Interbody fusion cage positioning and fixing system

Abstract

The utility model provides an interbody fusion cage positioning and fixing system capable of enabling an inclined screw to be accurately driven into a fusion cage, and relates to the technical field of interbody fusion cage implantation. An interbody fusion cage positioning and fixing system comprises a support, a first positioning guide plate and a second positioning guide plate. The front end of the support is provided with a left clamping jaw and a right clamping jaw which are oppositely arranged to clamp and fix the fusion cage. The first positioning guide plate is arranged above the support and can be detachably connected with the support, the first positioning guide plate is provided with a first positioning face attached to the bone face of the implantation side of an upper vertebral body fusion cage of a patient, and a first fixing screw guide hole is formed in the first positioning guide plate. The second positioning guide plate is arranged below the support and can be detachably connected with the support, the second positioning guide plate is provided with a second positioning face attached to the bone face of the implantation side of the lower vertebral body fusion cage of the patient, and a second fixing screw guide hole is formed in the second positioning guide plate. The stability of the fusion cage can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to intervertebral fusion cage implantation technical field, and specifically is a kind of intervertebral fusion cage positioning and fixing system. BACKGROUND

[0002] Intervertebral disc degenerative disease is currently clinically common and tricky problem, and the purpose of intervertebral fusion surgery is to relieve compression in time, prevent further nerve damage, restore cervical curvature and maintain cervical mechanical balance. Currently, the intervertebral fusion cage on the market mainly uses two ways of screw-plate fixation or self-fixation.

[0003] One way of screw-plate fixation is to tilt a screw into the fusion cage to connect with the upper and lower vertebral bodies, such as the intervertebral fusion cage disclosed in publication No. CN204890261U. Since the space between the upper and lower discs is small, i.e. the thickness of the fusion cage is thin, the screw tilt angle is limited, and the screw can only be fixed on the vertebral endplate of the upper and lower vertebral bodies. The fixation strength of the fusion cage is not enough, and when the fusion cage shifts, the screw is mainly subjected to tension, which can easily cause the screw to back out, and the stability of the fusion cage is poor, which can easily shift backward and come out. Another way of screw-plate fixation is to provide a fixation plate on the rear side of the fusion cage, such as the cervical fusion cage with a fixation plate disclosed in publication No. CN207768566U and the self-stable spinal fusion fixation device disclosed in publication No. CN216628669U. This way can connect the fusion cage to the area with the maximum hardness in the middle of the upper and lower vertebral bodies through the fixation plate, and the stability of the fusion cage is better. However, this way makes the fusion cage implantation surgery more complex and increases the surgical wound. In addition, the thickness of the fixation plate in the above-mentioned way cannot be too thick, and the fixation plate will deform to a certain extent after being subjected to the backward extrusion force of the fusion cage for a long time, which changes the stress of the screw and gradually increases the pull-out component force of the screw in the axial direction. In the fusion cage surgery, the diameter and number of screws are limited, and are restricted by the strength of the cone, so there are limited ways to improve the pull-out resistance of the screw. With the deformation of the fusion cage, the screw can also be pulled out by damaging the vertebrae, which can cause the fusion cage to shift backward and come out.

[0004] Self-fixation is mainly achieved by cooperation between the fusion cage and the upper and lower vertebral bodies, such as the self-fixing lumbar fusion cage disclosed in publication No. CN215307058U, which includes a fusion cage body and a fixation insert. Although self-fixation can simplify the fusion cage implantation surgery steps, the stability of the fusion cage is usually poorer than that of the screw-plate fixation method due to the lack of connecting screws between the fusion cage and the vertebral body.

[0005] Overall, the current market intervertebral fusion cage uses nail plate fixation or self-fixing implantation treatment Although it can replace the diseased intervertebral disc, solve the problem of nerve compression and intervertebral disc wear and tear, but due to the current fixation method, the position of the fusion cage is prone to change and is prone to dislocation, which is easy to cause related complications, such as fusion cage subsidence, adjacent joint degeneration, difficulty in swallowing, and nail plate fixation requiring secondary surgery to remove, etc., resulting in psychological pressure and dissatisfaction with the treatment plan for patients, affecting the patient's life level.

[0006] In order to improve the anti-extrusion ability of the fusion cage and make the stability of the fusion cage better, as shown in Figure 1 The applicant designs a fixed scheme in which the first fixed screw 33 is obliquely driven into the first fixed screw 33 of the fusion cage 31 from the fusion cage implantation side of the upper vertebral body 2, and the second fixed screw 32 is obliquely driven into the second fixed screw 32 of the fusion cage 31 from the fusion cage implantation side of the lower vertebral body 1, so that the fusion cage is connected with the upper and lower vertebral bodies to form a whole. The first fixed screw 33 and the second fixed screw 32 of the scheme are not easy to exit, and the stability of the fusion cage is better, but since the screws are obliquely driven into the vertebral body and the fusion cage, not only is the position of the screw prone to deviation during driving, but also the fusion cage is prone to displacement during driving into the fusion cage., not only affects the implantation effect of the fusion cage, but also causes the connection position of the screw and the fusion cage to be inconsistent with the required position, affecting the fixation effect of the fusion cage. Practical new type content

[0007] The technical problem to be solved by the present application is to provide an intervertebral fusion cage positioning and fixing system which can accurately drive an inclined screw into a fusion cage.

[0008] The technical scheme adopted by the present application to solve the technical problem is: an intervertebral fusion cage positioning and fixing system, comprising a support, a first positioning guide plate and a second positioning guide plate;

[0009] The front end of the support is provided with a left clamping jaw and a right clamping jaw arranged oppositely to clamp and fix the fusion cage;

[0010] The first positioning guide plate is arranged above the support and can be detachably connected with the support, and the first positioning guide plate is provided with a first positioning surface matched with the fusion cage implantation side of the upper vertebral body of the patient, and the first positioning guide plate is provided with a first fixed screw guide hole;

[0011] The second positioning guide plate is arranged below the support and can be detachably connected with the support, and the second positioning guide plate is provided with a second positioning surface matched with the fusion cage implantation side of the lower vertebral body of the patient, and the second positioning guide plate is provided with a second fixed screw guide hole.

[0012] Further, one end of the left clamping jaw is fixedly connected with the support, and one end of the right clamping jaw is slidably connected with the support in the direction of approaching or moving away from the left clamping jaw, and the support is provided with a locking mechanism for locking the position of the right clamping jaw.

[0013] Further, the locking mechanism comprises a worm engaged with one end of the right clamping jaw for driving the right clamping jaw to slide in the direction of approaching or moving away from the left clamping jaw, and the worm is a self-locking worm.

[0014] Further, the support is further provided with a rotating handle extending rearward for driving the worm to rotate, and the other end of the rotating handle is engaged with a second bevel gear arranged at one end of the worm through a first bevel gear.

[0015] Further, the support is a box-shaped structure, and the worm, the first bevel gear and the second bevel gear are arranged in the box-shaped structure.

[0016] Further, the support is provided with a swing arm articulated with the support and rotatable up and down, and the other end of the swing arm forms a guide plate mounting end for detachably connecting with the first positioning guide plate and the second positioning guide plate, and the guide plate mounting end is provided with a structure for detachably connecting with the first positioning guide plate and the second positioning guide plate.

[0017] Further, the screwdriver universal head sleeve is provided with a handle connected with one side of the screwdriver universal head sleeve.

[0018] The beneficial effects of the present application are that the fusion device positioning and fixing system can ensure that the first fixing screw and the second fixing screw are accurately connected with the fusion device at the designed angle and position, and the stability of the fusion device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a fixed structure diagram of the fusion device;

[0020] Figure 2 is a structural schematic diagram of the present application;

[0021] Figure 3 is a three-dimensional schematic diagram of the present application;

[0022] Figure 4 is a schematic diagram of the present application in use;

[0023] The figure shows: lower vertebral body 1, upper vertebral body 2, fusion cage 31, second fixing screw 32, first fixing screw 33, anti-skid tooth 34, positioning and fixing tool 4, support 41, first positioning guide plate 42, second positioning guide plate 43, left clamping jaw 44, right clamping jaw 45, worm 46, rotating handle 47, swing arm 48, guide plate control handle 49, screwdriver universal head sleeve 50, first positioning surface 421, first fixing screw guide hole 422, second positioning surface 431, second fixing screw guide hole 432, first bevel gear 471, second bevel gear 461. DETAILED DESCRIPTION

[0024] The utility model is further illustrated below in combination with the drawings and examples.

