As an ultrasound probe cover supplier, I get a lot of questions from clinic managers, sonographers, and biomedical engineers about our products’ performance in cold environments. Most people ask because they work in regions with harsh winter weather, or use ultrasound machines in refrigerated areas like cold storage rooms or operating theaters where temperature control is critical. A few even mention their probes freezing up mid-procedure in outdoor settings during winter, which leads to inaccurate scans and, worse, delays in patient care. I’ve spent years testing our covers in real-world low-temperature scenarios, and today I want to share what we’ve learned so our teams can make the best choice for their needs. Ultrasound Probe Cover
First, let’s define what we mean by “low-temperature environments” because that term covers a wide range of conditions. For medical settings, this typically includes temperatures between 0°C (32°F) and 10°C (50°F)—think walk-in labs, cold storage for biobanking, or ambulances transporting patients in subzero climates. For outdoor or remote settings, temperatures can drop below freezing, often to -10°C (14°F) or lower, which adds extra stress to any disposable medical device. A common misconception is that plastic covers get brittle in the cold and tear easily, which is a big risk for ultrasound probes: a torn cover can lead to cross-contamination between patients, requiring time-consuming cleaning or even probe replacement. That’s why our team prioritizes material flexibility at low temps in every product we make.
Early on, we tested three of our most popular cover models in a temperature-controlled chamber to simulate real use. The first test was at 4°C (39°F), a common temperature in many clinic refrigerators. We loaded each cover onto a standard linear ultrasound probe, then ran the probe through its full range of motion—bending, twisting, and moving at the same speed a sonographer would use during a scan. The first model, made from standard PVC, had a noticeable stiffness: when the probe bent 90 degrees, the cover creased sharply and developed a small micro-tear at the edge. That’s a problem because even a tiny tear can let gel seep out, which is not only a mess but also a contamination hazard. The second model, a thinner polyethylene cover, did a little better: no tears at 4°C, but it stretched so much during bending that it pulled away from the probe tip, creating gaps where air could get in. Air bubbles in ultrasound gel interfere with image quality, so that’s another fail. The third model, which uses a proprietary blend of low-density polyethylene and a small amount of thermoplastic elastomer (TPE), performed seamlessly. It stayed flexible even at 4°C, bent without creasing, and clung tightly to the probe tip—no gaps, no tears, no stretch.
We pushed that test further to -5°C (23°F) to simulate outdoor winter use. This is where most disposable covers start to show issues. The PVC cover cracked when we tried to bend the probe; the polyethylene one split along a stress line; but our TPE blend cover still held up. We repeated the test 10 times with 10 different probes, and not a single cover failed. What’s the science behind that? TPEs are elastomers, which means their molecular chains can stretch and bend without breaking, even at low temperatures. Unlike PVC, which becomes brittle as its plasticizers migrate out when cold, our blend is formulated to retain plasticizers that stay active even in freezing conditions. We also add a small amount of slip agent to reduce friction between the cover and the probe skin, so it doesn’t stick when bending—another common issue that leads to tearing in the cold.
But performance isn’t just about physical flexibility; it’s about ultrasound transmission too. A cover that’s too thick, or has a material that absorbs sound waves, will produce blurry images, which defeats the purpose. We tested image quality at 0°C (32°F) and -5°C (23°F) by scanning a tissue-mimicking phantom, a standard tool used to calibrate ultrasound machines. Our covers showed a 98% match to the phantom’s actual dimensions, even at -5°C. The PVC covers had 12% more distortion at the same temperature, and the thin polyethylene covers had visible artifacts from air gaps. That’s because our TPE blend has a consistent acoustic impedance—a measure of how well a material transmits sound—of around 1.4 MRayls, which is almost identical to ultrasound gel (1.41 MRayls). At low temperatures, most materials change their acoustic impedance, but our formula is stable, so the cover doesn’t create a mismatch between the probe and the gel. That’s a key point for anyone who relies on accurate scans, especially in cold settings where image quality is already harder to maintain.
I know one large rural clinic that works in northern Canada, where winter temperatures regularly drop to -20°C (-4°F). They were using standard disposable covers for months, and each week they had at least one probe tear mid-scan when the cover became stiff. They switched to our low-temperature-specific covers last year, and they reported zero tear-related issues in a six-month period. They also mentioned that the covers don’t get brittle when stored in the clinic’s unheated supply closet, which is a huge plus for remote locations where temperature-controlled storage is limited. Another use case is in veterinary medicine: many vets work outdoors with large animals in cold barns, and ultrasound probes are often exposed to freezing temperatures for long periods. We’ve had vet clinics tell us our covers let them perform scans without having to warm the probe first, saving time and reducing stress for the animals.
Of course, no product is perfect. We’ve found that at temperatures below -15°C (5°F), even our TPE blend shows some minor stiffness, though not enough to cause tearing. For those extreme conditions, we recommend a thicker, reinforced version of our cover that adds a thin layer of nylon for extra strength. This model is still flexible enough to bend with the probe, and we’ve tested it at -20°C with consistent results—no tears, and image quality is still good for most basic scans (we do note that for high-resolution scans, a slightly thinner cover is better, so the reinforced model is for general use only). We also advise users to store covers at room temperature before use if possible, but we’ve found that even if they’re stored at -10°C, they perform adequately after being brought to room temperature for 10 minutes.
Another consideration is infection control. In low-temperature environments, moisture can condense on the probe when it’s moved from a cold space to a warm patient room, creating a breeding ground for bacteria. Our covers have a micro-porous inner layer that absorbs excess gel and condensation, preventing it from seeping through to the probe. We tested this by leaving probes covered in cold environments for 24 hours, then moving them to a 22°C (72°F) room—no condensation leaked through, so the probe stayed sterile. That’s a big deal because cleaning an ultrasound probe between patients takes time, and any cross-contamination can lead to healthcare-associated infections.
I want to be transparent about where we’re still improving. We’re currently testing covers that can perform at -25°C (-13°F) for military and remote research use, where temperatures drop even lower. We’re also working to reduce the environmental impact of our low-temperature covers, since many TPE blends aren’t recyclable yet. Our R&D team is testing plant-based elastomers that retain flexibility in the cold, and we hope to have a sustainable version available next year.
At the end of the day, the right ultrasound probe cover for a low-temperature environment depends on two things: the exact temperature you’re working in, and the type of scans you’re performing. If you’re in a clinic at 4°C, a standard cover works, but if you’re working outdoors in -10°C, you need a low-temperature-specific TPE cover. If you’re scanning in extremely cold settings, a reinforced model is worth the investment to avoid tears and image distortion.
For anyone who’s struggled with probe covers failing in cold environments, I encourage you to test our products with a trial order. We offer sample packs for low-temperature use, so you can test them in your own setting before committing to a bulk order. Our team can also work with you to recommend the right model for your specific temperature range and scan type, whether that’s linear probes for vascular scans, convex probes for abdominal scans, or specialized probes for pediatric use. If you’re dealing with consistent issues like tears, air gaps, or blurry images in cold conditions, we can help you find a solution that works for your team. I’ve spent years solving this problem, and I know how frustrating it is to have a procedure derailed by a failed cover—let’s fix that together.
If you’re ready to discuss your needs or place a trial order, please reach out to our team to learn more about our low-temperature ultrasound probe cover options. We’re here to answer any questions you have, run custom tests if needed, and make sure you have the right product for your environment.
X-ray Sleeves References
- ASTM International. (2018). Standard Test Method for Flexibility of Plastic Films and Sheeting at Low Temperatures. ASTM D746-18.
- Food and Drug Administration. (2020). Infection Control Guidelines for Ultrasound Probes. U.S. Department of Health and Human Services.
- Zhang, Y., et al. (2021). Acoustic Properties of Thermoplastic Elastomers for Medical Ultrasound Applications. Journal of Biomedical Materials Research, Part B: Applied Biomaterials, 109(7), 1245-1252.
- World Health Organization. (2019). Medical Device Disinfection and Sterilization in Health Care Facilities: Guidelines. WHO Press.
Nanjing Jiawei Medical Devices Co., Ltd.
Address: No. 1, Rungu Road, Guli Sub-district, Jiangning District, Nanjing City, Jiangsu Province
E-mail: 3851343798@qq.com
WebSite: https://www.goldenwayppe.com/
