Purpose Telemetry capsules have existed since the 1950s and were used to measure temperature, pH or pressure inside the gastrointestinal GI tract. It was hoped that these capsules would replace invasive techniques in the diagnosis of function disorders in the GI tract. However, problems such as signal loss and uncertainty of the pills position limited their use in a clinical setting. In this paper, a review of the capabilities of microelectromechanical systems MEMS for the fabrication of a wireless pressure sensor microsystem is presented.Designmethodologyapproach The circuit requirements and methods of data transfer are examined. The available fabrication methods for MEMS sensors are also discussed and examples of wireless sensors are given. Finally, the drawbacks of using this technology are examined.Findings MEMS for use in wireless monitoring of pressure in the GI tract have been investigated. It has been shown that capacitive pressure sensors are particularly suitable for this purpose. Sensors fabricated for wireless continuous monitoring of pressure have been reviewed. Great progress, especially using surface micromachining, has been made in recent years. However, despite these advances, some challenges remain.Originalityvalue Provides a review of the capabilities of MEMS.
Sensor Review – Emerald Publishing
Published: Dec 1, 2005
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