DE20004588U1 - Anchored cylindrical alveolar distractor - Google Patents

Description

Surface-anchored cylindrical alveolar distractor

Prof. Dr. Dr. W. Engelke

In recent years, distraction osteogenesis has significantly expanded the spectrum of osteoplastic operations in the oral and maxillofacial region. According to Zöller, the advantages are the simultaneous soft tissue stretching, the lack of removal morbidity and the vascular supply of the distracted segment. Zöller sees the aesthetic impairment during distraction with T-shaped distractors as a disadvantage. Since conventional distractors are usually attached to the base, extensive preparation is required for insertion as well as removal. In contrast, distraction implants, in which dental implants achieve the bony height gain through vertical extension via a spindle, have the advantage of not requiring secondary intervention, but the disadvantage that secure anchoring of the implant parts to be distracted is often not possible in individual patient situations, since the jaw ridge width in the respective region is usually not sufficient.

According to the invention, the disadvantage of the distractors described is solved in that a cylindrical distractor, which is firmly connected to one or more extensions in the manner of a micro-osteo-synthesis plate, is inserted into a vertical hole in the bone at the edge of the mobilized fragment. It obtains its stability through a micro-osteo-synthesis on the crestal surface of the bone adjacent to the distraction segment. Distraction takes place by activating a spindle, which moves an osteo-synthesis plate of variable shape and size vertically to the distractor axis via a support. The osteo-synthesis plate is attached to the surface of the segment to be distracted. By using two or more distractors, distraction can also be carried out at the ends of larger segments with different dimensions in accordance with the requirements of the anatomical situation. The great variability in the surface anchoring of the distractor allows the distraction of the mobilized segment both vertically and in another individually predetermined spatial direction. The aesthetic impact is minimal, as only a pin-shaped activator breaks through the mucous membrane, which can be concealed by suitable prosthetic aids if necessary.

Fig. 1 shows the surface-anchored cylindrical alveolar distractor OZAD (1) in a side view with an extension, Fig. 2 in an occlusal view in a variant with 2 osteosynthesis plates as extensions. In Fig. 3 it is inserted at the transition between stable bone (2) and the distraction segment (3) like an endosseous implant. The distraction spindle (4) has a support (5). The support lifts an osteosynthesis plate (6) vertically. The extension of the OZAD like an osteosynthesis plate is connected to the distraction segment (3) via bone screws (7). When the spindle (4) is rotated via the transgingival activator screw (8), the distraction segment moves vertically. After the distraction process has ended, the activator screw is removed by rotating in the opposite direction, and the OZAD is removed after the ossification process has ended. To facilitate removal, it may contain a thread on its outer surface, the direction of which should preferably be opposite to the internal thread.

List of reference symbols

1 Surface anchored cylindrical alveolar distractor

2 Alveolar bones

3 Distraction bone segment

4 Distraction spindle

5th edition

6 Osteosynthesis plate

7 Bone screw

8 Transgingival activation key

9 Perforation for security thread

10 Extension in the manner of an osteosynthesis plate

Illustrations

Fig. 1 Surface-anchored cylindrical alveolar distractor in lateral view Fig. 2 Surface-anchored cylinder distractor in occlusal view with osteosynthesis plates.

Fig. 3 Distractor and distraction segment in situ

Claims (8)

1. Device for osteodistraction, characterized in that a cylindrical hollow body with an internal thread for attachment in and on the jawbone has one or more extensions in the manner of osteosynthesis plates, with which an anchoring on the adjacent bone surface can be achieved. 2. Device according to ( 1 ), characterized in that the extensions are attached to the cylinder at the end. 3. Device according to ( 1 ), characterized in that the extensions are suitably adaptable by cold deformation of the surface of the bone. 4. Device according to ( 1 ) characterized in that the spindle guided in the cylinder via the internal thread has a support for an osteosynthesis plate guiding the distraction segment 5. Device according to ( 1 ), characterized in that a transgingival tube-shaped activation key with a threaded nut is attached to the distraction spindle, which is tightened during distraction and loosened when rotated in the opposite direction. 6. Device according to ( 1 ), characterized in that the distractor can have a screw thread on its outer surface with a thread direction preferably opposite to the internal thread. 7. Device according to ( 1 ), characterized in that the material used is preferably titanium. 8. Device according to ( 1 ), characterized in that the transgingival activation key has a perforation for a security thread.