KR102076634B1 - Maxillary skeletal expander - Google Patents

Abstract

Disclosed is a maxillary skeletal expander fixed in an oral cavity to expand a maxillary bone to left and right sides. According to the present invention, the maxillary skeletal expander comprises: first and second bodies (10, 20); a gap adjustment member (30) connecting the first and second bodies to adjust a horizontal gap between the first and second bodies; and a coupler guide member (70) guiding the implantation position and direction of a coupler for fixing the first and second bodies to the maxillary bone. The first and second bodies have insertion holes (16, 18, 26, 28) on front and rear sides, respectively, to insert the coupler guide member thereinto wherein an interval between the insertion holes (16, 26) formed on the rear side of the first and second bodies can be different from an interval between the insertion holes (18, 28) formed on the front side of the first and second bodies. According to the present invention, expandability caused by the maxillary skeletal expander can be effectively transferred to the maxillary bone.

Description

Archery Expansion Unit {MAXILLARY SKELETAL EXPANDER}

The present invention relates to an apparatus for expanding the arch, which is fixed in the oral cavity and enlarges the maxilla to the left and right.

The jaw consists of the maxilla and the mandible, and the upper teeth are located in the maxilla and the lower teeth are located in the mandible. In order to perform the food chewing exercise, the oral structure is made so that the upper teeth and the lower teeth can be chewed with each other according to the jaw joint movement.

However, the lower teeth may protrude forward than the upper teeth, or the facial skeleton (especially the jawbone) may grow abnormally and malocclusion may occur. Orthodontic treatment may be performed to straighten the teeth to correct them.

In the orthodontic treatment, orthodontic treatment may be performed when it is impossible to treat only by the movement of the teeth, and the arch expansion device is used to enlarge the maxilla to the left and right.

The arch expansion device is a device used for orthodontic treatment of malocclusion patients whose maxilla is less developed than the mandible, and is intended to facilitate orthodontic treatment by expanding the maxilla.

Republic of Korea Registration No. 10-1718928 (archbow expansion device using a mini screw) describes a conventional arch expansion device.

The arch expansion device fixes the maxilla by fixing the two main bodies to the left and right sides of the maxilla, one by one, and extending the interval between the two main bodies using an extension screw. In order to fix the main body to the maxilla, a screw member is used. In view of the skeletal structure of the jawbone, it is required to insert the screw member at an appropriate depth at an appropriate position.

Figure 1 schematically shows a view of the palate (palate) in the oral cavity. The bone thickness of the maxilla is generally thicker on the toothed side, thinner from the anterior (forearm side) to the posterior (throat side) of the maxilla, and thinner as it moves from the virtual centerline (C) to the left and right, and then around the tooth. Thickens again. In Fig. 1, the direction in which the bone thickness of the maxilla becomes thinner is indicated by an arrow.

As described above, when the jaw expanding device is fixed to the maxilla, if the screw member is inserted at a point where the thickness of the maxilla is thin, a problem may occur in which the maxilla is penetrated by the screw member. The maxilla is a skeleton that distinguishes the oral cavity from the nasal cavity, so when the maxilla penetrates, the tip of the screw member is exposed into the nasal cavity. Since there may be various bacteria introduced through the nostrils during breathing, the wound caused by the screw member may be infected and cause inflammation.

Also, when only the palate (palate) portion of the maxilla is seen except for the periphery of the maxilla, the thickness of the maxilla becomes thinner from the front to the rear and thinner from the center to the left and right, so that the screw member is positioned relatively to the posterior left and right sides of the palate. Since the thickness of the thinner than the center of the expansion force caused by the arch expansion device may not be effectively transmitted to the maxilla.

The present invention has been made in view of the above-described points, and when fixing the arch extension device to the maxilla, the screw member can be fastened to a portion where the bone thickness of the maxilla is relatively thick, and the screw member does not penetrate the maxilla. It is intended to provide an arch expansion device that optimizes the fastening position and angle of the screw member.

According to an aspect of the present invention for achieving the above object, the arch form expansion device is fixed in the oral cavity to enlarge the maxilla to the left and right, the first body and the second body; A gap adjusting member connecting the first body and the second body to adjust a horizontal gap between the first body and the second body; A fastener guide member for guiding an installation position and an installation direction of a fastener for fixing the first body and the second body to the maxilla; It includes, The first body and the second body, respectively has an insertion hole formed in the front and rear so that the fastener guide member can be inserted, respectively in the rear of the first body and the second body The interval between the formed insertion holes and the interval between the insertion holes formed in front of the first body and the second body, respectively, is provided with a different types of arch.

