Objective To evaluate the scavenging efficacy of a novel scavenger in removing isoflurane.Methods Forty five patients undergoing abdominal surgery were enrolled and randomly divided into three groups.The Datex-ohmeda S/5 anesthetic machine was applied to provide general anesthesia with isoflurane in group A,Datex-ohmed Aestiva/5 in group B,and Drager RA2S in Group C.After 60 minutes,the gas samples were taken at the waste gas outlet,airtake and airout of stripe tubes of anesthetic machines by Philips intellivue MP60 Anesthesia monitor to identify the concentrations of isoflurane and PCO2 both before and after the application of the scavenger.Results The novel scavenger could completely eliminate waste anesthetic gases including isoflurane and CO2.Conclusion The eliminating rate is 100% and the air quality in operating room is improved apparently.

Objective To learn the influence of PALL BB25S and Tyco Hygroboy breathing filter (BF) to Ppeak and Pmean. Methods The changes of Ppeak and Pmean were detected by using PALL BB25S and tyco Hygroboy in simulation ventila- tion. Results (1)When BFs (PALL or tyco, adult or child) were applied and Vt from 100ml/T to 800ml/T, the effect of breathing filter can be no significant changed, but Pmean was raised and Ppeak no change. (2)To compare the tyco BFs, the Pmean of child BF and adult BF, Pmean was significant increased. Conclusion Both of PALL BF and Tyco BF only significantly increase Pmean.

Studies show the waste anesthetic gas is harmful to the person working in operating room.At present,there are some problems in traditional scavengers and the gas absorber.This paper introduces a novel scavenger forwaste anesthetic gas which makes use of atmospheric pressure and negative pressure in operating room.This setting can scavenge the exhaust gas absolutely without affection the normal work of anaesthesia apparatus.