MEDICAL FLUID PUMP SYSTEMS AND RELATED COMPONENTS AND METHODS
First Claim
Patent Images
1. A medical fluid pump system, comprising:
- a movable piston head;
a cassette comprisinga base defining an opening; and
a membrane attached to the base covering the opening, the membrane together with the base defining a fluid pump chamber, a flow pathway that leads from the fluid pump chamber to an inlet of the cassette, and a flow pathway that leads from the fluid pump chamber to an outlet of the cassette, the cassette positioned so that the membrane faces the piston head and can be moved by the piston head to change a volume of the fluid pump chamber; and
an adhesive disposed between and in contact with the piston head and the membrane, wherein the adhesive has sufficient affinity for the piston head to allow the piston head to retract and deflect the membrane outward to increase the volume of the fluid pump chamber while maintaining adhesive contact with the membrane, and the adhesive has substantially greater affinity for the membrane than for the piston head such that the piston head can be retracted in a manner to separate the piston head from the adhesive without separating the adhesive from the membrane.
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Abstract
A medical fluid delivery cassette configured for use with a medical fluid pumping system. The cassette includes a base, a membrane attached to the base, and an adhesive disposed on a portion of the membrane overlying a fluid pump chamber of the cassette. The portion of the membrane overlying the fluid pump chamber is moveable such that the volume of the fluid pump chamber can be changed.
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Citations
38 Claims
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1. A medical fluid pump system, comprising:
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a movable piston head; a cassette comprising a base defining an opening; and a membrane attached to the base covering the opening, the membrane together with the base defining a fluid pump chamber, a flow pathway that leads from the fluid pump chamber to an inlet of the cassette, and a flow pathway that leads from the fluid pump chamber to an outlet of the cassette, the cassette positioned so that the membrane faces the piston head and can be moved by the piston head to change a volume of the fluid pump chamber; and an adhesive disposed between and in contact with the piston head and the membrane, wherein the adhesive has sufficient affinity for the piston head to allow the piston head to retract and deflect the membrane outward to increase the volume of the fluid pump chamber while maintaining adhesive contact with the membrane, and the adhesive has substantially greater affinity for the membrane than for the piston head such that the piston head can be retracted in a manner to separate the piston head from the adhesive without separating the adhesive from the membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A medical fluid delivery cassette, comprising:
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a base defining an opening; a membrane attached to the base covering the opening, the membrane together with the base defining a fluid pump chamber, a flow pathway that leads from the fluid pump chamber to an inlet of the cassette, and a flow pathway that leads from the fluid pump chamber to an outlet of the cassette, and a portion of the membrane overlying the fluid pump chamber being moveable relative to the base such that the volume of the fluid pump chamber can be changed by applying a force to the portion of the membrane overlying the fluid pump chamber; an adhesive coating on an outside surface of the portion of the membrane overlying the fluid pump chamber; and a release layer substantially covering and releasably attached to the adhesive coating. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A medical fluid delivery method, comprising:
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adhering a first piston head of a medical system to a membrane of a medical fluid delivery cassette by moving the first piston head into contact with adhesive disposed on a portion the membrane overlying a first fluid pump chamber; and with the first piston head adhered to the membrane, changing a volume of the first fluid pump chamber by flexing the portion of the membrane overlying the first fluid pump chamber with the first piston head. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification