WO2015137688A1 - Screw assembly for spinal implant - Google Patents

Abstract

The present invention relates to a screw assembly for a spinal implant comprising: a first unit which has an inner space formed therein and is vertically penetrated, and which has an insertion groove that is formed by cutting from the edge of the upper end so that the sides face each other and the lower end has an arc-shape; a rod which has the outer peripheral surface on one side seated in the insertion groove, and the outer peripheral surface on the other side seated in an insertion groove in a first unit which is neighboring the first unit; a second unit which has the upper part rotatably accommodated in the lower part of the inner space, and the lower part screw-coupled with a vertebral body constituting a spine and fixed so as to prevent loosening; a third unit which is screw-coupled in the upper part of the inner space so as to fix the rod; and a fourth unit which is disposed between the inner space and the upper part of the second unit so as to limit the rotation of the second unit. The present invention enables surgical procedure to be customized to various body shapes of patients, and the installation angle and location to be freely adjusted while the installed state is firmly maintained.

Description

Screw assembly for spinal implant

The present invention relates to a screw assembly for a spinal implant, and more particularly, to a screw assembly for a spinal implant that allows the maintenance of a stable and freely adjustable angle and position to be installed and installed according to various body types of a patient. .

The spine is a part that supports the body, and is usually composed of 24 bones, and a disk is provided between the bones adjacent to the bone, and the nerve is passed through the center of the bone.

The spine not only supports the body, but also functions as a source from which the body can move.

When the spine is damaged due to an accident, the degenerative disease progresses with age, or when the spine is damaged or distorted, the buffering disk is compressed between the vertebral bodies. It is also compressed, causing severe pain.

In case of minor pain, physical therapy is used. However, in case of severe pain, a fixation device for fixing the vertebrae should be inserted to correct the position of the vertebrae or to fix the pressure on the nerve.

The fixing device for fixing the spine inserts a plurality of screws into the vertebrae and the vertebrae adjacent to the vertebrae, and installs a rod to connect the inserted screws to each other to fix the vertebrae or correct the deformed vertebrae.

However, the conventional fixing device for fixing the spine has a problem that the screw fixed to the vertebrae is reversed and dislodged due to the action of external force, etc. applied to the patient's continuous activity.

In particular, since the patient needs to undergo a re-treatment, the recovery is delayed and the additional treatment time is increased, so that the patient is faced with a fatal problem that aggravates pain.

[Preceding technical literature]

[Patent Documents]

Korea Patent Registration No. 10-0509885

Korea Patent Registration No. 10-1056119

The present invention has been invented to improve the above problems, to provide a screw assembly for a spinal implant that allows the maintenance of a stable state of the procedure while being free to adjust the angle and position to be installed and installed in accordance with various body types of the patient. It is for.

In order to achieve the above object, the present invention includes a first unit which is cut while facing each other from the edge of the upper end has an insertion groove of the lower end is arc-shaped, and forms an inner space and penetrates up and down; A rod on which the outer circumferential surface of one side is seated in the insertion groove, and the outer circumferential surface of the other side is seated on the insertion groove of the first unit adjacent to the first unit; An upper part of which is rotatably received at a lower side of the inner space, and a lower part of which is screwed and fixed to the vertebral body constituting the vertebra; A third unit screwed to an upper side of the inner space to fix the rod; And a fourth unit disposed between the inner space and an upper portion of the second unit to limit the rotation of the second unit.

According to the present invention having the above configuration, the following effects can be achieved.

First, the present invention is excellent in terms of versatility because it can vary various procedures and installation angles according to the age, body type or disease degree of the patient from the structure including the second unit rotatably coupled to the first unit. Do.

In addition, the present invention is a second unit due to the external force generated by various operations of the patient from the structure including a second unit screwed and fixed to the pedicle to prevent loosening and the fourth unit for limiting the rotation of the upper side of the second unit The lower side of the pedicle can be prevented from escaping, and it will be able to maintain a solid state of treatment.

