Posterior spinal fracture dislocation reduction device
By designing a posterior spinal fracture dislocation reduction device including a spreading component and an extended sleeve, the problem of difficulty in small joint locking reduction in spinal reduction surgery is solved, and effective joint expansion and reduction is achieved, reducing the risk of surgery.
Patent Information
- Application Number
- CN202421324740.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-12
AI Technical Summary
In spinal reduction surgery, especially in cases of small joint junctions with fractures and dislocations in cervical and thoracic segments, the prior art is difficult to effectively open small joints, resulting in difficulty in reducing and increasing the risk of misoperation and nerve damage.
A repositioning device for posterior spinal fracture dislocation is designed, including a propagation assembly and an extension sleeve. The stretching assembly consists of an adjustment rod, a sleeve and an extension sleeve. Through the sliding of the sleeve on the adjustment rod, the extension sleeve is driven to force the pedicle screw to gradually open the joint.
The device can effectively open the small joints, simplify the reduction process, reduce the risk of misoperation and nerve damage, and improve the success rate of fracture and dislocation of the posterior spine.
Smart Images
Figure CN222737977U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of spinal column reduction instruments, in particular to a spinal column posterior fracture dislocation reduction device. Background Art
[0002] In cases of spinal fracture dislocation, especially cervical thoracic fracture combined with dislocation and facet locking (the inferior articular process of the upper cervical vertebra exceeds the superior articular process of the lower cervical vertebra, which causes facet locking), there is a problem of difficulty in reducing the dislocated segment during the reduction surgery. The reason is that there is no suitable instrument to complete the distraction and reduction of the dislocated facet joint. The routine operation during the operation is to install the connecting rod after the pedicle screws (or lateral mass screws) are inserted in the dislocated and upper and lower adjacent segments, and then distract the dislocated segment to align the tips of the upper and lower articular processes to achieve the purpose of facet reduction. For cases with difficult reduction, it is often due to asymmetric locking or facet fracture, which makes it difficult for the distraction force to act on the facet joint through the pedicle screws (or lateral mass screws), making it difficult to complete the reduction. Difficult reduction increases the risk of misoperation and nerve damage. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a device for reducing posterior spine fracture dislocation, which can facilitate the expansion of small joints.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a posterior spinal fracture dislocation reduction device, comprising a distraction assembly and an extension sleeve; the distraction assembly comprises an adjustment rod and two sleeves arranged on the rod body of the adjustment rod; the two sleeves are parallel, at least one of the sleeves can slide along the axis direction of the rod body of the adjustment rod, and the sleeve is detachably arranged on the rod body of the adjustment rod;
[0005] The extension sleeve is detachably connected to the sleeve, and a screw tail cap clamping interface is provided at one end of the extension sleeve away from the adjustment rod.
[0006] Furthermore, the above-mentioned posterior spinal fracture dislocation reduction device also includes a sliding assembly, and the rod body of the adjustment rod is provided with meshing teeth along its own axial direction; the sliding assembly includes a sleeve, a gear and a rotating component; the sleeve is sleeved on the rod body of the adjustment rod, the sleeve is connected to one of the sleeves, the gear is arranged in the sleeve, and the gear is meshed with the meshing teeth, and the rotating component has a rotating shaft that passes through the sleeve and is transmission-connected to the gear.
[0007] Furthermore, the sliding assembly further comprises a limit plate, which is swingably arranged on the outer side wall of the sliding sleeve, and one end of the limit plate can enter and exit the tooth groove between adjacent meshing teeth.
[0008] Furthermore, the sleeve includes a connecting portion and a sleeve rod portion, two ends of the connecting portion are respectively connected to the adjustment rod and the sleeve rod portion, the sleeve rod portion is connected to the extension sleeve, and an angle of 100° to 120° is formed between the sleeve rod portion and the connecting portion.
[0009] Furthermore, the sleeve is threadedly connected to the extension sleeve.
[0010] The beneficial effects of the utility model are as follows: a distraction assembly with an adjusting rod and a sleeve is added; during the reduction process, the pedicle screws of the dislocated vertebra and the adjacent vertebra are first inserted, and the inserted pedicle screws are connected together through a connecting rod, and then the sleeve is connected to the extension sleeve, and then the extension sleeve is clamped with the tail cap of the corresponding pedicle screw by using the screw tail cap clamping interface; then the two sleeves are placed on the adjusting rod, so that they can be assembled above the dislocated vertebra and the adjacent vertebra to form a distraction assembly, and then the sleeve slides on the adjusting rod to drive the extension sleeve to apply force to the pedicle screw, thereby gradually distracting the joint. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic structural diagram of a posterior spinal fracture and dislocation reduction device proposed by the utility model;
[0012] Figure 2 This is a schematic cross-sectional structure diagram of a posterior spinal fracture dislocation reduction device proposed by the utility model;
[0013] Description of labels:
[0014] 1. Spreading assembly; 11. Adjusting rod; 111. Engaging teeth; 12. Sleeve; 121. Connecting part; 122. Sleeve rod part;
[0015] 2. Extension sleeve; 21. Screw tail cap card interface;
[0016] 3. Sliding assembly; 31. Sliding sleeve; 32. Gear; 33. Rotating component; 34. Limiting plate;
[0017] 4. Pedicle screws. DETAILED DESCRIPTION
[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.
[0019] Please refer to Figure 1As shown, the utility model is a posterior spinal fracture dislocation reduction device, comprising a distraction assembly 1 and an extension sleeve 2; the distraction assembly 1 comprises an adjustment rod 11 and two sleeves 12 arranged on the rod body of the adjustment rod 11; the two sleeves 12 are parallel, at least one of the sleeves 12 can slide along the axis direction of the rod body of the adjustment rod 11, and the sleeve 12 is detachably arranged on the rod body of the adjustment rod 11; the extension sleeve 2 is detachably connected to the sleeve 12, and a screw tail cap clamping interface 21 is arranged at one end of the extension sleeve 2 away from the adjustment rod 11. Preferably, the sleeve 12 is threadedly connected to the extension sleeve 2.
[0020] Working principle: During the reduction process, the pedicle screws 4 of the dislocated vertebra and the adjacent vertebra are first inserted, and the inserted pedicle screws 4 are connected together through the connecting rod, and then the sleeve 12 is connected to the extension sleeve 2, and then the extension sleeve 2 is clamped with the corresponding pedicle screw 4 by using the screw tail cap clamping interface 21; then the two sleeves 12 are placed on the adjusting rod 11, so that they can be assembled above the dislocated vertebra and the adjacent vertebra to form a distraction assembly 1, and then the sleeve 12 slides on the adjusting rod 11 to drive the extension sleeve 2 to apply force to the pedicle screw 4, thereby gradually distracting the joint; then the tightening head of the screw tightening device is inserted into the sleeve 12 and contacts with the nut in the tail cap of the pedicle screw 4, and then the screw tightening device is operated to lock the nut to fix the connecting rod. It should be noted that the reduction and fixation process is: install the connecting rod, first tighten the nuts of the pedicle screws 4 on the adjacent vertebrae, open them to complete the "tip-to-tip" reduction of the small joints, and then tighten the nuts of the pedicle screws 4 on the dislocated vertebrae to complete the locking of the connecting rod and the firm fixation after reduction.
[0021] It should be noted that the insertion depth of the pedicle screw 4 on the dislocated vertebral body is deeper than the insertion depth of the pedicle screw 4 on the adjacent vertebral body.
[0022] In one implementation, please refer to Figure 1 and Figure 2 As shown, the above-mentioned posterior spinal fracture dislocation reduction device also includes a sliding assembly 3, and the rod body of the adjustment rod 11 is provided with meshing teeth 111 along its own axis direction; the sliding assembly 3 includes a sliding sleeve 31, a gear 32 and a rotating component 33; the sliding sleeve 31 is sleeved on the rod body of the adjustment rod 11, the sliding sleeve 31 is connected to one of the sleeves 12, the gear 32 is arranged in the sliding sleeve 31, and the gear 32 is meshed with the meshing teeth 111, and the rotating component 33 has a rotating shaft that passes through the sliding sleeve 31 and is transmission-connected to the gear 32. In the process of adjusting the distance between the two sleeves 12, the operator drives the gear 32 to rotate by operating the rotating component 33, so that the sliding sleeve 31 can drive the sleeve 12 to move on the rod body of the adjustment rod 11.
