KR200238838Y1 - Spine supporting system - Google Patents

Abstract

The present invention relates to a spinal support system used to correct or fix the spine during spinal surgery in spinal disease.

The spinal support system of the present invention, the rod 40 is securely coupled to the bottom portion of the rod coupling groove 16 of the screw 10 in a state of being always in surface contact or point contact to the specific portion of the rod 40 The shear moment is concentrated to prevent the rod 40 from breaking. In addition, the present invention is formed by inclining the inner surface of the inner cavity 37 of the outer cap 30 and the outer surface of the head 12 of the screw 10 in the upper and lower light beam, so that the insertion of the outer cap 30 to the outer surface of the head 12 is extremely easy. Of course, it is possible to reinforce the upper portion of the head 12 of the weak strength screw 10 by the inclined configuration of the thick outer cap 30, the upper cap 30 and the damage of the head of the screw 10 Can be prevented.

Description

Spinal supporting system

The present invention relates to a spinal support system used to correct or fix the spine in a stable state during spinal surgery in the spinal disease area.

In general, the spinal column of a normal person standing upright is straight in the front, but in the shape of an elongated S-shape. The neck and lumbar spine are slightly forward and the spine is gently curved backwards.

In the human spine, a number of vertebrae are connected by disks to form an S-shaped curve, and one vertebra is composed of a cylindrical vertebra and a posterior arch, which is extended to a pair of pedicles and pedicles. The spinal tube is formed by the upper and lower joints, the vertebral discs and the superficial protrusions, which are extended to the rear, and nerves are located through the spinal canal.

When the disc connecting the vertebrae deforms or ruptures and is displaced from the normal position, or when the joints formed by the lumbar spine are damaged or deformed, the vertebrae deform and displace from the normal position. It is known that pain is caused when external force is applied or compressed to nerves passing through the spinal canal for various reasons.

Therefore, if the spine is maintained in an unstable state as described above will continue to cause pain, so in order to eliminate the pain to decompress the lesion site, when decompression will create an unstable spine to correct the spine stable or Fixing surgery is required.

That is, in a case where a part of the spine is broken or damaged, surgery is performed to support the spine or adjacent spine using the spine support system. The spine support system used in this case is a screw inserted into the upper and lower pedicles of the damaged or adjacent spine to serve as a fixing rod, a rod inserted into each screw, and an inner bolt and an outer cap for fixing the rod to the screw. It is.

1 to 3, the outline of a conventional spinal support system will be described.

1 is an exploded perspective view showing a structure of a conventional spine support system S ', FIG. 2 is a perspective view showing a surgical procedure by a conventional spine support system S', and FIG. 3 is a conventional spine support system S '. It is sectional drawing which shows the surgery state by

In these drawings, reference numeral 10 denotes a screw having a head 14 and a body 14 integrally formed under the head 12, and 20 denotes an inner bolt which is screwed into the head 12 of the screw 10. bolt), 30 is the outer cap to cover the head 12 of the screw 10 to improve the holding power (Holding power) of the inner bolt 20, 40 is the screw 10 to connect the screw 10 The rod is inserted into the head 12 of the.

Head 12 of the screw 10 may be described divided into an inner structure and an outer structure. The inner side of the head 12 is U-shaped for fixing through the internal thread (11) for receiving and screwing the inner bolt 20 and the connecting rod (40) connected and assembled between the spinal support system to be described later. Cap is made of a rod coupling groove 16, the outer cap 30 to the outside to cover the cap to prevent the strength reduction of the entire head 12 due to the formation of the rod coupling groove 16 and to improve the fixing force It consists of an assembly surface 13 and a head block 17, which is a connecting portion formed integrally with the body 14 in the lower portion.

The body 14 of the screw 10 has a long conical shape and a male screw is formed at an outer circumference thereof, and an upper portion thereof is integrally formed with a lower portion of the head 12. And the lower end of the body 14 is formed with a point 18 for insertion into the spine.

The inner bolt 20 has a tool inserting hole 22 into which an assembly tool (driver) is to be inserted into an upper surface thereof, and which may be coupled to the female screw 11 of the screw 10 over the outer circumference thereof. 24) is formed.

The outer cap 30 has an inner cavity 32 to be assembled to the cap assembly surface 13 and an upper surface 34 formed at right angles in cross section on the upper surface.

The rod 40 has a diameter that can be inserted into the rod coupling groove 16 of the screw 10.

The operation of the conventional spinal support system S 'configured as described above will be described with reference to FIGS. 2 and 3. First, briefly describe the general operation process, in the open state by cutting the skin of the area to be operated on the spine and marks the position where the screw will be inserted in the vertical direction with respect to the pedicle of the vertebrae 200, the hole with an awl, etc. To form (drilling operation).

Tapping is performed according to the pitch of the spinal support system in the drill hole, and the spinal support system (exactly the body 14) is driven into the spine using the fastening tool 100 or the like. Then, if the required number of screws 10 are screwed and fixed to the pedicle of the vertebrae 200 in the order described above, bend the rod coupling groove 16 of the head 12 appropriately bent to fit the degree of spinal curvature ( Insert the rod (40) after bending. Subsequently, the inner bolt 20 is rotated several times with the fastening tool 100 set to the female thread 12a of the head 12 to temporarily fix the rod 40 to the screw 10 and the outer cap 30 to the head. Cover the cap assembly surface (13) of (12) and then firmly fasten the inner bolt 20 to secure the rod 40 to the screw 10 and complete the spinal surgery by closing the incision skin.

By doing so, as shown in FIG. 2, the rod 40 is fixed by the inner bolt 20 in the rod coupling groove 16 while the body 14 is firmly embedded in the spine of the patient, and further, the outer cap. By 30, the fixed state of the head 12 in the inner bolt 20 and the screw 10 is more firmly fixed.

However, the following disadvantages and problems occur during the operation by the conventional spinal support system (S ').

1. Breakage problem of the rod 40 due to the line contact state of the rod coupling groove 16 and the rod 40

In spinal surgery using the conventional spine support system (S '), the rod 40 is inserted into the rod coupling groove 16 of the screw 10 by the fastening force of the inner bolt 20 and the containerizing action of the outer cap 30. In some cases, as shown in FIG. 4, the curvature of the rod 40 may be bent incorrectly, but the rod 40 may not be in close contact with the entire bottom of the rod coupling groove 16. You will be excited from one side of the bottom. Therefore, in this state, the rod 40 is in line contact with only the one end portion of the longitudinally coupled end portion of the rod coupling groove 16, so that the shear moment is concentrated at the portion thereof, thereby causing the rod 40 to break. It is a fatal flaw in the system.

2. Difficulties of inserting the outer cap 30 and problems of strength deterioration

Conventional spine support system (S ') is the cap assembly surface 13 of the head 12 by the fastening force of the inner bolt 20 by coupling the inner bolt 20 to the female screw 11 of the screw 10 first. The phenomenon of spreading outward occurs. Therefore, in this case, it is very difficult to insert the outer cap 30 having the same inner diameter as the cap assembly surface 13 into the cap assembly surface 13 of the head 12 and the inner bolt to the female screw 11 of the screw 10. Consideration for reinforcing the strength of the upper end portion of the cap assembly surface 13, which is weak in strength when tightening (20) is not made in the outer cap 30 is damaged the head 12 or outer cap 30 of the screw 10 A problem arises.

The present invention has been devised in consideration of the conventional problems as described above, and its object is to secure the safety of the rod and screw coupling by allowing the rod to be stably coupled to the rod coupling groove of the screw in a surface contact state and the outer cap It is an object of the present invention to provide a spinal support system that can facilitate the insertion of the outer cap and prevent the breakage of the head of the cap and the screw.

1 is an exploded perspective view showing the structure of a conventional spine support system

Figure 2 is a perspective view showing a surgical procedure by the conventional spinal support system

Figure 3 is a cross-sectional view showing a surgical state by the conventional spine support system

Figure 4 is a cross-sectional view of the state in the rod floating in the rod coupling groove in the conventional spine support system

5 is an exploded perspective view showing the structure of the spine support system according to the first embodiment of the present invention;

Figure 6 is a cross-sectional view showing the operation sequence by the spinal support system according to a first embodiment of the present invention

7 is a cross-sectional view of a state in which the curvature of the rod is not accurate in the spine support system according to the first embodiment of the present invention

Figure 8 is an exploded perspective view showing the structure of the spinal support system according to a second embodiment of the present invention

9 is a cross-sectional view showing the operation state by the spinal support system according to FIG.

<Description of the symbols for the main parts of the drawings>

10: screw

11: female thread

12: head

14: Body

16: rod coupling groove

20: inner bolt

26: head

30: outer cap

33: settling groove

35 guide female thread

37: Internal cavity

40: load

50: rod support

100: fastening tool

S, S ', S': Spinal Support System

The spine support system provided in the present invention includes a screw having a head and a conical body having a rod coupling groove formed therein and a female thread formed on an upper inner surface of the rod coupling groove, and being inserted into the rod coupling groove of the screw. Spinal support system including an inner bolt having a male screw on the outer periphery, an outer cap having an inner cavity to cover the head of the screw, and a rod inserted into the rod coupling groove of the screw fixed by the inner bolt and the outer cap In the rod coupling groove, the bottom surface of the rod coupling groove has a shape corresponding to the outer surface of the rod, and the lengthwise direction of the bottom surface of the rod coupling groove is a bow with a central portion disposed upward, so that the rod always faces the bottom of the rod coupling groove. Characterized in that it is to maintain the contact state.

In addition, in the screw, the outer surface of the head is formed in an inclined state of upper and lower light, and the inner cavity inner surface of the outer cap is formed in an inclined state corresponding to the outer surface of the head to facilitate insertion of the outer cap into the outer surface of the head. The upper part of the head is further reinforced by the outer cap, so that the outer cap is firmly coupled to the head of the screw.

Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the drawings.

5 is an exploded perspective view showing the structure of the spinal support system (S) according to the first embodiment of the present invention, Figure 6 is a cross-sectional view showing the operation sequence by the spinal support system (S) according to the first embodiment of the present invention Are shown respectively.

In the description of the present invention, the same reference numerals are given to the same components as in the related art, and only the components different from the conventional components will be described below.

In the present invention, the rod coupling groove 16 formed in the head 12 of the screw 10 has a shape in which the rod coupling groove 16 is cut in the vertical direction, and the bottom surface 16 'of the rod coupling groove 16 is outside the rod 40. The shape corresponding to the surface is the same as before.

However, the rod engaging groove 16 of the present invention has a bow shape in which the longitudinal direction of the bottom face 16 'is arranged upward. Here, the bottom surface 16 'of the rod coupling groove 16 is formed in an arch shape so that the rod 40 contacts the bottom surface 16' of the rod coupling groove 16 even if the curvature of the rod is slightly wrong. This is to maintain the status.

The outer surface 19 of the head 12 of the screw 10, i.e., the cap assembly surface, is formed in an inclined state of upper and lower light.

The inner bolt 20 has a head portion 26 formed to protrude outward from the upper end portion.

The outer cap 30 has a seating groove 33 into which the head 26 of the inner bolt 20 can be inserted, and extends to the inner end of the seating groove 33 so that the guide female screw 35 is formed. The inner bolt 20 is screwed into this guide female screw 35. Here, the guide female screw 35 forms a thread so that the female screw can be formed only 1.5 rotations, that is, 540 degrees of rotation, so that the inner bolt 20 is loosely assembled to the female screw 11 of the screw 10. And the inner bolt 20 is screwed so as not to interfere with the screw assembly centering. In other words, due to the formation of the guide female screw 35, the inner bolt 20 is simply assembled to the outer cap 30 only.

In addition, the outer cap 30 has a semicircular rounding cut portion 36 formed at a portion in contact with the rod 40 so as not to be prevented from being inserted into the outer cap 30 by the rod 40 during the actual operation. In particular, the inner surface of the inner cavity 37 is formed in the inclined state of the upper and lower light so as to correspond to the outer surface 19 of the head 12 in the screw (10).

The operation of the spinal support system of the present embodiment as described above (S) is as follows.

In the spine support system S of the present embodiment, the screw 10 is fixed to the spine as in the related art, and as shown in FIG. 6A, the rod 10 in the rod coupling groove 16 of the screw 10. Insert 40). In this state, the outer cap 30 of the present invention is assembled to the female screw 11 of the head 12. As a matter to be preceded, the inner bolt 20 is temporarily assembled to the guide female screw 35 of the outer cap 30. do. At this time, since the inner bolt 20 only covers the 540 degree portion of the guide female screw 35, a slight flow to the left and right as shown by the virtual line is possible.

When the temporary assembly of the inner bolt 20 and the outer cap 30 is completed, the outer cap 30 is inserted into the head 12 of the screw 10. At this time, the outer cap 30 is formed in the inner cavity 37, the inner surface is inclined to upper and lower light, and the head 12 of the screw 10 is formed to be inclined to the upper and lower light corresponding to the inner surface of the inner cavity 37 of the outer cap 30. Therefore, the insertion of the outer cap 30 into the outer surface of the head 12 is smooth while sliding.

When the outer cap 30 is inserted into the head 12 of the screw 10, as shown in Fig. 6 (B), the inner bolt 20 is tightened using the fastening tool 100 and thus the inner bolt 20 When the inner bolt 20 is fastened to the outer cap 30 while being screwed into the female screw 11 of the screw 10 while being inserted into the rod 40 by the fixing force of the inner bolt 20 is a screw ( 10 is inserted into the rod coupling groove (16).

Further, when the inner bolt 20 is further tightened, as shown in FIG. 6C, the bottom surface of the inner bolt 20 pushes the rod 40 so that the rod 40 is screwed into the rod 1 and the rod coupling groove 16. The head portion 26 of the inner bolt 20 is inserted and seated in the seating groove 33 of the outer cap 30 with tight tightening at the center of the bottom 16 'of the bottom. As such, the inner bolt 20 is screwed into the female screw 11 of the screw 10 head 12 while the inner bolt 20 is completely tightened, and the head 12 is wrapped by the outer cap 30. The rod 40 is firmly fixed to the screw 10 by keeping the mounting groove 33 of the outer cap 30 caught in the head 26 of the inner bolt 20.

As such, the present invention inserts the outer cap 30 into the head 12 of the screw 10 first, and then rotates the inner bolt 20 to automatically insert the rod 40 into the female screw of the head 12. Fix firmly to (10).

Such a surgical procedure is a case where the curvature of the rod 40 is extremely precisely made to fit the surgical environment, or in actual surgery, the curvature of the rod 40 is not exactly correct according to the surgical site or the surgical environment. Do. Even if the curvature of the rod 40 is not exactly matched as shown in FIG. 7, the rod 40 is in surface contact with the arched bottom surface 16 ′ of the rod coupling groove 16. By being coupled there is no fear that the shear moment will be concentrated in any particular portion of the rod 40.

Figure 8 shows an exploded perspective view of the spinal support system (S ') according to a second embodiment of the present invention.

In this embodiment, the bottom longitudinal direction of the rod coupling groove 16 is formed horizontally, and the rod support member 50 is coupled to the center thereof.

The rod support 50 is a fixed portion 51 inserted into and fixed into the bottom of the rod coupling groove 16 and a dome-shaped support portion which is integrally formed on the fixed portion and protrudes above the bottom of the rod coupling groove 16 ( 52).

In this embodiment, even if the curvature of the rod 40 does not match exactly, as shown in FIG. 9, the rod 40 maintains point contact with the upper surface of the support part 52 of the rod support 50. The same effect as in the above can not be expected, but the shear moment is concentrated in any particular portion of the rod 40, it can significantly reduce the phenomenon that the rod 40 is broken.

According to the present invention, the rod is stably coupled to the bottom of the rod coupling groove of the screw at all times in a state of being in surface contact or point contact, thereby preventing the rod from breaking due to concentration of shear moment at a specific portion of the rod. In addition, the present invention forms the inner cavity inner surface of the outer cap and the head outer surface of the screw inclined with upper and lower light, which makes it very easy to insert the outer cap into the outer surface of the head and has a weak strength due to the inclined configuration of the thick outer cap. By reinforcing the upper head of the screw, it is possible to prevent damage to the outer cap and the head of the screw.

Claims (3)

A screw having a rod coupling groove formed on the inner side and a head having a female thread on the upper inner surface of the rod coupling groove and a conical body, and an inner bolt having a male screw on the outer circumference for insertion into the rod coupling groove of the screw; In the spinal support system comprising an outer cap having an inner cavity to cover the head of the screw, and a rod inserted into the rod coupling groove of the screw fixed by the inner bolt and the outer cap, the rod coupling groove 16 The bottom face 16 'has a shape corresponding to the outer surface of the rod 40, and the bottom face 16' of the rod coupling groove 16 has a longitudinal direction in which the center portion is bowed upward. Spinal support system, characterized in that the rod (40) is always in surface contact with the bottom (16 ') of the groove (16). According to claim 1, wherein the outer surface of the head 12 in the screw 10 is formed in the inclined state of the upper and lower light and the inner surface of the inner cavity 37 of the outer cap 30 corresponds to the outer surface of the head 12 Spinal support system, characterized in that formed in an inclined state. According to claim 1, wherein the bottom longitudinal direction of the rod coupling groove 16 is formed horizontally and the rod support 50 is coupled to the center thereof, the rod support 50 into the bottom surface of the rod coupling groove 16 The rod portion 40 is formed integrally on the fixed portion 51 and the dome-shaped support portion 52 protruding upward from the bottom surface of the rod coupling groove 16. Spinal support system, characterized in that to maintain the point always in contact with (52).