| 摘要 |
A variable volume bottle (12), and related system are provided for infusing a selected medical fluid (14) to a patient. The variable volume bottle compris es a relatively rigid bottle body (30) having a lower neck (32) adapted for connection to an infusion line by a cap fitting (42) having a slotted nipple (46) for controlled flow of the medical fluid from the bottle, and through t he infusion line to the patient. The bottle body further includes a movable upp er wall (38) which descends as the fluid is delivered to the patient, and a flo w sensor unit (20) tracks displacement of the movable upper wall to provide an indication of the dispensed fluid volume. A flow rate controller (18) may be provided for constricting the slotted nipple to variably adjust the open are a defined by the slot therein, and thereby variably select the rate of fluid flow to the patient. In an alternative embodiment, the cap fitting may comprise a pair of inter-fitting cap members having a pair of overlapping fl ow ports formed therein, wherein the cap members are movably positioned with respect to each other to adjust the open area of an outlet passage defined b y the flow ports, and thereby variably select the rate of fluid flow to the patient.
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