The Effect of Endoscopic Tympanoplasty on Cochlear Function

OBJECTIVES: The aim of this prospective clinical study was to measure the audiologic outcomes of the patients that underwent endoscopic transcanal cartilage tympanoplasty, and to investigate the effects on cochlear function. METHODS: Thirty-three patients (33 ears) who were diagnosed with noncomplicated chronic otitis media and underwent endoscopic transcanal cartilage tympanoplasty technique were included. Pre- and postoperative first month distortion product otoacoustic emission (DPOAE) signal-to-noise ratio (SNR), bone conduction hearing levels and air bone gap (ABG) values were measured and total endoscope usage time was noted. RESULTS: Preoperative median SNR measurements at 0.5, 1, 2, and 4 kHz were 6 dB (1–11; interquartile range [IQR], 1), 6 dB (4–20; IQR, 1), 7 dB (3–26; IQR, 5) and 5.50 dB (0–9; IQR, 3), respectively. Postoperative median SNR measurements at 0.5, 1, 2, and 4 kHz were 6 dB (3–9; IQR, 1), 6 dB (2–21; IQR, 3), 7 dB (2–20; IQR, 3), and 6 dB (0–10; IQR, 7), respectively. Regarding the DPOAE measurements, there was no statistically significant difference between the SNR values of all given frequencies (P>0.05). Regarding the pure tone audiometry (PTA) measurements, bone conduction was significantly better at 0.5 and 1 kHz, postoperatively (P 0.05). Additionally, no statistically significant correlation was found between the SNR and PTA measurements and the endoscope usage time (P>0.05). CONCLUSION: We suggested that cochlear functions and sensorineural hearing remained stable after endoscopic transcanal cartilage tympanoplasty and cold light source doesn’t cause significant adverse effects cochlear functions.

Research on development of automatic color LED medical cold light source / 中国医学装备

According to the clinical needs, to meet the different requirements of users,to provide a kind of energy-saving, environmental,Protection, safety,reliable automatic color LED medical cold light source; using LED as light source medical cold light source, LED used red, yellow, green The three primary colors, with the three drive control; light intensity using the total luminosity regulation combined with red, yellow, green three primary color Festival; automatic regulation, tracking and artificial regulation combined. According to the camera, display and individual different regulating the best color,taking LED as the light source, using the total light intensity and color separation light (red light, yellow light, green light intensity detection), and can realize thetracking, to develop the automatic tracking set color and intensity automatic colorLED medical cold light source. Conclusion automatic color LED medical cold light source of safe use, reliable performance, energy saving and environmental protection; the different needs can be suitable for different users; and can realize automatic control and manual adjustment of light intensity and light intensity of the total.

Surgical treatment of calcified lumbar disc protrusion through a limited-incision under cold light source / 中国微创外科杂志

Objective To investigate curative outcomes of the limited-incision surgery under cold light source for treating calcified lumbar disc protrusion. Methods A total of 36 patients with calcified lumbar disc protrusion underwent limited-incision surgery under cold light visualization from January 2000 to June 2005. The patients were maintained at a prone position. The operation was carried out under local anesthesia. A longitudinal skin incision around 3 cm in length was made. After the inferior border of the vertebral plate and the intervertebral space were exposed, a lamina retractor was inserted above the superior border of the articular process. Then a fenestration and a discectomy were performed under cold light visulization. Results The operative time was 75.3?3.5 min and the intraoperative blood loss was 100.6?5.5 ml. Cerebrospinal fluid leakage occurred in 3 patients. All the 36 patients were followed for 6~60 months (mean, 27 months). Symptoms of low back pain, lower limb pain, and intermittent limping disappeared completely in all the 36 patients. According to the Nakai standard, the rate of excellent or good results was 94.4% ( 34/36 ). Conclusions Limited-incision surgery under cold light source for the treatment of calcified lumbar disc protrusion offers advantages of simplicity of performance, minimal invasion, and satisfactory outcomes.