KR101209296B1 - Bone distractor - Google Patents

Abstract

PURPOSE: A bone distracter is provided to regenerate a bone piece by gradually moving a small healthy bone piece to a wide bone loss part. CONSTITUTION: A post(120) is formed with a planar shape and is arranged in the same direction as a vertical direction of a shaft(110). The post is screwed to a first thread(110A) and a second thread(110B) by a combination unit(121). A first extension unit(130) and a second extension unit(132) are hinged with the post. An angle control unit(140) controls the first extension unit and the second extension unit to correspond to the curved parts of a first bone and a second bone. The angle control unit includes a position combining hole(142), a plurality of angle control holes(144), and a fixing pin(146).

Description

Bone elongation {BONE DISTRACTOR}

The present invention relates to a bone expander, and more particularly, to correct a malformation or to regenerate an accidentally lost bone tissue on the curved portion of the human bone tissue, by gradually moving a small amount of healthy bone fragments in a wide range of bone defects It relates to a bone expander that can allow bone regeneration of bone fragments.

In general, various surgical procedures such as magnetic bone grafts or artificial bone grafts have been applied to treat a widespread defect in the skull and a wide defect in the facial bone after extensive trauma including cranial and facial fractures and bone defects. .

However, magnetic bone graft requires additional surgery away from the defect to use the bones such as the hips, and there is a problem that additional infection and additional complications of the bone donor site may occur during this process. Transplantation of animal bones is difficult to completely rule out the side effects caused by the genetic differences between the bones provided and the patients undergoing the procedure, the bone strength decreases after successful transplantation, fibrosis and chronic infection of surrounding tissues There were problems that could arise with this addition.

Bone nephrectomy, which is recently introduced, is a treatment technique that can overcome the above problems. The bone fragments at both ends are gradually moved away from each other by the bone expander to form kidney bones or healthy bone fragments in bone defects without bone tissue. It is to gradually move to form a new bone between the moving and fixed bone fragments.

Here, the bone elongation separates the bone fragments to be moved first, and then when the traction is applied to the healing callus (Healing Callus) that combines the separated bone fragments, the extension of the bone tissue starts, and artificial traction is applied to the bone tissue During this period, new bone tissue is formed in the kidney area along with bone regeneration, which is accompanied by regeneration of new bone. Various tissues, including active tissue formation and elongation corresponding to the tensile direction, also occur.

Such bone nephrectomy began to be applied mainly to the limbs that induce new bone formation, and now it is extended to the skull and facial area, and in the case of craniofacial face (head and jaw-face) in 1992, McCarthy ( Since McCarthy's first extension of the mandible (mandibular jaw) using human extraoral devices, many clinicians have been applying bone reconstruction to reconstruct congenital, developmental malformations or other facial defects in the cranial face. .

However, when congenital, developmental malformations and defects occur in areas having different curved structures, such as the skull, cranial facial part, and mandibular bone, bone elongators composed of conventional straight lines are provided to provide a strong tensile force on the missing curved bone. There is a problem that it is difficult to apply.

In particular, the above-mentioned treatment method enables the treatment by increasing the length or volume of the jaw-facial deformity deformity bone, but if the bone defect is extensively lower without treating the bone defect after trauma or malignancy, the missing bone is a complex curved surface. Unless autologous bone graft is performed, restrictive treatment methods such as implantation of suitable curved metals and implantation into the defects are inevitably carried out, and bone tissues having curved structures such as facial or skull When regeneration is required and when the portion has a curved moving surface corresponding to a different curved structure, there is a problem that it is difficult to reconstruct bone tissue using a conventional bone expander.

Technical problem of the present invention, to correct the malformation or to recover the bone tissue accidentally lost to the curved portion of the human bone tissue, it is possible to regenerate the bone fragments by gradually moving a small amount of healthy bone fragments in a wide range of bone defects To provide a bone expander.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

The technical problem, according to the present invention, the first threaded and the second threaded shaft is formed at both ends; A post coupled to each of the first thread and the second thread so as to adjust the separation distance according to the rotation of the shaft; And a first extension part which is formed so that the coupling grooves opened in one direction are opposed to each other so as to be fixed to the first bone and the second bone, which are curved on both sides of the bone defect part, so as to be relatively hinged with respect to the post. It is achieved by a bone expander, characterized in that it comprises a second kidney.

