WO2021157762A1

WO2021157762A1 - Osteosynthesis screw for fixing ligament

Info

Publication number: WO2021157762A1
Application number: PCT/KR2020/001699
Authority: WO
Inventors: 이동오; 류석창
Original assignee: 이동오
Priority date: 2020-02-05
Filing date: 2020-02-06
Publication date: 2021-08-12
Also published as: KR102084625B1

Abstract

The present invention relates to an osteosynthesis screw for fixing a ligament, comprising: a screw head unit having a head part formed on one side thereof, and having first threads formed on the outer wall thereof; a screw shaft unit which is manufactured separately from the screw head unit and is coupled to the screw head unit, and which has, on the outer wall thereof, second threads that are the same as the first threads; first and second unit assembly parts which are provided at the screw head unit and the screw shaft unit, respectively, and through which the screw head unit and the screw shaft are assembled; an assembly member inserted into fastening holes respectively formed at the first and second unit assembly parts, so as to assemble the first and second unit assembly parts; and an elastic string elastically coupled to the screw head unit and the screw shaft unit.

Description

Bone joint screws for fixing ligaments

The present invention relates to a bone junction screw for fixing ligaments, and more particularly, since it can provide flexible stability (dynamic fixation) while having its own elasticity unlike existing screws, metal breakage, deformation, and separation of the screw (Loosening) problem can be reduced, and even if there is a problem of breakage, deformation, or separation of the gas coupling screw during fracture treatment, it is a ligament that can provide secondary fixation by using an optional elastic cord (thread). It relates to a bone joint screw for fixing.

Among body parts, especially the ankle, is a joint that is easily damaged in daily life. Ankle ligaments may rupture due to a sprain while going up and down stairs, or an ankle ligament rupture due to sudden breakage during exercise or in daily life.

People who frequently sprain their ankles are unstable ankles and need treatment because they can become a vicious cycle of repeated injuries.

The recovery period varies depending on the severity of ankle ligament rupture. If the ankle ligament is simply stretched, it takes 2-3 weeks to recover, and if it is a partial tear (partial tear), it takes a month or two to recover. However, if the ankle ligament is completely ruptured, surgery is required and it takes ten months to recover.

Of course, the recovery period above cannot be the correct answer because the degree of rupture of each individual is different and the recovery rate is also different for each individual, but basically, the recovery period due to an ankle ligament rupture can be considered to be completely recovered after a few months. However, even in this case, the pain is only gone, and since the damaged ankle ligament becomes weaker through the treatment process, there is the inconvenience of living with a much weaker ankle joint than before.

For example, the amount of activity is reduced compared to before the rupture of the ankle ligament, and the pain is often severe without any special damage even if you live carefully. Above all, the quality of life is extremely low due to restrictions in daily activities, and health problems may occur due to lack of exercise. Therefore, special management is required even after the ankle ligament rupture is healed.

On the other hand, as described above, when surgery is required rather than a rupture of the ankle ligament at the level of natural recovery, the operation of fixing the ankle is accompanied with surgery. In this case, a ligament fixing screw can be used to fix the fractured area to the neighboring ligament.

Most of the screws in the existing orthopedic market are screws with a helical thread composed of a head and a body. These screws simply create a screw thread in the bone and have the purpose of maintaining the reduction of the bone during the treatment period. It consists of a cortical screw), a plate and a locking screw.

However, in the case of using the above-mentioned conventional screw in a site where minute movement or weight-bearing movement occurs during fracture treatment, metal breakage, deformation, and loosening of the screw may occur due to the structural limitations of the screw. Considering that there are problems that may accompany, the need for a new concept of previously unknown ligament fixation screws for osteosynthesis arises.

Prior art documents in the technical field to which the present invention pertains include Korean Patent Publication No. 1164488, Korean Patent Publication No. 1372540, Korean Patent Publication No. 1500116, and Korean Patent Application Laid-Open No. 2015-0116960.

An object of the present invention is, unlike conventional screws, it is possible to provide flexible stability (dynamic fixation) while having its own elasticity, so it is possible to reduce the problems of metal breakage, deformation, and loosening of the screw, and gas during fracture treatment It is to provide a bone joint screw for fixing the ligament, which can provide a secondary fixing force using an elastic string (thread) that can be applied as an option even if there is a problem of breakage, deformation, or separation of the coupling screw.

The object is, the head unit is formed on one side and the screw head unit is formed with a first screw thread on the outer wall; a screw shaft unit manufactured separately from the screw head unit and coupled to the screw head unit, wherein a second screw thread identical to the first screw thread is formed on an outer wall; first and second unit assembly parts respectively provided in the screw head unit and the screw shaft unit, the screw head unit and the screw shaft unit being assembled with each other; an assembly member inserted into the fastening holes respectively formed in the first and second unit assembly parts to assemble the first and second unit assembly parts; And it is achieved by the ligament fixing osseous screw, characterized in that it comprises an elastic line elastically coupled to the screw head unit and the screw shaft unit.

and an elastic string elastically coupled to the screw head unit and the screw shaft unit, wherein the first and second unit assembly parts are formed in a plurality of pieces to form a cylindrical structure when assembled, the screw head unit A plurality of first line installation holes for installation of the elastic string are formed on the screw shaft unit, and a plurality of second line installation holes for installation of the elastic line are formed on the screw shaft unit, and the elastic line includes the plurality of first line installation holes. A first coupling part coupled to one of the first row installations, a second coupling part coupled to one of the plurality of second row installations, and a connection part connecting the first and second coupling parts, the The elastic line is provided with one side open, and an entry direction guide for guiding an initial installation entry direction of the screw shaft unit is provided in an end region of the screw shaft unit, and a cutting edge part is provided around the entry direction guide part. portion) may be provided.

On the other hand, the purpose of the shaft; an entry direction guide formed at one end of the shaft and configured to guide an initial installation entry direction of the shaft; a cutting edge portion formed around the entry direction guide portion; a head portion formed at the other end of the shaft; a first screw thread provided adjacent to the head portion along the longitudinal direction of the shaft; a second screw thread provided adjacent to the entry direction guide part along the longitudinal direction of the shaft, the pitch interval being different from that of the first screw thread, and non-continuous with the first screw thread; a plurality of first row installations provided in an area where the first screw thread is located; And it is also achieved by the ligament fixation bone junction screw, characterized in that it comprises a plurality of second row installation provided in the region where the second screw thread is located.

It further comprises an elastic string connected to the shaft through the first and second line installations to provide an elastic force, wherein the elastic line includes: a first coupling part coupled to one of the plurality of first line installations; a second coupling part coupled to one of the plurality of second row installations; and a connection part connecting the first and second coupling parts, wherein a plurality of through holes may be formed in the shaft between the first thread and the second thread along the circumferential direction and along the longitudinal direction of the shaft. .

According to the present invention, unlike conventional screws, it is possible to provide flexible stability (dynamic fixation) while having its own elasticity, so it is possible to reduce the problems of metal breakage, deformation, and loosening of the screw, and gas bonding during fracture treatment Even if there is a problem of breakage, deformation, or separation of the screw, it has the effect of providing a secondary fixing force by using an elastic string (thread) that can be applied as an option.

1 is a front view of a bone junction screw for fixing ligaments according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG. 1 ;

FIG. 3 is a view showing the rotation of the remaining parts except for the elastic cord in FIG. 2 .

4 is a perspective view of the assembled state of FIG. 4 .

FIG. 5 is a front view of FIG. 4 ;

Figure 6 is an exploded perspective view of the ligament fixation bone junction screw according to the second embodiment of the present invention.

7 is a front view of the remaining parts except for the elastic cord in FIG. 6 .

Figure 8 is an exploded perspective view of the ligament fixation bone junction screw according to the third embodiment of the present invention.

9 is a front view of the remaining parts except for the elastic cord in FIG.

Advantages and features of the present invention, and a method for achieving them, will become 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 will be implemented in various different forms.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention, and to fully inform those of ordinary skill in the art to which the present invention pertains to the scope of the invention. And the invention is only defined by the scope of the claims.

Thus, in some embodiments, well-known components, well-known operations, and well-known techniques have not been specifically described to avoid obscuring the present invention.

Like reference numerals refer to like elements throughout. And the terms used (referred to) herein are for the purpose of describing the embodiments and are not intended to limit the present invention.

In this specification, the singular form also includes the plural form unless otherwise specified in the written word. In addition, elements and operations (acts) referred to as 'including (or including)' do not exclude the presence or addition of one or more other elements and operations.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs.

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

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

1 is a front view of a bone junction screw for fixing a ligament according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 4 is a perspective view of the assembled state of FIG. 4 , and FIG. 5 is a front view of FIG. 4 .

Referring to these drawings, when the bone joint screw 100 for fixing the ligament according to the present embodiment is applied, unlike the existing screw, it can provide flexible stability (Dynamic fixation) while having its own elasticity unlike the existing screw, so the screw is damaged (Metal). Breakage), deformation, and loosening problems can be reduced, and even if there is a problem of breakage, deformation, or detachment of the gas coupling screw during fracture treatment, it is possible to use an optional elastic cord (thread) to increase the fixing force secondarily. can provide

The bone joint screw 100 for fixing the ligament according to this embodiment that can provide such an effect is manufactured separately. That is, it has a separate assembly structure of the screw head unit 110 and the screw shaft unit 120, and may be selectively applied according to the length of the bone and the location of the fracture.

For reference, the ligament refers to the strong fibrous connective tissue that connects the bones to the bone before. In order to fix the fractured area to the neighboring ligament during fracture treatment, the osteosynthesis screw for fixing the ligament according to this embodiment (100) can be used.

Of course, in addition to the ligament, the bone joint screw 100 for fixing the ligament according to this embodiment can be used when assembling or fixing a flexible bone, all of which should be said to be within the scope of the present invention. .

If you learn more about the bone joint screw 100 for fixing the ligament according to this embodiment, first, the screw head unit 110 is a structure in which the head part 112 is formed on one side and the first screw thread 111 is formed on the outer wall. am.

In addition, the screw shaft unit 120 is manufactured separately from the screw head unit 110 and is coupled to the screw head unit 110, and the second screw thread 121 forming the same pitch structure as the first screw thread 111 on the outer wall. This is the structure being formed.

An entry direction guide 127 for guiding the initial installation entry direction of the screw shaft unit 120 is provided in the end region of the screw shaft unit 120 . Due to the entry direction guide 127, the entry direction can be well guided during the initial installation of the bone junction screw 100 for fixing the ligament according to this embodiment. Therefore, it can be precisely implanted in a desired area.

In addition, a cutting edge portion 128 is provided around the entry direction guide portion 127 . Due to the sharp tip forming the cutting edge portion 128, the implantation of the bone junction screw 100 for fixing the ligament according to the present embodiment can be further facilitated.

When the screw head unit 110 and the screw shaft unit 120 are assembled, one screw may be formed. For their assembly, the screw head unit 110 and the screw shaft unit 120 have a screw head. First and second

unit assembly parts

114 and 124 for assembling the unit 110 and the screw shaft unit 120 to each other are formed.

The first and second

unit assembly parts

114 and 124 are formed into a plurality of pieces to form a cylindrical structure when assembled. That is, when the first and second

unit assembly parts

114 and 124 constituting the sculptural structure as shown in the enlarged parts of FIGS. 3 and 4 are assembled with each other, a cylindrical structure may be formed. Therefore, it is helpful for implantation. Fastening

holes

115 and 125 are respectively formed in the first and second

unit assembly parts

114 and 124 .

A pin-type assembly member 130 is assembled to the assembly portion of the first and second

unit assembly parts

114 and 124 . That is, the assembly member 130 is inserted into the first and second fastening holes 115 and 125 respectively formed in the first and second

unit assembly parts

114 and 124 to assemble the first and second

unit assembly parts

114 and 124 . do

Since the first and second

unit assembly parts

114 and 124 should not be arbitrarily separated, the assembly member 130 may be assembled to the first and second fastening holes 115 and 125 in an interference fit manner. Of course, in addition to this method, an assembly method of fine screws may be applied. These may be implemented with a biocomposite material or the like.

On the other hand, the elastic cord 140 may be further applied to the bone joint screw 100 for fixing the ligament according to the present embodiment.

The elastic line 140 is a line (line, line) elastically coupled to the screw head unit 110 and the screw shaft unit 120, and is an option applied. That is, if the elastic cord 140 that can be applied as an option is used, it is possible to provide a secondary fixing force even if there are problems such as metal breakage, deformation, and loosening of the gas coupling screw during fracture treatment.

A plurality of first line installation holes 116 are formed in the screw head unit 110 for installation of the elastic string 140 , and a plurality of second line installation holes 126 are formed in the screw shaft unit 120 . .

The elastic cord 140 includes a first coupling portion 141 coupled to one of the plurality of first line installation holes 116 and a second coupling portion coupled to one of the plurality of second line installation portions 126 ( 142) and a connection portion 143 connecting the first and

second coupling portions

141 and 142.

In this embodiment, since the elastic cord 140 is provided with one side open, the first coupling portion 141 is coupled to one of the plurality of first string installation holes 116 formed in the screw head unit 110, By coupling the second coupling portion 142 to one of the plurality of second string installation holes 126 formed in the screw shaft unit 120 , the elastic string 140 may be installed tautly.

After assembling the bone joint screw 100 for fixing the ligament in this way, it can be used for fracture treatment. , there is an advantage of being able to provide a secondary fixing force even if a looseening problem occurs.

According to this embodiment, which operates in the structure as described above, unlike existing screws, it is possible to provide flexible stability (dynamic fixation) while having its own elasticity, so the problem of metal breakage, deformation, and loosening of the screw In the event of breakage, deformation, or separation of the gas coupling screw during fracture treatment, it is possible to provide secondary fixation force using an optional elastic string (thread).

Figure 6 is an exploded perspective view of the bone junction screw for fixing the ligament according to the second embodiment of the present invention, Figure 7 is a front view of the remaining portion except for the elastic cord in Figure 6 .

Referring to these drawings, the bone joint screw 200 for fixing the ligament according to the present embodiment can also be used when fixing the ligament (or the bone that can be assembled or has flexibility) during fracture treatment, Otherwise, it has an integrated structure rather than a separate type.

The bone joint screw 200 for fixing the ligament has a shaft 210 . An entry direction guide 211 is provided at one end of the shaft 210 for guiding the initial installation entry direction of the shaft 210 . Due to the entry direction guide 211, the entry direction can be well guided during the initial installation of the bone junction screw 200 for fixing the ligament according to this embodiment.

In addition, a cutting edge portion 212 is provided around the entry direction guide portion 211 . Due to the sharp tip forming the cutting edge portion 212, the implantation of the bone junction screw 200 for fixing the ligament according to the present embodiment can be further facilitated.

A head portion 220 is formed at the other end of the shaft 210 . Putting the tool on the head 220, the bone junction screw 200 for fixing the ligament can be implanted at the corresponding position.

On the other hand, the first screw thread 231 is formed adjacent to the head 220 in the longitudinal direction of the shaft 210 . In addition, a second screw thread 232 is formed adjacent to the entry direction guide 211 in the longitudinal direction of the shaft 210 .

At this time, the second screw thread 232 is formed to have a different pitch interval than the first screw thread 231 and is discontinuous with the first screw thread 231 . In this embodiment, the pitch interval of the second thread 232 is formed larger than that of the first thread 231 . In the case of the first screw thread 231, two mountains are alternately connected, and due to this structure, it is possible to avoid the compression effect of the shinbone during screw insertion (implantation).

A plurality of first row installation holes 233 are formed in an area where the first screw thread 231 is located, and a plurality of second row installation holes 234 are formed in an area where the second screw thread 232 is located. And, the elastic string 240 may be coupled to the shaft 210 via the first line installation hole 233 and the second line installation hole 234 .

The elastic cord 240 may provide a secondary fixing force when the shaft 210 does not function properly, such as broken.

The elastic cord 240 may take the same shape as the above-described embodiment. That is, the elastic cord 240 is a first coupling portion 241 coupled to one of the plurality of first line installation holes 233 , and a second coupling portion coupled to one of the plurality of second line installation portions 234 . 242 and a connection part 243 connecting the first and second coupling parts 241,242 may be included.

Even if the bone joint screw 200 for fixing the ligament of the one-piece structure as in this embodiment is applied, unlike the existing screw, it can provide flexible stability (Dynamic fixation) while having its own elasticity unlike the conventional screw, so that the screw is damaged (Metal Breakage), deformation, Loosening problems can be reduced, and even if breakage, deformation, or separation of the gas coupling screw occurs during fracture treatment, an optional elastic cord (thread) can be used to provide secondary fixing force.

