Method for measurement of systolic and diastolic time intervals

• US 20030216653A1
• Filed: 04/08/2003
• Published: 11/20/2003
• Est. Priority Date: 04/08/2002
• Status: Active Grant

• Current Assignee: Medwave, Inc.
• Original Assignee: Medwave, Inc.
• Inventors: OʼMalley, Timothy J., Poliac, Liviu C., Poliac, Marius O.
• Granted Patent: US 6,986,741 B2
• Time in Patent Office: Days
• US Class Current: 600/500
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

Abstract

A method and apparatus for determining cardiac time intervals that can measure physiological data noninvasively. Arterial pulse values are measured either invasively or noninvasively, from which left ventricular waveform data is generated. Systolic and diastolic time intervals are derived based on the left ventricular waveform data.

Claims

2-1. The method of claim 1 wherein the arterial pulse values are measured noninvasively.

11. A method of determining cardiac time intervals of a patient, the method comprising:

measuring arterial pulse values; and

generating left ventricular waveform data based on the arterial pulse values.

12. The method of claim 11 and further comprising:

identifying main cardiac events based on the left ventricular waveform data; and

deriving systolic and diastolic time intervals based on the main cardiac events.

13. The method of claim 11 wherein the arterial pulse values are based on arterial pulse blood pressure values.

14. An apparatus for determining cardiac time intervals, the apparatus comprising:

means for generating arterial pulse waveform data derived from a patient;

means for generating left ventricular waveform data from the arterial pulse waveform data;

means for identifying main cardiac events based upon the left ventricular waveform data; and

means for deriving systolic and diastolic time intervals based upon the main cardiac events.

15. The apparatus in claim 14 wherein the arterial pressure measurement device is a noninvasive blood pressure measurement device.

16. The apparatus of claim 14 wherein the arterial pressure measurement device is an invasive arterial line.

17. The apparatus of claim 14 wherein the means for identifying main cardiac events further comprises:

a computer which derives the main cardiac events from left ventricular pressure waveform data.