KR102245477B1 - Bone anchor assemblies for Multi-axial coupling - Google Patents

Abstract

The present invention relates to a bone fixing device that can be fixed by variously changing a fixed screw bone insertion axis direction according to an operation site and situation, and the present invention is in close contact with the bone to be fixed, and a plate in which one or more through holes are formed. ; A lifting nut having an outer periphery formed as an inclined surface and inserted into the through hole, and elevating and descending along the inner side of the through hole; A fixing clip having an incision formed on one side and being inserted under the through hole to prevent the lifting nut from being separated from the through hole; And through the through hole, it is configured to include a fixing screw inserted and fixed to the bone through screwing. According to the present invention, the present invention provides a bone fixing mechanism capable of fixing the fixing screw in various directions according to the shape of the bone to be fixed, but the head of the fixing screw is fixed to the plate through hole by the lifting of the lifting nut. Regardless of the direction, there is an effect that the fixing screw head can be stably fixed in the plate through hole.

Description

{Bone anchor assemblies for Multi-axial coupling}

The present invention relates to a fixing device comprising a plate and a fixing screw to fix a bone for medical purposes, and more particularly, the fixing screw bone insertion axial direction can be variously changed and fixed according to the surgical site and situation. It relates to a bone fixation device.

In general, in the case of a fracture patient, the fracture site is attached by attaching the fracture site to the correct position and immovably fixed until the bones of both sides are united. In this case, there are various methods, representatively, a method of attaching a plate to the bone surface and fastening a screw to both sides of the fractured bone to fix it.

That is, by inserting a screw into the hole of the plate and fastening it with the bone, the plate is compressed and fixed to the bone.

Meanwhile, in recent years, methods of fixing bones have been diversified depending on the condition of the fracture and the affected area. That is, a bone fixation mechanism has been developed and used that has evolved from the conventional coupling method of vertically coupling the fixation screw with respect to the plate to change the angle of the axis of insertion of the fixation screw with respect to the plate according to the state of the bone.

The technology of fixing the fixing screw with respect to the plate in various axial directions ultimately depends on ensuring that the head of the fixing screw is stably fixed in the through hole of the plate even in various axial directions of the fixing screw.

As described above, various types of conventional bone fixation devices capable of multi-axis fixation have been developed and applied, and representative methods are as follows.

First, an example of a bone fixation mechanism capable of multi-axis fixation is a method of forming a screw thread of a fixing screw head in only a part of it and combining it with a plate.

In this case, there is a disadvantage in that the coupling force between the fixing screw and the plate is weak, and when the pressing force is excessively applied, cold bonding occurs between the fixing screw head and the plate, which causes difficulty in disassembling the fixing screw.

Another example of a bone fixation mechanism capable of multiaxial fixation is a method of forming a plate fixing hole in various directions in advance.

In this case, there is a disadvantage in that the fixing screw can be fastened only in a predetermined direction, and there is a problem in that the problem of removing the fixing screw due to cold joining cannot be solved.

Accordingly, in Korean Patent Laid-Open No. 10-2001-0022371, as shown in FIG. 1, a bushing with one side open in the hole of the plate is provided, and as the head of the fixing screw is coupled with the inside of the bushing, the bushing expands in the horizontal direction. Therefore, it has been developed and disclosed in a technology that allows the fixing screw to be fixed to the plate hole.

However, the prior art as described above has the following problems.

That is, in the prior art, since the head of the fixing screw is fixed to the plate hole by the horizontal expansion pressure of the bushing, when the fixing screw has a predetermined inclination with respect to the plate, there is a problem that stable coupling cannot be achieved.

Specifically, in the example shown in FIG. 1, the fixing screw on the right side is inserted in a predetermined inclined direction from a vertical direction with respect to the plate. In this case, the washer expands in an inclined direction within the hole of the plate and It is press-fit.

At this time, if the plate is shaken by an external force (in the illustrated example, when the left end is lifted in a clockwise direction), the washer is released from the press-in fixed position and cannot exert a complete coupling force thereafter.

This problem of disengagement of the washer occurs seriously when the inclination directions of the plurality of fixing screws fixed to the plate are the same, and does not occur significantly when the inclination directions of the fixing screws are various.

Accordingly, when the present prior art is used in a medical field, there is a problem of unnecessarily inserting excessive fixing screws in multiple directions to prevent the washer from being disengaged after surgery.

(001) Korean Patent Application Publication No. 10-2001-0022371

The present invention was conceived to solve the conventional problems as described above, and the present invention provides a bone fixing mechanism capable of fixing a fixing screw in various directions according to the shape of the bone to be fixed, regardless of the axial direction of the fixing screw. It is intended to provide a bone fixing mechanism in which the fixing screw head can be stably fixed in the plate through hole.

In addition, the present invention is a bone fixing mechanism that prevents the problem of cold joint between the fixing screw and the plate by preventing the head of the fixing screw from being directly coupled to the through hole while the head of the fixing screw is stably fixed in the plate through hole. Is to provide.

According to a feature of the present invention for achieving the object as described above, the present invention is in close contact with the bone to be fixed, and a plate in which one or more through holes are formed; A lifting nut having an outer periphery formed as an inclined surface and inserted into the through hole to move up and down along the inner side of the through hole; A fixing clip having an incision formed on one side and being inserted under the through hole to prevent the lifting nut from being separated from the through hole; And through the through hole, it is configured to include a fixing screw inserted and fixed to the bone through screwing.

In this case, the fixing screw includes a body portion having a main screw thread inserted into the bone; And a head having a fixed screw thread for screwing with the lifting nut inserted into the through hole. On the inner circumferential surface of the lifting nut, an inner screw thread corresponding to the fixing screw may be formed.

In addition, a plurality of the through holes may be formed at different positions on the plate and with different sizes.

In addition, the through hole may be formed as an inclined seating surface having an inclined inner surface of which the diameter decreases from the bone junction surface of the plate to the other side.

And on the inclined seating surface, a guide protrusion protruding into the through hole is formed; The outer circumferential surface of the lifting nut is formed with an outer guide groove into which the guide protrusion is inserted; When the lifting nut is raised or lowered, the relative rotation with respect to the penetration may be restricted.

In addition, a protruding jaw may be formed at the lower end of the through hole to restrain the detachment of the inserted fixing clip.

In addition, it is preferable that the lifting nut has an outer circumferential size larger than an upper diameter of the through hole and smaller than a lower diameter of the through hole.

In addition, the lifting nut may have an outer inclined surface having different inclination angles.

In addition, the lifting nut may be formed such that the inclination angle of the outer inclined surface is changed linearly.

The following effects can be expected in the bone fixation device capable of multi-axial coupling according to the present invention as salpinned above.

That is, in the present invention, a bone fixing mechanism capable of fixing the fixing screw in various directions according to the shape of the bone to be fixed is provided, but the head of the fixing screw is fixed to the plate through hole by the elevation of the elevation nut to be fixed regardless of the axial direction. There is an effect that the screw head can be stably fixed in the plate through hole.

In addition, the present invention allows the head of the fixing screw to be stably fixed in the plate through hole while the head of the fixing screw is coupled with the through hole through the lifting nut, so that cold bonding does not occur between the fixing screw and the plate. It works.

1 is an exemplary view showing an example of a multi-axial joint bone fixation device according to the prior art.
Figure 2 is an exploded perspective view showing the configuration of a bone fixing mechanism capable of multi-axial coupling according to the present invention.
Figure 3 is a cross-sectional view showing the inner configuration of the plate through hole constituting the bone fixing mechanism according to the present invention.
Figure 4 is a perspective view showing an example of the lifting nut and the fixing clip constituting the bone fixing mechanism according to the present invention.
Figure 5 is an exemplary view showing a state in which the fixing screw is fastened in the plate through hole in the bone fixing mechanism according to the present invention.
Figure 6 is a cross-sectional view showing another example of the lifting nut constituting the bone fixing mechanism according to the present invention.

Hereinafter, a specific embodiment of a bone fixation mechanism capable of multi-axial coupling according to a specific embodiment of the present invention will be described with reference to the accompanying drawings.

Figure 2 is an exploded perspective view showing the configuration of a bone fixing mechanism capable of multi-axial coupling according to the present invention, Figure 3 is a cross-sectional view showing the inner configuration of the plate through hole constituting the bone fixing device according to the present invention, Figure 4 It is a perspective view showing an example of the lifting nut and the fixing clip constituting the bone fixing device according to the present invention, Figure 5 is an exemplary view showing a state in which the fixing screw is fastened in the plate through hole in the bone fixing device according to the present invention 6 is a cross-sectional view showing another example of the lifting nut constituting the bone fixing mechanism according to the present invention.

First, as shown in FIG. 2, the bone fixing mechanism according to the present invention includes a plate 100, a fixing screw 200, a lifting nut 300, and a fixing clip 400.

The plate 100 is attached to the bone to be fixed and is fixed to the bone by the fixing screw 200. To this end, the plate 100 has one or more through holes 110 for penetrating the fixing screw 200. Is formed.

The plate 100 is manufactured in various shapes and sizes according to the position and shape of the bone to be fixed, and generally, a plurality of through holes 110 are formed in different sizes to penetrate the fixing screw 200 in various positions. Can be.

In this case, the specific shape of the through hole 110 will be described again with reference to FIG. 3.

Meanwhile, the lifting nut 300 and the fixing clip 400 are inserted into the through hole 110 in the direction of the bone junction surface (hereinafter referred to as “lower surface”) of the plate 100.

The lifting nut 300 is configured to be elevating and descending within the through hole 110 in a ring shape with an outer circumference formed as an inclined surface, and the fixing clip 400 has a cutout 410 formed on one side thereof. This is a configuration for preventing the lifting nut 300 from being separated from the through hole 110 under the through hole 110.

In addition, the fixing screw 200 is inserted into the bone and is formed at the end portion of the body 220 fixed to the bone by screwing and coupled to the lifting nut 300 inserted into the through hole 110 ( 210), the body portion 220 is formed with a main screw thread 221 for screwing with the bone, and the head 210 has a fixing screw thread for screwing with the lifting nut 300 ( 211) is formed.

Hereinafter, the configuration of the through-hole of the plate and the configuration of the lifting nut and the fixing clip according to the present invention will be examined with reference to FIGS. 3 and 4.

As shown in FIG. 3, the inner surface of the through hole 110 is an inclined seating surface 111 having an inclined diameter that decreases from the lower surface of the plate 100 to the other side (hereinafter referred to as'upper surface'). Is formed by

This is to ensure that the lifting nut 300 is fixed as the lifting nut 300 is raised and lowered by an interview with the outer inclined surface 310 of the lifting nut 300 to be described later.

In addition, a guide protrusion 113 protruding into the through hole 110 is formed on the inclined seating surface 111.

The guide protrusion 113 is for restraining the rotation of the lifting nut 300 when the lifting nut 300 moves up and down, and the outer side into which the guide protrusion 113 is inserted into the side of the lifting nut 300 Guide groove 330 is formed.

Meanwhile, a protruding jaw is formed at the bottom end of the plate 100 of the through hole 110 to prevent the fixing clip 400 from being separated from the through hole 110 after the fixing clip 400 is inserted. It may be configured to be.

In the inside of the through hole 110 formed as described above, the lifting nut 300 and the fixing clip 400 as shown in FIG. 4 are sequentially inserted from the lower surface of the plate 100.

At this time, the lifting nut 300 has a circular annular shape and an outer circumferential surface is formed with an outer inclined surface 310 inclined in a direction corresponding to the inclined direction of the inclined seating surface 111, and the fixing screw 200 is formed at the inner circumference. In order to be coupled to the head 210 of ), an inner screw thread 320 corresponding to the fixing screw 211 is formed.

Meanwhile, as described above, the outer inclined surface 310 is formed with an outer guide groove 330 into which the guide protrusion 113 of the through hole 110 can be inserted.

Of course, in this case, a groove may be formed in the through hole 110 and a projection corresponding thereto may be formed in the lifting nut 300.

Here, the size of the outer periphery of the lifting nut 300 is larger than the upper diameter of the through hole 110 and smaller than the lower diameter of the through hole 110, so that the lifting nut in the through hole 110 It is preferable that the elevating nut 300 is formed so that the elevating nut 300 cannot be removed from the top of the through hole 110 while the 300 elevates and descends.

Meanwhile, the fixing clip 400 is a ring having an incision 410 formed on one side thereof, and when restored after being inserted into the lower portion of the through hole 110 in an elastically deformed state, the through hole 110 is inserted into the lower jaw of the through hole 110. It is seated and is restricted from being discharged to the outside of the through hole 110.

Hereinafter, a process in which the fixing screw is fastened to the plate in the bone fixing device capable of multiaxial coupling according to the present invention will be described in detail with reference to FIG. 5.

As shown in (a) of Figure 5, the plate 100 is inserted into the through hole 110 and the lifting nut 300, the fixing clip 400 is inserted into the lower end of the lifting nut 300 Fastening of the fixing screw 200 is started while supporting the lifting nut 300.

At this time, the fixing screw 200 is inserted by rotation into the bone to be fixed while the body portion 220 first penetrates the through hole 110.

As the main screw thread 221 of the body part 220 is inserted into the bone, the head 210 of the fixing screw 200 gradually approaches the through hole 110, and the fixing screw 200 head ( The fixing screw thread 211 of 210 is coupled with the inner screw thread 320 of the lifting nut 300.

