Respirator for different forms of respiration

• US 6,651,657 B1
• Filed: 04/18/2000
• Issued: 11/25/2003
• Est. Priority Date: 12/18/1999
• Status: Expired due to Term

• Current Assignee: Dragerwerk AG & Company KGaA (FPS Vermögensverwaltung GmbH)
• Original Assignee: Drager Medizintechnik GmbH
• Inventors: Manigel, Jürgen, Simmerer, Thomas
• Primary Examiner(s): Lo, Weilun
• Assistant Examiner(s): MITCHELL, TEENA KAY
• Application Number:
  US09/551,052
• Time in Patent Office: 1,316 Days
• Field of Search: 128/200.24, 128/204.18, 128/204.21, 128/204.22, 128/204.23, 128/204.26, 128/203.12, 128/203.14, 128/207.14, 128/205.18, 600/529, 600/533, 600/538
• US Class Current: 128/204.21
• CPC Class Codes: A61M 16/0078 Breathing bags
• CPC Class Codes: A61M 16/01 specially adapted for anaesthetising A61M16/104, A61M16/18 take precedence
• CPC Class Codes: A61M 16/22 Carbon dioxide-absorbing devices ; Other means for removing carbon dioxidecartridges with absorbing substances for respiratory apparatus A62B19/00
• 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
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities

Abstract

A respirator for supplying a patient with breathing is provided such that the respiration will not be compromised at the time of a changeover from one form of respiration to another form of respiration. Provisions are made for carrying out a first form of respiration with the corresponding first setting parameters and for taking over the corresponding setting parameters at least partially from the measured values determined during the first form of respiration and the first respiration parameters that remained invariant at the time of the changeover of the forms of respiration at the time of a changeover to a second form of respiration.

Claims

1. A respirator, comprising:

a volume-shifting device, said volume-shifting device for carrying out preselected forms of respiration;

a gas line system connected to said volume-shifting device for supplying a patient with breathing gas;

measuring devices for measuring at least airway pressure and breathing gas flow, wherein at least a plateau pressure (P_plat) and an inspiratory volume (V_T) of the breathing gas are determined as measured values;

a control unit, which contains an input unit for setting at least a first form of respiration and a second form of respiration as well as for entering at least first setting parameters belonging to the first form of respiration, said control unit generating control signals for at least said volume-shifting device in order to carry out the first form of respiration with the first setting parameters, said control unit being designed such that at a time of a changeover to a second form of respiration, second setting parameters are used to control the second form of respiration, said second setting parameters are selected at least partially from among the measured values determined during the first form of respiration.

2. The respirator in accordance with claim 1, wherein the volume-shifting device is a compressor actuated by a drive.

3. The respirator in accordance with claim 1, wherein an end-expiratory pressure (P_PEEP), an inspiration time (T_i) and an expiration time (T_e) are provided as common setting parameters for the first form of respiration and the second form of respiration.

4. The respirator in accordance with claim 1, wherein the first form of respiration is a volume-controlled respiration and the second form of respiration is a pressure-controlled respiration, and the first setting parameters include at least the inspiratory volume V_T, and at least a maximum airway pressure (P_insp), which is determined during the first form of respiration from the measured value of the plateau pressure (P_plat) by (P_insp)=(P_plat), is available as one of the second setting parameters.

5. The respirator in accordance with claim 4, wherein a maximum airway pressure (P_insp) is preset as a setting parameter during pressure-controlled respiration and the inspiratory volume (V_T) is determined as a measured value, and that the inspiratory volume (V_T) determined during the pressure-controlled respiration is used as a setting parameter at the time of the changeover to the volume-controlled respiration.

6. The respirator in accordance with claim 4, wherein a mean inspiratory flow (V_insp), determined as a volume per unit of time, is determined as an additional measured variable besides the inspiratory volume (V_T) during the pressure-controlled respiration.

7. The respirator in accordance with claim 4, wherein a maximum inspiratory pressure (P_max) is measured in addition to or as an alternative to the plateau pressure (P_plat) during the volume-controlled respiration.

8. A respirator comprising:

a volume-shifting device for carrying out preselected forms of respiration;

a gas line system connected to said volume-shifting device for supplying a patient with breathing gas;

a manual respiration device connected to said gas line system;

measuring devices for at least measuring airway pressure, breathing gas flow and breathing time, wherein at least a plateau pressure (P_plat), an inspiratory volume (V_T), an inspiration time (T_i) and an expiration time (T_e) are determined as measured values;

a control unit, which contains an input unit for setting a manual form of respiration and a mechanical form of respiration with corresponding setting parameters, said control unit generating control signals for said volume-shifting device during the mechanical form of respiration in order to carry out the respiration with said setting parameters, said measured values of said inspiration time (T_i), said expiration time (T_e) and said plateau pressure (P_plat) determined during the manual form of respiration are used as said setting parameters for the mechanical form of respiration.

