Basti yantra (instrument used for administration of enema)
Some logic can be given in favour of using classical Metal basti netra with polythene bag basti putaka as follows- A. Basti is intended to reach complete large intestine up to caecum. Thus two factors are very much needed 1. Administering sufficient fluid volume more than minimum 240 ml as it is maximum tolerated rectal volume in adult person. if it is administered in low volume then basti may not even cross the rectum.
2. Basti need to be administered with generous force to generate mild reverse peristalsis/ retroperistalsis which actually takes basti content higher up to the ceacum and may be upto terminal ileum. That is why basti is contraindicated in empty stomach and also not to be given with a great force as this may amplify the retroperistalsis due to hyper-irritation of bowel and direct contact of basti content to mucosa may further irritate it. Terminal ileum and duodenum are known for their retroperistaltic potential, thus basti content may come out of mouth due to stimulation of vomiting centre in this mechanism if classical method is followed but in improper way. However retroperistalsis set in colon and normal peristaltic wave coming from stomach and small intestine is actually responsible for churning of Basti, Mala and Dosha in colon which is actual intended effect of Niruha Basti. This is reason behind asking patient to take food immediately after Niruha evacuation to prevent excess retroperistaltic wave to avoid Pratiloma Gati of Vata.