KR101599607B1 - Screw fixing apparatus - Google Patents

Abstract

The screw fastening device according to an embodiment includes a screw that can be inserted into a human body and a screw anchor having an internal space for inserting the screw, and before the screw is inserted into the human body, the screw anchor is inserted, It is possible to prevent loosening.

Description

SCREW FIXING APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw fastening device, and more particularly, to a screw fastening device capable of improving the fastening force of a screw inserted into a human body.

Generally, in the treatment of spinal-related diseases, a direct treatment method of correcting and fixing the vertebrae is implemented by indirect treatment through physiotherapy and a separate fixation device on the damaged vertebra.

In other words, physiotherapy is performed when the spinal disease is mild. However, when the disease is severe in the cervical spine, thoracic spine, lumbar spine, sacrum and intervertebral disc, the patient is treated with a separate spinal fixation device.

The configuration of a commonly used spinal fixation device includes a vertebra screw and a vertebral column that are inserted at a predetermined angle and depth into the vertebral body of the vertebra or the sacrum so that the damaged vertebrae can be calibrated to a normal state and then fixed without movement A spinal rod positioned at one side, and a fixing cap or coupling body for connecting the spinal rod and the pedicle screw in conjunction with each other.

The vertebrae consist of 32 to 35 vertebrae and intervertebral discs between each vertebrae, forming the trunk of the trunk and connecting the upper skull to the lower pelvis. The vertebrae are referred to as cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 5 sacral vertebrae, and 3-5 coccygeal vertebrae. In adults, five sacrum are united to become one sacrum, and 3-5 mica are one coccyx.

The characteristic vertebrae consist of one vertebral body, two pedicle, two lamina, a spinous process on the back, two transverse processes on both sides ) And an articular process.

For the treatment of the injured vertebrae, first, the pedicle screw is inserted and fixed in the proper direction and position on the pedicle or sacrum of the vertebra. Then, the vertebral rod is used to correct the vertebrae in a normal state, And fixing screws are fixed to complete the treatment.

In the case of an open surgery in which the incision of the patient's incision is made longer than the length of the longitudinal axis of the spinal fixation device, the time required for suturing of the incision is long, The surgical wound may be large on the affected part of the patient.

Essentially, the activity of the spinal muscles, especially the erector spinae, is directly related to the posture of the trunk and pelvis and is related to the function of the trunk muscles and the low back disorder . In particular, the degeneration of adjacent nodes after surgery implies that poor results are associated with deformed posture and distorted posture.

In the case of incision, incision and removal / removal of nerve tissue are performed on these muscles, which may lead to negative surgical outcome due to absence of trunk muscle activity after surgery. Increased load may result from pressure applied to the intervertebral disc Increases shear stress. This can lead to disk regression.

Recently, bone diseases have been increasing not only in the spine but also in the elderly.

For example, in Prior Art No. 2006-0133857, filed December 26, 2006, a spinal fixation device is disclosed.

An object of the present invention is to provide a screw fixation device capable of enhancing the fixation force of a screw to a bone when screw loosening occurs due to bone hollowing around the screw after insertion of the screw.

According to one embodiment, the screw anchor is made of a plastic material, and when the screw is inserted into the screw anchor, the internal space of the screw anchor is enlarged so that the connecting element formed between the hole and the hole of the screw anchor is broken, And a screw fastening device.

An object of the present invention is to provide a screw fixing device capable of preventing breakage of a screw anchor when a screw is inserted into a screw anchor by matching the pitch of the screw thread and the pitch of the screw anchor.

An object of the present invention is to provide a screw fixing device having protrusions on the outer surface of a screw anchor to increase the friction coefficient of the screw anchor to the bone surface to obtain sufficient pull strength.

An object of the present invention is to provide a screw fixing device in which a protrusion formed on an outer surface of a screw anchor has a certain direction so that a screw inserted into a screw anchor can be prevented from being detached from the bone.

An object according to an embodiment is to provide a screw fixation device which can use screws of various sizes.

An object of an embodiment of the present invention is to provide a screw fixation device that can be manufactured relatively easily and can be easily applied during surgery.

According to an aspect of the present invention, there is provided a screw fixation apparatus including a screw inserted into a human body and a screw anchor provided with an internal space for inserting the screw, wherein, before the screw is inserted into the human body, So that the screw can be prevented from being loosened.

According to one aspect of the present invention, one end of the screw anchor is provided with an insertion port for insertion of the screw, and the internal space may be formed along the length direction of the screw anchor.

According to one aspect, when the screw is inserted into the screw anchor, the internal space of the screw anchor can be enlarged.

