The catheter includes a user controlled incontinence portion that is combinable with a combination inflation/drainage member. The inflation/drainage member can be detached from the incontinence portion to provide a user controlled device. A magnetic valve is incorporated in the user controlled incontinence...http://www.google.co.uk/patents/US5041092?utm_source=gb-gplus-sharePatent US5041092 - Urethral indwelling catheter with magnetically controlled drainage valve and method