[0023] In one implementation, please refer to Figure 1 and Figure 2 As shown, the sliding assembly 3 further includes a limit plate 34, which is swingably arranged on the outer wall of the sliding sleeve 31, and one end of the limit plate 34 can enter and exit the tooth groove between adjacent meshing teeth 111. In the process of adjusting the distance between the two sleeves 12, the operator operates one end of the limit plate 34 to withdraw from the tooth groove between adjacent meshing teeth 111, so that the gear 32 can be driven to drive the sliding sleeve 31 to move on the adjustment rod 11 through the rotating component 33. When there is no need to adjust the distance between the two sleeves 12, the operator operates one end of the limit plate 34 to extend into the tooth groove between adjacent meshing teeth 111, and uses the limit plate 34 to abut against the meshing teeth 111, which can prevent the reaction force of the joint on the extension sleeve 2 from driving the sleeve 12 backward.
[0024] In an optional implementation, please refer to Figure 1 As shown, the sleeve 12 includes a connecting portion 121 and a sleeve rod portion 122, the two ends of the connecting portion 121 are respectively connected to the adjustment rod 11 and the sleeve rod portion 122, the sleeve rod portion 122 is connected to the extension sleeve 2, and the sleeve rod portion 122 and the connecting portion 121 form an angle A, and the range of the clamp A is 100° to 120°. Among them, the preferred clamp A is 100°, 105°, 110°, 115°, 120°, and the most preferred clamp A is 100°. The sleeve 12 composed of the connecting portion 121 and the sleeve rod portion 122 that are connected to form an angle can make the adjustment rod 11 located obliquely above the vertebra to be expanded and the adjacent vertebra, thereby avoiding the adjustment rod 11, the sliding assembly 3 and other devices from being blocked and interfering with the operator's operation.
[0025] Since the specifications of the pedicle screws 4 used in the cervical vertebrae and the pedicle screws 4 used in the thoracic vertebrae / lumbar vertebrae during the operation are different, it is necessary to equip and use extension sleeves 2 and sleeve rod portions 122 of corresponding specifications, especially in the cervical thoracic segment operation, one extension sleeve 2 is required to be clamped on the tail cap of the pedicle screw 4 used in the cervical vertebra, and the other extension sleeve 2 is required to be clamped on the tail cap of the pedicle screw 4 used in the thoracic vertebra; therefore, in an optional embodiment, not only is it required that the sleeve rod portion 122 and the extension sleeve 2 be detachably connected, but it is also required that the sleeve rod portion 122 and the connecting portion 121 be detachably connected, wherein preferably, the connecting portion 121 is a clamp whose tightness is controlled by a screw, the connecting portion 121 can be clamped on the rod of the sleeve rod portion 122, and is fixed by a clamp, and the operator can control the distance between the connecting portion 121 and the pedicle screw 4 according to actual needs to facilitate supporting the joint.
[0026] Embodiment 1
[0027] A posterior spinal fracture dislocation reduction device, please refer to Figure 1 and Figure 2As shown, it includes a spreading component 1, an extension sleeve 2 and a sliding component 3; the spreading component 1 includes an adjusting rod 11 and two sleeves 12 arranged on the rod body of the adjusting rod 11; the two sleeves 12 are parallel to each other, at least one of the sleeves 12 can slide along the axis direction of the rod body of the adjusting rod 11, and the at least one sleeve 12 is detachably arranged on the rod body of the adjusting rod 11; the extension sleeve 2 can be detachably connected to the sleeve 12, and a screw tail cap clamping interface 21 is arranged at one end of the extension sleeve 2 away from the adjusting rod 11. The rod body of the adjusting rod 11 is provided with meshing teeth 111 along its own axial direction; the sliding assembly 3 includes a sleeve 31, a gear 32, a rotating component 33 and a limit plate 34; the sleeve 31 is sleeved on the rod body of the adjusting rod 11, the sleeve 31 is connected to one of the sleeves 12, the gear 32 is arranged in the sleeve 31, and the gear 32 is meshed with the meshing teeth 111, the rotating component 33 has a rotating shaft that passes through the sleeve 31 and is transmission-connected to the gear 32, the limit plate 34 is swingably arranged on the outer wall of the sleeve 31, and one end of the limit plate 34 can enter and exit the tooth groove between adjacent meshing teeth 111.
[0028] Working principle: During the reduction process, the pedicle screws 4 of the dislocated vertebra and the adjacent vertebra are first inserted, and the inserted pedicle screws 4 are connected together through the connecting rod, and then the sleeve 12 is connected to the extension sleeve 2, and then the extension sleeve 2 is clamped with the corresponding pedicle screw 4 by using the screw tail cap clamping interface 21; then the two sleeves 12 are placed on the adjusting rod 11, so that they can be assembled above the dislocated vertebra and the adjacent vertebra to form a distraction assembly 1, and then the sleeve 12 slides on the adjusting rod 11 to drive the extension sleeve 2 to apply force to the pedicle screw 4, thereby gradually distracting the joint; then the tightening head of the screw tightening device is inserted into the sleeve 12 and contacts with the nut in the tail cap of the pedicle screw 4, and then the screw tightening device is operated to lock the nut to fix the connecting rod. It should be noted that the reduction and fixation process is: install the connecting rod, first tighten the nuts of the pedicle screws 4 on the adjacent vertebrae, open them to complete the "tip-to-tip" reduction of the small joints, and then tighten the nuts of the pedicle screws 4 on the dislocated vertebrae to complete the locking of the connecting rod and the firm fixation after reduction.
[0029] In the process of adjusting the distance between the two sleeves 12, the operator operates one end of the limit plate 34 to withdraw from the tooth groove between the adjacent meshing teeth 111, so that the gear 32 can be driven by the rotating component 33 to drive the sliding sleeve 31 to move on the adjustment rod 11. When the distance between the two sleeves 12 does not need to be adjusted, the operator operates one end of the limit plate 34 to extend into the tooth groove between the adjacent meshing teeth 111, and uses the limit plate 34 to abut against the meshing teeth 111, which can prevent the reaction force of the joint on the extension sleeve 2 from driving the sleeve 12 backward.
[0030] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.
Claims
1. A device for reducing posterior spinal fracture and dislocation, characterized in that: It comprises a spreading assembly and an extension sleeve; the spreading assembly comprises an adjustment rod and two sleeves arranged on the rod body of the adjustment rod; the two sleeves are parallel, at least one of the sleeves can slide along the axis direction of the rod body of the adjustment rod, and the sleeve is detachably arranged on the rod body of the adjustment rod; The extension sleeve is detachably connected to the sleeve, and a screw tail cap clamping interface is provided at one end of the extension sleeve away from the adjustment rod.
2. The posterior spinal fracture dislocation reduction device according to claim 1, characterized in that: It also includes a sliding assembly, wherein the rod body of the adjusting rod is provided with meshing teeth along its own axial direction; the sliding assembly includes a sliding sleeve, a gear and a rotating component; the sliding sleeve is sleeved on the rod body of the adjusting rod, the sliding sleeve is connected to one of the sleeves, the gear is arranged in the sliding sleeve, and the gear is meshed with the meshing teeth, and the rotating component has a rotating shaft that passes through the sliding sleeve and is transmission-connected to the gear.
3. The posterior spinal fracture dislocation reduction device according to claim 2, characterized in that: The sliding assembly further comprises a limit plate, which is swingably arranged on the outer side wall of the sliding sleeve, and one end of the limit plate can enter and exit the tooth groove between adjacent meshing teeth.
4. The posterior spinal fracture dislocation reduction device according to claim 1, characterized in that: The sleeve comprises a connecting portion and a sleeve rod portion, two ends of the connecting portion are respectively connected to the adjusting rod and the sleeve rod portion, the sleeve rod portion is connected to the extended sleeve, and an angle of 100° to 120° is formed between the sleeve rod portion and the connecting portion.
5. The posterior spine fracture dislocation reduction device according to claim 1, characterized in that: The sleeve is threadedly connected to the extension sleeve.