Medical Design Briefs - March 2024 - 33

Tissue Treatment
Hard-tissue processing
Cutting soft tissue
Sealing soft tissue
Phacoemulsification
Tartar removal
Table 1. Typical ultrasonic frequencies for tissue processing.
Vibration Mode
Longitudinal
Transversal
Torsional
essary to enable the operator to work
without interruption.
In modular scalers, the amplitude at the
tool is first approximated on the basis of
the resonant amplitude of the driver and
the multiplying factors of the booster and
sonotrode (see Figure 4). However, this is
a vast oversimplification, and, for medical
Frequency [kHz]
25
60
30
25
35
Treatment
Soft-tissue biopsy
Cutting, coagulation
Hard-tissue biopsy
Table 2. Ultrasonic vibration modes for different tissue treatments.
applications, should always be verified by
means of FEM simulation. Depending on
the application, adjusting the vibration
mode at the tool tip can lead to significant
benefits during treatment. For example,
by using a torsional vibration, a bone biopsy
can be performed faster and with less
damage to the surrounding tissue.
Modification of the vibration mode
(see Table 2) is accomplished in the simplest
case via modification of the tool tip
(e.g., the bend angle) and in the most
complex case by adapting the design of
the transducer, booster and sonotrode.
Critical design factors are the areas of
maximum strain, temperature control,
and precise positioning of the vibration
nodes in the scaler.
Ultrasonic handpieces are being used
in many applications, from minimally
invasive surgical procedures to dentistry.
This article reviewed the general structure
and system design of ultrasonic
handpieces. Part 2 will examine driver
design, special applications, drive electronics,
and failure mechanisms.
This article was written by Dr.-Ing.
Timo Scholehwar, Sr. Design Engineer
R&D Piezo Components & Materials,
PI Ceramic GmbH, Lederhose, Germany.
For more information, contact
Stefan Vorndran, VP Marketing for
Physik Instrumente L.P., Auburn, MA, at
stefanv@ pi-usa.us; www.pi-usa.us or visit
www.piceramic.com/en.
FOR WHATEVER YOU'RE MAKING,
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OUR PART.
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For over 100 years, nearly every industry across the
globe has trusted Boker's to provide quality components,
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Medical Design Briefs, March 2024
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Medical Design Briefs - March 2024

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Medical Design Briefs - March 2024 - CVRFLAP1
Medical Design Briefs - March 2024 - CVRFLAP2
Medical Design Briefs - March 2024 - Cover1
Medical Design Briefs - March 2024 - Cover2
Medical Design Briefs - March 2024 - 1
Medical Design Briefs - March 2024 - 2
Medical Design Briefs - March 2024 - 3
Medical Design Briefs - March 2024 - 4
Medical Design Briefs - March 2024 - 5
Medical Design Briefs - March 2024 - 6
Medical Design Briefs - March 2024 - 7
Medical Design Briefs - March 2024 - 8
Medical Design Briefs - March 2024 - 9
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Medical Design Briefs - March 2024 - Cover3
Medical Design Briefs - March 2024 - Cover4
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https://www.nxtbook.com/smg/techbriefs/24MDB12
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https://www.nxtbook.com/smg/techbriefs/techleaders22
https://www.nxtbook.com/smg/techbriefs/22MDB12
https://www.nxtbook.com/smg/techbriefs/22MDB11
https://www.nxtbook.com/smg/techbriefs/22MDB10
https://www.nxtbook.com/smg/techbriefs/22MDB09
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https://www.nxtbook.com/smg/techbriefs/22MDB07
https://www.nxtbook.com/smg/techbriefs/22MDB06
https://www.nxtbook.com/smg/techbriefs/22MDB04
https://www.nxtbook.com/smg/techbriefs/techleaders21
https://www.nxtbook.com/smg/techbriefs/22MDB03
https://www.nxtbook.com/smg/techbriefs/22MDB02
https://www.nxtbook.com/smg/techbriefs/22MDB01
https://www.nxtbook.com/smg/techbriefs/21MDB12
https://www.nxtbook.com/smg/techbriefs/21MDB11
https://www.nxtbook.com/smg/techbriefs/21MDB10
https://www.nxtbook.com/smg/techbriefs/21MDB09
https://www.nxtbook.com/smg/techbriefs/21MDB08
https://www.nxtbook.com/smg/techbriefs/21MDB07
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https://www.nxtbook.com/smg/techbriefs/21MDB05
https://www.nxtbook.com/smg/techbriefs/21MDB04
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