Measurement and analysis of dissolved oxygen in circulating water of electromagnetic extracorporeal shock wave lithotripter
10.7687/j.issn1003-8868.2017.10.079
- VernacularTitle:电磁式体外冲击波碎石机循环水溶氧质量浓度的测量与分析
- Author:
Shi-Hong MA
1
;
Guang-Qing LI
;
Yuan-Lin YU
;
Gang LI
;
Ming CHEN
Author Information
1. 深圳市慧康医疗器械有限公司
- Keywords:
extracorporeal shock wave lithotripter;
circulating water;
dissolved oxygen concentration;
vacuum degassing membrane;
dissolved oxygen meter
- From:
Chinese Medical Equipment Journal
2017;38(10):79-82
- CountryChina
- Language:Chinese
-
Abstract:
Objective To measure the maximum dissolved oxygen concentration of the lithotripter to avoid visible air bubbles during lithotripsy.Methods The present situation of degassing of lithotripter and clinical requirements for water were introduced.Under the following conditions of 7.5 L water capacity,35 L/h water flow,ambient temperature 28 ℃,17 kV,60 shocks per minute,the lithotripter discharged 10 000 shocks continuously without a visible air bubble in the circulating water,then the dissolved oxygens in the water were measured by using AZ8403 dissolved oxygen meter.The maximum value of dissolved oxygen in the water was determined therefore without a visible air bubble.Results The visible tiny air bubble emerged during lithotripsy if the dissolved oxygen in the water was above 3.37 mg/L and ambient temperature was about 28 ℃;the bubble could be avoided if the dissolved oxygen was under 3.34 mg/L and ambient temperature was about 28 ℃.Conclusion The circulating water with dissolved oxygen concentration less [han 3 mig/L and about 28 ℃ ambient temnperature are recommended for the electromagnetic extracorporea] shock wave lithotripter during lithotripsy.