KR20180078379A - Pedicle screw assembly with multiple rods - Google Patents

Abstract

The present invention relates to a screw assembly for vertebra having multiple rods, which comprises: a screw body which is fixed to the vertebral bone; a head portion on which the screw body is securely mounted and fixed; and a pair of internal communication slots formed from the upper surface of the head portion, wherein a rod portion, which is formed with a plurality of thin wires united with one another, mounted and fixed on the pair of internal communication slots. The screw assembly has a comparatively simple structure, thereby aiding in reducing production costs and allowing firm mounting and fixing state of the rod, and structural strength thereof to be maintained. According to the present invention, the rod portion can move in the same direction as facet joints move by flexibility of each of the thin rods constituting the rod portion, thereby imposing no burden on spinal joints and giving a user a comfortable sensation.

Description

[0001] PEDICLE SCREW ASSEMBLY WITH MULTIPLE RODS [0002]

The present invention relates to a spinal screw assembly, and more particularly, to a spinal screw assembly having multiple rods capable of reducing a production cost with a relatively simple configuration and capable of maintaining a stable mounting state and structural strength of the rod Spinal screw assembly.

The disc is a tissue located between the vertebrae and the neighboring vertebrae. The outside of the above-mentioned disc is protected by ligaments, and the inside of the disc contains a nucleus.

Most of the nuclei are composed of water. As the age decreases, the water content gradually decreases and the discs lose their buffering function.

As a result, excessive pressure on the fiber causes pain, and when it is further advanced, the fiber is severely stretched or ruptured, causing pain in the pelvis and legs by pressing the nerve root located on the back.

There are various side effects such as the narrowing of the spinal column gradually or the vertebral bone falling and the spinal deformity.

For this reason, when performing surgery to remove the severely distorted or incomplete disc, measures should be taken to maintain the spinal gap and prevent the spine from deforming or shaking.

To do this, the practitioner removes the damaged part of the vertebrae so that the injured part of the vertebrae is not pressed or pressed, and the part where the disk is removed by filling the bone part with a hollow metallic or plastic artificial augment (cage) .

Thereafter, a method of inserting a pedicle screw into the vertebrae of the upper and lower parts of the injured disc, connecting the rod to the pedicle screw to secure the distance between the vertebrae, and so on, is performed.

(Hereinafter referred to as " Dynamic Rod "(hereinafter referred to as " Prior Art 2 ") of Patent Application No. 10-2006-0118258 and Patent Application No. 10-2008-0028593 And the like.

Previously, a leaf spring was formed in the middle of a bar-shaped rod to allow a certain degree of elastic deformation of the pedicle screw fixedly connected to the vertebra bone and the vertebra bone fixed to the vertebra bone adjacent thereto, And a separate rod rotatable by a fixing pin is provided at an intermediate portion of the rod as a shape.

The prior art is designed to allow the rod to support the displacement when the gap and position between the vertebrae and the neighboring vertebrae are deformed by various actions in the daily life of the subject who has completed the procedure,

However, all of the prior arts require a rod-shaped rod in the form of a solid rod and a separate member such as a plate spring formed on a part of the rod or a rotatable member by a fixing pin, There is a problem that the raw material is consumed more than necessary in order to manufacture a solid rod-like rod, a leaf spring, and a separate rotatable member.

Patent Application No. 10-2006-0118258 Patent Application No. 10-2008-0028593

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a multi-rod structure capable of reducing production cost with a relatively simple structure, To provide a spinal screw assembly.

Further, by arranging a plurality of wires each having a small diameter so as to form a rod portion, it is possible to naturally bend in response to the movement of the facet joint due to the softness possessed by each fine rod itself And to provide a spinal screw assembly having multiple rods.

According to an aspect of the present invention, there is provided a spinal column comprising: a screw body including a body fixed to a vertebra; A head portion having an upper surface opened and a receiving space through which the body is inserted and fixed so that an upper end of the body is seated and fixed; A rod portion including a plurality of wires having a predetermined length, the rod portions being arranged in contact with each other in a longitudinal direction of the plurality of wires; And a pair of inner communication slots which are mutually opposed to each other so as to be gradually narrowed from the side edges of the upper surface of the head portion to the lower side orthogonally to the inserting direction of the body, Wherein the spinal screw assembly includes a plurality of rods.

