Apparatus for high continuous flow augmentation of ventilation and method therefor

• US 5,101,820 A
• Filed: 11/02/1989
• Issued: 04/07/1992
• Est. Priority Date: 11/02/1989
• Status: Expired due to Term

• Current Assignee: Cs Medical, Inc.
• Original Assignee: Kent L. Christopher
• Inventors: Christopher, Kent L.
• Primary Examiner(s): Burr, Edgar S.
• Assistant Examiner(s): Lewis, Aaron J.
• Application Number:
  US07/431,026
• Time in Patent Office: 887 Days
• Field of Search: 128/201.21, 128/203.25, 128/203.26, 128/204.17, 128/204.21, 128/204.23, 128/205.11, 128/207.14, 128/207.15, 128/207.16
• US Class Current: 128/204.18
• CPC Class Codes: A61M 16/0465 Tracheostomy tubes; Devices for performing a tracheostomy; Accessories therefor, e.g. masks, filters
• CPC Class Codes: A61M 16/0841 for sampling
• CPC Class Codes: A61M 16/10 Preparation of respiratory gases or vapours
• CPC Class Codes: A61M 16/101 using an oxygen concentrator
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2202/0007 introduced into the body
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2202/03 Gases in liquid phase, e.g. cryogenic liquids
• CPC Class Codes: A61M 2205/3368 Temperature

Abstract

The present invention provides a system for augmenting ventilation and removing carbon dioxide of a spontaneous-breathing patient and a method of use thereof. The system further allows relaxation of the breathing process thus reducing fatigue of the patient. The system involves providing a high continuous flow of a humidified oxygen/air mixture at a predetermined oxygen content and at a constant flow rate through a transtracheal catheter into the lungs of the patient. The system typically provides an oxygen/air mixture of at least 21 percent oxygen, at a humidity between 80 to 100 percent, and a temperature of 35 to 38 C. The mixture is delivered through the transtracheal catheter at a flow rate of 8 to 20 liters per minute at a back pressure of 2 to 25 psi.

Claims

1. An open delivery system for continuous flow augmentation and ventilation of a patient, said system comprising:

means for maintaining the lungs of a patient open to the ambient atmosphere including means for allowing a patient to breathe spontaneously thereby removing carbon dioxide;

means for providing a continuous flow of an oxygen/air mixture of at least twenty-one percent oxygen,

means connected to said providing means for selectively controlling said continuous flow of said oxygen/air mixture at a constant flow rate in a flow rate of eight to twenty liters per minute,

means connected to said controlling means for regulating the pressure of said oxygen/air mixture generated by said providing means in a back pressure range of two to twenty-five pounds per square inch,

means connected to said regulating means for maintaining the humidity of said oxygen/air mixture in a humidity range of eighty to one hundred percent, said maintaining means being further capable of maintaining the temperature of said oxygen/air mixture in a temperature range of thirty-five to thirty-eight degrees Celsius, and

a transtracheal catheter connected to said maintaining means for continuously delivering said oxygen/air mixture into the trachea of said patient.

2. The system of claim 1 wherein said providing means comprises:

means for storing liquid oxygen,

an air compressor for compressing air, and

means connected to said storing means and to said air compressor for adjustably blending said oxygen from said storing means with air from said air compressor to form said oxygen/air mixture.

3. The system of claim 1 wherein said providing means comprises:

a concentrator for generating oxygen,

an air compressor for compressing air, and

means connected to said generating means and to said air compressor for adjustably blending said oxygen from said generating means with air from said air compressor to form said oxygen/air mixture.

4. The system of claim 1 wherein said providing means is an enricher.

5. The system of claim 1 wherein said controlling means is a flow meter.

6. The system of claim 1 wherein said regulating means is a pop-off valve.

7. The system of claim 1 wherein said maintaining means comprises:

a humidifier,

a tube having one end connected to said humidifier for carrying said oxygen/air mixture,

a heated wire in said tube for heating said oxygen/air mixture,

a temperature probe at the other end of said tube for measuring the temperature of said oxygen/air mixture as it leaves said tube, and

means connected to said heated wire and to said temperature probe for adjustably setting the temperature of said oxygen/air mixture in said temperature range.

8. The system of claim 1 wherein said transtracheal catheter comprises a catheter having an outside diameter of less than 3.5 millimeters.

9. The system of claim 1 wherein said transtracheal catheter comprises a catheter having an inside diameter of 1.7 to 3.0 millimeters.

10. The system of claim 1 wherein said transtracheal catheter uses a high tech biopolymer having a durometer of 70-90 Shore A.

11. A method for continuous flow augmentation of ventilation and removal of CO₂ from a patient in an open delivery system during spontaneous breathing of providing a transtracheal catheter inserted into the trachea of a patient the patient, said method comprising the steps of:

providing a continuous ratio of an oxygen/air mixture having at least twenty-one percent oxygen,

selectively controlling the flow of said oxygen/air mixture at a constant flow value in a range of eight to twenty liters per minute,

regulating the pressure of said oxygen/air mixture from said providing means at a preselected pressure in a range of two to twenty pounds per square inch,

maintaining constant humidity and temperature values for said oxygen/air mixture said humidity values being in a range of eighty to one hundred percent and said temperature values being in a range of thirty-five to thirty-eight degrees Celcius,

continuously delivering said oxygen/air mixture into the trachea of said patient in said tranchrocheal catheter, allowing the removal of CO₂ at a desired level, while allowing the respiratory muscles of the patient to relax while allowing the patient to spontaneously breathe at any time.