and the second open end 23 are in contact with each other, an angle exists between the first holding end 11 and the second holding end 21 .

[0035] When in use, the first support end 13 and the second support end 23 are fitted and inserted into the interior of the lamina opening, and then the first holding end 11 and the second holding end 21 are pressed to open the first support end 13 and the second support end 23 to a certain angle, and then the limiter 4 is put into the first support groove 14 and the second support groove 24, and finally the two ends of the limiter 4 are respectively fixed on both sides of the lamina opening to limit the angle of the lamina opening (such as Figure 8 shown).

[0036] Furthermore, a first anti-slip structure is provided on the side of the first opening end 13 away from the second opening end 23, and a second anti-slip structure is provided on the side of the second opening end 23 away from the first opening end 13. This prevents the vertebral plate from slipping between the vertebral plate and the expander during the process of expanding the vertebral plate, thereby causing the vertebral plate to be impacted and causing nerve damage to the patient.

[0037] Specifically, the first anti-slip structure includes a first toothed surface; the second anti-slip structure includes a second toothed surface.

[0038] Alternatively, the first anti-slip structure includes first anti-slip grooves; and the second anti-slip structure includes second anti-slip grooves.

[0039] Although this embodiment only provides two solutions that can achieve the anti-slip effect, other solutions that can prevent sliding between the vertebral plate and the spreader can be derived by those skilled in the art based on this embodiment, which still do not deviate from the spirit and scope of the present invention.

[0040] like Figure 1-7 As shown, the stopper 4 includes an expansion structure 41 and a fixing structure 42; the fixing structures 42 are respectively arranged on both sides of the expansion structure 41; the expansion structure 41 is fixedly connected to the fixing structure 42. A positioning hole 421 is arranged inside the fixing structure 42. When in use, the bolt passes through the positioning hole 421 and is fixed on the vertebral body, so that the stopper 4 can be installed on the vertebral body.

[0041] Specifically, there is an angle of less than 180° between the expansion structure 41 and the fixing structure 42 , so that the fixing structure 42 fits on the surface of the vertebral body.

[0042] like Figure 1-7 As shown, a reset portion 3 is provided between the first opening portion 1 and the second opening portion 2. The reset portion 3 has a certain elasticity, and when the first holding end 11 and the second holding end 21 are pressed to open the first opening end 13 and the second opening end 23, the reset portion 3 is compressed. After the first holding end 11 and the second holding end 21 are released, the reset portion 3 wants to restore its original shape, driving the first holding end 11 and the second holding end 21 to open, so that the first opening end 13 and the second opening end 23 are merged.

[0043] Specifically, the reset portion 3 includes a first reset arm 31 and a second reset arm 32; one end of the first reset arm 31 is connected to the second reset arm 32, and the other end is detachably connected to the first support portion 1; the end of the second reset arm away from the first reset arm 31 is detachably connected to the second support portion 2.

[0044] A first mounting position 111 is provided on a side of the first holding end 11 facing the second holding end 21, and a second mounting position (not shown in the figure) is provided on a side of the second holding end 21 facing the first holding end 11. The first mounting position 111 is symmetrically arranged with the second mounting position. One end of the first reset arm 31 is fixed on the first mounting position 111. One end of the second reset arm 32 is fixed on the second mounting position.

[0045] Specifically, the first installation position 111 and the second installation position are both threaded holes. A screw passes through the first reset arm 31 or the second reset arm 32 and is screwed into the threaded hole, thereby fixing the reset portion 3 between the first open portion 1 and the second open portion 2 .

[0046] The method of using this embodiment is as follows:

[0047] 1. Fit the first support end 13 and the second support end 23 together and insert them into the interior of the lamina opening;

[0048] 2. Press the first holding end 11 and the second holding end 21 to open the first support end 13 and the second support end 23 to a certain angle;

[0049] 3. Place the stopper 4 into the first support groove 14 and the second support groove 24;

[0050] 4. Fix the two ends of the limiter 4 on the two sides of the lamina opening to limit the angle of the lamina opening.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The embodiments described in this application are only part of the embodiments of the utility model, not all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A controllable opening and fixing device for a single-door posterior cervical spine, comprising an opener and a limiter, characterized in that: The expander includes a first expander portion and a second expander portion; the first expander portion and the second expander portion are rotatably connected; a first expander groove is arranged on the side wall of the first expander portion, and a second expander groove is arranged on the side wall of the second expander portion; the first expander groove and the second expander groove are adapted to the limiter.

2. A posterior cervical single-door controllable distraction and fixation device according to claim 1, characterized in that: The first opening portion includes a first holding end, a first rotating frame and a first opening end; one side of the first rotating frame is connected to the first holding end, and the other end of the first opening end is connected to the first holding end.

3. A posterior cervical vertebra single-door controllable distraction and fixation device according to claim 2, characterized in that: The second opening portion includes a second holding end, a second rotating frame and a second opening end; one side of the second rotating frame is connected to the second holding end, and the other end of the second rotating frame is connected to the second opening end.

4. A posterior cervical vertebra single-door controllable distraction and fixation device according to claim 3, characterized in that: A first anti-slip structure is disposed on a side of the first open end away from the second open end; and a second anti-slip structure is disposed on a side of the second open end away from the first open end.

5. A posterior cervical single-door controllable distraction and fixation device according to claim 4, characterized in that: The first anti-slip structure includes a first toothed surface; the second anti-slip structure includes a second toothed surface.

6. The posterior cervical vertebra single-door controllable distraction and fixation device according to claim 3, characterized in that: The first rotating frame is adapted to the second rotating frame so that the first support portion is rotatably connected to the second support portion.

7. The posterior cervical vertebra single-door controllable distraction and fixation device according to claim 1, characterized in that: The limiter comprises an expansion structure and a fixed structure; the fixed structures are respectively arranged on both sides of the expansion structure; the expansion structure and the fixed structure are fixedly connected.

8. The posterior cervical vertebra single-door controllable distraction and fixation device according to claim 7, characterized in that: There is an angle of less than 180° between the expansion structure and the fixing structure.

9. The posterior cervical vertebra single-door controllable distraction and fixation device according to claim 1, characterized in that: A restoring portion is provided between the first opening portion and the second opening portion.

10. A posterior cervical vertebra single-door controllable distraction and fixation device according to claim 9, characterized in that: The reset portion includes a first reset arm and a second reset arm; one end of the first reset arm is connected to the second reset arm, and the other end is detachably connected to the first support portion; the second reset arm is detachably connected to the second support portion at one end away from the first reset arm.

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