What is sacral neuromodulation?
Sacral neuromodulation surgery is an advanced, minimally invasive treatment that uses low-level electrical impulses to regulate communication between the sacral nerves and the bladder, bowel, and pelvic floor muscles. This therapy is also known as a bladder pacemaker. It has helped thousands of patients worldwide regain control when medications and conservative treatments have failed.
In concept, SNM echoes traditional Chinese acupuncture: both methods act on sacral neural pathways to restore pelvic floor and bladder function, though SNM uses implantable electrodes for continuous modulation. This sacral nerve electrical stimulation procedure is performed with precise targeting.
Dr. Zhang Yifei, Director of the Urinary Control Unit at the First Affiliated Hospital of Anhui Medical University and Director of the National Sacral Neuromodulation surgery Clinical Demonstration Center, has been performing this sacral nerve electrical stimulation procedure for over 15 years with a high success rate.
Is SNM Right for You? – Conditions Treated
SNM is a clinically approved treatment for the following conditions:
- Refractory Overactive Bladder – including urgent, frequent urination and urge leakage
- Neurogenic Bladder – bladder dysfunction caused by spinal cord injury, stroke, or Parkinson's disease
- Interstitial Cystitis – chronic bladder wall inflammation with pain and pressure
- Chronic Pelvic Pain Syndrome – persistent pelvic pain not attributed to other causes
- Urge Urinary Incontinence – sudden, uncontrollable leakage of urine
- Non-obstructive Urinary Retention – inability to fully empty the bladder without physical blockage
- Fecal Incontinence and Refractory Constipation – loss of bowel control or severe constipation
These conditions – including treatment-resistant overactive bladder, bladder dysfunction of neurogenic origin, bladder pain syndrome, and persistent pelvic pain condition – are all responsive to SNM as an advanced therapy regimen for urinary incontinence. Many patients refer to this treatment as a bladder pacemaker when discussing their options.
You May Benefit from SNM if You Experience：
Urinating more than 8 times during the day or waking up more than twice at night
√Sudden, intense urges to urinate that are difficult to control
√Involuntary leakage of urine or stool
√Inability to empty your bladder completely, with a high post-void residual
√Persistent pelvic pain or discomfort that has not responded to medication
√Previous treatments (medications, physical therapy) have provided insufficient relief
If you have been diagnosed with any of the above conditions, this sacral nerve stimulator therapy could be your solution.
How Does SNM Work? – Two Stages
Stage 1 – Test Stimulation
A temporary electrode is inserted near the sacral nerve under local anesthesia. This test stimulation is a short-term sacral nerve stimulator trial. The patient wears an external stimulator for about 2 weeks to evaluate symptom improvement. This minimally invasive procedure is performed with precise targeting under fluoroscopic guidance, typically completed within one hour.
*Minimally invasive | No general anesthesia | Precise targeting | 1-hour procedure*
This test confirms whether the permanent device will work for you.
Stage 2 – Permanent Implant
If Stage 1 achieves ≥50% symptom improvement, the permanent neurostimulator is implanted subcutaneously. This bladder stimulator device is fully programmable, allowing physicians to adjust stimulation parameters non-invasively over time.
Reversible | Adjustable | Long-lasting | Programmable | Non-invasive follow-up
Why Choose Dr. Zhang Yifei for Your SNM Procedure?
Directly responsible for the National Engineering Laboratory for Neuromodulation – Sacral Neuromodulation surgery Clinical Demonstration Center
Over 30 years of clinical experience in urology, neuro-urology, and pelvic floor disorders
Pioneer of the minimally invasive staged SNM protocol, with consistently high patient satisfaction rates
Capable of providing online consultation and treatment planning for overseas Chinese patients via secure video consultation
Frequently Asked Questions (FAQ)
1.Is urinary incontinence a normal part of aging?
No. Although it is more common in older adults, it is not inevitable. In most cases, effective treatments are available regardless of age. Many patients over 70 have achieved complete continence after appropriate therapy.
2.Can incontinence be treated without surgery?
Yes. Mild to moderate stress incontinence often responds to pelvic floor muscle training (Kegel exercises) and biofeedback. Urge incontinence can be managed with medications and behavioral interventions. Surgery (e.g., mid-urethral sling or SNM) is only recommended for patients who do not improve with conservative treatments. SNM serves as an advanced option for refractory cases; it is sometimes called a bladder stimulator.
3.I live abroad. How can I consult Dr. Zhang?
Dr. Zhang offers standardized remote consultations for overseas patients. Please prepare recent urinalysis, ultrasound reports, and a brief symptom description. The consultation is conducted via secure video, and a written treatment plan will be provided. If you choose to travel to China for surgery, the hospital's international patient service team can assist with travel arrangements.
4.I have frequent urination, urgency, and pain. Is it always a UTI? Do I need SNM?
Not necessarily. Acute symptoms are most commonly caused by a UTI or stones. A urinalysis and ultrasound should be performed first. If symptoms persist after anti‑infection treatment and organic disease is ruled out, the condition may be treatment-resistant overactive bladder or chronic bladder inflammation. In such cases, SNM (colloquially called a bladder pacemaker) can significantly improve symptoms as part of an advanced treatment approach. Dr. Zhang will determine whether a test stimulation is appropriate.
5.Do patients with neurogenic voiding dysfunction have to use an indwelling catheter for life?
Not necessarily. The goals are to protect upper urinary tract function and improve voiding symptoms. In addition to intermittent or indwelling catheters, SNM has been shown to be effective in selected patients with bladder dysfunction caused by nerve damage, helping restore some voiding reflexes and reduce post‑void residual volume. Dr. Zhang's center has successfully implanted the device in many patients with spinal cord injury or Parkinson's disease‑related bladder neurogenic disorders, enabling them to discontinue long‑term catheterization.
6.What is treatment-resistant overactive bladder? What if medications fail?
This condition is defined as persistent urgency, frequency, or urge incontinence despite at least 12 weeks of behavioral therapy and treatment with two or more anticholinergics or beta‑3 agonists. At this stage, SNM is internationally recognized as a preferred therapy. Through the two‑stage process, test stimulation accurately determines if the device is right for you. If effective, a permanent implant can reduce daytime urination frequency by more than 50% in most patients.
7.I have long‑term difficulty with defecation – straining but unable to empty completely. Could this be related to pelvic nerves?
Yes. After ruling out structural narrowing or tumors, this type of "defecation difficulty" is often due to refractory constipation or outlet obstruction constipation, which involves pelvic floor muscle coordination regulated by sacral nerves. SNM is effective not only for voiding dysfunction but also for fecal incontinence and refractory constipation. Dr. Zhang can perform anorectal manometry and balloon expulsion testing to determine candidacy.
8.What is the difference between dysuria and urinary retention? When is surgery needed?
Dysuria refers to straining, a weak stream, or hesitancy. Urinary retention means the bladder cannot empty completely (post‑void residual often >100 mL) or at all. For non‑obstructive urinary retention (e.g., diabetic bladder, sacral cord injury), SNM is also indicated. As a bladder stimulator, it can significantly reduce residual volume and decrease the need for intermittent catheterization. If conservative treatments fail, test stimulation should be considered.