Reference Manual - IARC Screening Group

APPENDIX ETROUBLESHOOTING WITH THECRYOTHERAPY SYSTEM 1This section is intended to guide the user in troubleshooting problemscommonly encountered when using the Model LL100 cryotherapysystem 2 (Wallach Surgical Devices, Inc.). Table E-1 describes signs oftrouble, explains the cause of each, and indicates an appropriate followupaction aimed at resolving the problem.Note: Solving some of the problems covered in this section requires theknowledge/skills of a technician trained in basic repairs andmaintenance of the cryotherapy system (which is beyond the scope ofthis manual). In such cases, whether it is better to repair the unit onsite,return it to the manufacturer for repairs, or replace the system altogetherdepends on the resources available at a given site.Table E-1. Following-Up on Commonly Encountered ProblemsPROBLEM1. Gas is leaking at thepoint where theregulator attaches tothe gas cylinder.2. Gas leaks from thehandle.POSSIBLEEXPLANATIONThe connection to thecylinder either is nottight enough or requiresa washer.May be caused by anynumber of problems(e.g., worn O-rings,broken inlet/ exhausttube, loose insulatortube).3. Gas leaks from thehose.The hose has a hole in it.(table continued on next page)APPROPRIATE ACTIONClose the main cylinder valve and remove the regulator.• If using a US fitting, re-attach the regulator to thegas cylinder and make sure the connection is tight(Figure D-3, page D-3).• If using a British fitting, place a new washer(Wallach Item #C18072) over the brass nipple andattach the regulator to the cylinder; tighten carefullyto avoid tearing (Figure D-3, page D-3).If qualified to perform basic repairs and maintenance,replace the O-rings (Wallach Item #107500), retainerseals (Wallach Item #200004), and valve cores (WallachItem #108519). Replace the spring (Wallach Item#111001) only as needed. If not qualified or problem not resolved, returnthe system to the manufacturer.Return the system to the manufacturer.1 Adapted from: Blumenthal P. 2004. The Model ll10 Cryotherapy System: An Operational and Use Guide to BasicRepair and Maintenance. JHPIEGO: Baltimore.2 In this manual, illustrations and instructions specifically related to the cryotherapy system/unit are based on the WallachLL100 Cryotherapy System (Wallach Surgical Devices, Inc., 235 Edison Road, Orange, CT 06477, USA.www.wallachsd.com). While the principles of cryotherapy are the same regardless of the system used, other systems maydiffer in appearance, operating features, and procedures for proper use.Cervical Cancer Prevention Guidelines for Low-Resource Settings E-1