| 主权项 |
1. A cassette for engagement with an infusion pump for delivery of a fluid to a subject comprising
a flexible tubing through which the fluid flows and a housing comprising opposing flat outside walls respectively defining first and second ends for holding the flexible tubing, and the housing at least partially defining a flow path along which the flexible tubing is tensioned for fluid flow therein, the housing comprising another outside wall between the opposing outside walls and having two straight wall sections and a fixed, rigid curved wall located between the two straight wall sections, the fixed, rigid curved wall section having an opening between each side of the fixed, rigid curved wall and the adjacent straight wall section through which the flexible tubing passes, and the flexible tubing is configured for engaging a pumping mechanism of the infusion pump that moves the fluid through the flexible tubing, a length of the flexible tubing is initially held between the ends of the cassette in a straight line, but, when the cassette is engaged with the pumping mechanism of the pump, the length of the flexible tubing is accurately and repeatably tensioned and positioned in the flow path with the pumping mechanism stretching the flexible tubing to repeatably tension the flexible tubing to allow correct fluid flow therethrough, and the opposing flat outside walls of the first and second ends each comprising an inlet or outlet tubing support in the form of an adaptor molded therein for fixing the flexible tubing therebetween; further comprising: an anti-flow valve mechanism that is initially biased against the flexible tubing in a fluid non-delivery position to prevent flow therethrough; a member operatively associated with the cassette and the anti-flow valve mechanism to overcome a force-applying member bias to allow the flow of fluid through the flexible tubing when the housing is engaged with the infusion pump; and the housing is configured and dimensioned for engagement with the infusion pump,
wherein during or after engagement, the member assumes a fluid delivery position to allow the flow of the fluid through the flexible tubing, while before or as the cassette is removed from the infusion pump, the member assumes the fluid non-delivery position to prevent the flow of fluid through the flexible tubing,wherein the anti-flow valve mechanism is located at a position selected from the group consisting of 1) associated with the tubing, cassette or housing, and 2) situated in or near the cassette or housing, andwherein the anti-flow valve mechanism comprises a moveable member and a force applying member, the force applying member in the fluid non-delivery position biases the moveable member against the flexible tubing to prevent flow therethrough, and the moveable member is moveable between the fluid non-delivery position and the fluid delivery position where the force applying member bias is removed to allow fluid flow through the flexible tubing, wherein the moveable member is linearly moveable along a direction substantially perpendicular to the longitudinal axis of the flexible tubing. |
