News | June 04, 2008

Magnet-Controlled Camera Being Developed for Internal Body Imaging

June 5, 2008 - Images from inside the body can be made with tiny cameras a patient swallows, but until now doctors have not been able to steer or control them.

A new device being developed uses magnets to steer and can even deliver images of the esophagus.

In collaboration with engineers from the manufacturer Given Imaging, the Israelite Hospital in Hamburg and the Royal Imperial College in London, researchers from the Fraunhofer Institute for Biomedical Engineering in Sankt Ingbert have developed the first control system for the camera pill.

Images of the intestine are collected today using a camera pill that is no larger than a candy. It makes its way through the intestine and transmits images of the intestinal villi to an external receiver, which the patient carries on a belt. This device stores the data so that the physician can later analyze them and identify any hemorrhages or cysts. However, the camera is not very suitable for examinations of the esophagus and the stomach. The reason is that camera only takes about three or four seconds to make its way through the esophagus - producing two to four images per second – and once it reaches the stomach, its roughly five-gram weight causes it to drop very quickly to the lower wall of the stomach. Doctors say this is too fast to deliver usable images. For examinations of the esophagus and the stomach, therefore, patients still have to swallow a rather thick endoscope.

“In future, doctors will be able to stop the camera in the esophagus, move it up and down and turn it, and thus adjust the angle of the camera as required,” said IBMT team leader Dr. Frank Volke. “This allows them to make a precise examination of the junction between the esophagus and the stomach, for if the cardiac sphincter is not functioning properly, gastric acid comes up the esophagus and causes heartburn. In the long term, this may even cause cancer of the esophagus. Now, with the camera, we can even scan the stomach walls.”

To steer the device, researchers developed a magnetic device roughly the size of a bar of chocolate. The doctor can hold it in his hand during the examination and move it up and down the patient’s body and the camera inside will follow its motion, Volke said.

The steerable camera pill is constructed in much the same way as its predecessor with a camera, a transmitter that sends the images to the receiver, a battery and several cold-light diodes that briefly flare up like a flashlight every time a picture is taken. One prototype of the camera pill has already passed its first practical test in the human body. The researchers demonstrated in a self-experiment that the camera can be kept in the esophagus for about 10 minutes, even if the patient is sitting upright.

For more information: www.fraunhofer.de

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