CN212308003U - Minimally invasive spine posterior internal fixation pedicle screw - Google Patents

Abstract

The utility model belongs to the field of spinal surgery instruments, in particular to a minimally invasive spine posterior internal fixation pedicle screw, wherein two sides of the pedicle screw tail are provided with a rotatable positive rod device, the bottom of the positive rod device is provided with a rotating shaft, the top of the positive rod device is provided with a fixed polygon prism, the top surface of the fixed polygon prism is provided with a polygon hole, the polygon hole extends downwards to the inside of the positive rod device, the positive rod device is arranged on the pedicle screw tail through the rotation of the rotating shaft at the bottom, and the bottom of the rotating shaft is provided with a supporting spring; a gap is reserved between the rod correcting device and the placing groove along the height direction of the pedicle screw, the height of the fixed polygon prism is less than or equal to the height of the gap, and the height of the rotating shaft is greater than the height of the gap; the rod correcting device also comprises an adjuster, wherein a rod correcting polygonal column of the adjuster is matched with a polygonal hole on the rod correcting device; an adjuster inserting hole penetrating from the top surface to the placing groove is formed in the pedicle screw tail, and a multi-edge counter bore matched with the fixed multi-edge prism is formed in the bottom end of the adjuster inserting hole. The utility model provides high wear excellent success rate has guaranteed operation precision, stability and security.

Description

Minimally invasive spine posterior internal fixation pedicle screw

Technical Field

The utility model relates to a fixed pedicle of vertebral arch nail in way of escape of wicresoft's backbone belongs to spinal surgery apparatus field.

Background

The spine is essential in human physiology for mobility, support and balance. The spine protects spinal nerves, which carry commands from the brain to other parts of the body, and sensory information from nerves below the neck to the brain. In the treatment of human spinal disorders, vertebral body damage is often caused by spinal tumors, tuberculosis, and severe fractures, and when attempting to repair such traumatic injuries, permanent fusion is not the primary goal, which is to reorient the damaged spinal structure to promote bone healing. The stability of the spine needs to be rebuilt, the adjacent vertebrae need to be fixed, and the occurrence of minimally invasive posterior spinal fixation provides an ideal method for treating the diseases.

The pedicle screw is an instrument for minimally invasive spine posterior internal fixation, a handle of a rod holder is parallel to the surface of skin during operation, a connecting rod is perpendicular to the surface of the skin and inserted into the bottom of a U-shaped groove of an open pedicle screw, and the connecting rod penetrates into adjacent pedicle screws on the same side until all the pedicle screws pass through. During earlier stage is fixed, the position of pedicle of vertebral arch nail can be confirmed through X ray perspective computer auxiliary location, and the location is comparatively easy, but during the excellent, the attitude adjustment of connective bar is comparatively difficult, especially when carrying out the operation to the continuous three section of backbone, and the excellent degree of difficulty of penetrating is too big, and the operation degree of difficulty is too high, causes the connective bar very easily not in the U-shaped inslot of second, third pedicle of vertebral arch nail.

After the operation is completed, the locking nut needs to be screwed down, the connecting rod is firmly fixed in the U-shaped groove of the pedicle screw, relative stability and fixation of adjacent vertebral bodies are kept through the connecting rod, and any accidental loosening and displacement mean the change of an operation part, so that the operation failure is caused, and therefore, the fixation of the relative positions of the pedicle screws also becomes the key of successful operation.

The utility model aims to reduce these challenges and reduce the operation difficulty.

SUMMERY OF THE UTILITY MODEL

According to the not enough among the above prior art, the utility model discloses the technical problem who solves is: the defect of the prior art is overcome, the minimally invasive spine posterior internal fixation pedicle screw is provided, the operation is more convenient, the rod penetrating success rate is greatly improved, the operation difficulty is reduced, and the operation precision and stability are ensured so as to solve the problems.

