Maxillary skeletal expansion device and maxillary skeletal expansion system

Abstract

To provide an upper jaw bone skeleton expansion device comprising a screw absence part on a tip end part of a screw part on each of both sides of an interval adjusting member, capable of preventing bodies on both sides from separating screw parts on both sides, and improving fixing force of a screw implanted on an upper jaw bone and functions of a rotation prevention member.SOLUTION: An upper jaw bone skeleton expansion device comprises: a first body 10 coupled to an upper jaw bone; a second body 20 coupled to the upper jaw bone while facing the first body; an interval adjusting member 30 where a first screw 32 and a second screw 33 on both sides of a main body part 31 are screwed to the first body and the second body; and a rotation prevention plate 41 which has a rotation prevention member 42 where an elastic protrusion part protruded to the main body part is inserted into a rotation prevention groove which is provided along one side face edge of the main body part, for preventing unintended rotation of the interval adjusting member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a maxillary skeletal expansion device and a maxillary skeletal expansion system for orthodontic treatment of the maxilla. [Background technology]

[0002] Generally, the jawbone is made up of the maxilla and mandible. Upper and lower teeth are formed on the upper and lower sides of the jaw, connected to the maxilla and mandible, respectively, and the upper and lower teeth are structured to bite together in response to the movement of the temporomandibular joint, allowing the person to chew food.

[0003] In normal people, the maxilla is formed to protrude further forward than the mandible. However, there are cases where the maxilla is smaller than the mandible, resulting in malocclusion where the maxilla and mandible bite in the opposite direction. When malocclusion occurs, orthodontic treatment is performed to pull the maxilla forward and expand the upper teeth of the maxilla.

[0004] The maxillary skeletal expansion device is a device used in the orthodontic treatment of patients with malocclusion in which the maxilla is less developed than the mandible, and is a device that expands the maxilla to make orthodontic treatment easier.

[0005] In the conventional maxillary skeletal expansion device, the screw portions on both sides of the space adjustment member are screwed into both body bodies, and the space adjustment member is rotated to expand both body bodies away from each other, thereby performing orthodontic treatment.

[0006] However, in the maxillary skeletal expansion device, the entire screw portions on both sides of the distance adjustment member are made of threads, and when the distance adjustment member is rotated, the body members on both sides continue to expand, causing the screw portions on both sides to come off and become detached. Furthermore, not only was the function of the anti-rotation member reduced, resulting in a weak fixing force of the screw implanted in the maxillary bone, but there was also no dedicated tool capable of rotating the spacing adjustment member by the desired number of clicks. Summary of the Invention [Problem to be solved by the invention]

[0007] In order to solve the above-mentioned problems, the present invention provides a maxillary skeletal expansion device that has a non-threaded portion at the tip of the threaded portion on both sides of the distance adjustment member, thereby preventing both body bodies from coming off the threaded portions on both sides and improving the function of the rotation prevention member and the fixing force of the screw implanted in the maxillary bone.

[0008] The present invention provides a maxillary skeletal expansion system including a maxillary skeletal expansion device and a dedicated tool capable of rotating a spacing adjustment member by a set number of clicks. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the present invention provides a maxillary skeletal expansion device including a first body member connected to the maxilla, a second body member connected to the maxilla opposite to the first body member, a distance adjustment member having a first threaded portion and a second threaded portion on both sides of a body member screwed into the first body member and the second body member, and an anti-rotation plate including an anti-rotation member having an elastic protrusion protruding toward the body member that is inserted into an anti-rotation groove provided along one side edge of the body member to prevent unintentional rotation of the distance adjustment member.

[0010] In addition, the outer surface of the elastic protrusion is formed in a semicircular shape that matches the anti-rotation groove so that it can be inserted into the anti-rotation groove.

[0011] Furthermore, an unthreaded portion is provided at a tip of the first threaded portion and at a tip of the second threaded portion.

[0012] In addition, the first body member or the second body member is connected to the maxilla by a pair of first and second fixing members, and the first and second fixing members are implanted in a direction intersecting the expansion direction so as to approach the center of the maxilla, penetrating both sides of the first body member or both sides of the second body member, and are implanted in the maxilla at an angle so that the distance between them increases toward the lower end.

[0013] Further, a pair of first and second guide members are coupled to both sides of the first body body or both sides of the second body body, the first guide member is provided with a first through hole through which the first fixing member is penetrated and coupled, and the second guide member is provided with a second through hole through which the second fixing member is penetrated and coupled.

[0014] The first through hole and the second through hole are configured as inclined holes that guide the first fixing member and the second fixing member when they are inclined.

