Bone anchorage type maxillary distraction osteogenesis device

Abstract

The utility model provides a bone anchorage type maxillary distraction osteogenesis device which comprises a spiral expansion device, and a rear base plate of the spiral expansion device is fixed to the rear half section of the maxillary bone through a left anchorage nail and a right anchorage nail. The front base plate and the rear base plate are respectively connected with at least two belt rings through belt ring connecting rods, the left front belt ring and the right front belt ring connected with the front base plate are at least sleeved on the first front molars on the corresponding sides, and the left rear belt ring and the right rear belt ring connected with the rear base plate are sleeved on the first molars and / or the second molars on the corresponding sides; the two front band rings are connected through a labial arch, and a lip baffle is fixed in the middle of the labial arch; a traction hook matched with a front tractor is fixedly connected to the outer ring face of the rear belt ring. According to the utility model, the osteotomy gap between the first premolar and the second premolar can be stably and effectively stretched, so that the aim of correcting skeletal hypoplasia or repairing bone defects is fulfilled.

Description

Technical Field

[0001] This utility model relates to the field of oral medical device technology, specifically to a bone anchorage maxillary distraction osteogenesis device. Background Technology

[0002] Distraction osteogenesis is an endogenous bone tissue engineering technique that involves cutting the bone and placing distractors on both sides of the cut line to slowly stretch the gap between the cuts, thereby stimulating the body's tissue regeneration potential. New bone tissue is continuously formed within the stretch gap, while the muscles, nerves, blood vessels, skin, and other tissues around the bone are simultaneously lengthened, thus achieving the goal of lengthening the bone.

[0003] Distraction osteogenesis is particularly suitable for maxillofacial deformities such as maxillary hypoplasia and narrow dental arches. Severe maxillary hypoplasia cannot be treated simply by surgery and orthodontics; distraction osteogenesis is necessary to increase bone volume for subsequent treatment. In oral and maxillofacial surgery, maxillary distraction osteogenesis involves making a horizontal mucosal incision 8 mm above the mucosal junction of the vestibule between the second and second maxillary premolars to create an osteotomy space between the first and second premolars. This space is then expanded using distraction osteogenesis.

[0004] In current maxillary distraction osteogenesis treatments, traditional external distraction osteogenesis devices are typically used to distract the osteotomy space. The main device of this external distraction osteogenesis device is located outside the skin, allowing doctors and patients to directly observe the changes during the distraction process and adjust the speed and force as needed. However, because it is externally installed around the maxilla, it suffers from drawbacks such as large size, unstable fixation, and poor aesthetics. This makes it difficult for patients to accept and adapt to for extended periods, relatively limiting bone gain and severely impacting the treatment experience and outcome.

[0005] Based on the above problems, it is necessary to design an internal bone-supported maxillary distraction osteogenesis device to stably and effectively distract the interproximal space between the first and second premolars, thereby achieving a better treatment effect for maxillofacial deformities. Utility Model Content

[0006] This invention provides a bone-supported maxillary distraction osteogenesis device, which can stably and effectively distract the incisal gap between the first and second premolars to correct insufficient bone development or repair bone defects. It also has the advantages of small size, stable installation, and good aesthetics.

[0007] To achieve the above-mentioned technical objectives and effects, this utility model solves the above-mentioned problems through the following technical solution:

[0008] A bone-supported maxillary distraction osteogenesis device includes a spiral expander, which comprises an anterior base and a posterior base, connected by a main shaft stud and a guide rod. The posterior base is fixed to the posterior half of the maxilla by two anchorage screws. The anterior and posterior bases are each connected to at least two loops via loop connecting rods. The two anterior loops connected to the anterior base are fitted onto at least the first premolar on the corresponding side, and the two posterior loops connected to the posterior base are fitted onto the first molar and / or second molar on the corresponding side. The two anterior loops are connected by a labial arch, and a lip stop is fixed in the middle of the labial arch. A traction hook that cooperates with the anterior traction device is fixed to the outer ring surface of the posterior loop, with the hook extending forward against the outer tooth surface.

[0009] Furthermore, the anterior band is fitted onto the first premolar and canine, and the posterior base is fitted onto the second molar, the first molar, and the second premolar.

[0010] Furthermore, the traction hook is installed on the outer ring face of the rear belt ring corresponding to the position of the second premolar, and the traction hook is welded to the rear belt ring.

[0011] Furthermore, the lip guard is an inverted trapezoidal arc surface structure with rounded corners. The arc length of the lip guard is greater than the sum of the arc lengths of the two central incisors, but less than the sum of the arc lengths of the two central incisors and lateral incisors.

[0012] The advantages and effects of this utility model are:

[0013] 1. The bone-supported maxillary distraction osteogenesis device proposed in this scheme expands the incisal space by using a spiral expander set along the anterior-posterior direction of the maxilla. The anterior and posterior bases move relative to each other under the action of the expansion force. The expansion force is transmitted to the maxilla through the band link and band, so that the incisal space between the first premolar and the second premolar is stably and effectively distracted.

[0014] 2. In this design, the posterior base of the spiral expander is fixed to the posterior half of the maxilla by two anchoring screws on the left and right sides. The use of left and right anchoring screws can prevent rotation of the spiral expander during expansion. At the same time, the labial arch connects the two anterior bands, making the front part a whole. The labial arch and the connecting rods of the two side bands form a triangular stability structure, which can improve the stability and synchronicity of forward traction and avoid uneven movement of the left and right sides of the maxilla affecting traction.

[0015] 3. In this treatment plan, a lip guard is installed on the lip arch as a support, which can strengthen the connection strength of the lip arch, help guide the direction of traction force, prevent improper pressure of the lips on the teeth, reduce side effects, and more effectively treat maxillary sagittal hypoplasia.

[0016] 4. The device is fixed to the outer ring surface of the posterior band with a traction hook. The traction hook works in conjunction with the anterior traction device to pull the posterior half of the maxilla (thus the entire maxilla moves forward), which can stimulate the growth and development of the maxilla and its surrounding sutures, increasing the bone mass of the maxilla. Combining it with anterior traction allows for better control of the direction of maxillary traction.

[0017] This treatment plan features two overlapping stages of traction. The first stage uses a spiral expander to stretch the interproximal space between the first and second premolars; the second stage uses an anterior traction device to pull the entire maxilla forward, achieving a better cumulative therapeutic effect. In use, traction can be performed in stages according to the patient's actual condition. It can be combined or used individually, providing more options and treatment plans for clinical practice. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the bone-supported maxillary distraction osteogenesis device of this utility model;

[0019] Figure 2 This is a front view of the bone-supported maxillary distraction osteogenesis device of this utility model;

[0020] Figure 3 This is a side view of the bone-supported maxillary distraction osteogenesis device of this utility model;

[0021] Figure 4 This is a schematic diagram of the present invention working in conjunction with the front traction device.

[0022] Figure number markings: 1. Spiral expander, 11. Anterior base, 12. Rear base, 13. Main stud, 14. Guide rod, 2. Support nail, 3. Linkage rod with circumference, 4. Circumference, 41. Anterior circumference, 42. Rear circumference, 5. Labial arch, 6. Labial stop, 7. Traction hook, 8. Anterior traction device, 9. Osteotomy gap. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0024] The bone-supported maxillary distraction osteogenesis device described in this embodiment is as follows: Figure 1 , 2 As shown in Figure 3, its main body includes a spiral bow expander 1, a support nail 2, a ringed connecting rod 3, a ring 4, a lip bow 5, a lip stop 6, a traction hook 7, and a front traction device 8. In the embodiment, the front-back direction is consistent with the front-back direction of the human body.

[0025] The spiral expander 1 includes a front base 11 and a rear base 12, which are connected by a central main stud 13 and two guide rods 14. The main stud 13 has a rotating hole in the middle, which can be rotated by an expander key that matches the rotating hole, thereby adjusting the relative distance between the front base 11 and the rear base 12. The rear base 12 is fixed to the posterior half of the maxilla by two anchorage screws 2, thus fixing the spiral expander 1 to the maxilla.

[0026] The anterior base 11 is connected to two anterior bands 41 on the left and right sides via two banded connecting rods 3. The anterior bands 41 are fitted onto the first premolar and canine on the corresponding side. The posterior base 12 is connected to two posterior bands 42 on the left and right sides via two banded connecting rods 3. The posterior bands 42 are fitted onto the second molar, first molar, and second premolar on the corresponding side. The first and second molars have strong anchorage and are relatively difficult to move. The bands fitted onto these two teeth provide good support and auxiliary traction for the distraction osteogenesis device, thereby helping to ensure the stability and effectiveness of the traction process, allowing the traction force to act more stably on the jawbone, and promoting the distraction osteogenesis effect. In this embodiment, the bands 4 are fitted onto multiple teeth, which can distribute the traction force across multiple teeth, avoiding excessive force on a single tooth and causing damage, and further improving the traction efficiency.

