St. Jude Medical today announced the first patient implant of an Eon Mini, what they are billing as 'the world’s smallest, longest-lasting, rechargeable neurostimulator' to treat chronic pain of the trunk or limbs and pain from failed back surgery.

Adam Hammond, the 26-year-old patient, was implanted with the Eon Mini neurostimulator which is slightly larger than a U.S. silver dollar. Similar in function and appearance to a cardiac pacemaker, the neurostimulator delivers mild electrical pulses to the spinal cord, which interrupt or mask the pain signals’ transmission to the brain.

Hammond is a former member of the U.S. Army “Golden Knights” Parachute Team. Hammond was skydiving while on leave in 2006 when his parachute did not deploy correctly. He hit the ground in excess of 45 miles an hour.

Pictured is Adam Hammond, a former member of the U.S. Army "Golden Knights" Parachute Team, prior to a skydiving accident that left him with life-threating injuries and severe chronic pain. Hammond has become the first person implanted with the world's smallest neurostimulator for chronic pain. Photo courtesy of St. Jude Medical Inc.

“As soon as I hit the ground, I thought, ‘God, please don’t let me die,’” said Hammond of Chillicothe, Ohio, whose numerous injuries included a broken femur, shattered pelvis and a severed spine. He spent the next two years undergoing multiple surgeries and physical therapy, but chronic pain from his injuries impacted his rehabilitation.

“Neurostimulation helps us control Adam’s pain so he can continue his rehabilitation and decrease his pain medications,” said Tim Deer, M.D., president and CEO, Center for Pain Relief in Charleston, W.Va. “Our main goal is to use spinal cord stimulation to help him return to his everyday activities and become a vital part of society again.”

The Eon Mini neurostimulator has a thin 10 mm profile and weighs 29 grams (approx. 1.0 oz). Its small size allows for a smaller incision, giving the physician increased control and flexibility in selecting the implant location.

Even with its small size, the Eon Mini neurostimulator has the longest-lasting battery life of any rechargeable spinal cord stimulation (SCS) device in its class. It is the only small rechargeable neurostimulator to receive a 10-year battery life approval by the U.S. Food and Drug Administration (FDA). For patients this means the device should provide sustainable therapy and maintain a reasonable recharge interval for 10 years of use at high settings. The device’s battery longevity may also mean that patients require fewer battery replacement surgeries.

Because the charging system is fully portable, the Eon Mini neurostimulator allows patients the freedom to comfortably recharge the device’s battery while taking a walk, cooking a meal or shopping.

“I already have significant pain relief,” said Hammond. “I’m now able to walk twice as far, and I recently went to the movies with my best friend. It feels good to start getting my life back.”

Pain is a serious and costly public health issue, and it remains largely under-treated and misunderstood. According to the National Institutes of Health, 90 million people in the U.S. suffer from chronic pain. The American Pain Foundation estimates that chronic pain costs approximately $100 billion per year in lost work time and healthcare expenses.

More than 35,000 patients in 35 countries have been implanted with St. Jude Medical neurostimulation systems. Patients can obtain more information about neurostimulation pain therapies at

The Eon Mini neurostimulator has received FDA and European CE Mark approvals. The device will be available this fall (2008).