[0015] Further, a first guide pin and a second guide pin are coupled to the first body body and the second body body so as to penetrate through side surfaces of the first body body and the second body body, and the first body body and the second body body are movable along the first guide pin and the second guide pin.

[0016] In addition, an arm is connected to an outer side surface of the first body and an outer side surface of the second body, and the arm is connected to a tooth connecting member that is located between the first guide pin and the second guide pin and fixed to a tooth of the maxillary bone.

[0017] Furthermore, the anti-rotation plate is assembled so that an assembly space provided on one side thereof encloses a first coupling portion provided between the main body portion and the second screw portion, and both side ends are inserted into coupling grooves provided on the first guide pin and the second guide pin, and the anti-rotation member has a coupling space that corresponds to the assembly space of the anti-rotation plate, and the coupling space is assembled so as to enclose the first coupling portion.

[0018] In addition, a second coupling part is provided between the main body part and the first screw part, and a support plate facing the anti-rotation plate is provided, the support plate having an assembly space, and the assembly space of the support plate is assembled to enclose the second coupling part, and both side ends are assembled to be inserted into the coupling grooves of the first guide pin and the second guide pin.

[0019] The present invention provides a maxillary skeletal expansion device, comprising: a first body member connected to the maxilla; a second body member connected to the maxilla opposite the first body member; a distance adjustment member having a first threaded portion and a second threaded portion on both sides of a main body member that are screwed into the first body body and the second body body; and an anti-rotation member having elastic protrusions protruding toward the main body member that are inserted into anti-rotation grooves provided along both side edges of the main body member to prevent unintentional rotation of the distance adjustment member, the anti-rotation plates being provided on both sides of the main body member.

[0020] The present invention provides a maxillary skeletal expansion system including a maxillary skeletal expansion device and a tool for rotating a spacing adjustment member of the maxillary skeletal expansion device to expand the first body member and the second body member in an expansion direction so as to move away from each other.

[0021] The tool further comprises a handle portion and a hinge member on one side of the handle portion. of The tool portion includes a support portion connected to an assembly end portion, an extension portion extending from the support portion, and an insertion portion provided at the tip of the extension portion and connected to a main body portion having an angular structure provided on the spacing adjustment member.

[0022] Further, a first assembly part into which the support part is inserted and a second assembly part into which the extension part is inserted while communicating with the first assembly part are provided on one side of the assembly end part, and the second assembly part limits rotation of the extension part.

[0023] In addition, the second assembly part includes a first locking portion and a second locking portion, and the extension part is limited in rotation to 60 degrees by the first locking portion and the second locking portion.

[0024] The hinge member further includes a head portion having a receiving portion provided therein, and a hinge shaft extending from the receiving portion and having an assembly groove on the outer periphery of a tip end thereof.

[0025] In addition, an elastic body that contacts the support part is inserted into the accommodating part, and the tip of the hinge shaft is coupled by passing through the elastic body, the support part and the assembly end part in sequence, and a retaining ring is coupled to the assembly groove. Effect of the Invention

[0026] The present invention has the advantage that by forming unthreaded portions at the ends of the first and second threaded portions to limit the expansion of the first and second body bodies, it is possible to prevent the first and second body bodies from expanding beyond their maximum expansion range, causing the first and second threaded portions to separate and be dismantled.

[0027] In addition, the present invention has the advantage of preventing unintended rotation of the spacing adjustment member by providing an anti-rotation member on the anti-rotation plate and inserting the elastic protrusion of the anti-rotation member into the anti-rotation groove of the main body.

[0028] Furthermore, the present invention has the effect of improving the fixing force when implanted into the maxilla by implanting the first and second fixing members in a direction intersecting the expansion direction close to the center of the maxilla, penetrating both sides of the first body and both sides of the second body, and implanting them into the maxilla at an angle such that they move away from each other as they approach the lower end.

