PROCESS FOR OPERATING A RESPIRATOR AND/OR ANESTHESIA DEVICE IN THE APRV MODE WITH THE %PEF CRITERION AND A DEVICE OPERATED CORRESPONDINGLY

• US 20080295840A1
• Filed: 06/02/2008
• Published: 12/04/2008
• Est. Priority Date: 06/04/2007
• Status: Active Grant

• Current Assignee: Dragerwerk AG & Company KGaA (FPS Vermögensverwaltung GmbH)
• Original Assignee: Drager Medical AG & Co KG (Dragerwerk AG)
• Inventors: GLAW, Tobias
• Granted Patent: US 8,695,597 B2
• Time in Patent Office: Days
• US Class Current: 128/204.23
• CPC Class Codes: A61B 5/0871 Peak expiratory flowmeters
• CPC Class Codes: A61M 16/01 specially adapted for anaesthetising A61M16/104, A61M16/18 take precedence
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase

Abstract

A process for operating a respirator and/or anesthesia device in the APRV mode with the % PEF criterion which includes a detection of a spontaneous expiratory effort by the patient and initiation of a pressure release phase when the detected spontaneous expiratory effort by the patient falls within a predetermined trigger window (Tf_reg). A device is provided that is operated correspondingly.

Claims

1. A process for operating a respirator and/or anesthesia device in Airway Pressure Release Ventilation (APRV) mode with a % Peak Expiratory Flow (PEF) criterion, the process comprising the steps of:

detecting a spontaneous expiratory effort by a patient;

initializing a pressure release phase when the detected spontaneous expiratory effort by the patient falls within a predetermined trigger window.

2. A process in accordance with claim 1, further comprising the step of:

fixing said trigger window.

3. A process in accordance with claim 1, wherein said step of initializing a pressure release phase occurs when a patient flow within said trigger window is smaller than a predetermined value or when the spontaneous expiratory effort is detected.

4. A process in accordance with claim 1, further comprising the step of:

prolonging an inspiration time of a respiration cycle beyond a preset inspiration time by a duration by which said trigger window was shortened in a preceding inspiration phase because of said pressure release phase occurring before the end of that trigger window.

5. A process in accordance with claim 4, further comprising the step of:

shifting a start of said trigger window to a point in time after the end of a minimum inspiration time and after an end of said duration.

6. A respirator and/or anesthesia device for respirating a patient in Airway Pressure Release Ventilation (APRV) mode with a % Peak Expiratory Flow (PEF) criterion, the device comprising:

a detection means for detecting a spontaneous expiratory effort by a patient; and

a determination means for determining whether the spontaneous expiratory effort falls within a predetermined trigger window.

7. A device in accordance with claim 6, further comprising a trigger window fixing means for fixing said trigger window within an inspiration time.

8. A device in accordance with claim 6, further comprising an initiation means for initiating a pressure release phase when a patient flow in said trigger window is smaller than a predetermined value or when a spontaneous expiratory effort is recognized.

9. A device in accordance with claim 7, further comprising a means for extending the inspiration time of a respiration cycle beyond a predetermined inspiration time by a duration by which a pressure release phase in a preceding inspiration phase occurred in said trigger window before the end of that trigger window.

10. A device in accordance with claim 9, further comprising a means for shifting a start of a trigger window to a point in time after an end of a minimum inspiration time and after the end of said duration.

11. A process for operating a respirator and/or anesthesia device the process comprising the steps of:

providing respiration of a patient in Airway Pressure Release Ventilation (APRV) mode with an airway pressure varied between an upper pressure level and a lower pressure level with a transition from upper pressure level and a lower pressure level comprising a pressure release phase;

terminating the pressure release phase with a return to the upper pressure level when an instantaneous patient expiratory flow relative to a maximum expiration flow has dropped below a set percentage;

detecting a spontaneous expiratory effort by a patient;

initializing the pressure release phase when the detected spontaneous expiratory effort by the patient falls within a predetermined trigger window or otherwise initializing the pressure release phase at the end of said predetermined trigger window.

12. A process in accordance with claim 11, further comprising the step of:

fixing said trigger window.

13. A process in accordance with claim 11, wherein said step of initializing the pressure release phase occurs when a patient flow within said trigger window is smaller than a predetermined value or when the spontaneous expiratory effort is detected.

14. A process in accordance with claim 11, further comprising the step of:

prolonging an inspiration time of a respiration cycle beyond a preset inspiration time by a duration by which said trigger window was shortened in a preceding inspiration phase because of said pressure release phase occurring before the end of that trigger window.

15. A process in accordance with claim 14, further comprising the step of:

shifting a start of said trigger window to a point in time after the end of a minimum inspiration time and after an end of said duration.