According to one aspect of the present invention, a thread is formed on the surface of the inner space of the screw anchor, and the pitch of the threads of the screw anchor may correspond to the pitch of the threads of the screw.

According to one aspect of the present invention, the outer surface of the screw anchor is provided with a projection for increasing the pulling strength of the screw anchor, and the projection may be formed to be inclined toward the end of the screw anchor into which the screw is inserted.

According to one aspect, the projection may be formed along the longitudinal direction of the screw anchor at the outer surface of the screw anchor.

According to one aspect, the screw anchor is provided with a plurality of holes, and the plurality of holes may be formed from the outer surface of the screw anchor toward the inner space of the screw anchor.

According to one aspect, the plurality of holes may be spaced apart along the longitudinal direction of the screw anchor.

According to one aspect, a connection element is provided between the plurality of holes, and the plurality of holes can be connected by the connection element.

According to one aspect, the connecting element can be broken by an insertion force of the screw to the screw anchor.

According to the screw fastening device according to one embodiment, when the screw loosening phenomenon occurs due to bone halation around the screw after the screw insertion, the fixation force of the screw to the bone can be improved.

According to the screw fastening apparatus according to the embodiment, when the screw anchor is made of plastic material and the screw is inserted into the screw anchor, the internal space of the screw anchor is enlarged so that the connecting element formed between the hole and the hole of the screw anchor is broken, The fixing force can be improved.

According to the screw fastening apparatus according to the embodiment, the pitch of the thread of the screw is matched with the pitch of the screw thread of the screw anchor, so that breakage of the screw anchor can be prevented when the screw is inserted into the screw anchor.

According to the screw fastening apparatus according to one embodiment, the projection on the outer surface of the screw anchor can be provided to increase the coefficient of friction on the bone surface of the screw anchor to obtain sufficient pull strength.

According to the screw fastening apparatus of one embodiment, the protrusion formed on the outer surface of the screw anchor has a certain directionality, and the screw inserted into the screw anchor can be prevented from being detached from the bone.

According to the screw fastening apparatus according to an embodiment, screws of various sizes can be used.

According to the screw fastening apparatus according to one embodiment, the screw fastening apparatus can be manufactured relatively easily and can be easily applied during surgery.

1 is a side view of a screw fixation device according to one embodiment.
2 is a perspective view of a screw anchor in a screw fixation device according to an embodiment.
Figure 3 shows the screw loosening phenomenon.
FIG. 4 shows a screw inserted into a screw anchor in a screw fastening device according to an embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

FIG. 1 is a side view of a screw fixing apparatus according to an embodiment, FIG. 2 is a perspective view of a screw anchor in a screw fixing apparatus according to an embodiment, FIG. 3 shows a screw loosening phenomenon, In which a screw is inserted into a screw anchor.

Referring to FIG. 1, a screw fixation device 10 according to one embodiment may include a screw 100 and a screw anchor 200.

The screw 100 can be inserted into a human body.

Specifically, the screw 100 may be inserted into a vertebra, a tooth, a muscle, or the like. Hereinafter, a screw 100 that can be used in screw fixation for treating a bone-related disease will be described as an example.

For example, screw fixation can be done by screwing the vertebrae firmly to the spine, since the vertebrae are unstable after vertebroplasty (laminectomy).

Therefore, the screw 100 can be made of a titanium material which is excellent in biocompatibility and strength and used for various implant materials. However, the material of the screw 100 is not limited thereto, and may be provided in various materials.

The screw 100 has a predetermined length, and two branches are formed at one end of the screw 100, and a driver (not shown) is inserted between the two branches to tighten the screw 100, .

In addition, threads 102 may be formed on the outer surface of the screw 100.

The thread 102 is for coupling the screw 100 to the screw anchor 200 so that the pitch of the screw thread 102 formed on the screw 100 matches the pitch of the screw thread 212 formed on the screw anchor 200 can do.

The above-described screw 100 can be inserted into the screw anchor 200.

The screw anchor 200 can also be inserted into the human body in the same manner as the screw 100.

Specifically, the screw 100 may be inserted into the screw anchor 200 after the screw anchor 200 is first inserted into the enlarged space in the bone.

This is to prevent the screw 100 from loosening, for example, to prevent the screw 100 from being detached from the bone.

2, the screw anchor 200 can be constructed as follows.

The screw anchor 200 may be made of a plastic material such as PMMA (polymethyl methacrylate).

Accordingly, when the screw 100 is inserted into the screw anchor 200, the screw anchor 200 can be extended and the screw anchor 200 can fill the space expanded in the bone. Therefore, the fixing force of the screw 100 can be improved .

The screw anchor 200 may have a predetermined length and one end of the screw anchor 200 may be provided in a conical shape to facilitate insertion into the bone.

Also, the screw anchor 200 may have an insertion port 202 for insertion of the screw 100.

The insertion port 202 may be formed at one end of the screw anchor 200 and the insertion port 202 may be sized to allow insertion of the screw 100.

The screw 100 may be guided to the inner space 210 of the screw anchor 200 through the insertion port 202 of the screw anchor 200. [

The inner space 210 may extend from one end of the screw anchor 200 having the insertion port 202 to the other end of the screw anchor 200 and extend along the longitudinal direction of the screw anchor 200.

Further, the internal space 210 can be enlarged by the insertion force of the screw 100.

This may be due to the material of the screw anchor 200 as described above.

The inner space 210 of the screw anchor 200 can be opened by the insertion force of the screw 100 while the screw 100 is inserted into the inner space 210 of the screw anchor 200, The diameter of the screw anchor 200 is also increased, so that the screw anchor 200 can fill the hole widened in the bone.

A thread 212 may be formed on the surface of the inner space 210.

The threads 212 may be threaded with the threads 102 of the screw 100 described above.

The pitch of the threads 212 formed in the inner space 210 may match the pitch of the threads 102 formed in the screw 100.

It is possible to prevent a part of the screw anchor 200 from being broken when the screw 100 is inserted into the inner space 210 and to maintain the fixing force of the screw 100 with respect to the screw anchor 200 .

At this time, the fixing force of the screw 100 to the screw anchor 200 may mean the fixing force of the screw 100 to the inside of the human body, for example, the bone.

In addition, protrusions 220 may be formed on the outer surface of the screw anchor 200.

The protrusion 220 may be formed with a certain directionality.

Specifically, the protrusion 220 may be inclined toward the insertion port 202 of the screw anchor 200 toward the end of the screw anchor 200 into which the screw 100 is inserted.

At this time, the protrusion 220 may be formed along the longitudinal direction of the screw anchor 200 on the outer surface of the screw anchor 200.

For example, the protrusion 220 may be formed on the entire outer surface of the screw anchor 200. However, the present invention is not limited to the formation of the protrusions 220 but may be formed on both sides of the external surface of the screw anchor 200 facing the longitudinal direction of the screw anchor 200 or on a part of the external surface of the screw anchor 200 .

Thus, the coefficient of friction of the screw anchor 200 with respect to the bone surface can be increased, and a sufficient pull-out strength can be obtained.

In addition, since the protrusion 220 has a certain directionality, not only the screw anchor 200 but also the screw 100 inserted into the screw anchor 200 can be prevented from being detached from the bone.

In addition, the screw anchor 200 may have a hole 230 formed therein.

The hole 230 may be formed from the outer surface of the screw anchor 200 toward the inner space 210 of the screw anchor 200.

At this time, a plurality of holes 230 may be provided.

The plurality of holes 230 may be disposed apart from each other in the longitudinal direction of the screw anchor 200.

For example, the plurality of holes 230 may be provided in four, and the four holes 230 may be linearly arranged with a rectangular cross-section along the longitudinal direction of the inner space 210.

However, the shape and arrangement of the holes are not limited to these, and may be provided in various forms.

For example, the number of holes 230 may be four, and the shape of the holes 230 may be circular or polygonal. Or the plurality of holes 230 may be radially disposed along the longitudinal direction of the inner space 210. [

When the protrusion 220 is formed on a part of the screw anchor 200, a hole 230 may be formed in a portion of the screw anchor 200 where the protrusion 220 is not formed.

A connecting element 240 may be provided between the plurality of holes 230 formed as described above.

A plurality of holes 230 may be connected by the coupling element 240.

The connecting element 240 may be integrally formed with the screw anchor 200 or may be provided as a separate component from the screw anchor 200.

When the connecting element 240 is provided integrally with the screw anchor 200, the distance between the plurality of holes 230 may be the connecting element 240.

However, when the connecting element 240 is provided separately from the screw anchor 200, the connecting element 240 is disconnected by the insertion force of the screw 100 when the screw 100 is inserted into the screw anchor 200 If possible, it may be provided in any structure or material.

More specifically, when the screw 100 is inserted into the internal space 210 of the screw anchor 200 to enlarge the internal space 210, the interval between the plural holes 230 becomes wider, 240 may be disconnected.

As a result, the engagement between the screw 100 and the screw anchor 200 becomes strong, and the fixing force of the screw 100 and the screw anchor 200 to the bone can be improved.

In this case, the size of the screw 100 does not necessarily coincide with the internal space 210 of the screw anchor 200, and the size of the screw 100 is slightly smaller than the size of the internal space 210 of the screw anchor 200 Can be largely provided.

The screw 10 having various sizes can be used.

In particular, as shown in FIG. 3, the screw 100 may lose fixation force to the bone.

Specifically, the bone may melt around the screw fixed to the bone over time after the screw fixation is performed. This is called Halo, that is, bone cavitation phenomenon, which causes screw loosening phenomenon.

Therefore, near the half of the screwed patients, subsequent screw fixation may cause adjacent nodule degeneration, resulting in a problem with the upper nodule and the lower nodule, requiring reoperation.

In this case, a larger screw may be inserted at the position where the screw loosening occurs, the bone around the screw may be filled with cement, or an allograft bone plug may be inserted. However, it is difficult to obtain a secure fixation of the screw to the bone through this.

The screw fixing device 10 according to the embodiment can improve the fixation force of the screw 100 and the screw anchor 200 to the bones by the coupling structure of the screw 100 and the screw anchor 200. [

Referring to Fig. 4, a screw fixation device 10 according to an embodiment can be applied as follows in screw fixation.

First, a screw anchor 200 is inserted into an enlarged hole in the bone.

At this time, the protrusion 220 formed on the outer surface of the screw anchor 200 has a certain directionality, so that the protrusion 220 is embedded in the hole expanded in the bone, thereby preventing the screw anchor 200 from being detached from the bone.

Then, the screw 100 is inserted into the internal space 210 of the screw anchor 200.

The pitch of the threads 212 formed in the inner space 210 of the screw anchor 200 is the same as the pitch of the threads 102 formed in the screw 100. Therefore, when the screw 100 is inserted into the screw anchor 200 It is possible to prevent the screw anchor 200 from being damaged.

When the screw 100 is inserted into the screw anchor 200, the internal space 210 of the screw anchor 200 is opened.

As a result, the hole 230 formed in the screw anchor 200 becomes large, and as a result, the connecting element 240 between the holes 230 is broken by the insertion force of the screw 100.

As such, the screw 100 is securely fixed in the screw anchor 200, and the screw anchor 200 that is opened can be made more in contact with the widened hole in the bone.

Therefore, the screw fixing device according to one embodiment can improve the fixation force to the bones of the screw when the screw loosening phenomenon occurs due to the bony cavitation phenomenon (Halo) around the screw after the screw insertion, and when the screw anchor is made of plastic material So that when the screw is inserted into the screw anchor, the internal space of the screw anchor is enlarged, and the connecting element formed between the hole and the hole of the screw anchor is broken, so that the fixing force of the screw can be improved. In addition, by providing a projection on the outer surface of the screw anchor to increase the coefficient of friction of the screw anchor to the bone surface, sufficient pull strength can be obtained, various sizes of screws can be used, It can be easily applied.

Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

10: Screw fixing device
100: Screw
102: Threaded
200: Screw anchor
202:
210: inner space
212: Threaded
220: projection
230: hole
240: connection element

Claims (10)

A screw which can be inserted into the human body; And
A screw anchor having an internal space for inserting the screw;
Lt; / RTI >
The screw anchor is inserted before the screw is inserted into the human body, so that the screw can be prevented from being loosened,
Wherein the screw anchor is formed with a plurality of holes, the plurality of holes are formed from the outer surface of the screw anchor toward the inner space of the screw anchor,
Wherein a plurality of holes can be connected by the connecting element, and a connecting element is provided between the plurality of holes.
The method according to claim 1,
Wherein an end of the screw anchor is formed with an insertion hole for inserting the screw, and the internal space is formed along a longitudinal direction of the screw anchor.
The method according to claim 1,
Wherein an inner space of the screw anchor can be enlarged when the screw is inserted into the screw anchor.
The method according to claim 1,
Wherein a screw thread is formed on a surface of the inner space of the screw anchor and a pitch of the screw thread formed on the screw anchor corresponds to a pitch of the screw thread formed on the screw.
The method according to claim 1,
Wherein a projection for increasing a pulling strength of the screw anchor is formed on an outer surface of the screw anchor and the projection is formed to be inclined toward an end of the screw anchor into which the screw is inserted.
6. The method of claim 5,
Wherein the protrusion can be formed along the longitudinal direction of the screw anchor at the outer surface of the screw anchor.
delete The method according to claim 1,
And the plurality of holes can be spaced apart along the longitudinal direction of the screw anchor.
delete The method according to claim 1,
Wherein the connecting element can be broken by an insertion force of the screw to the screw anchor.

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