Axis vertebral fracture reduction surgical instrument

Abstract

The present application relates to the field of medical devices, and in particular to an axis vertebral fracture reduction surgical instrument, comprising a reduction rod, one end of which is processed with an external thread for threaded connection with the axis vertebral body, a reduction cylinder slidably connected to the reduction rod, a reduction nut threadedly connected to the reduction rod, the reduction nut is located at one end of the reduction cylinder away from the reduction rod thread, the reduction nut is rotatably connected to the reduction cylinder to drive the reduction cylinder to slide. The present application has the effect of being able to quickly and stably reduce the displaced axis vertebral body.

Description

Technical Field

[0001] The present application relates to the field of medical instruments, and in particular to surgical instruments for reducing axis vertebral fractures. Background Art

[0002] The site of the axis vertebral fracture is between the base of the odontoid process and the bilateral pedicles. Because the anterior half of the axis vertebral body together with the atlas is displaced forward, while the posterior fracture fragments of the axis vertebral body remain in place, there is a risk of spinal cord compression.

[0003] Treatment of axis vertebral fractures should still be based on conservative treatment, and different treatments should be adopted according to the unique injury mechanism of each patient. Patients without nerve damage and obvious displacement are treated with plaster fixation; those with displacement and inability to be reduced are mainly treated with reduction, fixation and fusion to prevent long-term instability, deformed fusion and degenerative atlantoaxial arthritis. During reduction and fusion, how to quickly and stably reduce the displaced axis vertebra is the key to the success of the operation. Summary of the invention

[0004] In order to achieve rapid and stable reduction of the displaced axis vertebral body, the present application provides an axis vertebral body fracture reduction surgical instrument.

[0005] The present application provides an axis vertebral fracture reduction surgical instrument that adopts the following technical solution:

[0006] A surgical instrument for reducing an axis vertebral fracture comprises a reduction rod, one end of which is processed with an external thread for threaded connection with the axis vertebral body, a reduction cylinder is slidably connected to the reduction rod, a reduction nut is threadedly connected to the reduction rod, the reduction nut is located at one end of the reduction cylinder away from the reduction rod thread, and the reduction nut is rotatably connected to the reduction cylinder to drive the reduction cylinder to slide.

[0007] By adopting the above technical solution, when in use, the reset rod is directly inserted into the front half of the displaced axis vertebral body in sequence, and finally screwed on the rear side of the axis vertebral body, and then the reset nut is screwed, the reset nut will drive the reset tube to move on the reset rod, thereby pushing the displaced front half of the axis vertebral body toward the rear side of the axis vertebral body through the reset tube, so as to realize the reset of the front half of the axis vertebral body. During the reset process, the reset rod inserted in the front half of the axis vertebral body will play a guiding role, and the reset is very convenient and stable.

[0008] Optionally, the reset cylinder is bent inwardly toward one end of the reset nut to form a first locking portion, and the reset nut includes a threaded cylinder threadedly connected to the reset rod and a rotating cylinder fixed to the outer wall of the threaded cylinder, the threaded cylinder extends outward from the end of the rotating cylinder toward one end of the reset cylinder and bends outward to form a second locking portion, and a slot is formed between the second locking portion and the rotating cylinder for the first locking portion to be embedded in.

[0009] By adopting the above technical solution, when the reset nut rotates, the reset tube will be driven to move back and forth on the reset rod through the cooperation between the clamping groove and the first clamping portion, which is very convenient to operate.

[0010] Optionally, a reinforcing cylinder is fixedly connected to one end of the first clamping portion facing the reset nut, and an embedding groove for embedding the reinforcing cylinder is formed at one end of the rotating cylinder facing the clamping groove.

[0011] By adopting the above technical solution, the reinforcing tube can strengthen the supporting strength of the first clamping part, so as to prevent the first clamping part from being broken due to excessive force when the reset nut drives the reset tube to slide on the reset rod through the first clamping part.

[0012] Optionally, an anti-slip groove is processed on the outer wall of the rotating drum.

[0013] By adopting the above technical solution, it is convenient for doctors to rotate the rotating drum.

[0014] Optionally, an auxiliary tube is fixedly connected to the inner wall of the reset tube, and the reset rod includes a mounting rod threadedly connected to the reset nut and a limiting rod slidingly matched with the auxiliary tube, and the cross-section of the limiting rod is non-circular to limit the auxiliary tube from rotating around the limiting rod.

[0015] By adopting the above technical solution, the cross-section of the limit rod is non-circular, so that the auxiliary cylinder can slide along the length direction of the limit rod but cannot rotate around the limit rod, thereby preventing the reset cylinder from abutting against the displaced axis vertebral body to reset, and causing wear to the displaced axis vertebral body due to the reset cylinder rotating relative to the axis vertebral body.

[0016] Optionally, the reset rod further comprises a guide rod fixedly connected to an end of the limiting rod away from the mounting rod, and a diameter of the guide rod is smaller than a diameter of the mounting rod.

[0017] By adopting the above technical solution, the larger diameter of the mounting rod can provide sufficient supporting force, and the smaller diameter of the guide rod can reduce the damage to the human axis.

[0018] Optionally, a handle is provided at one end of the reset rod that is not threaded.

[0019] By adopting the above technical solution, it is convenient for doctors to operate the reduction rod by means of a handle and screw it onto the axis vertebral body.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. Through the cooperation of the reset rod, the reset cylinder and the reset nut, when the displaced axis vertebral body needs to be reset, the reset rod is directly inserted into the displaced axis vertebral body and finally screwed into the posterior segment of the non-displaced axis vertebral body. The reset cylinder is driven to slide on the reset rod by the reset nut, and the displaced axis vertebral body can be reset by the reset cylinder;

[0022] 2. The arrangement of the threaded cylinder and the rotating cylinder allows a slot to be formed between the two for the first clamping portion to be embedded, which can not only realize the rotational connection between the reset nut and the reset cylinder, but also drive the reset cylinder to reciprocate along the length direction of the reset rod, making the operation more convenient and flexible;

[0023] 3. The setting of the auxiliary cylinder can fix the circumferential position of the reset cylinder, so as to avoid the reset nut driving the reset cylinder to rotate when pushing the axis vertebral body when the displaced axis vertebral body is reset, thereby preventing the axis vertebral body from being worn due to the reset nut driving the reset cylinder to rotate when pushing the axis vertebral body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of this application.

[0025] Figure 2 It is a schematic diagram of the main cross-section of this application.

[0026] Figure 3 It is a partial cross-sectional schematic diagram made to illustrate the connection method between the reset cylinder and the reset nut.

[0027] Explanation of the reference numerals: 1. reset rod; 11. screw head; 12. mounting rod; 13. limiting rod; 14. guide rod; 15. auxiliary rod; 151. clamping block; 152. limiting groove; 2. reset cylinder; 21. first clamping portion; 22. auxiliary cylinder; 23. reinforcing cylinder; 3. reset nut; 31. threaded cylinder; 32. rotating cylinder; 321. anti-slip groove; 33. second clamping portion; 34. clamping groove; 35. embedded groove; 4. handle. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 This application is described in further detail.

