Patent ID: 6179586
Filing Date: 2001-01-30
Classification: A61M,F04B

Abstract:
A diaphragm pump, comprising:a pump body having a pump chamber formed therein;a first diaphragm having a first set of valve holes in the diaphragm surface thereof and a second diaphragm having a second set of valve holes in the diaphragm surface thereof;at least one inlet port and at least one outlet port in said pump body for communication with said pump chamber, said at least one inlet and outlet ports being positioned for sealing contact with one of said first and second diaphragms at a point nonaligned with said holes in said diaphragm; anda driver for actuating said first and second diaphragms to cause diaphragm movement to a plurality of diaphragm positions to control flow of fluid through said pump;a first of said diaphragm positions being said first and second diaphragms spaced from one another and from at least one inlet and outlet ports to permit flow of fluid through said pump chamber;a second of said diaphragm positions being said first diaphragm and said second diaphragm in diaphragm surface contact, said first and second set of holes being mutually nonaligned to permit said diaphragm surfaces to form a seal when in said diaphragm surface contact; anda third of said diaphragm positions being at least one of said first and second diaphragm in diaphragm surface contact with said at least one inlet and outlet ports to form said sealing contact.