The minimally invasive spine posterior internal fixation pedicle screw comprises a pedicle screw tail and a screw head, wherein the upper end of the screw head is a ball head part, the ball head part is arranged at the bottom end of the pedicle screw tail through a pressing block, the screw head can swing at the bottom end of the pedicle screw tail, the inner side surface of the pedicle screw tail is provided with threads, a locking nut can be screwed in, break grooves are formed in two sides of the pedicle screw tail, rotatable positive bar devices are arranged on two sides of the pedicle screw tail, each positive bar device is an arc-shaped plate, the outer diameter of each arc-shaped plate is the same as that of the pedicle screw tail, placing grooves are formed in two sides of the pedicle screw tail, and the positive bar devices can be embedded into the placing grooves to be attached to the pedicle screw tail; the bottom of the rod correcting device is provided with a rotating shaft, the top of the rod correcting device is provided with a fixed polygonal column, the top surface of the fixed polygonal column is provided with a polygonal hole, the polygonal hole extends downwards into the rod correcting device, the rod correcting device is rotatably arranged on the tail of the pedicle screw through the rotating shaft at the bottom of the rod correcting device, and the bottom of the rotating shaft is provided with a supporting spring; a gap is reserved between the rod correcting device and the placing groove along the height direction of the pedicle screw, the height of the fixed polygon prism is less than or equal to the height of the gap, and the height of the rotating shaft is greater than the height of the gap;

the device also comprises an adjuster, wherein the adjuster comprises a positive rod guide sheet and a positive rod polygon prism, and the positive rod polygon prism is matched with a polygon hole on the positive rod device; an adjuster inserting hole penetrating from the top surface to the placing groove is formed in the pedicle screw tail, and a multi-edge counter bore matched with the fixed multi-edge prism is formed in the bottom end of the adjuster inserting hole.

In minimally invasive posterior spinal fixation, after two or three pedicle screws are screwed into the spinal fixation, the rod holder is used for clamping the connecting rod, the handle of the rod holder is parallel to the surface of the skin, the connecting rod is inserted into the bottom of the U-shaped groove of the open pedicle screw perpendicular to the surface of the skin and penetrates into the adjacent pedicle screws on the same side until all the pedicle screws pass through (as shown in figures 2 and 3). Before the rod is penetrated, the positive rod guide sheet is held, the positive rod polygon prism of the adjuster is inserted into the adjuster insertion hole at the pedicle screw tail and slowly extends into the polygon hole of the positive rod device, the positive rod polygon prism and the polygon hole form matching (as shown in figures 7 and 8), the spring at the bottom of the positive rod device is pressed down by the positive rod polygon prism of the adjuster, at the moment, the fixed polygon prism at the top of the positive rod device is separated from the polygon counter bore at the pedicle screw tail (as shown in figures 9 and 10), the positive rod guide sheet is rotated so as to adjust the opening angle of the positive rod device, at the moment, the adjuster can be slowly drawn out, so that the positive rod devices at two sides form a certain angulation range and are fixed, and the positive rod device is arc-shaped, so that the connecting rod can easily enter the U-shaped groove at the pedicle screw bottom in the rod penetrating process, and the rod penetrating success. After the rod is successfully penetrated, the rod corrector can be reset and embedded and fixed in the placing groove, so that other operations or activities are prevented from being influenced.

Preferably, the positive rod guide sheet is an arc-shaped sheet with the same shape as the positive rod device. The top end of the pedicle screw tail is outside the skin, and the positions of the two bar correcting devices can be intuitively judged according to the positions of the two bar correcting guide plates, so that the angular range of the two bar correcting devices is judged. And in the rod penetrating process, the rod head of the connecting rod can be stirred by swinging the positive rod guide sheet, so that the penetrating angle of the connecting rod is adjusted, and the rod penetrating success rate is further improved.

Preferably, the top surface of the pedicle screw tail is provided with an initial position indicating line, and the initial position indicating line has the same curvature as the positive rod guide piece. When the adjuster is inserted, the positive rod guide piece of the adjuster is aligned with the initial position indication line, so that the accurate position of the positive rod device can be conveniently mastered in the initial position and the rotating process.

Preferably, the depth of the polygonal holes is more than or equal to half of the height of the rod straightening device. The adjuster is prevented from pressing down, and the fixed polygon prism of the rod correcting device is prevented from being separated from the polygon counterbore at the tail of the pedicle screw, so that the rod correcting device is ejected out to the side surface.