[0027] As attached Figure 1 , 2 As shown, the two front bands 41 on the left and right sides are connected by the lip arch 5. A lip guard 6 is provided in the middle of the lip arch 5. The lip guard 6 is a resin part that is cast and fixed to the lip arch 5 by a mold. The lip guard 6 is an inverted trapezoidal arc surface structure with rounded corners. The arc length of the lip guard 6 is greater than the sum of the arc lengths of the two central incisors, but less than the sum of the arc lengths of the two central incisors and lateral incisors.

[0028] A traction hook 7, which mates with the front traction device 8, is welded to the outer ring face of the rear band 42, corresponding to the position of the second premolar. The hook body extends forward, conforming to the outer tooth surface. (See attached image) Figure 4 As shown, the traction hook 7 is connected to the anterior traction device 8 via a rubber band. The combination of the traction hook 7 and the anterior traction device 8 can more effectively stimulate the growth and development of the maxilla and its surrounding sutures, increasing the bone mass of the maxilla. For some patients, the anterior traction device 8 can be used in conjunction with other devices during treatment, depending on the actual situation. The usage time and environment of the anterior traction device 8 can be appropriately arranged, without affecting the aesthetics of going out or communicating, making its flexible use more in line with the needs of patients.

[0029] When using the bone-supported maxillary distraction osteotomy device described in this embodiment, firstly, an osteotomy gap 9 is formed between the first and second premolars. A horizontal mucosal incision is made 8 mm above the mucosal transition point in the vestibular sulcus between the two maxillary second premolars. The mucoperiosteum is dissected subperiosteally upwards to expose the anterior wall of the maxilla, the lower outer margin of the piriform aperture, the nasal floor, the lateral walls of the nasal cavity, and the nasal septum. The connection between the nasal septal cartilage and the anterior nasal spine is severed. The mucoperiosteum at the extraction site is dissected down to the alveolar ridge crest. At the expected vertical osteotomy center position, at least 5 mm above the canine root apex, the incision is turned anterosuperiorly to the edge of the piriform aperture, as shown in the appendix. Figure 3 As shown. Then, the spiral expander 1 is installed in the posterior half of the maxilla using the anchorage screw 2, and the bands 4 are fitted onto the corresponding teeth to complete the positioning and installation of the device.

[0030] Starting three days post-surgery, apply 1 / 4 circle (0.25mm) of traction daily for the first week. Depending on the situation, this can be adjusted to 2 circles (2mm) daily. Once the appropriate traction amount is achieved according to treatment needs, the traction device should be maintained for three months to maintain efficacy. If soft tissue tears or other conditions are found during follow-up examinations, the device can be retracted at any time. Regularly checking the relative distance between the anterior base 11 and posterior base 12 post-surgery allows for effective control of maxillofacial orthodontics, enabling timely development and adjustment of effective treatment plans. The maxillary distraction osteogenesis device described in this embodiment can achieve stable and effective distraction of the incisal space between the first and second premolars, achieving the purpose of correcting skeletal hypoplasia or repairing bone defects.

[0031] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A bone-braced maxillary distraction osteogenesis device, characterized by: The device includes a spiral expander (1), which includes an anterior base (11) and a posterior base (12) arranged at the front and back. The anterior base (11) and the posterior base (12) are connected by a main shaft stud (13) and a guide rod (14). The posterior base (12) is fixed to the posterior half of the maxilla by two anchorage screws (2) on the left and right sides. The front base (11) and rear base (12) are respectively connected to at least two rings (4) via ring connecting rods (3). The two left and right front rings (41) connected to the front base (11) are at least fitted on the first premolar on the corresponding side, and the two left and right rear rings (42) connected to the rear base (12) are fitted on the first molar and / or second molar on the corresponding side. Two front side loops (41) are connected by a lip bow (5), and a lip stop (6) is fixed in the middle of the lip bow (5); the outer ring surface of the rear side loop (42) is fixed with a traction hook (7) that cooperates with the front traction device (8), and the hook body extends forward in contact with the outer tooth surface.

2. The bone-borne maxillary distractor device of claim 1, wherein: The anterior band (41) is fitted onto the first premolar and canine, and the posterior base (12) is fitted onto the second molar, the first molar, and the second premolar.

3. The bone-borne maxillary distractor device of claim 1, wherein: The traction hook (7) is installed on the outer ring of the rear side ring (42) corresponding to the position of the second premolar, and the traction hook (7) is welded to the rear side ring (42).

4. The bone-borne maxillary distractor device of claim 1, wherein: The lip guard (6) is an inverted trapezoidal arc surface structure with rounded corners. The arc length of the lip guard (6) is greater than the sum of the arc lengths of the two central incisors, but less than the sum of the arc lengths of the central and lateral incisors on both sides.

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