Basti karma involves administering medicated oils or herbal decoctions through the anal, vaginal, or urinary routes. It is one of the five major Panchakarma purification procedures in Ayurveda. The document discusses the traditional basti yantra or instrument used, which consists of a bastinetra (nozzle) and bastiputaka (receptacle). It provides details on the appropriate materials and dimensions for these parts based on Ayurvedic texts. Defects in the bastinetra and their resulting complications are also outlined.