Document Detail

Non-cladding optical fiber is available for detecting blood or liquids.
MedLine Citation:
PMID:  20697933     Owner:  NLM     Status:  In-Process    
OBJECTIVES: Serious accidents during hemodialysis such as an undetected large amount of blood loss are often caused by venous needle dislodgement. A special plastic optical fiber with a low refractive index was developed for monitoring leakage in oil pipelines and in other industrial fields. To apply optical fiber as a bleeding sensor, we studied optical effects of soaking the fiber with liquids and blood in light-loss experimental settings.
METHODS: The non-cladding optical fiber that was used was the fluoropolymer, PFA fiber, JUNFLON™, 1 mm in diameter and 2 m in length. Light intensity was studied with an ordinary basic circuit with a light emitting source (880 nm) and photodiode set at both terminals of the fiber under certain conditions: bending the fiber, soaking with various mediums, or fixing the fiber with surgical tape. The soaking mediums were reverse osmosis (RO) water, physiological saline, glucose, porcine plasma, and porcine blood. The light intensities regressed to a decaying exponential function with the soaked length.
RESULTS: The light intensity was not decreased at bending from 20 to 1 cm in diameter. The more the soaked length increased in all mediums, the more the light intensity decreased exponentially. The means of five estimated exponential decay constants were 0.050±0.006 standard deviation in RO water, 0.485±0.016 in physiological saline, 0.404±0.022 in 5% glucose, 0.503±0.038 in blood (Hct 40%), and 0.573±0.067 in plasma. The light intensity decreased from 5 V to about 1.5 V above 5 cm in the soaked length in mediums except for RO water and fixing with surgical tape.
CONCLUSIONS: We confirmed that light intensity significantly and exponentially decreased with the increased length of the soaked fiber. This phenomena could ideally, clinically be applied to a bleed sensor.
Akihiro Takeuchi; Tomohiro Miwa; Masuo Shirataka; Minoru Sawada; Haruo Imaizumi; Hiroyuki Sugibuchi; Noriaki Ikeda
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Publication Detail:
Type:  Journal Article     Date:  2010-08-10
Journal Detail:
Title:  Journal of clinical monitoring and computing     Volume:  24     ISSN:  1573-2614     ISO Abbreviation:  J Clin Monit Comput     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806357     Medline TA:  J Clin Monit Comput     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  363-70     Citation Subset:  IM    
Department of Medical Informatics, School of Allied Health Sciences, Kitasato University, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa 252-0373, Japan.
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