Method and system for measuring rate of occurrence of a physiological parameter

• US 4,356,825 A
• Filed: 03/11/1980
• Issued: 11/02/1982
• Est. Priority Date: 08/21/1978
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Veth, George J.
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Jaworski, Francis J.
• Application Number:
  US06/129,213
• Time in Patent Office: 966 Days
• Field of Search: 128/670-671, 128/630, 128/687-690, 128/700, 128/702-706, 128/721-724, 364/415, 364/417, 364/701-702, 364/737, 364/554
• US Class Current: 600/301
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: G01K 13/20 Clinical contact thermometers for use with humans or animals

Abstract

A method system for measuring the rate of occurrence of physiological parameters, such as temperature, pulse rate and respiration rate. A method, implemented by a digital processor associated with an electronic measuring system, provides accurate measurements in a short period of time, which measurements are then displayed to the system operator. Automatic indicator signals or alarm signals are produced whenever data is determined to be invalid. The system is entirely self-contained and, upon completion of a measuring cycle, actuation of the appropriate function key, will visually display the valid data to the operator.

Claims

1. A method for measuring a physiological parameter of a patient in a rapid manner by converting successive measurements of the physiological parameter into a final measurement value thereof, comprising the steps of:

(a) detecting successive occurrences of the physiological parameter;

(b) producing, in response to said successive occurrences of said physiological parameter, data points representing values of said physiological parameter;

(c) comparing each of said data points with a predetermined range to determine those data points having a value falling within said predetermined range, and determining the number of said data points having a value falling within said predetermined range;

(d) computing an average of all said data points having a value falling within said pre-determined range;

(e) determining if said computed average falls outside of said predetermined tolerance limits, and if so, substituting said computed average as a new average; and

(f) determining if said computed average falls within said predetermined tolerance limits, and if so, comparing the determined number of said data points having a value within said predetermined range with a pre-selected number, declaring the computed average to be an invalid calculation if the determined number of date points is less than said pre-selected number, and declaring the computed average to be a valid calculation if the determined number of date points is greater than said pre-selected number;

whereby to rapidly obtain for display a valid final measurement value of the physiological parameter from said date points.

2. The method of claim 1 wherein the step of detecting successive occurrences of the physiological parameter comprises the step of detecting the pulse beat of the patient.

3. The method of claim 2 further including the step of producing an indication that the computed average is an invalid calculation.

4. The method of claim 2 further including the step of displaying the computed average which has been declared a valid calculation.

5. The method of claim 1 wherein the step of detecting successive occurrences of the physiological parameter comprises the step of detecting the occurrence of a respiration of the patient.

6. The method of claim 5 further including the step of producing an indication that the computed average is an invalid calculation.

7. The method of claim 5 further including the step of displaying the computed average which has been declared a valid calculation.

8. A system for measuring a physiological parameter of a patient in a rapid manner by converting successive measurements of the physiological parameter into a final measurement value thereof, comprising:

means for detecting successive occurrences of the physiological parameter;

means for producing, in response to said successive occurrences of said physiological parameter, date points representing values of said physiological parameter;

means for comparing each of said data points with a predetermined range to determine those data points having a value falling within said predetermined range, and determining the number of said data points having a value falling within said predetermined range;

means for computing an average of all said date points having a value falling within said predetermined range;

means for determining whether said computed average falls within predetermined tolerance limits;

means responsive to said computed average falling outside said predetermined tolerance limits for substituting said computed average as a new average; and

means responsive to said computed average falling within said predetermined tolerance limits for comparing the determined number of said data points having a value within said predetermined range with a preselected number, and for declaring the computed average to be an invalid calculation if the determined number of data points is less than said preselected number, and for declaring the computed average to be a valid calculation if the determined number of data points is greater than said preselected number;

whereby to rapidly obtain for display a valid final measurement value of the physiological parameter from said data points.

9. The system of claim 8, wherein said means for detecting successive occurrences of the physiological parameter comprises means for detecting the pulse beat of the patient.

10. The system of claim 9, further including means for producing an indication that the computed average is an invalid calculation.

11. The system of claim 9, further including means for displaying the computed average which has been declared a valid calculation.

12. The system of claim 8, wherein said means for detecting successive occurrences of the physiological parameter comprises means for detecting the occurrence of a respiration of the patient.

13. The system of claim 12, further including means for producing an indication that the computed average is an invalid calculation.

14. The system of claim 12, further including means for displaying the computed average which has been declared a valid calculation.