Regulatory Frameworks for Medical E-Waste Recycling

Introduction to Regulatory Frameworks for Medical E-Waste Recycling

A used CGM sensor is two kinds of waste at once. It is a small battery-powered electronic device, and it is a medical device that has spent days under the skin. Recycling rules were written for the first kind and infection-control rules for the second, and in practice most sensors end up in general household waste [1]. The European Union is pushing manufacturers toward recycling and removable batteries [2] [3]. In the United States, sensors used at home mostly fall outside medical-waste rules; local trash and sharps programs decide where they go [4] [5].

What a used sensor contains

In 2024 a German team took apart 24 used sensors from three models: the FreeStyle Libre 2, the FreeStyle Libre 3 and the Dexcom G7 [1]. Abbott has since retired the first two. Libre 2 and Libre 3 sensors were available only through September 30, 2025, and the Libre 2 Plus and Libre 3 Plus sensors replaced them [6]. Every sensor held a plastic case, a circuit board and a battery. The Libre sensors ran on silver oxide button cells; the G7 used a CR1216 coin cell [1].

Per sensor, the amounts are tiny. Scaled to an estimated 230 million sensors used worldwide each year, the authors calculated about 580 tons of discarded sensors annually, including roughly 110 tons of batteries, on top of about 20,000 tons of packaging, applicators and leaflets [1]. Here's what surprised us: the hardest part was physical. Adhesives made the parts difficult to separate, and with the G7 a complete separation was nearly impossible [1]. Our article on the environmental impact of disposable CGM electronics covers the materials in more depth.

Why a sensor is hard to classify

Medical devices can become infectious during use. The risk comes mainly from body fluids on the device, and batteries from devices that touched patients are generally not considered infectious waste themselves [2]. The catch is that nobody can reach the battery without breaking the sensor open. In glucose sensors the disposable battery is soldered onto the circuit board and embedded in the plastic housing, partly so the sensor stays water resistant in the shower [2]. Recycling one means shredding it and mechanically sorting the pieces, leaving a "black mass" of battery electrode material that a metallurgical plant can process further [2].

Labeling reflects the split. Dexcom's G7 user guide notes that regions set different requirements for disposing of electronics (the receiver and sensor) and of parts that have touched blood or other body fluids (the applicator and sensor), and tells users to follow local guidelines [7]. The sensor appears on both lists.

European Union: producer responsibility and battery rules

The EU puts much of the recycling burden on manufacturers. Under the Waste Electrical and Electronic Equipment (WEEE) Directive, 2012/19/EU as revised by 2024/884/EU, medical device makers are responsible for recycling their electrical products and must register for a WEEE number [1] [2].

Batteries have their own law. The EU Battery Regulation (2023/1542) took effect on February 18, 2024; along with registration and labeling duties, it covers the take-back of waste batteries and producers' responsibility for collecting and recycling them [1] [2]. A 2026 letter in the Journal of Diabetes Science and Technology describes its Article 11 as requiring batteries in most medical devices to be "readily removable" and replaceable by end users or independent professionals at the end of a product's service life [3]. Exemptions exist, for example for waterproof medical devices, but each needs a documented safety or technical justification [3]. A sealed, waterproof CGM sensor sits right at that line, and we did not find a source saying whether any current sensor has claimed an exemption.

Redesign is slow even when the will is there. Under the EU Medical Device Regulation (MDR) 2017/745 and the ISO 13485 quality standard, a change to a device's materials or packaging means repeating validation work such as biocompatibility and sterility testing [8]. The authors of that commentary knew of no recycled medical-grade plastic available for Class II devices [8].

United States: a local patchwork

US rules depend on where the waste is created. A 2011 analysis described the split: medical waste from hospitals and clinics was tightly regulated and was autoclaved and landfilled or, in some regions, incinerated [4]. Home-generated medical waste, from needles and lancets to CGM insertion devices, was not regulated and usually went out with the curbside trash [4]. The FDA's consumer guidance today says sharps disposal programs vary by community, with options such as drop-off sites and mail-back programs [5].

Federal rules apply mainly to the battery. The EPA regulates lithium battery disposal under the Resource Conservation and Recovery Act (RCRA) and classes most spent lithium-ion batteries as hazardous waste that can be managed under streamlined "universal waste" rules [2]. Shipping lithium batteries for disposal or recycling falls under the Department of Transportation's Hazardous Materials Regulations, 49 CFR Parts 171 to 180 [2]. Unlike the EU, the United States has no universal requirement that medical device batteries be removable [3]. The fire hazard depends on chemistry: crushing a lithium-ion battery can cause a fire and thermal runaway, which a silver-zinc cell does not [2].

Take-back and collection in practice

Collection programs exist, but few are built around CGM sensors. France's DASTRI program collects medical waste from patients who treat themselves at home, including medical device batteries, and French rules require certain insulin pumps, such as patch pumps, to be recycled [2]. Swiss municipalities each run a collection point that accepts batteries and electronic devices, medical devices included [1]. In the United States, battery recyclers such as Call2Recycle offer drop-off or mail-in services for lithium-ion batteries, including those from health care settings [2].

Economics set the limits. Recyclers accept battery waste only in sufficient quantity, and material that falls short ends up in landfill [2]. Silver oxide cells are worth recycling because pure silver remains after discharge; other chemistries pay far less, and some lose money [2]. When a battery can't be removed, the whole used device has to move under hazardous-goods rules, which adds cost and compliance work [3].

People who use sensors want better options. In a German study published in 2024, 80 insulin-treated patients saved all of their diabetes waste for three months, including 630 glucose sensors [9]. Afterward, 91% said they wanted companies to offer disposal or recycling options for glucose sensors and pens. The share who said they took sensors to battery collection points rose from 13% to 84% [9]. A 2025 commentary notes that some companies already run take-back programs for used devices or packaging, without naming any for CGM sensors [8].

What is still unsettled

The open questions are mostly about design. If sealed sensors are redesigned around removable batteries, the EU rules gain something to recover; if they are exempted as waterproof medical devices, recycling one still means shredding the whole sensor [2] [3]. Collection also has to reach the volumes recyclers need [2]. Until either happens, the instruction in the Dexcom G7 user guide, to follow local guidelines, is the working rule for most people who wear a sensor [7].