改良环甲软骨接近术治疗声带松弛所致音调过低

Correcting The Overlow Pitch Owing To Vocal Cord Relaxation Lag Modified Cricothyroid Approximation

自1985年以来，开展了甲状软骨成型术矫治嗓音异常。临床实践观察到环甲软骨接近术（甲状软骨成型术Ⅳ型）治疗声带松弛所致音调过低是有一定限度的，术后会出现不同程度的音调下降。为此，将环甲软骨接近术进行了改良，即在环甲软骨接近术缝扎后，再将甲状舌骨肌下端自甲状软骨板附丽处分离，向下牵拉与环状软骨（膜）缝合，以加强环甲间距缩小的力度，施术12例，术后观察一年，效果令人满意。

Since 1985 We have developed 'tha thyroid cratilage-plasty' to correcd the abnomal voice in patients.From our clinical practice, We have found that the original cricothy roid approximation (i. e. thyroid cartilag-plasty type Ⅳ). For correcting tha overlow pitch because of Vocal cord relaxation being more or less limited in therapeutic efficacy various segrees of lowering of pitch have been encountered in some cases post such operiation.so, we modify the original cricothyroid appreximation as follows: to separate the lower end of thyrohyoid musele from tha attached pert of thyroid cartilage plate and stretch it down wards, bing sutured with cricod cartilage (membrane) after the suture and ligation of cricoid thyroid cartilage. By this, the degree of shortening of the cricoid-thyroid distance could be increased 12 cases were operated on by using this modified technique and followed up for 1 year. The therapeutic effect was stisfactory.