[0025] In order to facilitate the first fixing screw and the second fixing screw to be driven into the vertebral body and accurately enter the fusion cage, the intervertebral fusion cage positioning and fixing system of the utility model comprises a support 41, a first positioning guide plate 42 and a second positioning guide plate 43. Figures 2 to 3 The front end of the support 41 is provided with a left clamping jaw 44 and a right clamping jaw 45 arranged oppositely to clamp and fix the fusion cage 31. The first positioning guide plate 42 is arranged above the support 41 and can be detachably connected with the support 41. The second positioning guide plate 43 is arranged below the support 41 and can be detachably connected with the support 41.

[0026] The first fixing screw guide hole 422 plays a role of guiding the first fixing screw 33 to enter the upper vertebral body. The specific position of the first fixing screw guide hole 422 is designed according to the position of the first fixing screw 33. The inner diameter of the first fixing screw guide hole 422 is generally equal to or smaller than the diameter of the first fixing screw. The second fixing screw guide hole 432 plays a role of guiding the second fixing screw 32 to enter the lower vertebral body. The specific position of the second fixing screw guide hole 432 is designed according to the position of the second fixing screw 32. The inner diameter of the second fixing screw guide hole 432 is generally equal to or smaller than the diameter of the second fixing screw.

[0027] The specific use process of the fusion cage positioning and fixing system is as follows: Figure 4As shown, when installing the first fixing screw 33, first, the first positioning guide plate 42 is installed on the support 41, then the cage is clamped and fixed by the left jaw 44 and the right jaw 45, and the first positioning surface 421 is attached to the bone surface of one side of the cage implanted in the upper vertebral body 2, so as to prevent the cage from being displaced when the first fixing screw is punched in, and then the first fixing screw is punched in and installed through the first fixing screw guide hole 422; when installing the second fixing screw 32, first, the second positioning guide plate 43 is installed on the support 41, then the cage is clamped and fixed by the left jaw 44 and the right jaw 45, and the second positioning surface 431 is attached to the bone surface of one side of the cage implanted in the upper vertebral body 2, so as to prevent the cage from being displaced when the second fixing screw is punched in, and then the second fixing screw is punched in and installed through the second fixing screw guide hole 432. The cage positioning and fixing system can ensure that the first fixing screw 33 and the second fixing screw 32 are accurately punched in and connected with the cage 31 at the designed angle and position, which is beneficial to the stability of the cage 31.

[0028] In addition, the first positioning guide plate 42 and the second positioning guide plate 43 are arranged in a detachable structure with the support, which not only facilitates the replacement of the corresponding positioning guide plate according to different patients, but also makes the positioning guide plate detachable, so that the cage positioning and fixing system can also be used for cage implantation.

[0029] The first positioning guide plate 42 and the second positioning guide plate 43 can be fitted according to the shape of the vertebral bone surface of the patient and then formed by 3D printing. The coverage area of the first positioning guide plate 42 and the second positioning guide plate 43 should be within the surgical opening window range. In the embodiment of the utility model, the size of the first positioning guide plate 42 and the second positioning guide plate 43 is 3cm*4cm.

[0030] In the utility model, the left jaw 44 and the right jaw 45 can be arranged in a structure with an opening that cannot be adjusted, that is, the left jaw 44 and the right jaw 45 are fixedly arranged on the support 41, and the distance (opening) between the left jaw 44 and the right jaw 45 is designed according to the width of the cage 31. Of course, the left jaw 44 and the right jaw 45 can also be arranged on the support 41 in a way that can be opened and closed, so as to flexibly adjust the opening between the left jaw 44 and the right jaw 45 according to the size of the cage. For example, one end of the left jaw 44 and / or one end of the right jaw 45 is hinged to the support, so that the left jaw 44 or the right jaw 45 can rotate around the hinge point to increase the distance between the other end of the left jaw 44 and the right jaw 45, thereby adjusting the opening. When the left jaw 44 and the right jaw 45 are arranged on the support 41 in a way that can be opened and closed, the left and right jaws can be fixed by using manpower or spring, screw and other locking mechanisms, so that the left and right jaws remain in a clamped state.

[0031] In the embodiment of the utility model,Figure 2 and Figure 3 As shown in the figure, the left clamping jaw 44 is fixedly connected with the bracket 41, and the right clamping jaw 45 is slidably connected with the bracket 41 in the direction of approaching or moving away from the left clamping jaw 44 through a sliding groove or sliding rail arranged on the bracket, and the bracket 41 is provided with a locking mechanism for locking the position of the right clamping jaw 45.

[0032] When it is needed to clamp the fusion cage, the right clamping jaw 45 is moved in the direction of approaching the left clamping jaw 44, so that the fusion cage is clamped. Since the right clamping jaw 45 is slidably arranged on the bracket 41, the clamping degree of the left and right clamping jaws can be adjusted by the moving distance of the right clamping jaw 45, so that the clamping degree of the fusion cage 31 can be flexibly controlled according to the actual situation, and the displacement of the fusion cage 31 during screw installation can be better ensured. When the position of the right clamping jaw 45 is adjusted, the position of the right clamping jaw 45 is locked and fixed through the locking mechanism, so that the left and right clamping jaws can be kept in the clamped state. The locking mechanism can be a screw, a bolt or a spring.

[0033] As shown in the figure, Figure 3 In the embodiment of the utility model, the locking mechanism includes a worm 46 engaged with one end of the right clamping jaw 45 for driving the right clamping jaw 45 to slide in the direction of approaching or moving away from the left clamping jaw 44, and the worm 46 is a self-locking worm. When it is needed to adjust the position of the right clamping jaw 45, the worm is rotated to make the right clamping jaw 45 slide. Since the worm 46 is a self-locking worm, when the right clamping jaw 45 is adjusted to the position, the right clamping jaw 45 engaged with the worm can be locked by using the self-locking property of the worm, so that the right clamping jaw 45 is prevented from being automatically displaced by external force, and the right clamping jaw can be locked without other operations, so that the operation is convenient.

[0034] In order to conveniently drive the worm to rotate, in the embodiment of the utility model, the bracket 41 is further provided with a rotating handle 47 extending rearward at one end for driving the worm 46 to rotate, and the other end of the rotating handle 47 is engaged with a second bevel gear 461 arranged at one end of the worm 46 through a first bevel gear 471.

[0035] The bracket can be various structures, and in the embodiment of the utility model, the bracket is a box type structure, and the worm 46, the first bevel gear and the second bevel gear are arranged in the box type structure. The size of the bracket box type structure in the embodiment of the utility model is 3*1.8*1.5cm.

[0036] As shown in the figure, Figure 3As shown, the bracket 41 is provided with a swing arm 48 with one end hinged thereto and capable of rotating up and down, and the other end of the swing arm 48 forms a guide plate mounting end for detachably connecting to the first positioning guide plate 42 and the second positioning guide plate 43, and the guide plate mounting end is provided with a structure for detachably connecting to the first positioning guide plate 42 and the second positioning guide plate 43, which structure can be a bolt hole, a plug slot or a tongue that cooperates with the guide plate, etc. When it is necessary to drive in the first fixing screw, the first positioning guide plate 42 is mounted on the guide plate mounting end of the swing arm 48, and the swing arm 48 is rotated upward to an appropriate position until the first positioning surface 421 of the first positioning guide plate 42 is in contact with the bone surface on one side of the fusion device of the upper vertebra 2; when it is necessary to drive in the second fixing screw, the first positioning guide plate 42 is removed, and the second positioning guide plate 43 is mounted on the guide plate mounting end of the swing arm 48, and the swing arm 48 is rotated downward to an appropriate position until the second positioning surface 431 of the second positioning guide plate 43 is in contact with the bone surface on one side of the fusion device of the lower vertebra. This structure is conducive to reducing the volume of the bracket, making it convenient to observe the condition of the fusion device during the operation, and the swing arm can be rotated to prevent it from interfering with the operation before the screw is implanted.

