Non-invasive medical monitor system

• US 5,590,650 A
• Filed: 11/16/1994
• Issued: 01/07/1997
• Est. Priority Date: 11/16/1994
• Status: Expired due to Fees

• Current Assignee: Raven, Inc.
• Original Assignee: Raven, Inc.
• Inventors: Genova, James J.
• Primary Examiner(s): Sykes, Angela D.
• Assistant Examiner(s): NASSER, ROBERT L
• Application Number:
  US08/345,065
• Time in Patent Office: 783 Days
• Field of Search: 128/670, 128/671, 128/721, 128/722, 128/774, 128/782, 128/630, 128/664-6, 128/660.02, 128/660.03, 128/696, 128/658.01, 128/736, 128/748, 128/633, 128/668
• US Class Current: 600/301
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/7257 using Fourier transforms

Abstract

An apparatus operable for monitoring physiological vital signs of a human body without physically contacting the body is disclosed. The apparatus includes a sensor operable to transform a movement and/or acoustical wave produced by the body into an electrical signal, a signal processor coupled to the sensor and operable to receive the electrical signal from the sensor and to process the electrical signal adaptively using wavelet correlator analysis. The signal processor provides an output signal indicative of the movement and/or acoustical wave producing the electrical signal. Typically, the apparatus can be used to monitor heart rate, respiration rate and related sounds, digestive system sounds as well as other physiological vital signs considered both essential and desirable for the evaluation of the health of a person.

Claims

1. An apparatus operable for monitoring physiological vital signs of a human body as indicated by a movement and/or acoustical wave produced by the body without physically contacting the body;

said apparatus comprising sensing means operable to transform a movement and/or acoustical wave produced by said body into an electrical signal;

signal processing means coupled to said sensing means and operable to receive said electrical signal from said sensing means and to process said electrical signal adaptively using wavelet correlator analysis;

said signal processing means having an output signal indicative of the movement and/or acoustical wave producing said electrical signal.

2. The apparatus as claimed in claim 1, further comprising display means and coupling means operable for coupling said display means to said signal processing means;

said display means operable for displaying said output signal in a form representative of the physiological vital sign being sensed from the movement and/or acoustical wave of the body generating said electrical signal.

3. The apparatus as claimed in claim 2, wherein said coupling means is a direct electrical connection.

4. The apparatus as claimed in claim 2, wherein said coupling means comprises transmitting means operable for establishing a coupling though an electromagnetic transmission.

5. The apparatus as claimed in claim 1, wherein said signal processing means comprises means for selectively processing data for preselected physiological vital signs.

6. The apparatus as claimed in claim 1, wherein said signal processing means is operable for being initialized for a body by utilizing said electrical signal to establish matched filters corresponding to preselected physiological vital signs.

7. The apparatus as claimed in claim 1, wherein said signal processing means comprises an initialization means operable for initializing said apparatus for a body;

said initialization means comprising bandpass filter means operable for selectively band passing signals within a predetermined frequency band;

coherent energy detector means operable for coherently detecting a predetermined signal;

lowpass filter means operable for selectively passing signals less than a predetermined frequency;

fast Fourier transform means operable for producing a fast Fourier transform of an input signal; and

analyzing means operable for determining the starting parameters for said signal processing means;

said analyzing means comprising in combination a frequency phase/power analyzer;

coherent integrator; and

signal estimating means operable for estimating physiological vital sign parameters and a master wavelet.

8. The apparatus as claimed in claim 1, wherein said signal processing means establishes data flow in which said electrical signal is used to establish a first signal corresponding to a first order time window;

said first signal is used for producing a second signal from a signal analyzer and a third signal from a wavelet correlator;

said second signal is used in a built in test of the system to produce a fourth signal;

said third and fourth signals are used to establish that a suitable signal is present in said electrical signal and to produce a fifth signal;

said fifth signal is used to modify a temporal filter, and a master wavelet filter, which are coupled together, and an output signal;

said temporal filter being coupled to receive said first signal and said master wavelet filter being coupled to said wavelet correlator.