The post has a coupling groove recessed from the surface at a lower end thereof, and the first extension portion and the second extension portion protrude from the surface on the upper surface so as to be hinged relative to the post to mediate the hinge to the coupling groove. It may include a semi-circular coupling portion coupled to.

An angle adjusting unit for adjusting the opening of the fastening groove at an angle corresponding to the curved surface of the first bone and the second bone in accordance with the hinge movement of the first extension and the second extension, the angle adjustment unit Positioning hole formed to penetrate the coupling groove adjacent to the hinge on the surface of the post; A plurality of angle adjusting holes formed to be spaced apart from each other along a circular arc with concentric circles so as to coincide with the positioning holes on the surface of the coupling part to adjust the angle of the fastening groove; And inserted into the positioning hole and the angle adjusting hole so as to fix the first extension part and the extension part adjusted to an angle corresponding to the curved surfaces of the first bone and the second bone by hinged motion with respect to the post. It may include a fixing pin to be coupled.

An angle adjusting unit for adjusting the opening of the fastening groove at an angle corresponding to the curved surface of the first bone and the second bone in accordance with the hinge movement of the first extension and the second extension, the angle adjustment unit A plurality of engaging grooves are formed spaced apart from each other by a predetermined interval around the coupling portion; And a shape that corresponds to the locking groove and protrudes in the direction of the locking groove so as to be elastically supported in the post to fix the angle of the first extension portion and the second extension portion hinged with respect to the post. It may include a locking portion having a locking projection.

The post has an accommodating groove which is opened in the locking groove direction to accommodate the locking portion, and the receiving groove has an elastic portion coupled therein to elastically support the locking portion in the locking groove direction. Can be.

The receiving groove, the guide portion is formed to guide the projection of the locking projections; And an expansion part provided to accommodate the elastic part elastically supporting the locking part inwardly of the guide part.

The locking portion may include a stopper protruding to a surface along a circumference so as to allow only the protrusion as long as the locking protrusion is inserted into the locking groove and locked.

Around the inlet of the locking groove, a curved surface portion is formed so that the locking projection can naturally ride when the external force acts on the first extension portion and the second extension portion.

The present invention, the first extension portion is provided to be adjusted to the distance between each other is moved in the longitudinal direction of the shaft after being adjusted at an angle corresponding to the curved surface of the first bone and the second bone by a relative hinged movement relative to the post and By providing a bone expander having a second kidney, the bone fragment may be easily regenerated by gradually moving a small amount of healthy bone fragments to a wide range of bone defects while being easily applied to a curved bone defect such as a facial part or a skull of a human bone tissue. Can be.

1 is a perspective view of a bone expander according to an embodiment of the present invention.
2 is a front view of the bone expander of FIG. 1.
3 is a cross-sectional view of the bone expander of FIG. 1.
4 is a cross-sectional view illustrating a state in which the first bone and the second bone are inserted into and fixed to the first and second kidneys as an operating state of the bone expander of FIG. 1.
5 is a cross-sectional view illustrating a state in which the first bone and the second bone are inserted into the first kidney and the second kidney as an operating state diagram of the bone expander of FIG. 1.
6 is a perspective view of a bone expander according to another embodiment of the present invention.
7 is a cross-sectional view of the bone expander of FIG. 6.
8 is an enlarged view of a portion 'A' of FIG. 7.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

1 is a perspective view of a bone expander according to an embodiment of the present invention, Figure 2 is a front view of the bone expander of Figure 1, Figure 3 is a cross-sectional view of the bone expander of Figure 1, Figure 4 of the bone expander of Figure 1 Fig. 5 is a cross-sectional view showing a state in which the first bone and the second bone are inserted into and fixed to the first extension part and the second extension part as an operating state, and FIG. 5 is an operating state diagram of the bone expander of FIG. 1. It is sectional drawing which shows the state in which the 1st bone and the 2nd bone were inserted in the extension part.

Work Example

The bone expander 100 according to an embodiment of the present invention, as shown in Figures 1 to 3, the shaft 110, the post is coupled to each other so as to control the mutual separation distance at both ends of the shaft 110 120, a first extension part 130 and a second extension part 132 coupled to the post 120 in a relative hinged motion, and a first extension part 130 and a second extension part 132. It includes an angle adjusting unit 140 for adjusting the angle corresponding to the curved surface of the first bone (S1) and the second bone (S2) is provided on both sides of the bone defect (S).

The shaft 110 is formed in a fixed length and is provided with a first thread 110A and a second thread 110B at both ends.

That is, the first thread 110A and the second thread 110B are formed to correspond to both ends with respect to the longitudinal center of the shaft 110.

Here, the first thread 110A is formed of a right screw and the second thread 110B is formed of a left screw. At this time, the position of the right hand thread formed in the first thread 110A and the left hand thread formed in the second thread 110B may be formed in a mutually changing structure.

That is, the first thread 110A may be formed of a left screw and the second thread 110B may be formed of a right screw.

Post 120 is formed in a plate shape is arranged in the same direction as the longitudinal direction of the shaft 110 is a configuration that the coupling groove 122 is provided. The upper end of the post 120 is provided with a coupling hole 121 penetrated in the transverse direction with respect to the longitudinal direction of the shaft 110 to be inserted into the shaft 110, the first thread (110A) and the second thread ( 110B) are combined to be spaced apart from each other at regular intervals. At this time, a screw thread corresponding to the first screw thread 110A and the second screw thread 110B of the shaft 110 is formed in the coupling sphere 121 to perform a linear motion according to the rotation of the shaft 110. Accordingly, the post 120 can be adjusted to the mutual separation distance according to the rotation of the shaft 110.

The post 120 is screwed so as to be spaced apart from each other by a predetermined distance to the first thread (110A) and the second thread (110B) via the coupling sphere 121 to adjust the mutual separation distance in accordance with the rotation of the shaft (110). It will be a linear movement in the longitudinal direction of the shaft 110.

Coupling groove 122 is a configuration provided in the lower end of the post (120). That is, the coupling groove 122 is formed to be recessed from the surface of the lower end of the post 120, the semi-circular coupling portion 136 provided in the first extension portion 130 and the second extension portion 132 which will be described later is inserted It is coupled to each other via the rear hinge 137.

The first extension part 130 and the second extension part 132 are formed to be fixed to the first bone S1 and the second bone S2 of the bone defect S, and thus, relative to the post 120. Each of the relative hinge movement is coupled to each other and the coupling groove 134 and the semicircular coupling portion 136 is provided. In this case, the first extension part 130 is fixed to the first bone S1 and the second extension part 132 is fixed to the second bone S2.

The fastening groove 134 is configured to be opened in one direction so as to be fixed to the first bone S1 and the second bone S2, and is mutually connected to the first extension part 130 and the second extension part 132. It is formed to face. That is, the fastening groove 134 provides a space that can be inserted into and fixed to the first bone S1 and the second bone S2. A screw (not shown in the drawing) is inserted into the upper end of the fastening groove 134 to form a plurality of screw holes 135 that can be fastened to the first bone S1 and the second bone S2. The first bone S1 and the second bone S2 are inserted into the fastening groove 134 and then inserted into the screw holes 135 to be fastened by the first extension part 130 and the second extension part 132. It can be firmly fixed to the.

Here, the first bone S1 and the second bone S2 of the present embodiment are inserted into the fastening groove 134 and fixed to the first extension part 130 and the second extension part 132 via screws. In another embodiment of the present invention, the first bone S1 and the second bone S2 are inserted into the fastening groove 134 and then screwed into the first extension part 130 and the second extension part 132. It may be provided to maintain the inserted state without being fixed. This is the first bone (S1) and the second bone (S2) inserted into the fastening groove 134 during the gap control and hinge movement of the first kidney 130 and the second kidney 132 according to the bone regeneration of bone defects ) To allow flow.

In addition, the fastening groove 134 is formed larger than the thickness of the first bone (S1) and the second bone (S2), so that the first bone (S1) and the second bone (S2) in the fastening groove (134) It can be easily inserted.

The coupling part 136 is configured to be capable of relative hinge movement of the first extension part 130 and the second extension part 132 with respect to the post 120. The first extension part 130 and the second extension part are provided. The upper surface of the portion 132 is formed to protrude in a semicircular shape from the surface. The coupling portion 136 is inserted into the coupling groove 122 provided in the post 120 and then coupled via the hinge 137, whereby the first extension portion 130 and the second extension portion 132 is The relative hinge movement with respect to the post 120 becomes possible.

The angle adjusting unit 140 is configured to adjust the first extension part 130 and the second extension part 132 at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2. The positioning hole 142 provided in the post 120, the plurality of angle adjusting holes 144 provided in the first extension part 130 and the second extension part 132, and the positioning hole 142 are provided. It includes a fixing pin 146 coupled to the angle adjusting hole 144 to be inserted into the) and then to secure the angle of the first extension portion 130 and the second extension portion 132.

The positioning hole 142 is configured to penetrate the coupling groove 122 on the surface of the post 120. That is, the positioning hole 142 is formed through the coupling groove 122 to be adjacent to the hinge 137 on the surface of the post 120.

The plurality of angle adjusting holes 144, the angle of the fastening groove 134 provided in the first extension portion 130 and the second extension portion 132, the curved surface of the first bone (S1) and the second bone (S2) It is configured to be adjusted to the angle corresponding to, and the hinge 137 on the surface of the coupling portion 136 is formed to penetrate at regular intervals spaced apart from each other along the arc in a concentric circle to match the positioning hole 142. That is, the angle adjusting hole 144 is formed on the surface of the coupling portion 136 to form a concentric circle with the positioning hole 142 around the hinge 137.

The fixing pin 146 may fix the first extension part 130 and the second extension part 132 hinged at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2. It is a structure provided. The fixing pin 146 is hinged relative to the post 120, the first extension portion 130 and the second extension is adjusted at an angle corresponding to the curved surface of the first bone (S1) and the second bone (S2) The part 132 is fixed at the corresponding angle.

That is, the fixing pin 146 is the first extension portion 130 and the second extension portion 132 relative hinged movement relative to the post 120, the positioning hole 142 and the angle adjustment hole 144 coincide with each other. Adjusted to an angle corresponding to the curved surface of the first bone (S1) and the second bone (S2) to be inserted into the positioning hole 142 is coupled to the angle adjusting hole 144, accordingly the first extension 130 ) And the second extension 132 are fixed at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2.

Such an angle adjusting unit 140, the first extension portion 130 and the second extension portion 132 relative to the hinge 120 relative to the post 120 of the first bone (S1) and the second bone (S2) By adjusting and fixing at an angle corresponding to the curved surface, the first extension part 130 and the second extension part 132 may be adjusted at various angles according to the curved surfaces of the first bone S1 and the second bone S2. Will be.

4 and 5 will be described the operation of the bone expander according to an embodiment of the present invention.

As shown in FIG. 4, in order to correct an anomaly for a curved portion of the bone tissue of the human body or to perform a bone elongation according to the regeneration of an accidentally lost bone tissue, the first kidney that has a relative hinge movement with respect to the post 120 is used. The part 130 and the second extension part 132 are adjusted at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2 of the bone defect S that requires bone tissue regeneration.

When the first extension 130 and the second extension 132 is hinged relative to the post 120 to be adjusted to an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2, the angle After matching the positioning hole 142 and the angle adjusting hole 144 provided in the adjusting unit 140, the fixing pin 146 is combined to fix at the corresponding angle, and accordingly the first bone (S1) and the second bone It is adjusted to the angle corresponding to the curved surface of (S2).

That is, the angle adjustment of the first extension part 130 and the second extension part 132 corresponds to the curved surfaces of the first bone S1 and the second bone S2 according to the relative hinge movement with respect to the post 120. Matching the positioning hole 142 and the angle adjusting hole 144 at an angle and then inserting the fixing pin 146 into the positioning hole 142 to be coupled to the angle adjusting hole 144 first bone (S1) And it is adjusted and fixed at an angle corresponding to the curved surface of the second bone (S2).

When the first extension portion 130 and the second extension portion 132 are adjusted and fixed at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2, the extension portion 132 is extended to the fastening groove 134. After inserting the first bone (S1) and the second bone (S2) is firmly fixed by a screw inserted into the screw hole (135).

When the first bone S1 and the second bone S2 are fixed to the coupling groove 134 of the first extension part 130 and the second extension part 132, the shaft 110 is rotated so that the first extension part is rotated. 130 and the second extension portion 132 to adjust the separation distance between each other.

That is, when the shaft 110 is rotated, the coupling sphere 121 provided in the post 120 is moved along the longitudinal direction of the shaft 110 and accordingly the first extension portion 130 coupled to the post 120 and The separation distance of the second extension part 132 is adjusted.

When the separation distance between the first extension portion 130 and the second extension portion 132 is adjusted, it is left for a predetermined time (4 days to 10 days), the maturation and union of the bones according to the rotation of the shaft 110 Repeat the process of extending the separation distance between the first extension 130 and the second extension 132 mutually extends the bone continuously. At this time, the length of extending the first bone S1 and the second bone S2 is 1 mm per day.

When the continuous stretching of the bone is completed, after the bone reinforcement period of 6 to 8 weeks to confirm the maturation and union between the new bone tissue and the existing bone tissue is confirmed by removing the bone elongation (100) and suture the incision site To conclude.

As shown in FIG. 5, the first bone S1 and the second bone S2 are inserted into the fastening grooves 134 provided in the first extension part 130 and the second extension part 132, and then inserted into the screw. It is provided not to be fixed by.

That is, the first bone (S1) and the second bone (S2) is inserted into the fastening groove 134, and is provided to maintain the inserted state without being fixed by a screw, so that the first kidney portion according to the bone regeneration of the bone defect It is possible to flow in the coupling groove 134 during the adjustment and the hinge movement of the 130 and the second extension portion 132.

As described above, the bone expander 100 according to the embodiment of the present invention may be hinged relative to the post 120 at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2. After being adjusted and moved along the longitudinal direction of the shaft, the first kidney 130 and the second kidney 132 provided to adjust the separation distance therebetween, a bone defect such as a facial part or skull of a human bone tissue While easily applied to (S), by gradually moving a small amount of healthy bone fragments to a wide range of bone defects (S) may be possible bone regeneration of the bone fragments.

Other Example

5 is a perspective view of a bone expander according to another embodiment of the present invention, Figure 6 is a cross-sectional view of the bone expander of Figure 5, Figure 7 is an enlarged view of the 'A' portion of FIG.

The bone expander 200 according to another embodiment of the present invention, as shown in Figures 5 to 7, the shaft 210 and the post is coupled to each other so as to control the mutual separation distance at both ends of the shaft 210 220, a first extension part 230 and a second extension part 232 coupled to the post 220 so as to be capable of relative hinge movement, and a first extension part 230 and a second extension part 232. It includes an angle adjusting unit 240 for adjusting the angle corresponding to the curved surface of the first bone (S1) and the second bone (S2) provided in the bone defect (S).

Here, the shaft 210, the post 220, the first extension part 230, and the second extension part 232 have the same configuration and function as those described above in one embodiment of the present invention, and thus will be described in detail below. Will be omitted, and in this embodiment, only the structure and the angle adjusting unit 240 of the post 220 having a structure different from that of one embodiment will be described in detail.

