Origami-Inspired MiFi Implant Successfully Monitors Heart Rate, Respiration, and Temperature in Rats with High Accuracy

August 9, 2026

ZME Science UK

Overview

Researchers from Imperial College London and the University of Southern California have developed an origami-inspired implantable sensor, dubbed ‘MiFi,’ designed to unfold under the skin for health monitoring. In acute rat experiments, this implant demonstrated the ability to monitor heart rate, breathing rate, and temperature with accuracy comparable to commercial wearable sensors. MiFi also enables real-time monitoring of chemical markers in interstitial fluid, opening new possibilities for long-term health tracking, but requires further safety and reliability studies for human clinical application.

In Depth

Key Findings

Researchers from Imperial College London and the University of Southern California have developed an origami-inspired implantable sensor, named ‘MiFi’ (Minimally Invasive Foldable Implant), designed to unfold beneath the skin. In acute experiments conducted on rats, this innovative implant successfully demonstrated the ability to track key vital signs—heart rate, respiration rate, and temperature—with accuracy closely matching that of commercially available wearable sensors. MiFi also provides real-time monitoring of chemical markers within the interstitial fluid (ISF) including metabolites, enzymes, and therapeutic drugs, offering the potential for deeper, internal health insights that are challenging for traditional wearable sensors to obtain.

Technical and Clinical Details

The MiFi device is designed to be inserted beneath the skin in a folded state and then deploy into a flat configuration, much like origami. This ‘origami-inspired’ design allows for the placement of a relatively large sensor array within the body with minimal invasiveness during insertion. The device incorporates wireless communication capabilities and integrates both physical sensors for monitoring heart rate, respiration rate, and temperature, as well as electrochemical sensors for detecting chemical substances in the ISF. During acute rat experiments (approximately 1 hour of observation), the study confirmed that MiFi’s estimates of heart rate, breathing rate, and temperature closely correlated with data from commercial wearable sensors. It also demonstrated the effectiveness of ISF monitoring by detecting rising lithium levels. As interstitial fluid shares many biomarkers with blood, MiFi is anticipated to be a valuable tool for continuously monitoring diverse internal biological information, including drug concentrations, inflammatory markers, and infection biomarkers. However, at this stage, the device is not yet ready for long-term human use, requiring further rigorous studies on biocompatibility, long-term reliability, material durability, and sterilization protocols.

Background and Industry Context

The healthcare industry has a growing need for minimally invasive or non-invasive continuous vital sign and biomarker monitoring, driven by the increasing demands of chronic disease management, personalized medicine, and remote patient monitoring. Current wearable devices are primarily limited to surface measurements, making it difficult to directly measure deep tissue or the chemical composition of interstitial fluid. Implantable sensors hold the promise of providing more accurate and stable bio-data, but their invasiveness and the need for surgical insertion have been challenges. Origami-inspired designs like MiFi attempt to minimize insertion invasiveness while maximizing the benefits of implantable sensors (continuity, stability). This represents a novel approach to combining miniaturization with functionality, pushing the frontiers of medical technology.

Strategic Significance and Outlook

The MiFi technology has the potential to aid in the early detection of chronic diseases such as heart conditions, kidney disease, and diabetes, and to continuously monitor drug concentrations in the bloodstream. Specifically, the ability to track chemical markers in real-time will optimize personalized treatment plans for patients and enable earlier detection of adverse effects. Future work will involve preclinical and clinical trials in humans to validate long-term biocompatibility, device stability, reliability of data transmission, and the potential for bio-powered energy harvesting. If these challenges can be overcome, MiFi could become a groundbreaking implantable device that improves patients’ quality of life and contributes to the overall efficiency of healthcare systems.

Source: https://www.zmescience.com/science/news-science/this-origami-implant-unfolds-under-the-skin-to-monitor-health/

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