A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/91
A61M 5/14 (2006.01) A61M 5/168 (2006.01)
Patent
CA 1153262
D-1194a APPARATUS FOR CONTROLLING THE FLOW OF INTRAVENOUS FLUID TO A PATIENT Abstract of the Disclosure Apparatus is included in a system for controlling the flow of intravenous fluid from a source to a patient. Such apparatus is manually adjustable to vary the rate of such fluid flow. Desired rates of fluid flow may also be set in such system when the apparatus is included in the system. The system then overrides any previous manual adjustment of such apparatus and adjusts the rate of fluid flow in accordance with any such setting. When a desired rate of fluid flow has been preset into the system, the system then operates to adjust the rate of fluid flow in an instantaneous basis so that the desired rate of fluid flow is maintained. The apparatus is removably disposed in the system for controlling the flow of fluid to the patient. Even after the adjustment by the system of the rate of fluid flow in accordance with any setting, the apparatus may be removed from the system to provide a rate of fluid flow in accordance with the manual adjustment of the apparatus. A plug member in the apparatus defines a passage communicating at a first position with an inlet line and, at a displaced position in a particular direction, with an outlet line. A resilient member such as a diaphragm may be disposed in the particular direction in the passage and may be displaced in a transverse direction from the inlet and outlet lines. A rod constrains the diaphragm in the transverse direction. A button may serve as a baffle against the flow of fluid between the inlet and outlet lines to cooperate with the diaphragm in limiting the rate of flow of fluid through the passage. A knob may be adjustably threaded on the plug member to press the rod against the diaphragm with a force dependent upon the adjustments of the knob. A particular one of the button, the diaphragm or the rod may be provided with a channel to facilitate the flow of fluid from the inlet line past the barrier to the outlet line. In a preferred embodiment, the button may have a channel or channels cooperating with the diaphragm in facilitating the flow of fluid through the passage between the inlet and outlet lines at the desired rate. Specifically, the button may be disposed laterally across the passage at a position between the inlet and outlet lines and may be provided with a plurality of channels each having a different cross-sectional area than the other channels. In other embodiments, the channel may be provided in the diaphragm or the rod.
372896
Borden Ladner Gervais Llp
Imed Corporation
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