Customized intraoral jaw distractor and use of such a distractor in order to obtain almost continuous distraction

摘要

The invention relates to a customized intraoral jaw distractor, of the type that comprises two anchoring means (1, 2) fastened to the mandibular body at two fixed anchor points, located on either side of the osseous callus. Such a distractor is characterized in that it includes: a) a threaded cylindrical rail (6) connecting the two anchoring means (1, 2); b) a mobile carriage (10) guided to slide on the rail (6) and attached to the osseous segment to be distracted, said mobile carriage being provided with a worm screw (11) with a thread that complements that of the rail and engages with the latter; c) a pin (12) integral to the worm screw (11) and controlling the rotation thereof, said pin, which is parallel to the rail (6), being supported by two bearings (13, 14) arranged on the mobile carriage (10), on either side of the worm screw; d) at least one resilient part (15) through which said pin (12) passes and which rests against one end (16) of the worm screw (11) and against the inner wall (18) of the bearing (14) that faces said end (16). The invention can be used for reconstruction of a missing or deficient osseous segment by means of osteogenic distraction.

主权项

1. A customized intraoral jaw distractor comprising:
a) a threaded cylindrical rail connecting two anchoring means configured to attach to a mandibular body at anchor points, located on both sides of an osseous segment, b) a mobile carriage guided to slide on the threaded cylindrical rail and configured to attach to the osseous segment to be distracted, said mobile carriage being provided with a worm screw with a thread that complements a thread on the rail and engages with the threaded cylindrical rail on the threaded cylindrical rail, c) a pin integral to the worm screw, the pin configured to control the rotation of the worm screw, said pin, which is roughly parallel to the threaded cylindrical rail, being supported by first and second bearings arranged on the mobile carriage, wherein the first bearing on the mobile carriage is adjacent to a first section of the worm screw and wherein the second bearing is in contact with a second section of the worm screw; and d) at least one resilient part through which said pin passes and which rests on a first side against one end of the worm screw and on a second side against a first inner wall of the first bearing that faces said end, wherein a distance separating the first inner wall of the first bearing and a second inner wall of the second bearing is equal to a length of the worm screw increased by a height of the at least one resilient when the resilient part is resting, wherein the at least one resilient part has a resting shape that is compressed through a rotation of the worm screw, and wherein, subsequent to the rotation of the worm screw, the at least one resilient part resumes the resting shape resulting in a continuous or near-continuous movement of the mobile carriage.