A skull base depression reduction device

Abstract

The present application relates to a kind of skull base depression reset device, including operating lever, first movable arm and second movable arm, operating lever front end is equipped with the support arm of support connecting rod, support arm is equipped with connecting rod, first movable arm is movably connected with connecting rod, first movable arm end is equipped with the clamping hook that is engaged with reset clamping hook, move forward and backward by first movable arm to drive clamping hook, to drive skull distraction reset or shortening reset;Second movable arm is movably connected with support arm by adjusting rod, and the lower end of second movable arm is clamped on first movable arm by pusher, and first movable arm is rotated around connecting rod arc, to drive skull reset by moving pusher downwards, so that;Connecting rod and adjusting rod can be rotated around support arm, to adapt when support arm supports left and right connecting rod, skull can be reset by reset device. The present application effectively solves the problems of insufficient reset force, complex reset operation and the like, improves the reset effect of skull base depression, and improves the work efficiency of medical staff.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a skull base depression reduction device. BACKGROUND

[0002] For skull base depression, the odontoid process often shifts upward and backward into the intracranial, compressing the spinal cord and causing limb numbness and weakness. The purpose of the skull base depression reduction surgery is to pull the odontoid process down and move it forward at the same time, so that the spinal cord will no longer be compressed, the odontoid process will be best reduced, and the surgery will achieve the best effect. Currently, skull traction, an assistant stretching the head, increasing the curvature of the connecting rod, and distracting between the cervical spine screw and the occipital fixation plate are commonly used in clinical practice to achieve reduction, but due to the limited force, and the multiple reduction methods are mostly one-way force, often unable to consider multiple directions, resulting in complex and difficult reduction process, general reduction effect, and the surgical effect cannot meet the patient's reduction needs, and the reason is that there is a lack of effective reduction tools. SUMMARY

[0003] In view of the existing problems, the present application provides a skull base depression reduction device, which effectively solves the problems of insufficient reduction force, complex and difficult reduction operation in the prior art, effectively improves the reduction effect of skull base depression, and improves the work efficiency of medical staff.

[0004] The technical scheme of the present application is as follows:

[0005] A skull base depression reduction device, comprising an operating rod, a first movable arm and a second movable arm, the end of the operating rod is provided with a handle, the front end of the operating rod is fixedly provided with a support arm, the support arm is used for supporting the connecting rod at the pedicle screw; a connecting rod is arranged on the support arm, the first movable arm is movably connected with the connecting rod, the end of the first movable arm is provided with a hook for clamping with a reduction hook on an occipital fixation plate, the hook is moved forward and backward by the first movable arm to drive the occipital fixation plate together with the skull to be distracted or shortened; the second movable arm is movably connected with the support arm through an adjusting rod, the lower end of the second movable arm is provided with a pushing part, and the pushing part is clamped on the first movable arm; the pushing part is moved downward by the second movable arm to drive the first movable arm to rotate in an arc line around the connecting rod, so as to drive the skull to be rotated backward for reduction.

[0006] The connecting rod and the adjusting rod can be rotated around the support arm to adapt to the situation that the support arm supports the connecting rod at the left and right pedicle screws, and the skull can be reduced by the second movable arm and the first movable arm.

[0007] Preferably, the end of the hook is provided with a groove, and the groove is engaged with the bottom of the repositioning hook on the occipital fixation plate.

[0008] Preferably, the first movable arm includes a first movable structure, a first limiting sleeve, and a collar. The first limiting sleeve is movably sleeved on the outside of the first movable structure, and the collar is disposed on the first limiting sleeve. The end of the first limiting sleeve near the pushing part is provided with a second limiting member for preventing the second movable arm from sliding down.

[0009] Preferably, the connecting rod is movably sleeved on the support arm via a first sleeve; the collar is movably sleeved on the connecting rod so that the first movable arm can move left and right on the connecting rod, and can also rotate around the arc of the connecting rod; the end of the connecting rod away from the support arm is provided with a first limiting member for preventing the collar from slipping out, and the first limiting member is detachable.

[0010] Preferably, the second movable arm includes a second movable structure and a second limiting sleeve, the second limiting sleeve being sleeved on the outside of the second movable structure, and the pushing part being located at the lower end of the second movable structure; the pushing part is an inverted U-shaped bayonet, and the bayonet of the pushing part acts on the first limiting sleeve of the first movable arm.

[0011] Preferably, the adjusting rod is a polygonal long rod, which includes an adjusting main rod and an adjusting support rod. One end of the adjusting main rod is movably sleeved on the second movable arm through a second sleeve, and the other end is movably sleeved on the outside of the adjusting support rod. The end of the adjusting support rod away from the adjusting main rod is movably sleeved on the support arm through a third sleeve, so as to adjust the second movable arm to engage with the first movable arm at different positions, and the adjusting support rod is fixed in the adjusting main rod by a first limiting screw.

[0012] Preferably, both the first movable structure and the second movable structure include a movable rod and a connecting rod. One end of the connecting rod has a groove, and one end of the movable rod has a protrusion. The groove and the protrusion cooperate to movably connect the connecting rod and the movable rod. The end of the movable rod away from the protrusion has a nut. The nut drives the movable rod to engage with the first limiting sleeve or the second limiting sleeve through a threaded connection, thereby driving the connecting rod to move together with the hook or the pushing part.

[0013] Preferably, both the first limiting sleeve and the second limiting sleeve are provided with an observation port and a scale for observing the movement distance of the movable rod, and both are provided with a second limiting screw in the observation port. The connecting rod is provided with at least one through hole evenly, through which the second limiting screw passes, and the observation port restricts the second limiting screw to limit the rotation of the connecting rod within the first limiting sleeve or the second limiting sleeve.

[0014] Preferably, the front end of the operating lever is vertically downward; and an angle α is formed between the front end of the operating lever and the handle at the end of the operating lever, wherein the value of the angle α is in the range of 45° to 180°.

[0015] Preferably, the lower end of the support arm is provided with a support portion for fitting around the outside of the pedicle screw. The support portion has at least two openings, and the two openings communicate with the U-shaped groove of the pedicle screw. The connecting rod passes through the U-shaped groove of the pedicle screw and the two openings of the support portion so that the connecting rod is engaged at the lower end of the support arm.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The repositioning device of this invention uses a first movable arm to move the hook back and forth, thereby causing the occipital fixation plate and skull to be opened and repositioned or shortened back into place. The repositioning can be flexibly adjusted according to the surgical situation, improving the practicality of the device and enhancing the repositioning effect of basilar indentation. A second movable arm moves the pushing part downwards, causing the first movable arm to rotate around the connecting rod arc, thus causing the skull to rotate backwards and reposition. This backward rotation results in upward and backward displacement of the skull base, i.e., downward and anterior displacement of the odontoid process of the axis vertebra. This further solves the problems of insufficient repositioning force and complex and difficult repositioning operations in existing technologies, effectively improving the repositioning effect of basilar indentation and increasing the work efficiency of medical staff. Both the connecting rod and the adjusting rod can rotate around the support arm to accommodate situations where the support arm supports the connecting rods at the left and right pedicle screws. In both cases, the second and first movable arms can drive the skull to reposition, improving the applicability of the device and making it easy to operate, thereby increasing the work efficiency of medical staff. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an axial view of the skull base depression reduction device of the present invention;

[0020] Figure 2 This is a schematic diagram of the skull base depression reduction device of the present invention driving the occipital fixation plate to reduce its position.

[0021] Figure 3 This is a detailed schematic diagram of the first movable arm in the skull base depression reduction device of the present invention;

[0022] Figure 4 This is a detailed schematic diagram of the second movable arm in the skull base depression reduction device of the present invention;

[0023] Figure 5 This is a detailed schematic diagram of C1 in the first movable arm and C2 in the second movable arm of the present invention;

[0024] Figure 6 This is a detailed schematic diagram of the adjusting rod in the skull base depression reduction device of the present invention;

[0025] Figure 7 This is a schematic diagram of the support arm in the skull base depression reduction device of the present invention;

[0026] Figure 8 This is a detailed schematic diagram of point A in the skull base depression reduction device of the present invention.

[0027] Attached image labels:

[0028] 1. Operating lever; 2. Support arm; 21. Support part; 211. Opening; 22. Connecting rod; 3. First movable arm; 31. Hook; 311. Slot; 32. First movable structure; 33. First limiting sleeve; 34. First limiting component; 35. Collar; 36. Second limiting component; 4. Second movable arm; 41. Pushing part; 42. Second movable structure; 43. Second limiting sleeve; 5. Handle; 61. Adjusting rod; 611. Adjusting main rod; 612. Adjusting support rod; 613. First limiting screw; 7. Movable rod; 71. Protrusion; 72. Nut; 73. Observation port; 74. Scale; 75. Second limiting screw; 8. Connecting rod; 81. Groove; 82. Through hole; 91. First sleeve; 92. Second sleeve; 93. Third sleeve; 10. Reset hook; 20. Connecting rod; 30. Pedicle screw. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figures 1 to 8 The diagram shows a skull base depression reduction device provided by the present invention, comprising an operating rod 1, a first movable arm 3, and a second movable arm 4. The operating rod 1 has a handle 5 at its end and a support arm 2 fixedly at its front end. The support arm 2 supports the connecting rods 20 at the pedicle screws 30 of the left and right cervical vertebrae. A connecting rod 22 is provided on the support arm 2. The first movable arm 3 is movably connected to the connecting rod 22. The end of the first movable arm 3 has a hook 31 for engaging with a reduction hook 10 on the occipital fixation plate. The first movable arm 3 drives the hook 31 to move back and forth, thereby causing the occipital fixation plate and skull to be opened and reduced or shortened back into place. The second movable arm 4 is movably connected to the support arm 2 via an adjusting rod 61. The lower end of the second movable arm 4 has a pushing part 41, which is engaged with the first movable arm 3. The second movable arm 4 drives the pushing part 41 to move downwards, thereby causing the first movable arm 3 to rotate around the connecting rod 22, thus causing the skull to be posteriorly rotated and reduced.

[0033] Both the connecting rod 22 and the adjusting rod 61 can rotate around the support arm 2 to adapt to the fact that when the support arm 2 supports the left and right connecting rods 20, the skull can be repositioned through the second movable arm 4 and the first movable arm 3.

[0034] For occipital fixation plates, they are used to fix the skull to the patient's skull to assist in the reduction of basilar impression using a reduction device. Figure 2As shown, the occipital fixation plate includes a central plate and lateral branch plates symmetrically distributed on both sides of the central plate. The reduction hook 10 is located on the central plate of the occipital fixation plate, and the connecting rod 20 is set on the lateral branch plates on both sides of the occipital fixation plate. Two pedicle screws 30 are respectively sleeved on the connecting rods 20 on the left and right sides, and the pedicle screws 30 are fixed to the cervical vertebrae. For the reduction device, the support arm 2 at the front end of its operating rod 1 is used to support the connecting rods 20 at the pedicle screws 30 on the left and right sides of the cervical vertebrae. The hook 31 at the end of its first movable arm 3 is used to engage with the reduction hook 10 on the occipital fixation plate. Through the cooperation of the first movable arm 3 and the second movable arm 4, the occipital fixation plate and the skull are driven to open and reduce, shorten and return to their original position, or rotate and reduce.

[0035] Specifically, in this embodiment, the end of the operating lever 1 is provided with a handle 5, the support arm 2 is fixedly provided at the front end of the operating lever 1, the support arm 2 is provided with a connecting rod 22, and the end of the connecting rod 22 away from the support arm 2 extends forward; the first movable arm 3 is fixedly provided with a collar 35, which is movably sleeved on the extension of the connecting rod 22, so that the first movable arm 3 is movably connected to the connecting rod 22, and can move left and right on the connecting rod 22, and can also rotate around the arc of the connecting rod 22;

[0036] The other end of the connecting rod 22 extends forward by no less than 1.5 cm, so that when the support arm 2 is supported on the connecting rod 20 at the cervical pedicle screw 30, the first movable arm 3 can move left and right along the extended length of the connecting rod 22. This allows for flexible adjustment so that the first movable arm 3 can be aligned with the reduction hook 10 of the occipital fixation plate, further adapting to the reduction of different patients and improving the practicality of the reduction device. The hook 31 is located at the end of the first movable arm 3. The first movable arm 3 can drive the hook 31 to move left and right. When the support arm 2 supports the connecting rod 20 and the hook 31 moves to engage with the reduction hook 10 of the occipital fixation plate, the first movable arm 3 can drive the hook 31 to move back and forth. During this process, the hook 31 cooperates with the reduction hook 10 to drive the occipital fixation plate and the skull to be opened and reduced or shortened back into place. Therefore, during the reduction surgery, the first movable arm 3 can be adjusted in time according to the reduction situation to drive the occipital fixation plate and the skull to be opened and reduced or shortened back into place, thereby achieving the best reduction effect.

