URINE SYSTEM, COLLECTION PUREWICK W/BATTERY The system with built-in lithium-ion battery protection keeps the system running in the event of a power outage. The PureWick™ Female External Catheters are sold separately in boxes of 30. The PureWick™ System is an innovative option to managing urinary incontinence. The PureWick™ Female External Catheter is used in over 2,000 hospitals and rehab facilities