KR20230150126A - Pedicle screw - Google Patents

Abstract

The present invention relates to a screw; a screw head coupled to the screw and including a first movement control area provided flatly to control movement of the screw; a housing coupled to the screw head and including a second movement control area provided to contact the first movement control area; and an inner cap accommodated in the housing. It relates to a pedicle screw.

Description

Pedicle screw{PEDICLE SCREW}

The present invention relates to pedicle screws or pedicle fixation screws.

The spine may have structural problems, such as problems with stable alignment or narrowing of the gap between vertebral bodies, for various reasons such as congenital, degenerative, or accidents. Representative spinal diseases include spinal deformity, spinal fracture, herniated disc, spinal stenosis, and posterior joint hypertrophy.

In the treatment of diseases related to the spine, indirect treatment methods through physical therapy and direct treatment methods of correcting and fixing the spine by installing a separate fixation device on the damaged vertebrae are usually performed. Among these, spinal fixation devices such as pedicle screws are commonly used as a direct treatment method to physically correct the damaged spine.

Pedicle screws used for spinal diseases such as spinal deformity can be divided into uniplanar pedicle screws, monoaxial pedicle screws, and polyaxial pedicle screws. there is.

To explain in more detail, multi-axis pedicle screws can move with the greatest flexibility. That is, the multi-axis pedicle screw can rotate freely in any direction and in any plane about the central axis, and accordingly, various long rods can be used. On the other hand, a single-plane pedicle screw can only rotate back and forth in one plane about its central axis, and its movement in all other planes is limited.

The multi-axis pedicle screw of US Patent Publication No. 2004/0158247A1 proposes a method for controlling the movement of the housing in a free state. However, depending on the condition of the spinal disease, there is a need for a single-plane pedicle screw to allow the screw to move only in one plane, rather than moving freely in all planes.

US Patent Publication No. 2004/0158247A1

The present invention is intended to improve the problems of the prior art described above, and its purpose is to provide a pedicle screw that has a simple internal structure and can control movement in a direction desired by the user.

Specifically, the purpose of the present invention is to provide a single-plane pedicle screw to allow the screw to move in only one plane.

However, the problem to be solved by the present application is not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

The present invention relates to a screw; a screw head coupled to the screw and including a first movement control area provided flatly to control movement of the screw; a housing coupled to the screw head and including a second movement control area provided to contact the first movement control area; and an inner cap accommodated in the housing. It relates to a pedicle screw.

The present invention may be characterized in that the second movement control area is located in a first band among at least two bands on the inner surface of the housing.

In the present invention, the screw head has a sphere shape penetrating in the upper and lower directions, and includes two first movement control areas located at symmetrical positions on the outer surface of the sphere shape, and the inside of the housing. The first band provided on the surface may be characterized in that it has two second motion control areas at positions that can contact the first movement control areas.

The present invention may be characterized in that the first band is implemented in a circular form with two straight sections, and each of the two straight sections is the second motion control area.

In the present invention, the screw head has a sphere shape penetrating in the upper and lower directions, and further includes a slot and a groove that provide elastic force when the screw is coupled with the screw head. It may be a feature.

The present invention may be characterized in that the pedicle screw makes surface contact between the first movement control area and the second movement control area.

The present invention may be characterized in that the pedicle screw can move only on one plane (uniplanar).

The present invention may be characterized in that the screw and the housing can rotate independently.

The present invention may be characterized in that the housing is rotatable while the screw is fixed.

The present invention includes: a rod; And it may further include a set screw, wherein the pedicle screw is restricted from moving in a direction perpendicular to the load axis due to contact between the first movement control area and the second movement control area.

According to the pedicle screw according to the present invention, the user's usability can be increased because the user can control movement in the desired direction while having a simple internal structure.

In addition, according to the pedicle screw according to the present invention, the stability of the pedicle screw can be improved because it has a simple internal structure and can control movement to a plane other than the plane desired by the user.

Figure 1 is an exploded perspective view of a pedicle screw according to an embodiment of the present invention.
Figure 2a is a perspective view of a screw according to an embodiment of the present invention.
Figure 2b is a front view of a screw according to an embodiment of the present invention.
Figure 2c is a cross-sectional view of a portion of a screw according to an embodiment of the present invention.
Figure 3a is a first perspective view of a screw head according to an embodiment of the present invention.
Figure 3b is a second perspective view of a screw head according to an embodiment of the present invention.
Figure 3c is a cross-sectional view of a screw head according to an embodiment of the present invention.
Figure 4a is a front view of a coupled state of a screw and a screw head according to an embodiment of the present invention.
Figure 4b is a right side view of a coupled state of a screw and a screw head according to an embodiment of the present invention.
Figure 4c is a left side view of a combined state of a screw and a screw head according to an embodiment of the present invention.
Figure 4d is a partial cross-sectional view of a coupled state of a screw and a screw head according to an embodiment of the present invention.
Figure 5a is a perspective view of a housing according to an embodiment of the present invention.
Figure 5b is a perspective view of the front cross-section of the housing according to an embodiment of the present invention.
Figure 6 is a plan cross-sectional view of the first band of the housing according to an embodiment of the present invention.
Figure 7a is a front view of a housing according to an embodiment of the present invention.
Figure 7b is a left side view of the housing according to an embodiment of the present invention.
Figure 7c is a top view of a housing according to an embodiment of the present invention.
Figure 7d is a bottom view of the housing according to one embodiment of the present invention.
Figure 8a is a perspective view of an inner cap according to an embodiment of the present invention.
Figure 8b is a cross-sectional perspective view of an inner cap according to an embodiment of the present invention.
Figure 8c is a front cross-sectional view of an inner cap according to an embodiment of the present invention.
Figure 9 is a front cross-sectional view of a portion of a pedicle screw according to another embodiment of the present invention.
Figure 10a is a perspective view of the movement of the pedicle screw according to an embodiment of the present invention.
Figure 10b is a front view of the movement of the pedicle screw according to an embodiment of the present invention.
Figure 10c is a bottom view of the movement of the pedicle screw according to an embodiment of the present invention.
Figure 11 is a side cross-sectional view of a portion of a pedicle screw according to another embodiment of the present invention.
Figure 12a is a perspective view of a set screw according to another embodiment of the present invention.
Figure 12b is a top view of a set screw according to another embodiment of the present invention.
Figure 12c is a front cross-sectional view of a set screw according to another embodiment of the present invention.
Figure 13a is a perspective view of a pedicle screw coupled state according to another embodiment of the present invention.
Figure 13b is a front cross-sectional view of a portion of a pedicle screw according to another embodiment of the present invention.
Figure 13c is a side cross-sectional view of a portion of the pedicle screw according to an embodiment of the present invention.

The present invention relates to pedicle screws.

More specifically, screw; a screw head coupled to the screw and including a first movement control area provided flatly to control movement of the screw; a housing coupled to the screw head and including a second movement control area provided to contact the first movement control area; and an inner cap accommodated in the housing. It relates to a pedicle screw.

With reference to the drawings, embodiments of the present invention will be described in more detail. However, the following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention along with the contents of the above-described invention, so the present invention is described in such drawings. It should not be interpreted as limited to the specifics. In addition, in order to clearly explain the present application in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

The terms used in this specification are for describing embodiments and are not intended to limit the invention. As used herein, singular forms also include plural forms unless specifically stated otherwise in the context.

As used in the specification, comprises and/or comprising means the presence or addition of one or more other components, steps, operations and/or elements other than the mentioned components, steps, operations and/or elements. It is used in a non-excluding sense. Like reference numerals refer to like elements throughout the specification.

Spatially relative terms such as “below”, “beneath”, “lower”, “above”, “upper”, etc. are used as a single term as shown in the drawing. It can be used to easily describe the correlation between members or components and other members or components. Spatially relative terms should be understood as terms that include different directions of the member during use or operation in addition to the direction shown in the drawings. For example, if a member shown in the drawings is turned over, a member described as “below” or “beneath” another member may be placed “above” the other member. Accordingly, the illustrative term “down” may include both downward and upward directions. Members can also be oriented in other directions, so spatially relative terms can be interpreted according to orientation.

In addition, throughout the specification, when referring to “on a plane,” this means when the target portion is viewed from above, and when referring to “in cross section,” this means when a cross section of the target portion is cut vertically and viewed from the side.

In addition, throughout the specification, when referring to "overlapping," this means overlapping up and down in a cross-section, or being located in whole or in part in the same area in a plane.

Below, examples of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Figure 1 is an exploded perspective view of the pedicle screw 100 according to an embodiment of the present invention.