[0037] The lower end of the second movable arm 4 is provided with a pushing part 41, which is engaged with the first movable arm 3 to provide a downward pushing force to the first movable arm 3. When the support arm 2 supports the connecting rod 20, the first movable arm 3 is adjusted to the position along the extension length of the connecting rod 22, and the hook 31 at its end engages with the repositioning hook 10 of the occipital fixation plate, the second movable arm 4 drives the pushing part 41 to move downward, so that the pushing part 41 provides a downward pushing force to the first movable arm 3. At this time, the first movable arm 3 rotates around the arc of the connecting rod 22. During this process, the hook 31 cooperates with the repositioning hook 10 to drive the occipital fixation plate and the skull to rotate backward and reposition. The backward rotation of the skull results in the upward and backward movement of the skull base, that is, the downward and forward movement of the odontoid process of the axis, further realizing the repositioning of the skull base depression.

[0038] A first sleeve 91 is provided at a height slightly below the support arm 2, and the first sleeve 91 can rotate around the support arm 2 at this height position, i.e. Figure 8 As shown, the height position does not change during rotation; and the connecting rod 22 is located on the first sleeve 91. Therefore, the connecting rod 22 is movably sleeved on the support arm 2 through the first sleeve 91, that is, the connecting rod 22 can rotate around the support arm 2 at this height position; and since the first movable arm 3 is movably connected to the connecting rod 22, when the support arm 2 supports the connecting rod 20 at the left pedicle screw 30, the connecting rod 22 carries the first movable arm 3 to rotate around the support arm 2 to the right side of the support arm 2, so that the hook 31 can engage with the reduction hook 10 on the occipital fixation plate to perform reduction of the skull base depression; when the support arm 2 supports the connecting rod 20 at the right pedicle screw 30, the connecting rod 22 carries the first movable arm 3 to rotate around the support arm 2 to the left side of the support arm 2, so that the hook 31 can engage with the reduction hook 10 on the occipital fixation plate to perform reduction of the skull base depression;

[0039] Due to different patients, the position of the first movable arm 3 on the connecting rod 22 needs to be adjusted before or during the reduction surgery. Since the second movable arm 4 acts on the first movable arm 3 through the pushing part 41, the position of the second movable arm 4 in the reduction device should be adjusted as the position of the first movable arm 3 changes. Therefore, an adjusting rod 61 is provided between the support arm 2 and the second movable arm 4, and the second movable arm 4 is kept locked on the first movable arm 3 by adjusting the rod 61.

[0040] Specifically, such as Figure 6 As shown, the adjusting rod 61 includes an adjusting main rod 611 and an adjusting support rod 612. A second sleeve 92 is provided on the second movable arm 4, and the second sleeve 92 can rotate around the second movable arm 4 at this height position, i.e. Figure 8As shown, during rotation, the height of the second sleeve 92 remains unchanged; and one end of the adjusting main rod 611 is located on the second sleeve 92. Therefore, one end of the adjusting main rod 611 is movably sleeved on the second movable arm 4 through the second sleeve 92, meaning that one end of the adjusting main rod 611 can rotate around the second movable arm 4 without changing its height. The other end of the adjusting main rod 611 is movably sleeved on the outside of the adjusting support rod 612, thus allowing adjustment of the length of the adjusting support rod 612 within the adjusting main rod 611. A third sleeve 93 is positioned at a height slightly above the support arm 2, and the third sleeve 93 can rotate around the support arm 2 at this height position, i.e., as shown... Figure 8 As shown, the height position of the third sleeve 93 does not change during rotation; and the end of the adjusting rod 612 away from the adjusting main rod 611 is located on the third sleeve 93. Therefore, the adjusting rod 612 is movably sleeved on the support arm 2 through the third sleeve 93, that is, the adjusting rod 612 can rotate around the support arm 2 and its height position does not change.

[0041] The second movable arm 4 is adjusted by rotating one end of the main rod 611 around the second movable arm 4, adjusting the support rod 612 around the support arm 2, and adjusting the length of the support rod 612 extending into the main rod 611. This allows the second movable arm 4 to be engaged with the first movable arm 3 at different positions. After the second movable arm 4 is adjusted to the correct position, the first limiting screw 613 at the end of the main rod 611 is tightened to fix the support rod 612 in the main rod 611. At this time, the second movable arm 4 can be adjusted to drive the first movable arm 3 to perform a reset operation.

