KR101893116B1 - Bone screw semi locking type bone fixation device - Google Patents

Bone screw semi locking type bone fixation device Download PDF

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Publication number
KR101893116B1
KR101893116B1 KR1020180047760A KR20180047760A KR101893116B1 KR 101893116 B1 KR101893116 B1 KR 101893116B1 KR 1020180047760 A KR1020180047760 A KR 1020180047760A KR 20180047760 A KR20180047760 A KR 20180047760A KR 101893116 B1 KR101893116 B1 KR 101893116B1
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KR
South Korea
Prior art keywords
bone
screw
half
formed
portion
Prior art date
Application number
KR1020180047760A
Other languages
Korean (ko)
Inventor
이동오
Original Assignee
의료법인 명지의료재단
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Publication date
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Priority to KR1020180047760A priority Critical patent/KR101893116B1/en
Application granted granted Critical
Publication of KR101893116B1 publication Critical patent/KR101893116B1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8605Heads, i.e. proximal ends projecting from bone
    • A61B17/861Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/862Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the periphery of the screw head
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/808Instruments for holding or positioning bone plates, or for adjusting screw-to-plate locking mechanisms
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/809Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with bone-penetrating elements, e.g. blades or prongs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B2017/8655Threaded wires, pins or screws; Nuts therefor with special features for locking in the bone

Abstract

More particularly, the present invention relates to a screw fixation device for a screw-half-locking type bone screw, which comprises a bone screw having a thread formed along an outer diameter thereof, a bone screw composed of a downwardly curved head, And a bone plate having at least one half-locking hole formed at a center of the seating surface, wherein the first screw portion is formed downwardly and vertically on the lower surface of the head portion, and on the seating surface of the half- And a second threaded portion having an upright vertical direction corresponding to the first threaded portion is formed so that the first threaded portion and the second threaded portion are vertically coupled to each other.
According to the present invention, when the lower surface of the head of the bone screw is half-locked to the half-locking hole of the bone plate so that the coupling force in the vertical direction does not exist, It is possible to use a thin bone plate which is easy to bend according to the shape, and when the bone screw is rotated backward after the bone union is completed, the bone screw can be extracted more easily.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bone-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone fixation device, and more particularly, to a screw-and-semi-lock type bone fixation device capable of half-locking a bone screw to a bone plate.

In the case of general fracture treatment, a bone fixation device is used in which a soft tissue of a fractured patient is incised, a plate of a metal is supported on the surface of the fractured bone, and the fixation is performed with a screw. Such a bone fixation device usually has a structure in which a hole is formed in a plate and a screw is inserted.

1 is a cross-sectional view of a conventional locking screw plate system. Referring to FIG. 1, in a conventional locking screw metal plate system, a screw is passed through a hole formed in a plate. In the hole of the plate, a horizontal thread is formed along an inner diameter. In order to fasten the screw, A horizontal thread is formed along the outer diameter of the head.

In this way, the screw formed horizontally in the inner diameter of the hole of the plate and the screw formed horizontally in the outer diameter of the screw head are horizontally screwed to each other so that the head of the screw descends to the inside of the hole of the plate, The coupling between the screws is completed.

The conventional screw-coupling method between the plate and the screw has advantages in that it is rich in soft tissues while receiving a large load such as the thighs and hip joints, and is suitable for the treatment of fractures in a region where the plate is not required to be subjected to artificial bending .

In addition, the conventional plate is made of a high-hardness metal material having a relatively large thickness for strongly supporting the fracture site, and in order to more firmly fasten the screw to such a plate, the head of the screw is completely immersed in the hole formed in the plate Screw together.

In the conventional fully locked screw fastening method, since the screw heads are completely fastened to the plate in the horizontal direction, there is an advantage that the fastening force between them is very high. However, such a fastening method is disadvantageous in that it is not suitable for the treatment of the distal femoral fracture in which the plate is directly touched to the skin because the plate thickness is very thick, so that the soft tissue is not so much received. In addition, in such a region, the plate is often artificially bent in accordance with the shape of the bone. However, since the plate is thick and has a high hardness, an artificial bending process is troublesome and difficult and time consuming.

In addition, when the screw which is completely locked to the plate is pulled out in order to remove the still life after completion of the union, the screw is not properly rotated due to an excessively high fastening force between the screw and the plate, which is a very difficult problem in pulling out the screw .

Korean Registered Patent No. 10-1524518 (issued on June 01, 2015)

In order to solve the above problems, it is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to provide a bone screw, in which a lower surface of a head of a bone screw is not half- And to provide a locking type bone fixation device.

It is a further object of the present invention to provide a screw-and-half-locking type bone fixation device capable of improving the fixation force of a bone plate while preserving the periosteum of the bone.

In order to achieve the above object, the present invention provides a screw-half-locking type bone fixation device, comprising: a bone screw having a body portion formed with threads along an outer diameter, a bone screw composed of a downwardly curved head portion, and a bottom portion of the head portion And a bone plate having at least one half-locking hole formed by a downwardly curved seating surface and a through hole formed at the center of the seating surface, wherein a first screw portion is formed downwardly and vertically on a lower surface of the head portion, And a second thread portion upwardly perpendicular to the first thread portion is formed on the seating surface of the hole so that the first thread portion and the second thread portion are vertically coupled to each other.

And the inner diameter of the upper half of the bone plate is smaller than the outer diameter of the upper end of the head of the bone screw.

The bone plate is formed at one side of the half-locking hole and includes a complete locking hole formed with a horizontal thread along an inner diameter.

And a head of a bone screw having a horizontal thread formed along the outer diameter is screwed to the fully locked hole.

And a plurality of spikes are formed on the lower surface of the bone plate, the wedge-shaped spikes protruding downward.

According to the present invention, when the lower surface of the head of the bone screw is half-locked to the half-locking hole of the bone plate so that the coupling force in the vertical direction does not exist, , It is possible to use a thin bone plate which is easy to bend, and when bone union is completed, bone screws can be pulled out more easily when the bone screw is pulled backward.

In addition, the present invention has an effect that a plurality of spikes are formed on the lower surface of the bone plate, and the fixation force of the bone plate on the bone surface is improved due to the increase of frictional force while preserving the periosteum of the bone.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be construed as interpretation.
1 is a cross-sectional view of a conventional locking screw plate system,
FIG. 2 and FIG. 3 are cross-sectional views illustrating a screw half-lock type bone anchoring device according to a first embodiment of the present invention,
FIG. 4 is a perspective view showing a screw half-locking type bone fixation device according to a second embodiment of the present invention, FIG.
FIG. 5 is a plan view of a screw half-locking type bone fixation device according to a second embodiment of the present invention,
6 is a cross-sectional view of a screw half-locking type bone fixation device according to a third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a screw-and-half-locking type bone fixation device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 and FIG. 3 are cross-sectional views illustrating a screw half-locking type bone fixation device according to a first embodiment of the present invention.

Referring to FIGS. 2 and 3, a screw half-locking type bone fixation device according to a preferred embodiment of the present invention comprises a bone screw 100 and a bone plate 200, As follows.

The bone screw 100 has a body portion 110 and a head portion 120. The body portion 110 is a portion that is directly placed on the fractured bone B region and is threaded along the outer diameter to be fixed in the bone B while being rotated into the bone B.

The head 120 has a rotary groove formed on an upper surface thereof engaged with a predetermined rotating tool such as a drive bit and a lower surface formed in a downwardly curved shape toward a lower body portion 110. At this time, the first screw portion 121 is formed vertically downward on the lower surface of the head portion 120. [

The bone plate 200 is brought into contact with the lower surface of the fractured bone B to support the fracture site. At least one half-locking hole 210 is formed in the bone plate 200 so that the body 110 of the bone screw 100 passes through and is fixed in the bone B while rotating. Here, the semi-locking hole 210 is composed of a seating surface 211 and a through hole 212.

The seating surface 211 is a portion where the head 120 of the bone screw 100 is seated and the seating surface 211 is also curved downwardly corresponding to the lower surface of the downward curved head portion 120. At this time, a second screw portion 211a corresponding to the first screw portion 121 formed on the lower surface of the head portion 120 of the bone screw 100 is formed on the seating surface 211, And the first screw portion 121 and the second screw portion 211a are vertically coupled to each other.

Since the inner diameter of the upper end of the half-locking hole 210 of the bone plate 200 is smaller than the outer diameter of the upper end of the head 120 of the bone screw 100, the head 120 of the bone screw 100, Locking hole 210 of the main body 200. That is, only a part of the lower surface of the head 120 of the bone screw 100 is seated on the seating surface 211, and the first screw portion 121 and the second screw portion 211a are vertically coupled to each other.

The vertical first screw portion 121 formed on the lower surface of the head 120 of the bone screw 100 and the vertical second screw portions 211a formed on the half-locking hole 210 of the bone plate 200 The coupling method is such that the lower surface of the head 120 of the bone screw 100 does not have a vertical binding force to the half-locking hole 210 of the bone plate 200, Since the head 120 of the bone plate 100 is not completely immersed in the half-locking hole 210 of the bone plate 200, when the bone screws 100 are pulled backward to remove the still- There is an advantage that the bone screw 100 can be easily pulled out from the semi-locking hole 210 of the plate 200.

In the fracture treatment at a site where the soft tissue is small as in the distal portion of the fibula, it is possible to prevent the bone plate 200 from being directly touched to the skin, Since the bone screw 100 is half-locked to the bone plate 200, the bone screw 100 is inserted into the half-locking hole 210 formed in the bone plate 200, When the bone screw 100 is inserted, the head 120 of the bone screw 100 compresses the bone plate 200 in the vertical direction, and only the horizontal binding force is exerted, (200) bends naturally according to the shape of the bone (B).

A sleeve (not shown) for guiding the drill bit in pre-drilling the surface of the bone B using a drill bit is inserted into the half-locking hole (not shown) before the bone screw 100 is inserted into the half- The bone screw 100 is inserted into the bone with a predetermined variable angle not perpendicular to the bone screw 100 when the bone screw 100 is rotated to apply the bone screw 100 corresponding to the shape of the bone screw 100 The bone screws 100 are not half-locked to the bone plate 200, but have only a horizontal binding force, while the bone screws 100 do not have a binding force in the vertical direction.

FIG. 4 is a perspective view of a screw half-locking type bone fixation device according to a second embodiment of the present invention, and FIG. 5 is a plan view of FIG.

Referring to FIG. 4, the bone plate 200 may further include a full locking hole 300 formed at one side of the half-locking hole 210. Referring to FIG. 5 as another embodiment, a full locking hole 300 may be formed to extend to one side of the half-locking hole 210.

Here, a horizontal thread is formed on the inner side of the fully-locking hole 300 along the inner diameter. At this time, a head 120 'of a bone screw 100' having a horizontal thread formed along the outer diameter is screwed to the full locking hole 300.

The bone screw 100 is semi-locked to the semi-locking hole 210 formed in the bone plate 200 and is composed of a downward curved head 120 having a downwardly directed vertical first screw portion 121, The bone plate 200 is naturally bent so as to conform to the shape of the bone B so that the outline of the bone plate 200 and the bone B are aligned to some extent. The bone screw 100 ', which is composed of the bone screw 100', is fully locked.

6 is a cross-sectional view of a screw half-locking type bone fixation device according to a third embodiment of the present invention.

Referring to FIG. 6, a plurality of spikes 220 may be further formed on the lower surface of the bone plate 200, which are wedge-shaped protruding downward.

In this state, when the bone screw 100 is rotated and inserted so that the bone plate 200 presses the bone, the surface of the bone B is pressed against the surface of the bone B, There is a problem that the periosteum (bone membrane) covering the surface is torn by the bone plate 200 and the periosteum is damaged.

In order to solve such a problem, by forming a plurality of spikes 220 on the lower surface of the bone plate 200, the lower surface of the bone plate 200 and the bone B are in point contact with each other, .

When the bone screw 100 is tightened, the spike 220 is stuck to the surface of the bone B at a short depth due to the pressure of the bone plate 200, and the friction resistance between the bone plate 200 and the bone B This increase in frictional force can improve the fixation force of the bone plate 200 on the bone B surface.

