Method and apparatus for tissue measurement position tracking and depth adjustment
First Claim
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1. A pressure sore detection system for detecting pressure sores in human tissue comprising:
- a memory device configured to store a plurality of values corresponding to a plurality of code sequences wherein said plurality of values is located by a plurality of cell addresses;
a code selector configured to select a code sequence from said plurality of code sequences during operation of said pressure sore detection system;
an address sequencer coupled to said memory device and said code selector configured to provide a cell address from said plurality of cell addresses corresponding to said selected code sequence;
a signal generator coupled to said code selector configured to generate a digital modulation signal representing said selected code sequence;
an optical illumination source of a first wavelength coupled to said signal generator configured to receive said digital modulation signal and configured to transmit a modulated optical signal of said first wavelength 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 configured to receive said modulated optical signal from said human tissue;
a processor coupled to said detector configured to derive a temporal transfer characteristic for said optical signal received by said detector and configured to detect said pressure sores 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 is a delayed version of said code sequence;
a second optical illumination source of a second wavelength coupled to said second signal generator for receiving said second digital modulation signal and configured to transmit a second modulated optical signal of said second wavelength to said human tissue in response to said second digital modulation signal; and
a position measurement device coupled to said processor configured to track position of said pressure sores.
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Abstract
The present invention pertains to a method and apparatus for pressure sore detection. 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. Tissue characteristics is determined based on the temporal transfer characteristic.
15 Citations
20 Claims
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1. A pressure sore detection system for detecting pressure sores in human tissue comprising:
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a memory device configured to store a plurality of values corresponding to a plurality of code sequences wherein said plurality of values is located by a plurality of cell addresses; a code selector configured to select a code sequence from said plurality of code sequences during operation of said pressure sore detection system; an address sequencer coupled to said memory device and said code selector configured to provide a cell address from said plurality of cell addresses corresponding to said selected code sequence; a signal generator coupled to said code selector configured to generate a digital modulation signal representing said selected code sequence; an optical illumination source of a first wavelength coupled to said signal generator configured to receive said digital modulation signal and configured to transmit a modulated optical signal of said first wavelength 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 configured to receive said modulated optical signal from said human tissue; a processor coupled to said detector configured to derive a temporal transfer characteristic for said optical signal received by said detector and configured to detect said pressure sores 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 is a delayed version of said code sequence; a second optical illumination source of a second wavelength coupled to said second signal generator for receiving said second digital modulation signal and configured to transmit a second modulated optical signal of said second wavelength to said human tissue in response to said second digital modulation signal; and a position measurement device coupled to said processor configured to track position of said pressure sores. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pressure sore detection system for detecting pressure sores in human tissue comprising:
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a memory device configured to store a plurality of values corresponding to a plurality of code sequences wherein said plurality of values is located by a plurality of cell addresses; a code selector configured to select a code sequence from said plurality of code sequences during operation of said pressure sore detection system; an address sequencer coupled to said memory device and said code selector configured to provide a cell address from said plurality of cell addresses corresponding to said selected code sequence; a signal generator coupled to said code selector configured to generate a digital modulation signal representing said code sequence; an optical illumination source of a first wavelength coupled to said signal generator configured to receive said digital modulation signal and configured to transmit a modulated optical signal of said first wavelength 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 configured to receive said modulated optical signal from said human tissue; a processor coupled to said detector configured to derive a temporal transfer characteristic for said optical signal received by said detector and configured to detect said pressure sores 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 is a delayed version of said code sequence; a second optical illumination source of a second wavelength coupled to said second signal generator for receiving said second digital modulation signal and configured to transmit a second modulated optical signal of said second wavelength to said human tissue in response to said second digital modulation signal; and a measurement depth adjustment device coupled to said optical illumination source configured to adjust depth of measurement of said human tissue. - View Dependent Claims (8, 9, 10, 11)
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12. A method for detecting pressures in human tissue comprising:
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storing a plurality of values corresponding to a plurality of code sequences wherein said plurality of values is located by a plurality of cell addresses; selecting code sequence from said plurality of code sequences during operation of a pressure detection system; providing a cell address from said plurality of cell addresses corresponding to said selected code sequence; generating a digital modulation signal associated with said code sequence; generating a modulated optical signal of a first wavelength based on said digital modulation signal; transmitting said modulated optical signal of said first wavelength to said human tissue; receiving a modified version of said modulated optical signal after transmitting to said human tissue; deriving a temporal transfer characteristic for said modified version of said modulated optical signal; analyzing said temporal transfer characteristic for presence of said pressure sores; generating a second code sequence with same ordering of code elements as said code sequence and beginning at different code elements; generating a second digital modulation signal associated with said second code sequence; generating a second modulated optical signal of a second wavelength based on said second digital modulation signal; transmitting said second modulated optical signal of said second wavelength to said human tissue; receiving a second modified version of said second modulated optical signal after transmission to said human tissue; and deriving a second temporal transfer characteristic for said second modified version of said second modulated optical signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification