Highly sensitive optical sensor system for blood leakage detection

Ueda, Masahiro; Ishikawa, Kazuhiko; Chen, Jie; Mizuno, Sanae; Touma, Yasunori

doi:10.1016/0143-8166(94)90050-7

Cited by 5 publications

(6 citation statements)

References 2 publications

(1 reference statement)

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“…To prevent such accidents during hemodialysis, various sensors to detect blood leakage have been proposed [ 2 , 3 , 4 , 5 , 6 , 7 ]. Of these, a flexible sensor based on a film substrate fabricated using printing technology seems appropriate [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Nomura

Horii

Kanazawa

et al. 2018

Sensors

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We fabricate a wearable blood leakage sensor on a cotton textile by combining two newly developed techniques. First, we employ a screen-offset printing technique that avoids blurring, short circuiting between adjacent conductive patterns, and electrode fracturing to form an interdigitated electrode structure for the sensor on a textile. Furthermore, we develop a scheme to distinguish blood from other substances by utilizing the specific dielectric dispersion of blood observed in the sub-megahertz frequency range. The sensor can detect blood volumes as low as 15 μL, which is significantly lower than those of commercially available products (which can detect approximately 1 mL of blood) and comparable to a recently reported value of approximately 10 μL. In this study, we merge two technologies to develop a more practical skin-friendly sensor that can be applied for safe, stress-free blood leakage monitoring during hemodialysis.

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Section: Introductionmentioning

confidence: 99%

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Nomura

Horii

Kanazawa

et al. 2018

Sensors

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“…If another wavelength were used, that is, 630 nm, attenuation of light would be mainly due to scattering instead of absorption. [ 22 ]…”

Section: Resultsmentioning

confidence: 99%

“…If another wavelength were used, that is, 630 nm, attenuation of light would be mainly due to scattering instead of absorption. [22] The phototransistor (IF-D92, Industrial Fiber Optics) is set up as a simple voltage divider circuit with a 220 kΩ resistor in series. The output from the LED and phototransistor is connected to an Arduino Mega 2560 microcontroller.…”

Section: Control Circuitmentioning

confidence: 99%

“…[18][19][20][21] A majority of these systems require expensive, high-precision optical equipment such as lasers, spectrometers, and optical fibers embedded in the device. [19,22] Cytometers also rely on pressurized tubing systems for hydrodynamic flow focusing in microchannels. [23,24] Thus, these sensors are limited by their structural rigidity and cumbersome optoelectronic setup.…”

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confidence: 99%

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A Soft Sensor for Bleeding Detection in Colonoscopies

Gerald

McCandless

Sheth

et al. 2022

Advanced Intelligent Systems

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Colonoscopies allow surgeons to detect common diseases, that is, colorectal cancer, ulcers, and other ailments. However, there is a risk of bleeding in the lower gastrointestinal (GI) tract while maneuvering endoscopes. This may be due to perforations, hemorrhaging, polyps, diverticula, or post‐biopsy complications. Thus, it is essential for the surgeon to be able to detect bleeding at the site and evaluate the severity of blood leakage. Herein, a soft sensor that can detect the presence of blood at the bleeding site during colonoscopies is presented. The sensor consists of optical waveguides that interface with a microfluidic channel. Blood flow causes absorption and scattering of incident light that can be picked up by the optical sensing apparatus via light transmission through the waveguide. The surgeon can be alerted when bleeding occurs through a graphical user interface. The device is compact and measures only 1 mm thick. This allows the sensor to be circumferentially mounted onto a colonoscope at different locations. The sensor is able to record the presence of blood as an optical loss, rapidly detect the presence of blood under 100 ms as it enters the microchannel, and differentiate between gastric fluid and blood through changes in measured optical loss.

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“…This figure also implies the validation of eqn (3). thickness and the decrease in the transmitted light power, as shown in eqn (2). The light fluctuation due to ambient light introduces errors.…”

mentioning

confidence: 99%

Light attenuation in a semitransparent foam sheet—Thickness measurement for industrial use

Ueda¹,

Mizuno²,

Matsumura³

et al. 1996

Optics and Lasers in Engineering

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An optical method for measuring the thickness of heterogeneous materials has been studied. The method is based on the light attenuation theory. A complete system has been constructed in order to demonstrate the applicability of the present method for industrial use. The experimental setup consists of semiconductor lasers, focusing lenses, photo-diodes serving as a power meter and a personal computer with an AID converter for data acquisition. Averaging of numerous measurements is required in the present method because the heterogeneous cell

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Highly sensitive optical sensor system for blood leakage detection

Cited by 5 publications

References 2 publications

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

A Soft Sensor for Bleeding Detection in Colonoscopies

Light attenuation in a semitransparent foam sheet—Thickness measurement for industrial use

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