Blood processing systems using a peristaltic pump module with valve and sensing station for operating a peristaltic pump tube cassette
First Claim
1. A blood processing assembly comprisinga separation element for separating blood from a source into a first component and a second component,a fluid path for conveying blood between the source and the separation element, the fluid path including an in-line cassette comprisinga 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 pumping element,a liquid port on the housing attachable to a length of tubing that extends outside the housing interior and forms a part of the associated fluid path,liquid passages formed within the first interior area and communicating with the liquid port, the first pump port, and the second pump port, andvalve means formed within the second interior area responsive to the application of external force for controlling liquid flow through the liquid passages and, thus, through the associated fluid path,a sensing chamber formed within the second interior area and communicating with at least one liquid passage in the first interior area,a first generally rigid wall that overlies the first interior area and externally seals the liquid passages, anda second generally flexible wall that overlies the second interior area and externally seals the valve means and the sensing chamber, the second wall flexing in response to external forces applied to control fluid passage through the valve means, the second wall also flexing to transmit information regarding liquid pressure present within the at least one liquid passage to an external sensing element.
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Accused Products
Abstract
A blood processing assembly includes a separation element for separating blood from a source into a first component and a second component. The assembly also includes a fluid path that conveys blood between the source and the separation element. The fluid path includes one or more in-line cassettes that serve in association with peristaltic pumps to centralize pumping and valving functions of the system. The cassettes also serve to segregate the flow paths of the blood components from each other.
359 Citations
20 Claims
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1. A blood processing assembly comprising
a separation element for separating blood from a source into a first component and a second component, a fluid path for conveying blood between the source and the separation element, the fluid path including an in-line 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 pumping element, a liquid port on the housing attachable to a length of tubing that extends outside the housing interior and forms a part of the associated fluid path, liquid passages formed within the first interior area and communicating with the liquid port, the first pump port, and the second pump port, and valve means formed within the second interior area responsive to the application of external force for controlling liquid flow through the liquid passages and, thus, through the associated fluid path, a sensing chamber formed within the second interior area and communicating with at least one liquid passage in the first interior area, a first generally rigid wall that overlies the first interior area and externally seals the liquid passages, and a second generally flexible wall that overlies the second interior area and externally seals the valve means and the sensing chamber, the second wall flexing in response to external forces applied to control fluid passage through the valve means, the second wall also flexing to transmit information regarding liquid pressure present within the at least one liquid passage to an external sensing element.
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6. A blood processing assembly comprising
a separation element for separating blood from a source into a first component and a second component, a first fluid path for conveying blood from the source to the separation element, a second fluid path for conveying the first component from the separation element, a third fluid path for conveying the second component from the separation element, the first, second, and third fluid paths including, respectively, first, second, and third flow cassettes, each 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 pumping element, a liquid port on the housing attachable to a length of tubing that extends outside the housing interior and forms a part of the associated fluid path, liquid passages formed within the housing interior and communicating with the liquid port, the first pump port, and the second pump port, and valve means formed within the housing interior responsive to the application of external force for controlling liquid flow through the liquid passages and, thus, through the associated fluid path.
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11. A blood processing system comprising
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, a liquid conveying port on the housing, 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 first generally rigid wall that overlies the first interior area and externally seals the liquid paths, and a second generally flexible wall that overlies the second interior area and externally seals the valve means, the second wall flexing in response to external forces applied to control fluid passage through the valve means, a processing apparatus including an operating station for the cassette that comprises a gripping element for engaging the generally rigid cassette wall to hold the cassette in a desired orientation on the station, a peristaltic pumping element arranged with respect to the gripping element to engage the flexible tubing loop when the cassette is in the desired orientation on the station to pump fluid through the liquid passages, and a valve actuating element arranged with respect to the pumping element to register with the cassette valve means and apply external force to the generally flexible cassette wall when the cassette is in the desired orientation on the station to control liquid flow in the cassette passages.
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16. A blood processing assembly comprising
a separation element for separating blood from a source into components, and a fluid path for conveying blood between the source and the separation element, the fluid path including an in-line 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 pumping element, a liquid conveying port on the housing, 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 first generally rigid wall that overlies the first interior area and externally seals the liquid paths, and a second generally flexible wall that overlies the second interior area and externally seals the valve means, the second wall flexing in response to external forces applied to control fluid passage through the valve means.
Specification