FDA Recalls Abbott Stimulators for Technical Malfunction

By Pat Anson, PNN Editor

After receiving reports of dozens of injuries, the Food and Drug Administration has issued a Class I recall for two models of implantable neurostimulators due to a technical malfunction. The recall affects over 155,000 of Abbott’s Proclaim and Infinity devices, which are primarily used in spinal cord and deep brain stimulation.

Although Class I recalls are the most serious type of recall because they may result in injuries or death, patients are not being advised at this time to have the devices surgically removed. The stimulators were implanted in some patients as far back as 2015.

The malfunction occurs when the devices are temporarily turned off when a patient is having magnetic resonance imaging (MRI). There have been 186 complaints of patients being unable to turn the devices back on once the MRI ends, resulting in a loss of therapy and 73 injuries. No deaths have been reported.

In July, Abbott sent an “urgent medical device correction” letter to healthcare providers who install the devices, to clarify instructions on how to exit MRI mode.

The letter also advises providers to tell patients not to delete their device controller’s connection to Bluetooth if a malfunction occurs, and to update their systems and consult with a physician before having an MRI scan.   

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Abbott estimates that only about 0.06% of the recalled devices malfunctioned, with 0.03% of them resulting in loss of therapy and additional surgery.   

The following devices are included in the recall:

• Proclaim XR 5 IPG Model 3660 (previously known as the ‘Proclaim 5 Elite IPG Model 3660’)

• Proclaim XR 7 IPG Model 3662 (Previously known as the ‘Proclaim 7 Elite IPG Model 3662’)

• Proclaim Plus 5 IPG Model 3670

• Proclaim Plus 7 IPG Model 3672

• Proclaim DRG IPG Model 3664

• Infinity 5 IPG Model 6660

• Infinity 7 IPG Model 6662

Implantable neurostimulators are an invasive treatment of last resort for people with chronic back, leg or head pain. The devices are surgically implanted near the spine or brain, and emit low-level electrical impulses to block pain signals.

About 50,000 spinal cord stimulators (SCSs) are implanted annually in the U.S. and their use is growing – in part because of the belief they’ll reduce the need for opioids and other pain therapies. A recent study found that many patients with stimulators did not reduce their use of opioids, epidurals, corticosteroid injections or radiofrequency ablation; and about one in five had complications so severe the devices had to be removed or revised.

A 2018 study found that SCSs have some of the worst safety records of medical devices tracked by the FDA. An FDA review of adverse events involving stimulators found that nearly a third were reports of poor pain relief. The review also identified nearly 500 deaths linked to the devices, along with nearly 78,000 injuries and 30,000 malfunctions.

FDA Expands Use of Spinal Cord Stimulators to More Types of Back Pain

By Pat Anson, PNN Editor

The U.S. Food and Drug Administration continues to expand the use of spinal cord stimulators, despite a growing body of research that questions the safety and effectiveness of the devices.

This month the FDA approved the use of Abbott’s spinal cord stimulators for the treatment of chronic back pain in people who are unable to get corrective surgery – known as non-surgical back pain -- because they are too medically frail or have numerous degenerative disc problems. Those patients are usually treated with pain medication, physical therapy or spinal injections.

FDA approval was granted after a clinical study showed that SCS devices equipped with Abbott's BurstDR technology provided significant pain relief, better physical function, and improved quality of life in 200 patients with non-surgical back pain. The devices are surgically placed near the spine and emit mild electrical impulses to disrupt pain signals before they reach the brain. 

Participants in the study had chronic and disabling back pain for an average of nearly 13 years before getting the devices.

"We have struggled with how to treat people who weren't considered a good surgical candidate because we didn't have clear, data-driven treatment options for non-surgical back pain," Timothy Deer, MD, CEO of the Spine and Nerve Centers of the Virginias, said in an Abbott press release. "This new indication for Abbott's SCS devices, together with BurstDR stimulation, allows physicians the ability to identify and treat a new group of people, providing them with relief from chronic back pain."

BurstDR stimulation uses mild electrical pulses — or bursts — without creating an uncomfortable tingling sensation in the spine known as paresthesia.  All of Abbott's SCS devices use BurstDR technology.

Nine out of ten patients who received BurstDR therapy experienced significantly better function or pain relief, with pain levels reduced an average of nearly 70 percent. The improvements were sustained 12 months after the devices were implanted.

"This FDA expanded indication approval for our SCS devices is a significant step forward in Abbott's goal to provide treatment access to those who suffer daily with chronic back pain but are not eligible for corrective surgery," said Pedro Malha, vice president of neuromodulation for Abbott.

SCS devices were long considered a treatment of last resort for people with severe back, neck and leg pain, but in recent years the FDA has expanded use of the devices for conditions such as painful diabetic neuropathy. The devices are often promoted as safer alternatives than opioid pain medication.

Recent research, however, has raised questions about the safety, efficacy and long-term benefits of the devices. A recent Cochrane review concluded the stimulators work no better than a placebo for treating chronic low back pain, and provide little or no improvement in quality of life.  In a review of 13 clinical trials, researchers found little clinical data on the long-term effectiveness of SCSs, and noted that most of the studies lasted less than a month, were poorly blinded, or funded by device makers.

A 2018 study by investigative journalists found that SCSs have some of the worst safety records of medical devices tracked by the FDA.

A 2020 FDA review of adverse events involving stimulators found that nearly a third were reports of unsatisfactory pain relief. Other common adverse events are nerve damage, infections, and device malfunctions that may lead to further surgeries.

A 2022 study found that patients who get the devices did not reduce their use of opioids, and continued getting medical procedures such as injections, epidurals and radiofrequency ablation.

FDA Approves Smallest Rechargeable Spinal Cord Stimulator

By Pat Anson, PNN Editor

The Food and Drug Administration has approved a new spinal cord stimulator that’s being touted as the smallest implantable neuromodulation device of its kind on the market. Abbott’s Eterna stimulator can also be recharged wirelessly as few as five times a year, unlike other stimulators that need recharging daily or weekly.

Spinal cord stimulators (SCSs) are an invasive treatment of last resort for people with chronic back or leg pain. The devices are surgically implanted near the spine and connected to batteries placed under the skin. The implants send low-level electrical impulses into the spine to block pain signals.

Abbott says it developed Eterna after extensive studies with pain patients and healthcare providers, who wanted a smaller implant with less need for recharging.

Eterna utilizes the company’s BurstDR stimulation, which mimics the natural firing patterns of nerves to provide pain relief without the tingling sensation of other simulators.

"Abbott's low-dose BurstDR stimulation is clinically proven to reduce pain, improve people's ability to perform everyday activities, and reduce emotional suffering associated with pain," Timothy Deer, MD, president and CEO of the Spine and Nerve Centers of the Virginias, said in a statement provided by Abbott.

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"Until now, it wasn't available on a rechargeable device that was this small, and that only needs to be charged a few times a year. This makes a big difference in comfort for many patients who now can have access to the best of both worlds – a small, best-in-class rechargeable device with superior stimulation therapy."

Another advantage of the Eterna SCS system is that patients with the device can still have full-body MRI scans – a critical need for those who need access advanced imaging and diagnostics. The devices can also been monitored and programmed with a mobile app.

About 50,000 SCSs are implanted annually in the U.S. and their use is growing – in part because of the belief they’ll reduce the need for opioids and other pain therapies.

A recent study found that premise to be untrue. Researchers at the University of California San Francisco School of Medicine found that pain patients with stimulators did not reduce their use of opioids, epidurals, corticosteroid injections or radiofrequency ablation compared to a control group. About a fifth of the patients experienced complications so severe the devices had to be removed or revised.

A 2018 study found that SCSs have some of the worst safety records of medical devices tracked by the FDA. An FDA review of adverse events involving stimulators found that nearly a third were reports of poor pain relief. The review also identified nearly 500 deaths linked to the devices, along with nearly 78,000 injuries and 30,000 malfunctions.

SCS’s are no longer limited to patients with intractable back and neck pain. Last year the FDA expanded the use of stimulators to include lower limb pain from diabetic neuropathy.  Stimulators are also being used on patients with Complex Regional Pain Syndrome (CRPS).