Method and system for the determination of blood characteristics

• US 20040171949A1
• Filed: 01/21/2004
• Published: 09/02/2004
• Est. Priority Date: 01/22/2003
• Status: Active Grant

• Current Assignee: Uscom Ltd.
• Original Assignee: Uscom Ltd.
• Inventors: Phillips, Robert Allan
• Granted Patent: US 7,789,835 B2
• Time in Patent Office: Days
• US Class Current: 600/508
• CPC Class Codes: A61B 5/029 Measuring or recording blood output from the heart, e.g. minute volume A61B8/065 takes precedence
• CPC Class Codes: A61B 5/1075 for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer A61B8/0858 takes precedence
• CPC Class Codes: A61B 8/065 to determine blood output from the heart in general A61B5/029
• CPC Class Codes: A61B 8/08 Detecting organic movements or changes, e.g. tumours, cysts, swellings A61B8/02 - A61B8/06 take precedence

Abstract

A method of determining the cardiac output of a patient, the method comprising the steps of: (a) measuring the patients height; (b) measuring the velocity time integral or stroke distance of blood flowing from the heart of the patient, (c) utilising the two measurements in step (a) and (b) to determine the cardiac output of the patient.

Claims

1. A method of determining the cardiac output of a patient, the method comprising the steps of:

(a) measuring the patients height;

(b) measuring the velocity time integral or stroke distance of blood flowing from the heat of the patient; and

(c) utilising the two measurement in step (a) and step (b) to determine the cardiac output of the patient.

2. A method as claimed in claim 1 further comprising the step of measuring the correlation between the patient'"'"'s height and cross sectional area of a cardiac valve of a population of individuals and utilising the correlation in step (c) to determine the cardiac output of the patient.

3. A method as claimed in claim 2 wherein said population is selected having similar body characteristics to said patient.

4. A method as claimed in claim 1 wherein said method is utilised to determine the output from either the aortic annular or the pulmonary annular.

5. A method as claimed in claim 1 wherein said step of utilising comprises utilising the formula substantially of the form:

aortic annular diameter=0.010×

height (cms)+0.25 cm

to determine the diameter of the aortic annular and then determining a cross sectional.

6. A method as claimed in claim 1 wherein said step of utilising comprises utilising the formula substantially of the form:

aortic annular diameter=0.010×

height (cms)+0.25 cm

to determine the diameter of the aortic annular and then determining a cross sectional area.

7. A method as claimed in claim 1 wherein said step of utilising comprises utilising the formula substantially of the form:

pulmonary annular diameter=0.0106×

height (cms)+0.265 cm

to determine the diameter of the pulmonary valve and then determining a cross sectional area.

8. A method of determining the cardiac output of a patient substantially as hereinbefore described with reference to the accompanying drawings.