Referring to FIG. 1, the pedicle screw 100 according to an embodiment of the present invention may include a screw 110, a screw head 120, a housing 130, and an inner cap 140. The pedicle screw 100 according to this embodiment is not limited to the screw 110, screw head 120, housing 130, and inner cap 140 shown in FIG. 1, and includes a rod 150 and a set screw. Additional components necessary for the operation of the pedicle screw 100, such as 160, may be further included.

In addition, the terms top, bottom, front, rear, front, plane, side, and bottom according to this embodiment are used for convenience of explanation, and the terms used in each component according to the embodiment of the pedicle screw 100 It can exist and move in different forms.

2A to 2C are diagrams illustrating portions of a perspective view, a front view, and a cross-sectional view of a screw according to an embodiment of the present invention.

2A and 2B, the screw 110 includes a screw top 112 and a threaded portion 114.

The upper part of the screw 112 is a part that is coupled to the screw head 120. For example, after being assembled with the screw head 120, a part of the upper part of the screw 112 is tapered (112) to prevent the coupling from being separated. It may be a tapered area 1121 implemented in a tapered shape, but is not limited to this.

A portion of the threaded portion 114 is a portion where the pedicle screw 110 is actually inserted into the spine, and the threaded portion 114 may have a sharp end to facilitate insertion into the spine, but is not limited thereto.

FIG. 2C is a cross-sectional view of a portion of the screw top 112 and the screw portion 114. The screw upper portion 112 further includes a screw recess portion 1122. The screw recess portion 1122 according to this embodiment is in a hexagonal shape in order to use a tool used when inserting the pedicle screw 100 into the bone, for example, a screw driver. It may be possible, but it is not limited to this.

3A to 3C are diagrams showing a first perspective view, a second perspective view, and a cross-sectional view of a screw head according to an embodiment of the present invention.

3A to 3C, the screw head 120 has an upper end 121, a lower end 122, a first movement control unit 123, a step 124, a slot 125, a groove 126, and a taper. It may include the shape area 127, but is not limited thereto, and may further include other components necessary for the operation of the pedicle screw 100.

3A and 3B show a first and second perspective views, respectively, showing the screw head 120 as seen from the top, and the second perspective view is different from the first perspective view to show a part not observed in the first perspective view. It shows a perspective view from a different perspective.

Hereinafter, the screw head 120 will be described in more detail with reference to FIGS. 1, 2A to 2C, and 3A to 3C.

The screw head 120 is coupled to the screw 110 and includes a first movement control unit 123 provided flatly to control the movement of the screw 110. For example, the screw head 120 has a sphere shape penetrating in the upper and lower directions and includes two first movement control units 123 located at symmetrical positions on the outer surface.

To describe the screw head 120 in more detail, the upper part 121 is in surface contact with the recess of the inner cap 140, and the lower part 122 is the first receiving part of the housing 130 ( It is in surface contact with 131) in FIG. 5A. Additionally, the upper end 121 and the lower end 122 penetrate each other, so the screw 110 can be assembled by penetrating the upper end 121 and the lower end 122.

The first movement control unit 123 is a flat area to control the movement of the screw 110, and may be present on the outer surface of the screw head 120. In more detail, as shown in FIG. 3C, two first movement control units 123 may be present at symmetrical positions on the outer surface of the screw head 120 having a spherical shape. When the screw head 120 is coupled to the screw 110, the first movement control unit 123 contacts the second movement control unit of the housing 130, thereby controlling the movement of the screw 110.

For example, by the first movement control unit 123 of the screw head 120, the screw 110 can only move in one plane and in another plane, for example, in the medial-outside direction. Movement can be restricted to a plane in the lateral direction. To explain in more detail, movement in the left and right directions, for example, the medial-lateral direction, can be restricted based on the sagittal plane of the human body. Accordingly, it is possible to prevent the pedicle screw 100 from moving in a plane that the user does not want.

The step portion 124 may be provided on both left and right end surfaces of the first motion control portion 123. For example, the step portion 124 occurs at the edge of the first band of the housing 130 when the screw 110 moves in the vertical direction, for example, when moving in the sagittal plane. This can prevent jamming. This will be explained in more detail in Figure 6.

The slot 125 and the groove 126 provide elastic force when the screw 110 is assembled with the screw head 120. As the screw head 120 is implemented so that it can be opened within the elastic section by the slot 125 and the groove 126 provided in the screw head 120, the screw 110 can be easily inserted into the screw head 120. After the screw 110 and the screw head 120 are assembled, the screw 110 and the screw head 120 are fixed in a stable state. In addition, the slot 125 and the groove 126 are implemented in a form that can have elasticity, as described above, or are implemented in a form that can have elasticity, or are implemented in a form that can have elasticity using an elastic material. It can be implemented. For example, any elastic medical material such as nitinol, stainless steel 304, etc. can be used without restrictions.

Referring to FIG. 3C, the tapered region 127 is a part assembled to the tapered region 1121 of the screw 110, and includes the tapered regions 1121 and 1121 provided on each of the screw 110 and the screw head 120. 127), assembly between the two can be easy. In addition, the maximum diameter of the tapered shape, which is the part with the largest diameter 1271 among the tapered area 127, is larger than the diameter of the lower end 122 of the screw head 120 to prevent separation after assembly with the screw 110. It can be implemented to have a value.

FIGS. 4A to 4D are diagrams showing a front view, a right side view, a left side view, and a partial cross-sectional view of the combined state of the screw and the screw head according to this embodiment. Figures 4a, 4b, and 4c show a front view, a right side view, and a left side view, respectively, but may be views from different perspectives depending on the usage environment.

Referring to FIGS. 4A to 4D, the screw 110 is inserted through the upper and lower portions of the screw head 120, and the shape of the upper screw 112 and the internal shape of the screw head 120 are identical. In this way, the screw upper part 112 can be easily assembled and coupled to the screw head 120.

To describe the assembly in more detail, the screw 110 can be easily assembled by utilizing an elastic section according to the elastic force of the slot 125 and the groove 126 provided in the screw head 120.

As shown in FIGS. 4B and 4C, when the screw upper part 112 of the screw 110 is assembled with the screw head 120, the screw upper part 112 can be easily assembled to the screw head 120. A slot 125 and a groove 126 may be implemented in the screw head 120. For example, the gap in the slot 125 and the groove in the groove 126 allow the upper part of the screw 112, which has a relatively large diameter compared to the screw portion 114, to be assembled to the screw head 120, After the upper screw 112 is assembled to the screw head 120, the coupled state may be fixed.

Referring to FIG. 4D, as the tapered area 127 of the screw head 120 and the tapered area 1121 of the screw 110 are assembled using the tapered shape and the bottom step, the screw 110 and the screw head Once assembled, (120) is not easily separated.

In addition, the screw 110 and the screw head 120 according to this embodiment are implemented to enable axis rotation about the axial direction of the pedicle screw 100. Accordingly, a device is used to insert the pedicle screw 100 into the spine through the screw recess portion 1122, and by using the device, the screw 110 and the screw 110 are used to easily insert the screw 110 into the spine. The screw head 120 can be rotated on its axis.

5A and 5B are diagrams showing a perspective view and a cross-sectional view of the housing according to this embodiment.

Referring to FIGS. 5A and 5B, the housing 130 includes a first accommodation unit 131, a first band 132, a second movement control unit 1321, a second accommodation unit 133, and a second band 134. ), a rod receiving portion 135, and a female screw 136.

The housing 130 according to this embodiment may be combined with the screw head 120. At this time, the screw head 120 may be a screw head 120 to which a screw 110 is coupled. Hereinafter, the housing 130 will be described in more detail with reference to the screw 110 and the screw head 120 shown in FIGS. 1 to 4D.

The first receiving portion 131 has a spherical shape and is in surface contact with the lower end 122 of the screw head 120. The first accommodating portion 131 according to this embodiment may be implemented in the form of a bore.

The first band 132 is implemented in a circular shape on the inner surface of the housing 130, and may include a second movement control unit 1321 corresponding to a straight section of the circular shape. For example, to explain in more detail, the first band 132 is implemented in a circular shape with two straight sections, and in this case, each of the two straight sections can be a second motion control unit 1321. The shape of the first band 132 will be described in more detail with reference to FIG. 6.

Figure 6 shows a plan cross-sectional view of the housing 130 cut in the left and right planes (horizontal planes) to explain the shape of the first band 132 of the housing according to this embodiment. As shown in FIG. 6, the circular first band 132 provided on the inner surface of the housing 130 has two straight sections, and the corresponding straight sections can become the second motion control unit 1321. That is, the first band 132 may have two second motion control units 1321 at positions that can be contacted with the first movement control units 123. The housing 130 according to the present embodiment has been described as an example in which there are two second motion control units 1321, but the housing 130 is not limited to this, and includes one or three or more units equal to the number of first movement control units 123. A second motion control unit 1321 may exist.

Additionally, the first band 132 has four corner portions 600 at each of the two straight sections, that is, at the end point of the second motion control unit 1321. In more detail, when the pedicle screw 100 moves in the vertical direction, for example, when moving in the sagittal plane, the corner portion 600 of the first band 132 of the housing 130 Since a jamming phenomenon may occur in the fields, in order to prevent this, the screw head 120 is implemented to include a step portion 124.

Referring again to FIGS. 5A and 5B, the housing 130 according to the present embodiment may include a second movement control unit 1321 provided to contact the first movement control unit 123 of the screw head 120. there is. At this time, the first motion control unit 123 and the second motion control unit 1321 may be in surface contact, but are not limited to this. For example, as the flat part of the first motion control unit 123 comes into surface contact with the straight part, that is, the flat part, of the second motion control unit 1321, the movement of the screw 110 can be controlled.

Accordingly, the pedicle screw 100 according to this embodiment is implemented to be movable only on a single plane (uniplanar). That is, the pedicle screw 100 is implemented to be movable only on one desired plane, and due to the resulting reflection effect, the movement of the pedicle screw 100 in directions other than the movable plane may be restricted. For example, the movement of the pedicle screw 100 in the medial-lateral direction may be restricted, but the movement is not limited thereto.

The second accommodating part 133 may be a space where the inner cap 140 and the screw head 120 are located, and the second accommodating part 133 may be implemented in the form of a bore.

The second band 134 is implemented in a circular shape on the inner surface of the housing 130. The second band 134 according to this embodiment is a part where the inner cap 140 is assembled, and has a step so that the inner cap is not separated after being assembled. At this time, the inner cap may be assembled to the second band 134 according to the interference fit method.

The rod receiving portion 135 is a portion where the rod of the pedicle screw 100 is seated and may be implemented in the form of a U-Channel.

The female screw 136 is a place where the set screw 160 is seated, and may have various shapes depending on the thread shape of the set screw. For example, it may have a square screw shape.

7A to 7D are diagrams showing a front view, a left side view, a top view, and a bottom view of the housing according to this embodiment. Since the description related to FIGS. 5A to 6 also applies to FIGS. 7A to 7D, overlapping descriptions will be omitted.

The inner cap 140 is a part where a portion of the upper end 121 of the screw head 120 is accommodated and the second band 134 of the housing 130 is assembled. Hereinafter, with reference to FIGS. 8A to 8C, the inner cap 140 will be described in more detail.

Figures 8a to 8c are diagrams showing a perspective view, a cross-sectional perspective view, and a front cross-sectional view of the inner cap according to this embodiment. Hereinafter, with reference to FIGS. 1 to 8C, the inner cap 140 will be described in more detail.

The inner cap 140 may include an inner cap band 142, an opening 144, and an inner cap recess 146. As shown in Figure 8b, the inner cap band 142 is configured to allow the inner cap 140 and the housing 130 to be assembled according to the interference fit method with the second band 134 of the housing 130. It is implemented. For example, since the inner cap band 142 is slightly larger than the diameter of the second band 134 of the housing 130 and is implemented in a protruding form, an interference fit method can be applied.

The opening 144 shown in FIG. 8C represents a hole through which the instrument used to insert the screw 110 into the bone passes, and the inner cap recess 146 represents the upper end 121 of the screw head 120. ) is partially accommodated, and when assembling the pedicle screw 100 and locking the set screw 160, the inner cap recess portion 146 may be in surface contact with the upper portion 121 of the screw head 120. there is.

Figure 9 is a diagram showing a portion of a front cross-sectional view of the pedicle screw according to this embodiment. Referring to Figure 9, the pedicle screw 100 shows a front cross-sectional view of the screw 110, screw head 120, housing 130, and inner cap 140 in an assembled state. Descriptions related to the assembly of the screw 110, screw head 120, housing 130, and inner cap 140 have been described in detail in FIGS. 1 to 9C, so overlapping descriptions will be omitted.

Referring to the contact area 1000 of FIG. 9, the first movement control unit 123 of the screw head 120 and the second movement control unit 1321 of the first band 132 of the housing 130 coincide with each other and contact each other. Accordingly, the pedicle screw 100 can only move on one plane. At this time, the first motion control unit 123 and the second motion control unit 1321 may be in surface contact, but are not limited to this.