Figure 8 is an exploded perspective view of the ligament fixation bone junction screw according to the third embodiment of the present invention, Figure 9 is a front view of the remaining portion except the elastic cord in Figure 8.

Referring to these drawings, the bone junction screw 300 for fixing the ligament according to the present embodiment is also used when fixing the ligament (or the bone that can be assembled or has flexibility) during fracture treatment, and the structure is the second It is substantially the same as an Example.

However, along the circumferential direction of the shaft 310 between the first screw thread 231 and the second screw thread 232 in the bone joint screw 300 for fixing the ligament according to the present embodiment, the longitudinal direction of the shaft 310 A plurality of through holes 311 are formed along the. The through holes 311 may be utilized when hooking or fitting the elastic cord 240 or other tensile force providing means. The through hole 311 may be variously varied, such as a line, an ellipse, a polygon, etc. in addition to a simple circle, and it should be said that all of these items fall within the scope of the present invention.

Even if the bone joint screw 300 for fixing the ligament of the one-piece structure as in this embodiment is applied, unlike the existing screw, it can provide flexible stability (Dynamic fixation) while having its own elasticity, thus causing metal breakage, deformation, Loosening problems can be reduced, and even if breakage, deformation, or separation of the gas coupling screw occurs during fracture treatment, an optional elastic cord (thread) can be used to provide secondary fixing force.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations fall within the scope of the claims of the present invention.

* Explanation of symbols *

100: bone joint screw for fixing ligament 110: screw head unit

111: first thread 112: head portion

114: first unit assembly part 115: first fastening hole

116: first row installation part 120: screw shaft unit

121: second thread 124: second unit assembly part

125: second fastening hole 126: second row installation hole

127: entry direction guide 128: cutting edge portion

130: assembly member 140: elastic string

141: first coupling part 142: second coupling part

143: connection part

Claims

a screw head unit having a head portion formed on one side and a first screw thread formed on an outer wall;

a screw shaft unit manufactured separately from the screw head unit and coupled to the screw head unit, wherein a second screw thread identical to the first screw thread is formed on an outer wall;

first and second unit assembly parts respectively provided in the screw head unit and the screw shaft unit, the screw head unit and the screw shaft unit being assembled with each other; and

Bone joint screws for fixing ligaments, characterized in that it includes an assembly member inserted into the fastening holes respectively formed in the first and second unit assembly parts to assemble the first and second unit assembly parts.
According to claim 1,

Further comprising an elastic string elastically coupled to the screw head unit and the screw shaft unit,

The first and second unit assembly parts are formed of a plurality of pieces to form a cylindrical structure when assembled,

A plurality of first line installation holes for installation of the elastic line are formed on the screw head unit, and a plurality of second line installation holes for installation of the elastic line are formed on the screw shaft unit,

The elastic line includes a first coupling portion coupled to one of the plurality of first line installations, a second coupling portion coupled to one of the plurality of second line installations, and the first and second coupling portions It includes a connecting part for connecting,

The elastic cord is provided with one side open,

The end region of the screw shaft unit is provided with an entry direction guide for guiding the initial implantation entry direction of the screw shaft unit, and a cutting edge portion is provided around the entry direction guide portion. Bone joint screws for fixing.
shaft;

an entry direction guide formed at one end of the shaft and configured to guide an initial installation entry direction of the shaft;

a cutting edge portion formed around the entry direction guide portion;

a head portion formed at the other end of the shaft;

a first screw thread provided adjacent to the head portion along the longitudinal direction of the shaft;

a second screw thread provided adjacent to the entry direction guide part along the longitudinal direction of the shaft, the pitch interval being different from that of the first screw thread, and non-continuous with the first screw thread;

a plurality of first row installations provided in an area where the first screw thread is located; and

Bone joint screws for fixing ligaments, characterized in that it comprises a plurality of second row installations provided in the region where the second screw thread is located.
4. The method of claim 3,

It further comprises an elastic string connected to the shaft through the first and second line installation holes to provide an elastic force,

The elastic cord is

a first coupling part coupled to one of the plurality of first row installations;

a second coupling part coupled to one of the plurality of second row installations; and

It includes a connecting portion connecting the first and second coupling portion,

Bone joint screw for fixing ligaments, characterized in that the shaft between the first screw thread and the second screw thread is formed with a plurality of through holes along the circumferential direction and along the longitudinal direction of the shaft.