An optimal diagnosis point detector for noninvasive diagnosis of blood constituents

Abstract: An optimal diagnosis point detector for noninvasive diagnosis of blood constituents includes detecting means (14) for detecting a predetermined signal concerning bloodstream quantity from a portion of a subject to be diagnosed, driving means (18) for driving the detecting means (14), amplifying means (13 for amplifying an output signal of the detecting means (14), analog-to-digital (AID) converting means (16) for receiving a signal output from the amplifying means (13) and converting the same into digital data, storage means (24) encoded with a sequence of computer readable instructions for performing a predetermined optimal diagnosis point detecting method, means (17) through which a user's command is input, central processing means (20) connected to the driving means, the AID converting means, the command inputting means and the storage means, for performing the predetermined optimal diagnosis point detecting method encoded in the storage means (24) according to the user's input command, and display means (22) connected to the central processing means (20) for displaying a detected value and displaying an indication that the detected value is the maximum value when a maximum detection signal is detected from the detecting means. The concentration of blood constituents of a subject to the diagnosed can be calculated accurately. Also, blood constituents having only a low concentration can be accurately measured.

Description: The present invention relates to a noninvasive diagnostic device, and more particularly, to an optimal diagnosis point detector for noninvasive diagnosis of blood constituents for detecting an optimal diagnosis point among various portions of a subject's body, and a noninvasive diagnostic device for performing a noninvasive diagnosis at the detected point using the same. In general, a noninvasive diagnostic device irradiates light of a specific wavelength into a predetermined portion of the body such as fingers or a wrinkle and detects the light reflected or transmitted from the light-irradiated portion, thereby measuring the concentration of blood constituents such as hemoglobin, glucose, cholesterol, alcohol or villirubin. In other words, light of a specific wavelength, at which the light reacts readily with a specific blood constituent and a large quantity of light is absorbed, is irradiated into a diagnosis portion to then detect reflected or transmitted light. Then, the light which is absorbed less readily is irradiated into the specific portion to then detect reflected or transmitted light. Finally, the concentration of blood constituents is calculated using experimentally precalculated data of the concentration and absorbance of a specific constituent by means of the amount of two kinds of the detected light. However, in the case of using a conventional noninvasive diagnostic device, since a user does not detect a portion having the maximum detected value due to a high flow of blood in a bloodstream to be measured, the reflected or transmitted light amount is very small, which makes it difficult to measure blood constituents accurately. In other words, the constituents that are heavily concentrated in the blood can be measured to some extent, but the measurement accuracy is poor. Further, the constituents that are lightly concentrated in the blood is difficult to measure. EP 0587009 discloses an alignment guide system for use with conventional pulse, oximetry systems. The system generates a display showing the magnitude of the optical coupling between light emitters and alight detector used in a sensor. By manipulating the position of the sensor while observing the display, medical practitioners can ensure correct alignment between the light emitters and the light detector. It is an object of the present invention to provide an optimal diagnosis point detector for noninvasive diagnosis of blood constituents, for detecting a point having the maximum detected value due to a high flow of blood in a bloodstream among various diagnosis portions of a subject. Another object of the present invention is to provide a noninvasive diagnostic device using an optimal diagnosis point detector for noninvasive diagnosis of blood constituents, for measuring the concentration of a subject's blood constituents accurately by detecting a point at which a detected value is largest using an optimal diagnosis point detector for noninvasive diagnosis of blood constituents and performing the noninvasive diagnosis at the detected point. To accomplish the first object of the present invention, there is provided an optimal diagnosis point detector for non-invasive diagnosis of blood constituents in a subject's bloodstream comprising: first detecting means for generating an input signal to irradiate a portion of the subject to be diagnosed, detecting at least one of a predetermined signal that has been passed through the portion and a predetermined signal that has been reflected from the portion, and outputting an output signal representative of bloodstream quantity; first driving means for driving the first detecting means; first amplifying means for amplifying the output signal from the first detecting means; analog-to-digital (A/D) converting means for receiving an output signal from the first amplifying means and converting the output signal from the first amplifying means into a digital detected value; storage means encoded with a sequence of computer readable instructions for performing a predetermined optimal diagnosis point detecting method; command input means through which a user's command is input; central processing means connected to the first driving means, the A/D converting means, the command inputting means and the storage means, arranged to perform the predetermined optimal diagnosis point detecting method encoded in the storage means according to the user's input command to determine a detection point at which the digital detection value from the A/D converting means has a maximum value as the optimal diagnosis