CN109394185B - Blood vessel sensing device with correction function - Google Patents
Blood vessel sensing device with correction function Download PDFInfo
- Publication number
- CN109394185B CN109394185B CN201811402306.4A CN201811402306A CN109394185B CN 109394185 B CN109394185 B CN 109394185B CN 201811402306 A CN201811402306 A CN 201811402306A CN 109394185 B CN109394185 B CN 109394185B
- Authority
- CN
- China
- Prior art keywords
- signal
- blood vessel
- analog
- circuit
- processing circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a blood vessel sensing device with a correction function, which comprises an analog processing circuit, a signal generating circuit and a direct current voltage detection circuit. The analog processing circuit is provided with a light sensing module. A photosensitive component of the optical sensing module generates an analog signal including a skin characteristic signal and a blood vessel characteristic signal according to a reflected light signal. The skin characteristic signal and the blood vessel characteristic signal respectively correspond to the skin characteristic and the blood vessel characteristic of the user. The signal generating circuit is electrically connected to the analog processing circuit for converting the analog signal into a compensation signal. The direct-current voltage detection circuit is electrically connected with the signal generating circuit. The DC voltage detection circuit compensates the analog processing circuit according to the compensation signal to reduce the skin characteristic signal in the analog signal.
Description
This application is a divisional application at 201510400468.4, filed on filing date 2015, 7/9, application No. 201510400468.4 and the invention creates a vascular sensing device entitled with calibration functionality.
Technical Field
The invention relates to the technical field of blood vessel sensing, in particular to a blood vessel sensing device with a correction function.
Background
With the progress of science and technology, sports, fitness and health care related products are developed along with the development trend of wearing type devices. The wearable device has the characteristics of lightness and convenience, and is convenient for a user to carry about so as to operate the application program at any time. Since the wearable device is attached to the surface tissue of the human body, such as the wrist, the wearable device can also be provided with a biometric sensor for monitoring the physiological and/or psychological condition of the user at any time. For example, the biometric sensor may be a blood vessel sensor, and the wearable device detects parameters of the heart rhythm data, the breathing rhythm, and the like of the user by using the blood vessel sensor, and displays the parameters on a screen for the user to refer to. However, since the blood vessel tissue is deeply buried under the skin surface layer, different users may have different skin colors, skin roughness, or sebum layer thicknesses, and the accuracy of the conventional blood vessel sensor is not good, it is difficult to effectively distinguish the differences of the skin surface layer characteristics and correctly filter out the required blood vessel characteristic parameters.
Disclosure of Invention
The invention mainly aims to provide a blood vessel sensor, aiming at solving the technical problem of poor accuracy of the traditional blood vessel sensor.
In order to achieve the above object, the present invention provides a blood vessel sensing device with calibration function, comprising:
an analog processing circuit, having a light sensing module, a light sensing component of the light sensing module generating an analog signal including a skin characteristic signal and a blood vessel characteristic signal according to a reflected light signal, wherein the skin characteristic signal corresponds to a skin characteristic of a user, and the blood vessel characteristic signal corresponds to a blood vessel characteristic of the user;
a signal generating circuit, electrically connected to the analog processing circuit, for converting the analog signal into a compensation signal; and
a DC voltage detection circuit electrically connected to the signal generation circuit, the DC voltage detection circuit compensating the analog processing circuit according to the compensation signal to reduce the skin characteristic signal in the analog signal;
the light sensing module is also provided with a switch and a charging capacitor, the switch is electrically connected among the charging capacitor, the light sensing component and the signal generating circuit, and the direct-current voltage detection circuit changes the gate voltage of the switch to control the charging degree of the charging capacitor, so as to compensate the analog processing circuit.
Preferably, the dc voltage detection circuit turns on the switch to charge the charging capacitor, thereby subtracting a dc voltage value to reduce the skin characteristic signal in the analog signal.
Preferably, the switch is an nmos, a pmos or a pass gate.
When the blood vessel sensing device detects surface tissues with different skin colors, the blood vessel sensing device can automatically deduct redundant interference voltage values of the tissue surface layer caused by skin characteristic signals, and improve the proportion of the blood vessel characteristic signals in analog signals at the output end of the analog processing circuit. The invention uses the direct current voltage detection circuit to dynamically correct the analog processing circuit, and the analog processing circuit outputs the analog signal only by deducting the skin characteristic signal in advance, so the data volume of the analog signal can be greatly reduced, the operation/conversion specification requirements of other electronic components in the blood vessel sensing device are reduced, and the blood vessel sensing device has the advantages of low power consumption, small area and high sensing precision.
Drawings
FIG. 1 is a schematic view of a blood vessel sensing device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a blood vessel sensing device according to a second embodiment of the present invention;
FIG. 3 is a schematic view of a blood vessel sensing device according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic view of a blood vessel sensing device 10 according to a first embodiment of the present invention. The blood vessel sensing device 10 includes an analog processing circuit 12, a signal generating circuit 14, and a DC voltage detecting circuit 16. The blood vessel sensing device 10 is usually applied to a smart phone, a smart watch or other wearable platform, and utilizes the analog processing circuit 12 to sense the surface tissue of the user (human body to be measured) by the non-invasive light sensing technology to generate a corresponding analog signal, and the analog signal includes both the skin characteristic signal of the tissue surface layer and the blood vessel characteristic signal of the tissue bottom layer. Wherein the skin characteristic signal corresponds to a skin characteristic of the user, such as skin tone or roughness; the blood vessel characteristic signal corresponds to the blood vessel characteristic of the user, such as the blood vessel contraction variation. For the blood vessel sensing device 10, the skin characteristic signal in the analog signal is redundant noise.
According to the difference of race and/or living habits, different users have different skin characteristic signals, for example, the skin characteristic signal of a dark skin color user accounts for a larger proportion of the analog signal, and the skin characteristic signal of a light skin color user accounts for a smaller proportion of the analog signal. If the ratio of the skin characteristic signals in the analog signal obtained by the analog processing circuit 12 is too large, the blood vessel sensing device 10 will have difficulty in analyzing the blood vessel characteristic signals therein, and will not provide correct heart rate data and corresponding mood and/or stress index for the user to refer to. Therefore, the blood vessel sensing device 10 utilizes the signal generating circuit 14 to convert the analog signal of the analog processing circuit 12 into the compensation signal. When surface tissues with different skin colors are sensed, the DC voltage detection circuit 16 can dynamically compensate the analog processing circuit 12 according to the compensation signal, and deduct the skin characteristic signal in the analog signal to reduce the interference of skin color or roughness on the blood vessel sensing result.
In the first embodiment, the analog processing circuit 12 has a light sensing module 18 and a gain module 20. The light sensing module 18 can use a non-invasive light sensing technology, such as a photo-volume (photoplethysmogram) technology, to sense the light change caused by the vasoconstriction by the light signal penetrating to the bottom of the skin and generate a corresponding analog signal. For example, the light sensing module 18 includes the light sensing element 24, and a wavelength range of a light signal corresponds to a sensing range of the light sensing element 24. The optical signal is usually invisible light signal to avoid noise interference of the environmental background. The light signal is transmitted to the surface tissue of the user, and the photosensitive element 24 is capable of generating a photosensitive signal according to a reflected light signal formed by the light signal on the surface tissue of the user. Wherein the photosensitive signal contains corresponding parameters of the skin characteristic signal and the blood vessel characteristic signal of the user.
The gain module 20 is electrically connected between the optical sensing module 18 and the signal generating circuit 14, and is used for amplifying the light sensing signal of the optical sensing module 18 and generating a corresponding analog signal from the output end of the analog processing circuit 12; the signal generating circuit 14 is electrically connected between the analog processing circuit 12 and the dc voltage detecting circuit 16 for converting the analog signal of the analog processing circuit 12 into a compensation signal for the dc voltage detecting circuit 16. The signal generating circuit 14 can be an analog-to-digital converter, which can convert the analog signal into a digital compensation signal. In order to reduce the interference of the skin characteristic signal to the blood vessel sensing result, the first embodiment is to provide a first switch 26 in the light sensing module 18, which is electrically connected between the light sensing element 24 and the signal generating circuit 14. The blood vessel sensing device 10 dynamically compensates the gate voltage of the first switch 26 by using the DC voltage detection circuit 16, and controls the amount of the photosensitive signal passing through the first switch 26 by changing the gate voltage. For example, the dc voltage detecting circuit 16 can be used to reduce the gate voltage of the first switch 26, reduce the flow rate of the photosensitive signal through the first switch 26, and accordingly subtract (or reduce the ratio of) the dc voltage value belonging to the skin characteristic signal, so as to completely retain the blood vessel characteristic signal required in the analog signal output by the analog processing circuit 12.