The post 220 is formed to allow hinge movement of the first extension part 230 and the second extension part 232, and has a receiving groove 224 therein.

That is, the first extension part 230 and the second extension part 232 are inserted into the coupling groove 222 provided in the post 220 and then coupled via the hinge 237, and thus, relative to the post 230. Hinge movement is possible.

The accommodation groove 224 has a configuration in which a guide part 224A and an extension part 224B are provided to accommodate the locking part 244 described later and protrude in the direction of the locking groove 242.

That is, the receiving groove 224 is a guide portion 224A for guiding the protrusion of the locking protrusion 246 provided in the locking portion 244 and an elastic portion for elastically supporting the locking portion 244 inward of the guide portion 224A. Opening in the direction of the locking groove 242 is formed in the interior of the post 220 so that the expansion portion 224B for accommodating 226 is provided.

The elastic part 226 is configured to elastically support the locking part 244 in the direction of the locking groove 242 after being accommodated in the accommodation groove 224 and is formed of a known spring.

The angle adjusting unit 240 corresponds to the curved surface of the first bone S1 and the second bone S2 provided with the first extension 230 and the second extension 232 at the bone defect S. In the configuration provided to be adjusted at an angle, a plurality of engaging grooves 242 provided in the coupling portion 236, and the first extension portion 230 and the second extension portion (h) relative hinged relative to the post 220 And a catching part 244 provided in the post 220 to fix the angle of 232.

The plurality of locking grooves 242 is configured to be provided along an arc surface around the coupling portion 236. That is, the engaging groove 242 is formed recessed in a hemispherical shape from the surface so as to be spaced apart from each other along a circular arc around the coupling portion 236 and the first extension portion 230 and the second extension portion 232 is Relative hinge movement with respect to the post 220 is adjusted to various angles corresponding to the curved surface of the first bone (S1) and the second bone (S2) to be caught by the locking portion 244 described later. Around the inlet of the locking groove 242 is formed to be curved so that the locking projections 246 provided on the locking portion 244 when the external force acts on the first extension portion 230 and the second extension portion 232 to naturally ride over. The curved portion 242A is provided so that it can be easily moved to the other engaging groove 242 when the angle of the first extension portion 230 and the second extension portion 232 is adjusted.

The catching part 244 includes a first extension part 230 and a second extension adjusted to an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2 by a relative hinge movement with respect to the post 220. The part 232 is configured to be fixed at a corresponding angle.

That is, the locking portion 244 is elastically supported by the elastic portion 226 inside the post 220 to secure the first extension 230 and the second extension 232 at the corresponding angle, the locking groove 242 It is received so as to protrude in the direction and the locking projection 246 of the shape corresponding to the locking groove 242 is formed in the front end portion.

The locking portion 244 is accommodated to be prevented from being separated in the direction of the locking groove 242 in the expansion portion 224B of the receiving groove 224 and the guide portion so that only the locking projection 246 can be caught in the locking groove 242 ( 224A).

That is, the locking portion 244 is formed with a stopper 244A protruding from the surface along the circumference so as to be locked to the expansion portion 224B, and thus the first extension portion 230 and the second extension portion 232. While preventing the deviation from the receiving groove 224 toward the locking groove 242 by the elastic force provided from the elastic portion 226 when adjusting the angle of the locking projection 246 may be inserted into the locking groove 242 can be caught. Only allow a degree of protrusion.

The locking part 244 corresponds to the curved surface of the first bone S1 and the second bone S2 by the first extension part 230 and the second extension part 232 relative to the post 220. The locking projection 246 is inserted into the locking groove 242 by the elastic force provided from the elastic portion 226 after being adjusted at an angle to be locked. Accordingly, the first extension part 230 and the second extension part 232 may be adjusted and fixed at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2.

