Pressure-controlled breathing aid

• US 8,573,206 B2
• Filed: 06/16/2008
• Issued: 11/05/2013
• Est. Priority Date: 09/12/1994
• Status: Expired due to Term

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Bourdon, Guy
• Primary Examiner(s): Dixon, Annette
• Application Number:
  US12/140,095
• Publication Number:
  US 20100024820A1
• Time in Patent Office: 1,968 Days
• Field of Search: 128/200.24, 128/204.18, 128/204.21, 128/204.23
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/00 Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes stimulating the respiratory movement by mechanical, pneumatic or electrical means, iron lungs combined with gas breathing means A61H31/00
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/022 Control means therefor
• CPC Class Codes: A61M 16/20 Valves specially adapted to medical respiratory devices
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit

Abstract

The ventilation module (8) regulates the inspiratory pressure (P) according to an inspiratory pressure order (AI). A control module (9) compares the breathed volume at each cycle (VTI) with a minimum volume order (VRImini) and varies the pressure order (AI) in the direction tending to maintain the breathed volume (VTI) just over the minimum (VTImini), but keeping the pressure order (AI) within the interval comprised between the two extreme values (AImini, AImaxi). Utilization to combine the advantages of the pressure mode ventilation with those of the volumetric ventilation.

Claims

1. A method for controlling a breathing aid apparatus, while providing breathing aid to a patient at a target gas pressure, the method comprising:

determining a breathed volume of the patient;

comparing the determined breathed volume with a predetermined volume threshold;

resetting the target gas pressure based at least on the determined breathed volume of the patient, by increasing the target gas pressure if the determined breathed volume is lower than the predetermined volume threshold and by decreasing the target gas pressure if the determined breathed volume is higher than the predetermined volume threshold; and

adjusting the pressure of gas delivered to the patient based on the reset target gas pressure.

2. A method according to claim 1, wherein the breathed volume for the patient comprises the volume inspired by the patient.

3. A method according to claim 1, wherein the breathed volume for the patient comprises the volume expired by the patient.

4. A method according to claim 1, further comprising:

detecting a pressure of gas delivered to the patient; and

adjusting the pressure of gas delivered to the patient based on the determined target gas pressure and the detected gas pressure.

5. A method according to claim 1, wherein adjusting the pressure of gas delivered to the patient based on the adjusted target gas pressure comprises adjusting the pressure of gas delivered to the patient to match the adjusted target gas pressure.

6. A method according to claim 1, further comprising:

comparing the target gas pressure to a minimum pressure threshold; and

wherein adjusting the target gas pressure based at least on the determined breathed volume comprises decreasing the target gas pressure if the target gas pressure is above the minimum pressure threshold.

7. A method for controlling a breathing aid apparatus while providing breathing aid to a patient, the method comprising:

determining a breathed volume of gas delivered to the patient;

determining an actual pressure of gas delivered to the patient; and

adjusting the pressure of gas delivered to the patient based on both the determined breathed volume and the determined actual gas pressure.

8. A method according to claim 7, wherein adjusting the pressure of gas delivered to the patient based on both the determined breathed volume and the determined actual gas pressure comprises:

determining a target gas pressure based at least on the determined breathed volume; and

adjusting the pressure of gas delivered to the patient based on the determined target gas pressure and the determined actual gas pressure.

9. A method according to claim 8, further comprising adjusting the pressure of gas delivered to the patient to match the determined target gas pressure.

10. A method according to claim 8, wherein adjusting the pressure of gas delivered to the patient based on the determined target gas pressure and the determined actual gas pressure comprises:

increasing the pressure of gas delivered to the patient if the determined actual gas pressure is lower than the determined target gas pressure; and

decreasing the pressure of gas delivered to the patient if the determined actual gas pressure is higher than the determined target gas pressure.

11. A method according to claim 7, wherein the breathed volume for the patient comprises the volume inspired by the patient.

12. A method according to claim 7, wherein the breathed volume for the patient comprises the volume expired by the patient.

13. A method according to claim 7, wherein adjusting the pressure of gas delivered to the patient based on both the determined breathed volume and the determined actual gas pressure comprises:

determining a target gas pressure based at least on the determined breathed volume;

comparing the target gas pressure to a minimum pressure threshold; and

decreasing the target gas pressure if the target gas pressure is above the minimum pressure threshold.

14. A method for controlling a breathing aid apparatus while providing breathing aid to a patient, the method comprising:

delivering gas to a patient according to a first target gas pressure;

determining an actual breathed volume for the patient;

setting a second target gas pressure based on both the determined breathed volume and a preset threshold volume, wherein the second target gas pressure is higher than the first target gas pressure if the actual breathed volume is lower than the preset threshold volume and the second target gas pressure is lower than the second target gas pressure if the actual breathed volume is higher than the preset threshold volume; and

delivering gas to the patient according to the second target gas pressure.

15. A method according to claim 14, wherein the breathed volume for the patient comprises the volume inspired by the patient.

16. A method according to claim 14, wherein the breathed volume for the patient comprises the volume expired by the patient.

17. A method according to claim 14, further comprising:

comparing the target gas pressure to a minimum pressure threshold; and

wherein adjusting the target gas pressure comprises decreasing the target gas pressure if the target gas pressure is above the minimum pressure threshold.