Method of and apparatus for determining the diastolic and systolic blood pressure of a patient

• US 4,712,563 A
• Filed: 05/28/1986
• Issued: 12/15/1987
• Est. Priority Date: 05/28/1986
• Status: Expired due to Fees

• Current Assignee: Baxter Travenol Laboratories Incorporated
• Original Assignee: Baxter Travenol Laboratories Incorporated
• Inventors: Link, William T.
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Jaworski, Francis J.
• Application Number:
  US06/868,400
• Time in Patent Office: 566 Days
• Field of Search: 128/680-683, 364/417
• US Class Current: 600/494
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives

Abstract

A technique is disclosed herein for obtaining the diastolic and systolic blood pressures of a particular patient by generating cuff pulses of the patient and using these cuff pulses as the only information relating to the blood pressure of the patient in order to determine the diastolic and systolic pressures.

Claims

1. A method of determining the diastolic and systolic blood pressures of a particular patient, comprising the steps of:

(a) placing blood pressure cuff means adjacent a particular artery of said patient;

(b) using means cooperating with said cuff means, pressurizing said cuff means to a number of different cuff pressure levels from a level below the anticipated diastolic pressure of the patient to a pressure above the patient'"'"'s anticipated systolic pressure and generating cuff pulses having peak to peak amplitude values corresponding to and dependent on said different cuff pressure levels; and

(c) electronically obtaining the diastolic and systolic pressures of said patient mathematically using said cuff pulses, said step of obtaining said diastolic and systolic pressures mathematically including the steps of;

(i) generating a curve corresponding to the peak to peak amplitude values of said cuff pulses as a function of said different cuff pressure levels,

(ii) differentiating said curve with respect to said different cuff pressure levels, said differentiated curve including a first peak point at a cuff pressure level equal to the diastolic pressure of said patient and a second peak point at a cuff pressure equal to the systolic pressure of said patient, and

(iii) from said differentiated curve, obtaining the patient'"'"'s diastolic and systolic pressures by identifying said first and second peak points and determining the cuff pressures at those points.

2. A method of determining the systolic blood pressure of a particular patient, comprising the steps of:

(a) placing blood pressure cuff means adjacent a particular artery of said patient;

(b) using means cooperating with said cuff means pressurizing said cuff means to a number of different cuff pressure levels form a level below the anticipated systolic pressure of the patient to a pressure above the patient'"'"'s anticipated systolic pressure and generating cuff pulses having peak to peak amplitude values corresponding to and dependent on said different cuff pressure levels; and

(c) electronically obtaining the systolic pressure of said patient mathematically using said cuff pulses, said step of obtaining said systolic pressure mathematically including the steps of;

(i) generating a curve corresponding to the peak to peak amplitude values of said cuff pulses as a function of said different cuff pressure levels,

(ii) differentiating said curve with respect to said different cuff pressure levels, said differentiated curve including a peak point at a cuff pressure level equal to the systolic pressure of said patient, and

(iii) from said differentiated curve, obtaining the patient'"'"'s systolic pressure by identifying said peak point and determining the cuff pressure levels at said point.

3. A method of determining the diastolic and systolic blood pressures of a particular patient, comprising the steps of:

(a) placing blood pressure cuff means adjacent a particular artery of said patient;

(b) using means cooperating with said cuff means, pressurizing said cuff means to a number of different cuff pressure levels form a level below the anticipated diastolic pressure of the patient to a pressure above the patient'"'"'s anticipated systolic pressure and generating cuff pulses having peak to peak amplitude values corresponding to and dependent on said different cuff pressure levels; and

(c) obtaining the diastolic and systolic pressures of said patient mathematically by

(i) generating a curve corresponding to the peak to peak amplitude values of said cuff pulses as a function of said different cuff pressure levels,

(ii) differentiating said curve with respect to said different cuff pressure levels, said differentiated curve including a first peak point at a cuff pressure level equal to the diastolic pressure of said patient and a second peak point at a cuff pressure equal to the systolic pressure of said patient, and

(iii) from said differentiated curve, obtaining the patient'"'"'s diastolic and systolic pressures by identifying said first and second peak points and determining the cuff pressure levels at said points.

4. An apparatus for determining the diastolic and systolic blood pressures of a particular patient, comprising:

(a) blood pressure cuff means positionable adjacent a particular artery of said patient;

(b) means cooperating with said cuff means for pressurizing said cuff means to a number of different cuff pressure levels form a level below the anticipated diastolic pressure of the patient to a pressure above the patient'"'"'s anticipated systolic pressure;

(c) means for generating cuff pulses having peak to peak amplitude values corresponding to and dependent on said different cuff pressure levels; and

(d) means of obtaining the diastolic and systolic pressures of said patient mathematically using said cuff pulses, said means for obtaining said diastolic and systolic pressures mathematically including

(i) means for generating a curve corresponding to the peak to peak amplitude values of said cuff pulses as a function of said different cuff pressure levels,

(ii) means for differentiating said curve with respect to said different cuff pressure levels, said differentiated curve including a first peak point at a cuff pressure level equal to the diastolic pressure of said patient and a second peak point at a cuff pressure equal to the systolic pressure of said patient, and

(iii) means responsive to said differentiated curve for obtaining the patient'"'"'s diastolic and systolic pressure by identifying said first and second peak points and determining the cuff pressure levels at said points.