A pill-sized ultrasound scanner, called the Sonopill, will travel through the gut to image and treat disease from the inside. Current capsule endoscopes—"pillcams" used by more than 1 million patients worldwide—can only record video of the gut lining. They cannot see beneath the surface or deliver therapy. Ultrasound, by contrast, can image tissue layers below the lining, perform focused surgery, and, in research, target drug delivery. The Sonopill programme aims to pack these capabilities into a capsule format, combining ultrasound with visual imaging for a more complete diagnosis. If successful, the Sonopill could give clinicians a non-invasive tool to detect and treat gastrointestinal conditions—such as tumours or bleeding—that current cameras miss. For patients, this means fewer invasive procedures like endoscopy. For the health system, it could lower costs by shifting diagnosis and some therapy to a simple swallowed capsule. The project also tackles fundamental engineering challenges in microelectronics, autonomous capsule positioning, and sensor design, which could advance medical robotics more broadly. The goal is for the UK to build a sustainable international lead in multimodality capsule endoscopy.
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Capsule endoscopy for medical diagnosis in the gastrointestinal (GI) tract has emerged only in the past 10 years. Now established in "pillcams", which have benefitted more than 1 m patients worldwide, it is a clear candidate for further innovation. Most capsule endoscopy devices record and transmit video data representing the visual appearance of the inside of the gut, but work has begun on other diagnostic techniques, such as the measurement of pH, and there has been some research into the use of capsules for treatment as well. Medical ultrasound imaging is a safe, inexpensive technique which can be applied in real-time at the point of care. Ultrasound is also capable of treatment through focused ultrasound surgery and, in research, for targeted drug delivery. The core of the Sonopill programme is the exploration of ultrasound imaging and therapeutic capabilities deployed in capsule format. This will be supported by extensive pre-clinical work to demonstrate the complementary nature of ultrasound and visual imaging, along with studies of multimodal diagnosis and therapy, and of mechanisms to control the motion of the Sonopill as it travels through the GI tract. This brings research challenges and opportunities in areas including ultrasound device and systems design, microengineering and microelectronic packaging, autonomous capsule positioning, sensor suites for diagnosis and intervention, and routes to translation into clinical practice. Our carefully structured but open-ended approach maximises the possibility to meet these research challenges while delivering for the UK a sustainable international lead in multimodality capsule endoscopy, to provide greater capabilities for the clinician, more acceptable practice for the patient population, and lower costs for economic wellbeing.
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