Artificial ventilation apparatus

• US 20040016431A1
• Filed: 01/10/2003
• Published: 01/29/2004
• Est. Priority Date: 07/11/2000
• Status: Abandoned Application

• Current Assignee: Taema (Air Liquide SA)
• Original Assignee: Taema (Air Liquide SA)
• Inventors: Preveyraud, Laurent
• Application Number:
  US10/332,740
• Publication Number:
  US 20040016431A1
• Time in Patent Office: Days
• US Class Current: 128/204.18
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/1055 bacterial
• CPC Class Codes: A61M 16/107 in the inspiratory path
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2039/1005 Detection of disconnection
• CPC Class Codes: A61M 2205/15 Detection of leaks

Abstract

The invention concerns a patient'"'"'s ventilation with breathing mixture The installation comprises a ventilating assembly (10) for delivering said breathing mixture provided with a sensor for measuring the pressure (26) of the delivered mixture and a sensor for measuring the flow rate (28) of the delivered mixture; an inhalation conduit (12); and a device (30) for detecting accidental disconnection of the ventilation circuit comprising processing means (32, 34) for calculating, for each ventilating cycle, an apparent coefficient of the patient'"'"'s compliance based on the measurements carried out by said pressure and flow rate sensors, using a predetermined formula; means (32, 34) for determining the sign of said compliance coefficient; means (32, 34) for comparing said compliance coefficient to a predetermined positive value; and means (40) for triggering a warning (42, 44) if the compliance coefficient is negative or if the compliance coefficient is higher than said predetermined value.

Claims

1. An installation for ventilating a patient with breathing mixture comprising:

a ventilating assembly for delivering said breathing mixture provided with a sensor for measuring the pressure of the delivered mixture and/or a sensor for measuring the flow rate of the delivered mixture;

an inhalation conduit; and

a device for detecting the accidental dis-connection of the ventilating circuit comprising;

processing means for calculating, for each ventilating cycle, an apparent compliance coefficient of the patient based on measurements carried out by said pressure and flow rate sensors, using a predetermined formula,

means for determining the sign of said compliance coefficient,

means for comparing said compliance coefficient with a predetermined positive value and

means for triggering an alarm if the compliance coefficient is negative or if the compliance coefficient is greater than said predetermined value.

2. The ventilating installation operating in a mode without positive exhalation pressure as claimed in claim 1, characterized in that said predetermined formula is of the type:

3. The ventilating installation operating in a mode with positive exhalation pressure as claimed in claim 1, characterized in that said predetermined formula is of the type:

4. The ventilating installation as claimed in any one of claims 1 to 3, characterized in that said predetermined value is about 300 expressed in ml/cm of H₂O.

5. A method of detecting the accidental disconnection of the inhalation circuit of an installation for ventilating a patient with breathing mixture, comprising a ventilating assembly, comprising the following steps:

the pressure and/or the flow rate of breathing mixture is measured or determined at the outlet of the ventilating assembly for one ventilating cycle;

an apparent compliance coefficient of the patient is calculated, from said measurements, using a predetermined equation;

an alarm is triggered if the value of said compliance coefficient is negative or if it is greater than a predetermined value.

6. The method as claimed in claim 5, characterized in that said predetermined formula is of the type:

7. The method as claimed in claim 5, characterized in that said predetermined formula is of the type:

8. The method as claimed in any one of claims 5 to 7, characterized in that said predetermined value is about 300 expressed in ml/cm of H₂O.