Options for Powering Implanted Medical Devices

​Implanted medical devices (IMDs), like pacemakers or neurostimulators, have different requirements for storing and replenishing energy than other consumer-grade devices. Removing a dead battery means additional costs for the patient and exposes them to the risk of the implant site contracting an infection or other complications. In addition, energy storage and charging options must account for the patient’s physiological health, while storing the maximum amount of energy and time between replacements.

The most common battery type used in IMDs is the lithium (Li) ion battery, implemented in pacemakers since 1972. Their energy density and the low rate at which they degrade justifies their use in both single-use and long-term IMDs. Rechargeable Li batteries extend the lifespan of devices and reduces the weight the patient has to carry.

Li batteries can be recharged using resonant-inductive. A magnetic field in a charging base transmits energy, and a second magnetic field in the device receives it. Resonant-inductive coupling enables patients to charge their devices without surgery, all while taking advantage of the preexisting electricity sources in their homes.

Graham R Taylor

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