[0029] The present application embodiment discloses a surgical instrument for reduction of axis vertebral fracture. Figure 1The surgical instrument for reduction of axis vertebral fracture includes a reduction rod 1, a reduction cylinder 2 slidably connected to the reduction rod 1, and a reduction nut 3 threadedly connected to the reduction rod 1. An external thread is processed at one end of the reduction rod 1 to form a screw head 11. The reduction nut 3 is located at the end of the reduction cylinder 2 away from the screw head 11. The reduction nut 3 is rotatably connected to the reduction cylinder 2 to drive the reduction cylinder 2 to slide back and forth on the reduction rod 1. When the displaced axis vertebral body needs to be reduced, the reduction rod 1 is directly inserted into the displaced axis vertebral body, and the screw head 11 is finally screwed onto the non-displaced axis vertebral body. At this time, the displaced axis vertebral body will be sleeved on the reduction rod 1 and located between the non-displaced axis vertebral body and the reduction cylinder 2, and then the reduction nut 3 is screwed. The reduction nut 3 will push the displaced axis vertebral body to move toward the non-displaced axis vertebral body through the reduction cylinder 2, thereby achieving the reduction of the axis vertebral body. In the process of the reduction cylinder 2 pushing the axis vertebral body to be reduced, the reduction rod 1 will also play a guiding role, making the reduction more stable.

[0030] Reference Figure 2 and Figure 3 The reset tube 2 is bent inwardly toward one end of the reset nut 3 to form a first clamping portion 21. The reset nut 3 includes a threaded tube 31 threadedly connected to the reset rod 1 and a rotating tube 32 sleeved and fixed on the outer wall of the threaded tube 31, wherein the threaded tube 31 extends outward toward one end of the reset tube 2 and bends outward to form a second clamping portion 33. A clamping groove 34 for the first clamping portion 21 to be embedded is formed between the second clamping portion 33 and the end of the threaded tube 31 toward the reset tube 2. The rotational connection between the reset tube 2 and the reset nut 3 can be achieved by embedding the first clamping portion 21 into the clamping groove 34. When the reset nut 3 is screwed, the reset nut 3 will drive the reset tube 2 to slide along the length direction of the reset rod 1 through the cooperation of the first clamping portion 21 and the clamping groove 34, thereby pushing the axis vertebral body to be reset.

[0031] In order to prevent the first clamping portion 21 from being deformed or broken when the reset nut 3 drives the reset cylinder 2 to slide through the first clamping portion 21, a reinforcing cylinder 23 is fixedly connected to the side of the first clamping portion 21 away from the reset cylinder 2. The reinforcing cylinder 23 is sleeved on the reset rod 1, and an embedding groove 35 for the reinforcing cylinder 23 to be embedded is opened at one end of the rotating cylinder 32 facing the clamping groove 34. The reinforcing cylinder 23 can increase the supporting strength of the first clamping portion 21.

[0032] Reference Figure 1 In order to facilitate the staff to rotate the rotating drum 32, an anti-skid groove 321 is processed on the outer wall of the rotating drum 32. The staff can rotate the rotating drum 32 by holding the anti-skid groove 321 on the rotating drum 32, which makes the rotation more convenient.

[0033] Reference Figure 2The reduction rod 1 can be made of medical stainless steel or titanium alloy, including a mounting rod 12 threadedly connected to the threaded tube 31, a limiting rod 13 integrally fixed to one end of the mounting rod 12, and a guide rod 14 integrally fixed to the end of the limiting rod 13 away from the mounting rod 12. The screw head 11 is located at the end of the guide rod 14 away from the limiting rod 13. The diameter of the guide rod 14 is smaller than the diameter of the mounting rod 12, so that the mounting rod 12 has sufficient supporting strength, and the guide rod 14 can cause less damage to the axis vertebral body when it is passed through the displaced axis vertebral body.

[0034] Reference Figure 2 and Figure 3 The reset cylinder 2 is slidably connected to the limit rod 13. Specifically, an auxiliary cylinder 22 is fixed to the inner wall of the reset cylinder 2. The longitudinal section of the limit rod 13 is a non-circular shape. The auxiliary cylinder 22 is slidably sleeved on the limit rod 13, thereby fixing the axial position of the reset cylinder 2 through the auxiliary cylinder 2, so that the reset cylinder 2 can only slide along the length direction of the reset rod 1 with the reset nut 3, but cannot rotate with the reset nut 3, so as to avoid the reset cylinder 2 rotating when pushing the axis vertebral body and causing wear on the contact between the axis vertebral body and the reset cylinder 2. Among them, the longitudinal section of the limit rod 13 can be elliptical, polygonal or special-shaped, as long as the axial limit of the reset cylinder 2 can be achieved.

