Method and device for measuring parameters of cardiac function
First Claim
1. A device for non-invasively measuring at least one parameter of a cardiac blood vessel in a patient comprising:
- at least one light source that emits light in the 400 nm to 1000 nm wavelength range;
at least one photodetector adapted to receive light emitted by the light source, wherein said light is reflected from or transmitted through tissue of the patient, the output of said photodetector correlating with a parameter of the blood vessel; and
a probe which permits delivery of light from the light source to an external tissue site on the patient in the proximity of a cardiac blood vessel and permits transfer of light from said light source which is reflected from or transmitted through said patient site.
2 Assignments
0 Petitions
Accused Products
Abstract
A device for non-invasively measuring parameters of a cardiac blood vessel in a patient is provided. The device comprises at least one light source that emits light in the 400 nm to 1000 nm wavelength range and at least one photodetector adapted to receive light emitted by the light source, which light is reflected from or transmitted through tissue of the patient, the output of said photodetector correlating with a parameter of the blood vessel. The device also includes a probe which permits delivery of light from the light source to an external tissue site on the patient in the proximity of a cardiac blood vessel and permits the photodetector to receive light originating from the light source which has been reflected from or transmitted through tissue at the patient site.
24 Citations
10 Claims
-
1. A device for non-invasively measuring at least one parameter of a cardiac blood vessel in a patient comprising:
-
at least one light source that emits light in the 400 nm to 1000 nm wavelength range; at least one photodetector adapted to receive light emitted by the light source, wherein said light is reflected from or transmitted through tissue of the patient, the output of said photodetector correlating with a parameter of the blood vessel; and a probe which permits delivery of light from the light source to an external tissue site on the patient in the proximity of a cardiac blood vessel and permits transfer of light from said light source which is reflected from or transmitted through said patient site. - View Dependent Claims (2, 3, 4, 9, 10)
-
- 6. A method as defined in claim 5, comprising directing more than one beam of light at the same or different tissue site on a patient, each beam having a different wavelength in the range of 400 nm to 1000 nm.
-
8. A method for measuring the blood content of a chromophore in a patient comprising:
-
directing light having at least first and second selected wavelengths at an external tissue site on the patient that is in the proximity of a cardiac blood vessel, wherein said selected wavelengths are based on the absorption characteristics of the chromophore; detecting light reflected from the tissue or transmitted through the tissue at the selected wavelengths; and translating the detected light into an output signal against time to generate a waveform for each selected wavelength in order to determine the blood content of said chromophore.
-
Specification