While 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 such variations and modifications are intended to fall within the scope of the appended claims.

100: bone screw
110:
120: Head
121: first screw portion
200: bone plate
210: half-locking hole
211: seat face
211a: second thread portion
212: Through hole
220: Spike
300: Full locking hole

Claims (5)

  1. A bone screw (100) comprising a body portion (110) with an external diameter and a downwardly curved head portion (120); And
    And at least one half-locking hole 210 formed by a downwardly curved seating surface 211 on which a part of the lower surface of the head 120 is seated and a through hole 212 formed in the center of the seating surface 211 A bone plate 200; / RTI >
    The inner diameter of the upper end of the half-locking hole 210 of the bone plate 200 is smaller than the outer diameter of the upper end of the head 120 of the bone screw 100,
    A first screw portion 121 is formed downward and vertically on the lower surface of the head portion 120 and an upwardly facing vertical portion 121 corresponding to the first screw portion 121 is formed on the seating surface 211 of the half- Wherein the first screw part (121) and the second screw part (211a) are coupled to each other in the vertical direction by forming a second screw part (211a) of the second screw part (211a).
  2. delete
  3. The bone plate according to claim 1, wherein the bone plate (200)
    A full locking hole 300 formed at one side of the half-locking hole 210 and having a horizontal thread formed along an inner diameter thereof; Further comprising a second threaded portion and a second threaded portion.
  4. The method of claim 3,
    Characterized in that the head (120 ') of a bone screw (100') with a horizontal thread formed along its outer diameter is screwed into the fully locking hole (300).
  5. The method according to claim 1 or 3,
    A plurality of spikes 220 protruding downward in the shape of a wedge with a pointed end; Is formed on the side of the bone.
KR1020180047760A 2018-04-25 2018-04-25 Bone screw semi locking type bone fixation device KR101893116B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020180047760A KR101893116B1 (en) 2018-04-25 2018-04-25 Bone screw semi locking type bone fixation device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180047760A KR101893116B1 (en) 2018-04-25 2018-04-25 Bone screw semi locking type bone fixation device
PCT/KR2019/003282 WO2019208932A1 (en) 2018-04-25 2019-03-21 Bone fixing device having half-locked screw

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KR101893116B1 true KR101893116B1 (en) 2018-08-30

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WO (1) WO2019208932A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019208932A1 (en) * 2018-04-25 2019-10-31 의료법인 명지의료재단 Bone fixing device having half-locked screw

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120131153A (en) * 2010-02-25 2012-12-04 신세스 게엠바하 Bone plate screw holes convertible to hooks
KR101524518B1 (en) 2007-08-27 2015-06-01 알더 메디이큅 프라이빗 리미티드 Bone plates and bone plate assemblies
JP2015518742A (en) * 2012-05-17 2015-07-06 ブラックストーン メディカル,インコーポレイテッド Anti-retraction mechanism for orthopedic instruments
JP2018047231A (en) * 2016-08-17 2018-03-29 グローバス メディカル インコーポレイティッド Stabilization systems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130064870A (en) * 2011-12-09 2013-06-19 주식회사 탑알앤디 Bone plate system
KR20130097348A (en) * 2012-02-24 2013-09-03 씨앤에스메디칼(주) The neck bone isoscu the structure of the human body
KR101893116B1 (en) * 2018-04-25 2018-08-30 의료법인 명지의료재단 Bone screw semi locking type bone fixation device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101524518B1 (en) 2007-08-27 2015-06-01 알더 메디이큅 프라이빗 리미티드 Bone plates and bone plate assemblies
KR20120131153A (en) * 2010-02-25 2012-12-04 신세스 게엠바하 Bone plate screw holes convertible to hooks
JP2015518742A (en) * 2012-05-17 2015-07-06 ブラックストーン メディカル,インコーポレイテッド Anti-retraction mechanism for orthopedic instruments
JP2018047231A (en) * 2016-08-17 2018-03-29 グローバス メディカル インコーポレイティッド Stabilization systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019208932A1 (en) * 2018-04-25 2019-10-31 의료법인 명지의료재단 Bone fixing device having half-locked screw

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