Referring to fig. 2, fig. 2 is a schematic view of a blood vessel sensing device 10' according to a second embodiment of the present invention. In the second embodiment, the components with the same numbers as those in the first embodiment have the same structures and functions, and the description thereof will not be repeated. The light sensing module 18 'of the blood vessel sensing device 10' further has a second switch 28 and a charging capacitor 30, wherein the second switch 28 is electrically connected between the charging capacitor 30, the light sensing element 24 and the signal generating circuit 14. The DC voltage detecting circuit 16 changes the gate voltage of the second switch 28 to control the charging degree of the charging capacitor 30, so as to achieve the purpose of dynamically compensating the analog processing circuit 12. In detail, the dc voltage detecting circuit 16 can turn on the second switch 28 to charge the charging capacitor 30, and a portion of the photosensitive signal flows to the charging capacitor 30 through the second switch 28 when passing through the node a, i.e. the dc voltage value corresponding to the skin characteristic signal in the photosensitive signal is subtracted (or reduced in proportion). The larger the second switch 28 is turned on, the larger the value of the light-sensing signal is deducted, and the analog signal at the output of the analog processing circuit 12 can completely retain (or retain a large proportion of) the important blood vessel characteristic signal.
Referring to fig. 3, fig. 3 is a schematic view of a blood vessel sensing device 10 ″ according to a third embodiment of the present invention. In the third embodiment, the components having the same numbers as those in the previous embodiments have the same structures and functions, and the description thereof will not be repeated. The gain module 20' amplifies the blood vessel characteristic signal and the skin characteristic signal synchronously. In order to reduce redundant skin characteristic signals from the analog signals, the third embodiment is to provide a compensation capacitor 32 in the gain module 20 ', and the blood vessel sensing device 10 ″ utilizes the dc voltage detection circuit 16 to change the compensation voltage value of the compensation capacitor 32, thereby controlling the gain of the gain module 20' for the analog signals. In the process of the gain of the analog signal, although the gains of the skin characteristic signal and the blood vessel characteristic signal are equivalent, the value of the skin characteristic signal can be deducted through the compensation capacitor, so that the blood vessel sensing device 10 ″ can achieve the purpose of reducing the interference of the skin characteristic signal to the blood vessel sensing result by changing the gain amount of the analog signal.
In summary, the blood vessel sensing device of the present invention can automatically deduct the redundant interference voltage value caused by the skin characteristic signal on the tissue surface layer when detecting the surface tissue with different skin colors, and increase the proportion of the blood vessel characteristic signal in the analog signal at the output end of the analog processing circuit. The direct current voltage detection circuit of the first embodiment is electrically connected to a first switch of the photosensitive component, and limits the signal flux of the first switch to deduct the direct current voltage value corresponding to the skin characteristic signal from the photosensitive signal of the photosensitive component; the dc voltage detecting circuit of the second embodiment further operates a second switch electrically connected to the charging capacitor, and determines the charging amount of the charging capacitor by adjusting the on-state of the second switch to deduct a specific dc voltage value. The switches of the first and second embodiments may be nmos transistors, pmos transistors or transmission gates. The dc voltage detecting circuit of the third embodiment achieves the purpose of subtracting or reducing the skin characteristic signal in the analog signal by controlling the gain of the gain module. Therefore, the invention uses the direct current voltage detection circuit to dynamically correct the analog processing circuit, and the analog processing circuit outputs the analog signal only by deducting the skin characteristic signal in advance, so that the data volume of the analog signal can be greatly reduced, the operation/conversion specification requirements of other electronic components in the blood vessel sensing device are reduced, and the blood vessel sensing device has the advantages of low power consumption, small area and high sensing precision.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. A blood vessel sensing device with calibration function, comprising:
an analog processing circuit, having a light sensing module, a light sensing component of the light sensing module generating an analog signal including a skin characteristic signal and a blood vessel characteristic signal according to a reflected light signal, wherein the skin characteristic signal corresponds to a skin characteristic of a user, and the blood vessel characteristic signal corresponds to a blood vessel characteristic of the user;
a signal generating circuit, electrically connected to the analog processing circuit, for converting the analog signal into a compensation signal; and
a DC voltage detection circuit electrically connected to the signal generation circuit, the DC voltage detection circuit compensating the analog processing circuit according to the compensation signal to reduce the skin characteristic signal in the analog signal;
the light sensing module is also provided with a switch and a charging capacitor, the switch is electrically connected among the charging capacitor, the light sensing component and the signal generating circuit, and the direct-current voltage detection circuit changes the gate voltage of the switch to control the charging degree of the charging capacitor, so as to compensate the analog processing circuit.