point; and display means connected to the central processing means arranged to display the digital detected value and to display an indication that the digital detected value is a maximum value when a maximum detection signal is detected from the first detecting means. It is preferred that the optimal diagnosis point detecting method performed by the central processing means comprises the steps of: a) operating the driving means by applying a predetermined signal thereinto; b) converting the signal amplified by the amplifying means after being detected from the detecting means operated by the output signal/of the driving means into digital data using the A/D converter; c) comparing the digital data value with a predetermined reference value, moving a detection point and then returning the operation to the step b) if the digital data value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined reference value; and d) displaying the digital data value on the display means and displaying an indication that the digital data value is a maximum value. Also, it is preferred that the optimal diagnosis point detecting method performed by the central processing means comprises the steps of: a) operating the driving means by applying a predetermined signal thereinto; b) converting the signal amplified by the amplifying means after being detected from the detecting means operated by the output signal of the driving means into digital data using the A/D converter; c) comparing the digital data value with a predetermined reference value, moving a detection point and then returning the operation to the step b) if the digital data value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined reference value; d) replacing the reference value with the value of the digital data; e) displaying the digital data value on the display means; f) determining whether the number of detections is greater than or equal to a predetermined number of times, moving a detection point and then returning the operation to the step b) if the number of detections is smaller than the predetermined number, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined number; and g) displaying the reference value on the display means and displaying an indication that the reference value is a maximum value. Also, it is preferred that there is further comprised means for filtering the output of the amplifying means between the amplifying means and the A/D converter. Further, it is preferred that the detecting means includes light generating means for generating light to irradiate the light into the portion to be diagnosed, and a photodetector means for detecting the light amount reflected or transmitted from the portion to be diagnosed. The light generating means is preferably any one of a flash lamp for generating pulsating light and a continuous emitting bulb. Also, it is preferred that the detecting means includes an ultrasonic generating means for generating an ultrasonic wave to irradiate the same into the portion to be diagnosed and an ultrasonic detecting means for detecting the frequency of the ultrasonic wave reflected from the portion to be diagnosed. Also, it is preferred that the detecting means is a piezo-electric element for detecting variations in pressure of the portion to be diagnosed which changes according to the flow of said bloodstream. Further, it is preferred that the detecting means is a charge-coupled device (CCD) camera, and the optimal diagnosis point detecting method is performed such that the portion to be diagnosed is photographed by the CCD camera and then detecting the portion where the level of brightness in the grade scale changes sharply due to a large flow of blood in a bloodstream at the photographed portion. To accomplish the second object of the present invention, there is provided a non-invasive diagnostic device comprising the optimal diagnosis point detector describe above; first light emitting means for emitting a first plurality of beams having different wavelengths to react to blood constituents to be measured to irradiate the first plurality of beams into the portion to be diagnosed; second light emitting means for emitting a second plurality of beams having different wavelengths to react to constituents.other than the blood constituents to be measured to irradiate the second plurality of beams into the portion to be diagnosed; second detecting means for detecting reflected or transmitted light from the portion to be diagnosed after the first and second plurality of beams are irradiated; second driving means for driving the first light emitting means; third driving means for driving the second light emitting means; first filtering means having a first plurality of filters for filtering respective outputs of the second detecting means at frequency bands of the respective beams emitted by the first light emitting means; second filtering means having a second plurality of filters for filtering the respective outputs of the second detecting means at frequency bands of the respective beams emitted by the second light emitting means; second amplifying means having a first plurality of amplifiers for amplifying the respective outputs of the first filtering means; third amplifying means having a second plurality of amplifiers for amplifying the respective outputs of the second filtering means; multiplexing means for multiplexing the outputs of the first, second and third amplifying means; wherein the A/D converting means further receives output signals from the second and third amplifying means, the output signals from the first, second and third amplifying means being received by the A/D converting means as an output signal from the multiplexing means; the storage means is further encoded with a sequence of computer readable instructions for performing a blood constituent concentration calculating method; the central processing means is further connected to the second and third driving means for performing the optimal diagnosis point detecting method and the blood constituent concentration calculating method encoded in the storage means according to the user's input command; and the display means is further for displaying the calculated blood constituent concentration. It is preferred that the optimal diagnosis point detecting method and the blood constituent concentration calculating method performed by the central processing means comprises the steps of: a)operating the first driving means by applying a predetermined signal thereinto; b) converting the signal amplified by the first amplifying means after being detected from the first detecting means operated by the output signal of the first driving means into digital data using the A/D converter by applying a control signal to the multiplexing means and inputting the same into the A/D converting means; c) comparing the digital data value with a predetermined reference value, moving a detection point and then returning the operation to the step b) if the digital data value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined reference value; d) displaying the digital data value on the display means and displaying an indication that the digital data value is the maximum value; e) operating the second driving means by applying a predetermined signal thereinto when the optimal diagnosis point is detected by the steps a) through d); f) inputting a plurality of signals amplified by the second amplifying means after being detected from the second detecting means and filtered by the first filtering means into the A/D converting means by applying a control signal into the multiplexing means, converting the same into digital data and storing the converted data in the storage means; g) inputting a plurality of signals amplified by the third amplifying means after being detected from the second detecting means and filtered by the second filtering means into the A/D converting means by applying a control signal into the multiplexing means, converting the same into digital data and storing the converted data in the storage means; h) calculating the amount of noise components other than the components to be measured using the value converted into digital data via the second filtering means; I) eliminating the noise components from the data of blood constituents to be measured by subtracting a value obtained by reflecting a scale constant on the noise component amount calculated in the step h) from the converted value via the first filtering means; j) calculating the concentration of blood constituents to be measured using the value of the noise-eliminated blood constituents; and k) displaying the calculated concentration on the display means. It is preferred that the optimal diagnosis point detecting method and the blood constituent concentration calculating method performed by the central processing means comprises the steps of: a)operating the first driving means by applying a predetermined signal thereinto; b) converting the signal amplified by the first amplifying means after being detected from the first detecting means into digital data using the A/D converter by applying a control signal to the multiplexing means and inputting the same into the A/D converting means; c) comparing the digital data value with a predetermined reference value, moving a detection point and then returning the operation to the step b) if the digital data value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined reference value; d) replacing the reference value with a value of the digital data; e) displaying the reference value on the display means; f) determining whether the number of detections is greater than or equal to a predetermined number, moving a detection point and then returning the operation to the step b) if the number of detections is smaller than the predetermined number, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined number; g) displaying the reference value and displaying an indication that the reference value is the maximum value; h) operating the second driving means by applying a predetermined signal thereinto when the optimal diagnosis point is detected by the steps b) through g); I) sequentially inputting a plurality of signals amplified by the second amplifying means after being detected from the second detecting means and filtered by the first filtering means into the A/D converting means by applying a control signal into the multiplexing means, converting the same into digital data and storing the converted data in the storage means; j) inputting a plurality of signals amplified by the third amplifying means after being detected from the second detecting means and filtered by the second filtering means into the A/D converting means by applying a control signal into the A/D converting means, converting the same into digital data and storing the converted data in the storage means; k) calculating the amount of noise components other than the components to be measured using the value converted into digital data via the second filtering means; l) eliminating the noise components from the data of blood constituents to be measured by subtracting a value obtained by reflecting a scale constant on the noise component amount calculated in the step k) from the converted value via the first filtering means; m) calculating the concentration of blood constituents to be measured using the value of the noise-eliminated blood constituents; and n) displaying the calculated concentration on the display means. Further, it is preferred that the first detecting means comprises light generating means for generating light to irradiate the light into the portion to be diagnosed, and a photodetector means for detecting the light amount reflected or transmitted from the portion to be diagnosed. Also, it is preferred that the light generating means is any one of a flash lamp for generating pulsating light and a continuous emitting bulb. It is preferred that the light generating means is any one of a flash lamp for generating pulsating light and a continuous emitting bulb. It is preferred that each of the first and second light emitting means are any one of a laser diode and an emitting diode, and