KR20110045767A - Apparatus for bone fixation - Google Patents

Apparatus for bone fixation Download PDF

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Publication number
KR20110045767A
KR20110045767A KR1020090102465A KR20090102465A KR20110045767A KR 20110045767 A KR20110045767 A KR 20110045767A KR 1020090102465 A KR1020090102465 A KR 1020090102465A KR 20090102465 A KR20090102465 A KR 20090102465A KR 20110045767 A KR20110045767 A KR 20110045767A
Authority
KR
South Korea
Prior art keywords
washer
screw
bone
circumferential surface
plate
Prior art date
Application number
KR1020090102465A
Other languages
Korean (ko)
Inventor
김서곤
김일
이성수
Original Assignee
주식회사 솔고 바이오메디칼
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 솔고 바이오메디칼 filed Critical 주식회사 솔고 바이오메디칼
Priority to KR1020090102465A priority Critical patent/KR20110045767A/en
Publication of KR20110045767A publication Critical patent/KR20110045767A/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
    • A61B17/8047—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers wherein the additional element surrounds the screw head in the plate hole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8695—Washers

Abstract

PURPOSE: An apparatus for bone fixation is provided to prevent a screw from being separated from a plate by firmly combining a washer to a plate. CONSTITUTION: In an apparatus for bone fixation, a screw(10) comprises a head unit(110) and a screw part(120). The head unit has a screw thread(111) in outer circumference. The screw has screw thread(121) in outer circumference. The outer circumference of the head unit is matched with the inner circumference of the washer(20). The washer comprises an upper part and a lower part. The top side has a protrusion. An inner thread is combined with the screw thread of the screw.

Description

Apparatus for bone fixation

The present invention relates to a device for bone fixation, and more particularly, it is composed of a screw inserted into the bone, a washer coupled to the screw, the plate is fastened to the screw coupled to the washer, the lower part of the washer is bone While tightly fixed to the contact surface of the screw to be inserted into the bone, the head of the descending screw is firmly coupled to the inner circumferential surface of the washer, and while firmly engaging the protrusion of the washer with the groove of the plate, the screw is strongly fixed to the plate to provide a locking effect. It relates to a device for bone fixation that can be improved.

In general, the bone fixation device is used to restore the segmented bone. When bone tissue of the human body, such as the tibia, is segmented, the soft tissue of the fracture patient is incised, and then the plate and the screw on the surface of the segmented bone. The bone fixation device can be used to fix and repair the lost area.

Conventionally, the device for bone fixation has been made in such a way that the screw is inserted by processing only holes in the holes inside the plate.

However, such a conventional bone fixation device is a so-called "pull-out" in which the stress is concentrated in the screw area by external load when the long term use is implanted in the patient's body and the screw comes out of the bone and plate hole. There was a risk of developing symptoms, especially in patients with osteoporosis, which requires reoperation.

Therefore, in order to solve the above problems, there is a need to develop a screw for fixing bone of an improved structure that can more securely perform the locking (Locking) between the plate and the screw.

The present invention was devised to solve the conventional problems as described above, and can securely lock between the screw and the plate so that the device for bone fixation is not easily separated from the bone by stress from the outside. There is a technical problem of the present invention to provide a device for bone fixation.

The configuration of the apparatus for bone fixation according to the present invention for achieving the technical problem as described above includes a head portion formed with a screw thread on the outer circumferential surface, and a screw portion extending downward from the head portion and a thread portion formed on the outer circumferential surface, and the outer circumferential surface of the head portion The screw has a shape that is matched with the inner peripheral surface of the washer; The center portion is formed in a ring shape opened up and down, and includes a washer upper portion which protrudes along an outer circumferential surface, and a washer lower portion extending downwardly from the upper washer, wherein the inner circumferential surface of the upper washer and the lower washer A washer having an internal thread coupled with the thread of the screw, the incision being formed with an incision in which a portion of the body is removed longitudinally over the washer and the washer; A plate including a plate-shaped plate main body and at least one locking hole penetrating the upper and lower surfaces of the main body, the inner circumferential surface of the locking hole being formed with grooves shaped to engage with protrusions formed on the outer circumferential surface of the washer; And a control unit.

The device for bone fixation according to the present invention having the above-described structure is not only strongly coupled to the head and the washer, but also has a locking state in which the screw cannot be easily removed from the plate while the washer is strongly coupled to the plate. Even if the screw is not easily separated from the plate, it is a very advanced invention that can prevent the so-called "pull-out" phenomenon that has been pointed out as a conventional problem.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of the preferable Example of the apparatus for bone fixation of this invention is described in detail based on an accompanying drawing.

However, the disclosed drawings are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the invention is not limited to the drawings presented below, but may be embodied in other aspects.

In addition, unless there is another definition in terms used in the present specification, it has the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs, and the gist of the present invention in the following description and the accompanying drawings. Detailed descriptions of well-known functions and configurations that may be unnecessarily blurred are omitted.

1 is an exploded perspective view of the bone fixation device of the present invention, Figure 2 is a partial cutaway cross-sectional view of the combined state of the bone fixation device of the present invention, Figures 3 and 4 are a perspective view and a cross-sectional view of the screw of the bone fixation device of the present invention.

Referring to the drawings, the bone fixing device 1 of the present invention, as shown in Figure 1, the screw 10, the washer 20 coupled to the screw 10, the state in which the washer 20 is coupled It consists of a plate 30 is coupled to the screw 10 of.

The screw 10 is inserted into the bone to function to fix the plate 30 to the bone, screw 10 in a state in which the washer 20 is coupled to the inside of the plate 30 as shown in FIG. Is fastened.

3 and 4, the screw 10 extends downwardly from the head portion 110 and the head portion 110 in which a plurality of threads 111 are formed in a spiral shape on an outer circumferential surface thereof. It has a cylindrical shape and includes a screw portion 120 protruding in a spiral form on the outer circumferential surface thereof.

The upper surface 112 of the head portion 110 is formed with an insertion groove 113 is inserted into the wrench is a tool for separating and coupling the screw 10 to the bone. The outer circumferential surface of the head portion 110 has a shape that matches the inner circumferential surface of the washer 20.

5 and 6 are perspective and sectional views of the washer of the present invention.

The washer 20 is a member that couples the screw 10 to the plate 30, and the washer 20 is formed in a ring shape with a central portion opening up and down.

The washer 20 is formed in a horizontal direction along an outer circumferential surface, and an upper washer 210 having a protrusion 211 protruding in a V shape, and a lower washer 220 extending downwardly from the washer upper 210. ). At this time, the washer lower portion 220, unlike the washer upper portion 210 does not form a protrusion on the outer peripheral surface.

The outer circumferential surface of the washer upper portion 210 has a convex spherical shape in which the outer diameter of the cross section of the center portion is larger than the upper and lower portions.

On the inner circumferential surfaces of the washer upper portion 210 and the washer lower portion 220, a plurality of internal threads 212 coupled to the threads 111 of the screw 10 are spirally formed.

At this time, the inner circumferential surface of the washer 20 in which the internal thread 212 is formed has a shape that is matched with the outer circumferential surface of the head portion 110 as described above.

The washer lower portion 220 provides a friction surface between the washer 20 and the bone when the screw 10 coupled with the washer 20 is inserted into the bone to prevent the washer 20 from slipping from the contact surface of the bone. do.

In addition, when the washer bottom 220 is in close contact with the contact surface of the bone, the washer lower portion 220 is fixed to the contact surface of the bone while the head portion 110 of the screw 10 descending to be inserted into the bone washer 20 It is firmly coupled to the inner circumferential surface of the, and the solid coupling of the head portion 110 and the washer 20 acts as an external force of the washer 20 to increase the inner diameter of the washer 20, the protrusion 211 of the washer 20 ) Is firmly coupled to the groove 321 of the plate 30, the locking effect on the bone of the bone fixation device of the present invention is enhanced.

On the other hand, the washer 20 is formed with an incision 230 to remove a portion of the body in the longitudinal direction over the washer top 210 and the washer bottom 220.

As external force is applied to the inner circumferential surface of the washer 20 due to the cutout 230, the width between both ends of the cutout 230 may increase or decrease. Therefore, the washer 20 is made more firmly coupled to the screw 10 is coupled to the washer 20 by increasing and decreasing the inner and outer diameter of the washer 20 in accordance with the contraction and restoration of the incision 230.

7 is a cross-sectional view of the plate of the present invention.

The plate 30 is a member connecting the segmented bone and the bone, the plate 30 is a plate-shaped plate body 310, and at least one locking hole 320 penetrating the upper and lower surfaces of the body 310 Include.

The locking hole 320 is opened up and down to pass through the screw portion 120 of the screw 10 and then is coupled to the washer 20 coupled with the head portion 110.

The inner circumferential surface of the locking hole 320 has a convex spherical shape in which the cross-sectional inner diameter of the center portion is larger than the upper and lower portions, but is engaged with the washer upper portion 210 of the washer 20.

An inner circumferential surface of the locking hole 320 is formed in a horizontal direction along an inner circumferential surface thereof, and a recess 330 is formed to engage with the protrusion 211 formed on the outer circumferential surface of the washer 20.

On the other hand, the plate 30 preferably has a shape according to the bone shape of the site to be treated.

Hereinafter, the operation of the apparatus for bone fixation 1 of the present invention configured as described above will be described in detail with reference to FIG. 8. 8 is a state diagram used in the bone fixation device of the present invention.

First, the screw 10 is coupled through the opening of the washer 20. When the threaded portion 120 of the screw 10 passes through the opening of the washer 20, the internal thread 212 protruding from the inner circumferential surface of the washer 20 with the thread 111 of the head portion 110 of the screw 10. In contact with the screw 10 is lowered along the internal thread 212, the head portion 110 of the screw 10 is coupled with the washer 20.

Then, as shown in (a) of FIG. 8, the screw 10 in which the washer 20 is coupled enters the lock hole 320 of the plate 30. At this time, the plate 30 is in a state lying on top of the bone (B).

Subsequently, as shown in (b) of FIG. 8, a tool such as a wrench is inserted into the insertion groove 113 formed in the upper surface 112 of the screw 10 in the state where the washer 20 is coupled to rotate the screw 10. When the screw 10 is inserted into the bone while the entire body of the head 110 except for the upper surface 112 of the screw 10 is completely entered into the lock hole 320.

And, due to the entry of the screw 10, the washer lower portion 220 of the washer 20 is fixed on the contact surface (S) with the bone, the washer lower portion 220 to stop the further lowering of the screw 10 By providing a stopper (Stopper) and the friction surface between the washer 20 and the bone (B) to prevent the washer 20 from slipping from the contact surface of the bone.

Next, as shown in (c) of FIG. 8, if the screw 10 is further tightened by using a tool, the washer lower portion 220 is brought into closer contact with the contact surface S of the bone, but the screw 10 is Since the washer 220 is no longer inserted into the bone B, the head portion 110 of the washer 20 is extended by the head portion 110 entering the washer. It is firmly coupled to the inner circumferential surface of the washer 20.

In addition, the solid coupling of the head portion 110 and the washer 20 acts as an external force of the washer 20 to increase the inner diameter of the washer 20, the protrusion 211 of the washer 20 is plate 30 While firmly coupled to the groove 321 of the screw 10 is more strongly coupled to the plate 30, thereby improving the locking effect on the bone of the bone fixing device of the present invention more.

As such, in the state where the screw 10, the washer 20, and the plate 30 are finally coupled, the protrusions 211 formed on the outer circumferential surface of the washer 20 and the inner circumferential surface of the plate 30 are formed grooves 330. ) Are strongly engaged with each other, so that the washer 20 engaged with the screw 10 is kept in a locked state, which cannot be easily removed from the lock hole 320 of the plate 30, so that the screw ( 10 is not easily separated from the plate 30, so that a so-called "pull-out" phenomenon can be prevented.

FIG. 9 shows a washer 20 'of another embodiment of the washer of the apparatus for bone fixation of the present invention, and the V-shaped groove 221 is formed in the washer lower portion 220 of the washer 20 of the present invention described above. It is formed. The groove 221 increases the frictional force between the washer lower portion 220 and the contact surface between the bone when the washer lower portion 220 is in contact with the bone so that the washer 20 is more firmly fixed to the contact surface of the bone. Do this.

In the above description, the configuration and operation of the preferred embodiment of the apparatus for bone fixation of the present invention have been described in detail with reference to the accompanying drawings, but the present invention can be variously modified, changed and replaced by those skilled in the art, and such modifications, alterations and substitutions are possible. Should be construed as falling within the protection scope of the present invention.

1 is an exploded perspective view of the apparatus for bone fixation of the present invention,

Figure 2 is a partial cutaway cross-sectional view of the coupling state of the device for bone fixation of the present invention,

3 is a perspective view of a screw of the apparatus for bone fixation of the present invention,

4 is a cross-sectional view of the screw of the apparatus for bone fixation of the present invention,

5 is a perspective view of a washer of the apparatus for bone fixation of the present invention,

6 is a cross-sectional view of the washer of the apparatus for bone fixation of the present invention;

7 is a cross-sectional view of the plate of the apparatus for bone fixation of the present invention;

8 is a state of use of the apparatus for bone fixation of the present invention,

9 is a perspective view of another embodiment of a washer of the apparatus for bone fixation of the present invention.

Explanation of symbols on the main parts of the drawings

One; Device for bone fixation of the present invention

10; screw

110; Head 111; Thread

112; Upper surface 113; Insert groove

120; Threaded portion 121; Thread

20; washer

210; Washer top

211; Protrusion 212; Internal thread

220; Washer bottom 221; home

230; Incision

30; plate

310; Main body 320; Lock hole

330; Groove

B; bone

Claims (3)

In the bone fixation device having a screw 10, a washer 20 coupled to the screw 10, and a plate 30 to which the screw 10 coupled to the washer 20 is coupled, The screw 10 includes a head portion 110 having a thread 111 formed on an outer circumferential surface thereof, and a screw portion 120 extending downward of the head portion 110 and having a thread 121 formed on an outer circumferential surface thereof. The outer circumferential surface of the head 110 has a shape that is matched with the inner circumferential surface of the washer 20, The washer 20 is formed in a ring shape having a central opening up and down, a washer upper portion 210 having a protrusion 211 protruding along an outer circumferential surface, and a washer extending downwardly of the washer upper portion 210. An inner thread 212 is formed on the inner circumferential surface of the washer upper portion 210 and the washer lower portion 220, the lower portion 220 being coupled to the thread 111 of the screw 10, and the washer upper portion 210. And a cutout portion 230 in which a portion of the body is removed in a longitudinal direction over the washer lower portion 220, The plate 30 includes a plate-shaped plate body 310 and at least one locking hole 320 penetrating the upper and lower surfaces of the body 310, and the washer 20 is formed on an inner circumferential surface of the locking hole 320. Apparatus for bone fixation, characterized in that the groove (330) is formed to be engaged with the protrusion (211) formed on the outer peripheral surface of the. The method of claim 1, Protruding portion 211 formed in the washer top 210 is formed in the transverse direction along the outer peripheral surface of the washer 20, characterized in that the bone fixing device characterized in that protruding in the V-shape. The method of claim 1, A device for bone fixation, characterized in that a V-shaped groove (221) is formed in the washer (220) of the washer (20).
KR1020090102465A 2009-10-27 2009-10-27 Apparatus for bone fixation KR20110045767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090102465A KR20110045767A (en) 2009-10-27 2009-10-27 Apparatus for bone fixation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090102465A KR20110045767A (en) 2009-10-27 2009-10-27 Apparatus for bone fixation

Publications (1)

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KR20110045767A true KR20110045767A (en) 2011-05-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022177191A3 (en) * 2021-02-17 2022-10-13 고려대학교 산학협력단 Orthopedic readjustment system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022177191A3 (en) * 2021-02-17 2022-10-13 고려대학교 산학협력단 Orthopedic readjustment system

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