Delta Flow Pressure Regulation

• US 20080276939A1
• Filed: 06/27/2005
• Published: 11/13/2008
• Est. Priority Date: 07/08/2004
• Status: Abandoned Application

• Current Assignee: General Electric Company
• Original Assignee: Breas Medical Ab (Shanghai Fosun Pharmaceutical (Group) Co., Ltd.)
• Inventors: Tiedje, Mikael
• Application Number:
  US11/570,936
• Publication Number:
  US 20080276939A1
• Time in Patent Office: Days
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2205/3375 Acoustical, e.g. ultrasonic, measuring means
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2230/04 Heartbeat characteristics, e.g. ECG, blood pressure modulation
• CPC Class Codes: A61M 2230/10 Electroencephalographic signals
• CPC Class Codes: A61M 2230/18 Rapid eye-movements [REM]
• CPC Class Codes: A61M 2230/205 partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 2230/435 partial O2 pressure (P-O2)
• CPC Class Codes: A61M 2230/50 Temperature
• CPC Class Codes: A61M 2230/60 Muscle strain, i.e. measured on the user

Abstract

A method, system, apparatus, and computer program for detecting breathing pattern changes and controlling a mechanical ventilator in accordance to changes of breathing air flow thus reducing the work of breathing for the patient.

Claims

1. A mechanical ventilator apparatus (4) for supplying breathing gas to humans (1), the ventilator comprising:

a ventilator arrangement (4);

a processing unit (201); and

input means for obtaining signals (5, 6, 7, 8, 9, 10) indicative of at least breathing gas flow and pressure;

wherein said processing unit (201) is arranged to analyze said flow signals determining flow change values, using said flow change values as pressure values in a pressure regulating procedure, and regulating said pressure against a set pressure demand value.

2. The apparatus according to claim 1, wherein said processing unit (201) is arranged to filter said flow signals in a noise reducing filter, such as a low-pass filter, prior to analyzing said flow signals.

3. The apparatus according to claim 1, wherein said sensing means for sensing flow signals is arranged at a mechanical ventilator side of tubing (3) for supplying breathing gas.

4. The apparatus according to claim 1, wherein said measured data being preprocessed and preformatted prior to filtering said measured signal data.

5. A method for facilitating breathing in connection with a mechanical ventilator arrangement (4), comprising the steps of:

measuring signals indicative of a breathing gas flow and pressure;

processing said breathing gas flow for flow changes;

using said flow change values as pressure values in a pressure regulating procedure; and

responding to changes of pressure signal obtained from said flow change values in a breathing gas tubing (3) by changing control signals for said mechanical ventilator (4), changing said pressure in said tubing (3) to a set demand pressure using said measured pressure and flow changes as input parameters in a regulating procedure.

6. The method according to claim 5, further comprising a step of filtering said air flow signal prior to processing said breathing gas flow for flow changes.

7. The method according to claim 5, further comprising a step of placing said sensing means for sensing flow signals at a mechanical ventilator side of tubing (3) for supplying breathing gas.

8. A system for facilitating breathing when using a mechanical ventilator arrangement, comprising:

at least two sensing means (5, 6, 7, 8, 9, 10) for measuring signals indicative of flow and pressure of breathing gas to a patient (1);

a breathing gas tubing (3) and breathing gas distribution means (2);

a mechanical ventilator apparatus (4); and

a processing unit (11, 201);

wherein said processing unit is arranged to process data obtained from said sensing means (5, 6, 7, 8, 9, 10) for measuring flow of breathing, using flow change values as input parameters in a pressure regulating procedure, and change controls signals for controlling the supply of breathing gas in order to keep a set pressure.

9. The system according to claim 8, wherein said processing unit is arranged to apply said flow signals to a filtering procedure in order to reduce noise.

10. The system according to claim 8, wherein said sensing means for sensing flow signals is arranged at a mechanical ventilator side of tubing (3) for supplying breathing gas.

11. A computer program for controlling a mechanical ventilator apparatus, wherein said program operate on signals obtained from at least two sensing means for measuring flow and pressure of breathing gas to a patient (1), said program using data indicative of flow changes of breathing obtained from said flow measurement in a pressure regulating procedure, and said program transmitting control signals to a mechanical ventilator in response to changes of the pressure of breathing gas using said flow change data as a pressure value compared against a set demand pressure value together with said measured pressure.

12. The computer program according to claim 11, wherein said computer program is arranged to filter said flow signals prior to analyzing said flow data for flow changes in order to reduce noise.

13. The computer program according to claim 11, further arranged to operate on flow signals obtained from said sensing means (10) being arranged at a mechanical ventilator side of tubing (3) for supplying breathing gas.

14. The computer program according to claim 12, wherein said measured data is preprocessed and preformatted prior to filtering said measured signal data.