A retreat prevention type orthodontic expander
By using a flexible stopper to limit rotation in the expander, the problem of easy retraction in traditional expanders is solved, achieving structural simplification and improved stability, thus ensuring the accuracy of orthodontic treatment.
Patent Information
- Application Number
- CN202611129408.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-28
- Publication Date
- 2026-11-06
AI Technical Summary
Traditional bow expanders are prone to rotation and retraction during use, leading to deviations in treatment effectiveness. Furthermore, existing anti-rotation structures are complex and easily damaged.
Flexible anti-reverse components, such as anti-rotation rubber sleeves, are used to limit the reverse rotation of the spacing adjustment components through deformation interference resistance. Combined with the guide components and screw adjustment structure, a stable bow expansion effect is achieved.
It improves the stability of the expander, simplifies the structure, reduces the risk of wear and breakage of mechanical parts, and enhances the precision of orthodontic treatment.
Smart Images
Figure CN123037855A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of medical device technology, specifically, it relates to a regressive orthodontic expander. Background Technology
[0002] An arch expander, also known as a dental arch expander spiral expander, is a traditional expander that typically consists of fixed clasps, a double-curved labial arch base, and other components. Its therapeutic principle involves placing the expander in the appropriate position on the patient's dental arch, rotating the spiral opening to enlarge the expander, and then slowly transmitting corrective force through the base to the teeth and alveolar bone, thereby expanding the width and length of the upper and lower dental arches.
[0003] Clinical application has revealed that after the expander has been used, the central screw can easily rotate in the opposite direction due to the continuous reaction force exerted by the jawbone on the expander or unintentional contact with the expander by the patient's tongue, leading to deviations in the expansion effect. This screw retraction not only slows down the orthodontic process but also causes the loss of the original positional reference point during follow-up appointments, making it difficult for medical staff to accurately determine the required degree and distance of expansion.
[0004] Currently, some expanders with anti-rotation functions have emerged in the industry, typically employing ratchet-pawl structures or locally rigid positioning structures for interference locking. However, orthodontic instruments are inherently small in size, and introducing tiny, complex rigid mechanical components would, on the one hand, complicate the overall structure and increase the difficulty of manufacturing and assembly; on the other hand, under the complex oral physiological environment and long-term alternating stress, these tiny metal parts are prone to wear, jamming, or even breakage. Summary of the Invention
[0005] This invention provides an anti-retraction orthodontic expander, which aims to solve the technical problems of easy rotation and retraction, and the complex rigid mechanical structure of the anti-retraction device, which is prone to jamming.
[0006] To achieve the above objectives, the present invention provides a retractable orthodontic expander, comprising an orthodontic base and a reverse orthodontic base, wherein extension members extend from the outer sides of both the orthodontic base and the reverse orthodontic base opposite to each other, and further comprising: A spacing adjustment component is connected between the orthodontic base and the reverse dental base, and the spacing adjustment component is used to adjust the relative distance between the orthodontic base and the reverse dental base; A guide assembly, which passes between the orthodontic base and the reverse dental base; A flexible anti-reverse component is sleeved on the guide assembly, and the sidewall of the flexible anti-reverse component abuts against the outer peripheral surface of the spacing adjustment assembly. The flexible anti-reverse component is used to apply interference resistance to the spacing adjustment assembly to limit the reverse rotation of the spacing adjustment assembly.
[0007] Preferably, the guide assembly includes two guide rods, which are arranged symmetrically about the spacing adjustment assembly, and the two ends of the guide rods are slidably inserted into the orthodontic base and the reverse dental base, respectively.
[0008] Preferably, the extension member is a long rod; the flexible anti-reverse member is an anti-rotation rubber sleeve.
[0009] Preferably, the spacing adjustment component includes a centrally located adjustment section, and the outer peripheral surface of the adjustment section has alternating dwell sections and anti-spinning sections; The adjusting part is configured such that: when the dwelling section is against the anti-rotation rubber sleeve, the anti-rotation rubber sleeve does not deform; when the anti-rotation section is against the anti-rotation rubber sleeve, the anti-rotation rubber sleeve is compressed and deformed, and in the opposite direction, it restrains the adjusting part.
[0010] Preferably, the spacing adjustment assembly further includes a positive thread screw and a negative thread screw coaxially connected to both ends of the adjustment part, respectively; The orthodontic base is screwed onto the orthodontic screw, and the reverse-tooth base is screwed onto the reverse-tooth screw.
[0011] Preferably, there are four sets of the dwelling section and the anti-rotation section, and each set of the anti-rotation section is provided with an adjustment hole.
[0012] Preferably, the non-adjacent adjustment holes are connected in pairs inside the adjustment part and are distributed in a cross shape.
[0013] Preferably, the anti-rotation rubber sleeve has a semi-circular cross-section, and the side of the anti-rotation rubber sleeve facing the adjustment part is formed as a straight planar segment, which is attached to the adjustment part; the anti-rotation rubber sleeve is designed as a hollow structure.
[0014] Preferably, the dwelling section is a plane, and the anti-rotation section is a curved surface.
[0015] Preferably, the anti-rotation rubber sleeve is provided with a clearance groove, and the clearance groove is adapted to the adjustment hole.
[0016] The beneficial effects of this invention are as follows: This invention provides a backlash-resistant orthodontic expander that uses a flexible backlash-resistant element fitted onto the guide assembly. The deformation interference resistance of this flexible element limits the forced reverse rotation of the spacing adjustment assembly. This device employs a flexible interference structure, resulting in a simplified structure, convenient assembly, and avoidance of the risks of jamming and breakage of small metal mechanical parts. This improves the backlash-resistant stability of orthodontic instruments under long-term stress. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a perspective view of the anti-retrograde orthodontic expander of the present invention; Figure 2 This is an enlarged view of the orthodontic base and the reverse orthodontic base of the anti-retraction orthodontic expander of the present invention; Figure 3 This is a schematic diagram of the screw-connected adjustment assembly in the anti-retraction orthodontic expander of the present invention; Figure 4 This is a schematic diagram of the assembly of the anti-rotation rubber sleeve and guide rod in the anti-retrograde orthodontic expander of the present invention; Figure 5 This is a schematic diagram of the adjusting part of the anti-retrograde orthodontic expander of the present invention in the state of rotation stop; Figure 6 This is a schematic diagram of the adjustment section in the anti-rotation state of the anti-reverse type orthodontic expander of the present invention.
[0019] In the diagram: 1. Orthodontic base; 2. Reverse tooth base; 3. Long rod; 4. Spacing adjustment assembly; 5. Guide assembly; 6. Anti-rotation sleeve; 40. Adjustment section; 41. Dwelling section; 42. Anti-rotation section; 43. Orthodontic screw; 44. Reverse tooth screw; 45. Adjustment hole; 50. Limiting slot; 60. Clearance slot. Detailed Implementation
[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0021] Example 1:
[0022] This invention provides a regressive orthodontic expander; please refer to the attached instruction manual. Figures 1 to 2 The device comprises an orthodontic base 1 and a reverse dental base 2. Extensions extend from the opposite sides of both the orthodontic base 1 and the reverse dental base 2. In the specific implementation configuration, these extensions are long bars 3. After being adjusted to a suitable shape by medical personnel, the long bars 3 are installed and fixed to the dental arches of the patient's upper and lower jaws to provide a supporting reference point for the application of orthodontic forces.
[0023] A spacing adjustment assembly 4 connects the orthodontic base 1 and the reverse dental base 2. This assembly 4 is used to adjust the relative distance between the two bases to widen the dental arch. To ensure precise guidance during the relative translational movement of the two bases, a guide assembly 5 is also provided between the orthodontic base 1 and the reverse dental base 2. Specifically, the guide assembly 5 includes two guide rods, which are symmetrically arranged about the spacing adjustment assembly 4. During assembly, the two ends of the guide rods slide through the orthodontic base 1 and the reverse dental base 2 respectively, thereby restricting the two bases to only be able to slide inward or outward along the axis of the guide rods.
[0024] To prevent the aforementioned spacing adjustment component 4 from rotating and dislocating due to external forces from the jawbone during long-term wear, a flexible anti-retraction element is fitted onto the guide component 5. The flexible anti-retraction element can be made of medical-grade silicone, medical-grade polyurethane, or thermoplastic elastomer. Combined with... Figure 2 and Figure 4 As shown, in terms of specific component selection, the flexible anti-reverse component uses an elastic anti-rotation sleeve 6. The anti-rotation sleeve 6 is fitted onto the guide rod of the guide assembly 5, and its sidewall abuts against the outer peripheral surface of the spacing adjustment assembly 4. The anti-rotation sleeve 6 is mainly used to apply interference resistance to the spacing adjustment assembly 4 to limit its reverse rotation. When medical personnel rotate the spacing adjustment assembly 4, the anti-rotation sleeve 6 generates alternating contact resistance in accordance with the shape change of its outer peripheral surface; after adjustment, the anti-rotation sleeve 6 forms a reverse restraint constraint, thereby limiting its reverse rotation freedom. As an optional embodiment of this application, in addition to the above-mentioned sleeve structure, the flexible anti-reverse component can also be a medical metal elastic spring or similar spring structure fixed on the orthodontic base and abutting against the outside of the adjustment assembly, as long as it can provide alternating interference resistance.
[0025] Please continue to refer to the instruction manual appendix. Figures 2 to 3 In its specific structural implementation, the spacing adjustment component 4 can employ a screw adjustment mechanism with bidirectional threaded drive characteristics. It includes a centrally located adjustment section 40, and a spur screw 43 and a reverse screw 44 coaxially connected to both ends of the adjustment section 40. The spur screw base 1 is screwed onto the spur screw 43, and the reverse screw base 2 is screwed onto the reverse screw 44. When an external tool rotates the adjustment section 40, the engagement of the threads on both sides synchronously drives the spur screw base 1 and the reverse screw base 2 to move away from each other along the guide component 5.
[0026] On the outer circumferential surface of the adjusting section 40, there are alternating residence sections 41 and anti-rotation sections 42. Figure 5 and Figure 6The adjustment part 40 is configured such that when the dwelling section 41 is against the anti-rotation rubber sleeve 6, the anti-rotation rubber sleeve 6 is in a natural state and does not deform; when the anti-rotation section 42 rotates and is against the anti-rotation rubber sleeve 6, the anti-rotation rubber sleeve 6 is compressed and deformed. At this time, the rubber sleeve uses its own restoring force to restrain the surface of the adjustment part 40 in the opposite direction, thereby providing significant rotational interference damping.
[0027] In terms of detailed layout, there are four sets of each of the dwell section 41 and anti-rotation section 42, and each set of anti-rotation section 42 is equipped with an adjustment hole 45. Furthermore, the non-adjacent adjustment holes 45 are connected in pairs inside the adjustment section 40 and arranged in a cross shape. This cross-shaped distribution of the four sets of anti-rotation sections 42 ensures that when medical personnel insert external tools into the adjustment holes 45 to rotate the adjustment section 40, each rotation cycle is defined as 90°. This not only provides the operator with clear feedback on the tactile feedback but also helps to quantify clinical bow dilation procedures.
[0028] Please refer to the instruction manual. Figures 4 to 6 The anti-rotation sleeve 6 has a semi-circular cross-section, resulting in a flat, planar section on the side facing the adjustment part 40. This planar section can stably abut against the outer circumference of the adjustment part 40. To provide deformation buffer space, the interior of the anti-rotation sleeve 6 is hollow. Furthermore, a limiting groove 50 is partially recessed on the guide rod to facilitate the snap-fit installation of the anti-rotation sleeve 6 and prevent axial slippage under lateral friction. An clearance groove 60 is also provided on the outer wall of the anti-rotation sleeve 6, which is adapted to the adjustment hole 45 to ensure that the adjustment tool is not interfered with by the outer wall of the anti-rotation sleeve 6 when inserted into the adjustment hole 45.
[0029] Regarding the specific surface configuration of the adjustment section 40, the dwelling section 41 is a plane, and the anti-rotation section 42 is an outwardly convex curved surface.
[0030] When the adjusting part 40 is stationary, the flat section of the anti-rotation sleeve 6 rests against the flat dwelling section 41. At this time, the anti-rotation sleeve 6 is not subjected to additional compressive force, which helps to reduce internal stress fatigue of the elastic material. When medical staff adjust the spacing, the flat section of the anti-rotation sleeve 6 slides and rests against the curved anti-rotation section 42. The anti-rotation section 42 presses the anti-rotation sleeve 6 outward, causing it to deform in a concave shape. As the rotation stroke reaches ninety degrees, the flat section of the anti-rotation sleeve 6 detaches from the curved surface compression, returns to its original position, and rests against the next flat dwelling section 41. After the adjustment is completed, the deformation difference of the outer peripheral interface forms a reverse interference resistance, causing the adjusting part 40 to be subjected to a persistent reverse restraint, thereby effectively limiting its rotation.
[0031] Example 2:
[0032] Unlike Example 1, this example achieves anti-reverse locking through the difference in surface friction characteristics. Specifically, the dwell section 41 is a smooth surface, while the anti-rotation section 42 is a rough surface.
[0033] When the adjusting part 40 is in the stationary position, the flat section of the anti-rotation sleeve 6 rests against the smooth-surfaced dwelling section 41, resulting in low rotational resistance at the initial stage of rotation. When medical personnel rotate the adjusting part 40, the flat section of the anti-rotation sleeve 6 gradually slides and rests against the anti-rotation section 42. Since the anti-rotation section 42 has a rough surface, it significantly increases the frictional damping force between itself and the anti-rotation sleeve 6. After the medical personnel exert force to overcome this frictional force and complete the rotation, the anti-rotation sleeve 6 rests against the next smooth-surfaced dwelling section 41. After adjustment, the static frictional resistance generated by the rough surface effectively restricts the reverse rotation of the adjusting part 40.
[0034] This article uses specific embodiments to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.
Claims
1. A type of anti-retrograde orthodontic expander, comprising an orthodontic base (1), a retrograde base (2), a spacing adjustment assembly (4) connecting the two, and a guide assembly (5) passing through the two, wherein extension members extend from opposite sides of both the orthodontic base (1) and the retrograde base (2), characterized in that, Also includes: A flexible anti-reverse component is sleeved on the guide assembly (5), and the sidewall of the flexible anti-reverse component abuts against the outer peripheral surface of the spacing adjustment assembly (4). The flexible anti-reverse component is used to apply interference resistance to the spacing adjustment assembly (4) to limit the reverse rotation of the spacing adjustment assembly (4).
2. The anti-retrograde orthodontic expander according to claim 1, characterized in that, The guide assembly (5) includes two guide rods, which are arranged symmetrically with respect to the spacing adjustment assembly (4). The two ends of the guide rods slide through the orthodontic base (1) and the reverse dental base (2), respectively.
3. The anti-retrograde orthodontic expander according to claim 1, characterized in that, The extension component is a long rod (3); the flexible anti-reverse component is an anti-rotation rubber sleeve (6).
4. The anti-retrograde orthodontic expander according to claim 3, characterized in that, The spacing adjustment component (4) includes an adjustment part (40) arranged in the center, and the outer peripheral surface of the adjustment part (40) is alternately distributed with a dwelling section (41) and an anti-spinning section (42). The adjustment part (40) is configured such that when the dwelling section (41) is against the anti-rotation rubber sleeve (6), the anti-rotation rubber sleeve (6) does not deform; when the anti-rotation section (42) is against the anti-rotation rubber sleeve (6), the anti-rotation rubber sleeve (6) is squeezed and deformed and is restrained by the adjustment part (40) in the opposite direction.
5. The anti-retrograde orthodontic expander according to claim 4, characterized in that, The spacing adjustment assembly (4) also includes a positive thread screw (43) and a negative thread screw (44) coaxially connected to both ends of the adjustment part (40). The orthodontic base (1) is screwed onto the orthodontic screw (43), and the reverse tooth base (2) is screwed onto the reverse tooth screw (44).
6. The anti-retrograde orthodontic expander according to claim 4, characterized in that, The dwelling section (41) and the anti-rotation section (42) are each provided with four sets, and each set of the anti-rotation section (42) is provided with an adjustment hole (45).
7. The anti-retrograde orthodontic expander according to claim 6, characterized in that, The non-adjacent adjustment holes (45) are connected in pairs inside the adjustment part (40) and are distributed in a cross shape.
8. The anti-retrograde orthodontic expander according to claim 4, characterized in that, The anti-rotation rubber sleeve (6) has a semi-circular cross section. The side of the anti-rotation rubber sleeve (6) facing the adjustment part (40) is formed as a straight planar segment, and the planar segment is attached to the adjustment part (40). The anti-rotation rubber sleeve (6) is designed as a hollow structure.
9. A backlash-resistant orthodontic expander according to claim 4, characterized in that, The dwelling section (41) is a plane, and the anti-rotation section (42) is a curved surface.
10. A backlash-resistant orthodontic expander according to claim 6, characterized in that, The anti-rotation rubber sleeve (6) is provided with a relief groove (60), and the relief groove (60) is adapted to the adjustment hole (45).