KR200370921Y1 - Pedicle Screw System - Google Patents

Abstract

The present invention relates to a spinal fixation system, the spinal fixation system according to the present invention, in the spinal fixation system for maintaining the vertebrae, the first screw portion and the second screw portion formed with a thread, the first screw portion and the first A pedicle screw having an intermediate portion disposed between two screw portions, the pedicle screw being screwed into the vertebra at a predetermined depth; A pair of length members spaced apart from each other at predetermined intervals and at least one opening in which the pedicle screw erected in a slot formed between the pair of length members can enter and exit in the longitudinal direction of the length member are provided. A horizontal member connecting the pair of length members so as to have a plurality of concave grooves continuously disposed along an inner edge portion of the length member and an upper edge of the upper surface of the horizontal member, and the second screw portion is A bone position holding plate having a lower surface in contact with the pedicle screw when disposed in a slot and having a shape complementary to the upper surface of the middle portion; And a screw thread capable of being screwed with the first screw portion, the lower surface of which is in contact with the bone position holding plate when tightened downward along the first screw portion, having a shape complementary to the concave groove of the bone position holding plate. It characterized in that it comprises a nut. Thereby, it can be used for minimally invasive surgery that can minimize the incision of the skin and muscle when performing a surgical operation such as pedicle screw fixation for fixing the vertebrae while having a simple and simple structure.

Description

Spinal Fixation System {Pedicle Screw System}

The present invention relates to a spinal fixation system, and more particularly, to a spinal fixation system for use in surgical operations such as pedicle screw fixation to properly fix the vertebrae.

The human spine consists of the vertebrae and fibrocartilaginous discs (sometimes called discs) between them, which are strengthened by strong ligaments and muscles from the skull to the pelvis, supporting the body and maintaining equilibrium. 1 is a side view of the lumbar spine of a human spine, in which the vertebrae of the lumbar spine 5 have one vertebral body 6, two pedicles 7, and 2. It consists of four intervertebral discs (8), with posterior spines and two transverse and upper and lower joints on both sides. The pedicle 7 is a cylindrical structure that connects the anterior and posterior parts of the spine, and the position and angle thereof are slightly different. As the use of pedicle screws increases in the thoracolumbar region, the importance of the pedicle 7 increases.

On the other hand, pedicle screw fixation refers to a surgical therapy for decompression and fixation of an unstable spine using a screw fixation device to an unstable spondylosis or lumbar dislocation patient. With the development of pedicle screw fixation, minimal spinal segment fixation is possible, and initial stabilization and bony union of the spine can be obtained while reducing external fixation after surgery.

Several spinal fixation systems have been developed for use in surgery to correct and stabilize the spine, such as pedicle screw fixation, and to facilitate spinal fusion. Looking at them, first of all, a spinal fixation system according to a conventional embodiment, in which a bendable rod is longitudinally positioned adjacent to a vertebra column, and the plurality of vertebrae are formed along the length of the vertebrae by a plurality of fastening elements. A spinal fixation system that is secured to the body. Such systems require a variety of fastening elements, such as hooks or bone screws, which are formed to engage certain parts of the spine. During surgery, spinal fixation elements (hooks and screws) are applied to the spine at appropriate anatomical positions. Each fixing element is then coupled to the spinal rod. Through this surgery, anatomical malformations can be corrected and the spine corrected.

Spinal fixation system according to another embodiment of the prior art is disclosed in Korean Patent Publication No. 0228974. The spinal fixation system according to the present embodiment includes a fixing plate having an elongated slot having a plurality of concave grooves formed in an upper surface and a lower surface, and in a pedicle (part of a pedicle, a vertebra). A pedicle screw and nut are provided for transferring the load to the fixed plate. Here, the pedicle screw is provided between the first screw portion coupled to the nut, the second screw portion coupled to the vertebra, and the plurality of concave grooves formed continuously on the lower surface of the fixing plate. An intermediate portion having a complementary rigid upper arched surface. And the nut has a rigid lower arch surface that is complementary to the recess in the top of the fixing plate. This configuration allows the pedicle screw to be inserted into the vertebra and screwed together, and the fixing plate is clamped between the upper arch surface of the pedicle screw and the lower arch surface of the nut to fix the vertebra in the proper position.

However, in the conventional spinal fixation system, since both sides of the fixing plate are closed, when inserting the pedicle screw into the slot of the fixing plate, the fixing plate must be lowered from the upper part of the pedicle screw. Spinal screw systems can be used only for open surgery to incise the entire area of the skin and muscles when performing surgery such as pedicle screw fixation. There was a problem that it is difficult to apply to the minimally invasive surgery that can make the scar as small as possible after the operation.

Therefore, the object of the present invention, in order to solve such a conventional problem, it is possible to minimize the incision of the skin and muscle when performing a surgical operation such as pedicle screw fixation for fixing the vertebrae while having a simple and simple structure To provide a spinal fixation system that can be used for minimally invasive surgery.

1 is a side view showing the side of the lumbar spine of a human spine,

Figure 2 is a perspective view of the bone position maintenance plate of the spinal fixation system according to an embodiment of the present invention,

3 is a cross-sectional view taken along line III-III of FIG. 2;

4 is an exploded side view of the pedicle screw and nut of the spinal fixation system of FIG.

Figure 5 is a side view of the bone holding plate, pedicle screw and nut of the spinal fixation system of Figure 2 coupled,

Figure 6 is an enlarged cross-sectional view of the vertebrae attached to the spinal fixation system,

7 is a view showing a state of use of the fixed plate guide slider of the spinal fixation system according to an embodiment of the present invention,

Figure 8 is a perspective view of the bone holding plate of the spinal fixation system according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: spine fixation system 10: pedicle screw

11: 1st screw part 13: 2nd screw part

15: middle part 16: upper surface of the middle part

20: bone position holding plate 21: length member

22: slot 23: opening

24: horizontal member 25: concave groove

26: upper surface 27: lower surface

30: nut 31: head

32: lower arch surface 33: thread

40: fixed plate guide slider 41: handle

42: guide groove 43: guide

50: plate ring

The object is, according to the present invention, in the spinal fixation system for holding the vertebrae, having a first screw portion and a second screw portion formed with a thread, and an intermediate portion disposed between the first screw portion and the second screw portion, A pedicle screw screwed into the vertebrae with a predetermined depth; A pair of length members spaced apart from each other at predetermined intervals and at least one opening in which the pedicle screw erected in a slot formed between the pair of length members can enter and exit in the longitudinal direction of the length member are provided. A horizontal member connecting the pair of length members so as to have a plurality of concave grooves continuously disposed along an inner edge portion of the length member and an upper edge of the upper surface of the horizontal member, and the second screw portion is A bone position holding plate having a lower surface in contact with the pedicle screw when disposed in a slot and having a shape complementary to the upper surface of the middle portion; And a screw thread capable of being screwed with the first screw portion, the lower surface of which is in contact with the bone position holding plate when tightened downward along the first screw portion, having a shape complementary to the concave groove of the bone position holding plate. It is achieved by a spinal fixation system, characterized in that it comprises a nut.

Here, the bone position maintaining plate, the horizontal member may have a substantially 'U' shape formed by interconnecting one end of the pair of length members.

The bone position maintaining plate may have an approximately 'H' shape in which the horizontal member is formed by interconnecting the central portions of the pair of length members.

In addition, the upper surface of the middle portion is flat, the lower surface of the nut may be an arch surface.

And further comprising at least one plate-shaped ring penetrates the pedicle screw between the bone position plate and the nut to surround the bone position plate to prevent the bone position plate from spreading in the horizontal direction. It is advantageous.

On the other hand, the handle is provided extending from the handle and the bone retaining plate is a sliding guide portion, the bone retaining plate is a sliding movement in the guide portion of the first pedicle screw screwed to the vertebrae It further comprises a fixed plate guide slider for sliding the bone position retaining plate so that the slot is located in the thread portion, the fixed plate guide slider is preferably provided with a guide groove recessed to a predetermined depth from the surface.

Hereinafter, with reference to the accompanying drawings will be described in detail for the subject innovation.

Figure 2 is a perspective view of the bone position plate of the spinal fixation system according to an embodiment of the present invention, Figure 3 is a cross-sectional view taken along line III-III of Figure 2, Figure 4 is a pedicle of the spinal fixation system of Figure 2 Figure 5 is an exploded side view of the screw and nut, Figure 5 is a side view of the bone holding plate, the pedicle screw and the nut of the spinal fixation system of Figure 2 coupled, Figure 6 is an enlarged view of the vertebrae attached to the spinal fixation system It is a cross section. As shown in these figures, the spinal fixation system according to an embodiment of the present invention, the pedicle screw 10 and the plurality of pedicle screw 10 is screwed while being inserted into the vertebra at a predetermined depth position Bone position holding plate (20) for fixing the spine in a proper position by fixing the bone position holding plate 20 between the pedicle screw 10 and screwed to the pedicle screw (10) bone position holding plate The nut 30 fixed to the 20 and the pedicle screw 10 between the bone position holding plate 20 and the nut 30 to prevent the bone position holding plate 20 from spreading in the horizontal direction. Plate-shaped ring 50 is provided.

As shown in detail in FIG. 4, the pedicle screw 10 includes a threaded first screw portion 11 and a second screw portion 12, and a first screw portion 11 and a second screw portion 12. It has the intermediate part 15 arrange | positioned. The first screw portion 11 has a plurality of male threads 12 engaged with the inner thread of the nut 30 and the second screw portion 12 has a thread 14 of helical bone having a blunt end. Thread 14 of the helical bone is engaged with the bone tissue of the vertebrae to which the pedicle screw 10 is screwed. The shape of the thread 14 of the helical bone of the second screw portion 12 can of course be configured in a variety of shapes and sizes. The intermediate portion 15 has a first screw portion 11 and a second screw portion 12 between the first screw portion 11 and the second screw portion 12 to define the first screw portion 11 and the second screw portion 12. It is formed integrally with. In this embodiment, the middle portion 15 has a flat surface of the upper surface 16, as can be seen in Figure 6, when the pedicle screw 10 and the bone positioning plate 20 is coupled to the pedicle screw The lower surface 27 of the bone positioning plate 20 which is in contact with the upper surface 16 of the middle portion 15 of (10) is also flat. However, if necessary, the upper surface 16 of the middle portion 15 may have an arched surface, and at this time, the lower surface 27 of the bone retaining plate 20 may have an upper arch surface of the middle portion 15. Naturally, a plurality of lower recessed grooves may be formed at regular intervals so as to be in contact with each other.

Meanwhile, in order to insert the pedicle screw 10 into the vertebra, the bone of the female screw is applied to the vertebra using a screw tab. The corrugated thread can be made in each level of the spinal column to which the spinal fixation system 1 is fixed. The pedicle screw 10 may be screwed into the ribbed bone by using a suitable screw tool coupled to the hexagonal cavity at the end of the pedicle screw 10. When the pedicle screw 10 is screwed to the bone to the predetermined predetermined depth and the bone position retaining plate 20 is installed, the upper surface 16 of the middle portion 15 of the pedicle screw 10 is boned. In contact with the lower surface 27 of the positioning plate 20, the bone positioning plate 20 is disposed between the projections of the vertebrae as shown in FIG.

The bone position retaining plate 20 shown in detail in FIGS. 3 and 4 includes a pair of length members 21 and a slot formed between the pair of length members 21 which are arranged to face each other at a predetermined interval. Horizontal member connecting the pair of length members 21 so that at least one opening (23) is provided in the longitudinal direction of the length member 21 in the state in which the pedicle screw 10 is upright (22) ( 24 and a plurality of concave grooves 25 and 28 disposed continuously along the inner edge portion of the inner edge portion of the upper surface 26 of the length member 21 and the horizontal member 24. In the present embodiment, the bone position maintaining plate 20 has a substantially 'U' shape formed by connecting the horizontal member 24 to one end of the pair of length members 21. The plurality of concave grooves 25 have substantially the same size on the length member 21, but the concave grooves 28 on the horizontal member 24 are larger in size than the concave grooves 25 on the length member 21. This is large in order to have a complementary shape with the lower arched surface 32 of the nut 30 disposed in the slot 22 so that it can be properly engaged. The bone position retaining plate 20 has an opening 23 in the longitudinal direction of the length member 21 so that the pedicle bone retaining plate 20 is pedicle when the pedicle screw 10 is coupled to the vertebrae. The pedicle screw 10 may be placed in the slot 22 of the bone holding plate 20 by moving in the lateral direction of the screw 10. This structure is a structure that allows minimally invasive surgery to be described in more detail, to form a hole of a predetermined size through the skin, muscle and vertebrae in the position to fix the pedicle screw 10 to the vertebrae The pedicle screw 10 is screwed into the vertebrae through the hole, and then the bone position retaining plate 20 is inserted through the hole formed in the skin and muscle, and crosses the pedicle screw 10 under the skin and muscle. Direction laterally so that the pedicle screw 10 is positioned in the slot 22 of the bone position holding plate 20, and then the pedicle screw 10 is fastened with the nut 30 to hold the bone position holding plate ( 20) It is possible to fix the minimally invasive surgery to minimize the incision of the skin and muscles is possible.

