FIELD: medicine.
SUBSTANCE: method for manufacturing of a nasal stent for treatment of patients with congenital maxillofacial abnormalities or acquired deformities comprises external nose and nasal passages cast preparation by impression material overlaying on the outer nose and administration into the nasal passages. Thermoplastic mass is used as the impression material. Prior to the introduction into the nasal passages, it is shaped as two cones with a base diameter of 1.0-1.5 cm around two steel wires, with metal wire ends closed by the thermoplastic mass. The thermoplastic mass on steel wires is removed from the nasal passages to solidify. After checking, the solidified nasal casts are again introduced into the nasal passages and left there. Prior to application to the outer nose, the impression thermoplastic mass is shaped as two triangles and superimposed on the lateral surface of the nose with the ability to fully cover these surfaces and to be connected at the vertices of the triangles near the nose tip. After application, the impression thermoplastic mass is pressed from both sides at the point of lateral nasal cartilages connection with small alar cartilages. When connecting the triangles vertices near the nose tip, thermoplastic mass excess is formed, which is lowered to the nose base along the columella, and then the thermoplastic mass excess is coupled to the nasal passages cast, thus obtaining a single cast of the nasal passages and the outer nose. The singl cast is withdrawn grasping the both sides of the back ends of steel wires. Then 3-dimensional laser scanning of the resultant single impression of the nasal passages and the outer nose is performed. Then a 3-dimensional digital model of the outer nose and nasal passages is obtained. Then a nasal stent is virtually designed followed by its manufacture from a monolithic array of a diamond shaped preform, using a milling machine with numerical control.
EFFECT: improved accuracy of nasal stent manufacture, possibility of nose and nasal septum cartilages shape and position correction during growth for children, possibility of nasal passages lumen narrowing and postoperative complications preventing for adult patients; possibility of nasal stent application for newborns; reduced time and complexity of nasal stent manufacture; possibility of remote nasal stent manufacture.
8 dwg, 5 ex
