Capillary refill time diagnostic apparatus and methods
First Claim
1. An apparatus for measuring capillary refill time comprising:
- at least one source for emitting first radiation characterized by a first wavelength in a range between about 500 nm and about 550 nm, wherein the first radiation is used to detect an amount of blood in a measurement region and wherein the first wavelength is absorbed by an amount of oxyhemoglobin substantially equally as much as the first wavelength is absorbed by the same amount of deoxyhemoglobin, and for emitting second radiation characterized by a second wavelength as a reference wavelength;
at least one detector for detecting the first radiation and the second radiation; and
a probe including a convex surface configured to be controllably applied against and released from a measurement region including a capillary bed, wherein the at least one source is configured to radiate the measurement region and the at least one detector is configured to detect the first radiation and the second radiation received from the measurement region.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for measuring capillary refill time has a measurement module containing at least two radiation sources and at least one detector configured to detect radiation from each source that interacts with and is received from a measurement region of a patient or subject. One radiation source may be characterized by a wavelength that is absorbed substantially equally by oxyhemoglobin and deoxyhemoglobin. The other radiation source may be substantially unaffected by the presence or absence of blood in the measurement region. The measurement module may be applied against a measurement region of a patient for a first time period, and the released from the measurement region for a second time period, and detected signals processed to quantitatively evaluate capillary refill time.
-
Citations
18 Claims
-
1. An apparatus for measuring capillary refill time comprising:
-
at least one source for emitting first radiation characterized by a first wavelength in a range between about 500 nm and about 550 nm, wherein the first radiation is used to detect an amount of blood in a measurement region and wherein the first wavelength is absorbed by an amount of oxyhemoglobin substantially equally as much as the first wavelength is absorbed by the same amount of deoxyhemoglobin, and for emitting second radiation characterized by a second wavelength as a reference wavelength; at least one detector for detecting the first radiation and the second radiation; and a probe including a convex surface configured to be controllably applied against and released from a measurement region including a capillary bed, wherein the at least one source is configured to radiate the measurement region and the at least one detector is configured to detect the first radiation and the second radiation received from the measurement region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification