Microsystem Technologies

, Volume 23, Issue 12, pp 5397–5406 | Cite as

Characterization of basket-forceps-type micro-flow-sensor for breathing measurements in small airway

  • Naoaki Harada
  • Yoshihiro Hasegawa
  • Ryota Ono
  • Miyoko Matsushima
  • Tsutomu Kawabe
  • Mitsuhiro ShikidaEmail author
Technical Paper


We previously proposed a basket-forceps-type flow sensor, in which a flexible thermal flow sensor is mounted onto basket forceps to fix the flow sensor onto the inside surface of the airway. The basket-forceps-type flow sensor has an asymmetrical structure to prevent reciprocating airflow; thus, we investigated the characteristics of the basket-forceps-type flow sensor under both expired- and inspired-airflow conditions in this study. The thermal flow sensor was fabricated on a flexible polyimide film and mounted onto a guide tube of a basket-forceps. Two heaters and their electrical wiring patterns were designed to produce symmetric heat distribution over the heaters. The effects of the basket structure and guide tube on flow-rate measurement were experimentally evaluated, and it was confirmed that they did not affect sensor output. Conversely, sensor output decreased with the increase in tube diameter due to the reduction in the average flow velocity with the diameter increase. Thus, we carried out a procedure to construct a calibration curve under an arbitrary tube diameter. Finally, we applied the basket-forceps-type flow sensor in an animal experiment in which it successfully detected the breathing properties in the airway of a rat.


Chronic Obstructive Pulmonary Disease Tube Diameter Sensor Output Flow Sensor Guide Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This research was supported by The Canon Foundation and JSPS KAKENHI Grant Number 26286034, Japan.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Department of Frontier SciencesHiroshima City UniversityHiroshimaJapan
  2. 2.Department of Biomedical SciencesHiroshima City UniversityHiroshimaJapan
  3. 3.Department of Mechanical Science EngineeringNagoya UniversityNagoyaJapan
  4. 4.Department of Medical TechnologyNagoya UniversityNagoyaJapan

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