Systems And Methods For Automatic Adjustment Of Ventilator Settings

• US 20120247471A1
• Filed: 03/30/2011
• Published: 10/04/2012
• Est. Priority Date: 03/30/2011
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Inventors: Masic, Milenko, Doyle, Peter
• Granted Patent: US 8,714,154 B2
• Time in Patent Office: Days
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/026 specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 2230/46 Resistance or compliance of the lungs

Abstract

Various embodiments of the present disclosure provide systems, methods and devices for respiratory support. As one example, a ventilation system is disclosed that includes a computer readable medium including instructions for operating in a hybrid mode. These instructions include measuring patient effort during a spontaneous breath type and deriving a neural inspiratory time from the measurements of patient effort. This neural inspiratory time is then set as the inspiratory for a breath of a mandatory breath type. If new patient effort measurements are received by the ventilator, the neural inspiratory time may be adjusted.

Claims

1. A ventilation system, comprising:

a processor communicably coupled to a computer readable medium, wherein the computer readable medium includes instructions for delivering a mandatory breath type that when executed cause the processor to;

measure patient effort for a first breath;

calculate a neural inspiratory time based on at least the measured patient effort for the first breath;

set the neural inspiratory time as the inspiratory time for a second breath, the second breath being of a mandatory breath type.

2. The system of claim 1, wherein the mandatory breath type comprises:

volume control, volume control plus, pressure control, and any time-cycled breath type.

3. The system of claim 1, wherein the neural inspiratory time is calculated on a breath by breath basis.

4. The system of claim 1, wherein the neural inspiratory time is calculated on an interval basis.

5. The system of claim 1, wherein the second breath is the next breath after the first breath.

6. The system of claim 1, wherein the instructions further cause the processor to:

measure patient effort for the second breath;

calculate a new neural inspiratory time based on the measured patient effort from at least the first breath and the second breath;

set the new neural inspiratory time as inspiratory time for a breath, the third breath being of the mandatory breath type.

7. A method for respiratory support, the method comprising:

measure patient effort for a first breath;

calculate a neural inspiratory time based on at least the measured patient effort for the first breath;

set the neural inspiratory time as the inspiratory time for a second breath, the second breath being of a mandatory breath type.

8. The method of claim 7, wherein the mandatory breath type comprises:

volume control, volume control plus, and pressure control and any time-cycled breath.

9. The method of claim 7, wherein the neural inspiratory time is calculated on a breath by breath basis.

10. The method of claim 7, wherein the neural inspiratory time is calculated on an interval basis.

11. The method of claim 7, wherein the second breath is the next breath after the first breath.

12. The method of claim 7, wherein the instructions further cause the processor to:

measure patient effort for the second breath;

calculate a new neural inspiratory time based on the measured patient effort from at least the first breath and the second breath;

set the new neural inspiratory time as inspiratory time for a third breath, the second breath being of the mandatory breath type.

13. A ventilation system, the ventilation system comprising:

a gas inlet;

a gas outlet;

a tube coupling the gas inlet to the gas outlet;

a pressure sensor, wherein the pressure sensor is operable to provide a measured pressure value indicating a pressure in the tube;

a first flow sensor, wherein the first flow sensor is operable to provide an inlet flow value indicating a flow associated with the gas inlet;

a second flow sensor, wherein the second flow sensor is operable to provide an outlet flow value indicating a flow associated with the gas outlet;

a graphical display; and

a processor communicably coupled to a computer readable medium, wherein the computer readable medium includes instructions for delivering a mandatory breath type, that when executed cause the processor to;

measure patient effort for a first breath;

derive a duration of inspiration for the first breath from the patient effort;

calculate a neural inspiratory time based on at least the duration of inspiration for the first breath;

set the neural inspiratory time as the inspiratory time for a second breath, the second breath being of a mandatory breath type.

14. The system of claim 13, wherein the mandatory breath type comprises:

volume control, volume control plus, and pressure control.

15. The system of claim 13, wherein the neural inspiratory time is calculated on a breath by breath basis.

16. The system of claim 13, wherein the neural inspiratory time is calculated on an interval basis.

17. The system of claim 13, wherein the second breath is the next breath after the first breath.

18. The system of claim 13, wherein the instructions further cause the processor to:

measure patient effort for the second breath;

derive a duration of inspiration for the second breath from the patient effort;

calculate a new neural inspiratory time based on the duration of inspiration for at least the first breath and the second breath;

set the new neural inspiratory time as inspiratory time for a third breath, the third breath being of the mandatory breath type.

19. The system of claim 16, wherein calculating the neural inspiratory time on an interval basis further comprises

accessing the duration of inspiration for a preset number of breaths including the first breath;

and

averaging the durations of inspiration for the preset number of breaths;

setting the averaged duration of inspiration as the neural inspiratory time.

20. The system of claim 16, wherein calculating the neural inspiratory time on an interval basis further comprises

accessing the duration of inspiration for a series of breaths taken during a preset time period, the series of breaths including the first breath;

and

averaging the durations of inspiration for the series of breaths;

setting the averaged duration of inspiration as the neural inspiratory time.