THYROPLASTY - A NEW APPROACH

A new type of thyroplasty implant (prosthesis) has been designed to be used as part of a surgical operation that accomplishes medial displac ement of a paralyzed vocal cord. The implant is inserted through a rec tangular window fashioned in the thyroid lamina on the side of the voc al cord paralysis. Instruments for measuring the location and outline of the window in the thyroid lamina are presented. A thyroplasty saw b lade is introduced. By using this blade, a window of precise measureme nt can be constructed without injury to the underlying perichondrium. The implant is constructed from a biocompatible, medical-grade polymer . Four sizes each are available for the male and female larynges. The proper-size implant can be selected with a measuring device. It is not necessary to alter the implant at the time of surgery; it snaps into place and suturing is not necessary. Once the implant is inserted, its medial or lateral displacement is not possible; on the other hand, th e implant can be easily removed if vocal cord function returns, or if a change to a different-size implant is indicated. The design of the i mplant will close the posterior commissure.