Medical Design Briefs - March 2024 - 30

Design Briefs
damaged tooth virtually unnoticed,
actually like a magician with a magic
wand, " states Tom Cheng, who is responsible
for product development and
production at Milestone Scientific.
Very Good Flow Characteristics
During Injection Molding
The processing properties of CYROLITE®
GS-90 support the continuous development
of the product design of the
The Wand - STA System's handpieces.
With a high heat deflection temperature
and excellent melt flow rate, the molding
compound is ideal for precise injection
molding and extrusion of thin-walled and
complex molded parts with high stability.
This CYROLITE® grade is especially
impact resistant. Furthermore, it is compatible
for direct contact with body fluids,
many chemicals, and drugs - in this
case anesthetics. Components made of
CYROLITE® molding compounds can
be solvent and thermal bonded as well as
ultrasonic or spin-welded to PVC hoses
and other plastic components.
Undiminished Transparency after
Gamma Sterilization
The handpieces used for The Wand
are designed for single use and are delivered
in sterile packaging. This is why
the outstanding material resistance of
CYROLITE® GS-90 exhibited during
sterilization with gamma rays (although
it is also suited for EtO gas and E-beam
sterilization) was a crucial factor in Milestone
Scientific's decision to select this
medical plastic from Röhm.
" During our material testing, CYROLITE®
GS-90 was still absolutely transparent,
without any cloudiness, discoloration
or embrittlement, after a three-year
stability test, " Cheng confirms. He also
explains why it is so important that the
components are transparent: " The transMolding
Compounds with
Consistent Quality
" We greatly appreciate that Röhm
has been supplying CYROLITE® molding
compound reliably for such a long
time and in a consistently high quality.
We have produced nearly 15 million The
Wand STA devices over the past 25 years,
which we have sold in 45 countries. The
molding compound for the handpieces
was always immaculate and we have no
problems ever since, " Cheng adds.
This article was written by Michael Zadrozny,
Strategic Account Manager, Medical,
at Röhm, Parsippany, NJ. For more
information, visit www.roehm.com.
Part 1: Designing Piezo Handpieces for Ultrasonic
Surgery
To prevent overheating during operation of the handpiece, low-loss
piezoelectric materials with a high mechanical grade are used.
By Dr.-Ing. Timo Scholehwar, PI Ceramic
U
ltrasonic
handpieces
are
being
used with growing frequency in
medical applications, for example,
with minimally invasive surgical
procedures and in dentistry. These instruments,
which
include
ultrasonic
scalpels, phaco handpieces, and scalers,
use acoustic waves to facilitate the processing
of hard or soft tissue. Part 1 of
this article looks at the general structure,
design variants, and system design of ultrasonic
medical handpieces. In a future
issue, Part 2 will examine driver design,
special applications, drive electronics,
and failure mechanisms.
Targeted Heat Generation
Hard tissue, such as bones or teeth,
can be machined with drills or burs, for
example, during oral surgery. In this
case, ultrasound is used to facilitate the
mechanical processing by means of additional
shocks or cavitation. Depending
on the selected working frequen30
parent
cartridge allows the dentist to see
whether the anesthetic is being delivered.
And the transparent tube of the
applicator allows them to visually check
that the needle has not hit a blood vessel
during the injection. "
Ultrasonic handpieces, which include ultrasonic scalpels, phaco handpieces and scalers, use acoustic waves to facilitate
the processing of hard or soft tissue. (Credit: Physik Instrumente)
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Medical Design Briefs, March 2024

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Medical Design Briefs - March 2024

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