Ventilator respiratory gas accumulator with dip tube

• US 8,434,481 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: Ogilvie, Mark, Vuong, Steve
• Primary Examiner(s): STIGELL, THEODORE J
• Application Number:
  US12/729,293
• Publication Number:
  US 20110132364A1
• Time in Patent Office: 1,141 Days
• Field of Search: 128/204.18, 12820421-20422, 128/205.24, 128/207.14, 128/207.16
• US Class Current: 128/204.21
• 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 systems and methods for ventilating a patient with a system that includes an accumulator located away from the flow path that reduces or eliminates pockets or burps of an undesirable gas mixture from entering the gas flow path and reaching the patient after a gas mixture change. The disclosure also describes a novel approach for reducing or eliminating these air pockets of undesirable gas by utilizing a dip-tube.

Claims

1. A medical ventilator system, comprising:

a processor;

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

a gas manifold connected to a patient circuit via a flow path, the gas manifold receiving gas from the plurality of gas sources to form a gas mixture;

a T-connector, wherein the flow path goes through a top of the T-connector; and

an accumulator connected to the flow path solely by a dip-tube, wherein the dip-tube has a first end within the accumulator and a second end connected to a stem of the T-connector and wherein the distance between the first end and the second end is a length selected to reduce undesirable pockets of the gas mixture contained in the accumulator from entering the outlet to the patient circuit, wherein the length is selected from a range of 2 inches to 20 inches.

2. The medical ventilator system of claim 1, further comprising an accumulator purge valve controlled by the processor, the accumulator purge valve controlling a release of a gas mixture from the accumulator to an environment external to the patient circuit.

3. The medical ventilator system of claim 2, wherein the processor is adapted to control the purge valve based on at least one of a sensor reading, a change in a gas mixture delivered to a patient, a ventilator parameter, and an inputted command.

4. The medical ventilator system of claim 2, wherein the purge valve is a check valve.

5. The medical ventilator system of claim 2, wherein the dip-tube has a volume of 95 ml to 115 ml.

6. The medical ventilator system of claim 1, wherein the accumulator is positioned within the ventilator system adjacent to the flow path and the manifold.

7. The medical ventilator system of claim 1, wherein the dip-tube is internal to the accumulator.

8. The medical ventilator system of claim 1, further comprising a display controlled by the processor, the display is adapted to display at least one of purge pressure and an accumulator purge interval.

9. The medical ventilator system of claim 1, further comprising an accumulator pressure sensor is in communication with the processor, the pressure sensor is adapted to determine the pressure in the accumulator.

10. The medical ventilator system of claim 1, further comprising a gas flow sensor in communication with the processor, the flow sensor is adapted to determine a flow rate in the patient circuit.

11. 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; and

a ventilation system including a patient circuit for connecting the pressure generating system to a patient,

wherein the pressure generating system includes;

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

a gas manifold connected to the patient circuit via a flow path, the gas manifold receiving gas from the plurality of gas sources; and

an accumulator connected to the flow path solely by a dip-tube, wherein the dip-tube has a first end within the accumulator and a second end connected to the flow path and wherein the distance between the first end and the second end is a length selected to reduce undesirable pockets of the gas mixture contained in the accumulator from entering the outlet to the patient circuit, wherein the length is selected from a range of 2 inches to 20 inches.

12. The pressure support system of claim 11, further comprising an accumulator purge valve controlled by the processor, the accumulator purge valve controlling the release of a gas mixture from the accumulator to an environment external to the patient circuit.

13. The pressure support system of claim 12, wherein the processor is adapted to control the purge valve based on at least one of a sensor reading, a change in a gas mixture delivered to a patient, a ventilator parameter, an inputted parameter, and a command.

14. The pressure support system of claim 11, wherein the dip-tube has a diameter of 0.3 inches to 1 inches.

15. The pressure support system of claim 11, wherein the accumulator is positioned in the ventilator system adjacent to the flow path and the manifold.

16. The pressure support system of claim 11, wherein the dip-tube is internal to the accumulator.

17. The pressure support system of claim 11, further comprising an accumulator pressure sensor in communication with the processor, the accumulator pressure sensor is adapted to determine the pressure of the accumulator.

18. The pressure support system of claim 11, further comprising a gas flow sensor in communication with the processor, the flow sensor is adapted to determine a flow rate in the patient circuit.