Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.
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| Number | Title | Issue Date |
| 3991768 | Shunt system resistant to overdrainage and siphoning and valve therefor A physiological shunt system for draining fluid from one region of the human body and discharging it into another in which means is included to resist overdrainage or siphoning of the region as a consequence of low downstream pressures, and a valve to pro... | 11/16/1976 |