The nut 30 has a head portion 31 having a hexagonal head shape that can be engaged by a tightening tool such as a wrench, and a concave groove 25 continuously disposed on the upper surface 26 of the bone position holding plate 20. A lower arch surface 32 having a shape complementary to 28) and an internal female screw 33 for engaging the pedicle screw 10. Here, the diameter of the lower arch surface 32 is preferably the same as the diameter of the concave groove 25 of the upper surface 26 of the bone positioning plate 20. The nut 30 is tightened downward along the second screw portion 12 until the lower arch surface 32 engages with the recess 25 in the upper surface 26 of the bone retaining plate 20. The cooperative action of the lower arch surface 32 of the nut 30 and the concave groove 25 of the upper surface 26 of the bone retaining plate 20 makes the joining secure and the pedicle screw 10 is vertebral column. Even when receiving a load from the bone position maintaining plate 20 is not separated along the length.

As shown in FIGS. 5 and 6, if necessary, the plate-shaped ring 50 is mainly penetrated by the pedicle screw 10 proximate to the opening 23, between the nut 30 and the bone retaining plate 20. It is installed in the shape of 'U'. The plate-shaped ring 50 installed in an inverted state in the 'U' shape is fixed between the nut 30 and the bone positioning plate 20 while surrounding the bone positioning plate 20 so that the bone positioning plate 20 is long. It is prevented from spreading in the horizontal direction of the member 21.

7 is a view showing the state of use of the fixed plate guide slider of the spinal fixation system according to an embodiment of the present invention, as shown in the spinal fixation system 1 according to an embodiment of the present invention bone position The holding plate 20 slides and moves so that the slot 22 of the bone holding plate 20 is positioned in the first screw portion 11 of the pedicle screw 10 screwed to the vertebrae. It is further provided with a fixed plate guide slider 40 for sliding guide. The fixed plate guide slider 40 is provided with a handle 41, a guide portion 43 extending from the handle 41 and the bone holding plate 20 is slidably movable, and a guide groove formed with a predetermined depth recessed from the surface. 42). In this configuration, the bone positioning plate 20 is easily slid through the hole cut into the skin and the muscle by the fixing plate guide slider 40 to maintain the bone position of the first screw 11 of the pedicle screw 10. It can be accommodated in the slot 22 of the plate 20.

8 is a perspective view of a bone position plate of the spinal fixation system according to another embodiment of the present invention, as shown in the spinal fixation system according to another embodiment of the present invention is a spinal fixation according to the above-described embodiment The bone position holding plate 20a is different compared to the system, and the bone position holding plate 20a has an approximately 'H' shape in which the horizontal member 24a is formed by interconnecting the central portions of the pair of length members 21a. different. Components corresponding to the above-described embodiment are indicated by adding 'a' to the same reference numerals. In the present embodiment, openings 23a are formed at both ends thereof, so that the pedicle screw ( There is an advantage that can be inserted). The remaining detailed description of the present embodiment will be omitted since it is duplicated.

By such a configuration, the method of using the spinal fixation system according to the present invention will be described.

First, a female screw is boned into the vertebrae using a screw tab, and the pedicle screw 10 is inserted at an appropriate position of the vertebrae through the second threaded portion 12 of the plurality of pedicle screws 10. Of the pedicle screw 10 is properly aligned. At this time, minimally invasive surgery is performed, in which only the minimum necessary area is incision is made without cutting all the skin and muscles. Then to the guide groove 42 of the fixed plate guide slider 40 which is placed in contact with the pedicle screw 10 through the holes of the skin and muscles already cut to screw the pedicle screw 10 to the vertebrae. The bone positioning plate 20 is slid to insert the slot 22 of the bone positioning plate 20 to receive the first screw portion 11 of the pedicle screw 10. At this time, the bone positioning plate 20 is inserted. Of course, the portion where the opening 23 is formed must be inserted first. When the first screw portion 11 of the pedicle screw 10 is received in the slot 22 of the bone holding plate 20, the lower arch surface 32 of the nut 30 is opened through the cut holes of the skin and muscles. The nut 30 is screwed down from the first screw portion 11 so as to be received in the concave groove 25 of the upper surface 16 of the bone position holding plate 20 so that each pedicle screw 10 is held in the bone position holding plate. It is fixed at the proper position of 20 so that the vertebrae are also fixed at the proper position. At this time, the pedicle screw adjacent to the opening 23 in order to prevent the bone position retaining plate 20 from spreading in the horizontal direction of the length member 21 by tightening the pedicle screw 10 and the nut 30. 10, the screw 30 is first inserted into the plate-shaped ring 50 before screwing the pedicle screw 10 to surround the bone position retaining plate 20.

In the above-described embodiment, the lower surface 27 of the bone positioning plate 20 is flat and the upper surface 16 of the pedicle screw 10 having a complementary shape is also described above, but the bone positioning plate The lower surface 27 of the (20) is configured so that a plurality of lower surface concave grooves are arranged continuously and the upper surface 16 of the pedicle screw 10 is complementary to that shape, that is, the lower portion of the bone retaining plate 20 Naturally, it can be configured to have the shape of an upper arch surface that can engage the concave groove.

In addition, in the above embodiment, the spinal fixation system has been described above that the plate-shaped ring 50 surrounding the circumference of the bone retaining plate 20, but the bone retaining plate 20 is the pedicle screw 10 If the phenomenon does not occur in the transverse direction of the length member 21 by the tightening of the nut 30 and the plate-shaped ring 50 may not be installed, of course.

As described above, according to the present invention, a simple and simple structure can be used for minimally invasive surgery that can minimize the incision of the skin and muscles during surgical operations such as pedicle screw fixation for fixing the vertebrae. So that one spinal fixation system is provided.

Claims (6)

In the spinal fixation system for maintaining the vertebrae, A pedicle screw having a first threaded portion and a second threaded portion formed therein and an intermediate portion disposed between the first and second screw portions, the screw being screwed into the vertebra at a predetermined depth; A pair of length members spaced apart from each other at predetermined intervals and at least one opening in which the pedicle screw erected in a slot formed between the pair of length members can enter and exit in the longitudinal direction of the length member are provided. A horizontal member connecting the pair of length members so as to have a plurality of concave grooves continuously disposed along an inner edge portion of the length member and an upper edge of the upper surface of the horizontal member, and the second screw portion is A bone position holding plate having a lower surface in contact with the pedicle screw when disposed in a slot and having a shape complementary to the upper surface of the middle portion; And A screw thread which is screwable with the first screw portion is formed, and a nut having a shape complementary to the concave groove of the bone position retaining plate has a lower surface contacting the bone position retaining plate when tightened downward along the first screw portion. Spinal fixation system comprising a. The method of claim 1, The bone position maintaining plate, the horizontal member is a spinal fixation system, characterized in that the substantially 'U' shape formed by interconnecting one end of the pair of length members. The method of claim 1, The bone position maintaining plate, the horizontal member is a spinal fixation system, characterized in that the substantially 'H' shape formed by interconnecting the central portion of the pair of length members. The method of claim 1, The upper surface of the middle portion is flat and the lower surface of the nut is an arched surface. The method of claim 1, And at least one plate-shaped ring penetrating the pedicle screw between the bone position plate and the nut to surround the bone position plate. The method of claim 1, A handle and a guide portion extending from the handle and the bone position retaining plate is slidably movable, wherein the bone position retaining plate is slidably moved from the guide to a first screw portion of the pedicle screw screwed to the vertebrae. And a fixed plate guide slider configured to slide the bone position retaining plate so that the slot is positioned, wherein the fixed plate guide slider is provided with a guide groove recessed to a predetermined depth from a surface thereof.