Ingestible Sensing Capsule with Magnetic-Based Localization Using a Wearable Belt

Area of Science:

• Biomedical Engineering
• Gastroenterology
• Medical Devices

Background:

• Wireless ingestible sensing capsules offer valuable GI tract biochemical data.
• Accurate capsule localization is crucial but often lacking in current systems.
• Existing localization methods can be inaccurate or cumbersome for daily use.

Purpose of the Study:

• To introduce GISMO-LOC, a novel ingestible capsule for pH and oxidation-reduction potential sensing.
• To present a wearable magnetic transmitter belt for accurate capsule localization.
• To evaluate the capsule's biochemical sensing and localization performance.

Main Methods:

• In-vitro evaluation of biochemical sensors.
• Localization accuracy assessment in controlled conditions and using a robot for GI trajectory reconstruction.
• On-human evaluation during various daily activities.
• Wearable belt comfort assessment.
• Limited in-vivo validation in an animal model.

Main Results:

• In-vitro tests confirmed biochemical sensing functionality.
• Localization achieved a mean absolute error (MAE) of 5.7 mm in controlled conditions.
• GI trajectory reconstruction showed a 3.8 mm MAE.
• On-human localization errors were generally below 2-4 cm depending on activity level.
• Volunteers found the belt wearable for daytime use.

Conclusions:

• GISMO-LOC offers a novel, accurate solution for GI tract biochemical sensing and localization.
• The system enhances the value of ingestible capsule data by providing precise location information.
• GISMO-LOC is a promising tool for advancing GI tract research and diagnostics.