[0029] In addition, the present invention has the advantage that a dedicated tool optimized for the maxillary skeletal expansion device can be used, allowing the patient to easily, accurately and stably rotate the spacing adjustment member by the desired number of clicks. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention. [Diagram 2] FIG. 1 is an exploded perspective view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing an anti-rotation plate according to a preferred embodiment of the present invention. [Figure 4] FIG. 1 is a plan view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention, showing the state before expansion. [Diagram 5] FIG. 1 is a plan view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention, showing an expanded state. [Figure 6] FIG. 2 is a bottom view of a maxillary skeletal expansion device showing an assembled state of an anti-rotation plate according to a preferred embodiment of the present invention. [Figure 7] 1 is a side view showing a state in which a first fixing member and a second fixing member are through-coupled to both ends of a first body according to a preferred embodiment of the present invention. FIG. [Figure 8] FIG. 2 is a diagram showing a state in which a maxillary skeletal expansion device according to a preferred embodiment of the present invention is connected to a maxillary bone. [Figure 9] 13A and 13B are diagrams showing a special tool for rotating the distance adjustment member according to a preferred embodiment of the present invention. [Figure 10] 11A to 11C are diagrams illustrating the operation of a tool portion of a special tool according to a preferred embodiment of the present invention. [Figure 11] 11A to 11C are diagrams illustrating a rotation process of the distance adjusting member using a special tool according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, when attaching reference numerals to components in each drawing, it should be noted that the same components are given the same numerals as much as possible even when they are shown in different drawings. In addition, in the description of the present invention, if it is determined that a detailed description of related known configurations or functions may obscure the gist of the present invention, the detailed description thereof will be omitted. Furthermore, although preferred embodiments of the present invention will be described below, the technical idea of ​​the present invention is not limited or restricted thereto, and may be modified and variously implemented by those skilled in the art.

[0032] FIG. 1 is an oblique view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention, FIG. 2 is an exploded oblique view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention, and FIG. 3 is a diagram showing an anti-rotation plate according to a preferred embodiment of the present invention.

[0033] As shown in Figures 1 to 3, the present invention includes a first body member 10 and a second body member 20 which are connected to the maxillary bone M, a main body portion 31 having a first screw portion 32 and a second screw portion 33 on both sides thereof, the first screw portion 32 being screwed into the first body member 10, and the second screw portion 33 being screwed into the second body member 20, and a distance adjustment member 30 and an anti-rotation plate 41 having an anti-rotation member 42 facing the main body portion 31.

[0034] As an example, the anti-rotation plate 41 having the anti-rotation member 42 may be provided on one side or both sides of the main body portion 31, and the anti-rotation groove 311 into which the elastic protrusion 422 of the anti-rotation member 42 is inserted may be provided on one side or both sides of the main body portion 31.

[0035] The first body section 10 can be connected to the maxillary bone M by a pair of first and second fixing members 61 and 62 that penetrate both ends.

[0036] The second body section 20 can be connected to the maxillary bone M by a pair of first and second fixing members 61 and 62 that face the first body section 10 and penetrate both ends.

[0037] The main body portion 31 may be configured with an angular structure. For example, the main body portion 31 may be configured with an angular structure such as a hexagon that can be engaged with the tool 100. Anti-rotation grooves 311 may be provided along one side edge of the main body portion 31 toward the second screw portion 33. For example, the anti-rotation grooves 311 may be provided at 60 degree intervals.

[0038] An unthreaded portion 34 may be formed at the tip of the first threaded portion 32 and the tip of the second threaded portion 33 .

[0039] When the distance adjustment member 30 is rotated, the first body member 10 moves in the expansion direction D1 along the threads of the first threaded portion 32, and the unthreaded portion 34 is released from the first threaded portion 32, resulting in a state in which the first body member 10 cannot move in the expansion direction D1 and cannot expand any further. Even if the distance adjustment member 30 is rotated further in this state, the first threaded portion 32 will just spin freely with the unthreaded portion 34 inserted into the first body member 10.

[0040] When the distance adjustment member 30 is rotated, the second body member 20 moves in the expansion direction D1 along the threads of the second threaded portion 33, similar to the first body member 10, and the unthreaded portion 34 is released from the second threaded portion 33, resulting in a state in which it cannot move in the expansion direction D1 and cannot expand any further. Even if the distance adjustment member 30 is rotated further in this state, the second threaded portion 33 will just spin idly with the unthreaded portion 34 inserted into the second body member 20.

[0041] It is preferable that the first threaded portion 32 and the second threaded portion 33 are configured with different threads so that the first body member 10 and the second body member 20 can be moved in the expansion direction D1.

[0042] For example, when the first threaded portion 32 is a right-handed thread, the second threaded portion 33 is preferably configured as a left-handed thread, and when the first threaded portion 32 is a left-handed thread, the second threaded portion 33 is preferably configured as a right-handed thread.

[0043] FIG. 4 is a plan view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention, showing the state before expansion, and FIG. 5 is a plan view of a maxillary skeletal expansion device according to a preferred embodiment of the present invention, showing the expanded state.

[0044] As shown in FIGS. 4 and 5, a first coupling portion 35 is provided between the body portion 31 and the second screw portion 33 of the distance adjusting member 30, and a rotation prevention plate 41 is coupled to the first coupling portion 35.

