Apparatus and method for noninvasive measurement of peripheral pressure pulse compliance and systolic time intervals

• US 5,497,778 A
• Filed: 06/30/1993
• Issued: 03/12/1996
• Est. Priority Date: 06/30/1993
• Status: Expired due to Fees

• Current Assignee: Edward H. Hon
• Original Assignee: Edward H. Hon
• Inventors: Hon, Edward H.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): SCHAETZLE, KENNEDY
• Application Number:
  US08/085,547
• Time in Patent Office: 986 Days
• Field of Search: 128/691, 128/700, 128/713, 128/670, 128/672, 128/689, 128/696, 128/748, 607/23
• US Class Current: 600/485
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/02028 Determining haemodynamic parameters not otherwise provided for, e.g. cardiac contractility or left ventricular ejection fraction
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/4356 Assessing uterine contractions A61B5/033 takes precedence

Abstract

Systolic time intervals provide a basis for the determination of total electromechanical systole and offer a physiologic approach to cardiovascular assessment. In addition, examination of the pulse wave contour changes with advancing age and hypertension suggests that these data may be useful in assessing the vascular compliance and peripheral resistance of a subject. Noninvasively obtained peripheral systolic time intervals in normal and pathologic conditions and the automated measurement and continuous plotting of several parameters, including heart rate, pulse wave arrival time, rapid ejection time, peripheral pulse wave contour, and cutaneous pressure pulse are used in assessing the subject.

Claims

1. Apparatus for measuring compliance of the arteries of a patient comprising:

means for measuring the cutaneous pressure pulse wave of the cutaneous tissue overlying a finger tip;

means for electronically recording the cutaneous pressure pulse wave;

means for measuring the ECG wave;

means for electronically recording the ECG wave;

means for determining the R-wave of the ECG wave;

means for measuring the elapsed time from the peak of the R-wave to the time of the first up slope of the cutaneous pressure pulse wave;

means for measuring the time interval from the up slope of the cutaneous pressure pulse wave to the peak of the cutaneous pressure pulse wave; and

means for displaying said elapsed time and said time interval measurements.

2. Apparatus for measuring compliance of the arteries of a patient consisting of:

a noninvasive pressure transducer for measuring the cutaneous pressure pulse wave of a finger;

means for electronically recording the cutaneous pressure pulse wave;

means for measuring the ECG wave;

means for electronically recording the ECG wave; and

means for measuring the duration of the up slope of the cutaneous pressure pulse wave, said duration being measured from the onset to the peak of said cutaneous pressure pulse wave.

3. The method of determining the compliance of the arteries of a patient comprising the steps of measuring the cutaneous pressure pulse wave of a finger;

electronically recording the cutaneous pressure pulse wave;

measuring the ECG wave;

electronically recording the ECG wave;

determining the R-wave of the ECG wave;

measuring the elapsed time form the peak of the R-wave to the time of the first up slope of the cutaneous pressure pulse wave;

measuring the time interval form the up slope of the cutaneous pressure pulse wave to the peak of the cutaneous pressure pulse wave; and

displaying said time measurements.

4. The method of determining the compliance of the arteries of a patient comprising the steps of measuring the cutaneous pressure pulse wave of a finger;

electronically recording the cutaneous pressure pulse wave;

measuring the ECG wave;

electronically recording the ECG wave;

determining the R-wave of the ECG wave;

measuring the time interval from the up slope of the cutaneous pressure pulse wave to the peak of the cutaneous pressure pulse wave; and

displaying said time measurement.