Bioengineering aspects of sensors and instruments for continuous monitoring of a ventilated newborn

Rolfe, P.; Sun, Jinwei; Scopesi, F.; Serra, Giovanni

doi:10.1007/s12541-009-0008-1

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Since it produces large bending motion under low actuation voltage with good biocompatibility and resiliency, an IPMC beam has tremendous application in biomedical devices and biomimetic robotics. [2][3][4][5][6][7][8][9] Microfabrication of IPMC 10 has also been reported, which extends IPMC applications into the micro and nano manipulation domain.…”

Section: Introductionmentioning

confidence: 99%

Modeling of bending behavior of IPMC beams using concentrated ion boundary layer

Lughmani

Jho

Lee

et al. 2009

Int. J. Precis. Eng. Manuf.

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Ionic polymer metal composites (IPMCs) are an emerging class of electroactive polymers (EAP), which have many potential applications as sensors and actuators. Recently, IPMCs have been intensively studied because of their huge potential in medical, mechanical, electronic, and aerospace engineering. However, before the benefits of these materials can be effectively exploited for practical use, a mathematical model must be established to enhance understanding and predictability of IPMC actuation. The coupled electrical-chemical-mechanical response of an IPMC depends on the structure of the polyelectrolyte membrane, the morphology and conductivity of the metal electrodes, the cation properties, and the level of hydration. With this in mind, the purpose of this study is to establish a finite element model for bending behavior of IPMC beams. With reference to their operation principle, it is assumed that an IPMC beam has three virtual layers. We draw an analogy between thermal strain and real strain in IPMC due to volume change. This is a coupled structure/thermal model, and the finite element method is used to solve this model. The ion concentration distribution in the IPMC boundary layer is mimicked with the temperature distribution, and the electromechanical coupling coefficient is mimicked with the thermal expansion coefficient. Theoretical and experimental results demonstrate that our suggested model is practical and effective enough in predicting the blocking force of IPMC strips for different input voltages and strip thicknesses.

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Section: Introductionmentioning

confidence: 99%

Modeling of bending behavior of IPMC beams using concentrated ion boundary layer

Lughmani

Jho

Lee

et al. 2009

Int. J. Precis. Eng. Manuf.

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The effectiveness of oxygen conserving device of a demand oxygen delivery system based on FIO2 equivalency

Hwan

Kim

Shin

et al. 2011

Int. J. Precis. Eng. Manuf.

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Recently demand oxygen delivery (DOD) system has been preferred to continuous flow oxygen (CFO) method for long term oxygen therapy in patients with chronic obstructive pulmonary disease, since DOD system supplies oxygen during only inhalation and saves oxygen consumption. However, the oxygen saving ratio have not properly compared without considering fraction of inspired oxygen (FIO 2 ), though FIO 2 determines the efficacy of treatment. The purpose of this study was 1) to investigate the equivalence between the CFO method and a DOD system in terms of FIO 2 with considering dead space under various breathing parameters, 2) to propose and calculate the new effective oxygen saving ratio of the DOD method, 3) to compare FIO 2 obtained from calculation with that from experiment. The mathematical and experimental models of human respiratory system were developed. FIO 2 was calculated depending upon various breathing parameters and the new effective oxygen saving ratio was calculated to accurately compare oxygen saving consumption between the DOD and CFO method. Results of this study have shown that as supplied volume of oxygen increased, FIO 2 linearly increased. As beat per minute or tidal volume increased, FIO 2 decreased. The obtained FIO 2 between mathematical model and experiment showed errors less than 5% in CFO method and less than 11% in DOD method. Effective conserving oxygen ratios of the DOD system changed between 3.4 and 3.8, but had higher values when the volume of supplied oxygen was larger. In conclusion, CFO method had different equivalent values of FIO 2 depending on breathing parameters. Therefore it is appropriate to take into account of FIO 2 when considering performance of oxygen saving devices. The effective oxygen saving ratio proposed in this study may provide the new valuable index of oxygen saving of the DOD method while maintaining the same treatment effect compared with CFO method. In addition, the mathematical model developed in this study seems to predict FIO 2 similarly as obtained using experiment.

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Temperature Sensors Manufactured from Edible Materials Intended for Oral Cavity Operation

Stojanović

Radovanović

Kojić

et al. 2023

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Following the circular economy concept, all areas of science, including electronics, require individual approach. The green electronics approach implies processing natural based materials for development of electronic components even for single use, so that waste does not exist. This paper describes the production of thermistors from 3 different types of edible materials, their testing in laboratory conditions, as well as the application for measuring the temperature in the human oral cavity. To make the thermistor, three types of natural materials were used (carrageenan, polyvinyl alcohol and apple pomace-based). After fabrication, materials were poured into molds. Aluminium foil contacts were placed so that the electrical characterization of the materials could be performed. Several parameters were measured: resistance (R), impedance (Z) and the phase angle (θ) as a function of frequency. In order to determine whether the thermistors have a positive or negative temperature coefficient and to determine their sensitivity, measurements were conducted at three different temperatures: 25 ℃ (room temperature), 37 ℃ (human body temperature), and 50 ℃. The thermistors demonstrated negative temperature coefficient behaviour. Additionally, it was demonstrated that the apple pomace-based thermistor can successfully measure healthy volunteer's temperature. Graphical Abstract

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Bioengineering aspects of sensors and instruments for continuous monitoring of a ventilated newborn

Cited by 3 publications

References 22 publications

Modeling of bending behavior of IPMC beams using concentrated ion boundary layer

Modeling of bending behavior of IPMC beams using concentrated ion boundary layer

The effectiveness of oxygen conserving device of a demand oxygen delivery system based on FIO2 equivalency

Temperature Sensors Manufactured from Edible Materials Intended for Oral Cavity Operation

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