Portable suction device for collecting fluids from a closed wound

Claim 1

A closed wound suction device for collection of fluids from the area of tissue behind a closed wound comprising: a rigid container having an end wall and a peripheral side wall connected thereto, said rigid container having an opening in at least a portion of the end opposite the end wall between the peripheral enclosing side wall; movable piston closure means including a rigid wall for the opening of said container, said closure means being slidably movable in said container from a position in the interior of said container in a direction away from the end wall towards the opening; sealing means for providing an air tight seal between said closure means and said rigid container; a resilient lubricated balloon means located inside of said rigid container between said closure means and said closed end and normally occupying a small volume in an uninflated state, the interior of said balloon means being in fluid communication with the atmosphere; a variable volume pressure collection chamber for receiving the collected body fluids located between the outer surface of said balloon means and the interior surfaces of said container and said closure means; means for moving said closure means from a retracted, inoperative position within the interior of said container to an extended operative position adjacent the open end of said container whereby a negative pressure is created in said pressure collection chamber, the negative pressure in said pressure collection chamber being reduced as a result of the inflation of said balloon means in said pressure chamber such that a controlled vacuum is obtained in said pressure collection chamber; means to retain said closure means in the extended operative position; and port means in said rigid container in fluid communication with said pressure collection chamber and connectable in fluid communication with the closed wound whereby body fluids are drained from the closed wound to said pressure chamber, the negative pressure in said pressure chamber being maintained in said pressure chamber despite the introduction of fluid therein due to the shrinking volume of said balloon means as said balloon means is resiliently urged towards the uninflated position as the fluids enter said pressure chamber.