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Home AIMD Companies Advanced Neuromodulation Systems (ANS) St. Jude’s (ANS) Rechargeable Spinal Cord Stimulators Eon and Eon Mini

St. Jude’s (ANS) Rechargeable Spinal Cord Stimulators Eon and Eon Mini

St Jude Medical Eon and Eon Mini Spinal Cord Stimulators

In 2005, St. Jude Medical purchased Advanced Neuromodulation Systems (ANS) in Plano, Texas.  ANS had developed a number of spinal cord stimulation IPGs that were either externally powered via inductive link, internally powered by a primary cell, or internally powered by a transcutaneously rechargeable lithium-ion cell.

Today, the most popular St. Jude spinal cord stimulators are the rechargeable 42 cc Eon and 18 cc Eon mini neurostimulators.

They are constant-current devices with a rated longevity of 10 years. Current through up to 16 electrodes is programmable between 0-25.5 mA with a pulse width of 50-500 µs and a frequency between 2-1200 Hz.

In Eon, the coil that receives transcutaneous energy for battery recharge is located outside of the IPG’s titanium enclosure.  The coil is embedded within an elastomeric plate that is adhered to the titanium can.  In contrast, the enclosure of Eon mini is made of titanium 6-4 (Titanium Grade 5, also known as Ti6Al4V, Ti-6Al-4V) which allows the coil to be placed within the hermetic enclosure.  This is because Titanium 6-4 has much higher resistivity than pure titanium, which drastically lowers eddy currents induced by the recharge system on the can.  To minimize the losses caused by currents induced on the IPG’s can, the frequency of the recharge signal  for Eon mini was set at 50 kHz.  This is in contrast to the 2 MHz recharge frequency of Eon.

St. Jude Medical’s website is at:  www.sjm.com

Transcutaneous energy transmission frequencies for the Eon and Eon Mini SCS IPGs



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1 Comment  comments 

One Response

  1. Diane Pennestri

    I fine the smallest of these units to fit my body well and they are fantastic to use. I would recommend these for anyone who asks. I have recommended them already to a few people who have asked about them. They have found that I am right. This is a true invention of greatness and very helpful with pain. The greatest part is that you don’t have to take as many pain pills as you once did before. This is great in many ways! I want to thank all of you who have had a hand in the invention of the implants. You can recommend people to talk to me for advice with regard to using this implant. I would be happy to do so.Thanks again,Diane L. Pennestri.