Ventilator Respiratory Variable-Sized Gas Accumulator

• US 8,434,484 B2
• Filed: 03/23/2010
• Issued: 05/07/2013
• Est. Priority Date: 12/03/2009
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Patel, Nirav
• Primary Examiner(s): STIGELL, THEODORE J
• Application Number:
  US12/729,303
• Publication Number:
  US 20110132367A1
• Time in Patent Office: 1,141 Days
• Field of Search: 128/204.18, 12820421-20422, 128/205.24, 128/207.14, 128/207.16, 128/203.12
• 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 further describes a novel approach for a fast delivery of a change in gas mixture to a patient by utilizing a variable-sized accumulator.

Claims

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

controlling a change in gas mixture;

measuring a gas flow rate in a patient circuit;

measuring a pressure in a first chamber of an accumulator system with a plurality of chambers;

closing a first valve to close a flow connection between the first chamber and a second chamber of the accumulator system to reduce a volume of the accumulator system;

controlling a release of a second gas mixture from the second chamber of the accumulator system to an environment external to the patient circuit by controlling a first purge valve in the second chamber of the accumulator system; and

controlling a pressure of the accumulator system by controlling the gas flow rate,

wherein the pressure and the volume of the accumulator system are controlled based on at least one of the change in gas mixture, the measured gas flow rate, and the measured pressure of the accumulator system during ventilation of a patient.

2. The method of claim 1, further comprising, controlling a breath type, wherein the pressure and the volume of the accumulator system are controlled based on the at least one of the change in gas mixture, the measured gas flow rate, and the measured pressure of the accumulator system and the controlled breath type.

3. The method of claim 1, wherein the step of controlling the pressure of the accumulator system includes maintaining the pressure of the gas mixture in the accumulator system from 14 PSIG to 9 PSIG during a change in volume of the accumulator system.

4. The method of claim 1, further comprising opening the first valve to open the flow connection between the first chamber and the second chamber of the accumulator system to increase the volume of the accumulator system.

5. The method of claim 4, further comprising opening a second valve to open a second flow connection between the second chamber and a third chamber of the accumulator system to increase the volume of the accumulator system.

6. The method of claim 1, wherein the volume of the accumulator system ranges from about 100 ml to about 500 ml.

7. The method of claim 1, further comprising displaying at least one of the volume and the pressure of the accumulator system.