Power conserving adaptive control system for generating signal in portable medical devices
First Claim
1. A system for adjusting power employed by a light emitting device used for medical applications, comprising:
- a light emitting device;
a power unit coupled to said light emitting device for powering the light emitting device and responsive to a control signal for adjusting power applied to the light emitting device;
a control unit for providing the control signal and coupled to the power unit, the control signal being determined in response to an estimated signal quality value required for measuring a physiological parameter and a characteristic of a signal associated with the physiological parameter measured using light produced by the light emitting device.
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Accused Products
Abstract
A system and method for adjusting power employed by a light emitting device used for medical applications, such as measurement of patient parameter. A system or device includes a light emitting device, a power unit coupled to the light emitting device for powering the light emitting device and responsive to a control signal for adjusting power applied to the light emitting device, and a control unit for providing the control signal and coupled to the power unit, the control signal being determined in response to a characteristic of a signal associated with a physiological parameter measured using light produced by the light emitting device.
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Citations
23 Claims
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1. A system for adjusting power employed by a light emitting device used for medical applications, comprising:
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a light emitting device;
a power unit coupled to said light emitting device for powering the light emitting device and responsive to a control signal for adjusting power applied to the light emitting device;
a control unit for providing the control signal and coupled to the power unit, the control signal being determined in response to an estimated signal quality value required for measuring a physiological parameter and a characteristic of a signal associated with the physiological parameter measured using light produced by the light emitting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a device for monitoring a patient parameter including a signal source for emitting a monitoring signal and a sensor for receiving a modulated signal representing the emitted monitoring signal modulated by the parameter, an emitted monitoring signal controller for controlling a signal characteristic of the emitted monitoring signal, comprising:
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a parameter signal processor for receiving the modulated signal and generating a parameter output representing the parameter, a signal quality processor for measuring received signal characteristics of the modulated signal, a signal evaluation processor for evaluating the received signal characteristics of the modulated signal with respect to required signal characteristics of the modulated signal for generating the parameter output, a signal control processor for controlling an emitted signal characteristic of the emitted monitoring signal so that the received modulated signal possesses the required signal characteristics. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for adjusting power emitted by a light emitting device used for medical applications, comprising the steps of:
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determining a characteristic of a signal associated with a physiological parameter measured using light produced by the light emitting device, generating a control signal based upon an estimated quality value for measuring a physiological parameter and the characteristic of the signal, and providing the control signal to a power unit coupled to the light emitting device and providing power to the light emitting device and adjusting the power provided to the light emitting device in accordance with the control signal. - View Dependent Claims (16, 17, 18)
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19. In a device for monitoring a patient parameter including a signal source for emitting a monitoring signal and a sensor for receiving a modulated signal representing the emitted monitoring signal modulated by the parameter, a method for controlling a signal characteristic of the emitted monitoring signal, comprising the steps of:
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measuring received signal characteristics of the modulated signal, evaluating the received signal characteristics of the modulated signal with respect to required signal characteristics of the modulated signal for generating the parameter output, controlling an emitted signal characteristic of the emitted monitoring signal so that the received modulated signal possesses the required signal characteristics. - View Dependent Claims (20, 21, 22, 23)
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Specification