Pulse Oximeter Using Burst Sampling
First Claim
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1. A pulse oximeter method comprising:
- a) supplying power to at least one active component in a detector and amplifier circuit;
b) establishing a radiation state, optionally including activating a radiation source configured to emit radiation into a tissue;
c) receiving radiation that has passed through a tissue and allowing a corresponding signal to propagate through the detector and amplifier circuit;
d) taking at least one sample from the output of the detector and amplifier circuit;
e) optionally deactivating the radiation source if one was activated in part b;
f) completing a sampling burst by repeating steps b-e for all desired radiation states so that at least two radiation states are used and wherein a sampling burst has a duration of t1;
g) interrupting power to the detector and amplifier circuit, wherein the power interruption has a duration of t2 and wherein the detector and amplifier circuit remains on during steps a-f;
h) repeating steps a-g at least several times per second;
wherein each cycle of steps b-e is completed in 100 μ
s or less and wherein t1<
t2.
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Abstract
This application provides a method of data collection for a pulse oximeter and an improved pulse oximeter device and improved components thereof.
10 Citations
17 Claims
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1. A pulse oximeter method comprising:
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a) supplying power to at least one active component in a detector and amplifier circuit; b) establishing a radiation state, optionally including activating a radiation source configured to emit radiation into a tissue; c) receiving radiation that has passed through a tissue and allowing a corresponding signal to propagate through the detector and amplifier circuit; d) taking at least one sample from the output of the detector and amplifier circuit; e) optionally deactivating the radiation source if one was activated in part b; f) completing a sampling burst by repeating steps b-e for all desired radiation states so that at least two radiation states are used and wherein a sampling burst has a duration of t1; g) interrupting power to the detector and amplifier circuit, wherein the power interruption has a duration of t2 and wherein the detector and amplifier circuit remains on during steps a-f; h) repeating steps a-g at least several times per second; wherein each cycle of steps b-e is completed in 100 μ
s or less and wherein t1<
t2.- View Dependent Claims (2, 3, 4)
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5. A driver circuit for an oximeter radiation source comprising
a) a voltage source; -
b) an energy storage circuit configured to receive the output of the voltage source and charge up to that voltage; c) optionally at least one component forming a low pass network at the output of the voltage source, where the energy storage circuit may be part of said network; d) at least one radiation source configured to emit radiation into a tissue; e) at least one switching circuit controlling the flow of electrical current through the at least one radiation source; and f) optionally at least one resistor in series with the radiation source. - View Dependent Claims (6, 7, 8)
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9. A pulse oximeter comprising a driver circuit for a radiation source and a detector and amplifier circuit, wherein
a) the driver circuit for the radiation source comprises: -
i) a voltage source; ii) an energy storage circuit to receive the output of the voltage source and charge up to that voltage; iii) optionally at least one components forming a filter network at the output of the voltage source, where the energy storage circuit may be part of said network; iv) at least one radiation source configured to emit radiation into a tissue; v) at least one switching circuit controlling the flow of electrical current through the at least one radiation source; and vi) optionally at least one resistor in series with the capacitor and the radiation source; and b) a detector and amplifier circuit, configured to receive a signal from a photodetector and output a corresponding signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification