Ventilator Respiratory Gas Accumulator With Sampling Chamber

• US 20110132365A1
• Filed: 03/23/2010
• Published: 06/09/2011
• Est. Priority Date: 12/03/2009
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Inventors: Hyde, David, Sanchez, Gabriel, Patel, Nirav
• Granted Patent: US 8,434,483 B2
• Time in Patent Office: Days
• US Class Current: 128/204.22
• CPC Class Codes: A61M 16/0057 Pumps therefor
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/04 Tracheal tubes catheters in general A61M25/00
• CPC Class Codes: A61M 16/0666 Nasal cannulas or tubing devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02
• CPC Class Codes: A61M 16/085 Gas sampling
• CPC Class Codes: A61M 16/0875 Connecting tubes
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 16/20 Valves specially adapted to medical respiratory devices
• CPC Class Codes: A61M 16/202 electrically actuated
• CPC Class Codes: A61M 16/209 Relief valves
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2202/025 Helium
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards

Abstract

This disclosure describes systems and methods for ventilating a patient with a system that includes an accumulator for storing a gas mixture. The disclosure describes a novel approach for determining the concentrations of gas found in the accumulator by utilizing a sampling chamber. The disclosure further describes a novel approach for a fast delivery of a change in gas mixture to a patient by utilizing a variable-sized accumulator. This disclosure also describes systems and methods for ventilating a patient with a system that includes an accumulator located away from the flow path that reduces/eliminates pockets of an undesirable gas mixture from entering the gas flow path and reaching the patient after a gas mixture change by utilizing at least one of a dip-tube, a purge valve, and a variable size accumulator.

Claims

1. A medical ventilator system, comprising:

a processor;

a plurality of sources of different gases controlled by the processor;

an accumulator adapted to receive the different gasses forming a gas mixture, wherein during ventilation of a patient, the accumulator stores the gas mixture at a first pressure;

a sampling chamber adapted to receive a gas mixture portion from the accumulator at a second pressure less than the first pressure; and

a sensor adapted to measure a concentration of the gas mixture portion received by the sampling chamber.

2. The medical ventilator system of claim 1, wherein the sensor measures the concentration of the gas mixture portion while the gas mixture portion is stored in the sampling chamber.

3. The medical ventilator system of claim 1, further comprising a valve controlled by the processor, the valve is adapted to control a connection between the accumulator and the sampling chamber.

4. The medical ventilator system of claim 3, wherein the processor is adapted to control the valve based on at least one of a sensor reading, a change in a gas mixture, a ventilator parameter, and a command.

5. The medical ventilator system of claim 1, wherein the sampling chamber includes a purge valve controlled by the processor, the purge valve is adapted to release the gas mixture portion received by the sampling chamber.

6. The medical ventilator system of claim 1, wherein the sensor measures the concentration of the gas mixture portion as the gas mixture portion flows through at least one an accumulator purge valve or a sampling chamber purge valve.

7. The medical ventilator system of claim 1, further comprising a display controlled by the processor, the display is adapted to display the sensor reading.

8. The medical ventilator system of claim 1, further comprising

a valve controlled by the processor, the valve is adapted to control a connection between the accumulator and the sampling chamber;

a purge valve within the sampling chamber controlled by the processor, the purge valve is adapted to release the gas mixture portion received by the sampling chamber,

wherein the processor is adapted to control the pressure of the sampling chamber by activating at least one of the valve and the purge valve.

9. A method for ventilating a patient, the method comprising:

controlling when a sample of a gas mixture is received by a sampling chamber from an accumulator;

controlling a volume of the sample received by the sampling chamber from the accumulator;

controlling a pressure of the sample in the sampling chamber, wherein the pressure of the sample in the sampling chamber is less than a pressure of the gas mixture in the accumulator during ventilation of a patient at the same time; and

measuring a gas mixture concentration of the sample received by the sampling chamber.

10. The method of claim 9, further comprising controlling the release of the sample from the sampling chamber.

11. The medical ventilator system of claim 9, wherein the step of measuring the gas mixture concentration of the sample received by the sampling chamber includes measuring the gas mixture concentration of the sample during storage of the sample in the sampling chamber.

12. The medical ventilator system of claim 9, wherein the step of measuring the gas mixture concentration of the sample received by the sampling chamber includes measuring the gas mixture concentration of the sample as the sample flows through at least one of a purge valve of the sampling chamber or a purge of the accumulator.

13. The medical ventilator system of claim 9, wherein the step of controlling when the sample of the gas mixture is received by the sampling chamber from the accumulator, the step of controlling the volume of the sample received by the sampling chamber from the accumulator, and the step of controlling the pressure of the sample in the sampling chamber are controlled based on at least one of a sensor reading, a change in a gas mixture, a ventilator parameter, and a command.

14. A pressure support system comprising:

a processor;

a pressure generating system controlled by the processor, the pressure generating system is adapted to generate a flow of breathing gas;

a ventilation system including a patient circuit controlled by the processor;

a plurality of sources of different gases controlled by the processor;

an accumulator adapted to receive the different gasses forming a gas mixture, wherein during ventilation of a patient, the accumulator stores the gas mixture at a first pressure;

a sampling chamber adapted to receive a gas mixture portion from the accumulator at a second pressure less than the first pressure; and

a sensor adapted to measure a concentration of the gas mixture portion received by the sampling chamber.