Device for determining a characteristic point in the cardiac cycle

• US 20040039288A1
• Filed: 04/07/2003
• Published: 02/26/2004
• Est. Priority Date: 12/22/1995
• Status: Active Grant

• Current Assignee: Arrow International, LLC (Teleflex Incorporated)
• Original Assignee: Arrow International Investment Corporation (Teleflex Incorporated)
• Inventors: Schreuder, Johannes Jacobus, Hoeksel, Sebastiaan Adrianus Alphonsus Petrus, Jansen, Josef Reinier Cornelus
• Granted Patent: US 6,887,206 B2
• Time in Patent Office: Days
• US Class Current: 600/481
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/026 Measuring blood flow A61B3/1233, A61B3/1241 take precedence
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 60/139 inside the aorta, e.g. intra-aortic balloon pumps
• CPC Class Codes: A61M 60/295 Balloon pumps for circulatory assistance
• CPC Class Codes: Y10S 128/90 Blood pressure recorder

Abstract

Device for determining a characteristic point in the cardiac cycle, which device comprises means for calculating the curve of the blood flow rate D(t) in the aorta from the curve of the arterial blood pressure signal P(t) and determining from the curve of the blood flow rate D(t) in each cardiac cycle the time at which the incisura point lies. The device can be used for activating an intra-aortal balloon pump (IABP).

Claims

1. Device for determining a characteristic point in the cardiac cycle, characterized in that the device comprises means for calculating the curve of the blood flow rate D(t) in the aorta from the curve of the arterial blood pressure signal P(t) and determining from the curve of the blood flow rate D(t) in each cardiac cycle the time at which the incisura point lies.

2. Device according to claim 1, characterized in that the means are formed by a calculating device, loaded with a calculation program for calculating the blood flow rate D(t) from the curve of the arterial blood pressure signal P(t).

3. Device according to claim 1 or 2, characterized in that the device has means for delivering a signal at the moment when the incisura point is reached.

4. Device according to one of claims 1-3, characterized in that the incisura point is determined from the occurrence of the first local minimum in the curve of the blood flow rate D(t) after the beginning of the ejection phase.

5. Device according to claim 4, characterized in that the occurrence of the first local minimum is also subject to the condition that the blood flow rate lies below a threshold value Dd.

6. Device according to claim 5, characterized in that Dd is equal to 10% of the value which the blood flow rate has while the blood flow rate from the left ventricle has reached its maximum value.

7. Device according to claim 6, characterized in that Dd=0.

8. Device according to one of claims 1-3, characterized in that the incisura point is determined at the time that D(t)=0 after the beginning of the ejection phase.

9. Device according to one of claims 1-8, characterized in that the device has a filter for filtering out the high-frequency noise on the arterial blood pressure signal P(t).