KR100915140B1 - Spinal fixation device reinforced breakaway prevention and binding effect - Google Patents

Abstract

The present invention relates to a spinal fixation device that is inserted into the patient through a minimally invasive surgery to fix the spine, more specifically, the frictional force is increased by the engagement structure of the head and the fixed cap portion during the procedure to increase their fastening force and from the outside It can prevent unnecessary tightening force and vibration from shock or vibration of the inner part, and the inner cap part completely surrounding the screw part fixed to the spine is completely fixed to the screw part according to the fastening of the head part and the fixing cap part to control the movement and strengthen the binding force. It relates to a spine fixing device characterized in that the separation prevention and binding strength is enhanced.

The present invention is a conventional spinal fixation device comprising a screw portion, a head portion formed with a rod receiving groove of a size into which the spinal rod can be inserted, and a fixing cap portion; The fixed cap portion is configured to press the spinal rod to fix the position by engaging the female thread of the head portion and the male thread of the fixed cap portion. The female thread includes a head fastening protrusion formed by protruding an end of the female thread mountain peak, and a head protrusion protrudingly formed by the protrusion of the head fastening protrusion; The male thread mountain includes a fixed cap part fastening protrusion formed by protruding the end of the male thread mountain peak in the opposite direction corresponding to the head fastening protrusion, and a fixed cap part protrusion formed concave by the protrusion of the fixed cap part fastening protrusion. In addition, the inner cap portion is composed of a tightening side wall and the pressing end and is inserted into the lower fitting hole of the head portion to surround the spherical joint of the screw portion is configured to tighten the spherical joint by the pressure of the spinal rod to control the movement of the screw portion.

Description

Spinal Fixation Device reinforced breakaway prevention and binding effect

The present invention relates to a spinal fixation device that is inserted into the patient through a minimally invasive surgery to fix the spine, and more specifically, by increasing the frictional force by the engagement structure of the head and the fixed cap portion during the procedure to increase the tightening force and impact from the outside It can prevent unnecessary tightening force and vibration even in vibration or vibration, and the inner cap part surrounding the screw part fixed to the spine is fixed to the screw part to control the movement and strengthen the binding force. Relates to a device.

In general, in the treatment of diseases related to the spine, an indirect treatment method through physical therapy and a direct treatment method for correcting and fixing the spine by attaching a separate fixing device to the damaged spine are performed.

In other words, if the spinal disease is mild, physical therapy is performed, but when the disease is severe in the cervical spine, thoracic spine, lumbar spine, sacrum and intervertebral discs, the spine is treated using a separate spinal fixation device.

The configuration of the spinal fixing device (100a, 100b) that is commonly performed, referring to Figure 1, to correct the damaged vertebrae in a normal state and then fixed without movement, predetermined angle and depth to the pedicle or sacrum of the vertebrae The screw 110 is inserted into the spinal rod 200 is located on one side of the spinal portion, and the spinal rod 200 and the head portion 120 to connect in conjunction with the screw 110.

At this time, the head portion 120 is provided on the upper portion of the screw portion 110 and has a rod receiving groove 121 so that the spinal rod 200 can be positioned, the fixing cap 130 is fastened to the spinal rod ( 200).

For the treatment of the injured spine, the screw 110 of the vertebrae fixing device 100a, 100b is first inserted into the vertebrae or sacrum of the vertebra in an appropriate direction and position, and then the vertebral part is returned to its normal state using the spinal rod 200. Correcting and fixing the spinal rod 200 and the head 120 using the fixing cap 130 to complete the treatment.

At this time, the fixing cap 130 and the head 120 has a structure of the female thread and the male thread to be engaged with each other, the spinal rod 200 is located in the head portion 120 by the engagement of the screw thread. It has a structure that can be fixed tightly without moving.

In other words, the spinal fixation technique using a separate spinal fixation device as a direct treatment method uses spinal orthopedic rods that extend approximately parallel to the spine and are commonly referred to as spine rods. A technique of fixation is referred to, which can be accomplished by exposing the vertebrae posteriorly and inserting the vertebral fixture into the pedicle of the appropriate vertebrae.

In general, two spinal fixation apparatuses are installed per spine, and serve as a fixation point for the spinal rod, and may be classified into two types according to the coupling method of the screw 110 and the head 120.

First, the one is a spinal fixing device 100a in which the head part 120 and the screw part 110 are integrally referred to as a "single shaft fixing device 100a", and the other is required for the procedure. In accordance with the spinal fixing device 100b is made so that the head 120 is rotated accordingly is commonly referred to as "multiaxial spinal fixing device (100b)".

Among them, the "multiaxial spinal fixation device" is typically inserted into the threaded portion 110 formed in the upper part so as not to be separated from the lower end of the head portion 120 through the fixing cap 130 is externally coupled from the top By pressing and fixing the spinal rod 200 is configured to achieve various types of axial form.

However, in the case of such a conventional spinal fixing device (100a, 100b) is a long-term life that is continuously applied by the external force of the fixed cap 130 is applied to the surgical part or the patient's activity after the spinal fixation. The fastening may be loosened by an action such as external force, and thus, there is a problem in that it is difficult to fix the damaged spine because it does not have sufficient coupling force and resistance required to fix the spine.

In addition, when the spinal fixing device is performed, the head part 120 and the fixing cap 130 are tightened by inserting the screw part 110 and using a wrench member that can be inserted into the wrench groove 131 of the fixing cap 130. The screw structure of the head portion 120 and the fixed cap portion 130 having a coupling structure of a general female thread and a male thread is applied downward by using a wrench member, and a lower portion of the head portion 120 is opened by excessive force during the fastening operation. There is a risk of quality, thereby fixing the spinal rod 200 may be released.

On the other hand, the recent spinal fixation device (100a, 100b) is required to miniaturization, in order to meet this demand fixed head portion 130 for coupling the spinal rod 200 and the head portion 120 in the head portion 120 Is screwed into the inside of the head portion 120 and coupled to the inside, thereby preventing the diameter of the head portion 120 from increasing.

However, this also can not completely prevent the action of the external force is a long time after the procedure or there is a problem that the obstacle is fixed to the spine fixed by the fixed cap portion 130 coupled to the inside by the movement of the body is released.

Furthermore, in the case of the "multiaxial spinal fixation device", the spherical joint in the upper part of the screw part is inserted into the head part when the screw part 110 is coupled to the head part 120, and the fixing force is caused by contact friction with the inner surface of the head part by upward pressing force. In order to ensure that, even if the fastening of the fixing cap 130 is relatively stable, there is a problem that a serious obstacle occurs in the fixation of the spine when a slip occurs between the spherical joint and the inner surface of the head.

Even if a member for controlling the movement of the spherical joint is provided, the member does not completely control the movement of the spherical joint, and if the movement of the minute screw 110 occurs after the procedure, the restraint force on the spherical joint is easily weakened, and thus the separation or binding force is reduced. It causes a weakening problem.

In other words, in the case of the conventional spinal fixing device, the screw structure of the head portion 120 and the fixed cap portion 130 having a coupling structure of a general female thread and male thread is the female thread 122 and the fixed cap portion of the head portion 120. The threaded end face of the male thread 132 of 130 has a triangular cross section and is fixed by contact of crests, roots, and flanks with each other. Therefore, the fixing force is weakened and the problem that the fastening force is dropped by the external shock occurs.

In addition, the structure of the conventional spinal column fixing device may not fully control the spherical joint of the screw portion, there is a concern that the binding force may be weakened with the passage of time or the operator's movement.

In addition, such a problem was inconvenient to perform a recombination procedure in a patient who received a procedure using a spinal fixation device, and there was a big problem in which the patient suffered physical pain and mental stress as well as financial and time damages caused by the recombination procedure.

The present invention has been made to solve the above-described problems, even when a strong pressure is applied to the fixed cap portion fastened to the head portion to fix the position of the spinal rod during the operation of the spinal fixing device of the screw structure that meshes the head portion and the fixed cap portion It is an object of the present invention to provide an anti-separation and binding force strengthening spine fixing device configured to prevent the fastening from being released or loosened.

In addition, by forming a fastening protrusion and a projection at the apex of the male and female threads, it prevents the head or the fixing cap from cracking during the fastening process, and increases the contact area and the contact pressure by the fastening of the fastening projection and the projection bone, thereby leaving it. It is an object of the present invention to provide a spinal fixation device with enhanced prevention and binding force.

In addition, the purpose of the present invention is to provide a spinal fixation device in which the inner cap part tightens the spherical joint by the pressing force generated by fastening the spherical joint of the multi-axis spinal fixing device at the upper part and the tightening cap part is tightened. It is done.

The present invention for achieving the above object, the screw portion is inserted into the pedicle or sacrum of the vertebra, the head portion is provided on the top of the screw portion is formed with a rod receiving groove of the size that can be inserted into the spinal rod, In a conventional single-axis spinal fixation device or a multi-axis spinal fixation device including a fixing cap that is fastened to the head to prevent the spinal rod is separated; The head portion is formed inside the top of the rectangular female thread, the fixed cap portion is formed on the outer circumferential surface of the rectangular male thread to be engaged with the female thread, the fixed cap portion along the head portion by the engagement of the female thread and male thread. Configured to pressurize and fix the spinal rod while moving downward; The female thread includes a head part fastening protrusion formed by protruding an end of the female thread mountain peak, and a head part protrusion formed concave by the protrusion of the head fastening protrusion; The male thread mountain includes a fixed cap part fastening protrusion formed by protruding the end of the male thread mountain peak in the opposite direction corresponding to the head fastening protrusion, and a fixed cap part protrusion formed concave by the protrusion of the fixed cap part fastening protrusion.

