Medizintechnik Medical Devices
AEROSPACEMedical DevicesMicro-GridAutomotiveMarine TechnologyMobile MachinesTelecommunications

POWERING MEDICAL DEVICES

IEC 60601 is a series of technical standards for the safety and effectiveness of medical electrical equipment. In the powering of medical devices, key components for such systems are batteries, power supplies, cables, or connectors. Furthermore, if one goes a level deeper power management includes —microchips and other power electronics.

Increasing Power Density: Power-hungry medical devices such as imaging equipment and operating power tool, power management is critical. While power supplies for x-ray machines tend to range from 2 to 3 kW, high-end systems such as CT scanners can exceed 100 kW. In these power ranges portability is less attractive. In such applications, one of the most important objectives for system designers is to increase power density. To accomplish this goal, the industry requires high energy power packs that are both durable, reliable, and safe under all conditions and if required compliant to IEC 60601-1 3rd edition.

Enhancing Power Efficiency: A primary consideration when developing electronic medical devices is how to control leakage currents that may be present from electrical terminals that connect the patient to a system ground. If an external fault occurs in such cases, the patient might get an electric shock or even electrocuted. To avoid this issue, systems generally feature a redundant layer of insulation in the power-delivery path. An isolation barrier is necessary in all medical device applications. Most medical devices perform imaging functions or sense small signals, the primary considerations after passing the isolation barrier is to minimize noise levels in order to avoid affecting imaging or sensor signals.

Optimization: Introducing an ultra-low-power micro-controller into the design to maximize battery life—that’s the key to managing power in such portable medical devices of all types. For such systems, the main requirements are to have low-power components, having a powerful CPU core to control, and being able to perform advanced calculations, having ample non-volatile memory to store both program images. Achieving ultra-low power has been characterized by two main themes:

  • Retaining the lowest power mode before waking to run my application—known as static energy.
  • Speed to process the required application before returning to my lowest power mode—known as active power.

Alternatively, an application can scale to the most power-efficient frequency and then return to the lowest power state. A critical consideration is the overall device architecture in proper the usage of:

  • sensors connected using an inter-integrated circuit (I2C),
  • serial peripheral interface (SPI),
  • universal asynchronous receiver/transmitter (UART)
  • CPU clock

Critical to preserving battery life is the ability to keep operational energy usage to a minimum. During operation, management of operating power is critical. Two main issues affect power consumption: reducing leakage current in the static-power state and ensuring a low runtime current for achieving dynamic operation.

SYSTEMS ENGINEERING

ACTARON offers a collaborative approach, delivering high value, high quality solutions.

Key ACTARON Technologies:

(1) Medical Energy Storage Solutions
(2) Power electronics
(3) Software and Hardware Development

  • Compliance Management
  • V-model based systems engineering
  • Strategic and Management Consulting
  • System Specifications
  • Requirements Management
  • Safety Management: H&R, FMEA
  • Architecture Definition HW & SW
  • System Modelling
  • Safety Critical Control Systems
  • Power-train development and design
  • Components and systems development
  • Components and integration
  • Systems testing and validation
  • Homologation / certification support