[0042] Further improvements are made in, such as Figure 3 As shown, the end of the hook 31 is provided with a groove 311. The groove of the groove 311 matches the repositioning hook 10 on the occipital fixation plate. Therefore, the hook 31 can be precisely engaged with the bottom of the repositioning hook 10 through the groove of the groove 311, thereby improving the fit between the hook 31 and the repositioning hook 10. During the repositioning operation, it can be adjusted in time according to the repositioning situation, thereby effectively driving the occipital fixation plate together with the skull to open and reposition, shorten and return to its original position, or rotate back to reposition, thereby improving the repositioning effect.

[0043] Further improvements are made in, such as Figure 3 As shown, the first movable arm 3 includes a first movable structure 32, a first limiting sleeve 33, and a collar 35. The first limiting sleeve 33 is a hollow structure and is movably sleeved on the outside of the first movable structure 32. The collar 35 is disposed on the first limiting sleeve 33. The first limiting sleeve 33 is movably sleeved on the connecting rod 22 through the collar 35 so that the first movable arm 3 is movably connected to the connecting rod 22. Therefore, the first movable arm 3 can move left and right on the connecting rod 22 and can rotate around the connecting rod 22.

[0044] A further improvement is that, since the second movable arm 4 may slide out of the front end of the first movable arm 3 when the second movable arm 4 drives the pushing part 41 to push the first movable arm 3 to rotate around the connecting rod 22, in order to prevent the second movable arm 4 from sliding down during the pushing process, a second limiting member 36 is provided at one end of the first limiting sleeve 33 near the pushing part 41, and the second limiting member 36 is sleeved on the outside of the first limiting sleeve 33.

[0045] Specifically, the first movable structure 32 includes a movable rod 7 and a connecting rod 8. A first limiting sleeve 33 is movably sleeved on the outside of the movable rod 7 and the connecting rod 8. The movable rod 7 has a thread that matches the thread on the inner wall of the first limiting sleeve 33, thus allowing the movable rod 7 to screw in or out of the first limiting sleeve 33 via the thread. Figure 5 As shown, one end of the movable rod 7 has a protrusion 71, and one end of the connecting rod 8 has a groove 81. The groove 81 and the protrusion 71 cooperate to make the connecting rod 8 and the movable rod 7 movably connected. That is, the movable rod 7 can drive the connecting rod 8 to move back and forth in the first limiting sleeve 33. The end of the movable rod 7 away from the protrusion 71 has a nut 72. The end of the connecting rod 8 of the first movable structure 32 away from the groove 81 is connected to the hook 31. Therefore, by rotating the nut 72, the movable rod 7 can be driven to screw in or out in the first limiting sleeve 33, thereby driving the connecting rod 8 together with the hook 31 to move back and forth. At this time, the occipital fixation plate together with the skull is opened and reset or shortened back into position.

[0046] A further improvement is that, when the first movable arm 3 moves left and right on the connecting rod 22 via the collar 35, in order to prevent the collar 35 from slipping off the connecting rod 22, a first limiting member 34 is provided at the end of the connecting rod 22 away from the support arm 2. Figure 1 As shown, in this embodiment, the first limiting member 34 is a screw, and a screw through hole is provided at the end of the connecting rod 22 away from the support arm 2. The screw is detachably inserted into the screw through hole so that the first movable arm 3 can be flexibly removed from the connecting rod 22 while preventing the collar 35 from slipping out of the connecting rod 22.

[0047] Further improvements are made in, such as Figure 4 As shown, the second movable arm 4 includes a second movable structure 42 and a second limiting sleeve 43. The second limiting sleeve 43 is a hollow structure and is sleeved on the outside of the second movable structure 42. The pushing part 41 is located at the lower end of the second movable structure 42. The pushing part 41 is an inverted U-shaped bayonet. The bayonet of the pushing part 41 acts on the first limiting sleeve 33 of the first movable arm 3, and the arc-shaped concave surface at its bayonet matches the first limiting sleeve 33, so that the second movable arm 4 can better act on the first movable arm 3, thereby more effectively improving the reduction effect of the skull base depression.

[0048] Specifically, the second movable structure 42 includes a movable rod 7 and a connecting rod 8. A second limiting sleeve 43 is movably sleeved on the outside of the movable rod 7 and the connecting rod 8. The movable rod 7 has threads that match the threads on the inner wall of the second limiting sleeve 43, thus allowing the movable rod 7 to screw in or out of the second limiting sleeve 43 via these threads. Figure 5 As shown, one end of the movable rod 7 has a protrusion 71, and one end of the connecting rod 8 has a groove 81. The groove 81 and the protrusion 71 cooperate to make the connecting rod 8 and the movable rod 7 movably connected, that is, the movable rod 7 can drive the connecting rod 8 to move up and down in the second limiting sleeve 43. The end of the movable rod 7 away from the protrusion 71 has a nut 72. The end of the connecting rod 8 of the second movable structure 42 away from the groove 81 is connected to the pushing part 41. Therefore, by rotating the nut 72, the movable rod 7 can be driven to screw in or out in the second limiting sleeve 43, thereby driving the connecting rod 8 together with the pushing part 41 to move up and down. When the pushing part 41 moves downward, the first movable arm 3 rotates around the arc of the connecting rod 22. During this process, the hook 31 at the front end of the first movable arm 3 cooperates with the repositioning hook 10 of the occipital fixation plate to drive the occipital fixation plate together with the skull to rotate back and reposition.

[0049] A further improvement is that the adjusting rod 61 is a polygonal long rod. In this embodiment, the adjusting rod 61 is a hexagonal long rod, that is, both the main adjusting rod 611 and the adjusting support rod 612 are hexagonal long rods, and the adjusting support rod 612 is sleeved in the main adjusting rod 611. Therefore, the sleeved arrangement of the adjusting support rod 612 and the main adjusting rod 611 can be selected in 6 directions. Thus, the adjusting support rod 612 can be adjusted to be sleeved in the main adjusting rod 611 in different directions as needed.

[0050] Further improvements are made in, such as Figure 3 , Figure 4 As shown, the first limiting sleeve 33 and the second limiting sleeve 43 are both provided with observation ports 73 and scales 74 for observing the movement distance of the movable rod 7. Through the observation ports 73, the rotation distance of the movable rod 7 inside the first limiting sleeve 33 and the second limiting sleeve 43 can be observed. By observing the rotation distance of the movable rod 7, the distance of the hook 31 moving back and forth and the distance of the pushing part 41 pushing up and down can be determined, so as to more intuitively and accurately control the repositioning distance of the skull.

[0051] Both the first limiting sleeve 33 and the second limiting sleeve 43 are provided with a second limiting screw 75 in the observation port 73. The connecting rod 8 is provided with at least one through hole 82 evenly. The second limiting screw 75 passes through the through hole 82. The connecting rod 8 can be provided with multiple through holes 82. The second limiting screw 75 can be screwed into different through holes 82 according to the different moving distances of the first movable structure 32 in the first limiting sleeve 33 and the second movable structure 42 in the second limiting sleeve 43. When the second limiting screw 75 is screwed into the through hole 82, the opening shape of the observation port 73 restricts the second limiting screw 75 so that the connecting rod 8 can only move back and forth in the first limiting sleeve 33 or the second limiting sleeve 43, but cannot rotate with the movable rod 7. This is to avoid misalignment of the hook 31 or the pushing part 41 connected to the lower end of the connecting rod 8, which would result in poor reset effect.

[0052] A further improvement is that the front end of the operating lever 1 is vertically downward, making the support arm 2 perpendicular to the surgical field of vision, which facilitates operation by medical staff; and an angle α is formed between the front end of the operating lever 1 and the handle 5 at the end of the operating lever 1. The value of the angle α is in the range of 45° to 180°. Due to different surgical habits of each doctor or different surgical scenarios, different angles can adapt to different needs. In this embodiment, the values ​​of the angle α and the angle β are both 90°.

[0053] Further improvements are made in, such as Figure 2 , Figure 7 As shown, the lower end of the support arm 2 is provided with a support portion 21 for fitting onto the outside of the pedicle screw 30. The support portion 21 has at least two openings 211. In this embodiment, the support portion 21 has four openings 211, and the openings 211 are arranged opposite each other in pairs. When the support portion 21 supports the connecting rod 20, the two openings 211 communicate with the U-shaped groove of the pedicle screw 30, so that the connecting rod 20 can pass through the U-shaped groove of the pedicle screw 30 and the two openings 211 of the support portion 21. The U-shaped groove of the nail 30 is provided with a nut, and the support arm 2 is a hollow structure. Therefore, when the connecting rod 20 is inserted into the U-shaped groove of the pedicle screw 30 and the two openings 211 of the support part 21, the nut screwdriver can tighten or loosen the nut in the U-shaped groove of the pedicle screw 30 in the hollow structure of the support arm 2 to adjust the support arm 2 to hold the connecting rod 20, so that the support arm 2 can be supported or pushed on the connecting rod 20. The four openings 211 are arranged in pairs opposite each other, so they can be adapted to support the connecting rod 20 at different angles.