[0037] In order to facilitate the first positioning guide plate 42 and the second positioning guide plate 43 to better fit the bone surface of one side of the corresponding vertebral body where the fusion device is implanted, the first positioning guide plate 42 and the second positioning guide plate 43 are both provided with a guide plate control handle 49.

[0038] To facilitate the installation of fixing screws, Figure 4 As shown, the fusion device positioning and fixation system of the present invention is also equipped with a screwdriver universal head sleeve 50 with one end bent to one side in an L-shaped structure. The screwdriver universal head sleeve 50 can fit the screwdriver universal head into its inner cavity, thereby constraining the screwdriver universal head and making it convenient for the operator to screw the screwdriver horizontally. A handle 501 is provided on one side of the screwdriver universal head sleeve 50, and the screwdriver universal head sleeve 50 can be controlled by the handle 501, thereby making it convenient for the operator to screw the screwdriver.

Claims

1. An intervertebral cage positioning and fixation system, characterized by: The bracket (41), the first positioning guide plate (42) and the second positioning guide plate (43) are included. The front end of the bracket (41) is provided with a left clamping jaw (44) and a right clamping jaw (45) oppositely arranged to clamp and fix the fusion cage (31). The first positioning guide plate (42) is arranged above the bracket (41) and can be detachably connected with the bracket (41), the first positioning guide plate (42) is provided with a first positioning surface (421) matched with the upper vertebral body fusion cage implant side bone surface of the patient, and the first positioning guide plate (42) is provided with a first fixed screw guide hole (422). The second positioning guide plate (43) is arranged below the bracket (41) and can be detachably connected with the bracket (41), the second positioning guide plate (43) is provided with a second positioning surface (431) matched with the lower vertebral body fusion cage implant side bone surface of the patient, and the second positioning guide plate (43) is provided with a second fixed screw guide hole (432).

2. The intervertebral fusion cage positioning and fixation system as recited in claim 1, wherein: One end of the left clamping jaw (44) is fixedly connected with the bracket (41), one end of the right clamping jaw (45) is slidingly connected with the bracket (41) in the direction of approaching or moving away from the left clamping jaw (44), and the bracket (41) is provided with a locking mechanism for locking the position of the right clamping jaw (45).

3. The intervertebral fusion cage positioning and fixation system as recited in claim 2, wherein, The locking mechanism includes a worm (46) engaged with one end of the right clamping jaw (45) for driving the right clamping jaw (45) to slide in the direction of approaching or moving away from the left clamping jaw (44), and the worm (46) is a self-locking worm.

4. The intervertebral fusion cage positioning and fixation system of claim 3, wherein, The bracket (41) is also provided with a rotating handle (47) extending rearward at one end for driving the worm (46) to rotate, and the other end of the rotating handle (47) is engaged with a second bevel gear (461) arranged at one end of the worm (46) through a first bevel gear (471).

5. The intervertebral fusion cage positioning system of claim 4, wherein, The bracket (41) is a box-shaped structure, and the worm (46), the first bevel gear (471) and the second bevel gear (461) are arranged in the box-shaped structure.

6. The intervertebral fusion cage positioning system as recited in claim 1, wherein, The bracket (41) is provided with a swing arm (48) hingedly connected thereto and rotatable up and down at one end, the other end of the swing arm (48) forms a guide plate mounting end for detachable connection with the first positioning guide plate (42) and the second positioning guide plate (43), and the guide plate mounting end is provided with a structure for detachable connection with the first positioning guide plate (42) and the second positioning guide plate (43).

7. The intervertebral fusion cage positioning system as recited in claim 1, wherein, A screwdriver universal head sleeve (50) is also included, which is bent to an L-shaped structure at one end, and one side of the screwdriver universal head sleeve (50) is provided with a handle (501) connected therewith.

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