Apparatus for monitoring physiological parameters

• US 4,966,155 A
• Filed: 11/17/1989
• Issued: 10/30/1990
• Est. Priority Date: 01/31/1985
• Status: Expired due to Fees

• Current Assignee: University of Strathclyde
• Original Assignee: University of Strathclyde
• Inventors: Jackson, John
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): SCHAETZLE, KENNEDY
• Application Number:
  US07/437,323
• Time in Patent Office: 347 Days
• Field of Search: 128/670, 128/671, 128/695, 128/696, 128/700, 128/716, 128/721, 128/774, 128/782
• US Class Current: 600/484
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/222 combined with detection or measurement of physiological parameters, e.g. heart rate

Abstract

An apparatus is disclosed for monitoring physiological parameters comprising a harness adapted to be worn by a human being and electrical circuitry connected to the harness for calculating physiological parameters in accordance with predetermined algorithms. The harness includes a band which extends around a trunk portion of the human being. The band comprises an inelastic portion and an elastic portion. The elastic portion incorporates an electro-conductive elastomeric means which has a resistance value which changes as a function of elongation of the elastic portion. The electrical circuitry connected to the elastomeric element calculates and displays various physiological parameters.

Claims

1. Apparatus for monitoring physiological parameters in human beings, said apparatus comprising a harness adapted to be worn on the upper body of a human being and incorporating a single circumferential band for extending around the truck portion between the thorax and the abdomen of said upper body, said band comprising a substantially inelastic portion circumferentially conjoined with an elastic portion, said elastic portion incorporating an electroconductive elastomeric means having an electrical resistance value which changes as a function of elongation of said elastic portion, and analyzing means electrically connected to said elastomeric means for analyzing changes in said resistance value arising from changes in volume of said trunk portion and establishing physiological parameters therefrom in accordance with predetermined algorithms, wherein said analyzing means comprises data entry means for entering personal characteristics of the human being whose physiological parameters are being monitored, such characteristics including sex gender and quantitative data of height and weight, and the analyzing means further comprises first signal conditioning means for conditioning the electrical signal waveform received form the elastomeric means to establish a breathing waveform, said first signal conditioning means comprising means for analogue smoothing of the signal by elimination of its high frequency content.

2. Apparatus as claimed in claim 1, wherein the analyzing means further comprises second signal conditioning means for effecting a frequency analysis of the signal received from the elastomeric means in order to identify, after removal of noise components, its three principal frequencies, frequency comparator means coupled to receive the signals generated by the first and second signal conditioning means for identifying the breathing rate frequency component provided by the second signal conditioning means by comparison with the breathing waveform provided by the first signal conditioning means, said frequency comparator means including substraction means to remove the matched breathing rate signal from the signal provided by the second signal conditioning means, and amplitude-discrimination gating means to which the output of the subtraction means is delivered whereby the remaining two frequency components of the signal from the subtraction means are separated on an amplitude discrimination basis.

3. Apparatus as claimed in claim 1, wherein the analyzing means comprises a first calculation means for evaluating body surface area of the human being according to a first predetermined algorithm;

second calculation means for evaluating calories consumed by the human being in unit time on the basis of a second predetermined algorithm; and

third calculation means for evaluating a fitness factor according to a third predetermined algorithm.

4. Apparatus as claimed in claim 2, wherein the analyzing means comprises a first calculation means for evaluating body surface area of the human being according to a first predetermined algorithm;

second calculation means for evaluating calories consumed by the human being in unit time on the basis of a second predetermined algorithm; and

third calculation means for evaluating a fitness factor according to a third predetermined algorithm.

5. Apparatus as claimed in claim 4, wherein the first algorithm is a function of height and weight of the human being and is in accordance with a known formula, the second predetermined algorithm is a function of the peak value of the breathing rate signal identified by the first signal conditioning means, the sex gender of the human being and the standard respiratory quotient, and the third predetermined algorithm is a function of the basal methabolic quotient derived by the analyzing means in the absence of the human being effecting aerobic activity, the metabolic quotient derived by the analyzing means when the human being is undertaking aerobic activity, the recovery time established by the analyzing means following completion of aerobic activity for the breathing rate to return to its basal level, the recovery time for the heart rate to return to its basal level, and the total energy consumed over the activity period.