KR102198270B1 - Implant for Restoring and Fixing Maxillofacial defects - Google Patents

Abstract

Provides implants for repairing facial bone defects. The implant for restoring a facial bone defect according to an embodiment of the present application includes a body in which one or more fastening grooves through which a screw passes, and one or more protrusions protruding from the body and disposed on a bone to be repaired, the body, It may include a frame made of one or more members formed in a portion of the body in contact with the cortical bone of the bone to be repaired, and a fusion portion of a mesh structure connecting one or more members of the frame to each other.

Description

Implant for Restoring and Fixing Maxillofacial Defects {Implant for Restoring and Fixing Maxillofacial Defects}

The present application relates to an implant for repairing and fixing a facial bone defect.

Maxillofacial refers to hard tissues such as upper, mandible, and teeth that make up the face, jaw, and oral cavity, or soft tissues such as lips, gums, and tongue, and oral organs around them.

In particular, in the case of loss of cheekbones such as bone loss due to trauma such as a traffic accident, side effects of plastic surgery such as cheekbone reduction surgery, and congenital anomalies such as hemifacial dwarfism, implants have been made to rebuild them.

As a plastic implant for reconstruction of the maxillofacial & cranial bone, a plate that provides an environment in which the initial bone can be fused as a short-term fixation before the cut bone fragment is fixed by the new bone, and A method of using a screw and a method of inserting various implants have been used.

However, there is a disadvantage in that the implant is reflected or touched through the thin skin after surgery due to the occurrence of a step with the existing tissue, and it is difficult to restore the complete appearance because the implant is manually processed in accordance with the patient's appearance at the surgery site. have. In addition, when an implant is implanted, when surgery is difficult due to residual bone tissue, excessive removal of the existing tissue occurs.

Korean Patent Document No. 10-1863956 (2018.06.29) Japanese Patent Document No. 2992535 (1997.07.08)

The present application is an implant capable of reconstructing defective bone tissue while maximizing the use of existing tissue, and an attempt to provide an implant for reconstruction that recovers its appearance without a step from the existing tissue after transplantation.

An embodiment of the present application for solving the above problems includes a body formed through at least one fastening groove through which a screw passes, and at least one protrusion protruding from the body and disposed on a bone to be repaired, the body , Facial bone defects including a frame made of one or more members formed in a portion of the body in contact with the cortical bone of the bone to be repaired and a mesh structure connecting one or more members of the frame to each other Provide restoration implants.

In one embodiment, the protrusion may be disposed on a defective portion of the facial bone including the cheekbone, temporal bone, and lower jaw bone.

In an embodiment, the body and the inner profile of the at least one protrusion may have a shape such that the body and the inner profile of the one or more protrusions are in close contact with the bone to be repaired or a piece of remaining bone located at a defect portion of the bone to be repaired.

In an embodiment, the profile of the body and the one or more protrusions may be determined based on a CT image of an object having the bone to be repaired.

In one embodiment, the at least one protrusion includes at least one protrusion frame protruding from the body for phase optimization, and at least one protrusion joining part of a mesh structure that fills the space inside the at least one protrusion frame, and the at least one protrusion Each of the fusion portions may have a height corresponding to a height of a corresponding projection frame.

In one embodiment, the one or more fastening grooves may be formed through the frame.

In one embodiment, the one or more fastening grooves may be further formed through only the fusion portion.

In one embodiment, one or more suture grooves through which the suture passes may be formed in the fusion portion of the one or more protrusions.

In one embodiment, the implant may be fixed by inserting a screw into the bone to be repaired through the one or more fastening grooves.

In one embodiment, the mesh spacing of the fusion part and the protrusion fusion part in the mesh may be 1.5 mm or less.

According to the present application, the fusion force between the implant and the bone to be repaired is improved, so that the implant to be implanted can be maintained at the insertion position without separating.

In addition, the area of the mesh structure where the growing bone penetrates is maximized, and the area of the frame is minimized to improve the fusion force between the implant and the bone to be repaired, and the shape does not change even when a load pressure is applied. .

In addition, since the implant has a shape that closely adheres to the bone to be repaired, the area in contact with the bone to be repaired can be maximized compared to the conventional implant for repairing a facial bone defect, thereby achieving a more rigid union.

In addition, it is possible to restore the appearance after transplantation without a step from the existing tissue.

In addition, it is fixed to the bone to be repaired through a screw, and at the same time, it is further fixed through the surrounding soft tissue and sutures to provide a more improved fixation force.

Various embodiments are possible. In the case of a simple defect, when a fragmented bone is located in the defect, or when the defect is an empty space due to the loss of the bone, it is possible to provide an implant applicable to various cases.

It is not simply to cover the defect, but by filling the defect through the configuration of the protrusion, it is possible to maintain it for a long time even after transplantation is performed.

In addition, the implant of the present application is designed through phase optimization, so that the cost required for manufacturing the implant is minimized and its performance can be further improved.

1 is a view for explaining a portion to which an implant for repairing a facial bone defect according to an embodiment of the present application is applied.
2 to 4 are views for explaining an implant for repairing a facial bone defect according to the first embodiment of the present application, and FIG. 2 is a perspective view, FIG. 3 is a plan view, and FIG. 4 is a bottom view.
5 to 7 are views for explaining an implant for repairing a facial bone defect according to a second embodiment of the present application, and FIG. 5 is a front view, FIG. 6 is a rear view, and FIG. 7 is a view showing an actual clinical application. It is a drawing.
8 to 10 are views for explaining an implant for repairing a facial bone defect according to a third embodiment of the present application, and FIG. 8 is a front view, FIG. 9 is a rear view, and FIG. 10 is a view showing an actual clinical application. It is a drawing.
11 to 13 are views for explaining an implant for repairing a facial bone defect according to a fourth embodiment of the present application, and FIG. 11 is a front view, FIG. 12 is a rear view, and FIG. 13 is a view showing an actual clinical application. It is a drawing.
14 and 15 are views for explaining an implant for repairing a facial bone defect according to a fifth embodiment of the present application, and FIG. 14 is a front view and FIG. 15 is a rear view.

Hereinafter, the present application will be described in detail with reference to the accompanying drawings.

Hereinafter, the term "defective part" collectively refers to a part that is not in a normal state, such as a bone that does not exist due to a fracture or surgery (ie, the bone that should originally exist is completely lost), or where the bone to be connected is separated. It should be understood as doing.

Hereinafter, the term "repair target bone" refers to a bone including a region where a defect has occurred, and all kinds of bones may correspond to this to repair a defect, but representatively, cheekbones and temporal bones may correspond to this. I can.

Hereinafter, the term "phase optimization" refers to the minimization of the implant-forming material and optimization of the load distribution by reinforcing the part where the result of deformation or stress changes significantly after applying a load to the implant, and removing the part with little change ( In other words, it means a concept that can achieve cost and performance optimization). A homogenization technique and a topology optimization based on a density method may be typically applied thereto, but the present specification is not limited thereto.

First, a configuration of an implant for repairing a facial bone defect according to an embodiment of the present application will be schematically described.

The implants (100, 200, 300, 400, 500) for restoring facial bone defects according to the embodiment of the present application include bodies (110, 210, 310, 410, 510) and protrusions (120, 220, 320, 420, 520) Includes.

The body (110, 210, 310, 410, 510) is a component that forms the appearance of the implant, and the protrusions (120, 220, 320, 420, 520) protrude from the body (110, 210, 310, 410, 510) to repair It is a configuration that is arranged and connected to the target bone to repair the defect.

The body 110, 210, 310, 410, 510 has one or more fastening grooves through which the screw passes, and the implant may be fixed by passing the screw through the fastening groove and being inserted into the bone to be repaired.

In addition, the body (110, 210, 310, 410, 510) is a frame (111, 211, 311, 411, 511) and a frame (111) made of one or more members formed in a portion in contact with the cortical bone of the bone to be repaired. , 211, 311, 411, 511) includes a three-dimensional mesh (mesh) fusion portion (112, 212, 312, 412, 512) connecting one or more members to each other, wherein the mesh structure It refers to a structure in which a certain structure is repeated, such as a lattice structure. The shape is not limited, but a mesh structure in which a quadrangular structure is repeated may be applied, and the mesh structure is connected to each other in three dimensions to connect one or more members of the frames 111, 211, 311, 411, 511 to each other. It can be.

The fusion parts 112, 212, 312, 412, and 512 are composed of a three-dimensional mesh, and a plurality of pores (spaces) are formed therein. As the bone to be repaired grows through this space, the bone union between the implant (100, 200, 300, 400, 500) and the bone to be repaired can be firmly achieved, thereby improving affinity with soft tissues such as muscles, ligaments, and fascia. .

The mesh spacing of the fusion parts 112, 212, 312, 412, and 512 in the mesh structure (ie, the spacing between any one grid and the adjacent grid) may be 1.5 mm or less. This means the length of the edge of the net formed in the fusion parts 112, 212, 312, 412, 512, and if it is larger than 1.5mm, the growing bone is in the inner space of the fusion parts 112, 212, 312, 412, 512 Penetration becomes easier, but on the contrary, the bone union with the bone to be repaired is weakened, so that the fixation with the implant may be difficult. More specifically, it is preferable that the net spacing in the mesh structure is 1.2 mm.

In addition, the surface of the implant (100, 200, 300, 400, 500) in contact with the bone to be repaired (that is, the body (110, 210, 310, 410, 510) and the protrusions (120, 220, 320, 420, 520) The inner profile) may have a shape such that it is in close contact with a bone to be repaired or a piece of remaining bone located at a defect portion of the bone to be repaired. That is, the curvature and shape may correspond to each other so that the surface in contact with the bone to be restored is in close contact with the bone fragment to be repaired or the fragment of the bone to be repaired, and thus, even if the implant is implanted, the original bone shape is maintained as much as possible. Original restoration can be achieved.

The inner profiles of the bodies 110, 210, 310, 410, 510 and the protrusions 120, 220, 320, 420, 520 may be determined based on a medical image of a patient to be implanted before implantation, and the The medical image may be an X-ray image or a CT image, but a CT image is preferable for a more precise profile determination.

The protrusions 120, 220, 320, 420, and 520 are configured to protrude from the bodies 110, 210, 310, 410, and 510 to be connected to the bone to be repaired, or to be disposed on the defect of the bone to be repaired. The defective part is a part that is incomplete due to the loss of the original bone or due to a fracture (i.e., a gap exists in the bone to be repaired), so the part that is inserted or lost in this gap is supplemented by filling the missing part. will be.

Like the body (110, 210, 310, 410, 510), the protrusions (120, 220, 320, 420, 520) have a shape that closely adheres to the bone to be repaired or to the fragment of the remaining bone located at the defect of the bone to be repaired. Can have. That is, the curvature and shape may correspond to each other so that the surface in contact with the bone to be restored is in close contact with the bone fragment to be repaired or the fragment of the bone to be repaired, and thus, even if the implant is implanted, the original bone shape is maintained as much as possible. Original restoration can be achieved.

The fastening grooves 130, 230, 330, 430, and 530 are configured to pass through the bodies 110, 210, 310, 410, and 510, respectively, to provide a space into which a screw can be inserted. The screw may be inserted into the bone to be repaired through the fastening grooves 130, 230, 330, 430, and 530, through which the implant may be fixed to the bone to be repaired.

Fastening grooves (130, 230, 330, 430, 530) may be formed through the portion of the frame (111, 211, 311, 411, 511) is formed, but the fusion portion (112, 212, 312, 412, 512) It may be formed through the portion where is formed (Fig. 7).

Since the implant is implanted in the defective part of the bone to be repaired, it generally penetrates the frames 111, 211, 311, 411, 511 made of one or more members formed at the edges of the body (110, 210, 310, 410, 510). Fastening grooves (130, 230, 330, 430, 530) are formed, but if the middle part as well as the edge can be fixed with the bone to be repaired, since it can maintain a more rigid fixation force, the fusion parts (112, 212, 312, 412, 512) also fastening grooves (130, 230, 330, 430 530) are formed, it is possible to provide a more improved fixing force.

In addition, in the body 510 of the implant 500 according to the embodiment of the present application, a suture groove 540 through which the suture passes for suturing with soft tissues (muscles, ligaments, fascia, etc.) adjacent to the bone to be repaired is protruding. It may be further formed through the fusion portion 522, the size of which is preferably smaller than the fastening grooves 130, 230, 330, 430, 530 through which the screw passes. The suture groove 540 can be further fixed to the surrounding soft tissue, so that it is possible to provide a more improved fixing force.

Hereinafter, the implants 100, 200, 300, 400, 500 for repairing a facial bone defect according to an embodiment of the present application will be described in more detail.

First, an implant 100 for repairing a facial bone defect according to the first embodiment will be described with reference to FIGS. 2 to 4.

The implant 100 for repairing a facial bone defect according to the first embodiment includes a body 110 and a protrusion 120.

A frame 111 is formed along the circumference of the body 110 in contact with the cortical bone of the bone to be repaired, and one fastening groove 130a, 130b is formed through the frame 111 at both ends in the longitudinal direction. . In addition, in the inner space of the frame 111 other than the fastening grooves 130a and 130b, a fusion part 112 having a mesh structure is formed.

The protrusion 120 protrudes from the body 110 and has a shape that can fit snugly into the bone defect, and the protrusion 120 is also formed with a frame 121 at each corner, and the inner space is a fusion part of a mesh structure. 122 is formed.

In the case of the implant 100 for repairing a facial bone defect according to the first embodiment, it has the advantage that it can be used not only for repairing a defect in the facial bone, but also for repairing a defect in another area.

Next, an implant 200 for repairing a facial bone defect according to a second embodiment will be described with reference to FIGS. 5 to 7.

The implant 200 for repairing a facial bone defect according to the second embodiment is used for reconstruction by implanting an implant without removing the bone when a fragmented bone exists in the defective portion of the bone to be repaired.

The implant 200 for repairing a facial bone defect according to the second embodiment includes a body 210 and a protrusion 220.

The shape of the body 210 has a shape corresponding to the original shape of the bone to be repaired in which the defect has occurred.In the case of FIG. 7, a defect occurs between the cheekbone and the temporal bone, but a fragmented bone shown in yellow exists. While covering the bone, it is shown to have a shape corresponding to the shape of the bone in the portion where the defect occurs.

It can be seen that the frame 211 is formed in the portion of the body 210 that contacts the cortical bone of the bone to be repaired, and the fusion portion 212 having a mesh structure is formed in the portion that is not.

In addition, the protrusion 220 that fills the portion where the defect occurs may include a protrusion frame 221 formed along the periphery for phase optimization, and a protrusion union 222 of a mesh structure filling the inner space thereof. It is preferable that the height of the fusion part 222 has the same height as the height of the protrusion frame 221 protruding from the body 210. Accordingly, the protrusion 220 can fill the portion where the defect has occurred, and at the same time, the bonding force with the surrounding tissue is improved.

As described above, of the body 210 and the protrusion 220, more specifically the frame 211 and the fusion part 212 of the body 210 and the protrusion frame 221 and the protrusion fusion part 222 of the protrusion 220 It is preferable that the inner profile has a shape such that it is in close contact with the bone to be repaired or the defect portion of the bone to be repaired.

In addition, one or more fastening grooves 230a, 230b, 230c, 230d, 230e, 230f, 230g, 230h are formed along the edge of the body 210 to provide a space in which a screw can be inserted.

Next, an implant 300 for repairing a facial bone defect according to a third embodiment will be described with reference to FIGS. 8 to 10.

The implant 300 for restoring a facial bone defect according to the third embodiment is used when a simple fixation implant such as the implant 100 in the first embodiment is difficult to be applied when the bone is lost and the defect is large.

The implant 300 for repairing a facial bone defect according to the third embodiment includes a body 310 and a protrusion 320.

The shape of the body 310 has a shape corresponding to the original shape of the bone to be repaired in which the defect has occurred.In the case of FIG. 10, a defect occurs between the cheekbone and the temporal bone, but the bone in the part where the defect occurs is completely lost to an empty space. As the case of existence, it is shown that the defect has a shape corresponding to the shape of the bone of the part.

It can be seen that a frame 311 is formed in a portion of the body 310 that contacts the cortical bone of the bone to be repaired, and a fusion portion 312 having a mesh structure is formed in a portion that is not.

In addition, the protrusion 320 filling the portion where the defect occurs may include a protrusion frame 321 formed along the periphery for phase optimization, and a protrusion union 322 having a mesh structure filling the inner space thereof. It is preferable that the height of the fusion part 322 has the same height as the height of the protrusion frame 321 protruding from the body 310. Accordingly, the protrusion 320 can fill the portion where the defect has occurred, and at the same time, the bonding force with the surrounding tissue is improved.

In addition, one or more fastening grooves (330a, 330b, 330d, 330e, 330f, 330g, 330h, 330i) are formed along the edge of the body 310 to provide a space into which a screw can be inserted. A fastening groove 330c penetrating through 312 is further formed to provide a more improved fixing force.

Next, an implant 400 for repairing a facial bone defect according to a fourth embodiment of the present application will be described with reference to FIGS. 11 to 13.

The implant 400 for repairing a facial bone defect according to the fourth embodiment includes a body 410 and a protrusion 420.

The shape of the body 410 is shown to have a shape connected to the surrounding bones while covering the defect of the bone to be repaired where the defect has occurred.

It can be seen that a frame 411 is formed in a portion of the body 410 that contacts the cortical bone of the bone to be repaired, and a fusion portion 412 having a mesh structure is formed in a portion that is not.

In addition, the protrusion frame 421 of the protrusion 420 for phase optimization has a shape corresponding to the shape of the defect inside the frame 411 of the body 410 and protrudes from the body 410, and the protrusion of the mesh structure is fused. The portion 422 fills the inner space of the protrusion frame 421 of the protrusion 420. It is preferable that the height of the protrusion union 422 is the same as the height of the protrusion frame 421 protruding from the body 410. Accordingly, the protrusion 420 can fill the portion where the defect occurs, and at the same time, the bonding force with the surrounding tissue is improved.

