METHOD AND DEVICE FOR MEASURING PARAMETERS OF CARDIAC FUNCTION
First Claim
1. A device useful to determine central venous pressure in a patient comprising:
- at least one light source adapted to emit light in the 400 nm to 1000 nm wavelength range;
an array of adjacent photodetectors adapted to sequentially receive light emitted by the light source and translate said light into a recordable output wherein said light is reflected from or transmitted through tissue of the patient, wherein the photodetectors are adjacent along a length of about 1.5 to 10 cm, andat least one probe which facilitates delivery of light from the light source to an external tissue site on the patient in the proximity of the jugular vein and receipt of light reflected from or transmitted through said patient site by the photodetectors.
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Accused Products
Abstract
A device for non-invasively measuring at least one parameter 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; at least one photodetector adapted to receive light emitted by the light source and generate an output based on the received light, wherein said light is reflected from or transmitted through tissue of the patient, the output of said photodetector being correlated with a parameter of the blood vessel; and at least one probe for facilitating delivery of light from the light source to an external tissue site on the patient in the proximity of the cardiac blood vessel and receipt of light by the photodetector. A system and methods of monitoring/measuring cardiac parameters utilizing the device and/or system are also provided.
66 Citations
13 Claims
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1. A device useful to determine central venous pressure in a patient comprising:
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at least one light source adapted to emit light in the 400 nm to 1000 nm wavelength range; an array of adjacent photodetectors adapted to sequentially receive light emitted by the light source and translate said light into a recordable output wherein said light is reflected from or transmitted through tissue of the patient, wherein the photodetectors are adjacent along a length of about 1.5 to 10 cm, and at least one probe which facilitates delivery of light from the light source to an external tissue site on the patient in the proximity of the jugular vein and receipt of light reflected from or transmitted through said patient site by the photodetectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining central venous pressure in a patient comprising:
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directing a beam of light having a wavelength in the range of 400 nm to 1000 nm at a series of external tissue sites on the patient'"'"'s neck along the internal or external jugular vein starting from a reference point having a known distance from the right atrium; detecting light reflected from or transmitted through each tissue site with a photodetector; translating the detected light into an output signal against time using a signal-processing device in communication with the photodetector to determine the highest position along the vein to yield a signal; and determining the vertical distance from the highest position to the reference point and calculating the central venous pressure based on this distance. - View Dependent Claims (10, 11, 12, 13)
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Specification