Peristaltic pump tube cassette for blood processing systems

A liquid flow cassette comprising

• a housing having an interior,
• first and second pump ports on the housing,
• a flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump rotor,
• a liquid port on the housing attachable to a length of tubing that extends outside the housing interior, and
• a first series of cavities within the housing interior forming liquid conveying paths including
• a primary path communicating with the liquid port,
• a first branch path communicating with the first pump port, and
• a second branch path communicating with the second pump port,
• a second series of cavities within the housing interior forming valve stations operative in response to the application of external force for controlling liquid passage between the first primary path and either one of the branch paths, and
• another cavity formed within the housing interior along one of the first branch path and second branch path defining a sensing station that transmits liquid pressure to an external sensing element.

A liquid flow cassette comprising

• a housing having sides walls enclosing an interior,
• first and second pump ports on one side wall of the housing, third and fourth pump ports on the side wall of the housing opposite to the one side wall,
• a first flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with a first external peristaltic pump rotor,
• a second flexible tubing loop that extends between the third and fourth pump ports outside the housing for engagement with a second external peristaltic pump rotor,
• a first liquid port on a side wall of the housing attachable to a length of tubing that extend outside the housing interior,
• a first series of cavities formed within the housing interior including
• a first primary path that communicates with the first liquid port, and
• first, second, third, and forth branch paths communicating, respectively, with the first, second, third, and fourth pump ports, and
• a second series of cavities formed within the housing interior to form valve means including diaphragms that flex independent of each other in response to the application of external force for establishing liquid flow communication between the first primary path and any one of the branch paths.

A liquid flow cassette comprising

• a housing having sides walls enclosing an interior,
• first and second pump ports on one side wall of the housing, third and fourth pump ports on the side wall of the housing opposite to the one side wall,
• a first flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with a first external peristaltic pump rotor,
• a second flexible tubing loop that extends between the third and fourth pump ports outside the housing for engagement with a second external peristaltic pump rotor,
• a first liquid port on the one housing side wall attachable to a length of tubing that extends outside the housing interior,
• a second liquid port on the opposite housing side wall attachable to another length of tubing that extends outside the housing interior,
• a first series of cavities formed within the housing interior including
• a first primary path that communicates with the first liquid port,
• a second primary path the communicates with the second liquid port, and
• first, second, third, and forth branch paths communicating, respectively, with the first, second, third, and fourth pump ports, and
• a second series of cavities formed within the housing interior to form valve means including diaphragms that flex independent of each other in response to the application of external force for establishing liquid flow communication between the first primary path and any one of the branch paths while establishing liquid flow communication between the second primary path and any remaining one of the branch paths.

A liquid flow cassette comprising

• a housing having an interior wall that divides the housing into a first interior area and a second interior area,
• first and second pump ports on the housing,
• a liquid conveying port on the housing, and
• liquid passages formed within the first interior area and communicating with the liquid conveying port, the first pump port, and the second pump port,
• valve means formed within the second interior area for controlling liquid flow through the liquid passages,
• a sensing means formed within the second interior area for sensing liquid pressure within at least one liquid passage,
• a first wall comprising an essentially rigid panel that overlies the first interior area and externally seals the liquid passages,
• a second wall that overlies the second interior area and externally seals the valve means and sensing chamber, the second wall including means associated with the valve means for controlling liquid passage in response to forces applied by an external valve element, the second wall also including means associated with the sensing chamber for transmitting information regarding liquid pressure present within the one liquid passage to an external sensing element, and
• a flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump element.

A liquid flow cassette comprising

• a housing having an interior wall that divides the housing into a first interior area and a second interior area,
• first and second pump ports on the housing,
• a flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump element,
• a liquid port on the housing attachable to a length of tubing that extends outside the housing interior, and
• liquid passages occupying the first interior area and communicating with the liquid port, the first pump port, and the second pump port,
• valve means occupying the second interior area for controlling liquid flow through the liquid passages,
• a sensing chamber occupying the second interior area and communicating with at least one liquid passage,
• a first wall comprising an essentially rigid panel that overlies the first interior area and externally seals the liquid passages, and
• a second wall that overlies the second interior area and externally seals the valve means and sensing chamber, the second wall including first diaphragm means associated with the valve means for flexing with respect to the valve means to control liquid passage in response to forces applied by an external valve element, the second wall also including second diaphragm means associated with the sensing chamber for transmitting information regarding liquid pressure present within the one liquid passage to an external sensing element.

A liquid flow cassette comprising

• a housing having an interior wall that divides the housing into a first interior area and a second interior area,
• first and second pump ports on the housing,
• a liquid conveying port on the housing, and
• liquid passages formed within the first interior area and communicating with the liquid conveying port, the first pump port, and the second pump port,
• valve means formed within the second interior area for controlling liquid flow through the liquid passages,
• a sensing means formed within the second interior area for sensing liquid pressure within at least one liquid passage,
• a first wall that overlies the first interior area to both externally seal the liquid passages and internally seal the liquid passages from communication with one another,
• a second wall that overlies the second interior area and externally seals the valve means and sensing chamber, the second wall including means associated with the valve means for controlling liquid passage in response to forces applied by an external valve element, the second wall also including means associated with the sensing chamber for transmitting information regarding liquid pressure present within the one liquid passage to an external sensing element, and
• a flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump element.

A liquid flow cassette comprising

• a housing having an interior wall that divides the housing into a first interior area and a second interior area,
• first and second pump ports on the housing,
• a liquid conveying port on the housing, and
• liquid passages formed within the first interior area and communicating with the liquid conveying port, the first pump port, and the second pump port,
• valve means formed within the second interior area for controlling liquid flow through the liquid passages,
• a sensing means formed within the second interior area for sensing liquid pressure within at least one liquid passage,
• a first wall that overlies the first interior area to externally seal the liquid passages,
• a second wall that overlies the second interior area to both externally seal the valve means and sensing chamber and internally seal the valve means and sensing means from communication with one another, the second wall including means associated with the valve means for controlling liquid passage in response to forces applied by an external valve element, the second wall also including means associated with the sensing chamber for transmitting information regarding liquid pressure present within the one liquid passage to an external sensing element, and
• a flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump element.

A liquid flow cassette comprising

• a housing having an interior wall that divides the housing into a first interior area and a second interior area,
• first and second pump ports on the housing,
• a flexible tubing loop that extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump element,
• a liquid port on the housing attachable to a length of tubing that extends outside the housing interior, and
• liquid passages occupying the first interior area and communicating with the liquid port, the first pump port, and the second pump port,
• valve means occupying the second interior area for controlling liquid flow through the liquid passages,
• a sensing chamber occupying the second interior area and communicating with at least one liquid passage,
• a first wall that overlies the first interior area to both externally seal the liquid passages and internally seal the liquid passages from communication with one another, and
• a second wall that overlies the second interior area and externally seals the valve means and sensing chamber, the second wall including first diaphragm means associated with the valve means for flexing with respect to the valve means to control liquid passage in response to forces applied by an external valve element, the second wall also including second diaphragm means associated with the sensing chamber for transmitting information regarding liquid pressure present within the one liquid passage to an external sensing element.