scholarly journals A Novel Photoplethysmography Sensor for Vital Signs Monitoring from the Human Trachea

Biosensors ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 119 ◽  
Author(s):  
James M. May ◽  
Justin P. Phillips ◽  
Tracey Fitchat ◽  
Shankar Ramaswamy ◽  
Saowarat Snidvongs ◽  
...  
Keyword(s):  
Current Pulse ◽  
Pulse Rate ◽  
Printed Circuit Board ◽  
Vital Signs ◽  
Circuit Board ◽  
Monitoring Site ◽  
Vital Signs Monitoring ◽  
Flexible Printed Circuit ◽  
Human Trachea ◽  
The Mean

Current pulse oximeter sensors can be challenged in working accurately and continuously in situations of reduced periphery perfusion, especially among anaesthetised patients. A novel tracheal photoplethysmography (PPG) sensor has been developed in an effort to address the limitations of current pulse oximeters. The sensor has been designed to estimate oxygen saturation (SpO2) and pulse rate, and has been manufactured on a flexible printed circuit board (PCB) that can adhere to a standard endotracheal (ET) tube. A pilot clinical trial was carried out as a feasibility study on 10 anaesthetised patients. Good quality PPGs from the trachea were acquired at red and infrared wavelengths in all patients. The mean SpO2 reading for the ET tube was 97.1% (SD 1.0%) vs. the clinical monitor at 98.7% (SD 0.7%). The mean pulse rate for the ET sensor was 65.4 bpm (SD 10.0 bpm) vs. the clinical monitor at 64.7 bpm (SD 9.9 bpm). This study supports the hypothesis that the human trachea could be a suitable monitoring site of SpO2 and other physiological parameters, at times where the periphery circulation might be compromised.

scholarly journals Small Motion Detection and Non-Contact Vital Signs Monitoring with Continuous Wave Doppler Radars

2020 ◽  
Vol 26 (3) ◽  
pp. 54-60 ◽  
Author(s):  
Ibrahim Seflek ◽  
Yunus Emre Acar ◽  
Ercan Yaldiz
Keyword(s):  
Motion Detection ◽  
Printed Circuit Board ◽  
Continuous Wave ◽  
Vital Signs ◽  
Heart Beat ◽  
Circuit Board ◽  
Healthy Human ◽  
Small Motion ◽  
Continuous Wave Doppler ◽  
Vital Signs Monitoring

Radars have become devices that one can come across in any environment at any moment. This means that they enter to all areas of life and even in the field of medicine and will be used more intensively in the future. Especially, the attention has been drawn to that they are suitable for the non-contact vital signs monitoring. In this study, two radar structures operating at 24 GHz (Radar 1) and 2.4 GHz (Radar 2) frequencies are used. Radar 1 structure is created on a printed circuit board (PCB), whereas Radar 2 is obtained by combining discrete components. The 8.5 mm movement performed with the aid of a test mechanism is detected by two radars with percentage errors (PEs) of 2.58% and 6.23%, respectively. For the 0.25 Hz vibration frequency, the error is the same for both radars and is 2.4 %. In measurements taken from a healthy human subject, Radar 1 finds a respiration rate with 1.85 % of PE and heart beat rate with 6.17 % of PE. In Radar 2, these values are 2.35 % and 8.24 %, respectively. From the measurement results, it is seen that the resolution of Radar 1 is better than that of Radar 2. The results also indicate that small motion detection and vital signs monitoring are carried out successfully.

scholarly journals Flexible Printed Circuit Board as Novel Electrodes for Acoustofluidic Devices

2020 ◽  
pp. 1-6
Author(s):  
Chao Sun ◽  
Roman Mikhaylov ◽  
Yongqing Fu ◽  
Fangda Wu ◽  
Hanlin Wang ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit

Optimized Positional Compensation Parameters for Exposure Machine for Flexible Printed Circuit Board

2015 ◽  
Vol 11 (6) ◽  
pp. 1366-1377 ◽  
Author(s):  
Jinn-Tsong Tsai ◽  
Chorng-Tyan Lin ◽  
Cheng-Chung Chang ◽  
Jyh-Horng Chou
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit

Hybrid Fabrication of LED Matrix Display on Multilayer Flexible Printed Circuit Board

2021 ◽  
Author(s):  
Thanh Huy Phung ◽  
Jaehyeong Jeong ◽  
Anton Nailevich Gafurov ◽  
Inyoung Kim ◽  
Sung Yong Kim ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
Led Matrix

Superconducting Multilayer High-Density Flexible Printed Circuit Board for Very High Thermal Resistance Interconnections

2018 ◽  
Vol 193 (3-4) ◽  
pp. 578-584 ◽  
Author(s):  
Xavier de la Broïse ◽  
Alain Le Coguie ◽  
Jean-Luc Sauvageot ◽  
Claude Pigot ◽  
Xavier Coppolani ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Printed Circuit Board ◽  
High Density ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
High Thermal Resistance ◽  
Very High

scholarly journals A Diffusor/Nozzle Pump Based on a Magnetically Actuated Flexible PCB Diaphragm

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1077
Author(s):  
Marcus A. Hintermüller ◽  
Bernhard Jakoby
Keyword(s):  
Printed Circuit Board ◽  
Microfluidic Channel ◽  
Circuit Board ◽  
Fabrication Method ◽  
Flexible Membrane ◽  
Printed Circuit ◽  
Magnetically Actuated ◽  
Lorentz Forces ◽  
Out Of Plane ◽  
Flexible Printed Circuit

We present a valveless microfluidic pump utilizing an oscillating membrane made from a flexible printed circuit board. The microfluidic channel is fabricated by a 3D printing process and features diffuser/nozzle structures to obtain a directed flow; the flexible membrane is bonded to the channel. The membrane is actuated via Lorentz forces to accomplish out-of-plane motions and push the fluid through the channel. A permanent magnet provides the static magnetic field required for the actuation. The simple fabrication method can potentially be used for inexpensive mass fabrication for disposable devices.

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