According to one embodiment, the spacing between the insertion holes respectively formed in the rear of the first body and the second body, the spacing between the insertion holes respectively formed in front of the first body and the second body. It may be formed narrower than.

According to one embodiment, the fastener guide member may be inserted to be movable in the vertical direction in the insertion hole.

According to one embodiment, the fastener guide member has a through hole formed to allow the fastener to pass along the longitudinal direction of the fastener guide member, and the axial direction of the through hole is the fastener guide member. It may be inclined at an angle with respect to the longitudinal direction of.

According to one embodiment, the through hole of the fastener guide member inserted into the rear insertion hole of the first body and the through hole of the fastener guide member inserted into the rear insertion hole of the second body, the arch It may be formed to be closer to each other toward the bottom of the expansion device.

According to one embodiment, the through hole of the fastener guide member inserted into the front insertion hole of the first body, and the through hole of the fastener guide member inserted into the front insertion hole of the second body, the arch It may be formed to move away from each other toward the bottom of the expansion device.

According to one embodiment, the fastener guide member has a through hole formed so that the fastener can pass along the longitudinal direction of the fastener guide member, the axial direction of the insertion hole of the arch expansion device It is inclined at an angle with respect to the vertical direction, and the axial direction of the through hole may coincide with the longitudinal direction of the fastener guide member.

According to one embodiment, the arch expansion device, to guide the linear movement of the first body and the second body when adjusting the horizontal distance between the first body and the second body by the gap adjusting member. Expansion guide member for; A rotation preventing member for preventing the rotation of the gap adjusting member unintentionally; It may further include.

According to the present invention, there can be provided a arch expansion device for optimizing the fastening position and angle of the screw member. According to the arch expansion device of the present invention, when the arch expansion device is fixed to the maxilla, the screw member can be fastened to a portion where the bone thickness of the maxilla is relatively thick, and the screw member can not penetrate the maxilla.

Accordingly, according to the arch expansion device of the present invention, the fastening position and the angle of the screw member is guided so that the screw member can be inserted into a portion where the thickness of the maxilla is relatively thick, thereby preventing the maxilla from being penetrated by the screw member. It is possible to prevent the risk of infection by the bacteria present in the nasal passages.

In addition, according to the arch expansion device of the present invention, since the screw member can be inserted into a relatively thick portion of the maxilla, it is possible to effectively transmit the expansion force caused by the arch spread device to the maxilla.

1 is a view showing a view of the palate (palate) in the oral cavity.
2 is a perspective view of the arch expansion device according to an embodiment of the present invention.
3 is an exploded perspective view of the arch expansion device according to an embodiment of the present invention.
4 is a partial plan view of the arch expansion device according to an embodiment of the present invention.
5 is a partial front view of the arch expansion device according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view taken along the line AA of FIG. 4, in (a) the fastener guide member for guiding the screw is moved downward, and (b) is shown in the upward movement.
FIG. 7 is a cross-sectional view taken along line BB of FIG. 4.
FIG. 8 is a view similar to FIG. 7 showing a state in which a screw is inserted into the fastener guide member.
9 is a cross-sectional view similar to FIG. 7 of the arch expansion apparatus according to a modification of the present invention.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiments of the present invention will be described, the configuration and operation of the present invention shown in the drawings and described by it will be described as an example, thereby The technical spirit of the present invention and its core configuration and operation are not limited.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the arch expansion device according to the present invention.

2 to 5 show a perspective view, an exploded perspective view, a partial plan view, and a partial front view of the arch expansion device according to an embodiment of the present invention. As shown in Figures 2 to 5, the arch expansion device, a pair of left and right body (first body 10 and second body 20) having a symmetrical shape with each other, and the first and second body A gap adjusting member 30 configured to connect the first and second bodies 10 and 20 to each other and to adjust a horizontal gap between the first and second bodies 10 and 20; It is installed to be movable relative to the vertical direction relative to the 20) and includes a fastener guide member 70 for guiding fasteners 80, such as screws for fixing the first and second bodies (10, 20) to the maxilla can do.

The arch expansion device is used to extend the horizontal gap between the first body 10 and the second body 20 by rotating the gap adjusting member 30. The expansion guide member 40 for guiding the linear movement and the rotation preventing member 50 for preventing the rotation of the intentional gap adjusting member 30 may be further included.

The arch expansion device further includes a tooth fixing member 60 extending from the first and second bodies 10 and 20 so as to connect and fix the first and second bodies 10 and 20 and the teeth. can do.

The first body 10 and the second body 20 each have screw holes 12 and 22 to which the gap adjusting member 30 can be screwed. The screw hole 12 formed in the first body 10 and the screw hole 22 formed in the second body 20 have a female screw thread therein, and the screw hole 12 of the first body 10. The rotation direction of the formed female thread and the spiral direction of the female thread formed in the screw hole 22 of the second body 20 are opposite to each other.

The gap adjusting member 30 includes a main body portion 32 formed in a cylindrical shape at the center thereof, and first and second screw portions 34 and 36 extending to both sides of the main body portion 32 and each having a male thread. It includes. The first threaded portion 34 is screwed into the screw hole 12 of the first body 10, and the second threaded portion 36 is screwed into the screw hole 22 of the second body 20.

Spiral threads of male threads formed on the first and second threaded portions 34 and 36, as well as spiral directions of the female threads formed on the screw holes 12 and 22 of the first and second bodies 10 and 20, respectively. The directions are opposite to each other. Accordingly, when the gap adjusting member 30 rotates, the first and second bodies 10 and 20 may be configured to move in opposite directions to each other. That is, when the gap adjusting member 30 rotates in one direction, the first body 10 and the second body 20 move in a direction away from each other, and when the gap adjusting member 30 rotates in the opposite direction, the first body ( 10) and the second body 20 can move in a direction closer to each other.

The rotation of the gap adjusting member 30 is performed by the user inserting a separate tool (not shown) into the plurality of rotation holes 32a formed in the main body 32, and then the user applies a force to the tool to the main body 32. ) By moving the tool in the circumferential direction.

The first body 10 and the second body 20 each have guide holes 14 and 24 into which the extended guide member 40 can be slidably inserted. As shown in FIGS. 2 and 3, two extension guide members 40 are arranged in parallel with the gap adjusting member 30 interposed therebetween, so that the first body 10 and the second body 20 are accordingly disposed. ), Two guide holes 14 and 24 are formed, respectively.

Each of the extended guide member 40 is an elongated rod shape, and a coupling groove 42 for engaging the anti-rotation member 50 is formed on an outer circumferential surface of the center portion toward the gap adjusting member 30. Two coupling grooves 42 may be formed side by side. Coupling grooves 42 respectively formed in the two extension guide members 40 are disposed to face each other, and both ends of the rotation preventing member 50 are fitted into and fixed to the coupling grooves 42 facing each other. The anti-rotation member 50 may be fixedly coupled to the coupling groove 42 of the expansion guide member 40 by welding, for example.

The anti-rotation member 50 fixed between the two extension guide members 40 is arranged to contact the main body portion 32 of the gap adjusting member 30. 2 to 4, although the two rotation preventing members 50 are arranged to contact both sides of the main body portion 32, one rotation preventing member 50 may be used.

When the two anti-rotation members 50 are arranged to contact both sides of the main body portion 32, the anti-rotation members 50 are positioned at predetermined distances from both longitudinal ends of the extended guide member 40 toward both ends. May be coupled to be spaced apart from each other. That is, the two coupling grooves 42 formed on the surface of the expansion guide member 40 so that the two rotation preventing members 50 are coupled to each other, respectively, from the longitudinal center position of the expansion guide member 40 toward both ends thereof. It is formed at a position away from the predetermined distance.

The arch expansion device, the first and second body (10, 20) by rotating the gap adjusting member 30, which is screwed to the two bodies (that is, the first and second body (10, 20)) in one direction Forces (expansion force) that are trying to open each other are generated, and this force is used to expand the maxilla. Therefore, the force is always applied to the arch expansion device in the contracting direction (ie, the direction in which the first and second bodies 10 and 20 are closer to each other), and the expansion force is lost when the gap adjusting member 30 rotates in the opposite direction. Therefore, the arch expansion device must be equipped with a rotation preventing function.

However, since the force acting on the arch expansion device is concentrated at the center point of the gap adjusting member 30 and the expansion guide member 40, the two rotation preventing members 50 which perform the rotation preventing function are expanded guide members ( It is less susceptible to deformation to be installed at a position away from the longitudinal center point of 40).

In addition, when the two anti-rotation members 50 are arranged to contact both sides of the main body portion 32, even if one of the two anti-rotation members 50 loses function, the other one continues to prevent rotation. Can be performed.

In order to prevent any rotation of the gap adjusting member 30 by the rotation preventing member 50, a recess is formed in the main body 32 of the gap adjusting member 30, and the rotation preventing member 50 has elasticity. It has a convex portion that can be inserted into the recess. The concave portion may be formed to have a plurality of circularly disposed on both surfaces of the body portion 32, and the convex portion may have a cantilever shape.

The rotation preventing member 50 may be restricted in movement as the convex portion of the rotation preventing member 50 is inserted into the recess. The convex portion of the anti-rotation member 50 has an elastic force and deforms when an external force is applied, and returns to an initial position when the external force is removed. Therefore, when the user rotates the main body portion 32 of the gap adjusting member 30 using a tool, the engagement between the convex portion and the concave portion can be released while the convex portion is elastically deformed. When the body portion 32 rotates, another recess adjacent to the previous recess in which the engagement is released approaches the position of the convex portion, and the rotation of the body portion 32 continues so that the body portion 32 is rotated by a predetermined angle. As it rotates, the convex portion is inserted into and engaged with another recess. In this manner, the convex portion and the concave portion are engaged and released at every predetermined angle during rotation of the main body portion 32. When the user stops the rotation of the main body portion 32 while the convex portion and the concave portion are engaged, even if a reaction force against the force to expand the maxilla is applied to the arch expansion device, the gap adjusting member 30 is prevented by the rotation preventing member 50. It is possible to prevent the unintentional rotation of the) and to maintain the gap between the first and second body (10, 20).

As shown in FIG. 3, the anti-rotation member 50 has a convex portion configured to engage with a concave portion formed in the main body portion 32 of the gap adjusting member 30. As described above, the convex portion of the rotation preventing member 50 is seated in a recess formed in the main body 32 of the gap adjusting member 30 so that the gap adjusting member 30 does not turn in the opposite direction. When the convex portion rotates from the concave portion once to rotate the gap adjusting member 30, the convex portion is settled again in the next concave portion. During this operation, the convex portion deforms elastically and then again forms the first concave portion in the next concave portion. It must be seated without deformation. According to this embodiment, since the convex part of the rotation preventing member 50 has a cantilever structure, it is possible to rotate the space | interval adjusting member 30 without applying an excessive force, and convex as an excessive force is applied to the convex part. It is possible to prevent the possibility of the deformation permanently.

Each of the first body 10 and the second body 20 has fixing holes 15 and 25 through which the tooth fixing member 60 connected to the teeth can be inserted and fixed. The tooth fixing member 60 inserted into the fixing hole 15 formed in the first body 10 moves together with the first body 10 and inserted into the fixing hole 25 formed in the second body 20. The tooth fixing member 60 moves together with the second body 20.

Connection means such as a band (not shown) may be attached to the distal end of the tooth fixing member 60, thereby fixing the tooth fixing member 60 to the teeth. In addition, although the tooth fixing member 60 is illustrated as a straight elongated rod in FIGS. 2 and 3, a tooth fixing member having various shapes such as a bent rod shape other than a straight line may be used. That is, the shape of the tooth fixing member does not limit the present invention.

The tooth fixing member 60 may be fixed to the fixing holes 15 and 25 of the first and second bodies 10 and 20 by welding, for example, or may be detachably mounted by screwing or the like. It may be.

The first body 10 and the second body 20, the fastener guide member 70 for guiding the fastener 80 (see Fig. 8), such as screws for fixing to the maxilla, in the vertical direction And a rear insertion hole 16, 26 and a front insertion hole 18, 28 which are movably inserted. As used herein, "rear" means molar or throat in the oral cavity, and "anterior" means incisor or apical in the oral cavity. 4, the upper part of the figure is the rear of the arch expansion apparatus, and the lower part of the figure is the front of the arch expansion apparatus.

As described with reference to FIG. 1, when only the palate (palate) portion of the maxilla, except for the periphery, is seen, the thickness of the maxilla becomes thinner from the front to the rear and thinner from the center to the left and right, in consideration of the change in the thickness of the maxilla It is necessary to determine the engagement position of the fastener.

According to the arch expansion device of the present embodiment, as shown in FIG. 4, between the rear insertion hole 16 formed in the first body 10 and the rear insertion hole 26 formed in the second body 20. The space | interval D1 of N is narrow compared with the space | interval D2 between the front insertion hole 18 formed in the 1st body 10, and the front insertion hole 28 formed in the 2nd body 20. As shown in FIG.

The fastener 80 such as a screw fastened to the maxilla is guided by the fastener guide member 70, and the mounting position and the direction thereof are guided, and the fastener guide member 70 includes the first and second bodies 10 and 20. Since it is inserted into the rear insertion holes 16 and 26 and the front insertion holes 18 and 28 formed in the above, the engagement position of the fastener 80 is the rear insertion holes 16 and 26 and the front insertion holes 18 and 28. ) Accordingly, in the rear, where the thickness of the maxilla is relatively thin compared to the front, the fastener can be coupled to a central portion where the thickness of the maxilla is relatively thick.

According to the arch expansion device of the present embodiment, the two fasteners 80 placed in front of the front teeth close to the front teeth are placed by the front insertion holes 18, 28 having a relatively large gap (see D2 in FIG. 4). Since is determined, a wide space is placed to enable a stable fixing of the arch expansion device. In addition, the two fasteners 80 to be implanted close to the throat are placed by the relatively narrow rear insertion holes 16 and 26 (see D1 in FIG. 4), so that the spacing is narrow. The thickness of the maxilla can then be coupled to the relatively thick central portion.

Accordingly, according to the arch expansion device of the present invention, it is possible to stably secure the fixed state by the two fasteners that are relatively spaced apart, and the fastener is inserted into a portion where the thickness of the maxilla is relatively thick. By making it possible, the maxilla can be prevented from being penetrated by fasteners such as screws, and it is possible to prevent the risk of infection of the penetrating site by bacteria present in the nasal cavity. In addition, according to the arch expansion device of the present invention, since the fasteners such as screws can be inserted into the relatively thick portion of the maxilla, it is possible to effectively transmit the expansion force caused by the arch extension device to the maxilla.

The fastener guide member 70 for guiding fasteners such as screws is provided with front insertion holes 18 and 28 and rear insertion holes 16 and 26 formed in front and rear of the first and second bodies 10 and 20, respectively. It is installed to be movable in the vertical direction. 6 is a cross-sectional view taken along the line AA of FIG. 4, (a) the fastener guide member 70 is moved downwards, (b) the fastener guide member 70 is moved upwards One state is shown. 7 and 8 are cross-sectional views taken along the line B-B of FIG. The screw is not shown in FIG. 7 and the screw is inserted into the fastener guide member.

The fastener guide member 70 having a substantially cylindrical shape is installed to be movable in the interior of the front insertion holes 18 and 28 and the rear insertion holes 16 and 26. The fastener guide members 70 inserted into the front and rear insertion holes 18 and 16 of the second body 20 as well as the front and rear insertion holes 18 and 16 of the first body 10 are all the same. Since both have a shape and a structure and operate in the same manner, the fastener guide member 70 inserted in the front insertion hole 28 of the second body 20 will now be described by way of example.

3 and 6, the fastener guide member 70 includes a through hole 72 formed to allow the fastener to pass therethrough, and a fastener from the first and second bodies 10 and 20. The guide member 70 may include a concave surface 74 formed to prevent the departure and to regulate the distance between the fastener guide member 70.

The concave surface 74 is made by partially forming one outer circumferential surface of the fastener guide member 70. As shown in FIG. 6, when the fastener guide member 70 is inserted into the rear and front insertion holes 16, 18; 26, 28 of the first and second bodies 10, 20, the fastener The concave surface 74 of the guide member 70 abuts against the tooth fixing member 60 inserted into the fixing holes 15 and 25 of the first and second bodies 10 and 20. As described above, the concave surface 74 is formed by processing a part of the outer circumferential surface of the fastener guide member 70 flat, so that the concave surface 74 is relatively concave compared to the outer circumferential surface of the fastener guide member 70. Is formed. As the tooth fixing member 60 as the restricting means abuts on the surface of the concave surface 74 formed as concave, the fastener guide member 70 can move up and down by only the vertical length of the concave surface 74. The travel length is regulated.

In order to allow the tooth fixing member 60 as a restricting means to abut on the surface of the concave surface 74 formed concave, the tooth fixing member 60 is rearward and front of the first and second bodies 10, 20. It protrudes into the insertion holes 16, 18; 26, 28.

The maxillary portion, to which the arch expansion device is mounted, is very narrow, and there are irregular and irregular curvatures, making it difficult to fully adhere the arch expansion device to the maxilla. Therefore, when the arch expansion device is fixed to the maxilla using fasteners such as screws, a gap occurs between the surface of the maxilla (ie, the palate) and the first and second bodies 10 and 20 of the arch expansion device. Done.

The arch expansion device according to the present embodiment has a structure in which the fastener guide member 70 can be moved up and down (that is, having a play) within a predetermined distance, so that when fasteners such as screws are placed, Fastener guide member 70 is moved to the maxillary side can be in close contact with the end surface of the fastener guide member 70 to the skin tissue of the maxilla. Thereby, the possibility of food debris entering into the wound part which arises at the time of implantation of a screw can be prevented, and the odor and inflammation by a rot can be prevented further.

In addition, as illustrated in FIGS. 7 and 8, the through hole 72 penetrating the inside of the fastener guide member 70 may be inclined obliquely. Specifically, as shown in FIG. 7, the central axis of the through hole 72, indicated by a dashed line, is directed toward another adjacent fastener guide member 70 as it goes down from the top of the arch expansion device. Can be tilted. Therefore, the axial direction of the through hole 72 is inclined at an angle with respect to the longitudinal direction of the fastener guide member 70.

When the direction in which the gap adjusting member 30 of the arch expansion device extends is called a horizontal direction, and when the direction perpendicular to this horizontal direction is called a vertical direction, the insertion direction of the fastener 80 is inclined at an angle with respect to the vertical direction. Lose.

For example, referring to FIG. 7, the front insertion holes 18 and 28 of the first and second bodies 10 and 20 into which the fastener guide member 70 is inserted are formed in the vertical direction, and the fastener guides. The through hole 72 formed in the member 70 may be formed in a direction inclined with respect to the vertical direction. Fastener guide inserted into the through hole 72 of the fastener guide member 70 inserted into the front insertion hole 18 of the first body 10 and the front insertion hole 28 of the second body 20. The through holes 72 of the member 70 may be formed to be closer to each other toward the bottom of the arch expansion device.

In addition, although not shown in the drawings, the through hole 72 of the fastener guide member 70 inserted into the rear insertion hole 16 of the first body 10 and the rear insertion hole of the second body 20. The through holes 72 of the fastener guide member 70 inserted in the 26 may be formed to be closer to each other toward the lower side of the arch expansion device.

Accordingly, as shown in FIG. 8, when the fastener 80 such as a screw is inserted into the through hole 72, the tip portions of the fastener 80 are positioned closer to each other than the head of the fastener 80. Can be.

The inclination direction of the through hole 72 is inclined only toward the fastener guide member 70 inserted into the different ones of the first and second bodies 10 and 20, as shown in FIGS. 6 and 7. It does not tilt toward the fastener guide member 70 inserted into the same body.

When the plurality of fasteners 80 are placed to fix the arch expansion device to the maxilla, as described above, the fixation portion of the maxilla is narrow and the implantation procedure is performed with the patient's mouth open. It is hard to see clearly. Therefore, since the fastener is difficult to be accurately placed in the vertical direction, when the plurality of fasteners are to be placed, the screw to be placed later may not find its place properly and may be difficult to be placed or the fastener may be broken.

The arch expansion device according to the present embodiment is guided by the fastener guide member 70 so that the fastener can be implanted with a certain angle, even when a plurality of fasteners are placed, each fastener in the correct position It can be placed, it is easy to place the implantation procedure and less likely to break the fastener.

In addition, the fastener is obliquely placed in the maxilla, the length of the fastener fixed in the bone of the maxilla increases relatively, it is possible to more efficiently transfer the expansion force of the arch expansion device.

9 is a cross-sectional view of the arch expansion device according to a modification of the present invention.

