Gastrointestinal aspirator pump

Claim 1

An aspirator-pump and tube combination for evacuating liquid from an intestinal cavity wherein debris or tissue can block the evacuating means comprising: a. air pump means with connections to supply both positive and negative pressure (relative to atmospheric) air; b. a multi-lumen tube adapted to be inserted into said cavity having a positive air pressure lumen connected to the positive air connection of said pump and a negative pressure lumen connected to the negative pressure connection of said pump; c. means including valves and a timer for supplying positive pressure air from said pump to said positive air pressure lumen for a measured period of time; d. means for withdrawing liquids from said cavity comprising walls forming a negative pressure opening in said negative pressure lumen communicating with said cavity, and e. means for moving debris or tissue away from said negative pressure opening comprising walls in said positive air pressure lumen forming a positive air pressure opening, and additional walls supporting said positive air pressure opening in position to project air against said debris or tissue blocking the negative pressure opening during said period.