Air-in-line and pressure detection
First Claim
1. A method of determining pressure of a sample fluid comprising:
- connecting the sample fluid to a chamber, wherein the chamber has an inlet valve, an outlet valve, and an assembly connected to a pressure source which pumps a chamber fluid out of the chamber, and wherein the sample fluid is connected to the chamber fluid through the outlet valve; and
determining chamber pressure when the pressure of the sample fluid equals the chamber pressure.
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Accused Products
Abstract
Methods and apparatus for air content and pressure measurement of sample fluid, especially sample fluid in association with an infusion pump. Volume change in a chamber as the chamber transitions between negative and positive pressure relates to the air content in the chamber. In particular, in an infusion pump, the volume change of infusion fluid as it transitions between being under negative pressure and positive pressure within a cassette central chamber, e.g., pumping chamber, relates to the air content in the infusion fluid. The outlet pressure of the cassette central chamber, e.g., blood pressure, can be monitored based on the cassette central chamber pressure.
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Citations
38 Claims
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1. A method of determining pressure of a sample fluid comprising:
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connecting the sample fluid to a chamber, wherein the chamber has an inlet valve, an outlet valve, and an assembly connected to a pressure source which pumps a chamber fluid out of the chamber, and wherein the sample fluid is connected to the chamber fluid through the outlet valve; and determining chamber pressure when the pressure of the sample fluid equals the chamber pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for monitoring pressure of a sample fluid comprising:
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a central chamber with an inlet valve and an outlet valve, wherein a sample fluid is connected to a chamber fluid in the central chamber through the outlet valve. an assembly moving in and out of the central chamber; a pressure source connected to the assembly, and wherein the pressure source comprises a motor which generates a negative pressure in the central chamber and pumps fluid into the central chamber via the assembly, and a spring which generates a positive pressure in the central chamber and pumps fluid out of the central chamber via the assembly; a position sensor connected to the assembly, wherein the position sensor determines a position change of the assembly; and a processor connected to the position sensor, wherein the processor receives the position change of the assembly and calculates pressure of the central chamber when the pressure of the sample fluid equals the pressure of the central chamber. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of determining pressure of a sample fluid comprising:
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connecting the sample fluid to a chamber, wherein the chamber has an inlet valve, an outlet valve, and an assembly connected to a pressure source which assembly is operable to pump a chamber fluid out of the chamber, and wherein the sample fluid is connected to the chamber fluid through the outlet valve; operating the assembly to pump chamber fluid out of the chamber through the outlet valve until the chamber pressure equals the pressure of the sample fluid; and determining chamber pressure when the pressure of the sample fluid equals the chamber pressure. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification