METHOD AND APPARATUS FOR DETERMINING CEREBRAL DESATURATION IN PATIENTS UNDERGOING DEEP HYPOTHERMIC CIRCULATORY ARREST

• US 20100087719A1
• Filed: 10/06/2009
• Published: 04/08/2010
• Est. Priority Date: 10/06/2008
• Status: Active Grant

• Current Assignee: Edwards Lifesciences Corporation
• Original Assignee: Cas Medical Systems Incorporated (Edwards Lifesciences Corporation)
• Inventors: Benni, Paul
• Granted Patent: US 8,391,942 B2
• Time in Patent Office: Days
• US Class Current: 600/323
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue
• 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: G16H 40/63 for local operation
• CPC Class Codes: G16H 50/50 for simulation or modelling of medical disorders

Abstract

A method and apparatus for determining cerebral oxygen saturation in a subject is provided. The method comprises the steps of: a) determining tissue oxygen saturation values using a NIRS type oximeter over a period of time; b) modeling a rate of change in the tissue oxygen saturation values; and c) determining an amount of time until a predetermined tissue oxygen saturation value is reached using the modeling of the tissue oxygen saturation values.

Claims

1. A spectrophotometric examination device, comprising:

at least one sensor having a light signal transmitter operable to transmit at least one light signal, and at least one light signal detector operable to detect the light signal, which sensor is operable to produce at least one sensed signal corresponding to the detected light signal; and

a processor adapted to determine an oxygen saturation level in a subject'"'"'s tissue at a current point in time using the sensed signal, and which processor is adapted to model a rate of change in oxygen saturation level within the subject'"'"'s tissue, and determine an amount of time between the current point of time and a future point of time when the oxygen saturation level will reach a predetermined value.

2. The device of claim 1, wherein the processor is adapted to linearly model the rate of change in oxygen saturation level within the subject'"'"'s tissue.

3. The device of claim 1, wherein the processor is adapted to model the rate of change in oxygen saturation level within the subject'"'"'s tissue using a multi-component model.

4. The device of claim 1, wherein the processor is adapted to model the rate of change in oxygen saturation level within the subject'"'"'s tissue on a periodic basis, and update the amount of time between the current point of time and a future point of time in the event of change.

5. A method for determining cerebral oxygen saturation in a subject, comprising the steps of:

determining tissue oxygen saturation values using a NIRS type oximeter over a period of time;

modeling a rate of change in the tissue oxygen saturation values; and

determining an amount of time until a predetermined tissue oxygen saturation value is reached using the modeling of the tissue oxygen saturation values.

6. The method of claim 5, wherein the step of modeling the rate of change includes modeling the rate of change in oxygen saturation level within the subject'"'"'s tissue on a linear basis.

7. The method of claim 5, wherein the step of modeling the rate of change includes modeling the rate of change in oxygen saturation level within the subject'"'"'s tissue on a multi-component basis.

8. The method of claim 5, wherein the step of modeling the rate of change in oxygen saturation level within the subject'"'"'s tissue is performed on a periodic basis, and includes updating the amount of time until the predetermined tissue oxygen saturation value is reached.