Effect of platinum metallization in cofired platinum / alumina microsystems for implantable medical applications

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000177-000182
Author(s):  
Ali Karbasi ◽  
Ali Hadjikhani ◽  
W. Kinzy Jones
Keyword(s):  
Implantable Devices ◽  
Alumina Ceramic ◽  
Ceramic Technology ◽  
Medical Applications ◽  
Densification Rate ◽  
Material Combination ◽  
Final Assembly ◽  
Ceramic Insulator ◽  
Multilayer Ceramic ◽  
Neural Stimulator

Typically, hermetic feedthroughs for implantable devices, such as pacemakers, use an alumina ceramic insulator brazed to a platinum wire pin. This material combination has a long history in implantable devices and is the desired structure due to the acceptance by the FDA for implantable hermetic feedthroughs. The growing demand for increased input/output (I/O) hermetic feedthroughs for implantable neural stimulator applications can be addresses by developing a new, co-fired platinum/alumina multilayer ceramic technology in a configuration that supports 300 plus I/Os, which is not commercially available. Different densification rate of platinum and alumina is the major issue in developing a high-density feedthrough. This difference in densification rate could create delamination and crack in feedthrough structure and decrease the reliability and degree of the hermeticty of the final assembly. In this paper different metallization were evaluated to minimize this difference. Additionaly the firing atmosphere and the firing profiles were evaluated to minimize this difference. FIB nano-machining and SEM with EDS were used for the analysis of these conditions.

A new concept for versatile photomultipliers: multilayer ceramic technology

1997 ◽  
Vol 387 (1-2) ◽  
pp. 79-82
Author(s):  
G. Comby ◽  
M. Karolak ◽  
Y. Piret ◽  
J.-P. Mouly
Keyword(s):  
Ceramic Technology ◽  
Multilayer Ceramic

scholarly journals Construction of microgrooves on the surface of alumina ceramic insulator to enhance its flashover strength

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045009 ◽  
Author(s):  
Wenyuan Liu ◽  
Yuewen Guo ◽  
Yankun Huo ◽  
Changfeng Ke ◽  
Jun Cheng ◽  
...  
Keyword(s):  
Alumina Ceramic ◽  
Ceramic Insulator

Ceramic Microjet Cooling Device

2006 ◽  
Author(s):  
Govindarajan Natarajan ◽  
R. J. Bezama
Keyword(s):  
Pressure Drop ◽  
Thermal Management ◽  
Water Pressure ◽  
Ceramic Technology ◽  
Microchannel Flow ◽  
Convection Coefficient ◽  
Cooling Device ◽  
Multilayer Ceramic ◽  
Design And Manufacture ◽  
Very High

This paper details the technology elements developed to design and manufacture a liquid microjet array cooling device, for thermal management of very high power dissipating electronic chips. Multilayer ceramic technology (MLC) is used to build the cooling device with microns size jet arrays, which include distributed return network for the spent fluid. Intertwined microchannel flow networks inside the cooler body distribute the flow in and out of the device. A cooler with 1600 jets and 1681 interstitial returns for the drains built using Glass Ceramic material is discussed. The device when tested with an 18 mm heated silicon chip and an average convection coefficient of 0.052 MW/m2K demonstrated a cooling capability greater than 2.5 MW/m2, with a water pressure drop of < 70 kPa. Further extension of the cooling capability to greater than 6 MW/m2, as predicted by the simulation is also discussed.

Non-blocking Ka-band switch matrix module in three-dimensional multilayer ceramic technology

2017 ◽  
Author(s):  
Alexander Ebert ◽  
Alexander Schulz ◽  
Jens Muller ◽  
Ralf Stephan ◽  
Tobias Kasser ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Ceramic Technology ◽  
Ka Band ◽  
Multilayer Ceramic

Molecule self-assembly on alumina ceramic insulator to enhance its vacuum surface voltage withstand strength

2020 ◽  
Vol 127 (24) ◽  
pp. 243304
Author(s):  
Yankun Huo ◽  
Wenyuan Liu ◽  
Yuewen Guo ◽  
Changfeng Ke ◽  
Jun Cheng ◽  
...  
Keyword(s):  
Self Assembly ◽  
Alumina Ceramic ◽  
Ceramic Insulator

Residual Stresses and Damage in Multilayer Ceramic/Metal Packages

1986 ◽  
Vol 72 ◽  
Author(s):  
A. G. Evans ◽  
C. H. Hsueh
Keyword(s):  
Residual Stresses ◽  
Mechanical Damage ◽  
Thermal Contraction ◽  
Densification Rate ◽  
Porous Metals ◽  
Material Parameters ◽  
Dense Ceramic ◽  
Induced Stresses ◽  
Multilayer Ceramic ◽  
Flow Laws

AbstractMultilayer ceramic/metal modules are subject to stresses that develop both upon co-sintering and upon cooling. The sources and magnitudes of these stresses are described and discussed. The co-sintering induced stresses derive from densification-rate mismatch and can be analyzed in terms of constitutive laws that describe the densification and creep of partially dense ceramic and metal bodies. Cooling induced stresses are associated with thermal contraction mismatch and are strongly influenced by the plastic flow laws for porous metals. Typical stresses produced during co-sintering and cooling are calculated and techniques for minimizing such stresses are discussed and analyzed. Mechanical damage, manifest as brittle cracks and creep cracks, are also described and analyzed. Critical values of material parameters that exclude extensive crack damage are then emphasized, based on models of crack propagation.

Development of the Electromagnetic Induction Type Micro Air Turbine Generator Using MEMS and Multilayer Ceramic Technology

2011 ◽  
Vol 18 (9) ◽  
pp. 092035 ◽  
Author(s):  
A Iiduka ◽  
K Ishigaki ◽  
Y Takikawa ◽  
T Ohse ◽  
K Saito ◽  
...  
Keyword(s):  
Electromagnetic Induction ◽  
Ceramic Technology ◽  
Turbine Generator ◽  
Air Turbine ◽  
Induction Type ◽  
Multilayer Ceramic

scholarly journals Autocharging Techniques for Implantable Medical Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Hamza Abu Owida ◽  
Jamal I. Al-Nabulsi ◽  
Nidal M. Turab ◽  
Feras Alnaimat ◽  
Hana Rababah ◽  
...  
Keyword(s):  
Medical Devices ◽  
Human Body ◽  
Disease Diagnosis ◽  
Implantable Devices ◽  
Biofuel Cells ◽  
Medical Applications ◽  
Medical Field ◽  
Power Sources ◽  
Power Harvesting ◽  
Triboelectric Nanogenerators

Implantable devices have successfully proven their reliability and efficiency in the medical field due to their immense support in a variety of aspects concerning the monitoring of patients and treatment in many ways. Moreover, they assist the medical field in disease diagnosis and prevention. However, the devices’ power sources rely on batteries, and with this reliance, comes certain complications. For example, their depletion may lead to surgical interference or leakage into the human body. Implicit studies have found ways to reduce the battery size or in some cases to eliminate its use entirely; these studies suggest the use of biocompatible harvesters that can support the device consumption by generating power. Harvesting mechanisms can be executed using a variety of biocompatible materials, namely, piezoelectric and triboelectric nanogenerators, biofuel cells, and environmental sources. As with all methods for implementing biocompatible harvesters, some of them are low in terms of power consumption and some are dependent on the device and the place of implantation. In this review, we discuss the application of harvesters into implantable devices and evaluate the different materials and methods and examine how new and improved circuits will help in assisting the generators to sustain the function of medical devices.

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