Preferably, the bottom surface of the locking nut is provided with a pointed projection. After the operation is finished, the locking nut needs to be screwed down, the connecting rod is firmly fixed in the U-shaped groove of the pedicle screw, and the adjacent vertebral bodies are kept relatively stable and fixed through the connecting rod. In the locking nut screwing process, the pointed protrusions can press a small pit on the surface of the connecting rod to prevent sliding, and the operation success rate is improved.

Preferably, a connecting thin sheet is arranged between the two tail wings of the pedicle screw tail. After the operation is finished, the connecting thin sheet is firstly cut off and taken down, and then the part at the upper part of the pedicle screw tail breaking groove is broken and taken out. The connecting thin sheet plays a role in fixing the two tail wings before the pedicle screw tail is not broken.

Preferably, the nail head is provided with a bone cement hole. Before the bar is penetrated, bone cement can be driven into the bone through the bone cement hole.

Compared with the prior art, the utility model beneficial effect who has is:

the minimally invasive spine posterior internal fixation pedicle screw of the utility model can be directly fixed on the spine of a patient, thereby reducing the influence of spine follow-up generated by physiological respiratory motion on positioning and improving the operation precision; through manual adjustment, the influence of power failure and other emergencies in the operation process on the operation is avoided, so that the safety of the operation is ensured; through setting up positive excellent mechanism, can realize the adjustment to the position and the angle of the connective bar of different vertebra sections, provide the direction for wearing the stick, improved the stick success rate of wearing greatly.

The positive rod mechanism has simple structure, ingenious design and strong production and manufacture performance. The height of the fixed polygon prism is less than or equal to the height of the gap, and the height of the rotating shaft is greater than the height of the gap. When positive excellent mechanism adorned, it was downthehole earlier to put into the bottom with the micro-spring, in the pivot insert hole with positive excellent ware, pushed down the spring, aligned the fixed polygon prism at positive excellent ware top with the polygon counter bore of pedicle of vertebral arch nail tail after, loosened slowly again and let the spring reset, in going into the polygon counter bore on fixed polygon prism top, the fixed polygon prism at top and the pivot effect of bottom made positive excellent ware fixed to the side of pedicle of vertebral arch nail tail. And the depth of the matched multi-edge hole is more than or equal to half of the height of the positive rod device, and in the adjusting and rotating process, the positive rod device is fixed to the side surface of the pedicle screw tail under the action of the positive rod multi-edge at the top and the rotating shaft at the bottom, so that the positive rod device is prevented from popping out to the side surface. Therefore, no matter where the rod correcting device is located, the rod correcting device cannot fall out from the side face of the pedicle screw tail in any state, and the safety of the operation is guaranteed.

Use the utility model discloses carry out the internal fixation art of wicresoft's backbone way of escape, convenient, quick, improve the efficiency of operation. Reducing the challenge in the operation process and reducing the operation difficulty. The operation is more convenient, the rod penetrating success rate is greatly improved, and the operation precision, stability and safety are ensured.

Drawings

Fig. 1 is a schematic view of the opened three-dimensional structure of the rod straightening device of the present invention;

FIG. 2 is one of the schematic views of the surgical installation of the present invention;

FIG. 3 is a second schematic view of the surgical installation of the present invention;

fig. 4 is a schematic perspective view of the rod straightening device of the present invention in an initial position;

fig. 5 is a schematic sectional structure of the present invention;

FIG. 6 is a partial enlarged view of portion A of FIG. 5;

fig. 7 is a partial cross-sectional view of the present invention;

FIG. 8 is a partial enlarged view of portion B of FIG. 7;

fig. 9 is a second partial sectional structural view of the present invention;

FIG. 10 is an enlarged view of a portion of the portion C of FIG. 9;

FIG. 11 is a schematic view of the positive rod and adjuster configuration;

fig. 12 is a schematic perspective view of the utility model after the rod corrector is hidden;

FIG. 13 is an enlarged view of a portion D of FIG. 12;

fig. 14 is a schematic view of the lock nut.

In the figure: 1. pedicle screw tail; 2. a nail head; 3. a rod straightening device; 4. an adjuster; 5. a locking nut; 6. briquetting; 7. a support spring; 8. a connecting rod; 9. the spine;

1.1, breaking the groove; 1.2, connecting the thin sheets; 1.3, placing a groove; 1.4, a multi-edge counter bore; 1.5, inserting an adjuster into the hole; 1.6, an initial position indication line;

2.1, bone cement holes; 2.2, a ball head part;

3.1, fixing the polygon prism; 3.2, multi-edge holes; 3.3, a rotating shaft;

4.1, a positive rod guide sheet; 4.2, a regular-rod polygon prism;

5.1, pointed bulges.

Detailed Description

The invention will be further described with reference to the following examples:

as shown in fig. 1-14, the minimally invasive spine posterior internal fixation pedicle screw of the present invention comprises a pedicle screw tail 1 and a pedicle screw head 2, wherein the upper end of the pedicle screw head 2 is a ball head 2.2, the ball head 2.2 is arranged at the bottom end of the pedicle screw tail 1 through a pressing block 6, the pedicle screw head 2 can swing at the bottom end of the pedicle screw tail 1, the inner side surface of the pedicle screw tail 1 is provided with a thread, a locking nut 5 can be screwed in, the two sides of the pedicle screw tail 1 are provided with breaking grooves 1.1, the two sides of the pedicle screw tail 1 are provided with rotatable positive rod devices 3, each positive rod device 3 is an arc-shaped plate, the outer diameter of each arc-shaped plate is the same as the outer diameter of the pedicle screw tail 1, the two sides of the pedicle screw tail 1 are provided with placing grooves 1.3, and the positive rod devices 3 can be embedded in the placing grooves 1; the bottom of the rod correcting device 3 is provided with a rotating shaft 3.3, the top of the rod correcting device is provided with a fixed polygon prism 3.1, the top surface of the fixed polygon prism 3.1 is provided with a polygon hole 3.2, the polygon hole 3.2 extends downwards to the inside of the rod correcting device 3, the rod correcting device 3 is rotatably arranged on the pedicle screw tail 1 through the rotating shaft 3.3 at the bottom, and the bottom of the rotating shaft 3.3 is provided with a supporting spring 7; a gap is reserved between the rod correcting device 3 and the placing groove 1.3 along the height direction of the pedicle screw, the height of the fixed polygon prism 3.1 is less than or equal to the height of the gap, and the height of the rotating shaft 3.3 is greater than the height of the gap;

the embodiment also comprises an adjuster 4, wherein the adjuster 4 comprises a positive rod guide plate 4.1 and a positive rod polygon prism 4.2, and the positive rod polygon prism 4.2 is matched with a polygon hole 3.2 on the positive rod device 3; an adjuster inserting hole 1.5 penetrating from the top surface to the placing groove 1.3 is arranged on the pedicle screw tail 1, and a multi-edge counter bore 1.4 matched with the fixed polygon prism 3.1 is arranged at the bottom end of the adjuster inserting hole 1.5.

The positive rod guide piece 4.1 of the embodiment is an arc-shaped plate piece with the same shape as the positive rod device 3.

The top surface of the pedicle screw tail 1 of the embodiment is provided with an initial position indication line 1.6, and the initial position indication line 1.6 has the same curvature as the positive rod guide plate 4.1.

The depth of the multi-edge hole 3.2 of the embodiment is more than or equal to half of the height of the rod straightening device 3.

The bottom surface of the locking nut 5 of this embodiment is provided with a pointed projection 5.1.

In the embodiment, a connecting thin sheet 1.2 is arranged between two tail wings of the pedicle screw tail 1.

The nail head 2 of the embodiment is provided with a bone cement hole 2.1.

The multiple ridges in the embodiment are all six ridges.

