A molar distalization expander

Abstract

This utility model relates to a molar distalization expander, comprising: two support bodies, each with a threaded hole extending through its center; and two fixing rods, fixedly connected to the left and right sides of one of the support bodies for fixing the support body to the maxilla. This utility model relates to the technical field of medical devices. This molar distalization expander, with two support bodies, each connected to a fixing rod and a support rod, allows for separate installation. A positive and negative screw is threaded between the two support bodies, allowing the two support bodies to move closer or further apart by rotating the screws, thus adjusting the arch length of the expander and broadening its applicability, thereby effectively improving its practicality.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and in particular to a molar distalization expander. Background Technology

[0002] With the improvement of socioeconomic level and the enhancement of health awareness, people's demand for oral aesthetics and health is increasing. A neat and harmonious dental arch shape is not only the foundation of occlusal function, but also an important component of facial aesthetics.

[0003] However, insufficient dental arch length is a common problem in clinical practice, often leading to insufficient space for tooth alignment and causing malocclusions such as crowding, protrusion, or reverse overbite, which seriously affect patients' oral health and self-confidence. To address these issues, dental arch expansion technology has become one of the core methods of orthodontic treatment, and the spiral arch expander, due to its efficient and controllable mechanical properties, has become a key instrument for achieving dental arch expansion.

[0004] Traditional spiral expanders typically employ a design combining mechanical screws and metal supports. A typical structure includes four metal support rods, welded to a band, which is then fixed to the patient's molars or premolars. Rotating the screws drives the support structure to expand laterally, transmitting mechanical force to the alveolar bone or mid-palatal suture, thus promoting lateral expansion of the dental arch. However, this design has limitations: it is suitable for cases where the dental arch width is insufficient, but ineffective for cases where the dental arch length is insufficient. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a molar distalization expander in order to solve the technical problems mentioned in the background art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A molar distalization expander, comprising:

[0008] The support body consists of two parts, each with a threaded hole extending through its center.

[0009] There are two fixing rods, which are fixedly connected to the left and right sides of one of the support bodies. The ends of the fixing rods are provided with fixing holes for fixing the support body to the maxilla.

[0010] There are two support rods, which are fixedly connected to the left and right sides of the side wall of another support body away from the fixed rod, and are used to promote the movement of the molar in the distal direction;

[0011] The positive and negative screws are positioned between the two support bodies, with their two ends threaded into two threaded holes respectively.

[0012] Furthermore, a boss is fixedly connected to the middle of the positive and negative screws, and two through holes are opened on the surface of the boss, with the axes of the two through holes perpendicular to each other.

[0013] Furthermore, the bracket body has guide holes on both sides of the threaded hole, and guide rods are slidably connected in the guide holes.

[0014] Furthermore, a groove is formed in the middle of the guide rod, and the groove contains the boss.

[0015] Furthermore, it also includes a pressure plate for preventing the positive and negative screws from loosening. The pressure plate is mainly composed of a straight section, and both sides of the straight section are curved to form arc-shaped sections. The two arc-shaped sections are respectively enclosed in two grooves. The surface of the boss is provided with a plane that abuts against the straight section at the position between two adjacent through holes.

[0016] In summary, this utility model has at least one of the following beneficial technical effects:

[0017] 1. This molar distalization expander has two support bodies, each connected to a fixed rod and a support rod, allowing the molar distalization expander to be set up separately. A positive and negative screw is threaded between the two support bodies, allowing the two support bodies to move closer or further apart by rotating the screw, thus adjusting the arch length of the molar distalization expander. This broadens the applicability of the molar distalization expander and effectively improves its practicality.

[0018] 2. This molar distalization expander, by setting a guide rod between two support bodies, allows the support bodies to move only along the axial direction when the forward and reverse screws are turned, making the adjustment of the molar distalization expander more stable. Furthermore, by setting a groove in the middle of the guide rod, the boss can provide support for the side wall of the groove, thereby limiting the guide rod and effectively preventing the guide rod from shaking, thus improving the comfort of the molar distalization expander.

