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US 8,543,180 B2Granted
Method and apparatus for total hemoglobin measurement
AssigneeCovidien LP
InventorsKate Leeann Bechtel, Tobias Funk, Brian Patrick Wilfley, Joseph Anthony Heanue
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Abstract
The present invention pertains to a method and apparatus for total hemoglobin measurement. A modulated optical signal based on a digital code sequence is transmitted to human tissue. A temporal transfer characteristic is derived from the modulated optical signal. Total hemoglobin is determined based on the temporal transfer characteristic.
Claims16
A total hemoglobin measurement system for measuring total hemoglobin in human tissue comprising:
- a signal generator for generating a digital modulation signal representing a code sequence;
- an optical illumination source coupled to said signal generator for receiving said digital modulation signal and configured for transmitting a modulated optical signal along an optical transmission path to said human tissue in response to said digital modulation signal;
- a detector configured to be optically coupled to said human tissue for receiving said modulated optical signal after transmission through the optical transmission path through said human tissue;
- a processor coupled to said detector for deriving a temporal transfer characteristic for said optical signal received by said detector and for determining said total hemoglobin based on said temporal transfer characteristic;
- a second signal generator for generating a second digital modulation signal representing a second code sequence, wherein said second code sequence and said code sequence have the same ordering of code elements and begin at different code elements;
- and
- a second optical illumination source coupled to said second signal generator for receiving said second digital modulation signal and configured for transmitting a second modulated optical signal to said human tissue in response to said second digital modulation signal.
4 more elements
A method for measuring total hemoglobin in a human tissue comprising:
- generating a digital modulation signal associated with a code sequence;
- generating a modulated optical signal based on said digital modulation signal;
- transmitting said modulated optical signal to said human tissue;
- receiving a modified version of said modulated optical signal after transmission through said human tissue;
- deriving a temporal transfer characteristic for said modified version of said modulated optical signal;
- calculating said total hemoglobin based on said temporal transfer characteristic;
- delaying said code sequence to generate a second code sequence;
- generating a second digital modulation signal associated with said second code sequence;
- generating a second modulated optical signal based on said second digital modulation signal;
- transmitting said second modulated optical signal to said human tissue;
- receiving a second modified version of said second modulated optical signal after transmission through said human tissue;
- and
- deriving a second temporal transfer characteristic for said second modified version of said second modulated optical signal.
10 more elements
A total hemoglobin measurement system for measuring total hemoglobin in human tissue comprising:
- means for generating a digital modulation signal associated with a code sequence;
- means for generating a modulated optical signal based on said digital modulation signal;
- means for transmitting said modulated optical signal to said human tissue;
- means for receiving a modified version of said modulated optical signal after transmission through said human tissue;
- means for deriving a temporal transfer characteristic for said modified version of said modulated optical signal;
- means for calculating said total hemoglobin based on said temporal transfer characteristic;
- means for delaying said code sequence to generate a second code sequence;
- means for generating a second digital modulation signal associated with said second code sequence;
- means for generating a second modulated optical signal based on said second digital modulation signal;
- means for transmitting said second modulated optical signal to said human tissue;
- means for receiving a second modified version of said second modulated optical signal after transmission through said human tissue;
- and
- means for deriving a second temporal transfer characteristic for said second modified version of said second modulated optical signal.
10 more elements
Dependencies are inferred from the claim text.