CN215458525U - Vertebral pedicle screw and spine internal fixation system with same - Google Patents
Vertebral pedicle screw and spine internal fixation system with same Download PDFInfo
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- CN215458525U CN215458525U CN202120004636.9U CN202120004636U CN215458525U CN 215458525 U CN215458525 U CN 215458525U CN 202120004636 U CN202120004636 U CN 202120004636U CN 215458525 U CN215458525 U CN 215458525U
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- pedicle screw
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- shaped groove
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Abstract
The utility model discloses a pedicle screw and a spine internal fixation system with the same, and belongs to the technical field of orthopedic implants. The positions of the U-shaped groove and the connecting rod are adjusted by translating the horizontal distance of the U-shaped groove, so that the pedicle screws and the connecting rod are prevented from being assembled, secondary bent rods or secondary implanted pedicle screws are not required, secondary trauma is avoided, the operation time is saved, and the cost is reduced; the utility model has simple structure, short processing period, high positioning precision and low cost.
Description
Technical Field
The utility model relates to the technical field of orthopedic implants, in particular to a pedicle screw and a spine internal fixation system with the same.
Background
At present, the spine instability caused by various reasons can be clinically treated, the spine correction can be completed, the normal physiological curvature can be maintained, the spine stability can be immediately stabilized in the operation, and the spine stability can be reconstructed, so that the three-dimensional hyperstatic fixation of the spine internal fixation system can be realized. However, the traditional spinal internal fixation system needs a pre-bending rod before implantation, or needs a secondary bending rod or a secondary implantation pedicle screw when the connecting rod can not be placed in the U-shaped groove of the pedicle screw, so that the secondary trauma of the operation is increased, and the operation time is prolonged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a pedicle screw without a secondary bent rod or a secondary implanted pedicle screw and a spine internal fixation system with the pedicle screw.
In order to solve the technical problems, the utility model provides the following technical scheme:
on the one hand, the pedicle screw comprises a screw seat and a screw body, wherein the screw seat is provided with a U-shaped groove for placing a connecting rod, the screw seat is horizontally and slidably connected onto the screw body, and an anti-slipping device is arranged on the screw seat and/or the screw body.
Further, the nail body is including the anchor portion that has the external screw thread and being located the connecting portion of anchor portion top, the connecting portion epirelief is equipped with down trapezoidal guide rail, the bottom of nail seat be equipped with guide rail matched with trapezoidal spout.
Furthermore, the length direction of the trapezoidal sliding groove is perpendicular to the opening directions of the two sides of the U-shaped groove.
Furthermore, a vertical through hole is formed in the trapezoidal sliding groove, the vertical through hole extends for a set distance along the length direction of the trapezoidal sliding groove, a protrusion used for being matched with the side wall of the vertical through hole to block and limit is arranged on the guide rail, and the guide rail and the protrusion are arranged in a split mode.
Furthermore, the bottommost end in the U-shaped groove is lower than the upper surface of the trapezoidal sliding groove.
Furthermore, an internal thread is arranged in the U-shaped groove, and a thread pressing nail for fixing the connecting rod is connected to the internal thread.
Furthermore, a vertical first jack is arranged on the outer side wall of the U-shaped groove, a plurality of second jacks corresponding to the first jacks are arranged on the upper surface of the guide rail, and the anti-slipping device is an insertion column arranged in the first jacks and the second jacks in a penetrating mode.
Further, the waist of guide rail is equipped with the steel ball jackscrew, the waist of trapezoidal spout is equipped with horizontal recess.
Further, the pitch between the lower adjacent threads of the anchor portion is greater than the pitch between the upper adjacent threads.
In another aspect, there is provided an internal spinal fixation system, comprising a pedicle screw and a connecting rod, wherein the pedicle screw is any one of the pedicle screws described above.
The utility model has the following beneficial effects:
according to the pedicle screw and the spinal internal fixation system with the same, the positions of the U-shaped groove and the connecting rod are adjusted by translating the horizontal distance of the U-shaped groove, so that the pedicle screw and the connecting rod are prevented from being assembled, a secondary bent rod or a secondary implanted pedicle screw is not required, secondary trauma is avoided, the operation time is saved, and the cost is reduced; the utility model has simple structure, short processing period, high positioning precision and low cost.
Drawings
FIG. 1 is a schematic view of a pedicle screw of the utility model in a situation in which it is in use;
FIG. 2 is a schematic view of another embodiment of the pedicle screw of the utility model in use;
FIG. 3 is a cross-sectional view of the pedicle screw of FIG. 1;
FIG. 4 is a schematic structural view of the nail body in FIG. 1;
FIG. 5 is a schematic view of the split structure of the nail body shown in FIG. 4;
fig. 6 is a schematic structural view of the nail seat in fig. 1, wherein (a) is a perspective view and (b) is a top view.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
In one aspect, the present invention provides a pedicle screw, as shown in fig. 1-6, comprising a screw seat 1 and a screw body 2, wherein the screw seat 1 has a U-shaped groove 11 for placing a connecting rod 3, the screw seat 1 is horizontally and slidably connected to the screw body 2, and the screw seat 1 and/or the screw body 2 is/are provided with an anti-slip device to prevent the screw seat 1 from slipping off the screw body 2.
When the device is used in the operation, the horizontal displacement of the U-shaped groove can be manually adjusted, and a secondary rod bending or secondary pedicle screw implantation is not needed; under X-ray machine perspective, the doctor can adjust U type groove horizontal displacement by manual work according to the position of backbone pedicle of vertebral arch screw, and the precision is high, avoids the injury that the secondary implantation caused. Has the significance of reducing trauma and enlarging indications clinically.
According to the pedicle screw, the positions of the U-shaped groove and the connecting rod are adjusted by translating the horizontal distance of the U-shaped groove, so that the pedicle screw and the connecting rod cannot be assembled, a secondary bent rod or a secondary implanted pedicle screw is not required, secondary trauma is avoided, the operation time is saved, and the operation material consumption cost is reduced to a certain extent; the utility model has simple structure, short processing period, high positioning precision and low cost, and can also improve the stability and the fusion rate of the implant, thereby having great significance for treating the spinal degenerative disease. The utility model is suitable for spinal internal fixation diseases under the conditions of spinal trauma, spinal degeneration and spinal deformity, and can create a good environment for achieving stability until healing and fusion.
For conveniently realizing the horizontal sliding connection between nail seat 1 and the nail body 2, can adopt guide rail and spout cooperation mode between the two, both can set up the guide rail on the nail seat, set up the spout on the nail body, also can set up the guide rail on the nail body, set up the spout on the nail seat, the various influence factor of comprehensive consideration, the preferred latter kind of mode of adoption, promptly: the nail body 2 can be including the anchor portion 21 that has the external screw thread and be located the connecting portion 22 that anchor portion 21 top is used for connecting nail seat 1, and connecting portion 22 epirelief is equipped with the guide rail 221 of falling trapezoidal (preferably the isosceles trapezoid that falls), and the bottom of nail seat 1 is equipped with the trapezoidal spout 12 with guide rail 221 matched with, like this better realization the horizontal sliding connection between nail seat 1 and the nail body 2, and simple to operate.
The length direction of the trapezoidal sliding groove 12 is preferably perpendicular to the opening directions of the two sides of the U-shaped groove 11, so that the two directions are not in the same direction, and the nail seat 1 can be better ensured to have higher strength. Furthermore, a vertical through hole 13 may be formed in the trapezoidal sliding groove 12, the vertical through hole 13 extends for a set distance along the length direction of the trapezoidal sliding groove 12, a protrusion 23 for performing a stop limit by matching with a side wall of the vertical through hole 13 is formed on the guide rail 221, and the guide rail 221 and the protrusion 23 are separately arranged. The protrusion 23 is the anti-slip device, and may be in various shapes such as circular, square, etc., the set distance of the vertical through hole 13 extending along the length direction of the trapezoidal sliding groove 12 is the moving range of the protrusion 23, and the vertical through hole 13 may be a long hole or a round hole, and may be adjusted according to actual needs. Thus, when the nail seat 1 horizontally slides on the nail body 2 to a certain extent, the inner side wall of the vertical through hole 13 on the trapezoidal sliding groove 12 of the nail seat 1 touches the protrusion 23 on the guide rail 221 of the nail body 2 to form a stop limit, thereby preventing the nail seat 1 from slipping off from the nail body 2. As shown in fig. 5, the protrusion 23 may be formed by inserting a pin into the guide rail 221. The assembly sequence of the pedicle screw of the utility model is preferably: firstly, the nail body 2 slides into the trapezoidal sliding chute 12 of the nail seat 1, and then the protrusion 23 is installed on the guide rail 221 of the nail body 2 from the upper part of the nail seat 1 through the vertical through hole 13.