[0054] In practical use, first place the pre-bent connecting rod 20 into the U-shaped groove of the cervical pedicle screw 30 on one side and tighten the nut. Hold the handle 5 and insert the support part 21 of the support arm 2 into the pedicle screw 30 to support the connecting rod 20 of the occipital fixation plate. Then adjust the position of the first movable arm 3 on the connecting rod 22 so that the hook 31 at the end of the first movable arm 3 is aligned with the reset hook 10 of the occipital fixation plate and engages with the reset hook 10. Next, rotate the movable rod 7 of the second movable arm 4 to drive the connecting rod 8 of the second movable arm 4 and the pushing part 41 to push downward. At this time, the first movable arm 3, under the action of the pushing part 41, rotates around the arc of the connecting rod 22. During the rotation of the first movable arm 3, the hook 31 at the end of the first movable arm 3 drives the reduction hook 10 to rotate backward, thereby causing the occipital fixation plate and the skull to rotate backward. The backward rotation of the skull results in the upward and backward displacement of the skull base, that is, the downward and forward displacement of the odontoid process of the axis. When the hook 31 engages with the reduction hook 10, the movable rod 7 of the first movable arm 3 is rotated to drive the connecting rod 8 of the first movable arm 3 and the hook 31 to move forward. At this time, the occipital fixation plate and the skull are opened and reduced. During the operation, the movable rod 7 of the first movable arm 3 can be rotated to drive the occipital fixation plate and the skull to shorten and return to their original position, further realizing the reduction of the skull base depression.

[0055] Once the fluoroscopic repositioning is satisfactory, if the pre-bent arc of the connecting rod 20 under the support arm 2 is appropriate, directly tighten the nut on the occipital fixation plate to lock the connecting rod 20, and place the pre-bent connecting rod 20 on the other side of the occipital fixation plate to lock it; if the pre-bent arc of the connecting rod 20 under the support arm 2 is not appropriate, first pre-bend the appropriate connecting rod 20, place it on the other side of the occipital fixation plate and tighten the nut to maintain the repositioning position, then remove the repositioning device and take out the connecting rod 20 to adjust the pre-bent arc before putting it back and locking it.

[0056] In summary, the repositioning device of this invention uses a first movable arm to move the hook back and forth, thereby causing the occipital fixation plate and skull to be opened and repositioned or shortened back into place. The repositioning can be flexibly adjusted according to the surgical situation, improving the practicality of the device and enhancing the repositioning effect of basilar indentation. The second movable arm moves the pushing part downwards, causing the first movable arm to rotate around the connecting rod arc, thus causing the skull to rotate backwards and reposition. This backward rotation results in upward and backward displacement of the skull base, i.e., downward and anterior displacement of the odontoid process of the axis vertebra. This further solves the problems of insufficient repositioning force and complex and difficult repositioning operations in existing technologies, effectively improving the repositioning effect of basilar indentation and increasing the work efficiency of medical staff. Both the connecting rod and the adjusting rod can rotate around the support arm to accommodate situations where the support arm supports the connecting rods at the left and right pedicle screws. In both cases, the second and first movable arms can drive the skull to reposition, improving the applicability of the device and making it easy to operate, thereby increasing the work efficiency of medical staff.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for reducing skull base depression, characterized in that, The device includes an operating lever (1), a first movable arm (3), and a second movable arm (4). The operating lever (1) has a handle (5) at its end and a support arm (2) fixedly attached to its front end. The support arm (2) supports the connecting rod (20) at the pedicle screw (30). A connecting rod (22) is attached to the support arm (2). The first movable arm (3) is movably connected to the connecting rod (22). The end of the first movable arm (3) has a hook (31) for engaging with the reduction hook (10) on the occipital fixation plate. The movable arm (3) drives the hook (31) to move back and forth, so as to drive the occipital fixation plate and the skull to open and reposition or shorten and return to their original position; the second movable arm (4) is movably connected to the support arm (2) through the adjusting rod (61), and the lower end of the second movable arm (4) is provided with a pushing part (41), and is locked on the first movable arm (3) through the pushing part (41); the second movable arm (4) drives the pushing part (41) to move downward, so as to drive the first movable arm (3) to rotate around the arc of the connecting rod (22), thereby driving the skull to rotate back and reposition; Both the connecting rod (22) and the adjusting rod (61) can rotate around the supporting arm (2) to adapt to the fact that when the supporting arm (2) supports the connecting rod (20) at the left and right pedicle screws (30), the skull can be repositioned through the second movable arm (4) and the first movable arm (3); The first movable arm (3) includes a first movable structure (32), a first limiting sleeve (33) and a collar (35). The first limiting sleeve (33) is movably sleeved on the outside of the first movable structure (32). The collar (35) is disposed on the first limiting sleeve (33). The first limiting sleeve (33) is provided with a second limiting member (36) at one end near the pushing part (41) to prevent the second movable arm (4) from sliding down. The second movable arm (4) includes a second movable structure (42) and a second limiting sleeve (43). The second limiting sleeve (43) is sleeved on the outside of the second movable structure (42). The pushing part (41) is located at the lower end of the second movable structure (42). The pushing part (41) is an inverted U-shaped bayonet. The bayonet of the pushing part (41) acts on the first limiting sleeve (33) of the first movable arm (3).