2. The blood vessel sensing device of claim 1, wherein the DC voltage detection circuit turns on the switch to charge the charging capacitor, thereby subtracting a DC voltage value to reduce the skin characteristic signal in the analog signal.
3. The blood vessel sensing device of claim 1, wherein the switch is an nmos, a pmos or a pass gate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410631736 | 2014-11-11 | ||
| CN2014106317369 | 2014-11-11 | ||
| CN201510400468.4A CN105581788B (en) | 2014-11-11 | 2015-07-09 | Blood vessel sensing device with calibration function |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510400468.4A Division CN105581788B (en) | 2014-11-11 | 2015-07-09 | Blood vessel sensing device with calibration function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109394185A CN109394185A (en) | 2019-03-01 |
| CN109394185B true CN109394185B (en) | 2021-04-27 |
Family
ID=55921972
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510400468.4A Active CN105581788B (en) | 2014-11-11 | 2015-07-09 | Blood vessel sensing device with calibration function |
| CN201811402306.4A Active CN109394185B (en) | 2014-11-11 | 2015-07-09 | Blood vessel sensing device with correction function |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510400468.4A Active CN105581788B (en) | 2014-11-11 | 2015-07-09 | Blood vessel sensing device with calibration function |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN105581788B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198988A (en) * | 1978-07-26 | 1980-04-22 | Nasa | Pulse transducer with artifact signal attenuator |
| WO2004052190A1 (en) * | 2002-12-10 | 2004-06-24 | Koninklijke Philips Electronics N.V. | A wearable device for bioelectrical interaction with motion artifact correction means |
| CN1600271A (en) * | 2003-09-24 | 2005-03-30 | 株式会社日立制作所 | Optical measurement apparatus and blood sugar level measuring apparatus using the same |
| CN1627916A (en) * | 2002-02-05 | 2005-06-15 | 坦西斯医药股份有限公司 | Method and apparatus for non-invasively measuring hemodynamic parameters using parametrics |
| CN102099671A (en) * | 2008-05-20 | 2011-06-15 | 大学健康网络 | Device and method for fluorescence-based imaging and monitoring |
| CN102131457A (en) * | 2008-08-29 | 2011-07-20 | 吉兰诺瓦公司 | Non-invasive method for estimating of the variation of the glucose level in the blood of a person and apparatus for carrying out the method |
| WO2012096582A1 (en) * | 2011-01-12 | 2012-07-19 | Mecsense As | Sensor device for sensing body fluid density and/or membrane resistance |
| CN102858242A (en) * | 2010-04-27 | 2013-01-02 | 艾迪完整应用有限公司 | Device for non-invasively measuring glucose |
| CN104000563A (en) * | 2011-01-24 | 2014-08-27 | 株式会社Act医疗服务 | Vessel pulse wave measurement system |
| US20140296657A1 (en) * | 2013-04-02 | 2014-10-02 | Mediguide Ltd. | Enhanced compensation of motion in a moving organ using processed reference sensor data |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6616613B1 (en) * | 2000-04-27 | 2003-09-09 | Vitalsines International, Inc. | Physiological signal monitoring system |
| US7024248B2 (en) * | 2000-10-16 | 2006-04-04 | Remon Medical Technologies Ltd | Systems and methods for communicating with implantable devices |
| US9668695B2 (en) * | 2004-08-11 | 2017-06-06 | University Of Florida Research Foundation, Inc. | Pulse oximeter probes and methods for using the same |
| CN101129260A (en) * | 2005-04-19 | 2008-02-27 | 许建平 | Device for measuring vascellum and method for implementing the same |
-
2015
- 2015-07-09 CN CN201510400468.4A patent/CN105581788B/en active Active
- 2015-07-09 CN CN201811402306.4A patent/CN109394185B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198988A (en) * | 1978-07-26 | 1980-04-22 | Nasa | Pulse transducer with artifact signal attenuator |
| CN1627916A (en) * | 2002-02-05 | 2005-06-15 | 坦西斯医药股份有限公司 | Method and apparatus for non-invasively measuring hemodynamic parameters using parametrics |
