Fluid metering with a disposable membrane type pump unit
1 Assignment
0 Petitions
Accused Products
Abstract
A disposable pump unit (100) for receiving and metering a predetermined volume of fluid has a body with a surface at which opens the mouth of a cavity (7) formed in the body. An inlet port (4) for the fluid opens at the surface adjacent to the mouth of the cavity (7) and a plurality of outlets (9) are provided in the cavity (7) that open to a fluid flow passageway extending through the body and connecting the cavity (7) to an outlet port (10). A flexible membrane (8) overlies the cavity (7), the inlet port (4) and the outlet port (10) and is sealingly secured at its periphery to the surface. A re-usatile pump actuating unit (200) is co-operable with the pump unit (100) to position the membrane (8) between the cavity (7) in the pump unit (100) and a matching cavity (21) in the actuating unit (200). The membrane (8) is towards and away from the cavity (7) by connecting the cavity (21) to a source of positive and negative fluid pressure via a port (18). The actuating unit (200) has an armature (19) operable to displace the membrane (8) to close the inlet port (4) when the outlet port (10) is open and an armature (20) operable to displace the membrane (8) to close the outlet port (10) when the inlet port (4) is open. In use, the pump unit (100) draws fluid into the cavity (7) when the inlet port (4) is open and a negative fluid pressure is applied to the chamber (21) and pumps the fluid out of the cavity (7), when the inlet port (4) is closed and a positive fluid pressure is applied to the chamber (21).
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Citations
61 Claims
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1-30. -30. (canceled)
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31. A disposable pump unit for receiving and metering a predetermined volume of fluid, the pump comprising a body, the body having a surface at which opens the mouth of a cavity formed in the body, an inlet port for connection with a reservoir of fluid and opening at the body surface adjacent to the mouth of the cavity whereby, when the inlet port is open when the pump is being filled with fluid from the reservoir, fluid can flow from the inlet port into the cavity via the mouth thereof, an outlet port for the fluid and opening at the body surface, and a fluid flow passageway extending through the body and connecting the cavity to the outlet port;
- and flexible membrane means sealingly secured at its periphery to the body surface and having a first portion overlying the cavity and the inlet port and a second portion overlying the outlet port, the flexible membrane means whereat it overlies the inlet and outlet ports being moveable against the ports to close the ports.
- View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
Specification