[0045] The anti-rotation plate 41 includes an anti-rotation member 42. The anti-rotation member 42 may be provided on one surface of the anti-rotation plate 41 facing the anti-rotation groove 311 of the main body 31.

[0046] The anti-rotation plate 41 stably supports the anti-rotation member 42, and in addition, can simultaneously function as a spacer that allows the first guide pin 81 and the second guide pin 82 to maintain a constant distance therebetween.

[0047] For example, the anti-rotation member 42 may be formed integrally with the anti-rotation plate 41, or may be formed with a structure that allows it to be detachably attached to the anti-rotation plate 41.

[0048] Because the width between the first guide pin 81 and the second guide pin 82 is greater than the width of the anti-rotation member 42, the anti-rotation member 42 cannot be directly coupled to the first guide pin 81 and the second guide pin 82. To solve this problem, the anti-rotation member 42 is integrally formed on one side of the anti-rotation plate 41, and the anti-rotation plate 41, which is larger than the anti-rotation member 42, is coupled to be positioned between the first guide pin 81 and the second guide pin 82.

[0049] The anti-rotation member 42 has an elastic protrusion 422. The elastic protrusion 422 is formed to protrude toward the body part 31. The elastic protrusion 422 is inserted into the anti-rotation groove 311 of the body part 31, and can prevent the distance adjusting member 30 from rotating unintentionally.

[0050] The anti-rotation plate 41 has an assembly space 411. The assembly space 411 is coupled to the first coupling part 35. When assembled, the anti-rotation plate 41 is assembled so that the assembly space 411 encloses the first coupling part 35 and both side ends 43 are inserted into coupling grooves 83 provided on the opposing surfaces of the first guide pin 81 and the second guide pin 82.

[0051] For example, the assembly space 411 of the anti-rotation plate 41 may be configured in a shape like an "∩" with an open bottom. The first coupling part 35 may be inserted into the assembly space 411 through the bottom of the assembly space 411 to be assembled.

[0052] It is preferable that the width of the inner wall surfaces 411a on both sides of the assembly space 411 is formed to be sufficient so that the outer periphery does not come into contact with the angular surface 351 of the first coupling part 35 when the first coupling part 35 rotates.

[0053] The anti-rotation member 42 has a coupling space 421 that corresponds to the assembly space 411 of the anti-rotation plate 41. It is preferable that the elastic protrusion 422 of the anti-rotation member 42 is located in the center of the coupling hole 421 so as to coincide with the position of the anti-rotation groove 311 of the body 31.

[0054] It is preferable that an outer surface 422 a of the elastic protrusion 422 of the anti-rotation member 42 is formed in a shape that matches the anti-rotation groove 311 so that it can be inserted into the anti-rotation groove 311 .

[0055] For example, the elastic protrusion 422 may be configured in a semicircular shape that is convex toward the main body 31 by bending the tip inwardly so as to have elasticity.

[0056] When a force larger than the supporting force of the elastic protrusions 422 acts on the distance adjustment member 30, the supporting force of the elastic protrusions 422 is overcome and the distance adjustment member 30 can rotate.

[0057] Rotation of the spacing adjustment member 30 causes the main body 31 to rotate, and as the main body 31 rotates, the elastic protrusion 422 inserted into the anti-rotation groove 311 of the main body 31 can be inserted into another anti-rotation groove 311 provided on the main body 31.

[0058] Figure 6 is a bottom view of a maxilla skeletal expansion device showing the assembled state of an anti-rotation plate according to a preferred embodiment of the present invention, Figure 7 is a side view showing a state in which a first fixing member and a second fixing member are penetratingly connected to both ends of a first body according to a preferred embodiment of the present invention, and Figure 8 is a diagram showing a state in which a maxilla skeletal expansion device according to a preferred embodiment of the present invention is connected to a maxilla.

[0059] As shown in Figures 6 to 8, a pair of first and second fixing members 61 and 62 can be implanted in the maxillary bone M in a cross direction D2 that crosses the expansion direction D1, penetrating both sides of the first body member 10 or both sides of the second body member 20, and can be implanted at an angle such that they move away from each other as they approach the lower end.

[0060] For example, the first fixing member 61 and the second fixing member 62 may be fixing screws (Miniscrews) that can be implanted in the maxillary bone M.

[0061] Since the bone of the maxilla M is weaker and thinner than the bones of other parts of the body, the fixing position and direction of the first fixing member 61 and the second fixing member 62 are very important in maintaining the fixing force of the first fixing member 61 and the second fixing member 62.

[0062] Due to its structure, the bone thickness of the maxilla M is thickest near the central part of the maxilla M (the midpalatal suture) and becomes rapidly thinner as it moves away from the central part of the maxilla M, i.e., in the expansion direction D1.Therefore, in order to maximize the fixing force of the first fixing member 61 and the second fixing member 62, it is preferable to fix the first fixing member 61 and the second fixing member 62 at a position close to the central part of the maxilla M.

[0063] Therefore, implanting the first fixing member 61 and the second fixing member 62 on the intersecting direction D2 line close to the center of the maxilla M can increase the fixation strength, and in addition, implanting the first fixing member 61 and the second fixing member 62 at an incline with the central axis C so that they move away from each other as they approach the tip can increase the fixation strength compared to when they are implanted vertically.

[0064] A pair of first and second guide members 71 and 72 may be attached to both sides of the first body member 10. The first and second guide members 71 and 72 have a symmetrical structure. A first and second guide member 71 and 72 may be attached to both sides of the second body member 20.

[0065] The first guide member 71 may have a first through hole 711 through which the first fixing member 61 is penetrated and coupled. The second guide member 72 may have a second through hole 721 through which the second fixing member 62 is penetrated and coupled.

[0066] The first through hole 711 and the second through hole 721 may be configured as inclined holes that guide the first fixing member 61 and the second fixing member 62 to be inclinedly installed.

[0067] A first guide pin 81 and a second guide pin 82 may be coupled to the first body member 10 and the second body member 20 so as to penetrate side surfaces of the first body member 10 and the second body member 20. For example, the first guide pin 81 and the second guide pin 82 may be configured in the form of a round bar.

[0068] The first body member 10 and the second body member 20 can stably move in the expansion direction D1 along the first guide pin 81 and the second guide pin 82.

[0069] An arm 90 may be coupled to the outer surface of the first body member 10 and the second body member 20. The arm 90 is located between the first guide pin 81 and the second guide pin 82. The arm 90 may be coupled to a tooth coupling member 91 that is fixed to a tooth T of the maxillary bone M. For example, the tooth coupling member 91 may be a band that can be fixed to the tooth T of the maxillary bone M.

[0070] The arm 90 may be formed to have a smaller outer diameter than the first guide pin 81 and the second guide pin 82 .

[0071] A second coupling portion can be provided between the main body portion 31 and the first screw portion 32 of the distance adjustment member 30. A support plate 52 opposing the anti-rotation plate 41 can be assembled to the second coupling portion .

[0072] The support plate 52 , together with the anti-rotation plate 41 , may function as a spacer for maintaining the distance between the first guide pin 81 and the second guide pin 82 .

[0073] The support plate 52 may have an assembly space 521 like the anti-rotation plate 41. The assembly space 521 of the support plate 52 is assembled to enclose the second coupling portion .

[0074] Both ends of the support plate 52 may be coupled to coupling grooves 83 provided in a first guide pin 81 and a second guide pin 82 like the anti-rotation plate 41 .

[0075] FIG. 9 is a diagram showing a special tool for rotating a distance adjustment member according to a preferred embodiment of the present invention, FIG. 10 is a diagram showing the operation of a tool portion of the special tool according to a preferred embodiment of the present invention, and FIG. 11 is a diagram showing the rotation process of the distance adjustment member by the special tool according to a preferred embodiment of the present invention.

[0076] As shown in Figures 9 to 11, the maxillary skeletal expansion system of the present invention includes a maxillary skeletal expansion device and a tool 100 for rotating the spacing adjustment member 30 of the maxillary skeletal expansion device to expand the first body member 10 and the second body member 20 in an expansion direction D1 so that they move away from each other.

[0077] The tool 100 includes a handle portion 110 and a tool portion 120 connected to the handle portion 110 by a hinge member 130. The tool portion 120 includes a support portion 121, an extension portion 122 extending from the support portion 121, and an insertion portion 123 provided at the tip of the extension portion 122.

[0078] The support portion 121 is disposed on one side of the handle portion 110. of It is coupled to the assembly end portion 111. On one surface of the assembly end portion 111, a first assembly portion 111a and a second assembly portion 111b communicating with the first assembly portion 111a are provided.

[0079] The support part 121 is inserted into the first assembly part 111a. The support part 121 is preferably formed in a circular shape that matches the first assembly part 111a so that it can rotate smoothly. The first assembly part 111a can provide a space in which the support part 121 can operate.

[0080] The extension portion 122 is inserted into the second assembly portion 111b. The second assembly portion 111b can limit the rotation of the extension portion 122.

[0081] The second assembly part 111b includes a first locking part 111c and a second locking part 111d. The extension part 122 may be limited in rotation to 60 degrees by the first locking part 111c and the second locking part 111d.

[0082] The hinge member 130 includes a head portion 131 having a receiving portion 131a therein, and a hinge shaft 132 extending from the receiving portion 131a. An assembly groove 132a is formed on the outer periphery of the tip of the hinge shaft 132.

[0083] An elastic body 140 may be inserted into the receiving portion 131a of the head portion 131. The elastic body 140 elastically adheres to the support part 121 in an assembled state, thereby preventing the assembly of the support part 121 from coming loose.

[0084] For example, the elastic body 140 may be any material that can elastically and closely support the support portion 121, including a spring.

[0085] The elastic body 140 prevents the assembly structure of the tool part 120 from loosening due to frequent use of the tool 100 and ensures that the rotational force of the tool part 120 is always smoothly transmitted to the body part 31 of the gap adjusting member 30 .

[0086] The tip of the hinge shaft 132 is coupled to pass through the elastic body 140, the support part 121, and the assembly end part 111 in that order. A stop ring 150 is coupled to the assembly groove 132a of the hinge shaft 132 that is exposed by being coupled to the assembly end part 111, so that the hinge shaft 132 is not separated from the assembly end part 111.

[0087] In the tool 100 of the present invention, the tool unit 120, which transmits a rotational force to the distance adjustment member 30, rotates precisely at a set angle, i.e., 60 degrees per click, so that even if the patient rotates the distance adjustment member 30 himself, the distance adjustment member 30 can be rotated the correct number of clicks. As a result, the patient can use the tool 100 to rotate the distance adjustment member 30 the desired number of clicks to expand the first body member 10 and the second body member 20 without any psychological anxiety.

[0088] Next, the expansion process of the maxillary skeletal expansion device will be explained.

[0089] As shown in FIG. 8, a first fixing member 61 and a second fixing member 62 are implanted in the maxilla M so as to penetrate the first body 10 and the second body 20, and the maxilla skeletal expansion device is connected to the maxilla M.

[0090] With the maxillary skeletal expansion device connected to the maxillary bone M, the tooth connecting member 91 is fixed to a tooth T such as a molar.

[0091] A patient who has had a maxillary skeletal expansion device applied to the maxilla M at a dental clinic or other facility uses the tool 100 as instructed by the clinic to periodically expand the maxillary skeletal expansion device by the number of clicks determined by the patient. If necessary, the maxillary skeletal expansion device can be expanded while measuring the expansion length between the first body 10 and the second body 20 with a gauge (not shown).

[0092] With the extension portion 122 of the tool 100 in close contact with the first locking portion 111c as shown in FIG. 11(a), the insertion portion 123 is coupled to the main body portion 31 of the distance adjusting member 30 as shown in FIG. 11(b).

[0093] With the insertion portion 123 of the tool portion 120 connected to the main body portion 31 of the spacing adjustment member 30, when the handle portion 110 is pulled as shown in (c) of Figure 11, the extension portion 122 of the tool portion 120, which was in close contact with the first engagement portion 111c, rotates around the support portion 121 and engages with the second engagement portion 111d.

[0094] As the tool part 120 rotates from the first locking part 111c to the second locking part 111d in this manner, the rotational force of the tool part 120 can be transmitted to the body part 31 of the distance adjusting member 30 via the insertion part 123.

[0095] For example, since the rotation of the tool part 120 is limited to only rotate 60 degrees per click, the distance adjustment member 30 can rotate once when the tool part 120 is rotated 6 clicks.

[0096] In this manner, by rotating the distance adjusting member 30 using the tool 100, the first body member 10 and the second body member 20 can be expanded in the expansion direction D1.

[0097] When the distance adjustment member 30 is rotated, the first body member 10 moves along the first threaded portion 32 and the unthreaded portion 34 is released from the first threaded portion 32, resulting in a state where further expansion is not possible. In this state, even if the distance adjustment member 30 is rotated further, the first threaded portion 32 will simply spin freely with the unthreaded portion 34 inserted into the first body member 10.

[0098] When the distance adjustment member 30 is rotated, the second body member 20 moves along the second threaded portion 33 in the same manner as the first body member 10, and the unthreaded portion 34 is released from the threaded state with the second threaded portion 33, resulting in a state where no further expansion is possible. In this state, even if the distance adjustment member 30 is rotated further, the second threaded portion 33 will just spin idly with the unthreaded portion 34 inserted into the second body member 20.

[0099] In this way, the unthreaded portion 34 prevents the first body 10 and the second body 20 from expanding beyond the maximum expansion range, which prevents the first body 10 and the second body 20 from continuing to expand and becoming detached from the first threaded portion 32 and the second threaded portion 33, as in the conventional case, and thus prevents disassembly. This allows the patient to expand the maxillary skeletal expansion device with peace of mind.