1 is an exploded perspective view showing the overall configuration of the screw assembly for spinal implant according to an embodiment of the present invention

Figure 2 is a cross-sectional conceptual view showing the overall configuration of the screw assembly for spinal implant according to an embodiment of the present invention

3 is an enlarged view of a portion A of FIG. 2;

4 is an enlarged view of a portion B of FIG. 2;

Figure 5 is a perspective view showing the structure of the pressing ring of the fourth unit of the main portion of the screw assembly for spinal implant according to an embodiment of the present invention

Figure 6 is a cross-sectional conceptual view showing the head structure of the screw assembly for spinal implant according to an embodiment of the present invention

Figure 7 is a cross-sectional conceptual view showing the head structure of the screw assembly for spinal implant according to another embodiment of the present invention

8 is a conceptual front view showing the overall configuration of the screw assembly for spinal implant according to another embodiment of the present invention

9 is a conceptual view showing a state in which the screw assembly for spinal implants in accordance with an embodiment of the present invention to the spine

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

In this specification, the embodiments are provided so that the disclosure of the present invention may be completed, and the scope of the present invention may be completely provided to those skilled in the art to which the present invention pertains. It is only defined by

Thus, in some embodiments, well known components, well known operations and well known techniques are not described in detail in order to avoid obscuring the present invention.

In addition, the same reference numerals throughout the specification refer to the same components, and the terminology (discussed) used herein is for the purpose of describing the embodiments are not intended to limit the invention.

As used herein, the singular forms "a", "an" and "the" include plural unless the context clearly dictates otherwise, and the elements and acts referred to as 'comprises' or 'do' not exclude the presence or addition of one or more other components and acts. .

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art.

In addition, the terms defined in the commonly used dictionary are not ideally or excessively interpreted unless they are defined.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is an exploded perspective view showing the overall configuration of the screw assembly for a spinal implant according to an embodiment of the present invention, Figure 2 is a cross-sectional conceptual view showing the overall configuration of a screw assembly for a spinal implant according to an embodiment of the present invention.

3 is an enlarged view of portion A of FIG. 2, and FIG. 4 is an enlarged view of portion B of FIG. 2.

At this time, Figure 5 is a cross-sectional conceptual view showing the head structure of the screw assembly for spinal implant according to an embodiment of the present invention.

As shown in the present invention, the rod 500 is seated on the first unit 100, the rod 500 is fixed to the third unit 300, and the upper portion of the second unit 200 allows rotation. While being accommodated in the first unit 100, the fourth unit 400 can be understood that the configuration to maintain a robust treatment state by limiting the rotation of the second unit 200 when the procedure is completed.

The first unit 100 is a member which is cut while facing each other from the upper edge and has an insertion groove 101 having an arcuate shape at the lower end, and forms an inner space 102 and penetrates up and down.

The rod 500 has an outer circumferential surface of one side mounted on the insertion groove 101 and an outer circumferential surface of the other side of the rod 500 of the first unit 100 adjacent to the first unit 100.

The second unit 200 has an upper portion pivotably received at a lower side of the inner space 102 and the lower portion vertebral body 710 constituting the vertebrae 700 (see FIG. 8 below). It is fixed to both sides of the).

The third unit 300 is screwed to the lower side of the inner space 102 to fix the rod 500.

The fourth unit 400 is disposed between the inner space 102 and the upper portion of the second unit 200 to limit the rotation of the second unit 200.

Therefore, the present invention can be said to maintain the interval between the vertebrae 710 and the neighboring vertebrae 710 so that the pain caused by nerve compression can be alleviated.

That is, the first unit 100 and the first unit 100 separate from each other, the second unit 200 provided in each of the first unit 100 is inserted into the vertebral body 710 and the rod 500 ) Maintains a distance between the first unit 100 and the neighboring first unit 100.

The present invention can be applied to the above embodiments, and of course, the following various embodiments are also applicable.

As described above, the first unit 100 accommodates the rod 500, and it can be understood that the first unit 100 includes a head 110, a second threaded part 120, and a first ring step 130.

The head 110 is formed so that the insertion groove 101 is opposed to each other from the upper edge, the inner space 102 is formed.

The second screw portion 120 is formed along the upper inner circumferential surface of the head 110 and is coupled to the first screw portion 310 having a round screw shape formed on the outer circumferential surface of the third unit 300. .

The first ring step 130 is formed to be stepped along the lower inner circumferential surface of the head 110 so that the lower portion of the outer surface of the fourth unit 400 is locked.

On the other hand, the third unit 300 may further include a support (600, see Figs. 1 and 2 below) is formed extending from the upper side, provided in pairs to face each other.

In order to fasten and fix the second unit 200 coupled to the first unit 100 to the spine 700 of the patient, the operator fixes the third unit 300 to one end of a power tool (not shown). Place it in a position to fasten and secure to the spine (700).

The support 600 is for preventing the third unit 300 from falling out of the treatment tool and falling into the patient's body due to the carelessness of the operator.

After the operator fastens and fixes the screw on the spine of the patient, the lower end of the support 600 is formed to have a thin thickness so as to easily remove the unnecessary support 600.

Looking in more detail with respect to the support 600, a support body 610 (see Fig. 2 below) formed in a pair to face the upper side of the third unit 300, the lower end of the support body 610 and the third unit ( It is a structure including a connecting piece 620 interconnecting the upper surface of the 300.

In other words, the lower end of the support 600 is the lower end of the support main body 610, the portion that can be easily cut and removed by forming a thin thickness is the connection piece 620.

That is, the support 600 is extended from the upper side of the third unit 300 to be tightly fixed to the power tool is removed after fastening the third unit 300 with the power tool, to provide a convenience to the operator It can be called a technical means.

On the other hand, the screw assembly for spinal implant according to an embodiment of the present invention, the first screw portion 310 having a round screw shape formed on the outer peripheral surface of the third unit 300, and the internal space 102 of the first unit 100 It is formed along the upper inner circumferential surface of the, and includes a second screw portion 120 having a round screw shape that is fastened to the first screw portion (310).

In this case, the round screw-shaped threads constituting the first and second threads 310 and 120 may be inclined upward with respect to the first virtual line ℓ1 penetrating through the center portion in the vertical length direction of the first unit 100, respectively. Can be.

That is, although the above-described threads may be general threads, the first thread 310 may be formed in the first unit 100 so that it is easy to insert the third unit 300 into the first unit 100 at first. 2 can be referred to as a technical means for being accurately guided to the screw 120 to be driven by screwing while rotating.

More specifically, the second virtual line (L2) with respect to the second virtual line (L2) passing through the center of the screw bone of the first screw portion 310 or the second screw portion 120 and orthogonal to the first virtual line (L1). The first inclination angle θ1 formed by the upper thread and the second imaginary line ℓ2 is the same as the second inclination angle θ2 formed by the thread and the second imaginary line ℓ2 under the second imaginary line ℓ2. In general, the first inclination angle θ1 is preferably larger than the second inclination angle θ2.

The first inclination angle θ1 is in the range of 3 ° to 9 °, and the second inclination angle θ2 is in the range of 3 ° to 9 °.

The configuration of the first screw part 310 and the second screw part 120 has an effect of closely contacting the third unit 300 to which the third unit 300 is fastened and fixed to the first unit 100 so as to pressurize the first unit further. have.

In addition, the configuration of the above-described first screw portion 310 can be better understood in Figure 3 (a), as described above, the first screw portion 310 may be formed to be inclined upward with respect to the second virtual line (L2). Of course, as shown in (b) of FIG. 3 (b) orthogonal to the second virtual line (L2), that is, orthogonal to the first virtual line (L1) passing through the central portion in the vertical direction of the first unit 100. It is a matter of course that a general structure may be adopted to form a structure.

On the other hand, the second unit 200 is to allow the rotation and determine the installation angle and to maintain a solid installation and treatment state to fit the various body types of the patient as described above, fastening with the ball joint head 210 It can be seen that the structure including the unit 220.

First, as shown in FIG. 7, the center point P passing through the center of the virtual circle extending upward from the lower outer surface of the ball joint head 210 may be defined.

Here, the first radius R1 that extends from the center point P to the end of the first locking pattern 211 to be described later formed of a plurality of protrusions formed in a circumferential shape on the upper outer surface of the ball joint head 210 is the center point ( It may be formed smaller than the second radius (R2) extending from P) to the lower outer surface of the ball joint head 210.

The first radius R1 may be larger than the third radius R3 extending from the center point P to the concave portion between one of the plurality of protrusions and the neighboring protrusion.

That is, the ball joint head 210 is accommodated in the internal space 102 of the first unit 100 and fixed to the fourth unit 400 in the upper and lower portions thereof, and has a constant rotational angle θ3 (see FIG. 6 below). It is excellent in terms of versatility because it allows various rotations within the range of) while varying the angle of treatment and installation depending on the age, body type, or degree of disease of the patient.

Here, the ball joint head 210 may be manufactured in a circular or elliptical cross section cut flat.

In addition, the ball joint head 210 is a ring-shaped protrusion and grooves that are concentric toward the lower end side from the center of the upper end of the ball joint head 210 in order to maintain a firm fastening state with the fourth unit 400 to be described later It is preferable to further provide the 1 locking pattern 211. Therefore, the first locking pattern 211 is coupled to the fourth unit 400 to limit the rotation of the ball joint head 210.

In addition, the fastening part 220 extends from the lower side of the ball joint head 210, and the incision groove 223 is formed by cutting a part of the thread 221, and the fastening part 220 reversely rotates. It is to prevent that.

That is, when the fastening part 220 is inserted and fixed to the vertebral body 710 in a state in which a part of the screw thread 221 is cut off, filling the gap between the incision grooves 223 while the bone constituting the spine 700 is generated. The fastening part 220 may be prevented from being reversed by an external shock.

The cutting groove 223 is at least diagonally parallel to the virtual Y axis (Y) direction parallel to the vertical length direction of the fastening part 220 or in a direction opposite to the direction in which the thread 221 of the fastening part 220 is formed. One or more may be formed.

In more detail, the cutting groove 223 is a direction in which the thread 221 of the fastening portion 220 is formed in a virtual oblique direction inclined with respect to the virtual Y axis as shown in FIG. 8 (a) or FIG. 8 (b). It can be formed continuously or discontinuously along.

In addition, the cutting groove 223 is fastened to a virtual straight direction formed parallel to the virtual Y-axis direction parallel to the vertical length of the fastening part 220 as shown in FIG. 8 (c) or FIG. 8 (d). The threads 221 of 220 may be formed continuously or discontinuously along the formed direction.

Here, the cutting groove 223 is formed discontinuously, as shown in FIG. 8 (b) or 8 (d), the cutting groove (221) of one of the threads 221 of the screw thread 221 of the fastening part 220. 223 is formed, and one thread 221 and the adjacent thread 221 is a pattern in which the incision groove 223 is missing is repeated.

At this time, the discontinuous formation pattern of the cutout groove 223 is not limited to the embodiment shown in FIG. 8, for example, a screw thread adjacent to a plurality of threads 221 having two or more cutout grooves 223. Applications and modifications, such as applying a pattern formed at 221, are of course possible.

On the other hand, the fourth unit 400 is for limiting the rotation of the second unit 200 as described above and for maintaining a solid procedure, the structure consisting of a combination of the pressing ring 410 and the elastic ring support piece 420 I can see that.

The pressing ring 410 is seated in the inner space 102 by pressing the upper outer surface of the ball joint head 210 disposed on the upper portion of the second unit 200, and in contact with the outer peripheral surface of the rod 500 at the top, The first unit 100 is pressed by the fastening force of the third unit 300 coupled to.

In addition, the pressing ring 410 may further include a C ring (C).

C ring (C) is to cut a portion of the ring-shaped member to have a contracting force, and is fitted to the outside of the pressing ring 410 is fixed to the outer side of the pressing ring 410 by the contracting force more close to the head 210 Thereby minimizing the space between the head 210 and the pressure ring 410.

The elastic ring support piece 420 is fixed to the first ring stepped step 130 formed stepwise along the lower inner circumferential surface of the inner space 102 and supports the lower outer surface of the ball joint head 210 while allowing elastic deformation. will be.

The pressing ring 410 may be understood to be more specifically a structure including a contact ring portion 412, an inclined surface portion 414, and a second locking pattern 416.

That is, the contact ring portion 412 is a ring-shaped member that is vertically penetrated with an outer circumferential surface contacted and fixed to the inner circumferential surface of the first unit 100 forming the inner space 102.

The inclined surface portion 414 extends downward along the lower edge of the contact ring portion 412, and has a pressing groove 413 having a shape corresponding to an upper outer surface of the ball joint head 210 inside the bottom surface.

Referring to the structure of FIG. 5, the second locking pattern 416 is pressed in response to the first locking pattern 211 in which ring-shaped protrusions are concentrically repeated from the center of the upper end of the ball joint head 210 toward the lower end. A plurality of grooves are formed along the formation direction of the grooves 413.

Looking at the second locking pattern 416 in more detail with reference to Figure 5, it may be said to have a structure protruding in a stepped shape round the inner surface of the inclined surface portion 414 constituting the pressing ring 410.

In addition, the elastic ring support piece 420 may be understood to have a structure including the support body 421, the third ring step 423 and the deformation cutout 424.

The supporting body 421 is a ring-shaped member having a second ring step 422 supporting the lower outer surface of the ball joint head 210 along the lower side of the inner circumferential surface.

The third ring step 423 is formed to be stepped along the outer circumferential surface of the support body 421 to be locked to the first ring step 130.

The deformed notch 424 is formed by cutting a portion of the outer circumferential surface of the support body 421 along the vertical length direction of the support body 421.

Therefore, the diameter of the support body 421 may be varied to correspond to the width of the deformation notch 424, and by reducing the diameter of the support body 421 smoothly inside the first unit 100, that is, the head 110. It may be inserted, and once the support body 421 is accommodated in the head 110 may be tightly fixed to the lower portion of the head 110 by the elastic restoring force.

As described above, it can be seen that the present invention has a basic technical idea to provide a screw assembly for a spinal implant which allows the angle and position adjustment to be installed and installed in accordance with various body types of patients to be free and robust. have.

In addition, many modifications and applications may be made to those skilled in the art within the scope of the basic technical idea of the present invention.

Claims (16)

