Medical Design Briefs - November 2024 - 17

Connected devices
Digital interfaces
Cloud platform
Insulin
pump
Smart
wearable
Secure cloud
platform
Inhaler
Continuous
Glucose
Monitors (CGM)
Patient app and dashboard
for healthcare professionals
Auto- injectors
and pens
Wearable
injector
Fig. 1 - Connected drug-delivery systems are radically changing how patients receive medications.
1
Power management
eFuse , PPTC
4
Activity detection
Tactile Switch, Detect Switch,
Reed Switch, TMR Switch
Data analytics
(Therapy data), health
analytics, etc.
(Health insurance,
medical records,
etc.)
4
2
USB
TVS Diode Array
1
2
5
3
5
6
7
Under development
Plunger position
measurement
TMR Sensor
3
7
Dose dialing
Detect Switch
Motor control
TVS Diode, Gate Driver
6
Control unit
Microcontroller
Fig. 2 - Wearable medicine injector example and recommended protection and control components.
mits data and receives adjusted settings
from medical personnel through a wireless
communication interface.
Robust Protection
Robust operation requires protection
from electrical hazards. Using special-purpose
components will withstand the hazards
to protect the circuit blocks. If using
a USB-A or -B input protocol, a polymer
positive temperature coefficient (PPTC)
resettable fuse provides overcurrent proMedical
Design Briefs, November 2024
tection of the USB Input circuit. Look
for PPTC fuses with very low resistances
to minimize power loss through the fuse.
Models of PPTC fuses, for most current
ratings, have internal resistances under
1 Ω. PPTC fuses are also available in small,
space-saving surface mount packages.
A more complete USB input circuit
protection alternative for the higher power
USB-C interface is a one-chip solution,
a 4-pin surface-mounted integrated circuit
(IC) that combines overcurrent, overvoltwww.medicaldesignbriefs.com
age,
and overtemperature fault protection.
This component, whose block diagram
is shown in Figure 4, is one model in
the family of Littelfuse products known as
eFuse™ circuit protection ICs. In addition
to protection against overcurrent, overvoltage,
and overtemperature fault conditions,
an eFuse has soft-start circuitry to
minimize inrush current and under voltage
lockout to prevent operation until the
supply voltage has reached an adequate
level. To minimize power loss, the eFuse
17

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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
Medical Design Briefs - November 2024 - 21
Medical Design Briefs - November 2024 - 22
Medical Design Briefs - November 2024 - 23
Medical Design Briefs - November 2024 - 24
Medical Design Briefs - November 2024 - 25
Medical Design Briefs - November 2024 - 26
Medical Design Briefs - November 2024 - 27
Medical Design Briefs - November 2024 - 28
Medical Design Briefs - November 2024 - 29
Medical Design Briefs - November 2024 - 30
Medical Design Briefs - November 2024 - 31
Medical Design Briefs - November 2024 - 32
Medical Design Briefs - November 2024 - 33
Medical Design Briefs - November 2024 - 34
Medical Design Briefs - November 2024 - 35
Medical Design Briefs - November 2024 - 36
Medical Design Briefs - November 2024 - 37
Medical Design Briefs - November 2024 - 38
Medical Design Briefs - November 2024 - 39
Medical Design Briefs - November 2024 - 40
Medical Design Briefs - November 2024 - 41
Medical Design Briefs - November 2024 - 42
Medical Design Briefs - November 2024 - 43
Medical Design Briefs - November 2024 - 44
Medical Design Briefs - November 2024 - 45
Medical Design Briefs - November 2024 - 46
Medical Design Briefs - November 2024 - 47
Medical Design Briefs - November 2024 - 48
Medical Design Briefs - November 2024 - 49
Medical Design Briefs - November 2024 - 50
Medical Design Briefs - November 2024 - COV3
Medical Design Briefs - November 2024 - COV4
https://www.nxtbook.com/smg/techbriefs/25MDB02
https://www.nxtbook.com/smg/techbriefs/25MDB01
https://www.nxtbook.com/smg/techbriefs/24MDB12
https://www.nxtbook.com/smg/techbriefs/24MDB11
https://www.nxtbook.com/smg/techbriefs/24MDB10
https://www.nxtbook.com/smg/techbriefs/24MDB09
https://www.nxtbook.com/smg/techbriefs/24MDB08
https://www.nxtbook.com/smg/techbriefs/24MDB07
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https://www.nxtbook.com/smg/techbriefs/23MDB12
https://www.nxtbook.com/smg/techbriefs/23MDB11
https://www.nxtbook.com/smg/techbriefs/23MDB10
https://www.nxtbook.com/smg/techbriefs/23MDB09
https://www.nxtbook.com/smg/techbriefs/23MDB08
https://www.nxtbook.com/smg/techbriefs/23MDB07
https://www.nxtbook.com/smg/techbriefs/23MDB06
https://www.nxtbook.com/smg/techbriefs/23MDB05
https://www.nxtbook.com/smg/techbriefs/23MDB04
https://www.nxtbook.com/smg/techbriefs/23MDB03
https://www.nxtbook.com/smg/techbriefs/23MDB02
https://www.nxtbook.com/smg/techbriefs/23MDB01
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
https://www.nxtbook.com/smg/techbriefs/22MDB08
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
https://www.nxtbook.com/smg/techbriefs/21MDB06
https://www.nxtbook.com/smg/techbriefs/21MDB05
https://www.nxtbook.com/smg/techbriefs/21MDB04
https://www.nxtbook.com/smg/techbriefs/21MDB02
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