Cassette for differential pressure based medication delivery flow sensor assembly for medication delivery monitoring and method of making the same
First Claim
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1. A disposable assembly for releasable coupling engagement with a reusable flow sensor assembly, the disposable assembly comprising:
- a body having a lid portion and a base portion, the body defining a fluid flow passage and forming an inlet and an outlet, the lid portion having a first opening and a second opening and being secured to the base portion;
a flow restricting element extending completely across the fluid flow passage at a location between the inlet and the outlet and between the first opening and the second opening, the flow restricting element having an orifice formed therethrough and being positioned in the base portion;
a fluid pressure membrane disposed along the fluid flow passage between the inlet and the outlet, the fluid pressure membrane being captured between the lid portion and the base portion of the body and defining a fluid pressure responsive movable wall having an external surface remote from the fluid flow passage, the external surface being accessible through the first opening and the second opening of the lid portion for releasable coupling engagement with the reusable flow sensor assembly.
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Abstract
A disposable assembly for use with a sensor assembly, the disposable comprising 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 in the fluid flow passage between the inlet and the outlet. The fluid pressure membrane is disposed along the fluid flow passage between the inlet and the outlet. The fluid pressure membrane is located between the lid portion and the base portion of the body.
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Citations
15 Claims
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1. A disposable assembly for releasable coupling engagement with a reusable flow sensor assembly, the disposable assembly comprising:
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a body having a lid portion and a base portion, the body defining a fluid flow passage and forming an inlet and an outlet, the lid portion having a first opening and a second opening and being secured to the base portion; a flow restricting element extending completely across the fluid flow passage at a location between the inlet and the outlet and between the first opening and the second opening, the flow restricting element having an orifice formed therethrough and being positioned in the base portion; a fluid pressure membrane disposed along the fluid flow passage between the inlet and the outlet, the fluid pressure membrane being captured between the lid portion and the base portion of the body and defining a fluid pressure responsive movable wall having an external surface remote from the fluid flow passage, the external surface being accessible through the first opening and the second opening of the lid portion for releasable coupling engagement with the reusable flow sensor assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14, 15)
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10. A method of forming a disposable portion for releasable coupling engagement with a reusable fluid flow sensor assembly comprising:
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providing a preformed flow restricting element having an orifice formed therethrough; forming a base portion around the flow restricting element using a mold and an injection molding process, the base portion forming at least a portion of a fluid flow passage having an inlet and an outlet, the inlet being in fluid communication with an upstream side of the flow restricting element and the outlet being in fluid communication with a downstream side of the flow restricting element; positioning a fluid pressure membrane along the fluid flow passage between the inlet and the outlet, the fluid pressure membrane contacting the base portion and defining a fluid pressure responsive movable wall having an external surface remote from the fluid flow passage; and securing a lid portion to the base portion, the lid portion having a first opening on the upstream side of the flow restricting element and a second opening on the downstream side of the flow restricting element, the fluid pressure membrane being positioned between the lid portion and the base portion following the securing step such that the external surface is accessible through the first opening and the second opening for releasable coupling engagement with the reusable fluid flow sensor assembly. - View Dependent Claims (11, 12, 13)
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Specification