After the nail seat 1 and the nail body 2 are adjusted horizontally, in order to lock the position between the two, the lowest end (the middle point L in (a) of fig. 6) in the groove of the U-shaped groove 11 is preferably lower than the upper surface (the middle point U in (a) of fig. 6, that is, the upper surface of the guide rail 221) of the trapezoidal sliding groove 12, so that after the connecting rod 3 is placed in the U-shaped groove 11, the lower surface of the connecting rod 3 falls on the upper surface of the guide rail 221, and then the nail seat 1 and the nail body 2 can be locked together while the connecting rod 3 is locked in the U-shaped groove 11. To facilitate the fixing of the connecting rod 3, a structure conventional in the art can be used, namely: an internal thread can be arranged in the U-shaped groove 11, and a thread pressing nail 4 for fixing the connecting rod 3 is connected to the internal thread.
It will be appreciated that the anti-slip device may also take other forms:
for example, the outer side wall of the U-shaped groove is provided with a vertical first jack, the upper surface of the guide rail is provided with a plurality of second jacks corresponding to the first jacks, and the anti-slip device is an insertion column used for penetrating through the first jacks and the second jacks. When the nail seat and the nail body are horizontally adjusted in place, the inserting column is inserted, and then the positions of the nail seat and the nail body can be locked.
For another example, the waist of the guide rail is provided with a steel ball top screw, the steel ball top screw is of a conventional structure in the field, and the steel ball top screw specifically comprises a steel ball positioned at the front end and a spring positioned at the rear part of the steel ball and used for pushing the steel ball; the waist of the trapezoidal chute is provided with a transverse groove. When the nail seat horizontally slides on the nail body to a certain degree, namely moves to the end part of the transverse groove, the steel ball is blocked by the end part of the transverse groove, so that the guide rail and the trapezoidal chute cannot be separated, and the nail seat is prevented from slipping off from the nail body.
The anchoring portion 21 of the shank 2 may be of a pitch-variable thread design, i.e.: as shown in fig. 4, the pitch between the lower adjacent threads of the anchor portion 21 may be greater than the pitch between the upper adjacent threads thereof, so that the shank 2 has a quick screwing capability.
In another aspect, the present invention provides an internal spinal fixation system, which comprises a connecting rod and the above-mentioned pedicle screw, and the structure of the pedicle screw is the same as that described above, and thus the description thereof is omitted.
The spinal internal fixation system is improved on the basis of a conventional spinal internal fixation system, and the position of the U-shaped groove and the position of the connecting rod are adjusted by the pedicle screws through translating the horizontal distance of the U-shaped groove, so that the pedicle screws are prevented from being assembled with the connecting rod, secondary bent rods or secondary implanted pedicle screws are not needed, secondary trauma is avoided, the operation time is saved, and the cost is reduced; the utility model has simple structure, short processing period, high positioning precision and low cost.
