title: Preliminary investigation of adjustable balloon implant for type I thyroplasty.
abstract: OBJECTIVE
  We present the adjustable balloon implant (ABI), a novel implant to be used in type I thyroplasty for the treatment of vocal fold paralysis. The ABI offers the same medialization provided by other implants, but can easily be catered to individual patient anatomy as well as modified postoperatively without the need for a revision thyroplasty.
  
  
  METHODS
  Repeated measures with each larynx serving as its own control.
  
  
  METHODS
  Medialization thyroplasty (MT) with the ABI was performed on five excised canine larynges. Mucosal wave, aerodynamic, and acoustic parameters were measured for three conditions: normal; right vocal fold paralysis; and paralysis with the ABI.
  
  
  RESULTS
  Insertion of the ABI resulted in significant decreases in both phonation threshold pressure and phonation threshold flow. Perturbation parameters of percent jitter and percent shimmer were also significantly decreased and restored to normal levels. Signal-to-noise ratio was significantly increased to the normal level as well. The mucosal wave was preserved after implant insertion.
  
  
  CONCLUSIONS
  This preliminary experiment showing significant improvements in aerodynamic and acoustic parameters demonstrates the potential of the ABI as a thyroplasty implant. Effective medialization and preservation of the mucosal wave combined with postoperative adjustability makes it a potentially valuable clinical device.
authors.affiliation: University of Wisconsin-Madison School of Medicine and Public Health, Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, Madison, Wisconsin 53706, USA.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Hoffman
authors.forename: Rachel E
authors.initials: RE
authors.lastname: Witt
authors.forename: Timothy M
authors.initials: TM
authors.lastname: McCulloch
authors.forename: Jack J
authors.initials: JJ
authors.lastname: Jiang
mesh_terms: D000818:Animals; D004285:Dogs; D006801:Humans; D007734:Kymography; D058753:Laryngoplasty / Q000379:methods*; D007828:Laryngoscopy; D010699:Phonation / Q000502:physiology; D019736:Prostheses and Implants; D012828:Silicones; D013018:Sound Spectrography; D014741:Video Recording; D014826:Vocal Cord Paralysis / Q000534:rehabilitation* / Q000601:surgery*
chemical_list: D012828:Silicones