Transient Electronics in Healthcare

Introduction to Transient Electronics in Healthcare

Transient electronics are devices built to work inside the body for a set period and then dissolve or be resorbed. The founding demonstration came in 2012, when Hwang and colleagues reported a silicon chip technology that disappears in a controlled way and showed a version of it working under the skin of a rat [1]. The draw is simple. A device that resorbs never needs a second surgery to take it out [2].

For glucose monitoring, the appeal is easy to picture. The authors of a 2023 study on dissolving glucose sensors pointed out that today's semi-implantable sensors can cause infection and pain when they are removed [5]. A sensor that resorbs would also leave nothing to throw away, a problem we cover in our article on the environmental impact of disposable CGM electronics. All of this is still laboratory work: the dissolving glucose sensor we read about was tested in rats [4][5], and as of October 2026 a ClinicalTrials.gov search for a bioresorbable glucose sensor returned no registered studies [7].

Key Technical Components

Three kinds of material do most of the work:

• Semiconductors: Silicon nanomembranes (Si NMs) are sheets of single-crystal silicon only tens of nanometers thick. In water or body fluid they hydrolyze into ortho-silicic acid, Si(OH)4 [1]. Cell and animal studies of these membranes found them biocompatible and bioresorbable [6].
• Conductors: The 2012 devices used magnesium (Mg) for their wiring [1]. A follow-up study measured how thin films of several metals, molybdenum (Mo) among them, dissolve in water and simulated body fluid. Thin films turned out to dissolve at rates that can differ a lot from the corrosion rates reported for the same metals in bulk [3]. Molybdenum forms an oxide layer that breaks down into molybdate ions over weeks or months [4].
• Substrates: The base layer sets much of a device's lifespan. Silk fibroin, the protein that makes up silk, is attractive because its solubility in water can be tuned over several orders of magnitude by controlling how crystalline it is [1]. PLGA, short for poly(lactic-co-glycolic acid), served as the base of the 2023 dissolving glucose sensor [4].

Mechanism of Action

What follows is a research concept, not a working product, and its parts come from separate laboratory studies. In the concept, the sensor carries no battery. An external reader powers it through near-field coupling, the same physics behind NFC (near-field communication). The 2012 work showed that dissolvable coils can pick up power this way from an externally powered coil [1]. Real devices haven't closed the gap yet. The 2023 dissolving glucose sensor sent its signal to an external, battery-powered wearable module, and a 2024 dissolving brain implant relied on an NFC module that did not itself dissolve [4].

The concept then places the sensor under the skin, where a biodegradable enzyme layer would measure glucose. Here's the closest experiment we found: a printed sensor made of PLGA, molybdenum and zinc tracked glucose in the tissue under the skin of rats for 5 days, 2 hours a day, and then fully degraded within 2 months [4][5]. "Dissolves completely" needs care, too. The 2012 demonstration devices disappeared entirely [1], yet a 2025 review lists the buildup of degradation products during long-term use as a possible complication [4].

Challenges and Future Directions

The hardest problem is programmed dissolution. A sensor has to keep working through its whole sensing window and only then break down. Water makes this difficult, because it seeps in and changes the materials while the sensor is still reporting, which shows up as signal drift. In the 2023 glucose sensor, the response during a glucose tolerance test in rats fell by 34.91% on day 3 and 72.76% on day 5; a 2025 review concluded that the built-in correction wasn't enough for long-term tracking without changes to the materials themselves [4]. That correction was substantial. The team added a molybdenum-tungsten reference electrode for a stable baseline, plus extra electrodes to measure drift from temperature and degradation [5][4].

Encapsulation, a protective outer coating, is the other main lever. In the 2012 work, covering magnesium traces with layers of magnesium oxide or silk delayed their dissolution, with lifetimes adjustable from minutes to several days [1]. The control exists. Holding glucose readings steady for a full sensor wear period, then letting go on schedule, is the part a 2025 review still describes as unsolved [4].

Conclusion

Dissolving electronics would take two steps out of CGM use: pulling the sensor out and throwing it away. The materials behave as designed in the lab [1], and a dissolving glucose sensor has worked in rats for 5 days [5]. What's missing is evidence that such a sensor stays accurate for a full wear period, and we found no registered study in people [7]. Those are the results we'll be watching for.