PURPOSE: The present study examined the effects of a miniature, implantable, wireless stimulation device for treating stress urinary incontinence (SUI) in rats. METHODS: Twenty-four female Sprague-Dawley rats were randomly assigned to three groups: Group 1 (Control), Group 2 (Sham), and Group 3 (Stimulation). All animals underwent vaginal distension (VD) to mimic postpartum SUI. Groups 2 and 3 were implanted with a stimulator in the pelvic floor muscle, but only Group 3 received continuous stimulation for two weeks. Multiple cystometrograms (CMGs) were performed to determine the leak point pressure (LPP) and maximal bladder capacity (MBC). RESULTS: In the rat model, LPP in Group 1 after VD and after two weeks decreased significantly from baseline (21.1 ± 2.5 and 30.8 ± 5.2 vs. 52.5 ± 6.3 cmH CONCLUSIONS: The current study demonstrated the effectiveness of the implantable stimulation device for treating SUI in a rat model. Further studies are needed to determine its long-term safety and action mechanism.