The PureWick external catheter should be replaced every 8 to 12 hours, according to BD, the manufacturer. It should also be changed immediately if it becomes soiled with feces or blood, regardless of how long it has been in place. That 8-to-12-hour window is the maximum, not a target. Many caregivers find that changing closer to the 8-hour mark keeps the skin drier and the device working more reliably.
Why the 8-to-12-Hour Window Matters
The PureWick is a soft, absorbent wick that sits against the body and uses low-level suction to draw urine away from the skin. Over time, the wick material becomes saturated, and its ability to move fluid decreases. Leaving a wick in place beyond 12 hours increases the risk of prolonged moisture contact with the skin, which can lead to irritation, redness, and eventually skin breakdown.
The device is single-use. You cannot rinse it out, dry it, or reapply it. Each change requires a fresh catheter.
When to Change It Early
The clock resets any time the wick is contaminated. If there is a bowel movement or any blood on the catheter, replace it right away. Beyond contamination, there are a few practical signs that the wick needs changing before the 8-hour mark:
- Leaking around the device. If urine is pooling on the bed or pad instead of being drawn into the tubing, the wick is likely saturated or has shifted out of position.
- Reduced or no suction flow. If the collection canister stops filling even though the pump is running, the wick may be clogged or too wet to function.
- The wick has moved. Rolling over, repositioning, or getting in and out of bed can shift the catheter. A misaligned wick won’t maintain proper contact, so it stops working and should be replaced and repositioned.
Checking Skin and Device Placement
BD and the FDA both recommend checking the device placement and the surrounding skin at least every 2 hours. This does not mean you need to change the wick every 2 hours. It means lifting the blanket, confirming the catheter is still in the correct position, and taking a quick look at the skin for redness or irritation.
Prolonged moisture against the skin, even low levels, can cause maceration, where the skin becomes soft, pale, and fragile. Catching early redness during a 2-hour check gives you a chance to change the wick, clean and dry the area, and prevent the irritation from progressing. If you notice persistent redness or broken skin that does not improve after a wick change and gentle cleaning, that warrants attention from a healthcare provider.
How Many Wicks You Need Per Month
The math depends on how many hours per day the device is in use. If you use the PureWick only at night (roughly 8 to 10 hours), one catheter per night is typical, which works out to about 30 wicks per month. If the device is used around the clock, you will go through 2 to 3 catheters per day, meaning 60 to 90 per month. Add a few extras each month for early changes due to contamination or shifting.
For overnight-only users, a 30-count supply is a reasonable monthly baseline. For 24-hour users, planning for at least 75 to 90 per month accounts for scheduled changes plus the occasional unplanned replacement.
Keeping the Collection System Clean
Changing the wick on schedule is only part of the routine. The collection canister, tubing, and pump connector also need regular attention. Empty the canister before it reaches capacity, as an overfull canister reduces suction and can cause urine to back up toward the wick. After emptying, rinse the canister with warm water. A mild soap or diluted vinegar rinse helps control odor buildup over time.
Check the tubing for kinks or blockages each time you change the wick. A kinked tube mimics a saturated wick, with the suction pump running but no urine flowing into the canister. Straightening the line usually solves the problem immediately.
Tips for Overnight Use
Most home users rely on the PureWick primarily for sleep. A fresh wick placed at bedtime and removed in the morning fits neatly within the 8-to-12-hour recommendation. If you tend to sleep longer than 10 hours or wake during the night, a quick position check at that point can extend the wick’s effective life while keeping the skin safe.
When removing the catheter in the morning, gently clean the skin with a mild cleanser and pat it completely dry before applying any barrier cream or getting dressed. Giving the skin time to air out between uses, even 15 to 20 minutes, helps reduce moisture-related irritation over time. This small daily habit makes a noticeable difference for people using the device every night.