In the arch expansion apparatus according to the modification, the through-hole 72A penetrating the inside of the fastener guide member 70A is not obliquely formed, as compared to the arch expansion apparatus described with reference to FIGS. 2 to 8. There is a difference in that the insertion holes 18A, 28A of the first and second bodies 10A, 20A into which the fastener guide member 70A is inserted are formed to be inclined. Since the arch expansion apparatus according to the modification is the same as the arch expansion apparatus described with reference to FIGS. 2 to 8 except for the above difference, a detailed description of the same configuration is omitted.

9, only two fastener guide members 70A inserted in the front insertion hole 16A of the first body 10A and the front insertion hole 26A of the second body 20A are shown. The same applies to the rear insertion holes (not shown) of the first and second bodies 10A and 20A.

As in the modification shown in FIG. 9, when the front and rear insertion holes are formed obliquely instead of obliquely forming the through holes in the fastener guide member, the fastener is placed as indicated by the dashed-dotted line in FIG. 9. The direction can be inclined. That is, when the direction in which the interval adjusting member of the arch expansion device extends is called a horizontal direction, and when the direction perpendicular to this horizontal direction is called a vertical direction, the insertion direction of the fastener is inclined at an angle with respect to the vertical direction.

7 to 9, the fastener placement direction of the arch expansion device according to the embodiment and the modification of the present invention has been described as being inclined in the direction in which the front end portions of the fastener are close to each other, but the directions away from each other. It may be deformed obliquely.

As described above, in the detailed description of the present invention, specific embodiments have been described. However, various modifications may be made without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

10, 10A: first body, 12, 22: screw hole, 14, 24: guide hole, 15, 25: fixing hole, 16, 26: rear insertion hole, 18, 18A, 28, 28A: front insertion hole, 20 , 20A: second body, 30: gap adjusting member, 32: main body, 32a: rotating hole, 34: first threaded portion, 36: second threaded portion, 40: extended guide member, 42: coupling groove, 50: anti-rotation Member, 60: tooth fixing member, 70: fastener guide member, 72: through hole, 74: concave surface, 80: fastener.

Claims (8)

As a uterine expansion device is fixed in the oral cavity to enlarge the maxilla to the left and right,
A first body and a second body;
A gap adjusting member connecting the first body and the second body to adjust a horizontal gap between the first body and the second body;
A fastener guide member for guiding an installation position and an installation direction of the fastener for fixing the first body and the second body to the maxilla;
Including;
The first body and the second body, each having an insertion hole formed in the front and rear to be inserted into the fastener guide member,
The spacing between the insertion holes formed in the rear of the first body and the second body, respectively, and the spacing between the insertion holes respectively formed in front of the first body and the second body are different from each other,
The fastener guide member is inserted to be movable in the vertical direction in the insertion hole,
The fastener guide member is moved to the maxillary side when the fastener is placed, the end surface of the fastener guide member can be in close contact with the skin tissue of the maxillary side, arch expansion device. The method according to claim 1,
The interval between the insertion holes formed in the rear of the first body and the second body, respectively, is formed narrower than the interval between the insertion holes formed in front of the first body and the second body, Expansion unit. delete The method according to claim 1,
The fastener guide member has a through hole formed to allow the fastener to pass along the longitudinal direction of the fastener guide member,
The axial direction of the through-hole is inclined obliquely to the longitudinal direction of the fastener guide member, the arch expansion device. The method according to claim 4,
The through hole of the fastener guide member inserted into the rear insertion hole of the first body and the through hole of the fastener guide member inserted into the rear insertion hole of the second body face downward of the arch. The arch expansion device is formed to be closer to each other. The method according to claim 4,
The through hole of the fastener guide member inserted into the front insertion hole of the first body and the through hole of the fastener guide member inserted into the front insertion hole of the second body face downward of the arch expansion device. The archery expansion device is formed to move away from each other. The method according to claim 1,
The fastener guide member has a through hole formed to allow the fastener to pass along the longitudinal direction of the fastener guide member,
And the axial direction of the insertion hole is inclined at an angle with respect to the vertical direction of the arch expansion device, and the axial direction of the through hole coincides with the longitudinal direction of the fastener guide member. The method according to claim 1,
An expansion guide member for guiding linear movement of the first body and the second body when adjusting the horizontal gap between the first body and the second body by the gap adjusting member;
A rotation preventing member for preventing the rotation of the gap adjusting member unintentionally;
Further comprising, the archery expansion device.

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