Waveform information obtaining techniques associated with an individual's blood pressure

• US 4,651,747 A
• Filed: 05/28/1986
• Issued: 03/24/1987
• Est. Priority Date: 06/20/1984
• 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): Sykes, Angela D.
• Application Number:
  US06/868,314
• Time in Patent Office: 300 Days
• Field of Search: 128/672, 128/677-683
• US Class Current: 600/490
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence

Abstract

Techniques for determining different parameters associated with an individual'"'"'s blood pressure in a non-invasive manner are disclosed herein. These techniques include generating a blood pressure waveform corresponding to the individual'"'"'s actual waveform whereby the mean blood pressure of the individual can be readily calculated. This is accomplished by either using a specifically selected cuff pressure or by ramping the cuff pressure as would be done in taking blood pressure.

Claims

1. A non-invasive method of providing a waveform approximating the actual blood pressure pulse in a particular artery of a given mammal over a specific period of time during which a number of such pulses successively occur, each having diastolic and systolic pressure points, one edge defining a systolic rise and a second edge including a diastolic decline, said method comprising the steps of:

(a) determining the diastolic and systolic blood pressures and the arterial curve of said mammal;

(b) placing a blood pressure cuff around said particular artery;

(c) pressurizing the cuff to a fixed pressure of a predetermined value and generating at least one or a series of cuff pulses at said fixed cuff pressure of a predetermined value from the blood pressure pulses in said artery; and

(d) using said at least one or a series of cuff pulses, and the mammal'"'"'s diastolic and systolic blood pressures and its arterial curve to generate a waveform which approximates the mammal'"'"'s actual blood pressure waveform.

2. A method according to claim 1 wherein said cuff is ramped up and/or down in pressure to generate different cuff pulses at different cuff pressure values and wherein said waveform is responsive to each of said different cuff pulses.

3. A method according to claim 1 including the step of displaying said cuff pulse or pulses along with indicia indicating that the peak to peak amplitude of these pulses extends between specific pressure values corresponding to the mammal'"'"'s diastolic and systolic pressures.

4. A method according to claim 3 wherein said cuff pulse or pulses are displayed on an oscilloscope.

5. A method according to claim 3 wherein only said cuff pulse or pulses, diastolic and systolic pressures and said arterial curve are used to generate said waveform.

6. A method according to claim 1 where said fixed cuff pressure is about zero and 60 Torr.

7. A method according to claim 6 wherein said cuff pressure is about 40 Torr.

8. A non-invasive apparatus providing a waveform approximating the actual blood pressure pulse in a particular artery of a given mammal over a specific period of time during which a number of such pulses successively occur, each having diastolic and systolic pressure points, one edge defining a systolic rise and a second edge including a diastolic decline, said apparatus comprising:

(a) means for determining the diastolic and systolic blood pressures and the arterial curve of said mammal;

(b) a blood pressure cuff for placement around said particular artery;

(c) means for pressurizing said cuff and cooperating with the pressurized cuff for generating at least one of a series of cuff pulses at a fixed cuff pressure of a predetermined value from the blood pressure pulses in said artery; and

(d) means responsive to said at least one or a series of cuff pulses, and the mammal'"'"'s diastolic and systolic blood pressures and its arterial curve for generating a waveform which approximates the mammal'"'"'s actual blood pressure waveform.

9. An apparatus according to claim 8 including means for ramping up and/or down the pressure in said cuff to generate different cuff pulses at different cuff pressure values and wherein said waveform is responsive to each of said different cuff pulses.

10. An apparatus according to claim 8 including means for displaying said cuff pulse or pulses along with indicia indicating that the peak to peak amplitude of these pulses extends between specific pressure values corresponding to the mammal'"'"'s diastolic and systolic pressures.

11. An apparatus according to claim 8 wherein said fixed cuff pressure is between zero and about 60 Torr.

12. A method according to claim 11 wherein said cuff pressure is about 40 Torr.

13. A non-invasive method of providing a waveform approximating the actual blood pressure pulse in a particular artery of a given mammal over a specific period of time during which a number of such pulses successively occur, said method comprising the steps of:

(a) determining the arterial curve of said mammal;

(b) placing a blood pressure cuff type member adjacent said particular artery;

(c) pressurizing the cuff-type member to a fixed cuff pressure of a predetermined value and generating at least one or a series of cuff pulses at said fixed cuff pressure of a predetermined value from the blood pressure pulses in said artery; and

(d) using said at least one or a series of cuff pulses, and the mammal'"'"'s arterial curve to generate a waveform which approximates the mammal'"'"'s actual blood pressure waveform.

14. A method according to claim 13 wherein said fixed cuff pressure is between about zero and 60 torr.

15. A method according to claim 14 wherein said cuff pressure is about 40 torr.

16. A non-invasive apparatus providing a waveform approximating the actual blood pressure pulse in a particular artery of a given mammal over a specific period of time during which a number of such pulses successively occur, said apparatus comprising:

(a) means for determining the arterial curve of said mammal;

(b) a blood pressure cuff for placement adjacent said particular artery;

(c) means for pressurizing said cuff and cooperating with the pressurized cuff for generating at least one or a series of cuff pulses at a fixed cuff pressure of a predetermined value from the blood pressure pulses in said artery; and

(d) means responsive to said at least one or a series of cuff pulses, and the mammal'"'"'s arterial curve for generating a waveform which approximates the mammal'"'"'s actual blood pressure waveform.

17. An apparatus according to claim 16 wherein said fixed cuff pressure is between about zero and 60 torr.

18. A method according to claim 17 wherein said cuff pressure is about 40 torr.

19. A non-invasive method of providing a waveform which is a second order approximation of the actual blood pressure pulse in a particular artery of a given mammal over a specific period of time during which a number of such actual blood pressure pulses successively occur, said method comprising the steps of:

(a) determining the arterial curve of said mammal;

(b) placing a blood pressure cuff type member adjacent said particular artery;

(c) pressurizing the cuff type member to a fixed cuff pressure of a predetermined value and form the blood pressure pulses in said artery generating at least one or a series of cuff pulses at said fixed cuff pressure of a predetermined value, said cuff pulses serving as a first order approximation of said actual blood pressure pulses, and

(d) using said at least one or a series of cuff pulses, and the mammal'"'"'s arterial curve to generate a waveform which is a second order approximation of the mammal'"'"'s actual blood pressure waveform.

20. A non-invasive apparatus providing a waveform which is a second order approximation of the actual blood pressure pulse in a particular artery of a given mammal over a specific period of time during which a number of such actual blood pressure pulses successively occur, said apparatus comprising:

(a) means for determining the arterial curve of said mammal;

(b) a blood pressure cuff type member for placement adjacent said particular artery;

(c) means for pressurizing said cuff type member and cooperating with the pressurized cuff for generating at least one or a series of cuff pulses at a fixed cuff pressure of a predetermined value from the blood pressure pulses in said artery, said cuff pulses serving as a first order approximation of said actual blood pressure; and

(d) means responsive to said at least one or a series of cuff pulses, and the mammal'"'"'s arterial curve for generating a waveform which is a second order approximation of the mammal'"'"'s actual blood pressure waveform.