Programming advanced control mechanisms with Lua coroutines

An improved closed irrigation site in a urinary irrigation device. The site is characterized by a rigid lip defining a mouth at the distal end of an irrigation tube, a resilient, impervious membrane against the lip and covering the mouth and having a normally closed, resiliently deformable slit therethrough over the mouth, and a plug or other member securing the membrane against the lip. In preferred embodiments, the membrane is compressed against the lip thereby biasing the slit in a closed position. Other preferred embodiments relate to unique structure providing specific benefits.