4.7 Article

On the Use of Impedance Detuning for Gastrointestinal Segment Tracking of Ingestible Capsules

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 71, 期 2, 页码 1977-1981

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2023.3234374

关键词

Dipole antennas; Intestines; Impedance; Antenna measurements; Phantoms; Numerical models; Stomach; Conformal antennas; dipole antennas; impedance detuning; in-body; ingestible devices; in vivo applications

向作者/读者索取更多资源

This study investigates the possibility of using impedance detuning to detect the location of a capsule in the gastrointestinal tract. Antennas operating in the 433 MHz band are designed and validated through simulations and measurements. In the experimental model, a minimum phase change of around 10° was found, providing sufficient information to track the capsule's position in the GI tract.
During their travel through the gastrointestinal (GI) tract, ingestible antennas encounter detuning in their impedance response due to varying electromagnetic (EM) properties of the surrounding tissues. This communication investigates the possibility of using this impedance detuning to detect in which segment of the GI tract-stomach, small intestine, or large intestine-the capsule is located. Meandered dipole antennas operating in the 433 MHz industrial, scientific, and medical (ISM) band are designed for this purpose. The antennas conform to the inner surface of 3-D printed polylactic acid (PLA) capsules with a shell thickness of 0.6 or 0.4 mm. The impedance response is first optimized numerically in a homogeneous cylindrical phantom with time-averaged EM properties. The magnitude and the phase of the reflection coefficient are then obtained in different tissues and compared with simulations and measurements. The experimental demonstration is carried out first using tissue-mimicking liquids and then in a recently deceased ex vivo porcine model. The minimum change in the phase between different GI tissues was determined to be around 10?degrees in the porcine model, indicating that the changes in the impedance response, particularly the changes in the phase, provide sufficient information to follow the position of the capsule in the GI tract.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据