Gastrointestinal diagnostics: The Sonopill and AutoCapsule projects

Capsule endoscopy has revolutionized gastrointestinal tract diagnosis over the past decade. The Sonopill program, led by Professors Marc Desmulliez and Sandy Cochran, is at the forefront of integrating ultrasound imaging and therapy into capsule technology.

This innovative approach aims to enhance diagnostic capabilities, improve patient experience, and reduce healthcare costs through advanced engineering and multimodal technologies. In an interview with MEDICA-tradefair.com, Prof. Desmulliez and Prof. Cochran present the current state of research. 

Can you walk us through the initial inspiration and developmental challenges of the Sonopill?

Prof. Marc Desmulliez: The journey began with a critical look at conventional endoscopy. Prof. Cochran and I saw an urgent need to move away from invasive, tethered systems to something more patient-friendly. The idea for Sonopill originated over a decade ago, but initially, funding was a significant barrier.

After years of effort, we formed a multidisciplinary team, thanks to a substantial grant from our national funding body, the Engineering & Physical Sciences Research Council (EPSRC). This team, consisting of clinicians and engineers, allowed us to develop a prototype that really pushed the boundaries of what was technically possible at that time.

How does the Sonopill function, and what makes it innovative compared to traditional methods?

Desmulliez: Sonopill is a capsule that the patient swallows, which travels through the GI tract, taking pictures or videos not with a classical camera but with an array of ultrasound transducers. Initially, its function was restricted by battery life and camera frame rate, which dictated how much data we could collect. The major innovation, however, is in creating the array small enough so that it can be inserted into the capsule with is at most 1 cm diameter and 3 cm long.

With the advancements in AI, how significantly has the localization and diagnostic precision of the capsule improved?

Desmulliez: Another aspect of the work that researchers look at with classic endoscopic capsules is to use AI to facilitate the interpretation of optical images of the gut. AI has revolutionized how the collected data are analyzed post transit of the capsule. Previously, surgeons had to manually review hours of video footage to identify areas of interest. Now, AI algorithms can predict and pinpoint significant findings, reducing the workload and focusing on critical diagnostics, which streamlines the whole process.

Transitioning to AutoCapsule, can you describe how this project expands upon the groundwork laid by Sonopill?

Prof. Sandy Cochran: AutoCapsule is an evolution of Sonopill, funded by the EU Horizon 2020 program, focusing on diagnostic as well as therapeutic capabilities. While Sonopill was primarily diagnostic, ultrasound may also be used for targeted drug delivery systems within the capsule. This capability allows for localized treatment directly at the site of pathology, which is a significant step forward in personalized medicine. Additionally, we are exploring robotic enhancements that enable the capsule to be maneuvered within the gut via external controls, adding an unprecedented level of precision.

What are the specific technological advancements currently being developed in the AutoCapsule project?

Cochran: The current focus is on improving the electronic and mechanical aspects of the capsule to enhance its functionality and reliability. This includes developing custom application-specific integrated circuits and advancing magnetic manipulation techniques that allow us to control the movement and location of the capsule more accurately. These advancements are critical for both diagnostic and therapeutic functions, enabling us to attach the capsule in specific areas of the gut for extended monitoring or drug delivery.

With these innovative technologies still in development, what are the next steps towards clinical application?

Desmulliez: The path to clinical adoption involves rigorous testing and validation to ensure safety and efficacy. We are also working closely with regulatory bodies to navigate the approval process. Concurrently, we're refining our prototypes to ensure they meet the practical needs of medical practitioners and patients alike, focusing on ease of use, comfort, and effectiveness. External powering and localization of the capsule are also areas of research.