| WO2004052190A1 (en) * | 2002-12-10 | 2004-06-24 | Koninklijke Philips Electronics N.V. | A wearable device for bioelectrical interaction with motion artifact correction means |
| CN1600271A (en) * | 2003-09-24 | 2005-03-30 | 株式会社日立制作所 | Optical measurement apparatus and blood sugar level measuring apparatus using the same |
| CN102099671A (en) * | 2008-05-20 | 2011-06-15 | 大学健康网络 | Device and method for fluorescence-based imaging and monitoring |
| CN102131457A (en) * | 2008-08-29 | 2011-07-20 | 吉兰诺瓦公司 | Non-invasive method for estimating of the variation of the glucose level in the blood of a person and apparatus for carrying out the method |
| CN102858242A (en) * | 2010-04-27 | 2013-01-02 | 艾迪完整应用有限公司 | Device for non-invasively measuring glucose |
| WO2012096582A1 (en) * | 2011-01-12 | 2012-07-19 | Mecsense As | Sensor device for sensing body fluid density and/or membrane resistance |
| CN104000563A (en) * | 2011-01-24 | 2014-08-27 | 株式会社Act医疗服务 | Vessel pulse wave measurement system |
| US20140296657A1 (en) * | 2013-04-02 | 2014-10-02 | Mediguide Ltd. | Enhanced compensation of motion in a moving organ using processed reference sensor data |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105581788A (en) | 2016-05-18 |
| CN109394185A (en) | 2019-03-01 |
| CN105581788B (en) | 2019-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11000193B2 (en) | Blood pressure measurement system using force resistive sensor array | |
| US10624542B2 (en) | Circuits and methods for photoplethysmographic sensors | |
| Park et al. | A wireless magnetoresistive sensing system for an intraoral tongue-computer interface | |
| US20180238734A1 (en) | Methods and systems for modulation and demodulation of optical signals | |
| US20120016245A1 (en) | Plethysmogram sensor | |
| DE102016123440A1 (en) | Cardiac monitor systems on portable devices | |
| US10966662B2 (en) | Motion-dependent averaging for physiological metric estimating systems and methods | |
| US11071466B2 (en) | Portable device and blood pressure measurement method | |
| Chen et al. | Towards wearable and flexible sensors and circuits integration for stress monitoring | |
| Kim et al. | Multimodal analog front end for wearable bio-sensors | |
| US20200187788A1 (en) | Device for read-out of a photoplethysmography signal and a wearable sensor | |
| Lee et al. | A multi-functional physiological hybrid-sensing E-skin integrated interface for wearable IoT applications | |
| US10420492B2 (en) | Biometric sensor arrangement and method for generating a biometric signal | |
| US20190125187A1 (en) | Biosensor configuration which can detect at least two physiological features simultaneously with only two contact positions in mobile device | |
| TWI541005B (en) | Vessel sensing device with automatic amendment function | |
| US20170049344A1 (en) | Pulse wave sensor and pulse wave measurement module | |
| Boukhayma et al. | Earbud-embedded micro-power mm-sized optical sensor for accurate heart beat monitoring | |
| CN109394185B (en) | Blood vessel sensing device with correction function | |
| Park et al. | A baseline-tracking single-channel I/Q impedance plethysmogram IC for neckband-based blood pressure and cardiovascular monitoring | |
| Broeders et al. | Wearable electronic devices monitor vital signs, activity level, and more | |
| Tang et al. | A Noise-Reduced Light-to-Frequency Converter for Sub-0.1% Perfusion Index Blood SpO $ _ {\text 2} $ Sensing | |
| Rüedi et al. | Ultra low power microelectronics for wearable and medical devices | |
| Shin et al. | Two electrode based healthcare device for continuously monitoring ECG and BIA signals | |
| Hoang Long et al. | A prototype wristwatch device for monitoring vital signs using multi-wavelength photoplethysmography sensors | |
| ur Rahman et al. | A smart sensor node with smartphone based IoMT |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |