Cassette for differential pressure based medication delivery flow sensor assembly for medication delivery monitoring and method of making the same
First Claim
1. A differential pressure based flow sensor assembly to determine the flow rate of a fluid system comprising:
- a disposable portion having;
a body defining a fluid flow passage forming an inlet and an outlet, the body having a base portion and a lid portion;
a flexible fluid pressure membrane disposed along the fluid flow passage between the inlet and the outlet, the fluid pressure membrane being secured between the base portion and the lid portion of the body; and
a flow restricting element positioned in the fluid flow passage between the inlet and the outlet;
wherein lid portion has a first opening and a second opening, and the fluid pressure membrane has a first area and a second area adapted to be aligned with the first opening and the second opening respectively of the lid portion;
wherein the fluid pressure membrane defines an opening between the first area and the second area for receiving the flow restricting element; and
a reusable portion having;
an upstream fluid pressure sensor disposed outside the fluid flow passage and adapted to be pressed upon by the first area of the fluid pressure membrane through the first opening of the lid portion in order to sense an upstream fluid pressure at an upstream location in the fluid flow passage between the inlet and the flow restricting element; and
a downstream fluid pressure sensor disposed outside the fluid flow passage and adapted to be pressed upon by the second area of the fluid pressure membrane through the second opening of the lid portion in order to sense a downstream fluid pressure at a downstream location in the fluid flow passage between the flow restricting element and the outlet.
3 Assignments
0 Petitions
Accused Products
Abstract
A disposable assembly for use with a sensor assembly, and method for making the same, the disposable comprises a body, a flow restricting element, and a fluid pressure membrane. The body has a lid portion and a base portion. The body defines a fluid flow passage that forms an inlet and an outlet. The flow restricting element is positioned along the fluid flow passage between the inlet and the outlet. The fluid pressure membrane is at a location in the fluid flow passage between the inlet and the outlet. The fluid pressure membrane defines an opening for receiving the flow restricting element. The fluid pressure membrane is located between the lid portion and the base portion of the body.
130 Citations
29 Claims
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1. A differential pressure based flow sensor assembly to determine the flow rate of a fluid system comprising:
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a disposable portion having; a body defining a fluid flow passage forming an inlet and an outlet, the body having a base portion and a lid portion; a flexible fluid pressure membrane disposed along the fluid flow passage between the inlet and the outlet, the fluid pressure membrane being secured between the base portion and the lid portion of the body; and a flow restricting element positioned in the fluid flow passage between the inlet and the outlet; wherein lid portion has a first opening and a second opening, and the fluid pressure membrane has a first area and a second area adapted to be aligned with the first opening and the second opening respectively of the lid portion; wherein the fluid pressure membrane defines an opening between the first area and the second area for receiving the flow restricting element; and a reusable portion having; an upstream fluid pressure sensor disposed outside the fluid flow passage and adapted to be pressed upon by the first area of the fluid pressure membrane through the first opening of the lid portion in order to sense an upstream fluid pressure at an upstream location in the fluid flow passage between the inlet and the flow restricting element; and a downstream fluid pressure sensor disposed outside the fluid flow passage and adapted to be pressed upon by the second area of the fluid pressure membrane through the second opening of the lid portion in order to sense a downstream fluid pressure at a downstream location in the fluid flow passage between the flow restricting element and the outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A disposable assembly for use with a differential pressure based fluid flow sensor assembly, the disposable assembly comprising:
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a body having a lid portion secured to a base portion, the body defining a fluid flow passage forming an inlet and an outlet, the lid portion having a first opening and a second opening; a flow restricting element positioned in the fluid flow passage between the inlet and the outlet; and a flexible fluid pressure membrane disposed along the fluid flow passage between the inlet and the outlet and secured between the base portion and the lid portion of the body, the fluid pressure membrane defining an opening for receiving the flow restricting element, the opening for receiving the flow restricting element being located between a first area of the membrane that is aligned with the first opening of the lid portion and a second area of the membrane that is aligned with the second opening of the lid portion. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of forming a disposable flow sensor assembly comprising the steps of:
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providing a base portion, a lid portion, a flow restricting element and a flexible fluid pressure membrane; forming an opening in the fluid pressure membrane for receiving the flow restricting element; inserting the flow restricting element into the opening; positioning the fluid pressure membrane and the flow restricting element between the base portion and the lid portion; and securing the lid portion to the base portion. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification