Medical Design Briefs - July 2023 - 6

Catheters:
How to Achieve
Optimal Hypotube Design
I
6
n minimally invasive surgery, the best patient outcome begins
with navigating the vasculature safely and smoothly. For catheters
utilizing a metal shaft construction, good design begins
with a high-performing hypotube. This article provides insights
and guidance on hypotube development and manufacturing
for successful product design. It also presents the key
manufacturing processes required to create the ideal access or
delivery catheter.
The Role of the Hypotube
A hypotube provides essential performance
characteristics to enable access
and delivery within the vasculature
including flexibility, push, torque,
track, kink resistance, lubricity, and fast
inflation and deflation times. However,
these characteristics can present tradeoffs;
for example, a hypotube optimized
for maximum flexibility can exhibit
low push forces. When designing
a hypotube, it is essential to understand
these performance characterisIn
minimally invasive surgery, the best patient outcome begins
with navigating the vasculature safely and smoothly. (Credit:
Freudenberg Medical)
www.medicaldesignbriefs.com
tics and how optimization of one characteristic can impact others
to achieve the perfect balance for the product.
This section explains the key performance characteristics of
the hypotube and how these characteristics translate to the physician
experience when deploying a catheter within the patient.
Torque. The anatomical pathways of the vasculature can be
challenging to navigate, often tortuous or highly calcified. It is
essential that the physician can rotate the minimally invasive device
within the vasculature to reach
the target treatment site and torque, a
twisting force, aids device rotation.
The ability of a device to accurately
transmit this torque along its length is
measured as torque-ability. When
torque forces are not accurately transmitted,
it can lead to a buildup of
force and an undesirable whipping effect
along the device shaft. Innovative
processing techniques can ensure that
hypotube shafts will deliver the necessary
amount of torque, with predictability
of movement when rotating.
Medical Design Briefs, July 2023
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Medical Design Briefs - July 2023

Table of Contents for the Digital Edition of Medical Design Briefs - July 2023

Medical Design Briefs - July 2023 - Cov1A
Medical Design Briefs - July 2023 - Cov1B
Medical Design Briefs - July 2023 - Cov1
Medical Design Briefs - July 2023 - Cov2
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Medical Design Briefs - July 2023 - Cov3
Medical Design Briefs - July 2023 - Cov4
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