In addition, when the angles of the first extension part 230 and the second extension part 232 are adjusted again, the locking protrusion 246 is locked to the first extension part 230 and the first extension part while being caught by the locking groove 242. 2 by the external force acting as the extension portion 232 and the elasticity supporting the locking portion 244 to be easily moved to another locking groove 242 riding the curved portion 242A provided around the inlet of the locking groove 242 do.

As described above, the bone expander 200 according to another embodiment of the present invention has a relative hinge movement with respect to the post 220 at an angle corresponding to the curved surfaces of the first bone S1 and the second bone S2. The first extension part 230 is provided by the locking groove 242 and the locking part 244 by means of the angle adjusting part 240 for fixing the adjusted first extension part 230 and the second extension part 232. And it is to improve the convenience according to the angle adjustment of the second extension portion 232, except for this action and effect is the same as the embodiment of the present invention described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Therefore, such modifications or variations are not to be understood individually from the technical spirit or point of view of the present invention, the modified embodiments will belong to the claims of the present invention.

110: shaft 120: post
122: coupling groove 130: first extension portion
132: second extension portion 134: fastening groove
136: coupling portion 140: angle adjustment unit
142: positioning hole 144: angle adjustment hole
146: push pin

Claims (8)

A shaft having first and second threads formed at both ends thereof;
A post coupled to each of the first thread and the second thread so as to adjust the separation distance according to the rotation of the shaft; And
A first extension part and a first extension part which are formed to be opposite to each other so that the fastening grooves open in one direction to be fixed to the first bone and the second bone which are curved on both sides of the bone defect part are mutually hinged relative to the post; Bone stretcher, characterized in that it comprises two kidneys. The method of claim 1,
In the post,
A coupling groove recessed from the surface is formed at the lower end,
The first extension portion and the second extension portion,
And a semi-circular coupling portion protruding from the surface on the upper surface so as to be hinged relative to the post and coupled to the coupling groove via a hinge. The method of claim 2,
An angle adjusting unit for adjusting the opening of the fastening groove at an angle corresponding to the curved surface of the first bone and the second bone in accordance with the hinge movement of the first extension and the second extension,
Wherein the angle-
A positioning hole formed on the surface of the post to penetrate the coupling groove adjacent to the hinge;
A plurality of angle adjusting holes formed to be spaced apart from each other along a circular arc with concentric circles so as to coincide with the positioning holes on the surface of the coupling part to adjust the angle of the fastening groove; And
Inserted into the positioning hole and the angle adjusting hole so as to fix the first extension portion and the extension portion adjusted to an angle corresponding to the curved surfaces of the first bone and the second bone by hinge movement with respect to the post. Bone stretcher characterized in that it comprises a fixing pin. The method of claim 2,
An angle adjusting unit for adjusting the opening of the fastening groove at an angle corresponding to the curved surface of the first bone and the second bone in accordance with the hinge movement of the first extension and the second extension,
Wherein the angle-
A plurality of locking grooves arranged around the coupling portion at regular intervals and recessed from a surface thereof; And
An obstacle of a shape corresponding to the locking groove and protruding in the direction of the locking groove is received so as to be elastically supported in the post to fix the angle of the first extension portion and the second extension portion hinged relative to the post. Bone stretcher comprising a locking portion having a group. 5. The method of claim 4,
In the post,
An accommodation groove is formed to be opened in the direction of the locking groove to accommodate the locking portion,
The receiving groove,
And an elastic portion coupled therein to elastically support the locking portion in the locking groove direction. The method of claim 5,
The receiving groove,
A guide part formed to guide the protrusion of the locking protrusion; And
And an expansion part provided to receive the elastic part elastically supporting the locking part inwardly of the guide part. The method of claim 5,
[0027]
And a stopper protruding to the surface along a circumference so as to allow only the protrusion of the locking protrusion to be locked by being inserted into the locking groove. 5. The method of claim 4,
Around the entrance of the locking groove,
Bone elongator, characterized in that the curved surface portion is formed so that the engaging protrusion is naturally riding over when the external force is applied to the first extension portion and the second extension portion.

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