In addition, along the edge of the body 410, one or more fastening grooves (430a, 430b, 430c, 430d, 430e) penetrate between the frame 411 of the body 410 and the protrusion frame 421 of the protrusion 420 It is formed to provide a space in which the screw can be inserted.

Next, an implant 500 for repairing a facial bone defect according to a fifth embodiment of the present application will be described with reference to FIGS. 14 and 15.

The implant 500 for repairing a facial bone defect according to the fifth embodiment includes a body 510 and a protrusion 520.

The shape of the body 510 has a shape corresponding to the original shape of the bone to be repaired in which the defect has occurred.

It can be seen that a frame 511 is formed in a portion of the body 510 in contact with the cortical bone of a bone to be repaired, and a fusion portion 512 having a mesh structure is formed in a portion that is not.

In addition, the protrusion 520 that fills the part where the defect occurs may include a protrusion frame 521 formed along the periphery for phase optimization, and a protrusion union 522 having a mesh structure that fills the inner space thereof. The height of the fusion part 522 is preferably the same as the height of the protrusion frame 521 protruding from the body 510. Accordingly, the protrusion 520 can fill the portion where the defect has occurred, and at the same time, the bonding force with the surrounding tissue is improved.

In the fifth embodiment, the implant 500 further includes suture grooves 540a, 540b, 540c, 540d, and 540e, unlike other implants. The suture grooves 540a, 540b, 540c, 540d, 540e may be formed through the protrusion fusion portion 522, and these suture grooves 540a, 540b, 540c, 540d, 540e are as shown in FIG. The frames may be arranged in a row and forming the suture grooves 540a, 540b, 540c, 540d, and 540e are connected to the protrusions 520.

The suture passes through the suture grooves 540a, 540b, 540c, 540d, 540e, and is further sutured with the surrounding soft tissues (muscles, ligaments, fascia, etc.), thereby forming the fastening grooves 530a, 530b, 530c, 530d, 530e through a screw. Through this, it is possible to provide an improved fixation force rather than being fixed only to the bone to be repaired.

As described above, in the present specification, the present application has been described with reference to the embodiment shown in the drawings so that those skilled in the art can easily understand and reproduce this application, but this is only illustrative, and those skilled in the art can use various modifications and equivalents from the embodiment of the present application. It will be appreciated that embodiments are possible. Therefore, the scope of protection of the present application should be determined by the claims.

100, 200, 300, 400, 500: implant
110, 210, 310, 410, 510: body
111, 211, 311, 411, 511: frame
112, 212, 312, 412, 512: fusion part
120, 220, 320, 420, 520: protrusion
121, 221, 321, 421, 521: protrusion frame
122, 222, 322, 422, 522: protrusion union
130, 230, 330, 430, 530: fastening groove
540: suture groove

Claims (10)

A body through which one or more fastening grooves through which the screw passes; And
Includes; one or more protrusions protruding from the body and disposed at the defective portion of the bone to be repaired,
The body,
A frame made of one or more members formed in a portion of the body that contacts the cortical bone of the bone to be repaired; And
Including; a mesh (mesh) fusion portion connecting one or more members of the frame to each other,
The at least one protrusion includes at least one protrusion frame protruding from the body for phase optimization, and at least one protrusion joining part of a mesh structure filling a space inside the at least one protrusion frame,
Each of the at least one protrusion fusion portion has a height corresponding to a height of a corresponding protrusion frame,
The body and the inner profile of the one or more protrusions have a shape that is in close contact with the bone to be repaired or a fragment of the remaining bone located at the defect of the bone to be repaired
Implant for restoring facial bone defects.
The method of claim 1,
The protrusion is disposed in the defect portion of the facial bone including the cheekbone, temporal bone and lower jaw bone,
Implant for restoring facial bone defects.
delete The method of claim 1,
The profile of the body and the at least one protrusion is determined based on a CT image of an object having the bone to be repaired,
Implant for restoring facial bone defects.
delete The method of claim 1,
The one or more fastening grooves are formed through the frame,
Implant for restoring facial bone defects.
The method of claim 6,
The one or more fastening grooves are further formed through only the fusion portion,
Implant for restoring facial bone defects.
The method of claim 7,
One or more suture grooves through which the suture passes are formed in the fusion portion of the one or more protrusions,
Implant for restoring facial bone defects.
The method of claim 8,
The implant,
A screw is fixed by being inserted into the bone to be repaired through the one or more fastening grooves,
Implant for restoring facial bone defects.
The method of claim 1,
The fusion part and the protrusion fusion part mesh spacing within the mesh is 1.5mm or less,
Implant for restoring facial bone defects.

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