A first unit which is cut out while facing each other from an upper edge and has an insertion groove having an lower end in an arc shape, and forms an inner space and penetrates vertically; A rod on which the outer circumferential surface of one side is seated in the insertion groove, and the outer circumferential surface of the other side is seated on the insertion groove of the first unit adjacent to the first unit; An upper part of which is rotatably received at a lower side of the inner space, and a lower part of which is screwed and fixed to the vertebral body constituting the vertebra; A third unit screwed to an upper side of the inner space to fix the rod; And And a fourth unit disposed between the inner space and an upper portion of the second unit to limit the rotation of the second unit. The method according to claim 1, The second unit, A ball joint head accommodated in the inner space and fixed to the fourth unit at upper and lower portions thereof; A fastening part having a thread extending from a lower side of the ball joint head and inserted into and fixed to the vertebral body; The screw assembly for the spinal implant is formed along the longitudinal direction of the fastening portion, and including an incision groove for preventing the screw thread of the fastening portion to reverse rotation. The method according to claim 1, The screw assembly for spinal implants, A first screw portion having a round screw shape formed on an outer circumferential surface of the third unit, A second screw portion formed along an upper inner circumferential surface of the inner space of the first unit and having a round screw shape engaged with the first screw portion; The screw thread having a round screw shape constituting the first and second threads is inclined upward with respect to a first imaginary line passing through the center portion in the vertical length direction of the first unit, respectively. The method according to claim 1 The screw assembly for spinal implants, A first screw portion having a round screw shape formed on an outer circumferential surface of the third unit, A second screw portion formed along an upper inner circumferential surface of the inner space of the first unit and having a round screw shape engaged with the first screw portion; The screw thread having a round screw shape constituting the first and second threads is orthogonal to the first virtual line passing through the center portion in the vertical length direction of the first unit, respectively. . The method according to claim 3, The first inclination angle formed by the screw thread on the upper side of the second virtual line and the second virtual line with respect to the second virtual line passing through the center of the screw bone of the first threaded portion or the second threaded portion and orthogonal to the first virtual line, The screw assembly for the spinal implant, characterized in that the same as or different from the second inclination angle formed by the screw thread below the second virtual line and the second virtual line. The method according to claim 3, The angle of inclination between the screw thread on the upper side of the second virtual line and the second virtual line is 3 ° to the second virtual line passing through the center of the screw bone of the first screw portion or the second screw portion and orthogonal to the first virtual line. 9 °, and the inclination angle formed by the screw thread below the second virtual line and the second virtual line is 3 ° ~ 9 °, the screw assembly for spinal implants. The method according to claim 2, The ball joint head, The top is a round or elliptical cross section cut flat, And a first locking pattern in which ring-shaped protrusions and grooves are concentric from the center of the upper end of the ball joint head toward the lower end side. The first engaging pattern is coupled to the fourth unit screw assembly for spinal implants, characterized in that to limit the rotation of the ball joint head. The method according to claim 1, The fourth unit, The upper outer surface of the ball joint head disposed on the upper portion of the second unit is pressed into the inner space, the upper contact with the outer circumferential surface of the rod, is pressed by the fastening force of the third unit combined with the first unit With pressure ring, A screw for spinal implant, characterized in that it comprises an elastic ring support piece for holding and supporting the lower outer surface of the ball joint head while being fixed to the first ring stepped stepped along the lower inner circumferential surface of the inner space and allowing elastic deformation. assembly. The method according to claim 8, The pressure ring, A ring-shaped contact ring having a top and bottom through ring having an outer circumferential surface contacted and fixed to an inner circumferential surface of the first unit forming the inner space; An inclined surface portion extending downward along a lower edge of the contact ring portion and having a pressing groove having a shape corresponding to an upper outer surface of the ball joint head inside a bottom surface; A second locking pattern formed in a plurality of directions along the forming direction of the pressing groove in response to the first locking pattern in which the ring-shaped protrusions and the grooves are concentric from the center of the upper end of the ball joint head toward the lower end; And a C ring mounted on an outer surface between the contact ring portion and the inclined surface portion, the C ring having a contracting force by cutting off a portion of a ring-shaped member. The method according to claim 8, The elastic ring support piece, A ring-shaped support body having a second ring stepped to support the lower outer surface of the ball joint head along an inner circumferential surface thereof; A third ring stepped to be stepped along the outer circumferential surface of the support main body and fixed to the first ring stepped; It includes a deformed notch formed by cutting a portion of the outer peripheral surface of the support body along the vertical length of the support body, The diameter of the support body is a screw assembly for a spinal implant, characterized in that the variable corresponding to the width of the deformed cut. The method according to claim 2, With respect to the center point penetrating the center of the virtual circle extending upward from the lower outer surface of the ball joint head, The first radius extending from the center point to the end of the first locking pattern consisting of a plurality of protrusions formed in a circumferential shape on the upper outer surface of the ball joint head, Less than a second radius extending from the center point to the lower outer surface of the ball joint head, And a third radius extending from the center point to a concave portion between one of the plurality of protrusions and a neighboring protrusion. The method according to claim 2, The incision groove, Screw assembly for spinal implant, characterized in that provided with at least one or a plurality of diagonally parallel to the virtual Y-axis direction parallel to the vertical longitudinal direction of the fastening portion or inclined with respect to the virtual Y-axis. The method according to claim 2, The incision groove, It is formed continuously or discontinuously along the direction in which the thread of the fastening part is formed in a virtual straight direction formed parallel to the virtual Y axis direction parallel to the vertical length direction of the fastening part, or inclined with respect to the virtual Y axis. Screw assembly for a spinal implant, characterized in that formed continuously or discontinuously along the direction in which the thread of the fastening portion is formed in an imaginary oblique direction. The method according to claim 13, The discontinuous groove is formed discontinuously, The incision groove is formed in one of the threads of the fastening portion, the screw assembly for a spinal implant, characterized in that the pattern of the lack of the incision is repeated in the one thread and the neighboring thread. The method according to claim 1, The screw assembly for spinal implants, Screw assembly for spinal implant, characterized in that it further extends from the upper side of the third unit, and provided in pairs to face each other. The method according to claim 15, The support is, A support body disposed above the third unit and opposed to each other, The support body and the upper surface of the third unit are interconnected, and the screw assembly for a spinal implant, characterized in that it comprises a connecting piece removable from the upper surface of the third unit when the procedure is completed.

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