4.6 Article

Towards a Miniaturized 3D Receiver WPT System for Capsule Endoscopy

期刊

MICROMACHINES
卷 10, 期 8, 页码 -

出版社

MDPI
DOI: 10.3390/mi10080545

关键词

3D receiver; capsule endoscopy; phantom; power transfer efficiency; specific absorption rate

资金

  1. UK Engineering & Physical Sciences Research Council (EPSRC) through the programme grant entitled Sonopill [EP/K034537/2]
  2. Heriot-Watt University, under the International Doctoral Training Account (DTA)
  3. EPSRC [EP/K034537/2, 1948854, EP/K034537/1] Funding Source: UKRI

向作者/读者索取更多资源

The optimization, manufacturing, and performance characterization of a miniaturized 3D receiver (RX)-based wireless power transfer (WPT) system fed by a multi-transmitter (multi-TX) array is presented in this study for applications in capsule endoscopy (CE). The 200 mm outer diameter, 35 mu m thick printed spiral TX coils of 2.8 g weight, is manufactured on a flexible substrate to enable bendability and portability of the transmitters by the patients. The 8.9 mm diameter-4.8 mm long, miniaturized 3D RX-includes a 4 mm diameter ferrite road to increase power transfer efficiency (PTE) and is dimensionally compatible for insertion into current endoscopic capsules. The multi-TX is activated using a custom-made high-efficiency dual class-E power amplifier operated in subnominal condition. A resulting link and system PTE of 1% and 0.7%, respectively, inside a phantom tissue is demonstrated for the proposed 3D WPT system. The specific absorption rate (SAR) is simulated using the HFSSTM software (15.0) at 0.66 W/kg at 1 MHz operation frequency, which is below the IEEE guidelines for tissue safety. The maximum variation in temperature was also measured as 1.9 degrees C for the typical duration of the capsule's travel in the gastrointestinal tract to demonstrate the patients' tissues safety.

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