I have been seeing more of this happening at my work. To avoid potential skin injury, never push or pull the purewick™ female external catheter against the skin during placement or removal. Purewick Female External Catheter Shop Purewick Catheter Purewick use, warnings, & precautions for ot. How does purewick catheter work . The purewick™ system is a urine collection system that works outside the body. Do not use the purewick™ urine collection system with purewick™ female external catheters on individuals with urinary retention. The device really works great for some but not for others. The purewick™ system is a urine collection system that works outside the body. Fecal collectors are covered by medicare when requirements are met. Used with a purewick catheter system to reduce risk of moisture lesions by wicking urine away from the body, external catheters are an alternative to incontinence pads and indwelling catheters for female patients. While the primary p...