In the minimally invasive posterior spinal fixation, after two or three pedicle screws are screwed into a spinal column 9 for fixation, a rod holder is used for clamping a connecting rod 8, a handle of the rod holder is parallel to the surface of skin, the connecting rod 8 is inserted into the bottom of a U-shaped groove of an open pedicle screw perpendicular to the surface of the skin, and the connecting rod penetrates into adjacent pedicle screws on the same side until all the pedicle screws pass through (as shown in figures 2 and 3). Before the rod is penetrated, the positive rod guide sheet 4.1 is held, the positive rod polygon prism 4.2 of the adjuster 4 is inserted into the adjuster insertion hole 1.5 of the pedicle screw tail 1 and slowly extends into the polygon hole 3.2 of the positive rod device 3, the positive rod polygon prism 4.2 is matched with the polygon hole 3.2 (as shown in figures 7 and 8), the supporting spring 7 at the bottom of the positive rod device 3 is pressed down by the positive rod polygon prism 4.2 of the adjuster 4, at the moment, the fixed polygon prism 3.1 at the top of the positive rod device 3 is separated from the polygon counter bore 1.4 of the pedicle screw tail 1 (as shown in figures 9 and 10), the positive rod guide sheet 4.1 is rotated to adjust the opening angle of the positive rod device 3, at the moment, the adjuster 4 can be slowly drawn out, so that the positive rod devices 3 at two sides form a certain angle range and are fixed, and the positive rod device 3 is arc-shaped, thereby the connecting rod 8 is easy to enter the U-shaped groove at the bottom of the pedicle screw in the rod penetrating process, and the rod penetrating success rate is improved. After the rod is successfully penetrated, the rod correcting device 3 can be reset and embedded and fixed in the placing groove 1.3, so that other operations or activities are prevented from being influenced.

The top end of the pedicle screw tail 1 is arranged outside the skin, and the positions of the two bar correcting devices 3 can be intuitively judged according to the positions of the two bar correcting guide pieces 4.1, so that the angular ranges of the two bar correcting devices 3 can be judged. And in the rod penetrating process, the rod head of the connecting rod 8 can be stirred by swinging the positive rod guide sheet 4.1, so that the penetrating angle of the connecting rod 8 is adjusted, and the rod penetrating success rate is further improved.

When the adjuster 4 is inserted, the positive rod guide piece 4.1 of the adjuster 4 is aligned with the initial position indication line 1.6, so that the accurate position of the positive rod device 3 can be grasped in the initial position and the rotation process.

The positive rod mechanism has simple structure, ingenious design and strong production and manufacture performance. The height of the fixed polygon prism 3.1 is less than or equal to the height of the gap, and the height of the rotating shaft 3.3 is greater than the height of the gap. When positive excellent mechanism adorns, it is downthehole with the pivot 3.3 insert with positive excellent ware 3 with little spring (supporting spring 7) earlier, push down supporting spring 7, align the fixed polygon prism 3.1 at positive excellent ware 3 top with the polygon counter bore 1.4 of pedicle of vertebral arch nail tail 1 after, loosen slowly again and let supporting spring 7 reset, in will fixing polygon prism 3.1 pushes up polygon counter bore 1.4, the fixed polygon prism 3.1 at top makes positive excellent ware 3 fix the side of pedicle of vertebral arch nail tail 1 with the pivot 3.3 effect of bottom. And the depth of the matched polygonal hole 3.2 is more than or equal to half of the height of the positive rod device 3, in the adjusting and rotating process, the positive rod polygonal column 4.2 at the top and the rotating shaft 3.3 at the bottom act to fix the positive rod device 3 to the side surface of the pedicle screw tail 1, and the positive rod device 3 is prevented from popping out to the side surface. Therefore, no matter where the rod correcting device 3 is located, under any state, the rod correcting device cannot fall out from the side face of the pedicle screw tail 1, and the safety of the operation is ensured.

After the operation is finished, the locking nut 5 needs to be screwed down, the connecting rod 8 is firmly fixed in the U-shaped groove of the pedicle screw, and the adjacent vertebral bodies are kept relatively stable and fixed through the connecting rod 8. In the process of screwing the locking nut 5, the pointed bulge 5.1 can press a tiny pit on the surface of the connecting rod 8 to prevent sliding and improve the success rate of the operation.