a lamp for generating the light of a wide-band frequency. Also, it is preferred that the first and second light emitting means are any one of a combination of a laser diode and an emitting diode, and a lamp for generating the light of a wide-band frequency. Further, it is preferred that the first and second light emitting means are any of a flash lamp for generating pulsating light and a continuous emitting bulb for emitting continuous light. The above objects and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which: FIG. 1 is a block diagram illustrating an optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to a first embodiment of the present invention; FIG. 2 is a block diagram illustrating an optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to a second embodiment of the present invention; FIG. 3 is a block diagram illustrating an optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to a third embodiment of the present invention; FIG. 4 is a block diagram illustrating an optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to a fourth embodiment of the present invention; FIG. 5 is a flow chart for explaining the operation of the optimal diagnosis point detector for noninvasive diagnosis of blood constituents shown in FIG. 1; FIG. 6 is another flow chart for explaining the operation of the optimal diagnosis point detector for noninvasive diagnosis of blood constituents shown in FIG. 1; FIG. 7 is a block diagram of a noninvasive diagnostic device using the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to the present invention; and FIG. 8 is a flow chart for explaining the operation of the noninvasive diagnostic device using the optimal diagnosis point detector for noninvasive diagnosis of blood constituents shown in FIG. 7. Referring to FIG. 1, the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to a first embodiment of the present invention includes a light generator 12 for irradiating light of a predetermined wavelength into a portion 10 of the subject to be diagnosed, a photodetector 14 for detecting the amount of light that is reflected from the subject's blood constituents, a driver 18 for driving the light generator 14, an amplifier 13 for amplifying the detection signal output from the photodetector 14, a filter 15 for filtering the output signal of the amplifier 13, an analog-to-digital (A/D) converter 16 for receiving the signal output from the filter 15 and converting the same into digital data, a memory 24 in which a predetermined optimal diagnosis point detecting method is stored, a key pad 17 through which a user's command is input, a microprocessor 20 connected to the driver 18, the A/D converter 16, the key pad 17 and the memory 24, for performing the optimal diagnosis point detecting method stored in the memory 24 according to the user's input command, and a display 22 connected to the microprocessor 20, for displaying the detected value and displaying that the detected value is the maximum value when the maximum detection signal is detected from the photodetector 14. The operation of the above optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to a first embodiment of the present invention will now be explained with reference to FIG. 5, in view of the optimal diagnosis point detecting method performed by the microprocessor 20. Referring to FIGs. 1 and 5, when a "Start" command is input through the key pad 17 by a user, the microprocessor 20 sets a predetermined reference value in step S62. In step S64, a predetermined signal is applied to the driver 18 to drive the same. If the driver 18 is operated, the light generator 12 generates light of a predetermined wavelength to irradiate the light into the portion 10 to be diagnosed. Here, the light generator 12 is preferably a flash lamp for generating pulsating light of a predetermined width or a continuous emitting bulb for emitting continuous light. Specifically, if the flash lamp is used as the light generator 12, the light generator 12 generates very strong light pulses instantaneously. Thus, a signal-to-noise ratio is improved, thereby enhancing the overall performance. Among the light beams irradiated into the portion 10 to be diagnosed, the reflected light is detected in the photodetector 14, amplified in the amplifier 13, and is filtered by the filter 15. In step S66, this signal is converted into digital data by the A/D converter 16. In step S68, the converted digital data, i.e., the detected value, and a predetermined reference value are compared. If the detected value is smaller than the predetermined reference value, the detection point is moved and the operation returns to the step S66. If the detected value is greater than or equal to the reference value, the operation proceeds to a subsequent step. In step S70, the reference value is replaced with the detected value. In step S72, the reference value replaced with the detected value is displayed on the display 22. In step S74, a determination of whether the number of detection is greater than or equal to a predetermined number of times (N) is made. If the number of detections is less than N, the detection point is moved and the operation returns to step S66. If the number of detection is greater than or equal to N, the operation proceeds to a subsequent step. In step S76, the reference value replaced with the detected value is displayed on the display 22 and an indication that the reference value is the maximum value is displayed. In step S78, a determination of whether a "Detect Again" command has been input is made. If "Detect Again" is input, the operation returns to step S66, otherwise, the optimal diagnosis point detecting method is complete. To reposition the photodetector 14 at a point where the detected value is the largest, the steps S66 and S68 are repeatedly performed until a value greater than or equal to the maximum detected value is detected while the detected points are detected again by moving the light generator 12 and photodetector 14. When the maximum value is displayed again on the display 22, the detection is terminated. FIG. 6 shows