Thereafter, when the rotation of the fixing screw 200 continues, as shown in FIG. 5 (b), the lifting nut 300 is raised and lowered along the inclined seating surface 111 of the through hole 110, and press-fitted. The fixing screw 200 is fixed in a state where it is no longer lifted or lowered.

At this time, even if the insertion axial direction of the fixing screw 200 is inserted in an inclined direction, as long as the fixing screw 200 does not rotate, the pressing force applied to the lifting nut 300 is not released, and the The fixing screw 200 is stably fixed within the through hole 110.

On the other hand, Figure 6 shows another embodiment of the lifting nut according to the present invention.

The lifting nut 300 ′ according to the present invention illustrated in FIG. 6 is formed at different angles of inclination angles of the outer inclined surface 310.

That is, as shown in Fig. 6, the outer inclined surface 310 is configured to linearly change the inclination angle of the inclined surface from the first outer inclined surface 310A, inclination angle α1 to the second outer inclined surface 310B, inclination angle α2. .

In this case, the lifting nut 300 ′ is rotated while being elevated in the through hole 110 by being coupled with the head 210 of the fixing screw 200, and the fixing screw 200 is inserted in an oblique direction. In this case, the inclined seating surface 111 of the through hole 110 is fixed and pressed in the direction most closely contacted.

Accordingly, even when the fixing screw 200 is inserted in various inclined directions, the lifting nut 300 ′ is fixed in a direction in which an optimum contact surface with the inclined seating surface 111 of the through hole 110 is formed. It has the effect of exhibiting a stable pressurization force.

Of course, in this case, the guide protrusion and the outer guide groove for restricting the rotation of the lifting nut 300 ′ are not formed.

The rights of the present invention are not limited to the embodiments described above, but are defined by what is described in the claims, and that a person having ordinary knowledge in the field of the present invention can make various modifications and adaptations within the scope of the rights described in the claims. It is self-explanatory.

The present invention relates to a bone fixing device that can be fixed by changing the direction of the bone insertion axis of the fixing screw according to the surgical site and situation. In the present invention, the bone fixing screw can be fixed in various directions according to the shape of the bone to be fixed. A fixing mechanism is provided, but the head of the fixing screw is fixed to the plate through hole by the lifting of the lifting nut, so that the fixing screw head can be stably fixed in the plate through hole regardless of the axial direction.

100: plate 110: through hole
111: inclined seating surface 113: guide protrusion
200: fixing screw 210: head
211: fixing thread 220: body
221: main thread 300, 300': lifting nut
310: outer slope 320: inner thread
330: outer guide groove 400: fixing clip
410: incision

Claims (7)

A plate in close contact with the bone to be fixed and in which one or more through holes are formed;
A lifting nut having an outer periphery formed as an inclined surface and inserted into the through hole, and elevating and descending along the inside of the through hole;
A fixing clip having an incision formed on one side and being inserted under the through hole to prevent the lifting nut from being separated from the through hole; And
Through the through hole, comprising a fixing screw inserted and fixed to the bone through screwing:
The through hole,
The inner side is formed as an inclined seating surface having an inclined diameter narrowing from the bone junction surface to the other side of the plate:
The outer inclined surface of the lifting nut,
A bone fixing mechanism capable of multi-axis coupling, characterized in that the inclination angle is configured to change linearly so that even when the fixing screws are inserted in different directions, they are in close contact with the inclined seating surface of the through hole.
The method of claim 1,
The fixing screw,
A body portion having a main screw thread inserted into the bone;
It is configured to include a head having a fixing screw thread for screwing with the lifting nut inserted into the through hole is formed:
On the inner circumferential surface of the lifting nut,
A bone fixing mechanism capable of multi-axial coupling, characterized in that an inner thread corresponding to the fixing screw is formed.
delete The method of claim 2,
The lifting nut,
A bone fixing mechanism capable of multi-axis coupling, characterized in that the outer periphery is formed to have a size larger than an upper diameter of the through hole and smaller than a lower diameter of the through hole.
The method of claim 4,
On the inclined seating surface,
A guide protrusion protruding into the through hole is formed;
On the outer circumferential surface of the lifting nut,
An outer guide groove into which the guide protrusion is inserted is formed;
A bone fixing mechanism capable of multi-axis coupling, characterized in that the relative rotation with respect to the penetration is constrained when the lifting nut is raised or lowered.
The method of claim 5,
At the bottom end of the through hole,
A multi-axially-coupleable bone fixation mechanism, characterized in that a protruding jaw is formed to restrain the detachment of the inserted fixation clip.
The method of claim 5,
The through hole,
A bone fixation mechanism capable of multi-axis coupling, characterized in that a plurality of different sizes are formed on the plate at different positions.

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