Methods And Systems For Transitory Ventilation Support

• US 20120216810A1
• Filed: 02/27/2011
• Published: 08/30/2012
• Est. Priority Date: 02/27/2011
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Inventors: Jafari, Mehdi M., Doyle, Peter R., Jimenez, Rhomere S., Aviano, Jeffrey K.
• Granted Patent: US 8,783,250 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 16/0063 Compressors
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/0833 T- or Y-type connectors, e.g. Y-piece
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• 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
• CPC Class Codes: A61M 2230/60 Muscle strain, i.e. measured on the user

Abstract

This disclosure describes systems and methods for providing a transitory ventilation support breath type during ventilation of a patient. The disclosure describes a novel breath type that provides for a beneficial transition between an assist breath type and an effort-based breath type and/or a breath type that is beneficial for weak patients.

Claims

1. A method for ventilating a patient with a ventilator comprising:

setting a control pressure;

detecting a patient initiated trigger for a breath;

repeatedly measuring inspiration flows by the patient during delivery of the control pressure starting from the detection of the patient initiated trigger;

calculating target pressures based on each of the measured inspiration flows during the delivery of the control pressure;

repeatedly comparing each calculated target pressure to the control pressure during the delivery of the control pressure;

delivering the control pressure during inhalation for a predetermined amount of time unless at least one of the calculated target pressures is greater than the control pressure; and

delivering a current calculated target pressure during inhalation if the at least one of the calculated target pressures is greater than the control pressure.

2. The method of claim 1, wherein the calculated target pressures are based on a proportional-assist (PA) breath type.

3. The method of claim 1, wherein the step of repeatedly measuring the inspiration flows of the patient repeats every 5 milliseconds for the duration of the delivery of the control pressure.

4. The method of claim 1, further comprising executing alarm settings based on a volume-control breath (VC) type when the control pressure is delivered to patient.

5. The method of claim 1, further comprising executing alarm settings based on a pressure-control breath (PC) type when the control pressure is delivered to patient.

6. The method of claim 1, further comprising executing alarm settings based on a proportional-assist (PA) breath type when the calculated target pressure is delivered to patient.

7. The method of claim 1, wherein the control pressure exceeds a minimum error sensitivity threshold.

8. The method of claim 1, wherein the control pressure is set by receiving input from an operator via a user interface.

9. The method of claim 1, wherein the predetermined amount of time is set by the operator.

10. The method of claim 1, wherein the predetermined amount of time is set by the ventilator based on a patient parameter.

11. The method of claim 10, wherein the patient parameter is ideal body weight.

12. The method of claim 1, wherein the at least one of the calculated target pressures is a predetermined pattern of calculated target pressures.

13. The method of claim 12, wherein the predetermined pattern of calculated target pressures is two or more consecutive calculated target pressures measuring more than a predetermined level above the control pressure.

14. The method of claim 1, wherein the control pressure is determined by a volume-targeted pressure-controlled algorithm.

15. A ventilator system comprising:

a pressure generating system adapted to generate a flow of breathing gas;

a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient;

one or more sensors operatively coupled to at least one of the pressure generating system, the patient, and the ventilation tubing system, wherein at least one sensor is capable of generating an output indicative of an inspiration flow;

an effort-based ventilation module that calculates at least one target pressure based on at least one measured inspiration flow and causes the pressure generating system to deliver the at least one target pressure to the patient during inhalation; and

a transitory ventilation support module that causes the pressure generating system to deliver a control pressure to the patient after a patient initiated trigger is detected for a predetermined amount of time unless the at least one calculated target pressure is greater than a set control pressure during the predetermined amount of time, then the pressure delivered to the patient is determined by the effort-based ventilation module.

16. The method of claim 15, further comprising a switch for activating and deactivating the transitory ventilation support module.

17. The method of claim 15, wherein the ventilator system automatically utilizes the transitory ventilation support module unless deactivated by the operator.

18. The method of claim 15, wherein the at least one sensor generates output indicative of the inspiration flow every 5 ms during the predetermined amount of time.

19. The method of claim 15, wherein the predetermined amount of time is based on a patient parameter.

20. A computer-readable medium having computer-executable instructions for performing a method for ventilating a patient with a ventilator, the method comprising:

repeatedly detecting a patient initiated trigger for a breath;

repeatedly measuring inspiration flows by the patient during delivery of a control pressure starting from the detection of the patient initiated trigger;

repeatedly calculating target pressures based on each of the measured inspiration flows during the delivery of the control pressure;

repeatedly comparing each calculated target pressure to the control pressure during the delivery of the control pressure;

repeatedly delivering the control pressure during inhalation for a predetermined amount of time unless at least one of the calculated target pressures is greater than the control pressure; and

repeatedly delivering a current calculated target pressure during inhalation if the at least one of the calculated target pressures is greater than the control pressure.

21. A ventilator system, comprising:

means for setting a control pressure;

means for detecting a patient initiated trigger for a breath;

means for repeatedly measuring inspiration flows by the patient during delivery of the control pressure starting from the detection of the patient initiated trigger;

means for calculating target pressures based on each of the measured inspiration flows during the delivery of the control pressure;

means for repeatedly comparing each calculated target pressure to the control pressure during the delivery of the control pressure;

means for delivering the control pressure during inhalation for a predetermined amount of time unless at least one of the calculated target pressures is greater than the control pressure; and

means for delivering a current calculated target pressure during inhalation if the at least one of the calculated target pressures is greater than the control pressure.