another optimal diagnosis point detecting method, in which the optimal diagnosis point is detected by determining a point where the detected value is greater than or equal to a predetermined reference value to be the optimal diagnosis point. Here, the reference value is a value obtained experimentally for accurate calculation of blood constituents. Referring to FIGs. 1 and 6, if a "Start" command is input through the key pad 17, the microprocessor 20 sets a predetermined reference value in step S80. In step S82, a predetermined signal is applied to the driver 18 to operate the driver 18. If the driver 18 is operated, the light generator 12 generates light of a predetermined wavelength to irradiate the light into the portion 10 to be diagnosed. Among the light beams irradiated into the portion 10 to be diagnosed, the reflected light is detected in the photodetector 14, amplified in the amplifier 13, and is filtered by the filter 15. In step S84, this signal is converted into digital data by the A/D converter 16. In step S86, the converted digital data value, i.e., the detected value, and a predetermined reference value are compared. If the detected value is smaller than the predetermined reference value, the detection point is moved and the operation returns to step S84. If the detected value is greater than or equal to the reference value, the operation proceeds to a subsequent step. In step S88, the detected value is displayed on the display 22 and an indication that the detected value is the maximum value is displayed, thereby completing the optimal diagnosis point detecting method. According to the first embodiment of the present invention, an ultrasonic generating means and an ultrasonic detecting means are used as the light generator 12 and photodetector 14, respectively. In this case, since the magnitude of the signal output according to the frequency of the detected signal, the ultrasonic detecting means detects the frequency of the reflected ultrasonic waves to discriminate a detection signal, thereby detecting the optimal diagnosis point. FIGs. 2, 3 and 4 schematically show the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to second, third and fourth embodiments of the present invention. Referring to FIG. 2, in the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to the second embodiment of the present invention, the photodetector 14 detects light transmitted through the portion 10 to be diagnosed, unlike the optimal diagnosis point detector shown in FIG. 1 in which the photodetector 14 detects the reflected light. Here, the light generator 12 is preferably a flash lamp for generating pulsating light of a predetermined width or a continuous emitting bulb for emitting continuous light. Also, referring to FIG. 3, instead of the light generator 12 and photodetector 14 used in the first embodiment, a piezo-electric elements 26 is used in the optimal diagnosis point detector according to the third embodiment of the present invention to detect the pressure of a point where the flow of blood through a bloodstream is largest, thereby detecting a point where the detected value is maximum. In the optimal diagnosis point detector according to the fourth embodiment of the present invention shown in FIG. 4, a charge coupled device (CCD) camera 28 is used as the detecting means. The light generated from a light source 30 is irradiated into the portion 10 to be diagnosed and then the portion 10 to be diagnosed is photographed by the CCD camera 28, thereby detecting a point where the level of brightness in the grade scale due to a high flow in the bloodstream changes sharply to then display the detected point on the display 22. In order to conduct noninvasive diagnosis using the optimal diagnosis point detector according to the fourth embodiment of the present invention, a detector of a noninvasive diagnostic device (not shown) is positioned at the optimal diagnosis point indicated in the display 22. Next, the operation of the noninvasive diagnostic device having the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to the present invention will be described with reference to FIGs. 7 and 8. FIG. 7 is a block diagram of a noninvasive diagnostic device using the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to the present invention, and FIG. 8 is a flow chart for explaining the operation of the noninvasive diagnostic device using the optimal diagnosis point detector for noninvasive diagnosis of blood constituents shown in FIG. 7. Referring to FIGs. 7 and 8, the noninvasive diagnostic device having the optimal diagnosis point detector for noninvasive diagnosis of blood constituents according to the embodiment of the present invention includes a first light generator 69 for irradiating light of a predetermined wavelength into a portion 10 of the subject to be diagnosed, a first photodetector 73 for detecting the amount of light reflected or transmitted from the subject's blood constituents, a first driver 40 for driving the first light generator 69, a first amplifier 46 for amplifying a detection signal output from the first photodetector 73, a first filter 56 for filtering an output signal of the first amplifier 46, a second light generator 70 for irradiating a plurality of light beams of different wavelengths to react to the blood constituents to be measured into a portion 10 of the subject to be diagnosed, a third light generator 72 for irradiating a plurality of light beams of different wavelengths to react to the constituents other than the blood constituents to be measured into a portion 10 of the subject to be diagnosed, a second photodetector 74 for detecting the light reflected or transmitted from the portion 10 to be diagnosed, a second driver 42 for driving the second light generator 70, a second filter 1 for filtering a signal in the range of wavelengths reacting with blood constituents to be measured among the outputs of the second photodetector 74, a third filter 2 for filtering a signal in the range of wavelengths reacting with the constituents other than blood constituents to be measured among the outputs of the second photodetector 74, a second amplifier 3 for amplifying the output of the second filter 1, a third amplifier 4 for amplifying the output of the third filter 2, a multiplexer 66 for multiplexing the outputs of the first filter 56, second and third amplifiers 3 and 4, an analog-to-digital (A/D) converter 68 for converting the output signal of the multiplexer 66 into digital data, a memory 78 in which a predetermined optimal diagnosis point detecting method and a blood constituent concentration calculating method are stored, a key pad 76 through which a user's command is input, a microprocessor 80 connected to the first, second and third drivers 40, 42 and 44, the A/D converter 68, the memory 78 and the key pad 76, for performing the optimal diagnosis point detecting method and blood constituent concentration calculating method according to the user's input command, and a display 82 connected to the microprocessor 80, for displaying a detected value, displaying an indication that the detected value is the maximum value and displaying the calculated blood constituent concentration when the maximum detection signal is detected from the first photodetector 73. In the aforementioned configuration, the second filter 1 includes a plurality of filters, the third filter 2 includes a plurality of filters, the second amplifier 3 includes a plurality amplifiers, and the third amplifier 4 includes a plurality of amplifiers. The light generators and photodetectors together form a number of detecting means. Next, the operation of the noninvasive diagnostic device having the above optimal diagnosis point detector for non invasive diagnosis of blood constituents according to the present invention will be explained in view of the optimal diagnosis point detecting method and blood constituent concentration calculating method which are performed by the microprocessor 80. Since the optimal diagnosis point detecting method is the same as that illustrated in FIG. 5 or FIG. 6, the explanation thereof will be omitted herein. After detecting the optimal diagnosis point, the operation related to the blood constituent concentration calculating method will be explained. Referring to FIGs. 6, 7 and 8, in step S90, the optimal diagnosis point is detected according to the sequence flow shown in FIG. 5 or FIG. 6 using the first driver 40, the first light generator 69, the first photodetector 73, the first amplifier 46 and the first filter 56. In step S92, the second driver 42 is operated by applying a predetermined signal thereto, the second light generator 70 sequentially generates the light of Group I to react to the blood constituents to be measured by the output signal of the second driver 42 to irradiate the same into the portion 10 to be diagnosed, parts of the light irradiated into the portion 10 to be diagnosed are reflected to be filtered by the second filter 1, amplified by the second amplifier 3, and then the microprocessor 80 converts the detected signal into digital data by the A/D converter 68 by applying a control signal CS to the multiplexer 66 and sequentially stores the converted data in the memory 78. In step S94, the third driver 44 is operated by applying a predetermined signal to the third driver 44, the third light generator 72 then generates light of Group II to react to the constituents other than blood constituents, e.g., skin, bone, water or fat, by the output signal of the third driver 44 to irradiate the light into the portion 10 to be diagnosed, parts of the light irradiated into the portion 10 to be diagnosed are reflected to be filtered by the second filter 1, amplified by the third amplifier 3, and then the microprocessor 80 converts the detected signal into digital data by the A/D converter 68 by applying a control signal CS to the multiplexer 66 and sequentially stores the converted data in the memory 78. In step S96, the amount of noise components is calculated using the digital data for the signal reflected by reaction to the constituents other than blood constituents to be measured stored in the memory 78. In step S98, the noise component effect is minimized from the digital data for the blood constituents to be measured by subtracting a value obtained by multiplying the calculated amount of the noise components with a predetermined proportional constant from the digital data for the signal reflected by reaction to the blood constituents to be measured stored in the memory 78. As described above, the noise components are eliminated from the detected signal, thereby calculating the concentration of the blood constituents to be measured accurately. In step S100, the accurate concentration of the noise-eliminated blood constituents to be measured is calculated using the digital data thereof. The blood constituents are accurately calculated using the graph illustrating the experimentally obtained concentration of the blood constituents to be measured and a predetermined equation. In step S110, the concentration of the blood constituents calculated in the step S100 is displayed on the display 82 to notify to the user. Here, the first, second and third light generators 69, 70 and 72 are preferably a flash lamp for generating pulsating light of a predetermined width or a continuous emitting bulb for emitting continuous light. Specifically, when the flash lamp is used as the first, second and third light generators 69, 70 and 72, the light generators 69, 70 and 72 generate light pulses having a very strong intensity instantaneously. Thus, the overall S/N ratio can be improved. As described above, according to the present invention, since the noninvasive diagnosis is conducted at a point where the detected value becomes the maximum value due to the maximum bloodstream quantity after detecting the point, the concentration of the subject's blood constituents can be measured accurately. Also, since a plurality of light beams are used and noise components are eliminated therefrom to minimize the noise component effect, the constituents that are very lightly concentrated in blood can be accurately measured.

Claims: An optimal diagnosis point detector for non-invasive diagnosis of blood constituents in a subject's bloodstream comprising: first detecting means (12, 14) for generating an input signal to irradiate a portion of the subject to be diagnosed, detecting at least one of a predetermined signal that has been passed through the portion and a predetermined signal that has been reflected from the portion, and outputting an output signal representative of bloodstream quantity; first driving means (18) for driving the first detecting means (12, 14); first amplifying means (13) for amplifying the output signal from the first detecting means (12, 14); analog-to-digital (A/D) converting means (16) for receiving an output signal from the first amplifying means (13) and converting the output signal from the first amplifying means (13) into a digital detected value; storage means (24) encoded with a sequence of computer readable instructions for performing a predetermined optimal diagnosis point detecting method; command input means (17) through which a user's command is input; central processing means (20) connected to the first driving means (18), the A/D converting means (16), the command inputting means (17) and the storage means (24), arranged to perform the predetermined optimal diagnosis point detecting method encoded in the storage means (24) according to the user's input command to determine a detection point at which the digital detection value from the A/D converting means has a maximum value as the optimal diagnosis point; and display means (22) connected to the central processing means (20) arranged to display the digital detected value and to display an indication that the digital detected value is a maximum value when a maximum detection signal is detected from the first detecting means (12, 14). The optimal diagnosis point detector as claimed in claim 1, wherein the optimal diagnosis point detecting method performed by the central processing means (20) comprises: a) operating the first driving means (18) by applying a predetermined signal thereto; b) converting the output signal from the first amplifying means (13) into the digital detected value using the A/D converting means (16); c) comparing the digital data value with a predetermined reference value, moving a detection point and then returning to the step (b) if the digital detected value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined reference value; and d) displaying the digital detected value on the display means (22) and displaying an indication that the digital detected value is a maximum value. The optimal diagnosis point detector as claimed in claim 1, wherein the optimal diagnosis point detecting method performed by the central processing means (20) comprises: a) operating the first driving means (18) by applying a predetermined signal thereto; b) converting the output signal from the first amplifying means (13) into the digital detected value using the A/D converting means (16); c) comparing the digital data value with a predetermined reference value, moving a detection point and then returning to the step (b) if the digital detected value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital data value is greater than or equal to the predetermined reference value; d) replacing the reference value with the digital detected value; e) displaying the digital detected value on the display means (22); f) determining whether the number of detections is greater than or equal to the predetermined number, moving a detection point and then returning to the step (b) if the number of detections is smaller than the predetermined number, and proceeding to a subsequent step if the number of detections is greater than or equal to the predetermined number; and g) displaying the digital detected value on the display means (22) and displaying an indication that the digital detected value is a maximum value. The optimal diagnosis point detector as claimed in any preceding claim, further comprising means (15) for filtering the output signal from the first amplifying means (13) between the first amplifying means (13) and the A/D converting means (16). The optimal diagnosis point detector as claimed in any preceding claim, wherein the first detecting means (12, 14) includes light generating means (12) for generating light to irradiate the light into the portion to be diagnosed, and a photodetector means (14) for detecting a light amount reflected or transmitted from the portion to be diagnosed. The optimal diagnosis point detector as claimed in claim 5, wherein the light generating means (12) is at least one of a flash lamp for generating pulsating light and a continuous emitting bulb. The optimal diagnosis point detector as claimed in any of claims 1 to 4, wherein the first detecting means (12, 14) includes an ultrasonic generating means for generating an ultrasonic wave to irradiate the ultrasonic wave into the portion to be diagnosed and an ultrasonic detecting means for detecting the frequency of the ultrasonic wave reflected from the portion to be diagnosed. The optimal diagnosis point detector as claimed in any of claims 1 to 4, wherein the first detecting means (12, 14) is a piezoelectric element for detecting variations in pressure of the portion to be diagnosed, wherein the pressure changes according to the flow of the bloodstream. The optimal diagnosis point detector as claimed in claim 1, wherein the first detecting means (12, 14) is a charge-coupled device (CCD) camera (28) and a light source (30). A non-invasive diagnostic device comprising: the optimal diagnosis point detector as claimed in claim 1; first light emitting means (69) for emitting a first plurality of beams having different wavelengths to react to blood constituents to be measured to irradiate the first plurality of beams into the portion to be diagnosed; second light emitting means (70) for emitting a second plurality, of beams having different wavelengths to react to constituents other than the blood constituents to be measured to irradiate the second plurality of beams into the portion to be diagnosed; second detecting means (74) for detecting reflected or transmitted light from the portion to be diagnosed after the first and second plurality of beams are irradiated; second driving means (42) for driving the first light emitting means (70); third driving means (44) for driving the second light emitting means (72); first filtering means (1) having a first plurality of filters for filtering respective outputs of the second detecting means (74) at frequency bands of the respective beams emitted by the first light emitting means (70); second filtering means (2) having a second plurality of filters for filtering the respective outputs of the second detecting means (74) at frequency bands of the respective beams emitted by the second light emitting means (72) ; second amplifying means (3) having a first plurality of amplifiers for amplifying the respective outputs of the first filtering means (1); third amplifying means (4) having a second plurality of amplifiers for amplifying the respective outputs of the second filtering means (2); multiplexing means (66) for multiplexing the outputs of the first, second and third amplifying means; wherein: the A/D converting means (68) further receives output signals from the second and third amplifying means (3, 4), the output signals from the first, second and third amplifying means being received by the A/D converting means as an output signal from the multiplexing means (66); the storage means (78) is further encoded with a sequence of computer readable instructions for performing a blood constituent concentration calculating method; the central processing means (80) is further connected to the second and third driving means for performing the optimal diagnosis point detecting method and the blood constituent concentration calculating method encoded in the storage means (78) according to the user's input command; and the display means (82) is further for displaying the calculated blood constituent concentration. The non-invasive diagnostic device of claim 10, wherein the optimal diagnosis point detecting method and the blood constituent concentration calculating method performed by the central processing means (80) comprises: a) operating the first driving means (40) by applying a predetermined signal thereto; b) converting the output signal from the first amplifying means (46) into a digital detected value using the A/D converting means (68) by applying a control signal to the multiplexing means (66) and inputting the output signal from the first amplifying means (46) into the A/D converting means (68); c) comparing the digital detected value with a predetermined reference value, moving a detection point and then returning to the step (b) if the digital detected value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital detected value is greater than or equal to the predetermined reference value; d) displaying the digital detected value on the display means (82) and displaying an indication that the digital detected value is a maximum value; e) operating the second driving means (42) by applying a predetermined signal thereto when the optimal diagnosis point is detected by the steps (a) through (d); f) inputting a plurality of signals amplified by the second amplifying means (3) into the A/D converting means (68) by applying a control signal to the multiplexing means (66), converting the plurality of signals amplified by the second amplifying means (3) into digital data, and storing the converted data in the storage means (78); g) inputting a plurality of signals amplified by the third amplifying means (3) into the A/D converting means (68) by applying a control signal to the multiplexing means (66), converting the plurality of signals amplified by the third amplifying means (3) into digital data, and storing the converted data in the storage means (78); h) calculating an amount of noise components other than the components to be measured using a value converted into digital data via the second filtering means (2); i) eliminating the noise components from the data of blood constituents to be measured by subtracting a value obtained by reflecting a scale constant on the noise component amount calculated in the step (h) from the converted value via the first filtering means (1) to obtain a value of the noise-eliminated blood constituents; j) calculating a concentration of blood constituents to be measured using the value of the noise-eliminated blood constituents; and k) displaying the calculated concentration on the display means (82). The non-invasive diagnostic device of claim 10, wherein the optimal diagnosis point detecting method and the blood constituent concentration calculating method performed by the central processing means (80) comprises: a) operating the first driving means (40) by applying a predetermined signal thereto; b) converting the output signal from the first amplifying means (46) into a digital detected value using the A/D, converting means (68) by applying a control signal to the multiplexing means (66) and inputting the output signal from the first amplifying means (46) into the A/D converting means (68); c) comparing the digital detected value with a predetermined reference value, moving a detection point and then returning to the step (b) if the digital detected value is smaller than the predetermined reference value, and proceeding to a subsequent step if the digital detected value is greater than or equal to the predetermined reference value; d) replacing the reference value with the digital detected value; e) displaying the digital detected value on the display means (82); f) determining whether the number of detections is greater than or equal to a predetermined number, moving a detection point and then returning to the step (b) if the number of detections is smaller than the predetermined number, and proceeding to a subsequent step if the number of detections is greater than or equal to the predetermined number; g) displaying the digital detected value and displaying an indication that the digital detected value is a maximum value; h) operating the second driving means (42) by applying a predetermined signal thereto when an optimal diagnosis point is detected by the steps (b) through (g); i) sequentially inputting a plurality of signals amplified by the second amplifying means (3) into the A/D converting means (68) by applying a control signal to the multiplexing means (66), converting the plurality of signals amplified by the second amplifying means (3) into digital data, and storing the converted data in the storage means (78); j) inputting a plurality of signals amplified by the third amplifying means (4) into the A/D converting means (68) by applying a control signal to the multiplexing means (66), converting the plurality of signals amplified by the third amplifying means (3) into digital data, and storing the converted data in the storage means (78); k) calculating an amount of noise components other than the components to be measured using the value converted into digital data via the second filtering means (3); l) eliminating the noise components from the data of blood constituents to be measured by subtracting a value obtained by reflecting a scale constant on the noise component amount calculated in the step (k) from the converted value via the first filtering means (1) to obtain a value of the noise eliminated blood constituents; m) calculating a concentration of blood constituents to be measured using the value of the noise-eliminated blood constituents; and h) displaying the calculated concentration on the display means (82). The non-invasive diagnostic device as claimed in any of claims 10 to 12, wherein each of the first and second light emitting means is a laser diode, an emitting diode, and/or a lamp for generating the light of wide-band frequency. The non-invasive diagnostic device of any of claims 10 to 12, wherein the first and second light emitting means area flash lamp for generating pulsating light and/or a continuous emitting bulb for emitting continuous light.

Inventors: KIM HONG-SIG, KIM WON-KY, LEE SANG-MIN, YOON GIL-WON, KIM, HONG-SIG, KIM, WON-KY, LEE, SANG-MIN, YOON, GIL-WON
Applicants: SAMSUNG ELECTRONICS CO LTD, SAMSUNG ELECTRONICS CO., LTD.
Application year: 1997
Main classification: A61B5
IPC codes: A61B5, A61B8