Hyperbaric resuscitation system and method

• US 6,944,485 B1
• Filed: 04/20/2000
• Issued: 09/13/2005
• Est. Priority Date: 04/20/2000
• 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): WINAKUR, ERIC FRANK
• Application Number:
  US10/019,548
• Time in Patent Office: 1,972 Days
• Field of Search: 600/310, 600/322, 600/323, 600/326, 600/473, 356/300, 356/319, 356/320
• US Class Current: 600/310
• CPC Class Codes: A61B 5/00 Measuring for diagnostic purposes radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00; Identification of persons
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue
• CPC Class Codes: A61B 5/4064 Evaluating the brain A61B5/031, A61B5/369, A61B5/14553 take precedence
• CPC Class Codes: A61B 5/6814 Head

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 system comprising:

(a) a light source;

(b) a pickup optode unit for detecting light from the light source;

(c) a spectrophotometer coupled to the pickup optode unit for sensing and recording a NIR wavelength interval including cytochrome oxidase, water and hemoglobin data;

(d) a personal computer with a software algorithm to extract via model-free mathematical operations the cytochrome oxidase, water and hemoglobin data from the NIR wavelength interval for evaluation and display.

2. The system of claim 1, wherein the light source is a stabilized pulsed light.

3. A method of using the system of claim 1 to monitor the change of any natural or manmade chromophore existing in a person'"'"'s brain to assist in the diagnosis or treatment of a neurological or psychotic disorder, comprising:

using the light source to illuminate a person'"'"'s cerebral tissue;

using the pickup optode unit to detect light from the person'"'"'s cerebral tissue;

using the spectrophotometer to sense and record a NIR wavelength interval including cytochrome oxidase, water and hemoglobin data;

using the personal computer and the software algorithm to extract the cytochrome oxidase, water and hemoglobin data from the NIR wavelength interval for evaluation.

4. The method of claim 3, wherein the light source is a stabilized pulsed light.

5. The method of claim 3, wherein the spectrophotometer monitors relative changes in redox levels in real-time.

6. The method of claim 3, wherein Fourier transforms are used in analyses of near infrared data obtained from the spectrophotometer.

7. The method of claim 3, wherein:

the spectrophotometer includes;

a background pickup device which receives photons that have traversed the patient'"'"'s scalp and skull but not deep enough to reach the patient'"'"'s cerebral cortex,

a sample pickup device that is positioned to receive photons that have traversed the patient'"'"'s scalp, skull dura matter, and pia, and

the background signal is subtracted from the sample signal by the algorithm to result in a signal representing the patient'"'"'s cerebral cortex.

8. The method of claim 3, wherein the light source is a quartz halogen 150 watt light source.

9. The method of claim 3, wherein the NIR wavelength interval is about 700–

1050 nm.

10. The method of claim 3, wherein oxygen in cerebral tissue is monitored by monitoring cytochrome oxidase in the cerebral tissue.

11. The method of claim 3, wherein oxygen in cerebral tissue is monitored by monitoring the redox ratio of cytochrome oxidase in the patient'"'"'s cerebral tissue.

12. The invention of claim 1, wherein the spectrophotometer monitors relative changes in redox levels in real-time.

13. The invention of claim 1, wherein the software algorithm uses Fourier transforms in analyses of near infrared data obtained from the spectrophotometer.

14. The invention of claim 1, wherein:

the spectrophotometer includes;

a background pickup device which receives photons that have traversed a patient'"'"'s scalp and skull but not deep enough to reach the patient'"'"'s cerebral cortex,

a sample pickup device that is positioned to receive photons that have traversed the patient'"'"'s scalp, skull dura matter, and pia, and

the background signal is subtracted from the sample signal by the software algorithm to result in a signal representing the patient'"'"'s cerebral cortex.

15. The system of claim 1, wherein the light source is a quartz halogen 150 watt light source.

16. The system of claim 1, wherein the NIR wavelength interval is about 700–

1050 nm.

17. The invention of claim 1, comprising means for monitoring oxygen in cerebral tissue by monitoring cytochrome oxidase in a patient'"'"'s cerebral tissue.

18. The invention of claim 1, comprising means for monitoring oxygen in cerebral tissue by monitoring the redox ratio of cytochrome oxidase in the cerebral tissue.

19. The system of claim 1, further comprising connecting fiber optics attached to the light source.

20. The system of claim 19, further comprising a near infrared band pass filter and wherein the spectrophotometer is a dual wave interval spectrophotometer.

21. The system of claim 1, further comprising a near infrared band pass filter.

22. The system of claim 1, wherein the spectrophotometer is a dual wave interval spectrophotometer.