[0019] 3. This molar distalization expander features a pressure plate with four flat surfaces on a boss. The pressure plate presses against the flat surfaces of the forward and reverse screws. Because the arc portion of the boss is higher than the flat surfaces, a certain force is required to push the pressure plate up a certain distance (pressure plate deformation) before the forward and reverse screws can rotate smoothly. The deformation of the pressure plate is very small. When it rotates to the boss flat surface position, the pressure plate returns to its original shape and presses against the boss flat surface again. A certain force is required to rotate it again. However, the force from the mouth and tongue movements is insufficient to rotate the screws. Therefore, this design can effectively prevent the screws from rotating and provides an anti-loosening effect by ensuring the fit between the flat surfaces and the pressure plate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a molar distalization expander according to the present invention.

[0022] Figure 2 This is a front view of a molar distalization expander according to the present invention.

[0023] Figure 3 This is a schematic diagram showing the usage of a molar distalization expander according to this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of a molar distalization expander after use according to this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the pressure plate and boss of a molar distalization expander according to the present invention.

[0026] In the diagram, 1. Support body; 2. Fixing rod; 3. Support rod; 4. Positive and negative screws; 5. Threaded hole; 6. Boss; 7. Through hole; 8. Guide hole; 9. Guide rod; 10. Groove; 11. Fixing hole; 12. Pressure plate; 121. Straight section; 122. Arc section; 13. Plane. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example:

[0029] Reference Figure 1 - Figure 5 The present invention discloses a molar distalization expander, comprising:

[0030] There are two support bodies 1, and each of the two support bodies 1 has a threaded hole 5 through the middle.

[0031] There are two fixing rods 2, which are fixedly connected to the left and right sides of one of the support bodies 1. The ends of the fixing rods 2 are provided with fixing holes 11 for fixing the support body 1 to the maxilla.

[0032] The support rod 3 is provided in two parts. The two support rods 3 are fixedly connected to the left and right sides of the side wall of another support body 1 away from the fixed rod 2, and are used to promote the molar to move in the distal direction.

[0033] The positive and negative screws 4 are set between the two support bodies 1, and the two ends of the positive and negative screws 4 are respectively threaded to the two threaded holes 5.

[0034] In this embodiment, observation Figure 1 It can be observed that by setting up a support body 1, and connecting fixing rods 2 to the top left and right sides of the support body 1, fixing holes 11 are opened at the ends of the fixing rods 2, so that the bow expander can be used as follows: Figure 3 As shown in the diagram, the expander is fixed to the maxilla using a fixing screw passing through the hole, making the installation of the molar distalization expander more stable. Subsequently, support rods 3 are fixedly connected to the left and right sides of the bottom of the support body 1. By bending the support rods 3 into a suitable dental arch shape, force can be transmitted to the teeth and alveolar bone. By fixing a ring to the end of the support rod 3 away from the support body 1, the support rod 3 can stably transmit force to the teeth and alveolar bone through the ring after the molar distalization expander is installed, thereby ensuring the practicality of the molar distalization expander and promoting the distalization of the molars.

[0035] Traditional spiral expanders typically employ a design combining mechanical screws and metal supports. Their typical structure includes four metal support rods, welded to a band, which is then fixed to the patient's molars or premolars. Rotating the screws drives the support structure to expand laterally, transmitting mechanical force to the alveolar bone or mid-palatal suture, thus promoting lateral expansion of the dental arch. However, this design has limitations: it is suitable for cases where the dental arch width is insufficient, but ineffective for cases where the dental arch length is insufficient.

[0036] Therefore, observe Figure 1 It can be seen that by setting two support bodies 1, each of which has a threaded hole 5 through the middle, and the two support bodies 1 are connected by positive and negative screws 4, rotating the positive and negative screws 4 can make the two support bodies 1 move closer or further apart, so as to realize the adjustment of the dental arch length of the molar distalization expander.

[0037] At this point, the molar distalization expander can be used as follows: Figure 3 As shown in the diagram, the expander is fixed to the patient's maxilla to achieve the function of dental arch expansion. With continued use, under the mechanical force of the support rod 3, the patient's teeth will gradually move distally. During this movement, to ensure that the support rod 3 applies a stable mechanical force to the teeth, the expander can be adjusted by rotating the forward and reverse screws 4 to achieve the desired expansion function. Figure 4 The elongation shown in the figure can effectively improve the practicality of the bow expander.

[0038] Subsequent observation Figure 2It can be observed that, in order for the molar distalization expander to have the function of adjusting the dental arch length, two support bodies 1 are provided. Therefore, in order for the molar distalization expander to be used normally, the top left and right sides of one support body 1 are fixedly connected to the fixing rods 2, and the left and right sides of the side wall of the other support body 1 away from the fixing rods 2 are fixedly connected to the support rods 3, so as to ensure the stability of the molar distalization expander in use.

[0039] In a further preferred embodiment of this application, in order to ensure the connection stability between the fixing rod 2, the support rod 3 and the support body 1, round holes can be machined at both ends of the support body 1. Then, the fixing rod 2 and the support rod 3 are inserted into the round holes and finally welded to the support body 1, which can effectively improve the stability of the molar distalization expander.

[0040] In a further preferred embodiment of this utility model, such as Figure 1 As shown, a boss 6 is fixedly connected to the middle of the positive and negative screws 4. Two through holes 7 are opened on the surface of the boss 6, and the axes of the two through holes 7 are perpendicular to each other.

[0041] In this embodiment, since the dental arch length adjustment of the molar distalization expander is achieved by rotating the positive and negative screws 4 to bring the two support bodies 1 closer to or further apart, the positive and negative screws 4 need to be able to rotate quickly and easily when adjustment is needed to ensure convenient installation of the molar distalization expander.

[0042] Therefore, observe Figure 1 It can be observed that a boss 6 is fixedly connected to the middle of the positive and negative screw 4. Two through holes 7 are opened on the surface of the boss 6. The axes of the two through holes 7 are perpendicular to each other. When it is necessary to adjust the length of the molar distalization expander, it is only necessary to insert a key (or a long and thin object such as a wrench that can be inserted into the through hole 7) into it, and the positive and negative screw 4 can be easily turned, making the adjustment of the molar distalization expander simpler and more convenient, and greatly improving the practicality of the molar distalization expander.

[0043] In a further preferred embodiment of this utility model, such as Figure 1 As shown, the bracket body 1 has guide holes 8 on both sides of the threaded hole 5, and a guide rod 9 is slidably connected in the guide holes 8.

[0044] In this embodiment, since the molar distalization expander is set up in two parts to adjust the length of the dental arch, the two support bodies 1 can be twisted, which will make the molar distalization expander uneven when installed on the maxilla, thus affecting the comfort of the molar distalization expander.

[0045] Therefore, observe Figure 1It can be seen that by providing guide holes 8 on both sides of the threaded hole 5 on the bracket body 1, and sliding guide rods 9 in the guide holes 8, the two guide rods 9 and the positive and negative screws 4 can provide multi-point limiting for the two bracket bodies 1 to avoid twisting between the two bracket bodies 1, so that the molar distal retraction expander remains flat after installation.

[0046] Meanwhile, due to the setting of the guide rod 9, when the forward and reverse screws 4 are turned, the support body 1 will be assisted by the guide rod 9, so that the support body 1 can only move along the axial direction, which can make the adjustment of the molar distalization expander more stable.

[0047] In a further preferred embodiment of this utility model, such as Figure 2 As shown, a groove 10 is provided in the middle of the guide rod 9, and the groove 10 contains the boss 6.

[0048] In this embodiment, since the guide rod 9 is slidably disposed in the guide hole 8, and the support body 1 also needs to slide on the guide rod 9 when it moves, the guide rod 9 is difficult to position and will shake during use, thereby affecting the comfort of the molar distalization expander.

