Hyperbaric resuscitation system and method

• US 6,283,123 B1
• Filed: 04/20/2000
• Issued: 09/04/2001
• Est. Priority Date: 12/01/1994
• Status: Expired due to Fees

• Current Assignee: Frederick A. Kriedt, Keith W Van Meter
• Original Assignee: Frederick A. Kriedt, Keith W Van Meter
• Inventors: Kriedt, Frederick A., Van Meter, Keith W.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): SRIVASTAVA, VIRENDRA KUMAR
• Application Number:
  US09/553,535
• Time in Patent Office: 502 Days
• Field of Search: 128/205, 128/26, 128/202, 128/12, 128/204, 128/18, 128/204.23, 600/323, 600/320, 600/314
• US Class Current: 128/205.26
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/043 in a linear array
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue
• CPC Class Codes: A61B 5/4076 Diagnosing or monitoring particular conditions of the nervous system A61B5/4821, A61B5/4824 take precedence
• CPC Class Codes: A61B 5/7257 using Fourier transforms
• CPC Class Codes: A61B 5/7275 Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor
• CPC Class Codes: A61G 10/026 for hyperbaric oxygen therapy

Abstract

A hyperbaric resuscitation system (10) includes a hyperbaric chamber (20) having a volume sufficient to enclose a human patient (1) and at least two operating personnel (60). The system (10) also includes a device for pressurizing the hyperbaric chamber (20) to at least 1.5 atmospheres with air. The concentration of oxygen in high pressure, oxygen-rich gas to be breathed by the patient (1) provided by an independent system (41) at chamber pressure is automatically regulated by a regulating system (33) which receives information about the amount of oxygen in cerebral tissue of the patient (1) from a spectrophotometer (51, 52). Although devices for measuring the exact amount of oxygen in cerebral tissue do not yet exist, the presently available devices can show trends in the amount of oxygen in the tissue. Since the physician working on a patient in a hyperbaric resuscitation system is more concerned about trending than exact values, the present system can still be of great benefit in resuscitating patients.

Claims

1. A hyperbaric resuscitation system comprising:

(a) a hyperbaric chamber having a volume sufficient to enclose a human patient;

(b) first pressurizing means for pressurizing the hyperbaric chamber to at least 1.5 atmospheres;

(c) means for providing oxygen-rich gas to be breathed by the patient;

(d) second pressurizing means for pressurizing the oxygen-rich gas to a pressure similar to that of the hyperbaric chamber;

(e) a non-invasive monitoring means for monitoring oxygen in cerebral tissue of the patient; and

(f) regulating means for regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the non-invasive monitoring means.

2. The system of claim 1, further comprising analyzing means for analyzing readings of the non-invasive monitoring means.

3. The system of claim 1, wherein the non-invasive monitoring means includes means for monitoring trends in oxygen content.

4. The system of claim 1, wherein the non-invasive monitoring means includes means for monitoring oxidized cytochrome oxidase, reduced cytochrome oxidase, oxygenated hemoglobin, and deoxygenated hemoglobin.

5. The invention of claim 1, wherein the chamber has a volume sufficient to enclose a human patient and at least two operating personnel.

6. A hyperbaric resuscitation system comprising:

(a) a hyperbaric chamber having a volume sufficient to enclose a human patient;

(b) first pressurizing means for pressurizing the hyperbaric chamber to at least 1.5 atmospheres;

(c) means for providing oxygen-rich gas to be breathed by the patient;

(d) second pressurizing means for pressurizing the oxygen-rich gas to a pressure similar to that of the hyperbaric chamber;

(e) a spectrophotometer for non-invasively monitoring oxygen in cerebral tissue of the patient; and

(f) regulating means for regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the spectrophotometer.

7. The system of claim 6, further comprising analyzing means for analyzing readings of the spectrophotometer.

8. The system of claim 6, further comprising means for automatically regulating oxygen concentration and pressure using information from the spectrophotometer.

9. A hyperbaric resuscitation method comprising:

(a) placing a patient in a hyperbaric chamber having a volume sufficient to enclose a human patient;

(b) pressurizing the hyperbaric chamber to at least about 1.5 atmospheres;

(c) providing oxygen-rich gas to be breathed by the patient;

(d) pressurizing the oxygen-rich gas to a pressure similar to that of the hyperbaric chamber;

(e) monitoring oxygen in cerebral tissue of the patient with a non-invasive monitoring means; and

(f) regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the non-invasive monitoring means.

10. The method of claim 9, further comprising the step of analyzing readings of the non-invasive monitoring means.

11. The method of claim 9, wherein the non-invasive monitoring means includes means for monitoring trends in oxygen content.

12. The method of claim 9, wherein the non-invasive monitoring means includes means for monitoring oxidized cytochrome oxidase, reduced cytochrome oxidase, oxygenated hemoglobin, and deoxygenated hemoglobin.

13. A system comprising:

(a) a chamber having a volume sufficient to enclose a human patient;

(b) first pressure regulating means for causing the chamber to have a pressure of about 1-4 atmospheres;

(c) means for providing oxygen-rich gas to be breathed by the patient;

(d) second pressure regulating means for causing the oxygen-rich gas to have a pressure similar to that of the chamber;

(e) a non-invasive monitoring means for monitoring oxygen in cerebral tissue of the patient; and

(f) oxygen regulating means for regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the non-invasive monitoring means.

14. The system of claim 13, further comprising analyzing means for analyzing readings of the non-invasive monitoring means.

15. The system of claim 13, wherein the non-invasive monitoring means includes means for monitoring trends in oxygen content.

16. The system of claim 13, wherein the non-invasive monitoring means includes means for monitoring oxidized cytochrome oxidase, reduced cytochrome oxidase, oxygenated hemoglobin, and deoxygenated hemoglobin.

17. The system of claim 13, wherein the non-invasive monitoring means monitors oxygen availability to the cerebral tissue.

18. A system comprising:

(a) a chamber having a volume sufficient to enclose a human patient;

(b) first pressure regulating means for causing the chamber to have a pressure of about 1-4 atmospheres;

(c) means for providing oxygen-rich gas to be breathed by the patient;

(d) second pressure regulating means for causing the oxygen-rich gas to have a pressure similar to that of the chamber;

(e) a spectrophotometer for non-invasively monitoring oxygen in cerebral tissue of the patient; and

(f) oxygen regulating means for regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the spectrophotometer.

19. The system of claim 18, further comprising analyzing means for analyzing readings of the spectrophotometer.

20. The system of claim 18, further comprising means for automatically regulating oxygen concentration and pressure using information from the spectrophotometer.

21. A treatment method comprising:

(a) placing a patient in a chamber having a volume sufficient to enclose a human patient;

(b) regulating the pressure of the chamber at about 1-4 atmospheres;

(c) providing oxygen-rich gas to be breathed by the patient;

(d) maintaining the oxygen-rich gas at a pressure similar to that of the chamber;

(e) monitoring oxygen in cerebral tissue of the patient with a non-invasive monitoring means; and

(f) regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the non-invasive monitoring means.

22. The method of claim 21, further comprising the step of analyzing readings of the non-invasive monitoring means.

23. The method of claim 21, wherein the non-invasive monitoring means includes means for monitoring trends in oxygen content.

24. The method of claim 21, wherein the non-invasive monitoring means includes means for monitoring oxidized cytochrome oxidase, reduced cytochrome oxidase, oxygenated hemoglobin, and deoxygenated hemoglobin.

25. A system for providing oxygen-rich gas to be breathed by a patient comprising:

(a) means for providing oxygen-rich gas to be breathed by the patient;

(b) a non-invasive monitoring means for monitoring oxygen in cerebral tissue of the patient; and

(c) regulating means for regulating the concentration of oxygen in the oxygen-rich gas in response to readings of the non-invasive monitoring means.

26. The system of claim 25, further comprising analyzing means for analyzing readings of the non-invasive monitoring means.

27. The system of claim 25, wherein the non-invasive monitoring means includes means for monitoring trends in oxygen content.

28. The system of claim 25, wherein the non-invasive monitoring means includes means for monitoring oxidized cytochrome oxidase, reduced cytochrome oxidase, oxygenated hemoglobin, and deoxygenated hemoglobin.

29. The invention of claim 25, wherein the non-invasive monitoring means monitors relative changes in redox levels in real-time.

30. The invention of claim 25, wherein Fourier transforms are used in analyses of near infrared data obtained from the non-invasive monitoring means.

31. The invention of claim 30, wherein Fourier deconvolution is used in analyses of near infrared data obtained from the non-invasive monitoring means.

32. The invention of claim 25, wherein oxygen in cerebral tissue is monitored by monitoring cytochrome oxidase in the cerebral tissue.

33. The invention of claim 25, wherein oxygen in cerebral tissue is monitored by monitoring the redox ration of cytochrome oxidase in the cerebral tissue.