Wireless Passive Intracranial Pressure Sensor Based on a Microfabricated Flexible Capacitor

Wei, Qiuxu; He, Chaochao; Chen, Jian; Chen, Deyong; Wang, Junbo

doi:10.1109/ted.2018.2825247

Cited by 13 publications

(15 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Q. Wei et al microfabricated a flexible capacitive pressure sensor placed at the center of an inductor coil which can be implanted inside human brain for continuous real time monitoring of ICP. [ 235 ] The pressure sensor is characterized using air pressure setup for 0–10 kPa pressure range providing a plot of capacitance and frequency versus intracranial pressure. For real time ICP sensor characterization, L. Y. Chen et al fabricated flexible LC‐system for continuous in vivo monitoring of ICP [ 199 ] demonstrated by implanting the system in a mouse brain [Figure 12h].…”

Section: Applications Of Flexible Capacitive Pressure Sensormentioning

confidence: 99%

Recent Progress on Flexible Capacitive Pressure Sensors: From Design and Materials to Applications

Mishra

El‐Atab

Hussain

et al. 2021

Adv Materials Technologies

216

117

View full text Add to dashboard Cite

For decades, the revolution in design and fabrication methodology of flexible capacitive pressure sensors using various inorganic/organic materials has significantly enhanced the field of flexible and wearable electronics with a wide range of applications in aerospace, automobiles, marine environment, robotics, healthcare, and consumer/portable electronics. Mathematical modelling, finite element simulations, and unique fabrication strategies are utilized to fabricate diverse shapes of diaphragms, shells, and cantilevers which function in normal, touch, or double touch modes, operation principles inspired from microelectromechanical systems (MEMS) based capacitive pressure sensing techniques. The capacitive pressure sensing technique detects changes in capacitance due to the deformation/deflection of a pressure sensitive mechanical element that alters the separation gap of the capacitor. Due to advancement in state‐of‐the‐art fabrication technologies, the performance and properties of capacitive pressure sensors are enhanced. In this review paper, recent progress in flexible capacitive pressure sensing techniques in terms of design, materials, and fabrication strategies is reported. The mechanics and fabrication steps of paper‐based low‐cost MEMS/flexible devices are also broadly reported. Lastly, the applications of flexible capacitive pressure sensors, challenges, and future perspectives are discussed.

show abstract

Section: Applications Of Flexible Capacitive Pressure Sensormentioning

confidence: 99%

Recent Progress on Flexible Capacitive Pressure Sensors: From Design and Materials to Applications

Mishra

El‐Atab

Hussain

et al. 2021

Adv Materials Technologies

216

117

View full text Add to dashboard Cite

show abstract

“…The area of simple electronics sensing read-outs focuses on the sensing of physical quantities [34], such as temperature [35], mechanical pressure [36], acoustic pressure [37], electromagnetic field [38], humidity [39], gas [40], bio-signal [41], or capacity [42,43], etc. However, the detection and measurement of light and illuminance [44] received quite limited attention in recent works.…”

Section: Sensing Applications-a Brief Discussion Of the State-of-the-artmentioning

confidence: 99%

Design of Signal Generators Using Active Elements Developed in I3T25 CMOS Technology Single IC Package for Illuminance to Frequency Conversion

Šotner

Jeřábek

Polák

et al. 2020

Sensors

View full text Add to dashboard Cite

This paper presents a compact and simple design of adjustable triangular and square wave functional generators employing fundamental cells fabricated on a single integrated circuit (IC) package. Two solutions have electronically tunable repeating frequency. The linear adjustability of repeating frequency was verified in the range between 17 and 264 kHz. The main benefits of the proposed generator are the follows: A simple adjustment of the repeating frequency by DC bias current, Schmitt trigger (threshold voltages) setting by DC driving voltage, and output levels in hundreds of mV when the complementary metal-oxide semiconductor (CMOS) process with limited supply voltage levels is used. These generators are suitable to provide a simple conversion of illuminance to frequency of oscillation that can be employed for illuminance measurement and sensing in the agriculture applications. Experimental measurements proved that the proposed concept is usable for sensing of illuminance in the range from 1 up to 500 lx. The change of illuminance within this range causes driving of bias current between 21 and 52 μA that adjusts repeating frequency between 70 and 154 kHz with an error up to 10% between the expected and real cases.

show abstract

“…[ 23 ] Thus, they can be applied in situation where wired connect is difficult, like sealed environment, biomedical implants, and the field of Internet of thing. For example, for LC pressure sensors, lots of works have been done in detection of intracranial pressure, [ 24 ] intraocular pressure, [ 25–27 ] intravascular blood pressure, [ 28 ] blood flow, [ 21 ] and so on, making LC pressure sensor a hot research field.…”

Section: Introductionmentioning

confidence: 99%

Array Integration and Far‐Field Detection of Biocompatible Wireless LC Pressure Sensors

Wen

Chen

et al. 2021

Small Methods

View full text Add to dashboard Cite

In this paper, three configurations of LC (inductor–capacitor) pressure sensors are developed, namely series LC pressure sensors, compact LC pressure sensors, and far‐field LC pressure sensor tags. The modified silk protein films have been chosen as substrates due to their good biocompatibility and air/water permeability, which is suitable for continuously pasting such substrates on skin. For series LC pressure sensors, conducting wire is used to connect the flexible capacitor and spiral inductor. It exhibits good cycling stability and high sensitivities, suitable for electronic skin. For compact LC pressure sensors, the spiral coil functions as inductor, antenna, and capacitor electrode simultaneously, minimizing the space cost and is suitable for array integration, while the sensitivities remain the same. By tailoring the turn of the spiral coil, the resonate frequency can be regulated continuously. An annular array of compact LC sensors with ten distinct resonate frequencies ranged from 400 to 1000 MHz is developed to remotely monitor the press of number 0–9. Finally, far‐field LC pressure sensor tags with elongated detection distances are developed in which each compact LC sensor acts as a filter. A wireless in‐shoe plantar to detect the sole pressure distribution using the far‐field LC sensor configuration is developed.

show abstract

Wireless Passive Intracranial Pressure Sensor Based on a Microfabricated Flexible Capacitor

Cited by 13 publications

References 23 publications

Recent Progress on Flexible Capacitive Pressure Sensors: From Design and Materials to Applications

Recent Progress on Flexible Capacitive Pressure Sensors: From Design and Materials to Applications

Design of Signal Generators Using Active Elements Developed in I3T25 CMOS Technology Single IC Package for Illuminance to Frequency Conversion

Array Integration and Far‐Field Detection of Biocompatible Wireless LC Pressure Sensors

Contact Info

Product

Resources

About