Reference Manual - IARC Screening Group

Technical Overview of the Cryotherapy SystemFigure D-4. British and US Regulator FittingsChecking the Gas • When the regulator is connected to the gas cylinder, open the mainPressure 4 valve at the top of the cylinder by turning counterclockwise. If gas is leaking at point where the regulator attaches to the gascylinder, see Problem 1 (Appendix E, page E-1). If gas is leaking from the handle, see Problem 2 (Appendix E,page E-1). If gas is leaking from the hose, see Problem 3 (Appendix E, pageE-1). If gas is leaking from the regulator, see Problem 4 (Appendix E,page E-1).• Check the gas pressure on the regulator to ensure that the pressuregauge needle is within the green-shaded area, which represents thesafe operating range (40–70 kg/cm 2 for CO 2 and 40–50 kg/cm 2 forN 2 O). If the pressure gauge needle is in the red-shaded area, seeProblem 5 (Appendix E, page E-2). If the pressure gauge needle is in the yellow-shaded area, seeProblem 6 (Appendix E, page E-2). If there is a loud noise and gas escapes from the safety valve, seeProblem 7 (Appendix E, page E-2).Installing theCryotip 4Note: Before installing the cryotip, it is important to ensure that itwas appropriately processed after last use for infection prevention.For more information, see Post-Procedure Processing (page D-6).• Remove the protector tube to uncover the thin metal tube on the endof the probe (Figure D-5).• Screw the cryotip onto the end of the probe by turning it clockwise(Figure D-6). Tighten by hand only. Be careful not to over-tighten.4 This step should be performed at the beginning of the day and before each cryosurgical procedure.D-4 Cervical Cancer Prevention Guidelines for Low-Resource Settings