Method and device for producing respiratory air which is harmless to health in positive pressure nasal breathing apparatus

• US 6,332,462 B1
• Filed: 11/03/1997
• Issued: 12/25/2001
• Est. Priority Date: 05/03/1995
• Status: Expired due to Fees

• Current Assignee: Holger Krohn
• Original Assignee: Holger Krohn
• Inventors: Krohn, Holger
• Primary Examiner(s): Lewis, Aaron J.
• Application Number:
  US08/945,690
• Time in Patent Office: 1,513 Days
• Field of Search: 128/204.18, 128/204.15, 128/204.16
• US Class Current: 128/204.15
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/1075 by influencing the temperature A61M16/1045 takes precedence
• CPC Class Codes: A61M 2205/3606 cooled

Abstract

The invention concerns a positive pressure nasal breathing apparatus in which a processed air flow is supplied at positive pressure to the person to be treated. The apparatus comprises: a first device (10) for producing a first air flow which has a given first temperature and a first degree of relative air humidity; and a second device (12) for processing the first air flow such that a second air flow to be completely or partially supplied to the person is produced. The temperature of the second air flow is lower and its degree of relative air humidity higher than that of the first air flow.

Claims

1. A CPAP (Continuous Positive Air Pressure) respiratory apparatus for home positive pressure respiration of persons with obstructive sleep apnea syndrome comprising a fan for creating the positive pressure and a heat exchanger including a Peltier element having a hot side and a cold side, the heat exchanger being inserted into the air stream of the fan, said heat exchanger cooling the air stream supplied by the fan to a temperature 2-4 degrees Celcius below ambient temperature before it is supplied to a nose mask and exit openings;

the heat exchanger further comprising first and second cooling profiles with the Peltier element being connected to the first cooling profile and the hot side being connected to the second cooling profile.

2. The CPAP (Continuous Positive Air Pressure) respiratory apparatus of claim 1 characterized in that the first cooling profiles have an “

E”

shape and form a meandering cooling channel for the air stream supplied by the fan between an air entrance and an air exit.

3. The CPAP (Continuous Positive Air Pressure) respiratory apparatus of claim 1 characterized in that the supplied air stream is cooled by 2 to 4°

C. below the ambient temperature.

4. The CPAP (Continuous Positive Air Pressure) respiratory apparatus of claim 3 characterized in that the supplied air stream is cooled by 3°

C. below the ambient temperature.

5. The CPAP (Continuous Positive Air Pressure) respiratory apparatus of claim 1 characterized in that the supplied air stream is cooled by 3 degrees Celcius below ambient temperature.

6. In a method for CPAP (Continuous Positive Air Pressure) for home positive pressure respiration of persons with obstructive sleep apnea syndrome, the improvement comprising:

providing a fan and generating a positive pressure air stream from the fan and providing a nose mask having exit openings and operatively connecting the nose mask to the positive pressure air stream;

providing a heat exchanger and inserting the heat exchanger into the positive pressure air stream;

conveying the air stream from the heat exchanger through a breathing tube to the nose mask and exit openings therein, cooling the positive pressure air stream with the heat exchanger to a temperature minus 2-4 degrees Celcius below ambient temperature thereby increasing the relative humidity of the air stream;

supplying the cooled positive pressure air stream to the nose mask and exit openings for maintaining the respiratory air rich in oxygen;

maintaining the exit openings open by avoiding any formation of condensation from the cooled positive pressure air stream in the breathing tube and in the exit openings; and

facilitating an exhaust of exhaled air through the exit openings.

7. The method of claim 6 including providing cooling in the heat exchanger by a Peltier element.

8. The method of claim 7 including providing the heat exchanger with first and second cooling profiles.

9. The method of claim 8 including connecting the first cooling profile of the heat exchanger to a cold side of the Peltier element and connecting the second profile of the heat exchanger with a hot side of the Peltier element.

10. The method of claim 9 wherein the first cooling profile has an E-shape and forms a meandering cooling channel for the air stream supplied by the fan between an air entrance and an air exit.

11. The method of claim 6 including cooling the air stream to a temperature of 3°

C. below the ambient temperature.