Assembly of multiple chips on flexible substrate using anisotropie conductive film for medical imaging applications

2014 ◽  
Author(s):  
Hoang-Vu Nguyen ◽  
Trym Eggen ◽  
Bjornar Sten-Nilsen ◽  
Kristin Imenes ◽  
Knut E. Aasmundtveit
Keyword(s):  
Medical Imaging ◽  
Flexible Substrate ◽  
Conductive Film

Fabrication, Packaging, and Catheter Assembly of 2D CMUT Arrays for Endoscopic Ultrasound and Cardiac Imaging

2015 ◽  
Author(s):  
Azadeh Moini ◽  
Amin Nikoozadeh ◽  
Jung Woo Choe ◽  
Butrus T. Khuri-Yakub ◽  
Chienliu Chang ◽  
...  
Keyword(s):  
Medical Imaging ◽  
Optical Fibers ◽  
Flip Chip ◽  
Focused Ultrasound ◽  
Imaging System ◽  
Photoacoustic Imaging ◽  
Flexible Substrate ◽  
3D Ultrasound ◽  
High Intensity Focused Ultrasound

Ultrasound is increasingly in demand as a medical imaging tool and can be particularly beneficial in the field of intracardiac echocardiography (ICE). However, many challenges remain in the development of a 3D ultrasound imaging system. We have designed and fabricated a quad-ring capacitive micromachined ultrasound transducer (CMUT) for real-time, volumetric medical imaging. Each CMUT array is composed of four concentric, independent ring arrays, each operating at a different frequency, with 128 elements per ring. In this project, one ring will be used for imaging. A large (5mm diameter) lumen is available for delivering other devices, including high intensity focused ultrasound transducers for therapeutic applications or optical fibers for photoacoustic imaging. We address several challenges in developing a 3D imaging system. Through wafer vias are incorporated in the fabrication process for producing 2D CMUT arrays. Device integration with electronics is achieved through solder bumping the arrays, designing a flexible PCB, and flip chip bonding CMUT and ASICs to the flexible substrate. Finally, we describe a method for integrating the flex assembly into a catheter shaft. The package, once assembled, will be used for in-vivo open chest experiments.

Amorphous selenium photodetector on a flexible substrate for indirect conversion medical imaging

2012 ◽  
Author(s):  
Shiva Abbaszadeh ◽  
Shaikh H. Majid ◽  
Nicholas Allec ◽  
Karim S. Karim
Keyword(s):  
Medical Imaging ◽  
Flexible Substrate ◽  
Amorphous Selenium

3-D conformal graphene for stretchable and bendable transparent conductive film

2015 ◽  
Vol 3 (48) ◽  
pp. 12379-12384 ◽  
Author(s):  
Xuefen Song ◽  
Jun Yang ◽  
Qincui Ran ◽  
Dapeng Wei ◽  
Liang Fang ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Flexible Substrate ◽  
Chemical Vapor ◽  
Transparent Conductive Film ◽  
3D Graphene ◽  
Graphene Films ◽  
Conductive Film

This paper demonstrates the preparation of conformal 3D graphene films on a flexible substrate by chemical vapor deposition (CVD).

Numerical and experimental analysis of the effect of metal tie layers on improving electrical properties of gold coated poly (dimethylsiloxane) flexible multi-layered films during folding

2018 ◽  
Vol 35 (2) ◽  
pp. 135-156 ◽  
Author(s):  
Bor-Jiunn Wen ◽  
Pen-Cheng Wang ◽  
Pin-Hsuan Hung
Keyword(s):  
Electrical Properties ◽  
Stress Analysis ◽  
Flexible Electronics ◽  
Flexible Substrate ◽  
Experimental Result ◽  
Adhesion Layer ◽  
Resistance Increase ◽  
Conductive Film ◽  
Test Platform ◽  
Conductive Substrates

To improve folding electrical properties of flexible electronics, this study presents a new adhesive stress analysis of depositing an adhesion layer between the conductive film electrode and the flexible substrate during folding test by a folding test platform. The folding test platform controls folding curvature of the flexible conductive substrates, folding times, and velocities in this study. Moreover, the electrical properties of flexible conductive substrates are measured during folding testing by the folding test platform. Eventually, this study successfully analyzes residual strain, adhesive stress, and electrical properties of flexible gold coated on polydimethylsiloxane substrates with chromium, nickel, and titanium adhesion layers up to 0.5/cm folding curvature during folding testing. The chromium adhesion layer had the best performance based on the largest adhesive stress, only 3.74 Ω resistance increase and 4.53 Ω maximum resistance up to 0.5/cm folding curvature during folding test by a folding test platform. The experimental result with chromium adhesion layer is consistent with adhesive stress analysis and provides a better adhesive strength between gold and polydimethylsiloxane than nickel and titanium materials for folding test. Therefore, adhesive stress analysis is adapted to evaluate the foldable electronics performance for improving folding characteristics easier.

Preparation and tensile conductivity of carbon nanotube/polyurethane nanofiber conductive films based on the centrifugal spinning method

2021 ◽  
Author(s):  
Luo wei ◽  
Mei Shunqi ◽  
Liu Teng ◽  
Yang Liye ◽  
Fan Lingling
Keyword(s):  
Wrist Joint ◽  
Flexible Substrate ◽  
Research Area ◽  
Conductive Films ◽  
Conductive Film ◽  
Centrifugal Spinning ◽  
The Matrix ◽  
Human Joints ◽  
Human Finger ◽  
Conductive Thin Films

Abstract Flexible conductive thin films have recently become a research area of focus in both academia and industry. In this study, a method of preparing nanofiber conductive films by centrifugal spinning is proposed. Polyurethane (PU) nanofiber films were prepared by centrifugal spinning as the flexible substrate film, and carbon nanotubes (CNTs) were used as the conducting medium, to obtain CNTs/PU nanofiber conductive films with good conductivity and elasticity. The effects of different CNT concentrations on the properties of the nanofiber films were investigated. It was found that the conductivity of the nanofiber conductive films was optimal when an impregnation concentration of 9% CNTs was used in the stretching process. Cyclic tensile resistance tests showed that the nanofiber conductive films have good durability and repeatability. Physical and structural property analysis of the CNT/PU conductive films indicate that the adsorption of the CNTs on the PU surface was successful and the CNTs were evenly dispersed on the surface of the matrix. Moreover, the CNTs improved the thermal stability of the PU membrane. The CNT/PU conductive films were pasted onto a human finger joint, wrist joint, and Adam's apple to test the detection of movement. The results showed that finger bending, wrist bending, and laryngeal prominence movement all caused a change in resistance of the conductive film, with an approximately linear curve. The results indicate that the CNT/PU nanofiber conductive film developed in this study can be used to test the motion of human joints.

Introduction to Medical Imaging

2009 ◽  
Author(s):  
Nadine Barrie Smith ◽  
Andrew Webb
Keyword(s):  
Medical Imaging
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