Related Experiment Video
Updated: Jan 14, 2026
Multimodality Diagnosis of Mesenteric Ischemia
Published on: July 21, 2023
An ingestible capsule for luminance-based diagnosis of mesenteric ischemia
J Chen1,2, A Alexiev2, A Sergnese2
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
Abstract:
Acute mesenteric ischemia (AMI) results from insufficient blood flow to the intestines, leading to tissue necrosis with high morbidity and mortality. Diagnosis is often delayed because of nonspecific symptoms that mimic common gastrointestinal conditions. Current diagnostic methods, such as computed tomography and mesenteric angiography, are complex, costly, and invasive, highlighting the need for a rapid, accessible, and minimally invasive alternative. Here, we present FIREFLI (finding ischemia via reflectance of light), a bioinspired, ingestible capsule designed for luminance-based diagnosis of AMI. Upon ingestion, the device activates in the small intestine's pH environment, emitting pulses from three radially spaced white light-emitting diodes and measuring reflected light across 10 wavelengths. FIREFLI then computes a tissue luminance biomarker, which outperforms color-change biomarkers because of superior intrasubject consistency. The diagnosis is processed onboard and wirelessly transmitted to an external mobile device. In vivo studies in swine (n = 9) demonstrated a diagnostic accuracy of 90%, with a sensitivity of 98% and specificity of 85%. By providing a noninvasive, real-time diagnostic solution, FIREFLI has the potential to facilitate earlier detection and treatment of AMI, ultimately improving patient outcomes.
Insights
A new ingestible capsule, FIREFLI, offers a rapid, minimally invasive way to diagnose acute mesenteric ischemia (AMI). This innovative device uses light reflectance for early detection, potentially improving patient outcomes for this critical condition.
Area of Science:
- Biomedical engineering
- Gastroenterology
- Medical diagnostics
Background:
- Acute mesenteric ischemia (AMI) is a critical condition with high mortality, often diagnosed late due to non-specific symptoms.
- Current diagnostic tools like CT scans and angiography are invasive, costly, and complex, necessitating better diagnostic methods.
Purpose of the Study:
- To introduce FIREFLI, an ingestible capsule for rapid, minimally invasive, and accessible diagnosis of AMI.
- To evaluate the efficacy of FIREFLI in detecting AMI using light reflectance and a novel luminance biomarker.
Main Methods:
- Development of FIREFLI, a bioinspired ingestible capsule that activates in the small intestine.
- The capsule emits light and measures reflectance across 10 wavelengths to compute a tissue luminance biomarker.
- Onboard processing and wireless transmission of diagnostic data to an external device.
Main Results:
- In vivo swine studies (n=9) showed FIREFLI achieved 90% diagnostic accuracy for AMI.
- The device demonstrated high sensitivity (98%) and specificity (85%) in detecting the condition.
- The luminance biomarker showed superior intrasubject consistency compared to color-change biomarkers.
Conclusions:
- FIREFLI offers a noninvasive, real-time diagnostic solution for AMI.
- The technology has the potential to enable earlier detection and treatment of AMI, improving patient outcomes.
- This bio-optical approach represents a significant advancement in diagnosing gastrointestinal emergencies.
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