Accordingly, the contact surface is enlarged by the engagement structure of the head fastening protrusion and the fixed cap protrusion, and the fixed cap fastening protrusion and the head protrusion, and the fixed cap is prevented from being released without being subjected to strong external force and time. It is characterized by.

Meanwhile, the female thread includes a female thread flank having a female thread bottom having a vertical surface and an inclined surface protruding from an end portion of the female thread bottom, and the female thread peak has an end portion of the female thread flank extending downward. To have a vertical plane; The female thread bottom, female thread flank, female thread mountain peak, the head fastening protrusion, the head protrusion protrusion bone is formed in succession.

The male thread mountain includes a male thread flank having a vertical threaded valley having a vertical surface and an inclined surface protruding from an end of the male threaded peak, and the male threaded peak has an end portion of the male threaded flank upward. Extend to have a vertical plane; The male thread peaks, female thread flanks, female thread peaks, head tightening protrusions, head screw bumps to correspond to the male thread peaks, male thread flanks, male thread peaks, fixed cap bumps, fixed cap tightening protrusions Dogs are formed continuously.

In addition, if necessary, the screw portion is further formed with a circular spherical joint formed with a plurality of staples along the outer circumferential surface thereon; The head part has a fitting hole formed at a lower portion thereof, and has an articular accommodating hole in which the spherical joint is inserted into the fitting hole and wraps and tightens the spherical joint according to the engagement of the head part and the fixed cap part. It further comprises a cap portion.

Preferably, the inner cap part has a rod seating bone on which the spinal rod is seated, having a same surface as the '∪' shape surface of the '∪' shaped rod accommodation groove on the head, and surrounding the outer surface of the spherical joint. And a tightening gap constituting a tightening side wall, the tightening side wall and a neighboring tightening side wall, and a pressing end for tightening a lower portion of the spherical joint to an end of the tightening side wall to control movement.

According to the spinal fixation device of the separation and strengthening force in accordance with the present invention as described above, First, the fastening protrusions and protrusions formed on the female thread of the head portion and the fastening protrusions and protrusions formed on the male thread of the fixed cap portion respectively; By the engagement structure there is an effect that can be easily escaped or even loosened even in strong external force and external pressure.

Secondly, the pressure applied during the fastening process prevents cracking of the spinal rod, the head or the fixed cap, and enables fast fastening, while increasing the contact area and the contact pressure fastened by the fastening protrusion and the protruding bone structure, thereby leaving and It is effective to prevent relaxation.

Third, there is an effect that can be fixed stably because the head and the fastening cap that is fastened even in the external force due to continuous activity over a long time is not easily released.

Fifth, the initial position of the first screw part can be secured by interlocking the multistep jaw bone of the inner cap part of the initial procedure with the spherical bone of the spherical joint, and the inner cap part completely wraps around the spherical joint according to the fastening of the fixed cap part to prevent detachment. And it is effective to strengthen the binding force.

Sixth, by fixing the position of the inner cap portion by a support pin fitted in the through hole of the head portion to prevent the separation and accurate binding force can be exhibited.

1 is a perspective view showing a spinal column fixing device according to the prior art.

Figure 2 is a perspective view showing the separation prevention and tightening force strengthening spine fixing apparatus according to the present invention.

Figure 3 is an exploded perspective view showing a separation prevention and strengthening spine fixing device according to the present invention.

Figure 4 is a cross-sectional view showing a separation prevention and tightening force strengthening spine fixing device according to the present invention.

Figure 5 is a schematic diagram showing the fastening of the head portion and the fixed cap portion in accordance with the present invention.

Figure 6 (a) (b) is a perspective cross-sectional view and a partially enlarged view showing the inner cap portion according to the present invention.

Figure 7 (a) to Figure 7 (c) is a view showing a state of use of the separation prevention and tightening force strengthening spine fixing device according to the invention.

*** Explanation of symbols for main parts of drawings ***

1: Spine fixation device with enhanced separation prevention and binding force

200: spinal rod 10: screw

20: head 21: rod receiving groove

22: female thread 23: first side wall

24: second side wall 25: through hole

26: head fastening projection 27: head projection bone

30: fixed cap 31: wrench groove

32: male thread 33: fastening cap fastening protrusion

34: fixed cap projections 40: inner cap

41: tightening side wall 42: push end

43: jamming jaw

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the separation prevention and tightening force strengthening device according to the present invention.

Figure 2 is a perspective view showing a separation prevention and binding force strengthening spine fixing device according to the present invention, Figure 3 is an exploded perspective view showing a separation prevention and binding force is strengthened in accordance with the present invention, Figure 4 Cross-sectional view showing the separation prevention and tightening force strengthening device according to.

In addition, Figure 5 is a schematic view showing the fastening of the head portion and the fixed cap portion according to the present invention, Figure 6 (a) (b) is a perspective cross-sectional view and a partial enlarged view showing the inner cap portion according to the invention, Figure 7 (a) to Figure 7 (c) is a view showing the state of use of the spinal fixing device is enhanced separation and binding force according to the present invention.

As shown, the vertebral fixation device (1) with enhanced separation prevention and binding force according to an embodiment of the present invention, the screw portion 10 is inserted into the pedicle or sacrum of the vertebra and threaded along the outer circumferential surface, and the The head portion 20 and the head portion 20 is provided integrally or separately at the upper end of the screw portion 10 and the rod receiving groove 21 having a size into which the spinal rod (FIGS. 1 and 200) can be inserted. It is configured to include a fixing cap 30 to be prevented from being separated by the external force by being fastened downward by fastening using a wrench member on the top of the).

At this time, when the coupling structure of the head portion 20 and the screw portion 10 is a multi-axis spinal fixation device instead of an integral single-axis spinal fixation device, the screw portion 10 is provided with a spherical joint 11 at the top. On the outer circumferential surface of the spherical joint 11, a plurality of bite bone 11a is preferably formed.

And accordingly, the spinal column fixing device 1 of the present invention is configured to further include an inner cap portion 40 for controlling the movement during the procedure to surround the spherical joint 11 of the screw portion 10.

In addition, the head portion 20 and the fixed cap portion 30 is fastened according to the engagement structure of the female screw thread 22 and the male screw thread 32 respectively formed.

First, the structure of the head portion 20 and the fixed cap portion 30 and its operation relationship will be described with reference to the drawings.

First, referring to FIG. 2, the female screw thread 22 of the head portion 20 has a head portion fastening protrusion 26 and a head portion protrusion projecting from an end portion of a thread, specifically, an end portion of a mountain peak constituting the thread portion. (27) is further formed, the male thread 32 of the fixed cap portion 30, the fixed cap portion fastening protrusion 33 and the fixed cap portion protrusion projecting from the end of the thread, in particular the end of the mountain peak constituting the thread 34 is further formed.

Accordingly, the head portion 20 and the fixed cap portion 30 is fastened by the engagement structure of the female thread 22 and the male thread 32, wherein the head portion projecting bone 27 and the fixed cap portion fastening protrusion ( 33) And the head engaging projection 26 and the fixed cap projections 34 is engaged while being engaged with each other.

In this way, the interlocking structure of the protruding protrusions and the protruding bones makes the head fixing device 1 of the present invention easily shaken or detached from the head part 20 and the fixed cap part 30 even in the external force applied during or after the procedure. It has the effect of not being.

In other words, the screw thread is typically formed to protrude along the inner circumferential surface or outer circumferential surface to be formed, having a spiral shape, and is fixed to the head protrusion 27 when the female thread 22 and the male thread 32 are fastened. Cap part fastening protrusion 33 and the head fastening protrusion 26 and the fixed cap part protrusion 34 is engaged with each other at the point where they are engaged, the role of tightening so as not to deviate from each other even if external force is applied from the top, bottom, left and right. Will be

It extends to the end point of the female thread 22 and the male thread 32 according to the formation of the spiral thread and increases the contact area and the contact pressure of the head portion 20 and the fixed cap portion 30 to increase their separation and relaxation. It can be prevented.

2 and 3 again, the screw portion constituting the vertebral fixation device 1 according to the embodiment of the present invention is threaded on the outer circumferential surface so that it can be inserted into the pedicle or sacrum of the vertebrae. It has a rod-shaped formed, in more detail, the lower end of the screw portion 10 has a conical shape to be easily inserted into the pedicle or sacrum, the upper end of the body diameter is maximized to maximize the final fixing force when inserted It has a structure that can

Such a screw unit 10 may be applied to the spinal fixing device 1 of the present invention as long as it is a structure that can be inserted and fixed in the pedicle or sacrum together with the structure of the general screw unit 10.

The head portion 20 is provided at the upper end of the screw portion 10 according to the structure of the single-axis spinal fixation device or the multi-axis spinal fixation device, and has a cup shape in which the upper part is opened and the lower part is curvature.

At this time, the head portion 20 has a screw thread, that is, a rectangular female screw thread 22 is formed in the upper inner side so that the fixing cap 30 is fastened by the coupling of the screw structure on the upper portion, preferably the female screw thread The end 22 of the female threaded mountain peak protrudes along the direction of forming the female thread, and the head engaging projection 26 is adjacent to the head engaging projection 26 by the protrusion of the head engaging projection 26. It is configured to include a head projection rib 27 is formed concave.

In addition, the head portion 20 is preferably formed in the rod receiving groove 21 of the size that can be inserted into the spinal rod 200, the lower portion of the head portion 20 is the rod receiving groove 21 It is configured to further include a through hole 25 penetrating both sides in communication with).

At this time, the through hole 25 is required to move the spinal fixing device (1) as needed when the spinal fixing device (1) of the present invention is used in the patient, the through holes (both sides) 25) by inserting a separate adjustment mechanism to be used to fine-tune or re-tighten the position of the spinal fixing device (1) using this.

In more detail, the head part 20 is divided into an upper part of the first side wall 23 and the second side wall 24 in which the female thread 22 is formed on the inner side, and the spinal rod 200 is inserted therein. The rod receiving groove 21 is formed to have a '∪' shape, and communicates with the rod receiving groove 21 through a lower side of the first side wall 23 and the second side wall 24. It further comprises a through hole (25).

And, the head portion 20 is in the spinal rod 200 located in the rod receiving groove 21 while sharing the spinal rod 200 with the other head portion 20 of the neighboring spinal fixing device (1) By the pedicle or sacrum of the patient.

On the other hand, the fixing cap 30 is fastened along the female thread 22 of the first and second side walls 23 and 24 at the upper portion of the head portion 20, the rod receiving groove of the head portion 20 By fixing the position of the spinal rod 200 located in the lower direction by pressing downward 21, the fixed cap portion 30 has a rectangular male thread 32 is engaged with the female thread 22 on the outer peripheral surface Is formed.

The fixed cap portion 30 moves downward along the head portion 20, that is, the first and second sidewalls 23 and 24, by engaging the female thread 22 and the male thread 32. Pressing the spinal rod 200 to fix the position.

At this time, preferably, the fixing cap 30 is a position corresponding to the head engaging projection 26 and the head projection rib 27 of the head portion 20, that is, the position that is engaged with each other at the time of fastening the threaded mountain peak An end portion of the fixed cap portion fastening protrusion 33 is formed to protrude in an opposite direction corresponding to the head portion fastening protrusion 26 and the fixed cap portion fastening protrusion 33 is concave adjacent to the fixing cap portion fastening protrusion 33. It is configured to include a fixed cap projections 34 formed.

Accordingly, the head engaging projection 26 of the head portion 20 and the fixed cap portion projecting bone 34 of the fixed cap portion 30 are engaged in the thread fastening process of the head portion and the fixed cap portion, and the head of the head portion. The subprong bone 27 and the fixed cap portion fastening protrusion 33 of the fixed cap portion 30 have a structure that is engaged in the screw fastening process, the head portion 20 and the fixed cap portion 30 by this fastening structure The contact area becomes large.

In addition, as the contact area increases, the contact pressure also increases, so that the fixed cap part 30 is not easily released from the head part 20 even after a strong external force and time elapses, and the spinal rod 200 located in the head part 20 is provided. Press to prevent its release and relaxation.

On the other hand, the fixed cap portion 30 is a square, so that the wrench member, that is to be fastened to the female screw thread 22 formed between the first and second side walls (23, 24) of the head portion 20 by a square wrench, A wrench groove 31 corresponding to the wrench has a screw formed therethrough, that is, a screw shape having a male thread formed on an outer circumferential surface thereof.

Further, preferably, the head fastening protrusion 26 and the fixed cap fastening protrusion 33 have a rectangular cross section so as to widen the contact area and facilitate processing, and the corresponding cap cap protrusion 34 and the head portion corresponding thereto. The protruding valleys 27 also have a rectangular cross section. This widens the contact area in the fastening structure and facilitates the formation of fastening protrusions and protrusion valleys.

More specifically, referring to FIG. 5, the structure of the female thread 22 and the male thread 32 of the head 20 and the fixed cap 30 is as follows.

The female screw thread 22 and the male screw thread 32 are ridges having a uniform cross section protruding from the surface of the inner circumferential surface or the outer circumferential surface of the head portion 20 and the fixed cap portion 30. It has a root, flank.

The female screw thread 22 and the male screw thread 32 protrude in opposite directions so that the ends of each of the highest peaks, that is, the female screw thread peak 22a and the male screw thread peak 32a, may be fastened to each other. Respective fastening protrusions 26 and 33 and protrusions 27 and 34 are formed, respectively.

In more detail, the female thread 22 has a female threaded groove 22b having a vertical surface with respect to a central axis in the direction in which the head 20 and the fixed cap 30 are fastened, and the female threaded groove 22b. An end of the female threaded flank 22c has an extended protruding oblique surface, and the female threaded peak 22a has a vertical surface in which the end of the female threaded flank 22c extends downward.

In addition, the female thread 22, the female thread bottom 22b, the female thread flank 22c, the female thread peak 22a, the head fastening protrusion 26, head head protrusions 27 in order Dogs are formed continuously to form a female thread 22.

