What is the primary mechanism by which sacral neuromodulation modulates bladder activity?

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Stimulation of the sacral nerves works mainly by changing the sensory messages that travel from the bladder to the spinal cord, which in turn alters how the micturition reflex is activated. By adjusting afferent signaling, the device can dampen the abnormal reflexes that trigger urge and incontinence during the storage phase, helping the bladder hold urine more effectively. It doesn’t directly block detrusor muscle contractions, nor does it simply boost parasympathetic output to drive emptying, and it isn’t about forcing pelvic floor muscles to contract. The therapeutic action is fundamentally about modulating neural signaling that governs when the bladder should store or void.