Medical Design Briefs - November 2024 - 20
Medicine Injectors
High-efficiency 8-bit MCUs are available
for control of injector operation.
Available MCUs can have operating
current as low as 2 mA. Lower clock
speed settings can reduce the operating
current even further. These MCUs
have low-power inactivity modes that
reduce current consumption to 0.7 µA.
Models can have 15 analog-digital converter
channels with 12-bit resolution,
16 Kbyte flash memory, and an on-chip
temperature sensor array. These MCUs
have high resolution timers for PWM
drive of motors.
They also have peripheral I/O ports
optimized for interfacing with wireless
communication chipsets. For efficient
control of the motor, use a gate driver
to interface between the MCU and the
power MOSFET or IGBT motor drives.
Gate drivers have TTL and CMOS inputs
to allow direct connection to a MCU output
control line. Schmitt triggered logic
inputs minimizes motor torque ripple,
and 50 ns propagation delay between
high and low side outputs enables precise
control of the motor.
Standards for Wearable Medicine
Injectors
Medical devices are highly regulated
for the purpose of patient safety. Table 1
lists the global standards design engineers
must adhere to for development of a compliant
device. Understanding these standards
and their impact on device design
is essential for obtaining medicine device
approval from the regulating bodies.
Expertise in Robust and Efficient
Design
Ensuring reliable performance is essential
for wearable medicine injectors,
which must operate 24 hours a day, seven
days a week. Protecting an injector from
hazards such as overcurrent, overvoltage,
overtemperature, and ESD is critical for
ensuring reliable, robust operation. Adding
components that provide circuit protection
counters the requirements for
small device size, low power consumption,
and low weight. Surface-mounted,
low-power consumption components introduced
in this article can minimize the
impact of achieving circuit protection
while not significantly impacting size,
power, and weight targets.
Designers can save development time
and compliance costs by taking advantage
of component manufacturers' expertise.
Their application engineers can
help with the selection of cost-effective
and efficient protection and control components.
In addition, they can help guide
design requirements dictated by the applicable
standards. Some manufacturers,
such as Littelfuse, can perform precompliance
testing to avoid compliance test
failures, saving testing costs and avoiding
delays due to multiple compliance
test cycles. Expert assistance combined
with the recommended components will
result in a low-power and robust, small,
lightweight wearable medicine injector.
This article was written by Dr. Marco
Doms, Sr. Manager Business Development
New Platforms, Littelfuse, Inc., Chicago,
IL. He is responsible for several platforms
with new products or product features that
require additional internal and customer
coordination. For more information, visit
www.littelfuse.com.
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Medical Design Briefs, November 2024
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Medical Design Briefs - November 2024
Table of Contents for the Digital Edition of Medical Design Briefs - November 2024
Medical Design Briefs - November 2024 - Intro
Medical Design Briefs - November 2024 - Sponsor
Medical Design Briefs - November 2024 - COV1a
Medical Design Briefs - November 2024 - COV1b
Medical Design Briefs - November 2024 - COV1
Medical Design Briefs - November 2024 - COV2
Medical Design Briefs - November 2024 - 1
Medical Design Briefs - November 2024 - 2
Medical Design Briefs - November 2024 - 3
Medical Design Briefs - November 2024 - 4
Medical Design Briefs - November 2024 - 5
Medical Design Briefs - November 2024 - 6
Medical Design Briefs - November 2024 - 7
Medical Design Briefs - November 2024 - 8
Medical Design Briefs - November 2024 - 9
Medical Design Briefs - November 2024 - 10
Medical Design Briefs - November 2024 - 11
Medical Design Briefs - November 2024 - 12
Medical Design Briefs - November 2024 - 13
Medical Design Briefs - November 2024 - 14
Medical Design Briefs - November 2024 - 15
Medical Design Briefs - November 2024 - 16
Medical Design Briefs - November 2024 - 17
Medical Design Briefs - November 2024 - 18
Medical Design Briefs - November 2024 - 19
Medical Design Briefs - November 2024 - 20
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Medical Design Briefs - November 2024 - 30
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Medical Design Briefs - November 2024 - 40
Medical Design Briefs - November 2024 - 41
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Medical Design Briefs - November 2024 - 47
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Medical Design Briefs - November 2024 - 49
Medical Design Briefs - November 2024 - 50
Medical Design Briefs - November 2024 - COV3
Medical Design Briefs - November 2024 - COV4
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