On the other hand, the male screw thread 32 is a male screw thread 32b having a vertical surface with respect to a central axis in the direction in which the head portion 20 and the fixed cap portion 30 are fastened, and the male thread screw bottom 32b and the The male threaded flank 32c includes a male threaded flank 32c having an oblique surface protruding from an end of the male threaded bottom 32b, and the male threaded peak 32a extends upward from an end of the female threaded flank 32c. Have

At this time, so that the female thread bottom 22b, female thread flank 22c, female thread peak 22a, head fastening protrusion 26, and head protrusion trough 27 of the female screw thread 22 in order. , The male thread 32 is a plurality of consecutive mountain peaks (32a), male thread flank (32c), male thread bottom (32b), fixed cap projections 34, the fixed cap fastening protrusions 33 in sequence Is formed to form a male thread (32).

Figure 7 (a) to Figure 7 (c) is a view showing the fastening of the spine fixing device (1) to prevent the separation and tightening force in accordance with the present invention, according to Figure 7 (a), the screw portion 10 is Is inserted into the pedicle or sacrum and the fixed cap portion 30 is prepared to be fastened to the head portion (20).

At this time, referring to Figure 7 (b), the rod receiving groove 21 of the head portion 20 is inserted into the rod receiving groove 21 of the adjacent spinal column fixing device 1 spine rod 200 is connected It is placed in the inserted state.

In addition, the fixing cap part 30 of the head part 20 is formed in accordance with the screw coupling structure of the female thread 22 and the male thread 32 so as to press the spinal rod 200 upward to fix the position. Fasten from top to bottom.

In other words, by the engagement of the female screw thread 22 and the male screw thread 32, the fixing cap 30 is formed along the head portion 20, that is, the first and second sidewalls (FIGS. 2, 23, 24). Pressing the spinal rod 200 while moving downward to fix the position.

At this time, the head fastening protrusion 26 of the head female thread 22 is caught on the fixed cap fixed cap protrusion protrusion 34, and the fixed cap fastening protrusion 33 is caught on the head protrusion rib 27 It is fastened according to the coupling structure.

Subsequently, as shown in (c) of FIG. 7, the fixed cap part 30 presses the spinal rod 200 located in the loss accommodation groove 21 from the top so that the spinal rod 200 is not separated from the fixed cap part. The 30 and the head 20 are prevented from being separated or relaxed from each other depending on the structure of the fastening protrusion and the protruding bone formed on the female thread 22 and the male thread 32.

Experimental Example 1

* Experimental method

1. Put the spinal rod on the prepared product and fasten the fixing cap.

2. Measure the upper end of the head in the fastened state.

3. When tightening the fixed cap, torque gauge is used and tightening torque is 12Nm.

4. After tightening with a torque gauge, measure the top dimension of the head.

5. Tighten 23 Nm again using torque gauge.

6. Check the head and the fixing cap for damage.

* product

A: spinal fixation device of the present invention

B: spinal fixing device of the conventional structure 1

C: Spinal Fixation Device 2

<Table 1: Dimensions of head before tightening>

A: 12 mm

B: 13.5 mm

C: 12mm

<Table 2: Dimensions of head part after tightening 12Nm>

product Exam count Head diameter change after tightening (mm) A One 0.04 2 0.06 3 0.04 4 0.07 5 0.05 Average 0.052 B One 0.21 2 0.32 3 0.28 4 0.33 5 0.33 Average 0.294 C One 0.81 2 0.98 3 0.89 4 0.88 5 0.89 Average 0.89

As shown, for product A there is little change in the dimensions of the head and no change means that the initial design value is maintained.

<Picture: Damage after tightening 25Nm>

<A>

<B>

<C>

As shown, in case of A, the original specification is maintained without deformation of the head portion, and in case of B, the head portion is unstable and tightened. Show off

On the other hand, the spinal column fixing device 1 according to the present invention further comprises an inner cap portion 40 to control the movement of the screw portion 10, the structure and operation of the following description with reference to the drawings shown Is the same as

Referring again to Figures 3 and 4, when the anti-separation and binding force strengthening device (1) according to the present invention, when applied to a conventional multi-axis spinal fixing device (1), as described above the screw portion ( 10) is further formed with a circular spherical joint 11 is formed with a plurality of bite bone (11a) along the outer peripheral surface.

In addition, the head portion 20 has a joint accommodating hole 45 of a size that the spherical joint 11 can be inserted into the lower portion, and the head portion 20 and the fixed cap portion 30 are engaged with each other. When the fixed cap portion 30 presses the spinal rod 200, it is further configured to include an inner cap portion 40 which is pushed by the downward pressing force of the spinal rod 200 to wrap around the spherical joint (11).

At this time, the inner cap portion 40 is provided is fitted in the fitting hole 28 penetrated to the lower portion of the head portion 20.

Preferably, the inner cap portion 40 has a cap shape so as to surround the outer circumferential surface of the spherical joint 11 to the end of the spherical joint 11.

4 and 6 (a) (b), the inner cap part 40 has a '∪' shape of the '∪' shape rod receiving groove 21 of the head part 20 on the upper surface thereof. The rod seating bone 44 on which the spinal rod 200 is seated on the same plane as the surface, and a plurality of tightening side walls 41 surrounding the outer surface of the spherical joint 11 and adjacent to the tightening side wall 41. It comprises a tightening gap (a) constituting between the tightening side wall and the pressing end 42 for tightening the lower portion of the spherical joint 11 to the end of the tightening side wall 41 to control the movement.

At this time, the tightening side wall 41 surrounds the outer circumferential surface of the spherical joint 11, the plurality of first multi-stage jaw 41a having the same shape as the bite bone (11a) of the spherical joint 11 on the inner surface This is further formed.

The first multi-stage jaw 41a is the spherical joint 11 when the downward pressure of the spinal rod 200, that is, when the spinal rod 200 is pressed downward in a state seated on the rod seating bone 44. In combination with the bite bone 11a of the tightening side wall 41 is pushed along the inner surface of the fitting hole 28 of the head portion 20 while pressing the spherical joint 11 from the outside to control the movement.

In addition, the tightening side wall 41 forms a tightening gap a with the neighboring tightening side wall 41, and the tightening side wall connects the spherical joint 11 along the inner circumferential surface of the fitting hole 28 of the head part 20. When tightening, easy tightening is possible by the tightening gap (a).

In addition, a plurality of second multi-stage jaw 42a having the same shape as the joint groove 11a of the spherical joint 11 is further formed on the inner surface of the pressing end 42, wherein the tightening side wall 41 Along with the first multi-stepped jaw 41a, the second multi-stepped jaw 42a is engaged with the lower side bite bone 11a of the spherical joint 11 so that the tightening side wall 41 fits the fitting hole 28 of the head 20. The push end 42 which forms the lower end of the tightening side wall 41 while pushing along the inner surface also controls the movement by pressing the spherical joint 11 from the outside to the inside.

Preferably, the pressing end 42 penetrates into the minute gap of the fitting hole 28 of the head portion 20 to tightly tighten the spherical joint 11 and to completely control the movement of the spherical joint 11. Done.

In addition, the inner cap portion 40 of the present invention has a locking jaw 43 is further formed on the outer side to a position corresponding to the through hole 25 of the head portion 20, the support is fitted to the through hole 25 The fine movement is controlled by the pin 50.

On the other hand, the through hole 25 is preferably formed through the head portion 20 to the outside of the forceps hole (25a), and to form a step in the inside of the forceps hole (25a) while the size is further reduced and the support It consists of an inner cap support pin hole 25b into which the pin 50 is inserted.

When the position of the screw portion 10 is determined by the inner cap portion 40 configured as described above during the procedure as shown in FIG. 4, the inner cap portion 40 is fixed at the position by the pressurization of the inner cap portion 40 so as not to move.

7 (a) to 7 (c) again, according to FIG. 7 (a), the screw portion 10 is inserted into the pedicle or sacrum and the fixing cap portion 30 is the head portion 20. While preparing to be fastened to the drawing, the thread part 10 and the inner cap part 40 are shown separately by convenience, but preferably, the screw part 10 is a separate member having a spherical joint 11 formed thereon. The inner cap portion 40 is positioned to be fitted into the fitting hole 28 of the head portion 20 while covering the outer circumferential surface of the spherical joint 11.

7, (b) and 7 (c), the rod receiving groove 21 of the head portion 20 is inserted into and connected to the rod receiving groove 21 of the neighboring spinal column fixing device 1. The spinal rod 200 is positioned in an inserted state, and the spinal rod 200 is urged downward from the upper side by engaging the head 20 and the fixed cap 30.

At this time, the spinal rod 200 is seated on the rod seating bone (FIGS. 4, 44) of the inner cap portion 40, the inner cap portion 40 is pressed downwards from the top, and tightening side wall of the inner cap portion (41) and the pressing end (42) tighten the spherical joint (11) of the threaded portion 10 to prevent movement.

Subsequently, the fixed cap part 30 presses the spinal rod 200 located in the loss accommodation groove 21 from the upper portion so that the spinal rod 200 is not separated from the fixed cap part 30 and the head part ( 20 may be prevented from being separated or relaxed from each other depending on the structure of the fastening protrusion and the protruding bone formed on the female screw thread 22 and the male screw thread 32.

The present invention described above is limited to the above-described embodiment and the accompanying drawings as various substitutions and modifications can be made within a range without departing from the technical spirit of the present invention for those skilled in the art. It doesn't happen.

Claims (11)

A screw portion 10 inserted into the pedicle or sacrum of the vertebra, a head portion 20 formed at an upper portion of the screw portion, and having a rod accommodation groove 21 having a size into which the spinal rod 200 can be inserted; In the conventional spinal fixation device comprising a fixing cap 30 is fastened to the head to prevent the spinal rod is separated from, The head portion 20 has a rectangular female thread 22 is formed in the upper inner side, the fixed cap portion 30 is formed with a rectangular male screw thread 32 is engaged with the female thread 22 on the outer peripheral surface, It is configured to press and fix the spinal rod 200 while the fixed cap portion is moved downward along the head portion by the engagement of the female screw thread 22 and the male screw thread 32; The female thread 22 includes a head fastening protrusion 26 formed by protruding an end of the female thread mountain peak 22a, and a head protrusion protrusion 27 formed concave by the protrusion of the head fastening protrusion. ; The male thread 32 has a fixed cap part fastening protrusion 33 formed by protruding an end of the male thread mountain peak 32a in an opposite direction corresponding to the head part fastening protrusion, and is formed concave by a protrusion of the fastening cap part fastening protrusion. Including a fixed cap protrusion 34; The contact surface is enlarged by the engagement structure of the head fastening protrusion 26 and the fixed cap protrusion protrusion 34 and the fixed cap fastening protrusion 33 and the head protrusion protrusion 27, and the fixed cap portion 30 Does not loosen even after a strong external force and the passage of time is prevented departure; The screw portion 10 is further formed with a circular spherical joint (11) formed with a plurality of bite bone (11a) along the outer peripheral surface at the top; The head portion 20 has a fitting hole 28 penetrated at a lower portion thereof, and has a joint accommodating hole 45 having a size that the spherical joint 11 may be inserted into the fitting hole. According to the engagement of the 20 and the fixed cap portion 30 is configured to further include an inner cap portion 40 to tighten the spherical joint 11; The inner cap portion 40 has a rod seating bone on which the spinal rod 200 is seated on the upper surface having the same surface as the '의' shaped surface of the '로드' shaped rod accommodation groove 21 of the head portion 20 ( 44, a plurality of tightening side walls 41 surrounding the outer surface of the spherical joint 11, a tightening gap a constituting between the tightening side wall 41 and the neighboring tightening side wall, and the tightening side wall 41 Skeleton fixing device is enhanced separation prevention and binding force, characterized in that it comprises a pressing end (42) for controlling the movement by tightening the lower portion of the spherical joint (11) to the end. The method of claim 1, The head portion 20 has a cup shape having an internal space, and the spinal rod 200 is inserted therein while being divided into a first sidewall 23 and a second sidewall 24 on which the female thread 22 is formed. The rod receiving groove 21 is formed to have a '∪' shape, and further comprises a through hole 25 which passes through the lower side of the first side wall and the second side wall and communicates with the rod receiving groove. Spinal fixation device is characterized in that the separation prevention and cohesion is enhanced. The method of claim 2, The fixed cap portion 30 is characterized in that the wrench groove 31 of the size that can be inserted into the square wrench in the upper portion so as to be fastened between the first and second side walls (23, 24) of the head portion Spine fixation device is to prevent separation and strengthen the binding force. The method according to any one of claims 1 to 3, The head fastening protrusion 26 and the fixed cap fastening protrusion 33 has a cross-section has a rectangular shape characterized in that the separation prevention and tightening force reinforced spine fixing device. The method of claim 1, The female thread 22 includes a female threaded bottom 22b having a vertical surface and a female threaded flank 22c having an inclined surface protruding from an end portion of the female threaded bottom and protruding from the female threaded peak 22a. End of the female screw flank extends downward and has a vertical plane, The female screw bottom, female screw flank, female screw mountain peak, head fastening protrusion, head protrusion protrusion bone plural, characterized in that the sequential prevention of separation and tightening force is strengthened. The method of claim 5, The male thread 32 includes a male screw bottom 32b having a vertical surface, and a male screw flank 32c having an inclined surface where an end portion of the male screw bottom extends and protrudes, and the male screw peak 32a. End of the male flank extends upward to have a vertical plane, The male thread peaks, female thread flanks, female thread peaks, head tightening protrusions, head screw bumps to correspond to the male thread peaks, male thread flanks, male thread peaks, fixed cap bumps, fixed cap tightening protrusions Preventing separation and strengthening the spine fixing device, characterized in that the dog is formed continuously. delete delete The method of claim 1, On the inner surface of the tightening side wall 41, a plurality of first multi-stepped jaw 41a having the same shape as the bite bone 11a of the spherical joint 11 is further formed, On the inner surface of the pressing end 42, a plurality of second multi-stage jaw 42a having the same shape as the bite bone (11a) of the spherical joint 11 is characterized in that the separation prevention and binding strength is enhanced Spinal Fixation Device. The method of claim 1, The inner cap portion 40 further includes a locking jaw 43 formed at a position corresponding to the through hole 25 of the head portion 20, and is moved by the support pin 50 fitted into the through hole 25. The spine fixing device is characterized in that the separation prevention and binding strength is controlled. The method of claim 10, The through-hole 25 is characterized in that it comprises a tong hole (25a) formed on the outside and the inner cap support pin hole (25b) to form a step in the inside of the tongs hole, the support pin 50 is inserted Spine fixation device is to prevent separation and strengthen the binding force.