Dialysis machine for actuating a method for detecting a liquid level in a container in a circuit
First Claim
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1. A dialysis machine comprising:
- a pump for circulating blood through a circuit comprising a container in which a gas space is created above a liquid level;
a pressure sensor for detecting a pressure in said container; and
a control unit connected to the pump and to the pressure sensor and designed to determine the liquid level in the container from pressure values detected by the pressure sensor before and after a variation induced in at least one of a mass of the gas and a mass of the liquid in the container.
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Abstract
A container of a dialysis machine has a determined shape and a known volume occupied in part by a volume of a mass of blood; a remaining part is occupied by a volume of a mass of gas. A disturbance is induced in a combined mass of the liquid and the gas in the container and an entity of the disturbance is measured. Measurements of pressure in the container before and after the disturbance are taken, the volume of gas is calculated using a function correlated to a gas law, and the volume and level of the liquid in the container are derived after the volume occupied by the gas is calculated.
39 Citations
16 Claims
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1. A dialysis machine comprising:
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a pump for circulating blood through a circuit comprising a container in which a gas space is created above a liquid level; a pressure sensor for detecting a pressure in said container; and a control unit connected to the pump and to the pressure sensor and designed to determine the liquid level in the container from pressure values detected by the pressure sensor before and after a variation induced in at least one of a mass of the gas and a mass of the liquid in the container. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A dialysis machine for actuating a method for determining a liquid level in a container connected to a circuit, the container having a known volume occupied in part by a volume of a liquid and in part by a volume of a gas, the circuit comprising a supply branch taking the liquid to the container and a return branch evacuating the liquid from the container, the method determining the volume of the gas in order to calculate the volume of the liquid and the liquid level in the container, the dialysis machine comprising:
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a pressure sensor for detecting a pressure of the gas in the container; and a peristaltic pump for circulating the liquid through the circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification