The PocketStrainer Kidney Stone Strainer
Catch and collect your stone for analysis — discreet, collapsible, and always in your pocket when it matters. Designed by an engineer and fellow kidney stone patient, in collaboration with medical professionals.
- USA-designed & family-owned
- Medical-grade silicone funnel + 316 stainless mesh
- Manufactured in an FDA-registered facility
- Folds flat to just 3/8 inch — pocket-sized & discreet
- Works discreetly for both men and women
- Reusable & dishwasher safe
- 4.6★ from 121 reviews on Amazon
- Amazon Prime eligible · 30-day returns
“This is way better than the paper ones you get from the hospital.”— Verified Amazon reviewView on Amazon →
Secure checkout on Amazon.com · Free 1–2 day delivery with Prime.
Or buy direct from us — free fast US shippingUSA Developed & Owned
Passing a kidney stone? What to do right now
- Strain every urination. Stones can pass at any time — often with surprisingly little warning. Urologists recommend straining all urine from the moment pain starts until your doctor confirms the stone has passed.
- Catch the stone — don’t lose it to the toilet. A fine 400-micron mesh catches even small fragments while still allowing urine to pass through freely.
- Store it. Keep the stone somewhere clean and dry until your appointment — a small pill bottle works well.
- Bring it to your urologist for composition analysis. This is the whole point: lab analysis tells you whether your stones are calcium oxalate, uric acid, struvite, or cystine — and that determines the diet, hydration, and medication plan that prevents the next one. Without the stone, your doctor is guessing.
Roughly half of people who pass a first kidney stone will form another within 5–10 years — which is why catching this one for analysis matters more than it feels like it does mid-emergency.
How the PocketStrainer works
Fine enough to catch fragments
The 40-mesh (400-micron) stainless filter catches small stones and gravel that coarser kitchen strainers miss. Small fragments matter — they analyze just as well as large stones.
Materials chosen for the job
Mill-certified 316L stainless steel mesh (the marine/medical grade — more corrosion-resistant than the 304 used in most strainers) and a BPA-free, medical-grade silicone funnel — silicone tested to ISO 10993-5 (cytotoxicity) and 10993-23 (irritation) biocompatibility standards. Made in an FDA-registered facility; FDA-listed Class I device (510(k) exempt). Multiple patents pending.
Built to be with you when it happens
Stones don’t wait for you to get home. PocketStrainer folds flat to 3/8 inch and looks like an everyday compact item — pocket, purse, glovebox, or travel kit — so you can strain discreetly in any restroom. Rinse, fold, repeat; dishwasher-safe when you’re home.
Deep dive: clinical research & design basis · meet the founder · instructions for use · customer reviews
Choose where to buy — same product, same guarantee
Amazon
The fastest option if you need it now — most customers choose Prime delivery during active stone passage.
View on Amazon →Buy direct
Straight from our small family team — single or 2-pack (one for home, one for your bag).
Buy on PocketStrainer.shop →30-day money-back guarantee everywhere. Discreet, unbranded packaging — no mention of medical use on the outside.
Common questions
Will it catch small kidney stones?
Yes — the ultra-fine 40-mesh (400-micron) stainless steel filter is designed to catch even small kidney stones and fragments that might otherwise be missed.
Is this an FDA-registered device?
Yes — PocketStrainer is a Class I medical device listed with the FDA and manufactured in an FDA-registered facility in accordance with FDA guidelines. (FDA registration/listing does not denote FDA approval or endorsement.)
How do I clean it after use?
Rinse under running water with mild soap if needed. For deeper cleaning it’s dishwasher safe (top rack recommended). Air-dry before folding it away.
Is it discreet?
Yes. It folds flat to under half an inch and looks like a compact everyday item, not a medical device — and it ships in discreet, unbranded packaging.
Do I still need this if the hospital gave me a strainer?
Hospital-issued strainers are usually bulky paper cones meant for a bedside. PocketStrainer is compact and reusable, built for the reality that stones usually pass when you’re at work, driving, or traveling — not conveniently at home.
Should I get more than one?
Many customers choose the 2-pack — one at home, one in a bag or travel kit — especially during active stone passage.
What if it doesn’t work for me?
30-day money-back guarantee. If you’re not satisfied for any reason, return it for a full refund.