The minimally invasive spine posterior internal fixation pedicle screw of the utility model can be directly fixed on the spine 9 of a patient, thereby reducing the influence of spine follow-up generated by physiological respiratory motion on positioning and improving the operation precision; through manual adjustment, the influence of power failure and other emergencies in the operation process on the operation is avoided, so that the safety of the operation is ensured; through setting up positive excellent mechanism, can realize the adjustment to the position and the angle of the connective bar 8 of different vertebra sections, for wearing the stick to provide the direction, improved the stick success rate of wearing greatly. Use the utility model discloses carry out the internal fixation art of wicresoft's backbone way of escape, convenient, quick, improve the efficiency of operation. Reducing the challenge in the operation process and reducing the operation difficulty. The operation is more convenient, the rod penetrating success rate is greatly improved, and the operation precision, stability and safety are ensured.

Claims (7)

1. The utility model provides a minimally invasive backbone way of escape internal fixation pedicle of vertebral arch nail, including pedicle of vertebral arch nail tail (1) and pin fin (2), pin fin (2) upper end is a bulb portion (2.2), bulb portion (2.2) set up in pedicle of vertebral arch nail tail (1) bottom through briquetting (6), pin fin (2) can be in pedicle of vertebral arch nail tail (1) bottom swing, pedicle of vertebral arch nail tail (1) medial surface sets up the screw thread, can twist lock nut (5), pedicle of vertebral arch nail tail (1) both sides are equipped with rupture groove (1.1), its characterized in that: rotatable rod correcting devices (3) are arranged on two sides of the pedicle screw tail (1), each rod correcting device (3) is an arc-shaped plate, the outer diameter of each arc-shaped plate is the same as that of the pedicle screw tail (1), placing grooves (1.3) are formed in two sides of the pedicle screw tail (1), and the rod correcting devices (3) can be embedded into the placing grooves (1.3) and attached to the pedicle screw tail (1); the bottom of the rod correcting device (3) is provided with a rotating shaft (3.3), the top of the rod correcting device is provided with a fixed polygon prism (3.1), the top surface of the fixed polygon prism (3.1) is provided with polygon holes (3.2), the polygon holes (3.2) extend downwards to the inside of the rod correcting device (3), the rod correcting device (3) is rotatably arranged on the pedicle screw tail (1) through the rotating shaft (3.3) at the bottom, and the bottom of the rotating shaft (3.3) is provided with a supporting spring (7); a gap is reserved between the rod correcting device (3) and the placing groove (1.3) along the height direction of the pedicle screw, the height of the fixed polygon prism (3.1) is less than or equal to the height of the gap, and the height of the rotating shaft (3.3) is greater than the height of the gap;

the device is characterized by also comprising an adjuster (4), wherein the adjuster (4) comprises a positive rod guide sheet (4.1) and a positive rod polygon prism (4.2), and the positive rod polygon prism (4.2) is matched with a polygon hole (3.2) on the positive rod device (3); an adjuster inserting hole (1.5) penetrating from the top surface to the placing groove (1.3) is formed in the pedicle screw tail (1), and a polygonal counter bore (1.4) matched with the fixed polygonal column (3.1) is formed in the bottom end of the adjuster inserting hole (1.5).

2. The minimally invasive posterior spinal fixation pedicle screw according to claim 1, wherein: the positive rod guide sheet (4.1) is an arc-shaped sheet bar with the same shape as the positive rod device (3).

3. The minimally invasive posterior spinal fixation pedicle screw according to claim 2, wherein: the top surface of the pedicle screw tail (1) is provided with an initial position indicating line (1.6), and the curvature of the initial position indicating line (1.6) is the same as that of the positive bar guide sheet (4.1).

4. The minimally invasive posterior spinal fixation pedicle screw according to claim 1, wherein: the depth of the multi-edge hole (3.2) is more than or equal to half of the height of the bar correcting device (3).

5. The minimally invasive posterior spinal fixation pedicle screw according to claim 1, wherein: the bottom surface of the locking nut (5) is provided with a pointed bulge (5.1).

6. The minimally invasive posterior spinal fixation pedicle screw according to claim 1, wherein: and a connecting thin sheet (1.2) is arranged between the two empennages of the pedicle screw tail (1).

7. The minimally invasive posterior spinal fixation pedicle screw according to claim 1, wherein: the nail head (2) is provided with a bone cement hole (2.1).

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