KR100253434B1 - Bridging bone plate - Google Patents

Abstract

PURPOSE: A plate for fixing bone and a guide device for attaching the plate are provided, to reduce the pressure put on the bone tissue and to allow a small size of bone tissue to be transplanted without the pressure. CONSTITUTION: The plate for fixing bone is such that it comprises a body and a plurality of penetrating holes(25) formed in the body at regular intervals; the interval of the penetrating holes at the bone-fixing part is wider than that at the bone-attached part; an auxiliary penetrating hole(26) whose diameter is smaller than that of the penetrating holes is formed at the joint parts between the penetrating holes formed at the bone-fixing part; and the screw is formed at the inner circumference of the penetrating holes and the auxiliary penetrating hole. The guide device comprises a main axis; an outer guide plate where a guide hole is formed in the center; an inner guide plate which is fixed to the main axis and contains a projected position setting ring; and an interval control device which changes the interval between the outer guide plate and the inner guide plate.

Description

Bone fixation plate and guide device for attaching it

The present invention relates to a bone fixing plate and a guide device for attaching the same, and more particularly, to maintain the remaining jaw bone in a desired form after removing a portion of the lower jaw bone or by removing a portion of the jaw bone caused by oral cancer surgery. It relates to a bone fixing plate for and a guide device for attaching it.

The bone fixation plate is used to remove or cut a part of the jaw bone by performing oral cancer surgery, or to find the abnormality in the bone to remove the area and to maintain the shape of the remaining part or to implant and fix a new bone. It is an aid.

Referring to Figure 1, conventionally showing a method for fixing a portion of the bone removed using a bone fixing plate.

Hereinafter, the case of applying the bone fixing plate to the mandible of the face for convenience of description will be described as an example.

As shown, the bone fixing plate 20 is mounted on the front of the mandible 10 in a state in which a part 15 of the mandible 10 is removed. The bone fixing plate 20 is a chain-shaped plate in which the through holes 25 are formed at a predetermined interval in the body 21 made of titanium, and a portion in which the through holes 25 are formed has a slightly wider width and has a through hole ( 25) the portion is not formed to form a narrower width to reduce the overall volume to reduce the volume added to the mandible (10).

In addition, the through holes 25 formed at both ends in direct contact with the mandible 10 and the through holes 25 formed corresponding to the portion 15 from which the mandible 10 is removed are formed at different intervals. That is, at both ends of the body 21, the bone fixing plate 20 must be securely fixed to the mandible 10 so that adjacent through holes are formed at a narrower interval.

Referring to FIG. 2, the screw 30 is inserted into the through holes 25 at both ends to be embedded in the lower jaw 10 so that the bone fixing plate 20 is firmly attached to the lower jaw 10. ) To prevent flow.

On the other hand, when a new bone is implanted in the portion 15 from which the mandible 10 has been removed, as shown in FIG. 1, a new bone 12 is inserted from the inside of the mandible 10 and the bone corresponding to this portion. The new bone 12 is fixed by inserting the screw 30 in the through hole 25 formed in the body 21 of the fixing plate 20.

However, there are some problems in the method of attaching the bone fixing plate of this structure to the outside of the bone and fixed with a screw from the outside.

First, since the new bone is fixed from the outside, the transplanted tissue with blood circulation to be implanted is under pressure, and thus, the transplanted tissue is likely to be necrotic.

Second, there is a problem that the workability is poor because the bone for implantation is inserted from the inside and the screw is inserted into the through hole formed in the bone fixing plate from the outside.

Third, because of the large distance between the through-holes of the bone removed portion is difficult to fix when the bone is small, there is a problem that the bone itself is subjected to a large pressure.

Fourth, it is impossible to solve the above problems because the existing bone fixing plate is manufactured in a form that can not be mounted inside the bone.

It is therefore an object of the present invention to provide a bone fixation plate which is simple for transplanting bone and reduces the possibility of necrosis of the bone to be implanted without being compressed.

Another object of the present invention to provide a guide device for simply fixing the bone using the bone fixing plate described above.

1 is a perspective view showing a method for installing a conventional bone fixing plate,

Figure 2 is a cross-sectional view showing a state in which the bone fixing plate attached to the bone tissue in Figure 1,

3 is a perspective view of a plate for fixing bones according to an embodiment of the present invention,

Figure 4 is a perspective view showing a method for attaching and fixing a bone fixing plate according to an embodiment of the present invention,

5 is a perspective view showing a guide device according to an embodiment of the present invention,

6 is a cross-sectional view showing a method of attaching and fixing a bone fixing plate using a guide device according to an embodiment of the present invention,

7 is a perspective view illustrating a state in which a bone fixing plate is attached and fixed using a mesh;

8 is a plan view showing a modification of the bone fixing plate according to the present invention,

Figure 9a is a perspective view of a bone fixing plate according to another embodiment of the present invention,

9B is a cross-sectional view showing a method of attaching and fixing a bone fixing plate using a guide device according to another embodiment of the present invention.

According to one aspect of the invention, the plurality of through-holes formed at a predetermined interval in the body is formed at a first interval in the portion of the body to be attached to the bone and a second interval wider than the first interval in the portion of the body to which the implant bone is fixed Is formed in, the connection between the through-holes formed at the second interval is formed through the secondary through hole having a smaller diameter than the through hole, the bone fixing plate, characterized in that the screw is formed on the inner circumferential surface of the through hole and the secondary through hole Is initiated.

Preferably, a guide ring of a predetermined height is formed at one peripheral edge of the through hole and the auxiliary through hole.

In addition, the portion of the body attached to the bone can be bent at a predetermined angle.

Preferably, three to four through holes are formed in the portion of the body attached to the bone.

In addition, at least two auxiliary through holes are preferably formed.

Optionally, the material of the body may be a nonabsorbable material, preferably titanium or stainless steel, insertable into the human body or may be a bioabsorbable material, preferably a polymer or animal bone or a homologous human bone.

According to another aspect of the invention, between the main shaft, the outer guide plate formed with a guide hole in the center, the inner guide plate fixed to the main shaft and the positioning ring protruding on the side opposite to the outer guide plate, and the outer and inner guide plate The guide device is made of a gap adjusting device for changing the interval of the outer guide plate is opposed to the inner guide plate through the gap adjusting device is disclosed.

Preferably, the inner diameter of the positioning ring is the same as the outer diameter of the guide ring of the bone fixing plate.

Also preferably, the diameter of the guide hole is formed larger than the diameter of the through hole of the bone fixing plate.

On the other hand, the gap adjusting device is composed of a connecting ring, a fixing nut fixed to the connecting ring, a rotating nut rotatably connected to the connecting ring, the fixing nut is fixedly coupled to the inner guide plate side, the rotating nut is the outer guide plate It is rotatably coupled to the side.

According to another aspect of the invention, the main shaft, the outer guide plate formed with a guide hole in the center and the outer wall is tapered positioning to be inserted into the taper on the side fixed to the main shaft and opposite the outer guide plate A guide device, characterized in that the ring is formed with an inner guide plate protruding, and a gap adjusting device for changing the gap between the outer guide plate and the inner guide plate, the outer guide plate is opposed to the inner guide plate through the gap adjusting device. Is disclosed.

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

Figure 3 is a perspective view showing a bone fixing plate according to the present invention.

As shown, the bone fixation plate 20 is formed of a non-absorbent material or bioabsorbable material (eg, polymer or animal bone or allogeneic bone) such as titanium or stainless steel. The through holes 25 formed at both ends of the plate 20 body 21 are formed at narrower intervals with respect to the through holes 25 formed corresponding to the portion where the bone is implanted, and preferably three to four tablets. Is also formed.

In addition, the portion in which the through-hole 25 is formed has a slightly wider width, and the portion in which the through-hole 25 is not formed has a slightly narrower width to reduce the weight and volume as a whole.

According to the present invention, an auxiliary through hole 26 is formed in the connection portion 27 between the through holes 25 formed corresponding to the portion where the bone is implanted. In addition, a screw 8 is formed on the inner circumferential surfaces of the through holes 25 and the auxiliary through holes 26. Preferably, the diameter of the through hole 25 is 3.5 mm, and the diameter of the auxiliary through hole 260 is 2.0 mm or 2.4 mm. In addition, a guide ring 24 is formed at one peripheral edge of the through hole 25 and the auxiliary through hole 26. ) Is formed.

Referring to FIG. 4, in order to fix the mandible 10 using the bone fixing plate 20 of the present invention configured as described above, the bone fixing plate 20 is brought into contact with the inside of the mandible 10, and then the outside thereof. From the screw 30 is inserted into the mandible 10. At this time, the plate 20 is positioned so that the guide ring 24 faces the inside of the mandible 10. Accordingly, the screw 30 penetrates through the mandible 10 and is inserted into the through hole 25 of the bone fixing plate 20 located at the rear side, and is coupled to the screw 28 formed on the inner circumferential surface of the through hole 25. In this way, the mandrel 10 separated by screwing the screw 30 into each of the through holes 25 formed at both ends is completely fixed.

On the other hand, when a new bone is implanted in the portion 15 from which the bone has been removed, the implanted bone 12 is inserted into the portion 15 from the outside and the screw 30 is inserted into the mandible 10 from the outside. When the size of the implanted bone 12 is small, it is fixed using the auxiliary through-hole 26. That is, instead of the large diameter screw 30 corresponding to the through hole 25, a small diameter screw is used to screw the auxiliary through hole 26. Accordingly, it is possible to reduce the pressure applied to the small sized bone graft 12 and to prevent the bone from being broken by a large diameter screw.

Referring to FIG. 7, when the implanted bone 12 is small, the mesh 40 may be additionally used after fixing the respective bones 12 using the auxiliary through holes 26. That is, the titanium mesh 40 is placed on the graft bone 12 and then screwed into the through hole 25 or the auxiliary through hole 26 using the screw 30. Therefore, there is an advantage of being more securely fixed because it brings the effect of integrating and fixing the small graft bones 12 which are separated and fixed respectively. In addition, when implanting into very small bone fragments, the mesh 40 is fixed to the bone fixation plate 20 by using the through hole 25 or the auxiliary through hole 26, and the bone pieces are inserted into the mesh 40 to be transplanted. can do.

Meanwhile, the bone fixing plate 20 and the screw 30 may be formed by processing a bioabsorbable material (for example, a polymer, an animal bone, or a human allogeneic bone). In this case, since the bone fixing plate 20 is dissolved and absorbed and the screw 30 is naturally implanted in the bone, there is an advantage that it is not necessary to remove the bone fixing plate 20 again after attaching it.

When the bone fixing plate is attached to the inside as described above, since the screw is inserted from the outside to the inside, it is not easy to set the position corresponding to the through hole or the auxiliary through hole substantially accurately. Therefore, a guide device for this purpose is used, Figure 5 is a perspective view showing a guide device according to the present invention.

As shown, a handle 54 is formed at one end of the main shaft 51 and the inner guide plate 57 and the outer guide plate 56 are separated and connected to each other at predetermined intervals. The inner guide plate 57 is fixed to the main shaft 51 and the outer guide plate 56 is movably connected via the gap adjusting device 55.

The inner guide plate 57 is, for example, rectangularly positioned with a positioning ring 52 protruding in the center of the side opposite to the outer guide plate 56 and a through hole 59 formed therein. The inner diameter of the positioning ring 52 is the same as the outer diameter of the guide ring 24 formed at the periphery of the through hole 25 of the bone fixing plate.

In the center of the outer guide plate 56 is formed a guide hole 56a in which the positioning ring 52 of the inner guide plate 57 and the center coincide with each other, and the diameter of the guide hole 56a is a through hole 25. It is formed larger than the diameter of). Therefore, as will be described later, when the screw is screwed, since the diameter of the screw is the same as the diameter of the through hole 25, the entire screw can be inserted into the guide hole 56a. In addition, in the case where the diameter of the screw head is larger than the screw body, the diameter of the guide hole 56a may be set in consideration of this.

In addition, the gap adjusting device 55 is composed of a connection ring 55b, a fixing nut 55c fixed to the connection ring 55b, and a rotation nut 55a rotatably connected to the connection ring 55b. The fixing nut 55c is screwed to the main shaft 51 on the inner guide plate 57 side, and the rotating nut 55a is screwed to the connecting shaft 58 on the outer guide plate 56 side. At this time, since the rotating nut 55a is rotatable about the connecting ring 55b, the rotating shaft 55a can push or pull the connecting shaft 58 according to the rotation of the rotating nut 55a. The gap between the plates 56 is adjusted.

Hereinafter, a method of attaching the bone fixing plate 20 to the mandible 10 using the guide device of the present invention will be described with reference to FIG. 6.

First, the gap between the inner guide plate 57 and the outer guide plate 56 is adjusted to be greater than the width of the lower jaw 10 by releasing the rotation nut 55a of the gap adjusting device 55.

After the side without the guide ring 24 is formed to face the inner side of the mandible 10, any one of the guide ring 24 formed in the periphery of the through hole 25 of the bone fixing plate 20 It is inserted into the positioning ring 52 formed on the inner guide plate 57. At this time, since the inner diameter of the positioning ring 52 is the same as the outer diameter of the guide ring 24, the guide ring 24 maintains the state fitted to the positioning ring 52.

Next, hold the handle 54 with one hand so that the bone fixing plate 20 is properly positioned inside the mandible 10, and then tighten the rotary nut 55a to make the outer guide plate 56 the mandible 56 Make contact with the outside of the Accordingly, the inner guide plate 57 and the outer guide plate 56 are firmly tightened with the mandible 10 and the bone fixing plate 20 in contact therebetween.

Subsequently, after drilling to penetrate the lower jaw 10 from the guide hole 56a of the outer guide plate 56, tapping is performed to form a screw hole 58. Of course, in some cases, drilling is performed without tapping, and then the tip is inserted using a sharp screw.

The screw 30 is then inserted into the guide hole 56a and tightened with a predetermined driver. Accordingly, the screw 30 proceeds while engaging with the screw hole 58 formed in the mandible 10 and engages with the screw in the through hole 25 of the bone fixing plate 20 at the final end.

Then loosen the rotation nut (55a) to pull out the guide device.

As such, the screw 30 is inserted into one of the through holes 25 of the bone fixing plate 20 to temporarily fix the bone fixing plate 20 to the lower jaw 10. Then, the bone fixing plate can be completely fixed by fastening the screw to each of the through holes by the above method. The bone to be implanted can also be fixed using the same method as described above.

There are several advantages in attaching the bone fixation plate to the mandible by this method.

First, since the center of the guide hole 56a of the outer guide plate 56 and the through hole 25 of the bone fixing plate 20 coincide with each other, the screw 30 does not check the position of the through hole 25 one by one. Accurately fasten with the through hole 25 of the bone fixing plate 20, even if the operation is simplified.

Secondly, since the inner guide plate 57 of the guide device supports the bone fixing plate 20 itself, the pressure is not applied to the mandible 10 when the screw 30 is driven. Moreover, when the bone is transplanted, there is no fear of necrosis of the transplanted bone because no pressure is applied to the bone itself.

8A to 8C are plan views showing various modifications of the bone fixation plate according to the present invention. In this embodiment, only the mandible bones may be formed. That is, when the through-hole is formed at a narrow angle, the body part is bent at a predetermined angle, which is according to the curvature of the mandible, and is fixed to the central part, the body part or the mandible, including both side parts of the mandible bent at a predetermined angle. Can be used effectively.

9 is a perspective view showing a bone fixing plate and a guide device according to another embodiment of the present invention.

9A, a taper 29 is formed at one end of the through hole 25 and the auxiliary through hole 26. 9B, in the center of the side surface of the inner guide plate 57, the positioning ring 52 having the outer wall tapered with the taper angle of the taper 29 is formed so as to be inserted into the taper 29.

According to this embodiment, when the screw 30 is placed on the outside of the mandible, the taper 29 of the bone fixing plate 20 is in contact with the mandible. That is, in one embodiment, when the screw 30 is inserted into the bone fixing plate 20 on the outside of the mandible, the direction of the screw 28 formed in the through hole 25 and the auxiliary through hole 26 is maintained as it is. When attempting, because the protruding guide ring 24 is in contact with the mandible, a gap is formed between the bone fixing plate 20 and the mandible so that a desired effect cannot be obtained. However, in this embodiment, since the taper 29 is formed, no gap is formed. In other words, it has the advantage that the screw can be fitted to both the inner and outer sides of the mandible.

As described above, according to the present invention, through holes are formed in the body of the bone fixing plate at predetermined intervals, and additionally, auxiliary through holes are formed between the through holes corresponding to the portions to be implanted with new bone. And forming a screw between the auxiliary through holes to attach to the inside of the bone to be fixed and to insert the screw from the outside to engage with the malleable screw. This has the following advantages.

First, it is possible to reduce the pressure on the bone, and by using the auxiliary through-holes, there is an advantage that a small sized bone can be easily transplanted without being compressed.

Second, the screw can be easily fastened to the through hole of the bone fixing plate attached to the inside by using the guide device.

Third, when the soft tissue is transplanted from the outside to the site where the bone is excised by attaching the bone fixing plate to the inside of the bone, the space of the transplanted tissue is secured and the pressure is not applied to the tissue so that the blood flows well. This is advantageous for engraftment.

Although the present invention has been described using the mandible as an example, it can be applied to bones of other parts of the body. In addition, the diameter, number, or shape of the through hole and the auxiliary through hole can be modified in various ways depending on the characteristics of the portion to be attached. On the other hand, the case of attaching the bone fixing plate on the inside has been described, for example, it is also possible to attach on the outside, whereby a suitable deformation can be applied to the guide device.

In addition, the guide device has been described in the case of applying to the through-hole, but in the case of applying to the through-hole can be modified in consideration of the size of the auxiliary through-hole of course.

Such modifications are naturally within the scope of the present invention without departing from the spirit of the present invention.

Claims (18)

In the bone fixing plate consisting of a body and a plurality of through holes formed at a predetermined interval of the body, The through holes are formed at a first interval in a portion of the body attached to the bone and are formed at a second interval wider than the first interval at a portion fixing the graft bone, An auxiliary through hole having a diameter smaller than the through hole is formed in the connection portion between the through holes formed at the second intervals. The bone fixing plate, characterized in that the screw is formed on the inner circumferential surface of the through hole and the auxiliary through hole. The bone fixing plate according to claim 1, wherein a guide ring having a predetermined height is formed at one peripheral portion of the through hole and the auxiliary through hole. The bone fixing plate according to claim 1, wherein a taper is formed at one peripheral edge of the through hole and the auxiliary through hole. The bone fixing plate according to claim 1, wherein a part of the body attached to the bone is bent at a predetermined angle. The bone fixing plate according to claim 1, wherein three to four through holes are formed in a portion of the body attached to the bone. The bone fixing plate according to claim 1, wherein at least two auxiliary through holes are formed. The bone fixing plate according to claim 1, wherein the body material is a bioabsorbable material. 8. The bone fixation plate of claim 7, wherein the bioabsorbable material is a polymer. 8. The bone fixation plate of claim 7, wherein the bioabsorbable material is animal bone. 8. The bone fixation plate of claim 7, wherein the bioabsorbable material is allogeneic human bone. The bone fixing plate according to claim 1, wherein the material of the body is a non-absorbent material that can be inserted into the human body. 12. The bone fixation plate of claim 11, wherein the non-absorbent material is titanium. 12. The bone fixation plate of claim 11, wherein the non-absorbent material is stainless steel. In the guide device used to attach the bone fixing plate of claim 2 to a bone, Spindle; An outer guide plate having a guide hole formed in the center thereof; An inner guide plate fixed to the main shaft and protruding with a positioning ring on a side opposite to the outer guide plate; A gap adjusting device for changing a gap between the outer guide plate and the inner guide plate; The outer guide plate is opposed to the inner guide plate via the gap adjusting device. The guide device according to claim 14, wherein the inner diameter of the positioning ring is the same as the outer diameter of the guide ring of the bone fixing plate. The guide device according to claim 14, wherein the diameter of the guide hole is larger than the diameter of the through hole of the bone fixing plate. 15. The method of claim 14, wherein the gap adjusting device comprises a connection ring, a fixing nut fixed to the connection ring, a rotating nut rotatably connected to the connection ring; The fixing nut is fixedly coupled to the inner guide plate side, The rotating nut is a guide device, characterized in that rotatably coupled to the outer guide plate side. In the guide device used to attach the bone fixing plate of claim 3 to the bone, Spindle; An outer guide plate having a guide hole formed in the center thereof; An inner guide plate which is fixed to the main shaft and has a tapered positioning ring protruding from the tapered angle of the taper so that the outer wall is inserted into the taper on a side opposite to the outer guide plate; A gap adjusting device for changing a gap between the outer guide plate and the inner guide plate; The outer guide plate is opposed to the inner guide plate via the gap adjusting device.