[Principles of continence in women: the formula of continence].

Urinary incontinence in women is a widespread disease . In recent years, significant progress in its treatment was achieved. Despite this, the mechanisms of continence are still poorly understood. According to the principles of biomechanics, incontinence occurs when bladder pressure exceeds urethra pressure. We represent the formula for calculating the pressure loss of urine, which takes into account the main factors involved in the formation of urethral pressure. According to our data, the involuntary leakage of urine during physical conditions may occur if the bladder pressure exceeds intraurethral pressure, which can be calculated using a formula based on urethral closing pressure and passive resistance of the bladder neck.