Cable cross talk suppression
First Claim
1. An electronic patient monitor comprising:
- driving circuitry configured to generate an emitter control signal to cause an emitter of a medical sensor to emit light into a patient;
an amplifier configured to receive a detector signal generated when a detector of the medical sensor detects emitted light that passes through the patient; and
transient current discharge circuitry configured to discharge a transient current from the detector signal due to inductive coupling or capacitive coupling, or a combination thereof, of the emitter control signal with the detector signal, such that the transient current is at least partially discharged from the detector signal when the detector signal is received by the amplifier.
2 Assignments
0 Petitions
Accused Products
Abstract
Systems, methods, and devices are provided for suppressing cross-talk noise due to capacitive and/or inductive coupling in a medical sensor signal. For example, an embodiment of a patient monitor may include driving circuitry, an amplifier, and transient current discharge circuitry. When the driving circuitry drives an emitter to emit light into a patient, a detector may detect a portion of the light that passes through the patient, generating a detector signal. Cross-talk between the emitter driving signals and the detector signal may generate interference in the form of a transient current in the detector signal. Before the amplifier receives the detector signal, transient current discharge circuitry may discharge the transient current.
7 Citations
20 Claims
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1. An electronic patient monitor comprising:
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driving circuitry configured to generate an emitter control signal to cause an emitter of a medical sensor to emit light into a patient; an amplifier configured to receive a detector signal generated when a detector of the medical sensor detects emitted light that passes through the patient; and transient current discharge circuitry configured to discharge a transient current from the detector signal due to inductive coupling or capacitive coupling, or a combination thereof, of the emitter control signal with the detector signal, such that the transient current is at least partially discharged from the detector signal when the detector signal is received by the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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providing an emitter control signal to an emitter to cause the emitter to emit light into a patient using emitter control circuitry; and receiving into signal receiving circuitry a detector signal generated by a detector when the detector senses emitted light that passes through the patient, wherein; when transient current is expected in the detector signal, the signal receiving circuitry couples the detector signal to ground to discharge the transient current; and when the transient current is not expected in the detector signal, the signal receiving circuitry couples the detector signal to an amplifier. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system comprising:
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a medical sensor capable of emitting light into a patient in response to an emitter driving current, detecting a portion of the emitted light that passes through the patient, and generating a photocurrent based on the detected light; a patient monitor capable of generating the emitter driving current, receiving the photocurrent, and discharging transient current in the photocurrent before converting the photocurrent to a voltage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification