Detection of blood-vessel wall artifacts
First Claim
Patent Images
1. A method comprising:
- projecting a light from a catheter into a blood vessel having a blood-vessel wall;
measuring a first intensity of a first wavelength associated with the light;
measuring a second intensity of a second wavelength associated with the light;
calculating a ratio of the first intensity and the second intensity;
comparing the ratio with a threshold; and
based on the comparing, determining a proximity of the catheter to the blood-vessel wall;
wherein the first wavelength is below approximately 580 nm and the second wavelength is above approximately 720 nm.
2 Assignments
0 Petitions
Accused Products
Abstract
The present application concerns detecting catheter proximity to a blood-vessel wall and blood-vessel wall artifacts associated therewith. In one embodiment, a light source, in a catheter, can be used to project light into the blood vessel. An intensity associated with at least one light wavelength that interacted with blood can be measured. Based on the measured intensity, a determination can be made regarding blood-vessel wall artifacts due to the catheter tip proximity to a blood-vessel wall. Feedback can be provided to the clinician in order to assist the clinician in adjusting the catheter to optimize signal quality and minimize artifacts due to the blood-vessel wall.
-
Citations
17 Claims
-
1. A method comprising:
-
projecting a light from a catheter into a blood vessel having a blood-vessel wall; measuring a first intensity of a first wavelength associated with the light; measuring a second intensity of a second wavelength associated with the light; calculating a ratio of the first intensity and the second intensity; comparing the ratio with a threshold; and based on the comparing, determining a proximity of the catheter to the blood-vessel wall; wherein the first wavelength is below approximately 580 nm and the second wavelength is above approximately 720 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An apparatus comprising:
-
a catheter including a transmit optical fiber and a receive optical fiber; a light source coupled to the transmit optical fiber for transmitting a light into a blood vessel having a blood and a blood-vessel wall; one or more photodetectors coupled to the receive optical fiber for receiving the light after the light interacts with the blood; and a controller coupled to the one or more photodetectors and configured to; measure a first intensity of a first wavelength associated with the light; measure a second intensity of a second wavelength associated with the light; calculate a ratio of the first intensity and the second intensity; compare the ratio with a threshold; and based on comparing, determine a proximity of the catheter to the blood-vessel wall; wherein the first wavelength is below approximately 580 nm and the second wavelength is above approximately 720 nm. - View Dependent Claims (14, 15, 16, 17)
-
Specification