Energy Trigger

• US 20080283061A1
• Filed: 06/27/2005
• Published: 11/20/2008
• Est. Priority Date: 07/08/2004
• Status: Active Grant

• Current Assignee: Breas Medical Ab (Shanghai Fosun Pharmaceutical (Group) Co., Ltd.)
• Original Assignee: Breas Medical Ab (Shanghai Fosun Pharmaceutical (Group) Co., Ltd.)
• Inventors: Tiedje, Mikael
• Granted Patent: US 8,910,632 B2
• 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 and apparatus for facilitating breathing using a mechanical breathing gas ventilator is presented. The patient effort is deduced from a measured flow signal and analyzed with respect to the energy in the breathing system comprising the mechanical ventilator and the patient. When a predetermined energy threshold has been reached the ventilator responds to the breathing pattern change.

Claims

1. A mechanical ventilator apparatus for supplying breathing gas to humans, the ventilator comprise:

a ventilator arrangement;

a processing unit; and

input means for obtaining signals from sensors indicative of at least breathing gas flow;

wherein said processing unit is arranged to analyze said flow signals with respect to energy content, trigger a response if said energy content reaches a trigger level, and to regulate a supply of said breathing gas according to said reached trigger level.

2. The apparatus according to claim 1, wherein said processing unit is arranged to apply said flow signal to a derivative procedure in order to deduce said energy content and compare an output from said derivative procedure with at least one predetermined trigger level.

3. The apparatus according to claim 2, wherein said derivative output is indicative of the inhalation start phase.

4. The apparatus according to claim 2, wherein said derivative output is indicative of the exhalation start phase.

5. The apparatus according to claim 1, further comprising input means for obtaining a signal indicative of pressure, used in said analysis for energy content together with said signal indicative of breathing gas flow.

6. A method for facilitating breathing in connection with a mechanical ventilator arrangement, comprising the steps of:

acquiring a breathing gas flow signal;

processing said breathing gas flow signal for energy content;

determining if said energy content has reached a trigger level; and

responding to said reached trigger level by changing control signals for said mechanical ventilator, said control signals controlling a supply of breathing gas.

7. The method according to claim 6, wherein said processing unit is applying said flow signal to a derivative procedure in order to deduce said energy content and comparing an output from said derivative procedure with at least one predetermined trigger level.

8. The method according to claim 6, further comprising the steps of:

measuring a breathing gas pressure; and

using said pressure measurement in said processing for energy content.

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

at least one sensing means for acquiring a signal indicative of at least flow of breathing gas to a patient;

a breathing gas tubing and breathing gas distribution means, a mechanical ventilator apparatus; and

a processing unit;

wherein said processing unit is arranged to process data obtained from a breathing gas flow measurement using said sensing means, and is arranged to determine energy content from said flow data in order to determine when a trigger level is reached by data indicative of energy of breathing, and said processing unit further being arranged to output control signals to said mechanical ventilator apparatus, regulating breathing gas supply.

10. The system according to claim 9, wherein said processing unit being arranged to apply said flow signal to a derivative procedure in order to deduce said energy content and compare an output from said derivative procedure with at least one predetermined trigger level.

11. The system according to claim 9, further comprising:

sensing means for measuring breathing gas pressure;

said processing unit being arranged to process data from both flow and pressure measurements in order to deduce energy content.

12. A computer program for controlling a mechanical ventilator apparatus, wherein said program operate on signals obtained from at least one sensing means for measuring flow of breathing gas to a patient, said program determining if a trigger level has been reached by data indicative of energy of breathing derived from said flow measurement, and said program transmitting control signals, for controlling a supply of breathing gas, to said mechanical ventilator in response if said trigger level has been reached.

13. The computer program according to claim 12, wherein said computer program is arranged to apply said flow signal to a derivative procedure in order to deduce said energy content and compare an output from said derivative procedure with at least one predetermined trigger level.

14. The computer program according to claim 13, wherein said output from said derivative procedure is indicative of the inhalation rise phase

15. The computer program according to claim 13, wherein said output from said derivative procedure is indicative of the exhalation fall phase.

16. The computer program according to claim 12, further using data obtained from measurement of breathing gas pressure together with flow measurements in determining energy content.