Medical Design Briefs - December 2021 - 28

Application
Product Types
Materials
Method
Build Speed
Accuracy
Detail Capability
Surface Quality
Optics & Photonics
Technology
Optical System
Complexity
Instrumentation
3D Printing in Medical Applications
Implants
Surgical Tools
Metals
Laser Powder
Bed Fusion
Cranial Plates
Hip Joints
Dental Implants
Metals
Laser Powder
Bed Fusion
5-20 cm3 per hour
±20-50 μm
40-200 μm
Ra ~ 4-10 μm
High Power
Lasers/Complex
Coatings/Precise
Beam Control/
In-situ Monitoring
High
High Power
Lasers/Complex
Coatings/Precise
Beam Control/
In-situ Monitoring
High
Metals
Electron Beam
Plastics/Resins
Digital Light
Control/Projection
Orthopedic
Orthodontic
External Prostheses
Hands, Feet,
Limbs
Preclinical
Anatomical
Model
Metals/Polymers Myocardium A
Laser Powder Bed
Fusion
Up to 80 cm3 per hour 100 mm per hour 5-20 cm3 per hour
140 μm
Down to 30 μm
-
-
No Optics
-
-
Low Power
Laser/LED
Illumination
-
Medium/High
35 μm
-
-
High Power Lasers/
Complex Coatings/
Precise Beam
Control/In-situ
Monitoring
High
Polyjet
Photocuring
20 mm
Down to 14 μm
-
6-15 μm
Low-Power UV
Light
Source/Beam
Delivery Optics
Medium
Tissues/Biomaterials
Cardiac, Bone,
Biomaterials
Cells, Hydrogels, Bioinks,
Thermoplastics
Fused Deposition
Modeling (FDM), Injection
Pore Filing (IPF)
25 mm per hour
Few microns
-
10-30 μm (in FDM)
UV LEDs for Photocuring
Low
Table 1. Types of 3D printers, methods, and materials used in the production of metal, plastic, and polymer parts for use in various medical applications.
approaches that account for emissivity
changes in the material during processing.
Targeted spectroscopy on these optical
radiation signals can also identify specific
spectral signatures that can be correlated
to part defects.1
Additional optical sensors - like laser
power meters - monitor the delivered
power, and high-speed cameras can
observe the size and shape of the melt
pool. Signatures from these signals can
create a detailed picture of the additive
build process and provide deep understanding
of printed part quality, machine
health, and batch-to-batch variability across
different machines installed at different
locations. Beyond process monitoring,
high-resolution cameras positioned above
the process plane can report dimensional
accuracy of the print layer by layer and flag
geometry errors or material deficiencies
which can ruin a print. Lastly, beam profilers
and cameras can be invaluable during
setup and maintenance of the machine.
Reference
1. Dunbar, A. and Nassar, A., " Assessment of
optical emission analysis for in-process
monitoring of powder bed fusion additive
manufacturing, " Virtual and Physical
Prototyping, 2017, pp. 14-19, https://
www.tandfonline.com/doi/abs/10.1080/1
7452759.2017.1392683.
This article was written by Jason Karp,
Principal Optical Engineer, and Dan Gray,
PhD, Founder of Gray Optics. For more in -
formation, visit http://info.hotims.com/
79420-344.
Shifting Demand for Multi-Layer Ceramic Capacitors
Creates a Critical Supply Shortfall for Medical
Electronics Needs
MLCC manufacturers are
ramping up manufacturing
capacity.
Johanson Technology
Camarillo, CA
Medical equipment product manufacturers'
demand for high-quality,
high-voltage multi-layer ceramic capacitors
(MLCCs) has been hit hard by a
shift in production by the world's
largest MLCC manufacturers who are
focusing on a seemingly insatiable
demand for smaller, lower voltage -
28
Cov
and in some way - lower performance
MLCCs. This demand has been fueled
by the global growth of 5G networks
and continued advancements in smart
phones and mobile devices who are
consuming significantly more MLCCs
per device.
As the principal manufacturers pivot
away from the larger high-voltage, high
Q (high quality) MLCCs used, medical
device OEMs are experiencing significant
delays in MLCCs of up to six
months. The extent of the supply shortage
jeopardizes product release schedules
and market share.
www.medicaldesignbriefs.com
ToC
" It is a pretty massive carrot that is
hanging in front of the major MLCC
manufacturers, " says Scott Horton, vice
president at Johanson Technology, a 40year
provider of high-voltage ceramic
multi-layer capacitors based in Camarillo,
CA. " When you consider that a high-end
smart phone today can require substantially
more MLCCs in a single device as
compared to a similar phone only a few
years ago, the current demand for smaller,
lower power MLCCs is like nothing
the market has seen before. "
As a result of a slowdown in consumer
demand for capacitors in 2019,
Medical Design Briefs, December 2021
https://www.tandfonline.com/doi/abs/10.1080/17452759.2017.1392683 http://info.hotims.com/79420-344 http://www.medicaldesignbriefs.com
Medical Design Briefs - December 2021

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