Pumping cartridge including a bypass valve and method for directing flow in a pumping cartridge

A pumping cartridge comprising:

• a first component;
• at least one membrane disposed on the first component, the first component and the membrane defining a bypass valving chamber, said bypass valving chamber including three ports, two of which ports are occludable by said flexible membrane;
• a first fluid flow path entering the bypass valving chamber through a first port and exiting the bypass valving chamber through a third occludable port;
• and
• a second fluid flow path entering the bypass valving chamber through a second occludable port and exiting the bypass valving chamber through said first port.

A reusable system constructed and arranged for operative association with a removable pumping cartridge, which pumping cartridge providing at least two fluid flow paths therein and including a bypass valving chamber in fluid communication with a first fluid flow path and a second fluid flow path, the system including:

• a pump housing component constructed and arranged to couple to said pumping cartridge;
• and
• a valve actuator adapted to actuate said bypass valving chamber to selectively permit fluid flow through
• said first fluid flow path while restricting fluid flow through said second fluid flow path,
• said second fluid flow path while restricting fluid flow through said first fluid flow path, and
• to prevent fluid flow through both said first fluid flow path and said second fluid flow paths, wherein
• said actuator is disposed within said pump housing adjacent to and in operative association with said bypass valving chamber when said pumping cartridge is coupled to said pump housing.

A reusable system constructed and arranged for operative association with a removable pumping cartridge, which pumping cartridge providing at least two liquid flow paths therein and including a first component, and at least one membrane disposed on the first component, where the first component and the membrane define a bypass valving chamber, said reusable system comprising:

• a pump housing component constructed and arranged for operative association with said pumping cartridge by coupling to the pumping cartridge;
• a valve actuator to actuate said bypass valving chamber, said actuator disposed adjacent to and in operative association with said bypass valving chamber when said pumping cartridge is coupled to said pump housing;
• and
• a force applicator forming at least a part of said valve actuator, said force applicator constructed and arranged to alternatively (i) apply a force to at least a portion of said membrane to restrict liquid flow through a first liquid flow path through said bypass valving chamber while permitting liquid flow through a second liquid flow path through said bypass valving chamber, (ii) apply a force to at least a portion of said membrane to restrict liquid flow through said second liquid flow path through said bypass valving chamber while permitting liquid flow through said first liquid flow path through said bypass valving chamber, and (iii) apply a force to at least a portion of said membrane to restrict liquid flow through both said first and said second liquid flow paths.

A method for directing flow in a pumping cartridge, said pumping cartridge including a bypass valving chamber, having three ports therein and two liquid flow paths therethrough, where at least a portion of which bypass valving chamber is formed from a membrane, the method comprising:

• occluding a first port disposed in said bypass valving chamber with said membrane to restrict a flow of liquid through said bypass valving chamber along a first flow path while permitting liquid flow through said bypass valving chamber along a second liquid flow path;
• occluding a second port disposed in said bypass valving chamber with said membrane to restrict a flow of liquid through said bypass valving chamber along said second flow path while permitting liquid flow through said bypass valving chamber along said first liquid flow path;
• and
• occluding both said first and said second ports disposed in said bypass valving chamber with said membrane to restrict a flow of liquid along both said first and said second flow paths.