Here, the pair of inner communication slots may include a straight cut portion formed by cutting a predetermined width toward the lower side from both side edges of the upper surface of the head portion, and a narrow cut portion formed to be gradually narrowed downward from the lower end of the straight cut portion .

In this case, the pair of inner communication slots may include a narrow curved incision portion that narrows and forms a concave curved surface from the side edges of the upper surface of the head portion downward.

The lowermost end of the pair of inner communication slots is a concave parabola having a vertex on the y-axis of the x-axis and the y-axis, which are coordinate axes in the rectangular coordinate plane, and is parallel to the y- A curved shape having a quadrant cut by a first straight line passing through a point on the axis and a sharp lower end formed by symmetrically forming an arc on the quadrant of the third quadrant with respect to the first straight line, A curved shape having a quadrant cut by a second straight line passing through a point on the x-axis and a sharp lower end formed by symmetrically forming an arc on the quadrant of the fourth quadrant with respect to the second straight line.

The lowermost end of the pair of inner communication slots is formed in an arc shape, and the outer circumferential surface of the single wire among the plurality of wires closely corresponds to the lowermost end of the arcuate shape.

Each of the plurality of wires has a circular or elliptical cross section.

The rod portion is fixed to a bottom end portion of the pair of inner communication slots of the plurality of wires in a state in which a part or whole of the outer circumferential surface is in close contact with the top surface and has a flat upper surface and a circular curved surface And a circular or elliptical cross section having at least two contact points on the flat upper surface of the base wire and being seated so as to be laminated in multiple stages from the upper surface of the base wire, And a plurality of stacked wires each having a plurality of stacked wires.

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

The present invention is characterized in that a screw main body fixed to a vertebra bone is formed with a pair of inner communication slots from an upper surface of a head portion on which a screw main body is seated and fixed, Adoption of a structure in which an additional seat is fixed enables a stable mounting and fixing state of the rod and a structural strength to be maintained even with a simple structure as compared with the prior art.

Particularly, the present invention minimizes unnecessary waste of raw materials compared to the prior art by applying a rod unit composed of a plurality of wires, thereby reducing the production cost and also reducing the time and cost required for designing and manufacturing Will be.

Here, the present invention is characterized in that the pair of inner communication slots are formed into a shape including a straight cut portion formed by cutting a predetermined width from both side edges of the upper surface of the head portion and a narrow cut portion formed so as to be gradually narrowed toward the lower side, It is possible to provide a structure that is firmly seated and fixed in a stacked state.

At this time, according to the present invention, a pair of inner communication slots are formed in the form of narrow curved cut-out portions by forming a curved concave curve from the side edges of the upper surface of the head to the lower side to form a narrow curved cutout portion, It is possible to provide a structure in which it is seated and fixed.

In addition, in the present invention, when forming the pair of inner communication slots, the inner communication slots are formed in a curved shape having a sharp bottom end in the shape of the lowermost end, so that the wire arranged at the lowermost end of the inner communication slot is securely and firmly A plurality of wires can be stacked and secured from the upper side after being fixedly secured.

According to the present invention, a lowermost end of a pair of inner communication slots is formed in an arc shape, and an outer circumferential surface of one of a plurality of wires is closely arranged on an arc-shaped lowermost end to prevent swinging, Will be maintained.

In addition, the cross-section of each of the plurality of wires may form a circular or elliptical cross-section so as to be seated and fixed corresponding to the various communication inner slots described above, A base wire in the form of a column or semi-elliptic column, and a laminated wire having a circular or elliptical cross-section, thereby preventing swinging and ensuring a stable state of operation.

Further, due to the softness of each thin rod constituting the rod portion, the facet joint can be moved in the same direction according to the moving direction, so that the movement of the spinal joints can be made comfortable and comfortable.

1 is a perspective view illustrating the overall structure of a spinal screw assembly having multiple rods according to an embodiment of the present invention;
FIGS. 2 to 4 are sectional view schematically showing an internal structure of a spinal screw assembly having multiple rods according to various embodiments of the present invention, as viewed from point A of FIG.
FIG. 5 is a view of the spinal screw assembly with multiple rods according to an embodiment of the present invention, viewed from the viewpoint of FIG. 1; FIG. 5 schematically shows the shape tolerance state of the rod portion according to the behavior of the vertebrae in an exaggerated manner; Partial side view

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments described below, but may be embodied in various other forms.

The present embodiments are provided so that the disclosure of the present invention is thoroughly disclosed and that those skilled in the art will fully understand the scope of the present invention.

And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.

In addition, throughout the specification, like reference numerals refer to like elements, and the terms (mentioned) used herein are intended to illustrate the embodiments and not to limit the invention.

In this specification, the singular forms include plural forms unless the context clearly dictates otherwise, and the constituents and acts referred to as " comprising (or having) " do not exclude the presence or addition of one or more other constituents and actions .

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

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

1 is a perspective view showing the overall structure of a spinal screw assembly having multiple rods according to an embodiment of the present invention.

2 to 4 are schematic cross-sectional views illustrating the internal structure of a spinal screw assembly having multiple rods according to various embodiments of the present invention, as viewed from point A of FIG.

FIG. 5 is a perspective view of the spinal screw assembly of FIG. 1 taken along line B of FIG. 1; FIG. 5 is a perspective view of the spinal screw assembly with multiple rods according to an embodiment of the present invention. Is a partial side conceptual view schematically showing the shape deformation permitting state of the resin film 30 in an exaggerated manner.

The present invention can be understood as a structure including the screw main body 10, the head portion 20, the rod portion 30, and the pair of inner communication slots 50 and 50 as shown in FIG.

That is, the present invention is characterized in that a pair of inner communication slots 50, 50 are formed from the upper surface of the head portion 20 to which the screw body 10 fixed to the vertebrae 40 is seated and fixed, It is possible to apply the embodiment in which the rod portion 30 formed by contacting a plurality of thin wires 31 in a cohesive manner is fixed to the slots 50 and 50. By arranging the plurality of wires 31 in contact with each other, it is possible to construct multiple rods rather than a single rod.

The screw main body 10 includes a body 11 fixed to the vertebrae 40 and is provided for maintaining the fastening force with respect to the vertebrae 40. [

The head portion 20 is provided with a receiving space 21 whose upper surface is opened and the body 11 is inserted and inserted so that the upper end portion of the body 11 is seated and fixed to provide a seating space for the screw body 10 A seat fixing space of a rod unit 30 to be described later which connects and fixes each of the head units 20 connected and fixed to each of the screw bodies 10 fixed to the vertebrae bones 40 and the adjacent vertebrae bones 40 .

The rod 30 includes a plurality of wires 31 having a predetermined length and is arranged in contact with each other along the longitudinal direction of each of the plurality of wires 31. The rod 30 includes a spinal bone 40, And a structure for fundamentally preventing the cellular tissues such as nerves between the vertebrae 40 and the neighboring vertebrae 40 from being pressed to cause pain by performing the function of the bone 40 to maintain the intervals .

The pair of inner communication slots 50 and 50 are cut so that they are gradually narrowed from the side edges of the upper surface of the head portion 20 to the lower side in a direction orthogonal to the inserting direction of the body 11, 31 are seated and fixed through a pair of the inner communication slots 50, 50.

It is needless to say that the present invention can be applied to the embodiment having the above-described configuration, and the following various embodiments can be applied.

1, the present invention further includes a fixing nut 60 formed along an outer circumferential surface of a male thread 61 coupled to a female thread (not shown) formed along the inner circumferential surface of the head 20 as shown in FIG. 1 It is possible.

Therefore, the lower surface of the fixing nut 60 is in contact with the plurality of wires 31 that are seated and fixed to the pair of inner communication slots 50, 50, thereby pressing and fixing the plurality of wires 31.

2, the pair of inner communication slots 50 and 50 includes a straight cutout portion 51 formed by cutting a width of the head portion 20 downward from both side edges of the upper surface of the head portion 20, And a narrow cut-out portion 52 which is formed so as to be gradually narrowed from the lower end of the first cut-out portion 51 toward the downward direction.

Here, one wire 31 of the plurality of wires 31 is seated and fixed to the narrow cutout 52 described above, and at least two adjacent single wires (not shown) are formed on the outer circumferential surface of one wire 31 31 and the plurality of wires 31 are seated in the pair of inner communication slots 50, 50 while forming a contact with the inner communication slots 31,

That is, the two wires 31 are seated on the upper side of the wire 31 placed at the lowermost end of the pair of the inner communication slots 50, 50, so that the straight cutout portion 52 connected to the narrow cut- The plurality of wires 31 can be reliably held in a fixed state over a space through the lower end of the wire 51.

On the other hand, the pair of inner communication slots 50, 50, as shown in Fig. 3, forms a narrow curved incision from the side edges of the upper surface of the head portion 20 downward, The present invention can be applied to an embodiment including a structure.

At least n (n is a natural number of 1 or more) wires 31 of a plurality of wires 31 are seated and fixed at the lowermost end of the narrow curve cutout part 53, and n + One wire 31 is seated and fixed and a pattern in which n + 2 wires 31 are seated and fixed on the (n + 1) wires 31 is repeated, It will be possible to hold the seat in a reliable state even by the load applied in turn to the seat.

As shown in FIGS. 2 and 3, the lowermost ends of the pair of inner communication slots 50 and 50 are formed in a curved shape with a sharp bottom end, and the shape thereof will be described in more detail as follows.

First, we define a downwardly concave parabola with vertices on the x and y axes, the coordinate axes in the Cartesian coordinate plane.

Here, the lowermost ends of the pair of inner communication slots 50, 50 are divided into two quadrants cut by a first straight line passing through a point on the x-axis parallel to the y-axis and x <0, And may have a curved shape with a sharp lower end formed symmetrically with respect to a straight line.

At this time, the lowermost ends of the pair of inner communication slots 50, 50 are arranged in the order of a first quadrant and a fourth quadrant arc cut by a second straight line passing through a point on the x-axis parallel to the y- Or may have a curved shape with a sharp lower end formed symmetrically with respect to two straight lines.

One of the wires 31 that is seated and fixed to the sharp bottom end of the wire 31 is seated and fixed in contact with two points of the outer circumferential surface of the one wire 31 and the sharp bottom end, It is possible to maintain a stable seat fixing state without departing from the head portion 20 as a reference.

On the other hand, the lowermost ends of the pair of inner communication slots 50, 50 may be formed in an arc shape, though not specifically shown, and the outer peripheral surface of the single wire 31 among the plurality of wires 31 at the lowermost end of the circular arc shape A closely corresponding structure may be provided.

Here, the cross section of each of the plurality of wires 31 may be circular or elliptical.

4, in order to provide a reliably preventing structure of the rod portion 30, the rod portion 30 may be formed in accordance with the structure of the base wire 32 and the laminated wire 33 It goes without saying that the embodiment may be applied.

That is, the base wire 32 is seated and fixed to a lowermost end portion of a pair of inner communication slots 50, 50 of the plurality of wires in close contact with a part or all of the outer circumferential surface thereof. The base wire 32 has a flat upper surface, And is a semicircular column or semicircular columnar member that forms an arc-shaped curved surface.

The laminated wire 33 has at least two contact points on a flat upper surface of the base wire 32 and has a plurality of members having circular or elliptical cross sections which are stackably stacked from the upper surface of the base wire 32 to be.

Hereinafter, the operation and effect of the spinal screw assembly having multiple rods according to various embodiments of the present invention will be described as follows.

First, the present invention is characterized in that a pair of inner communication slots 50, 50 are formed from the upper surface of a head portion 20 to which a screw body 10 fixed to the vertebrae 40 is seated and fixed, By adopting a structure in which the rod portions 30 formed by contacting a plurality of thin wires 31 in a cohesive manner are seated and fixed to the slots 50 and 50, even in a simple construction compared to the prior art, State and structural strength can be maintained.

In particular, the present invention minimizes unnecessary raw material waste compared to the prior art by applying the rod portion 30 composed of a plurality of wires 31, thereby reducing the production cost, Time and cost will also be reduced.

The present invention is characterized in that a pair of inner communication slots 50 and 50 are formed by a straight cutout portion 51 formed by cutting a predetermined width from both side edges of the upper surface of the head portion 20 and a narrow cutout portion (52), it is possible to provide a structure in which the plurality of wires (31) are firmly seated and fixed in a multi-layer stacked state.

At this time, according to the present invention, a pair of inner communication slots (50, 50) are formed in the form of a narrow curved cutout (53) by forming a concave curved line from the side edges of the upper surface of the head to the lower side, It is possible to provide a structure in which the wires 31 are firmly seated and fixed in a multi-layer stacked state.

The inner communication slots 50 and 50 are formed in a curved shape having a sharp bottom end in the shape of the lowermost end of the inner communication slots 50 and 50, The plurality of wires 31 can be stacked in a multi-layered manner from the upper side of the wire 31 in a state in which the wire 31 disposed at the lowermost end of the wire 31 is firmly and firmly fixed.

In the present invention, the lowermost ends of the pair of inner communication slots (50, 50) are formed in an arc shape, and the outer peripheral surface of one of the plurality of wires (31) It will be possible to prevent the swinging and to maintain the stable state of the procedure securely.

In addition, the cross section of each of the plurality of wires 31 can be formed to have a circular or elliptical cross-section so as to be seated and fixed corresponding to the various formed inner communication slots 50, 50 described above, By providing a base wire 32 in the form of a semicircular column or semi-elliptic column and a laminated wire 33 in a circular or elliptic cross section in correspondence with the lowermost end of the communication slots 50, 50, Thereby maintaining the state of the operation.

As described above, it is an object of the present invention to provide a spinal screw assembly having multiple rods that can reduce the production cost with a relatively simple structure, and also make it possible to maintain a stable mounting state and structural strength of the rod. It can be seen that it is technological thought.

Further, according to the present invention, since each fine rod constituting the rod portion is flexible, it can flexibly move in accordance with the moving direction of the facet joint, so that the movement of the spinal joint can be made comfortable, The present invention provides a spinal screw assembly having a plurality of rods provided with a plurality of spinal screw assemblies.

It will be apparent to those skilled in the art that many other modifications and applications are possible within the scope of the basic technical idea of the present invention.

10 ... screw body
11 ... body
20 ... head portion
21 ... accommodation space
30 ... rod
31 ... wire
32 ... base wire
33 ... laminated wire
40 ... spine bone
50, 50 ... Internal communication slot
51 ... straight incision
52 ... narrow incision
53 ... narrow curve incision
60 ... Fixed nut
61 ... male threads

Claims (7)

A screw body including a body fixed to a vertebra bone;
A head portion having an upper surface opened and a receiving space through which the body is inserted and fixed so that an upper end of the body is seated and fixed;
A rod portion including a plurality of wires having a predetermined length, the rod portions being arranged in contact with each other in a longitudinal direction of the plurality of wires; And
And a pair of inner communication slots which are cut so as to become gradually narrower from both side edges of the upper surface of the head portion to the lower side orthogonally to the inserting direction of the body,
Wherein the plurality of wires are seated and fixed through the pair of inner communication slots.
The method according to claim 1,
The pair of inner communication slots
A straight cut portion formed at a predetermined width from the both side edges of the upper surface of the head portion toward the lower side,
And a narrow cutout portion that is formed so as to be gradually narrowed downward from a lower end portion of the straight cutout portion.
The method according to claim 1,
The pair of inner communication slots
And a narrow curved incision which narrows and forms a concave curved slope downward from both side edges of the upper surface of the head part.
The method according to any one of claims 1 to 3,
The lowermost end of the pair of inner communication slots
In a downwardly concave parabola having vertices on the x-axis, which is the coordinate axis in the Cartesian coordinate plane, and the y-axis,
A quadrangular plane cut by a first straight line passing through a point on the x-axis parallel to the y-axis and x < 0, and a curved shape having a sharp lower end formed by symmetrically forming an arc on the quadrant of third quadrature with respect to the first straight line Lt; / RTI &
A quadrangular plane cut by a second straight line passing through a point on the x-axis parallel to the y-axis and having x> 0, and a curved shape having a sharp lower end formed by symmetrically forming an arc on the quadrant of quadrature with respect to the second straight line The spinal screw assembly comprising a plurality of rods.
The method according to any one of claims 1 to 3,
The lowermost end of the pair of inner communication slots is formed in an arc shape,
And the outer circumferential surface of the single wire among the plurality of wires closely corresponds to the lowermost end of the arcuate shape.
The method according to claim 1,
Wherein the cross-section of each of the plurality of wires is circular or elliptical.
The method according to claim 1,
The load unit includes:
A semicircular post or a semicircular post which forms an arcuate curved surface from both side edges of the upper surface and a lower surface of the upper surface, A semi-elliptic columnar base wire,
And a plurality of laminated wires having at least two or more contact points on the flat upper surface of the base wire and having a circular or elliptical cross section that is seated so as to be laminated in multiple stages from the upper surface of the base wire. A spinal screw assembly comprising:

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