[0049] Therefore, observe Figure 2 It can be seen that by providing a groove 10 in the middle of the guide rod 9, and accommodating the boss 6 in the groove 10, the boss 6 can provide support for the side wall of the groove 10, thereby limiting the guide rod 9 and effectively preventing the guide rod 9 from shaking. This effectively improves the comfort of the molar distalization expander. At the same time, the cooperation between the groove 10 and the boss 6 can also prevent the guide rod 9 from coming out of the guide hole 8, effectively improving the stability of the expander.

[0050] In a further preferred embodiment of this utility model, such as Figure 1 and Figure 5 As shown, it also includes a pressure plate 12, which is mainly composed of a straight section 121. Both sides of the straight section 121 are curved to form an arc section 122. The two arc sections 122 are respectively enclosed in two grooves 10. The surface of the boss 6 is provided with a plane 13 that contacts the straight section 121 at the position between two adjacent through holes 7.

[0051] In this embodiment, since the bow expander is adjusted by rotating the positive and negative screws 4, the movement of the mouth and tongue will apply external force to the positive and negative screws 4, which may cause the positive and negative screws 4 to rotate, resulting in a decrease in the support strength of the bow expander and affecting the use of the bow expander.

[0052] Therefore, observe Figure 5It can be observed that the molar distalization expander also includes a pressure plate 12, which is mainly composed of a straight section 121. Both sides of the straight section 121 are curved to form arc-shaped sections 122. The two arc-shaped sections 122 are respectively enclosed in two grooves 10, and then... Figure 1 As can be seen, the surface of the boss 6 is provided with a plane 13 that contacts the straight section 121 at a position between two adjacent through holes 7.

[0053] At this time, a certain force is required to rotate the positive and negative screw 4 so that the pressure plate 12 can be lifted a certain distance (the pressure plate 12 deforms) so that it can rotate smoothly. The deformation of the pressure plate 12 is very small. When it is rotated 90° to the plane 13 position of the positive and negative screw 4, the deformation of the pressure plate 12 is restored, and the pressure plate 12 is pressed back onto the plane 13 position of the rotating shaft of the positive and negative screw 4. A certain force is required to rotate it again. However, the force of the mouth and tongue is not enough to make the positive and negative screw 4 rotate. Therefore, this solution can effectively prevent the positive and negative screw 4 from loosening and rotating.

[0054] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A molar distalization expander, characterized in that, include: There are two support bodies (1), and threaded holes (5) are opened through the middle of the two support bodies (1); There are two fixing rods (2), which are fixedly connected to the left and right sides of one of the support bodies (1). The ends of the fixing rods (2) are provided with fixing holes (11) for fixing the support body (1) to the maxilla. The support rod (3) is provided in two parts. The two support rods (3) are fixedly connected to the left and right sides of the side wall of another support body (1) away from the fixed rod (2) to promote the molar to move in the distal direction. The positive and negative screws (4) are set between the two support bodies (1), and the two ends of the positive and negative screws (4) are threadedly connected to the two threaded holes (5) respectively.

2. The molar distalization expander according to claim 1, characterized in that, The positive and negative screws (4) are fixedly connected to a boss (6) in the middle. The boss (6) has two through holes (7) on its surface, and the axes of the two through holes (7) are perpendicular to each other.

3. The molar distalization expander according to claim 2, characterized in that, The bracket body (1) has guide holes (8) on both sides of the threaded hole (5), and a guide rod (9) is slidably connected in the guide hole (8).

4. A molar distalization expander according to claim 3, characterized in that, The guide rod (9) has a groove (10) in the middle, and the groove (10) contains the boss (6).

5. A molar distalization expander according to claim 4, characterized in that, It also includes a pressure plate (12) for preventing the positive and negative screws (4) from loosening. The pressure plate (12) is mainly composed of a straight section (121). Both sides of the straight section (121) are curved to form arc sections (122). The two arc sections (122) are respectively enclosed in two grooves (10). The surface of the boss (6) is provided with a plane (13) that abuts against the straight section (121) at the position between two adjacent through holes (7).

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