Origami-Inspired MiFi Sensor Tracks Vital Signs in Rats
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- MiFi is a foldable, minimally invasive bioelectronic sensor developed at Imperial College London that compresses for insertion through a tiny incision and expands beneath the skin into a 2.1 cm square patch just 0.3 mm thick.
- Selin Olenik's team tested MiFi on rats, where it continuously tracked heart rate, breathing rate, and body temperature at accuracy comparable to a wearable monitor strapped to the skin.
- MiFi is powered wirelessly via near-field communication — the same tech behind contactless payments — and uses an accelerometer to detect tiny chest movements that translate into heart and breathing readings.
- MiFi outperformed the comparison wearable on stability: the skin-mounted monitor intermittently produced non-realistic values, while the implant did not, according to Olenik.
- MiFi can access interstitial fluid surrounding cells, which holds biomarkers that correlate with those in the bloodstream — potentially enabling real-time tracking of metabolites, enzymes, drugs, and antibiotics that sweat-based sensors can't reliably pick up.
- Fırat Güder of Imperial College London called MiFi "the first foldable bioelectronic minimally invasive sensor," while Ravinder Dahiya of Northeastern University said the novelty lies in its folding and integration; both flagged the need for long-term safety data.
- Rats in the current study carried the implant for only about an hour, with minimal inflammation reported; the team's next step is longer-term animal studies before any human trials.
Why it matters: If MiFi clears longer-term safety testing, it could displace flaky skin-mounted wearables with a stable under-the-skin platform that also reads interstitial-fluid biomarkers — metabolites, enzymes, and drug levels that sweat monitors can't reliably capture — giving clinicians a continuous, blood-free metabolic window.