[0035] Reference Figure 2 An auxiliary rod 15 is fixedly connected to one end of the mounting rod 12 away from the limiting rod 13, and a handle 4 is provided at one end of the auxiliary rod 15 away from the mounting rod 12. When the reset rod 1 is screwed onto the axis vertebral body, the staff can directly operate the handle 4 to operate the reset rod 1 to rotate, thereby screwing the reset rod 1 onto the axis vertebral body.

[0036] The handle 4 may be directly fixed to the auxiliary rod 15 , or the handle 4 may be detachably connected to the auxiliary rod 15 , which is not specifically limited here.

[0037] The implementation principle of the surgical instrument for reducing an axis vertebral fracture in an embodiment of the present application is as follows: during the operation, one end of the screw head 11 of the reduction rod 1 is directed toward the displaced axis vertebra and is inserted into the displaced axis vertebra, and then the end of the screw head 11 is screwed onto the non-displaced axis vertebra, and the end of the reduction tube 2 away from the reduction nut 3 is operated to abut against the side wall of the displaced axis vertebra, and the reduction nut 3 is screwed, and the force of the reduction nut 3 is used to press the reduction tube 2, which will also push the displaced axis vertebra to move toward the non-displaced axis vertebra, thereby completing the reduction of the axis vertebra.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An axis vertebral fracture reduction surgical instrument, characterized in that: The invention comprises a reset rod (1), one end of which is processed with an external thread for being threadedly connected to an axis vertebral body, a reset tube (2) being slidably connected to the reset rod (1), a reset nut (3) being threadedly connected to the reset rod (1), the reset nut (3) being located at an end of the reset tube (2) away from the threaded end of the reset rod (1), the reset nut (3) being rotatably connected to the reset tube (2) to drive the reset tube (2) to slide; one end of the reset tube (2) is bent inwardly toward the reset nut (3) to form a first locking portion (21), the reset nut (3) comprising a threaded tube (31) threadedly connected to the reset rod (1) and a reset nut (3) fixedly connected to the threaded end. A rotating cylinder (32) is provided on the outer wall of the threaded cylinder (31), the threaded cylinder (31) extends outward from the end of the rotating cylinder (32) toward one end of the reset cylinder (2) and is bent outward to form a second clamping portion (33), and a clamping groove (34) for the first clamping portion (21) to be embedded is formed between the second clamping portion (33) and the rotating cylinder (32); an auxiliary cylinder (22) is fixedly connected to the inner wall of the reset cylinder (2), the reset rod (1) comprises a mounting rod (12) threadedly connected to the reset nut (3) and a limiting rod (13) slidably matched with the auxiliary cylinder (22), and the cross section of the limiting rod (13) is non-circular so as to limit the auxiliary cylinder (22) from rotating around the limiting rod (13).

2. The axis vertebral fracture reduction surgical instrument according to claim 1, characterized in that: A reinforcing tube (23) is fixedly connected to one end of the first clamping portion (21) facing the reset nut (3), and an embedding groove (35) for embedding the reinforcing tube (23) is formed at one end of the rotating tube (32) facing the clamping groove (34).

3. The axis vertebral fracture reduction surgical instrument according to claim 1, characterized in that: An anti-slip groove (321) is processed on the outer wall of the rotating drum (32).

4. The axis vertebral fracture reduction surgical instrument according to claim 1, characterized in that: The reset rod (1) further comprises a guide rod (14) fixedly connected to an end of the limiting rod (13) away from the installation rod (12), and the diameter of the guide rod (14) is smaller than the diameter of the installation rod (12).

5. The axis vertebral fracture reduction surgical instrument according to claim 1, characterized in that: A handle (4) is provided at one end of the reset rod (1) that is not threaded.

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