The goal of this study is to investigate the safety and effectiveness of a new implanted device designed to treat Urinary Urgency-Frequency Syndrome.

Key Inclusion criteria:

• Age 18 years and above.
• Diagnosed with urinary urgency-frequency syndrome.
• Have no reported history of urethral obstruction/stricture, bladder calculi or bladder tumor.
• Have normal upper urinary tract function.
• Be capable of giving informed consent.
• Be capable and willing to follow all study related procedures.

Key Exclusion Criteria:

• Have any active implantable device regardless of whether stimulation status is ON or OFF.
• Are pregnant as confirmed by a urine pregnancy test or plan to become pregnant during the following 12 month period.
• Less than one year post partum and/or are breast-feeding.
• Have any large passive implant that contains metal located within 30 cm of the chair pad while seated (e.g., hip replacement).
• Have conditions requiring magnetic resonance imaging (MRI) evaluation.
• Have conditions requiring diathermy procedures.
• Have an inability to operate the bion Remote Control and bion Recharging System either by self or caregiver.
• Have diabetes with peripheral nerve involvement or have severe uncontrolled diabetes.
• Have history of coagulopathy or bleeding disorder.
• Have pelvic pain in the absence of voiding dysfunction.
• Have anatomical restrictions such that the study device placement is not possible.
• Are currently participating or have participated within the past 30 days in any clinical investigation involving or impacting urinary or renal function.
• Cannot independently comprehend and complete the questionnaires.