下顎孔伝達麻酔時に外側翼突筋に破折注射針が迷入した1例 A case of accidental insertion of a broken injection needle into the lateral pterygoid muscle during conduction anesthesia of the mandibular foramen
A case of accidental insertion of a broken 30-gauge disposable injectionneedle in a patient receiving conduction anesthesia of the mandibular foramen is reported. Computed tomographic examination showed a broken injection needle inserted into the inferior head of the lateral pterygoid muscle behind the lateral pterygoid plate. Under general anesthesia, the broken needle was removed after difficulty infinding it. The length of the broken needle was 21mm. Electron microscopic examination showed deformation of the broken needle contour caused by bending force, with a spiral pattern of the broken plane. The break point was apparently formed by strong bending and torsion, causing the needle to break.
日本口腔外科学会雑誌 50(4), 263-266, 2004-04-20
Japanese Society of Oral and Maxillofacial Surgeons