Equipment for medical or surgical uses is provided for purposes, for example, of withdrawing or draining body liquids from cavities tending to accumulate such liquids, for instance as a result of wounds, surgical procedures or of pathological conditions in the body. The equipment comprises a vacuum chamber...http://www.google.ca/patents/US4135515?utm_source=gb-gplus-sharePatent US4135515 - Medical/surgical suction equipment
