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Radiation-tolerant memory optimises medical devices

09 Jul 2014  | Gary Hilson

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A good chunk of the Internet of Things is medical wearables for tracking fitness and health, but there are also specialised medical applications that are more focused and complex.

Flash memory, such as NOR flash and SPI flash memory, has found use in portable medical devices that include heart-rate monitors, blood analysers, digital thermometers, and portable defibrillators. A great deal of focus is put on form factor and power consumption of memory—how do you provide enough computing power in a small device and extend battery life?

But in the case of medical devices, there's also the issue of safety, especially with the advent of smarter devices that are worn close to or can be implanted in the human body. Many of these devices include wireless communication, so standards have been developed to ensure the safety of those wearing devices. The IEEE 802.15.6-2012 standard, for example, addresses security, reliability, power, quality of service, data rate, and interference protection so these wireless devices and sensors can be used for medical purposes.

Some medical devices are single use and produced in large volume, but more intelligent, high-value devices are reusable. And more importantly, they may also require sterilisation in order to be used in the human body, and that process poses a danger to memory—it can't withstand the gamma radiation needed to sterilise a device to the degree these environments require.

Radiation has always been a threat to memory technologies, but historically the use cases have applied to vehicles travelling at very high altitudes and satellites and other equipment being launched into space, noted Jim Handy, principal analyst at Objective Analysis. In the early days of digital cameras, not only was there concern that photographic film might not survive more powerful security inspection equipment at airports, but that the data on the flash cards in cameras might be wiped out as well.

A new type of memory developed by Adesto Technologies has been tested and proven to endure the sterilisation required for medical applications. While the company's focus has been on low-power memory, it has also spent a number of years investigating the tolerance of its proprietary memory to radiation.

Adesto CEO Narbeh Derhacobian said there is no memory technology today that can survive sterilisation through radiation, and this has been a barrier to putting more intelligence into medical devices. Its conductive bridging random access memory (CBRAM), which is non-volatile, uses typical memory cells to store digital ones and zeroes. Adesto adds a dielectric layer in its manufacturing process. A small electrical voltage is used to change the resistance of the memory cell between high and low resistance to distinguish between ones and a zeroes.

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