2. The skull base depression reduction device according to claim 1, characterized in that, The end of the hook (31) is provided with a groove (311), and the groove (311) engages with the bottom of the repositioning hook (10) on the occipital fixation plate.

3. The skull base depression reduction device according to claim 1, characterized in that, The connecting rod (22) is movably sleeved on the support arm (2) through the first sleeve (91); the collar (35) is movably sleeved on the connecting rod (22) so that the first movable arm (3) can move left and right on the connecting rod (22) and can also rotate around the arc of the connecting rod (22); the end of the connecting rod (22) away from the support arm (2) is provided with a first limiting member (34) to prevent the collar (35) from slipping out, and the first limiting member (34) is detachable.

4. The skull base depression reduction device according to claim 1, characterized in that, The adjusting rod (61) is a polygonal long rod, which includes an adjusting main rod (611) and an adjusting support rod (612). One end of the adjusting main rod (611) is movably sleeved on the second movable arm (4) through the second sleeve (92), and the other end is movably sleeved on the outside of the adjusting support rod (612). The end of the adjusting support rod (612) away from the adjusting main rod (611) is movably sleeved on the support arm (2) through the third sleeve (93) to adjust the second movable arm (4) to engage with the first movable arm (3) at different positions, and the adjusting support rod (612) is fixed in the adjusting main rod (611) by the first limiting screw (613).

5. The skull base depression reduction device according to claim 1, characterized in that, Both the first movable structure (32) and the second movable structure (42) include a movable rod (7) and a connecting rod (8). One end of the connecting rod (8) is provided with a groove (81), and one end of the movable rod (7) is provided with a protrusion (71). The groove (81) and the protrusion (71) cooperate to make the connecting rod (8) and the movable rod (7) movably connected. The end of the movable rod (7) away from the protrusion (71) is provided with a nut (72). The nut (72) drives the movable rod (7) to engage with the first limiting sleeve (33) or the second limiting sleeve (43) threadedly, so as to drive the connecting rod (8) together with the hook (31) or the pushing part (41) to move.

6. The skull base depression reduction device according to claim 5, characterized in that, Both the first limiting sleeve (33) and the second limiting sleeve (43) are provided with an observation port (73) and a scale (74) for observing the movement distance of the movable rod (7), and both are provided with a second limiting screw (75) in the observation port (73). The connecting rod (8) is provided with at least one through hole (82) evenly. The second limiting screw (75) passes through the through hole (82), and the second limiting screw (75) is restricted by the observation port (73) to restrict the connecting rod (8) from rotating in the first limiting sleeve (33) or the second limiting sleeve (43).

7. The skull base depression reduction device according to claim 1, characterized in that, The front end of the operating lever (1) is vertically downward; and an angle α is formed between the front end of the operating lever (1) and the handle (5) at the end of the operating lever (1), and the value of the angle α is in the range of 45°~180°.

8. The skull base depression reduction device according to claim 1, characterized in that, The lower end of the support arm (2) is provided with a support part (21) for sleeved on the outside of the pedicle screw (30). The support part (21) has at least two openings (211), and the two openings (211) are connected to the U-shaped groove of the pedicle screw (30). The connecting rod (20) passes through the U-shaped groove of the pedicle screw (30) and the two openings (211) of the support part (21) so that the connecting rod (20) is locked at the lower end of the support arm (2).

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