9. The respirator in accordance with claim 8, wherein said inspiratory volume (V_T) is used as a setting parameter as an alternative to said plateau pressure (P_plat).

10. A process for controlling a respirator, the respirator having a volume-shifting device for carrying out preselected forms of respiration, a gas line system connected to the volume-shifting device for supplying a patient with breathing gas and measuring devices for measuring at least airway pressure (P_aw) and breathing gas flow, wherein at least a plateau pressure (P_plat) and an inspiratory volume (V_T) are determined as measured values, the process comprising the steps of:

carrying out a first form of respiration with first setting parameters;

determining-the plateau pressure (P_plat) or inspiratory volume (V_T) measured vales, which are not first setting parameters, during the first form of respiration; and

at a time of a changeover to a second form of respiration, selecting corresponding setting parameters at least partially from among the measured values determined during the first form of respiration and taking said selected corresponding setting parameters as second setting parameters for the second form of respiration.

11. The process in accordance with claim 10, wherein said end-expiratory pressure (P_PEEP), said inspiration time (T_i) and said expiration time (T_e) are used as common setting parameters for the first form of respiration and the second form of respiration.

12. The process in accordance with claim 10, wherein the first form of respiration is carried out as volume-controlled respiration and the second form of respiration is carried out as pressure-controlled respiration, and said inspiratory volume (V_T) is used as the first setting parameter and a maximum airway pressure (P_insp) is used as one of the second setting parameters, wherein the maximum airway pressure (P_insp) is determined from the plateau pressure (P_plat) as a measured value during the first form of respiration.

13. The process in accordance with claim 12, wherein the maximum airway pressure (P_insp) is preset as a setting parameter during the pressure-controlled respiration and the inspiratory volume (V_T) is determined as a measured value, and the inspiratory volume (V_T) determined during the pressure-controlled respiration is used as a setting parameter at the time of the changeover to the volume-controlled respiration.

14. The process in accordance with claim 13, wherein a mean inspiratory flow (V_insp), determined as a volume per unit of time, is determined as an additional measured variable, besides said inspiratory volume (V_t), during the pressure-controlled respiration.

15. The process in accordance with claim 12, wherein a mean inspiratory flow (V_insp), determined as a volume per unit of time, is determined as an additional measured variable, besides said inspiratory volume V_T, during the pressure-controlled respiration.

16. The process in accordance with claim 12, wherein the maximum inspiratory pressure (P_max) is measured in addition or as an alternative to the plateau pressure (P_plat) during the volume-controlled respiration.

17. A process for performing a plurality of different types of respiration, the process comprising the steps of:

providing a volume-shifting device;

supplying a patient with breathing gas from the volume-shifting device through a gas line system connected to said volume-shifting device;

controlling the volume-shifting device to perform a first type of respiration;

measuring a respiration parameter from the gas line system during operation of the first type of respiration;

controlling said volume shifting device to perform a second type of respiration, said controlling of said second type of respiration including using said respiration parameter measured during the first type of respiration to control said second type of respiration.

18. A process in accordance with claim 17, wherein:

said controlling to perform the second type of respiration is performed subsequent to said controlling to perform the first type of respiration.

19. A process in accordance with claim 17, wherein:

said controlling of the first type of respiration does not use said respiration parameter.

20. A process in accordance with claim 17, wherein:

the second type of respiration is performed immediately subsequent to operation of the first type of respiration;

said controlling of the second type of respiration uses a different type of control than said controlling of the first type of respiration.

21. A process in accordance with claim 17, wherein:

the first type of respiration is manual respiration;

said measuring includes measuring tidal volume, plateau pressure, inspiration time, and expiration time;

the second type of respiration uses pressure controlled respiration;

said controlling of the second type of respiration uses said plateau pressure, said inspiration time, and said expiration time to pressure control the respiration.

22. A process in accordance with claim 21, wherein:

said controlling of the second type of respiration uses said plateau pressure as a maximum airway pressure in the pressure controlled respiration.

23. A process in accordance with claim 17, wherein:

the first type of respiration is volume controlled respiration;

said measuring includes measuring plateau pressure;

the second type of respiration is pressure controlled respiration;

said controlling of the second type of respiration uses said plateau pressure to pressure control the respiration.

24. A process in accordance with claim 23, wherein:

said controlling of the second type of respiration uses said plateau pressure as a maximum airway pressure in the pressure controlled respiration.

25. A process in accordance with claim 17, wherein:

the first type of respiration is pressure controlled respiration;

said measuring includes measuring inspiratory volume;

the second type of respiration is volume controlled respiration;

said controlling of the second type of respiration uses said inspiratory volume to volume control the respiration.

26. A process in accordance with claim 17, wherein:

the first type of respiration is manual respiration;

said measuring includes tidal volume plateau pressure, inspiration time and expiration time;

the second type of respiration is volume controlled respiration;

said controlling of the second type of respiration uses said tidal volume, said inspiration time and said expiration time to volume control the respiration.