Techniques for obtaining information associated with an individual's blood pressure including specifically a stat mode technique

• US 4,699,152 A
• Filed: 11/13/1986
• Issued: 10/13/1987
• Est. Priority Date: 12/21/1984
• Status: Expired due to Fees

• Current Assignee: Baxter Travenol Laboratories Incorporated (Baxter International Inc.)
• Original Assignee: Baxter Travenol Laboratories Incorporated (Baxter International Inc.)
• Inventors: Link, William T.
• Primary Examiner(s): Recla, Henry J.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/930,242
• Time in Patent Office: 334 Days
• Field of Search: 128/672, 128/677, 128/680-683, 128/687-688
• US Class Current: 600/494
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives

Abstract

Techniques for determining different parameters associated with an individual'"'"'s blood pressure in a non-invasive manner are disclosed herein. These techniques include (1) generating a blood pressure waveform corresponding to the individual'"'"'s actual waveform, whereby the mean pressure of the individual can be readily calculated, (2) generating a transformation curve unique to the patient from his diastolic and systolic pressures and his cuff pulses (3) successively monitoring certain parameters of the patient'"'"'s blood pressure including his systolic and diastolic pressures over closely spaced intervals of time without having to subject the patient to cuff pressures much greater than his diastolic pressure, other than initially or not at all utilizing what is referred to as a stat mode, and (4) measuring a patient'"'"'s diastolic and systolic blood pressures at any given instance without ever having to subject the patient to cuff pressures much greater than his diastolic pressure.

Claims

1. A non-invasive method of approximating a specific parameter associated with the actual blood pressure pulse in a particular artery of a given mammal, which specific parameter is the blood pressure constant K, said method comprising the steps of:

(a) by non-invasive means, determining the diastolic and systolic pressure points D and S, respectively, of said actual blood pressure pulse;

(b) by non-invasive means, providing a waveform which approximates said actual pulse;

(c) finding the means value M of said waveform; and

(d) determining the blood pressure constant (K) of said mammal directly from said diastolic and systolic pressure points and said mean values by solving the equation ##EQU4##

2. A non-invasive method of approximating the mean value M associated with the actual blood pressure pulse in a particular artery of a given mammal, said method comprising the steps of:

(a) providing a waveform which approximates said actual pulse; and

(b) integrating said waveform and solving for the equation ##EQU5## where M is said mean value, T is the duration in time of said waveform and P is the waveforms'"'"' amplitude in pressure.

3. A non-invasive apparatus for approximating a specific parameter associated with the actual blood pulse in a particular artery of a given mammal, which specific parameter is the blood pressure constant K, said apparatus comprising:

(a) non-invasive means for determining the diastolic and systolic pressure points D and S, respectively, of said actual blood pressure pulse;

(b) non-invasive means for providing a waveform which approximates said actual pulse;

(c) means for finding the mean value M of said waveform; and

(d) determining the blood pressure constant of said mammal directly from said diastolic and systolic pressure points and said mean value by solving the equation ##EQU6##

4. A non-invasive apparatus for approximating a specific parameter associated with the actual blood pressure pulse in a particular artery of a given mammal, which parameter is the mean value M, said apparatus comprising:

(a) non-invasive means for providing a waveform which approximetes said actual pulse;

(b) means for determining the mean value under said waveform by integrating said waveform and solving for the equation ##EQU7## where M is said mean value, T is the duration in time of the waveform and P is the waveforms'"'"' amplitude in pressure.