Ventilator and method for controlling same to reproduce a manually generated breathing pattern

• US 5,875,777 A
• Filed: 04/24/1997
• Issued: 03/02/1999
• Est. Priority Date: 04/26/1996
• Status: Expired due to Fees

• Current Assignee: Ormet Corporation, Siemens Elema AB
• Original Assignee: Siemens Elema AB
• Inventors: Eriksson, Per-Goran
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): SRIVASTAVA, VIRENDRA KUMAR
• Application Number:
  US08/842,368
• Time in Patent Office: 677 Days
• Field of Search: 128/204.21, 128/204.23, 128/204.28, 128/205.13, 128/205.28, 128/203.12, 128/203.14
• US Class Current: 128/204.21
• CPC Class Codes: A61M 16/0078 Breathing bags
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/203 Proportional
• CPC Class Codes: A61M 16/204 used for inhalation control
• CPC Class Codes: A61M 16/205 used for exhalation control
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities

Abstract

In a ventilator system and a method for controlling the ventilator system, a hand ventilator is connectable to a patient to impose a manually generated breathing pattern on the patient. A measurement unit is arranged by the hand ventilator to measure at least one of the parameters pressure and flow of the manually generated breathing pattern. The measured parameters are supplied to a memory unit in a regulatory unit, which operates a control unit so as to regulate a valve unit for imposing a mechanically generated breathing pattern, corresponding to the manually generated breathing pattern, on the patient. The measured parameters can be re-scaled in a calculation unit before the control unit controls the valve unit.

Claims

1. A method for controlling a valve unit in a ventilator system comprising the steps of:

manually generating a breathing pattern, said breathing pattern including pressure, flow and duration parameters;

measuring at least one of said parameters of said breathing pattern to obtain a measured parameter;

storing said measured parameter as a stored parameter; and

operating a valve unit in a ventilator system using said stored parameter as a reference value for reproducing said manually generated breathing pattern as a mechanically generated breathing pattern.

2. A method as claimed in claim 1 wherein the step of measuring said at least one parameter comprises measuring said at least one parameter over a plurality of consecutive breathing cycles of said manually generated breathing pattern, generating an average value of said at least one parameter over said plurality of consecutive breathing cycles, and storing said average value as said stored parameter and using said average value as said reference value.

3. A method as claimed in claim 1 comprising the additional step of re-scaling said stored parameter to produce said reference value.

4. A ventilator system comprising:

a source of breathing gas;

means adapted for delivering said breathing gas to a patient in a breathing gas flow;

valve means for imposing a breathing pattern on said breathing gas flow, said breathing gas flow with said breathing pattern imposed thereon having parameters of gas pressure, gas flow and duration;

measurement means for measuring at least one of said parameters for producing at least one measured parameter;

memory means for storing said at least one measured parameter as at least one stored parameter;

control means for controlling said valve means according to said at least one stored parameter;

switch means, connected to said memory means and to said control means for, in a first switching state, causing said memory means to store said at least one measured parameter as said at least one stored parameter and for, in a second switching state, causing said control means to control said valve means according to said at least one stored parameter; and

manually-operated ventilator means for generating a manual breathing pattern as said selected breathing pattern, with said switching means in said first switching state for storing a parameter of said manually generated breathing pattern as said stored parameter.

5. A ventilator system as claimed in claim 4 wherein said memory means comprises means for storing said at least one parameter over a plurality of consecutive breathing cycles of said breathing pattern, and further comprising calculating means for calculating an average value of said at least one parameter over said plurality of consecutive breathing cycles, said control means comprising means for using said average value for controlling said valve means.

6. A ventilator system as claimed in claim 4 wherein said control means comprises means for re-scaling said at least one stored value for use in controlling said valve means.

7. A ventilator system as claimed in claim 4 comprising a stand-alone breathing assist device containing said valve means, and a separate regulatory unit, connectable to said stand-alone breathing assist unit, containing said manually-operable ventilator means, said measurement means, said memory means and said control means.

8. A ventilator system comprising:

means for manually generating a breathing pattern, said breathing pattern including pressure, flow and duration parameters;

measurement means for measuring at least one of said parameters of said breathing pattern to obtain a measured parameter;

memory means for storing said measured parameter as a stored parameter;

a valve unit; and

means for operating said valve unit using said stored parameter as a reference value for reproducing said manually generated breathing pattern as a mechanically generated breathing pattern.

9. A ventilator system as claimed in claim 8 wherein said measurement means comprises means for measuring said at least one parameter comprises measuring said at least one parameter over a plurality of consecutive breathing cycles of said manually generated breathing pattern, means for generating an average value of said at least one parameter over said plurality of consecutive breathing cycles, wherein said memory means comprises means for storing said average value as said stored parameter and wherein said means for operating said valve unit uses said average value as said reference value.

10. A ventilator system as claimed in claim 8 further comprising means for re-scaling said stored parameter to produce said reference value.