TH19808Y - Jawbone extension device - Google Patents

Abstract

The maxillofacial lengthening device consists of a sliding rail, one end of which is connected to a bone fixation plate. The sliding rail has sliding grooves containing a spring coil. Another bone fixation plate is attached to the same rail. The other end of the sliding rail has an external threaded opening for locking with a pin, allowing adjustment of the spring coil's extension distance and the distance between the two fixation plates. The spring coil is made of a shape memory alloy, providing a continuous lengthening force of 300 to 500 grams. Using a shape memory alloy spring coil instead of the traditional screws for force application in the maxillofacial lengthening device reduces patient pain and improves the effectiveness of the lengthening procedure. Furthermore, due to the spring's self-extending properties, it eliminates the need for patient cooperation in daily screw adjustments (2 to 4 times per day), reducing the risk of incorrect screw placement and patient dissatisfaction, leading to more effective treatment.

Claims (9)

1. The jawbone extension instrument consists of a sliding rail (1) at one end connected to a bone fixation plate (2). The sliding rail (1) has a sliding groove (3) containing a spring coil (4). The bone fixation plate (5) has an opening (6) on the other end, which is closed with a pin (7) for adjusting the extension distance of the spring coil (4). Its characteristics are: The sliding rail (1) is a hollow, smooth cylinder. One end is closed and connected to the extension (29) of the bone fixation plate (2). There is a sliding groove (3) along the length from the extension (29) of the bone fixation plate (2) to the opening (6). The bone fixation plate (2) is a smooth plate that is attached to the lower or upper jawbone. It has several openings for attachment to the bone fragments, which are sized appropriately for inserting dental screws. The central area of the bone fixation plate (2) is attached to the slide rail (1) by an extension (29). The slide rail groove (3) contains a spring coil (4) and serves as a slide rail for the bone fixation plate (5). It has an opening (6) for fitting onto a pin (7) for adjusting the extension distance of the spring coil (4). The spring coil (4) provides a continuous lengthening force of 300 to 500 grams to separate the bone fixation plate (2) and bone fixation plate (5). The bone fixation plate (5) is a flat plate that attaches to the lower or upper jawbone. It has several openings for attachment to the bone fragments, and these openings are sized appropriately for inserting dental screws. In the center of the bone fixation plate (5) there is a central axis (59) for attaching the bone fixation plate (5) to the sliding rail groove (3). The pin (7) serves to adjust the extension distance of the spring coil (4) by being inserted into the sliding rail (1) through the opening (6) along the central axis of the bone fixation plate (5) and the sliding rail (1). 2. The jawbone extension device, according to claim 1, where the bone fixation plate (2) consists of openings (21, 22, 23, 24, 25, 26, 27, 28) for attachment to dental screws to the jawbone, 4 on each side, totaling 8 openings. The openings (21, 22, 23, 24, 25, 26) are arranged longitudinally at a right angle to the slide rail (1), 3 on each side, totaling 6 openings, and between the midpoint above openings (21, 22) and (24, 25) there are openings (27) and (28), respectively. 3. A jawbone extension device according to claim 1 or 2 where the coil spring (4) is a shape memory alloy. 4. A jawbone extension device in accordance with any one of the claims 1 through 3, where the spring coil (4) is a nickel-titanium alloy (Nickel-Titanium, NiTi, alloy). 5. A jawbone extension device, according to any one of claims 1 through 4, in which the bone fixation plate (5) consists of openings (51, 52, 53, 54, 55, 56, 57, 58) for securing screws to the jawbone, 4 openings on each side, totaling 8 openings; openings (51, 52, 53, 54, 55, 56) are arranged longitudinally at right angles to the sliding rail (1), 3 openings on each side, totaling 6 openings; and between the midpoint above openings (51, 52) and (54, 55) there are openings (57) and (58), respectively. 6. A jawbone extension device according to any one of claims 1 to 5, where the opening (6) is of the standard M2.5x0.45 - 6H external thread type. 7. A jawbone extension device according to any one of claims 1 through 6, in which pin (7) has a groove (8) for determining the extension distance of the spring coil (4). 8. A jawbone extension device in accordance with any one of claims 1 through 7, where the pin (7) has a hexagonal head in the standard M2.5x0.45 - 6g. 9. A jawbone extension instrument according to any one of the claims 1 to 8, where the slide rail (1), bone fixation plate (2), bone fixation plate (5), pin (7) are made of stainless steel, namely stainless steel (SUS316L).