[0100] As can be seen, the present invention forms unthreaded portions at the ends of the first and second threaded portions to limit the expansion of the first and second body bodies, thereby preventing the first and second body bodies from expanding beyond their maximum expansion range, which would cause the first and second threaded portions to come off and be dismantled.

[0101] In addition, the present invention can prevent unintentional rotation of the spacing adjustment member by providing an anti-rotation member on the anti-rotation plate and inserting the elastic protrusion of the anti-rotation member into the anti-rotation groove of the main body.

[0102] Furthermore, the present invention improves the fixing force when implanted into the maxilla by implanting the first and second fixing members in a direction intersecting the expansion direction close to the center of the maxilla, penetrating both sides of the first body and both sides of the second body, and implanting them in the maxilla at an angle that moves away from each other toward the lower end.

[0103] In addition, the present invention uses a dedicated tool optimized for the maxillary skeletal expansion device, allowing the patient to rotate the spacing adjustment member by the desired number of clicks easily, accurately and stably.

[0104] The above description is merely an illustrative example of the technical concept of the present invention, and various modifications, changes and substitutions may be made by those having ordinary skill in the art to which the present invention pertains without departing from the essential characteristics of the present invention. Therefore, the embodiments and the attached drawings disclosed in the present invention are intended to explain the present invention and are not intended to limit the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by such embodiments and the attached drawings. The scope of protection of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0105] 10: 1st body 20: 2nd body 30: Distance adjustment member 35: First connecting portion 36: Second joint 41: Anti-rotation plate 42: Anti-rotation member 52: Support plate 61: First fixing member 62: Second fixing member 71: First guide member 72: Second guide member 81: First guide pin 82: Second guide pin 90: Arm 91: Tooth connecting member 100: Tools

Claims

1. a first body member coupled to the maxilla; a second body member coupled to the maxillary bone opposite the first body member; a gap adjusting member having a first threaded portion and a second threaded portion on both sides of a main body that are screwed into the first body and the second body; a rotation prevention plate including a rotation prevention member having an elastic protrusion protruding toward the main body and inserted into a rotation prevention groove provided along one side edge of the main body to prevent unintentional rotation of the distance adjustment member; a first guide pin and a second guide pin coupled to the first body and the second body so as to penetrate through side surfaces of the first body and the second body, A rotation prevention member is attached to one side of the rotation prevention plate, The anti-rotation member has an ∩-shaped assembly space, The first body member and the second body member are movable along the first guide pin and the second guide pin, the anti-rotation plate is assembled such that an assembly space provided on one surface thereof encloses a first coupling portion provided between the body portion and the second screw portion, and both ends of the anti-rotation plate are inserted into coupling grooves provided on the first guide pin and the second guide pin, The anti-rotation member has a coupling space corresponding to an assembly space of the anti-rotation plate, and the coupling space is assembled to enclose the first coupling portion, The first body or the second body is connected to the maxillary bone by a pair of a first fixing member and a second fixing member, A pair of first and second guide members are coupled to both sides of the first body or both sides of the second body, The first guide member has a first through hole through which the first fixing member is inserted and the second guide member has a second through hole through which the second fixing member is inserted and The first and second fixation members are implanted in a direction intersecting the expansion direction so as to approach a central portion of the maxilla, penetrating both sides of the first body or both sides of the second body, and implanted in the maxilla at an angle such that the distance between them increases as they approach the lower end, the first through holes and the second through holes being inclined holes that guide the oblique implantation of the first and second fixation members.

2. The outer surface of the elastic protrusion is The maxillary skeletal expansion device according to claim 1 , which is formed in a semicircular shape that matches the anti-rotation groove so that it can be inserted into the anti-rotation groove.

3. The maxillary skeletal expansion device according to claim 1 , wherein a non-threaded portion is provided at a tip of the first threaded portion and a tip of the second threaded portion.

4. 2. The maxillary skeletal expansion device of claim 1, wherein an arm is connected to an outer side surface of the first body member and an outer side surface of the second body member, and the arm is connected to a tooth connecting member that is fixed to a tooth of the maxillary bone while being positioned between the first guide pin and the second guide pin.

5. 2. The maxillary skeletal expansion device of claim 1, wherein a second coupling portion is provided between the main body portion and the first screw portion, a support plate is provided opposite the anti-rotation plate, the support plate has an assembly space, and the assembly space of the support plate is assembled to enclose the second coupling portion while both side ends are inserted into the coupling grooves of the first guide pin and the second guide pin.

6. a first body member coupled to the maxilla; a second body member coupled to the maxillary bone opposite the first body member; a gap adjusting member having a first threaded portion and a second threaded portion on both sides of a main body that are screwed into the first body and the second body; The anti-rotation member includes an elastic protrusion protruding toward the main body, which is inserted into an anti-rotation groove provided along both side edges of the main body, and which prevents the gap adjustment member from rotating unintentionally, and the anti-rotation plate is provided on both sides of the main body; a first guide pin and a second guide pin coupled to the first body and the second body so as to penetrate through side surfaces of the first body and the second body, A rotation prevention member is attached to one side of the rotation prevention plate, The anti-rotation member has an ∩-shaped assembly space, The first body member and the second body member are movable along the first guide pin and the second guide pin, the anti-rotation plate is assembled such that an assembly space provided on one surface thereof encloses a first coupling portion provided between the body portion and the second screw portion, and both ends of the anti-rotation plate are inserted into coupling grooves provided on the first guide pin and the second guide pin, The anti-rotation member has a coupling space corresponding to an assembly space of the anti-rotation plate, and the coupling space is assembled to enclose the first coupling portion, The first body or the second body is connected to the maxillary bone by a pair of a first fixing member and a second fixing member, A pair of first and second guide members are coupled to both sides of the first body or both sides of the second body, The first guide member has a first through hole through which the first fixing member is inserted and the second guide member has a second through hole through which the second fixing member is inserted and The first and second fixation members are implanted in a direction intersecting the expansion direction so as to approach a central portion of the maxilla, penetrating both sides of the first body or both sides of the second body, and implanted in the maxilla at an angle such that the distance between them increases as they approach the lower end, the first through holes and the second through holes being inclined holes that guide the oblique implantation of the first and second fixation members.

7. A maxillary skeletal expansion device according to any one of claims 1 to 6, a tool for rotating the spacing adjustment member of the maxillary bone skeletal expansion device to expand the first body and the second body in an expansion direction so as to move them away from each other; a first guide pin and a second guide pin coupled to the first body and the second body so as to penetrate through side surfaces of the first body and the second body, The first body member and the second body member are movable along the first guide pin and the second guide pin, the anti-rotation plate is assembled such that an assembly space provided on one surface thereof encloses a first coupling portion provided between the body portion and the second screw portion, and both ends of the anti-rotation plate are inserted into coupling grooves provided on the first guide pin and the second guide pin, The anti-rotation member has a coupling space corresponding to an assembly space of the anti-rotation plate, and the coupling space is assembled to enclose the first coupling portion, A rotation prevention member is attached to one side of the rotation prevention plate, The anti-rotation member has an ∩-shaped assembly space, The first body or the second body is connected to the maxillary bone by a pair of a first fixing member and a second fixing member, A pair of first and second guide members are coupled to both sides of the first body or both sides of the second body, The first guide member has a first through hole through which the first fixing member is inserted and the second guide member has a second through hole through which the second fixing member is inserted and The first through hole and the second through hole are configured as an inclined hole that guides the inclined implantation of the first fixation member and the second fixation member so that the first fixation member and the second fixation member can be implanted in a direction intersecting the expansion direction so as to approach a central portion of the maxilla, penetrating both sides of the first body or both sides of the second body, and implanted in the maxilla at an angle such that the distance between them increases as they approach the lower end.

8. The tool comprises: A handle part and a tool part including a support part connected to one assembly end of the handle part by a hinge member, an extension part extending from the support part, and an insertion part provided at a tip of the extension part and connected to a main body part having a square structure provided on the distance adjustment member; The maxillary skeletal expansion system according to claim 7, comprising:

9. The maxillary skeletal expansion system of claim 8, further comprising a first assembly part into which the support part is inserted on one side of the assembly end, and a second assembly part into which the extension part is inserted while communicating with the first assembly part, the second assembly part limiting the rotation of the extension part.

10. The maxillary skeletal expansion system of claim 9, wherein the second assembly portion includes a first stop and a second stop, and the extension portion is limited in rotation to 60 degrees by the first stop and the second stop.

11. The hinge member is A head portion having a storage portion provided therein; A hinge shaft extending from the housing portion and having an assembly groove on the outer periphery of a tip end thereof; The maxillary skeletal expansion system according to claim 9, comprising:

12. The maxillary skeletal expansion system according to claim 11, wherein an elastic body that contacts the support portion is inserted into the receiving portion, the tip of the hinge axis is coupled by passing through the elastic body, the support portion and the assembly end portion in sequence, and a retaining ring is coupled to the assembly groove.

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