The method of use of the spinal internal fixation system of the present invention may be referred to as follows:
1. preparation before implantation: after the posterior approach to the relevant segment of the spinal column is treated, soft tissue is removed to remove the cortex from the articular surfaces and the vertebral plates, the desired nail point is selected, marked by a burr or marker, and the opening is also drilled with a awl. The size and orientation of the posterior column structure, pedicle and lateral mass were assessed by CT from the sagittal and coronal planes of the pre-operative procedure. The vertebral plate can be partially cut off, the head side and the inner side edge of the vertebral pedicle can be palpated, and the screw feeding point and the screw feeding direction can be determined. In order to facilitate the rod placement, the bent rods are reduced, and the arrangement of the screws on the same straight line on the coronal plane is ensured as much as possible;
2. preparing before drilling: the depth of the drilled hole is determined before drilling, and two drill bit tools of fixed depth and adjustable depth are selected. Placing the drilling guider at the selected nail feeding point, and selecting a drill bit with a proper depth to drill a hole through the guider;
3. detecting the depth of the drilled hole: determining the depth and size of the borehole by using a detector;
4. tapping: a3.5 mm or 4.0mm tap is selected and tapped keeping the same angle, and drilling and tapping of other nail holes are completed in the same way. Removing excess bone for screw placement;
5. implanting a pedicle screw: the screw with the corresponding length is implanted into the vertebral pedicle, the screw is ensured to be vertical and firmly connected to the screw driver, and the screw driver rod keep the same longitudinal axis. Placing the screw in the screw channel, and pushing the screw to advance until the nail head of the screw contacts the bone;
6. adjusting the U-shaped groove: the horizontal displacement of the connecting rod is adjusted by controlling the sliding distance of the U-shaped groove on the screw body, the correct final positions of the U-shaped groove and the connecting rod are judged by an X-ray perspective machine, and then the pressing nail is pressed above the connecting rod for fixing;
7. compression and stabilization: the implanted nail rod is pressurized to ensure that the nerve roots are not affected by the pressurization.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. The pedicle screw comprises a screw seat and a screw body, wherein the screw seat is provided with a U-shaped groove for placing a connecting rod, and the pedicle screw is characterized in that the screw seat is horizontally and slidably connected to the screw body so that the U-shaped groove can be horizontally displaced, and an anti-slipping device is arranged on the screw seat and/or the screw body.
2. The pedicle screw according to claim 1, wherein the screw body comprises an anchoring part with an external thread and a connecting part above the anchoring part, an inverted trapezoidal guide rail is convexly arranged on the connecting part, and a trapezoidal sliding groove matched with the guide rail is arranged at the bottom of the screw seat.
3. The pedicle screw according to claim 2, wherein the length direction of the trapezoidal sliding groove is perpendicular to the opening direction of the two sides of the U-shaped groove.
4. The pedicle screw according to claim 2, wherein the trapezoidal sliding groove is provided with a vertical through hole, the vertical through hole extends for a set distance along the length direction of the trapezoidal sliding groove, the guide rail is provided with a protrusion for being matched with the side wall of the vertical through hole to stop and limit, and the guide rail and the protrusion are separately arranged.
5. The pedicle screw according to claim 4, wherein the lowest end of the U-shaped groove is lower than the upper surface of the trapezoidal sliding groove.
6. The pedicle screw according to claim 1, wherein an internal thread is arranged in the U-shaped groove, and a threaded pressing nail for fixing a connecting rod is connected to the internal thread.
7. The pedicle screw according to claim 2, wherein a vertical first insertion hole is formed in the outer side wall of the U-shaped groove, a plurality of second insertion holes corresponding to the first insertion holes are formed in the upper surface of the guide rail, and the anti-slip device is an insertion column which is arranged in the first insertion hole and the second insertion hole in a penetrating manner.
8. The pedicle screw according to claim 2, wherein the rail is provided with a steel ball top thread at the waist and a transverse groove at the waist.
9. Pedicle screw according to any of claims 2-8, wherein the pitch between lower adjacent threads of the anchoring portion is larger than the pitch between upper adjacent threads.
10. An internal spinal fixation system comprising a pedicle screw and a connector rod, wherein the pedicle screw is according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120004636.9U CN215458525U (en) | 2021-01-04 | 2021-01-04 | Vertebral pedicle screw and spine internal fixation system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120004636.9U CN215458525U (en) | 2021-01-04 | 2021-01-04 | Vertebral pedicle screw and spine internal fixation system with same |
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| Publication Number | Publication Date |
|---|---|
| CN215458525U true CN215458525U (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120004636.9U Active CN215458525U (en) | 2021-01-04 | 2021-01-04 | Vertebral pedicle screw and spine internal fixation system with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115349937A (en) * | 2022-08-02 | 2022-11-18 | 陆宁 | Novel pedicle screw capable of being broken and removed in vivo |
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2021
- 2021-01-04 CN CN202120004636.9U patent/CN215458525U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115349937A (en) * | 2022-08-02 | 2022-11-18 | 陆宁 | Novel pedicle screw capable of being broken and removed in vivo |
| CN115349937B (en) * | 2022-08-02 | 2023-10-20 | 陆宁 | Novel pedicle screw capable of being broken and removed in vivo |
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