Medical Meters: Portable

Portable Medical Instruments such as blood glucose meter, digital blood pressure meter, blood gas meter, digital pulse/heart rate monitor or even a digital thermometer leverage five system level blocks that are common to each.

Block Diagram

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AC/DC Adaptor

Design Considerations

Portable Medical Instrument Design

Portable Medical Instruments device design: blood glucose meter design, blood gas meter, digital pulse/heart rate monitor and digital thermometer design.

What's New

Go passive. Go battery free! With the Passive Low Frequency Interface Device (PaLFI) TMS37157, power your microcontroller, sensor, and sensor interface at short range by the PaLFI interface without a battery.

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Whether developing a glucose meter, blood pressure meter, blood gas meter, digital thermometer, or a heart rate monitor there are system level blocks that are common to each: Power/Battery Management, Control and Data processing, Amplification and A/D Conversion, a display, and the sensor element itself. These are microcontroller controlled handheld devices that operate on battery and take measurements using various bio-sensors, with the topology of these blocks differing with the sensing, processing and information display demands of the meter type and feature set.

Power consumption is key, driven by the need for extended battery life, and high precision with a fast response time. Requirements such as wireless or wired connectivity, historical data profiling and audio or voice feedback drives the need for microcontrollers with adequate memory. Texas Instruments' portfolio of Microcontrollers, Instrumentation and Buffer Amplifiers, Wireless and Wired interface devices, Power and Battery Management, and Audio Amplifiers provides the ideal tool box for portable medical applications.

The common core subsystems are:

  • Analog Front-End/Sensor Interface - Bio-sensor signals in portable meters are slow moving and very low in amplitude. Front-end amplification may be required prior to A/D conversion. Front-end excitation, if required, can be accomplished with a discrete or integrated DAC within the microcontroller.
  • Microcontroller - The Microcontroller executes the signal measuring processes and controls interface with memory and peripheral devices. As power consumption is critical, the broad product portfolio of the Ultra low power MSP430 family makes it an ideal processor choice. Their high level of integration simplifies the design and reduces system cost as buffer amplifiers, data conversion, LCD controllers, and user/keypad interface are provided.
  • Connectivity - Power consumption, data rate and range are the three key considerations when selecting a wireless interface. The Zigbee protocol provides worldwide coverage, a moderate data rate and duty cycle, and supports a mesh network allowing multiple sensors in the same system with a wide range. Bluetooth and Bluetooth Low Energy® protocols provide for limited range but higher data rate.
    Passive Low Frequency Interface products (PaLFI) are not only capable of providing near field wireless connectivity, but depending on your system power consumption, PaLFI is capable of powering your complete system.
  • Power Management and Conversion - Making power management decisions early in the design cycle will help define system-level tradeoffs necessary to meet run-time targets. Smaller portable medical products may use disposable batteries, whereas larger portable systems might leverage rechargeable battery chemistries. Features such as dynamic power path management (DPPM) permit the system to draw power independently of the battery charging path. This allows a device with completely discharged batteries to be used as soon as it is plugged in, rather than waiting for the batteries to recharge. Also look for features such as Impedance tracking or battery authentication when safety and system reliability is critical.
  • Audio Amplifier - The Audio Amplifier amplifies the audio signal coming either from a PWM circuit or a DAC which can be used to notify users when measuring results are available for example. The DAC is capable to output voice instructions from speech-synthesizer software.

Application Notes (3)

Title Abstract Type Size (KB) Date Views
HTM 9 KB 09 Feb 2012 1802
HTM 9 KB 11 Mar 2011 1736
HTM 8 KB 19 Nov 2008 607
    

Reference Designs

Description Part Number Company Tool Type
CC1101EM 315 and 433MHz Reference Design CC1101EM433_REFDES Texas Instruments Reference Designs
CC1101EM 868 and 915MHz Reference Design CC1101EM868-915_REFDES Texas Instruments Reference Designs
CC1110EM 315MHz Reference Design CC1110EM315_REFDES Texas Instruments Reference Designs
CC1110EM 433MHz Reference Design CC1110EM433_REFDES Texas Instruments Reference Designs

Selection and Solution Guides

Selection Guides (2)

Title Abstract Type Size (KB) Date Views
PDF 2.76 MB 06 Oct 2014 22433
PDF 9.09 MB 02 May 2013 3032

Tools and Software

Name Part # Company Software/Tool Type
Code Composer Studio (CCS) Integrated Development Environment (IDE) CCSTUDIO Texas Instruments SW Development Tools, IDEs, Compilers
MSP430 100-Pin Target board and USB Programmer MSP-FET430U100 Texas Instruments Evaluation Modules & Boards
MSP430 80-Pin Target board and USB Programmer MSP-FET430U80 Texas Instruments Evaluation Modules & Boards
MSP430F5xx 100-Pin Target board and USB Programmer MSP-FET430U5X100 Texas Instruments Evaluation Modules & Boards
MSP430FG4618/F2013 Experimenter Board MSP-EXP430FG4618 Texas Instruments Evaluation Modules & Boards

Product Bulletin & White Papers

Product Bulletin (2)

Title Abstract Type Size (MB) Date Views
PDF 140 KB 19 Jun 2013 622
PDF 208 KB 25 Apr 2011 611

White Papers (6)

Title Abstract Type Size (MB) Date Views
PDF 905 KB 31 Jul 2014 4454
PDF 658 KB 09 Jul 2014 3589
PDF 393 KB 27 Jun 2014 12523
PDF 173 KB 04 Jun 2013 978
PDF 1014 KB 17 May 2011 739
HTM 8 KB 25 Oct 2006 23

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