Device for Determining Physiological Variables
First Claim
1. A device for the optical determination of physiological variables (pV'"'"'s) in perfused tissue with(a) at least a first light source (LEDa) and a second light source (LEDb), which emit light of a first and a second predetermined wavelength, wherein the light sources are disposed in such a way that the light they emit is able to penetrate the perfused tissue;
- (b) at least one photodetector (PD), which is disposed in such a way that it detects the light that is emitted by the light sources and transmitted and/or backscattered by the perfused tissue;
(c) a control unit, which supplies control signals to the light sources in such a way that the light sources continuously emit light in alternation with each other, wherein one or more dark phases can be inserted in this sequence, in which at least one of the light sources emits no light;
(d) an evaluation unit, which is connected with the output of the photodetector (PD),(e) wherein, for at least one pV to be measured, the evaluation unit supplies a displayable output signal to an interface that can be connected to the evaluation unit.
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Accused Products
Abstract
The device serves to optically determine physiological variables in perfused tissue. The device comprises a first and a second light source which each emit light radiation of a first or a second predetermined wavelength. The light sources are arranged in such a manner that the light radiation exiting them can penetrate into the perfused tissue. At least one photodetector is used, which is arranged so that it detects the light emitted by the light sources and passing through or backscattered by the perfused tissue. The device also comprises a control unit, which furnishes control signals to the light sources so that the light sources continuously emit light alternately, one or more dark phases can be inserted into this sequence, during which at least one light source does not emit any light. An evaluating device is connected to the output of the photodetector and furnishes, for at least one physiological variable to be measured, a displayable output signal to an interface that can be connected to the evaluating device.
31 Citations
25 Claims
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1. A device for the optical determination of physiological variables (pV'"'"'s) in perfused tissue with
(a) at least a first light source (LEDa) and a second light source (LEDb), which emit light of a first and a second predetermined wavelength, wherein the light sources are disposed in such a way that the light they emit is able to penetrate the perfused tissue; -
(b) at least one photodetector (PD), which is disposed in such a way that it detects the light that is emitted by the light sources and transmitted and/or backscattered by the perfused tissue; (c) a control unit, which supplies control signals to the light sources in such a way that the light sources continuously emit light in alternation with each other, wherein one or more dark phases can be inserted in this sequence, in which at least one of the light sources emits no light; (d) an evaluation unit, which is connected with the output of the photodetector (PD), (e) wherein, for at least one pV to be measured, the evaluation unit supplies a displayable output signal to an interface that can be connected to the evaluation unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 25)
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23. A device, which emits electromagnetic waves, especially light, of at least two different wavelengths and/or of at least two different bands of wavelengths from at least one source, where the electromagnetic waves are passed through a living and/or dead medium, preferably animal and/or human tissue and/or vessels to be tested, and the transmitted and/or reflected component of the electromagnetic waves is detected by a receiving system, which is suitable for detecting the light signals of different wavelengths in a time interval of less than one second, converting them to current and/or voltage signals that correspond to at least one measured value, and relaying them further, wherein at least one measured value from an evaluation unit is conditioned by signal conditioning, and, independently of the original wavelength, a measured value is further processed by active and/or passive electronic components.
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24. A device for the determination of physiological variables (pV'"'"'s) in tissue and/or vessels with
(a) at least one light source, which emits light, such that the light source is disposed in such a way that the light it emits is able to penetrate the tissue/vessel; -
(b) at least one photodetector (PD), which is disposed in such a way that it detects the light that is emitted by the light sources and transmitted and/or backscattered by the tissue/vessel; (c) an evaluation unit, which is connected with the photodetector (PD), (d) such that, for at least one pV to be measured, the evaluation unit supplies a displayable output signal to an interface that can be connected to the evaluation unit, (e) a socket and/or interface for receiving sensor signals, wherein the device can determine at least two pV'"'"'s selected from the following group;
pulse, SaO2, CaO2, SaCO, and cHb.
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Specification