Figures 10a to 10c are views showing a perspective view, front view, and bottom view of the movement of the pedicle screw according to this embodiment. 10A to 10C, the pedicle screw 100 shows a form in which the screw 110, screw head 120, housing 130, and inner cap 140 are assembled, but is not limited thereto. , it can operate in a similar form even in a form that further includes the rod 150 and the set screw 160.

As shown in FIGS. 10A to 10C, the pedicle screw 100 can move only on one plane. Accordingly, since the pedicle screw 100 can be controlled to move only on a plane desired by the user, the usability and stability of the pedicle screw 100 can be improved.

Figure 11 is a diagram showing a portion of a side cross-sectional view of the pedicle screw according to this embodiment. Referring to FIG. 11, the pedicle screw 100 shows a form in which the screw 110, the screw head 120, the housing 130, and the inner cap 140 are assembled and combined, but the pedicle screw 100 is not limited to this. When the screw 110 is inserted, the rod 150 and the set screw 160 may be further included.

As shown in FIG. 11, the housing 130 and the screw 110 can rotate independently with respect to the axial direction 1210 of the pedicle screw 100. That is, the housing 130 and the screw 110 can each rotate independently. For example, in a state in which the screw 110, the screw head 120, and the housing 130 are assembled, the screw 110 is fixed, and the screw head 120 and the housing 130 rotate in the direction 1220. ) can be rotated. The rotation direction 1220 shown in FIG. 11 is an example, and the screw head 120 and housing 130 may rotate clockwise or counterclockwise.

Accordingly, after the pedicle screw 100 is inserted into the spine, when assembling the rod 150 into the rod receiving portion 135 of the housing 130, the housing 130 is moved without additional movement of the screw 110. By rotating, the rod 135 and the rod receiving portion 135 can be stably assembled in a desired direction.

For example, after assembling the screw 110, screw head 120, housing 130, and inner cap 140, the screw 110 can be inserted into the spine using a screw driver. After the screw 110 is inserted into the desired location of the spine, the screw driver is removed, and the rod 150 and set screw 160 are additionally assembled to stably fix the screw 110 inserted into the spine. This is needed.

At this time, in order to stably fix the pedicle screw 100 to the spine, the rod 150 must be assembled so that it is located in an appropriate place. For this purpose, the direction of the rod receiving portion 135 of the housing 130 is adjusted to match the rod 150. ) needs to be the same as the direction in which it will be located.

However, it is not easy to predict where the rod receiving portion 135 of the housing 130 will be located. This is because it is difficult to predict the direction of the rod receiving portion 135 when making fine adjustments to insert the screw 110 into the desired position of the spine.

In the pedicle screw 100 according to this embodiment, the housing 130 and the screw 110 can rotate individually, so the position and direction of the screw 110 previously inserted into the spine are fixed, and the housing ( By rotating only 130, the rod receiving portion 135 of the housing 130 can be positioned in a desired direction. Therefore, the pedicle screw 100 according to this embodiment can prevent the problem of the position of the screw 110 already inserted into the spine changing when assembling the rod 150.

Referring again to FIG. 1, the rod 150 is accommodated in the rod receiving portion (135 in FIG. 5B) of the housing 130, and the set screw 160 secures the rod 150 and the housing 130. Hereinafter, the set screw 160 will be described in more detail with reference to FIGS. 12A to 12C.

12A to 12C are diagrams showing a perspective view, plan view, and front cross-sectional view of a set screw according to this embodiment.

The set screw 160 may include a set screw recess portion 162 and an external screw 164. The set screw recess portion 162 may have a hexagonal shape in order to assemble a mechanism used to lock the set screw 160, but is not limited thereto. The male screw 164 is a thread for fixing the rod 150 and the housing 130, and may have a square shape symmetrical to the female screw 136 of the housing 130, but is not limited thereto.

Figures 13a to 13c are diagrams showing a perspective view, a front cross-sectional view, and a side cross-sectional view of a pedicle screw according to another embodiment of the present invention. Referring to FIGS. 13A, 13B, and 13C, the pedicle screw 100 includes a screw 110, a screw head 120, a housing 130, an inner cap 140, a rod 150, and a set screw ( 160) shows a perspective view of the assembled state, a partial front cross-sectional view, and a side cross-sectional view. Since the description related to the assembly of the pedicle screw 100 has been described in detail in FIGS. 1 to 12C, redundant description will be omitted.

As shown in Figure 13b, the pedicle screw 100 has a first surface contact area 1410 where the first receiving portion 131 of the housing 130 and the lower end 122 of the screw head 120 surface contact. It may have a second surface contact area 1420 where the recessed part of the inner cap (146 in FIG. 8C) and the upper part of the screw head (121 in FIG. 3A) come into surface contact.

The single-plane pedicle screw 100 according to this embodiment can rotate back and forth only on one plane about the central axis and has a structure that prevents movement in other planes. On the other hand, a multi-axis pedicle screw can rotate freely in any direction and in any plane about the central axis. Accordingly, since the pedicle screw 100 according to this embodiment operates only on a single plane, the stability of the pedicle screw 100 can be guaranteed.

An example of the use of the single plane pedicle screw 100 will be described in more detail below as an example. Various types of spinal irregularities (deformities) such as scoliosis, kyphosis, lordosis, etc. can be caused by trauma, tumors, disc degeneration, and disease. These spinal irregularities can cause pain, limit range of motion, or damage the nervous system within the spine. Therefore, treatment for spinal irregularity is necessary, and one example of a treatment method is to adjust a part of the spine and fix the adjusted part. At this time, a method of inserting a plurality of pedicle screws into the spine can be used for fixation.

Spinal irregularities often result in the vertebral body being rotated or curved and positioned misaligned with respect to the cross section based on the central axis of the spine. Treatment for such spinal irregularities involves inserting a plurality of pedicle screws into the spine and housings of the plurality of pedicle screws. A method of assembling one long rod can be used.

When treatment is needed for a case where the vertebral body is bent and misaligned with respect to the cross section, if the vertebral body is corrected using the multi-axis pedicle screw (1500), the multi-axis pedicle screw (1500) has a relatively weak strength to withstand lateral force, so there is a risk of breakage. there is.

On the other hand, when correcting the part where the vertebral body is rotated with respect to the transverse section, if the single-plane pedicle screw 100 according to this embodiment is used, the single-plane pedicle screw 100 can only move in one plane. And since movement in the cross section, that is, in the inner and outer directions, is physically limited by the structure of the single-plane pedicle screw 100, strong rigidity against lateral force can be maintained.

100: Pedicle screw
110: screw
112: Screw upper part
1121: Tapered area
1122: Screw recess portion
114: threaded part
120: screw head
121: upper part
122: lower part
123: First motion control unit
124: Step part
125: slot
126: groove
127: Tapered area
130: housing
131: first receiving part
132: 1st band
1321: Second motion control unit
133: second receiving portion
134: 2nd band
135: Rod receiving portion
136: Female thread
140: Inner cap
142: Inner cap band
144: opening
146: Inner cap recess portion
150: load
160: set screw
162: Set screw recess portion
164: Male thread
600: Corner part
1000: contact area
1210: Rotation direction
1220: Axial
1410: First interview area
1420: Second interview area

Claims (10)

screw;
a screw head coupled to the screw and including a first movement control area provided flatly to control movement of the screw;
a housing coupled to the screw head and including a second movement control area provided to contact the first movement control area; and
A pedicle screw comprising an inner cap accommodated in the housing.
The pedicle screw according to claim 1, wherein the second movement control area is located in a first band among at least two bands on the inner surface of the housing.
In claim 1,
The screw head has a sphere shape penetrating in the upper and lower directions and includes two first movement control areas located at symmetrical positions on the outer surface of the sphere shape,
A pedicle screw, characterized in that the first band provided on the inner surface of the housing has two second movement control areas at positions contactable with the first movement control areas.
The pedicle screw according to claim 3, wherein the first band is implemented in a circular shape with two straight sections, and each of the two straight sections is the second movement control area.
The method according to claim 1, wherein the screw head has a sphere shape penetrating in the upper and lower directions, and further includes a slot and a groove that provide elastic force when the screw is coupled with the screw head. Pedicle screw, characterized in that.
The pedicle screw according to claim 1, wherein the first movement control area and the second movement control area of the pedicle screw are in surface contact.
The pedicle screw according to claim 1, wherein the pedicle screw is movable only on one plane (uniplanar).
The pedicle screw according to claim 1, wherein the screw and the housing are independently rotatable.
The pedicle screw according to claim 8, wherein the housing is rotatable while the screw is fixed.
The method of claim 1, further comprising a rod and a set screw,
The pedicle screw is characterized in that movement in a direction perpendicular to the load axis is restricted by contact between the first movement control area and the second movement control area.