What Is Axonics Therapy For Bowel And Bladder?

Axonics therapy is a medical treatment that uses a small implanted device to stimulate the sacral nerve. This nerve plays a key role in bladder and bowel control. The stimulation helps restore normal function in patients with overactive bladder, fecal incontinence, or urinary retention when other treatments have not worked. It is a form of sacral neuromodulation, similar to pacemaker technology but designed for pelvic organs.

What Is Axonics Therapy For Bowel And Bladder?

Axonics therapy refers specifically to a sacral neuromodulation system made by Axonics, Inc. The device is implanted under the skin in the upper buttock area. A thin wire (lead) delivers mild electrical pulses to the sacral nerve, which sits near the tailbone. This nerve sends signals between the spinal cord and the bladder, bowel, and pelvic floor muscles. By modulating those signals, the therapy can reduce urgency, frequency, and leakage, and help the bowel empty more completely. It is FDA-approved for treating overactive bladder, fecal incontinence, and non-obstructive urinary retention.

How Does Axonics Therapy Work?

The sacral nerve is part of the network that controls bladder and bowel function. When the nerve signals become overactive or uncoordinated, symptoms like sudden urgency, frequent urination, or accidental bowel leakage can occur. The Axonics implant delivers low-level electrical pulses to the nerve. This resets the nerve’s activity, calming overactive signals and improving coordination between the bladder, sphincter, and bowel muscles. The patient does not feel the stimulation under normal conditions. The device can be turned on, off, or adjusted using a handheld remote control or a smartphone app.

The therapy is not a cure. It manages symptoms by changing how the nerve behaves. For most patients, symptom improvement begins within days to weeks after the device is turned on, but full benefit may take several months.

What Conditions Does Axonics Treat?

Axonics therapy is approved for three main conditions:

• Overactive bladder (OAB) — symptoms include sudden strong urges to urinate, frequent trips to the bathroom day and night, and urge incontinence (leaking urine after a strong urge).
• Fecal incontinence — accidental leakage of solid or liquid stool, often due to weak sphincter muscles or nerve damage.
• Non-obstructive urinary retention — difficulty emptying the bladder completely even though there is no physical blockage. This can cause chronic bladder distension and infections.

The device is not used for stress incontinence (leakage with cough or sneeze), neurogenic bladder from spinal cord injury, or structural problems like tumors or urethral strictures. Those conditions require different treatments.

Who Is a Candidate for Axonics Therapy?

Candidates are typically people who have tried more conservative treatments first. This includes pelvic floor exercises, bladder training, dietary changes, and medications. If these do not provide adequate relief or cause side effects, sacral neuromodulation may be considered.

Doctors also evaluate overall health. The procedure requires surgery, so patients must be healthy enough to undergo implantation. People with uncontrolled bleeding disorders, active infections, or who are pregnant are not candidates. A successful trial phase (two-stage procedure) is required before the permanent device is implanted.

What Does the Procedure Involve?

The therapy is delivered in two stages.

Stage 1: Test lead placement. Under local or general anesthesia, the doctor places a thin wire (lead) next to the sacral nerve. The wire is connected to a temporary external stimulator. For 1 to 2 weeks, the patient records their symptoms to see if the stimulation improves bladder or bowel control. This is called the trial phase. If symptoms improve by 50% or more, the person is considered a responder and can proceed to stage 2.

Stage 2: Implant placement. The temporary external stimulator is removed and a small, rechargeable pulse generator is implanted under the skin in the upper buttock. The lead is connected to the generator. The entire procedure usually takes about 30 to 60 minutes and is done as an outpatient visit. The device is programmed by a clinician and can be adjusted by the patient within limits set by their doctor.

Recovery is generally quick. Most people return to normal activities within a few days but are advised to avoid heavy lifting or bending for a couple of weeks.

What Is the Evidence for Axonics Therapy?

Clinical trials have shown that sacral neuromodulation significantly reduces symptoms in a majority of patients with OAB and fecal incontinence. For example, one large prospective study of the Axonics system reported that many patients achieved at least a 50% reduction in severe incontinence episodes at 6 months and maintained improvement at 2 years. Evidence for urinary retention is more limited but suggests benefit in some patients.

Compared to older systems, the Axonics device has a longer battery life (claimed to last 15 years or more, depending on settings) and is designed to be fully MRI-conditional, meaning patients can undergo MRI scans under certain conditions. The device is rechargeable, requiring about one hour of charging per week. Real-world registry data continue to support its safety and effectiveness.

What Are the Risks and Side Effects?

As with any implant, there are risks. The most common include infection at the implant site, pain, and lead displacement. Some patients report temporary discomfort, bruising, or tingling after surgery. In rare cases, the device may need to be removed due to infection or lack of benefit. The stimulation can sometimes cause unintended effects such as leg pain, muscle twitching, or changes in bowel or bladder function. These can usually be resolved by reprogramming the device.

There is no evidence that sacral neuromodulation causes long-term nerve damage. The therapy is reversible: the device can be turned off or removed at any time, and the nerve typically returns to its original state within days to weeks.

How Does Axonics Compare to Other Treatments?

Treatment options for OAB and fecal incontinence range from conservative to more invasive. First-line treatments include behavioral therapy (pelvic floor exercises, timed voiding) and medications like anticholinergics or beta-3 agonists. If those fail or cause side effects, second-line options include percutaneous tibial nerve stimulation (PTNS), botulinum toxin (Botox) injections into the bladder, or sacral neuromodulation.

PTNS is less invasive (needle in the ankle) but requires weekly visits for 12 weeks and then maintenance sessions. Botox injections work for about 6 to 9 months and then need to be repeated. Sacral neuromodulation offers a one-time implant that can provide continuous benefit for many years. However, it requires surgery and has a higher upfront cost. The choice depends on patient preference, symptom severity, and what has been tried before.

Among sacral neuromodulation devices, the Axonics system differs from Medtronic’s InterStim mainly in battery life (Axonics is rechargeable, InterStim is not) and MRI safety (Axonics is approved for full-body MRI under certain conditions; older InterStim models are not). Both devices work on the same principle and have similar effectiveness. Some clinicians prefer Axonics for younger, more active patients who might need multiple MRI scans over their lifetime.

What About Cost and Insurance Coverage?

Axonics therapy is covered by Medicare for eligible patients with OAB or fecal incontinence who meet specific criteria. Most private insurance plans also cover it, though prior authorization is usually required. Out-of-pocket costs vary widely depending on deductibles and copays. The device and procedure together can cost tens of thousands of dollars, but insurance covers the bulk when criteria are met. Patients should contact their provider for a precise estimate of their financial responsibility.