CN217611037U - Vital sign detecting device - Google Patents
Vital sign detecting device Download PDFInfo
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- CN217611037U CN217611037U CN202220736667.8U CN202220736667U CN217611037U CN 217611037 U CN217611037 U CN 217611037U CN 202220736667 U CN202220736667 U CN 202220736667U CN 217611037 U CN217611037 U CN 217611037U
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Abstract
The utility model relates to a vital sign detection device belongs to sensor technical field for solve and how to shorten the sensing optical fiber length of current microbending optic fibre BCG sensor and reduce the undulant measuring error scheduling problem that leads to of the light source output of current microbending optic fibre BCG sensor. The device includes: the optical path circulator comprises a first port, a second port and a third port, wherein the optical path circulator is connected with the light source through the first port and is connected with the optical fiber sensor through the second port; the optical fiber sensor is connected with the light reflector through a sensing optical fiber; the light reflector is used for reflecting the light reaching the light reflector back to the optical fiber sensor and then returning the light to the optical circuit circulator; a second photodetector connected to the third port; and the signal demodulation detection module is connected with the second photoelectric detector. The light reflector is utilized to enable the light waves to pass through the sensing optical fiber twice, and the length of the sensing optical fiber in the vital sign detection device can be shortened under the condition of the same sensitivity.
Description
Technical Field
The utility model relates to a sensor technical field especially relates to a vital sign detection device.
Background
The medical vital signs refer to indications for judging the severity and criticality of a patient, and the four vital signs include respiration, pulse, body temperature and blood pressure. At present, the vital sign sensing technology mainly comprises a photoplethysmography (PPG), an Electrocardiogram (ECG), a Ballistocardiogram (BCG) and the like. The PPG and ECG signals generally need to be directly contacted with the skin, electrodes are adhered to the body, patient compliance is poor, and long-term monitoring of vital sign parameters of a patient is difficult. Most of the monitoring of BCG signal need not with skin direct contact, with the sensor embedding to mattress and cushion, the patient lies down or sits and can obtain vital sign information such as heart rate, respiratory rate and sleep quality, can not cause physiological burden to the patient, receives extensive attention in recent years.
The detection method of the BCG signal mainly comprises a piezoelectric sensing method and an optical fiber sensing method. The piezoelectric sensing method senses BCG signals through a piezoelectric film, is easily interfered by external environment and only can detect dynamic force; the optical fiber sensing method is to sense BCG signals through optical fibers, and has the advantages of electromagnetic interference resistance, good safety, capability of detecting tiny static force and dynamic force and the like. According to different modulation modes of optical signals, the optical fiber BCG sensor can be divided into a BCG sensor based on microbending optical fibers, a BCG sensor based on optical fiber gratings and a BCG sensor based on optical fiber interferometers, wherein the BCG sensor based on the microbending optical fibers has the advantages of simple structure, low cost and the like. The structure of the traditional vital sign monitoring device based on the microbending optical fiber is shown in figure 1, when BCG signals act on a microbending optical fiber sensor consisting of sensing optical fibers and a grid structure, the sensing optical fibers are slightly bent, partial energy enters an optical fiber cladding layer so as to generate light intensity loss, and the BCG signals can be obtained by detecting the output light intensity of the microbending optical fiber sensor. However, the conventional microbend fiber-based vital sign monitoring device requires a long sensing fiber length and a serpentine routing for high sensitivity of the system, and the output power fluctuation of the light source can cause measurement errors.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the present invention aims to provide a vital sign detecting device for solving the problems of how to shorten the sensing fiber length of the conventional microbending fiber BCG sensor and how to reduce the fluctuation of the light source output power of the conventional microbending fiber BCG sensor, which results in the measurement error. The purpose of the utility model is mainly realized through the following technical scheme:
a vital signs detection device comprising: the optical path circulator comprises a first port, a second port and a third port, wherein the optical path circulator is connected with the light source through the first port and is connected with the optical fiber sensor through the second port; the optical fiber sensor is connected with the light reflector through a sensing optical fiber; the light reflector is used for reflecting the light reaching the light reflector back to the optical fiber sensor and then returning the light to the optical path circulator; and the second photodetector connected to the third port.
The beneficial effects of the above scheme are as follows: the utility model discloses utilize the light reflector to make the light wave pass through sensing optical fiber twice successively, compare in traditional vital sign microbend optical fiber sensing system, under the same sensitivity condition, the utility model discloses a sensing optical fiber length in the device can shorten one time.
Based on the further improvement of the scheme, the vital sign detection device further comprises a feedback control loop which is connected between the light source and the light path circulating device.
Based on the further improvement of the above scheme, the feedback control loop comprises an optical fiber coupler, a first photodetector and a light source driving module, wherein the optical fiber coupler comprises an optical input end and a first optical output end, and is connected with the light source via the optical input end; the first photodetector connected to the first light output end; and the light source driving module is connected between the light source and the first photoelectric detector.
Based on the further improvement of the above scheme, the optical fiber coupler further includes a second optical output end, wherein the optical path circulator is connected to the second optical output end, and the optical path circulator includes an optical fiber circulator or an MEMS spatial optical splitter.
Based on the further improvement of the scheme, the vital sign detection device further comprises a signal demodulation detection module which is connected with the second photoelectric detector.
Based on the further improvement of the scheme, the light reflector is an optical fiber coated total reflector or an optical fiber ring reflector.
Based on a further improvement of the above scheme, the sensing optical fiber type in the optical fiber sensor comprises a multimode optical fiber, a polarization maintaining optical fiber or a single mode optical fiber.
Based on the further improvement of the scheme, the vital sign detection device is arranged in a daily necessity, wherein the daily necessity comprises a mattress, a cushion or a pillow.
Based on the further improvement of the scheme, the optical fiber sensor comprises: the sensing optical fiber, the grid structure, the upper flexible outer cover and the lower flexible outer cover are arranged on the upper portion of the sensing optical fiber; the upper flexible outer cover is arranged above the sensing optical fiber and is in contact with the upper surface of the sensing optical fiber; and the lower flexible outer cover is arranged below the grid structure and is in contact with the lower surface of the grid structure.
Based on the further improvement of the scheme, the upper flexible outer cover and the lower flexible outer cover are made of silicon rubber.
Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:
1. the embodiment of the utility model provides an utilize the light reflector to make the light wave successively twice through sensing optical fiber, compare in the little curved optical fiber sensing system of traditional vital sign, under the same sensitivity condition, the utility model discloses a sensing optical fiber length among the vital sign detection device can shorten one time.
2. Compare in traditional vital sign microbend optical fiber sensing system, the embodiment of the utility model provides an introduce closed loop feedback control with the output of stabilizing the light source, can effectively restrain the measuring error that light source output fluctuation leads to.
The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
Fig. 1 is a schematic structural diagram of a conventional vital sign microbend optical fiber sensing system.
Fig. 2 is a functional block diagram of a vital sign detection device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a vital sign detecting device according to a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a vital sign detecting device according to a second embodiment of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
The utility model discloses a concrete embodiment discloses a vital sign detection device. With reference to fig. 2, the vital signs detection device comprises: the device comprises a light source 2, a light path circulator 5, an optical fiber sensor, a light reflector 7 and a second photoelectric detector 8. The optical path circulator 5 includes a first port, a second port, and a third port. The optical path circulator 5 is connected to the light source 2 (i.e., a broadband light source) via one port and to the optical fiber sensor via a second port. The fiber sensor (i.e., microbend fiber sensor) is connected to a light reflecting mirror 7 via a sensing fiber 6. The light reflector 7 is used to reflect the light reaching the light reflector 7 back to the optical fiber sensor and then to the optical path circulator 5. The second photodetector 8 is connected to the third port.
Compared with the prior art, in the vital sign detection device that this embodiment provided, utilize the light reflector to make the light wave pass through sensing optical fiber successively twice, compare in traditional vital sign microbending optical fiber sensing system, under the same sensitivity condition, the utility model discloses a sensing optical fiber length among the vital sign detection device can shorten one time.
Hereinafter, a vital sign detecting device according to an embodiment of the present invention will be described in detail with reference to fig. 2 to 4.
With reference to fig. 2, the vital signs detection device comprises: the device comprises a light source 2, a light path circulator 5, an optical fiber sensor, a light reflector 7, a second photoelectric detector 8, a signal demodulation detection module 9 and a feedback control loop.
The feedback control loop is connected between the light source 2 and the optical path circulator 5. The feedback control loop comprises a fiber coupler 3, a first photodetector 4 and a light source driving module 1. The optical fiber coupler 3 includes a light input end, a first light output end and a second light output end, is connected to the light source 2 via the light input end, and divides light emitted from the light source into two beams of light through the optical fiber coupler 3, wherein the first beam of light is output via the first light output end, and the second beam of light is output via the second light output end. The first photodetector 4 is connected to the first optical output; and the light source driving module 1 is connected between the light source 2 and the first photodetector 4.
The optical circuit circulator 5 is connected to the second optical output end of the optical fiber coupler 3. The optical circuit circulator 5 includes a first port, a second port, and a third port, wherein the optical circuit circulator is connected to the light source 2 via the first port and connected to the optical fiber sensor via the second port. Specifically, the second light is output via the second light output end and then input into the optical path circulator 5 via the first port of the optical path circulator 5. The optical path circulator 5 includes, for example, a fiber optic circulator or a MEMS spatial beam splitter.
The optical fiber sensor 6 is connected to the light reflecting mirror 7 via a sensing optical fiber. The sensing fiber type in the fiber sensor includes multimode fiber, polarization maintaining fiber or single mode fiber. The optical fiber sensor includes: the sensor comprises a sensing optical fiber 6, a grid structure 12, an upper flexible outer cover 11 and a lower flexible outer cover 13, wherein the grid structure 12 is laid below the sensing optical fiber; an upper flexible housing 11 disposed above the sensing optical fiber 6 and contacting an upper surface of the sensing optical fiber; and a lower flexible cover 13 disposed under the lattice structure 12 and contacting a lower surface of the lattice structure 12. The upper flexible casing 11 and the lower flexible casing 13 are made of silicone.
The light reflector 7 is used to reflect the light reaching the light reflector 7 back to the optical fiber sensor and then to the optical path circulator 5. The light reflector 7 is a fiber coated total reflector or a fiber ring reflector.
The second photodetector 8 is connected to the third port. Specifically, the second photodetector 8 is connected to the third port of the optical circuit circulator 5 to receive an optical signal and convert the received optical signal into an electrical signal.
The signal demodulation detection module 9 is connected with the second photodetector 8. The signal demodulation and detection module 9 obtains the BCG signal according to the electrical signal, and then obtains the vital sign information, specifically, the vital sign information includes a heart rate, a respiratory rate, and the like. The BCG signal is obtained according to the electric signal, and then vital sign information such as heart rate and respiratory rate is extracted from the BCG signal. Method of extracting heart rate and respiration rate from BCG signal: the heart rate of an adult is between 0.50Hz and 3.00Hz, the respiratory rate is between 0.16Hz and 0.50Hz, and other noise is suppressed by using a band-pass filter, so that heart rate or respiratory rate information is acquired.
The vital sign detection device is arranged in daily necessities, wherein the daily necessities comprise a mattress, a cushion or a pillow and the like.
Hereinafter, a vital sign detecting device according to an embodiment of the present invention will be described in detail by way of specific examples with reference to fig. 2 to 4.
Referring to fig. 2, the utility model provides a vital sign detecting device, which comprises a light source driving module 1, a light source 2, an optical fiber coupler 3, a first photoelectric detector 4, a light path circulating device 5, a microbend optical fiber sensor, a light reflector 7, a second photoelectric detector 8, a signal demodulation detecting module 9 and a BCG signal 10; the microbend optical fiber sensor is composed of a sensing optical fiber 6 and a grid structure.
The light source driving module 1, the light source 2, the optical fiber coupler 3 and the first photoelectric detector 4 are connected to form a closed loop; the light source driving module 1 is connected with the light source 2; the light source 2 is connected with the optical fiber coupler 3; the optical fiber coupler 3 is connected with the first photoelectric detector 4; the first photoelectric detector 4 is connected with the light source driving module 1; the optical path circulator 5 is provided with three ports which are respectively connected with the optical fiber coupler 3, the second photoelectric detector 8 and the microbend optical fiber sensor; the microbend optical fiber sensor is connected with the light reflector 7; the second photoelectric detector 8 is connected with the signal demodulation detection module 9; the BCG signal 10 acts on the microbend fibre optic sensor.
Hereinafter, with reference to fig. 2 to 4, the principle of the vital sign detection device according to the present invention will be described in detail.
Referring to fig. 2, light emitted from a light source 2 is divided into two beams of light by an optical fiber coupler 3 (the ratio is from 1. Another beam of light split from the optical fiber coupler 3 enters the optical path circulator 5, enters the microbend optical fiber sensor after being output from the optical path circulator 5, reaches the light reflector 7 after being output from the microbend optical fiber sensor, is reflected back to the microbend optical fiber sensor by the light reflector 7, returns to the optical path circulator 5, and finally reaches the second photodetector 8 to convert an optical signal into an electrical signal, and the electrical signal obtains vital sign information such as heart rate and respiratory rate through the signal demodulation and detection module 9. In above-mentioned theory of operation flow, the light wave is successively twice through sensing optical fiber, compares in traditional vital sign microbend optical fiber sensing system, under the same sensitivity condition, the utility model discloses a sensing optical fiber length among the vital sign detection device can shorten one time.
The exemplary embodiment of the utility model provides a vital sign detection device of two kinds of structures, be the vital sign detection device who contains the optical fiber coating film holophote and the vital sign detection device who contains the optical fiber ring speculum respectively.
A first embodiment of the present invention provides a vital sign detecting device. As shown in fig. 3, the vital signs detection device comprises: the system comprises a light source 2, a light source driving module 1, an optical fiber coupler 3, a first photoelectric detector 4, an optical fiber circulator 5, a second photoelectric detector 8, a sensing optical fiber 6, a grid structure 12, an optical fiber coating total reflection mirror 14 and a signal demodulation detection module. In a specific implementation, parameters of devices in the vital sign detection apparatus may be set as:
light source 2: light emitting diodes are used, with a wavelength of 1550nm, 1310nm or 850nm, or other low power, low cost light sources.
Fiber coupler 3: can adopt 1 × 2 fiber coupler or 2 × 2, wherein the coupling output intensity at one end of the optical fiber coupler 3 is 1% -50%.
The sensing optical fiber 6: adopting multimode fiber, single mode fiber or polarization maintaining fiber; a grid structure is laid below the sensor, the grid is composed of interwoven fibers, and the sensing fibers and the grid structure form a microbend fiber sensor; the sensing optical fiber and the two sides of the grid structure are flexible outer covers (comprising an upper flexible outer cover 11 and a lower flexible outer cover 13), and the flexible outer covers are made of silica gel.
The optical fiber coating total reflection mirror 14: the working wavelength is 1550nm, 1310nm or 850nm, and the insertion loss is low.
The signal demodulation detection module 9: the method can be used for extracting vital sign information such as heart rate and respiratory rate.
A second embodiment of the utility model provides a vital sign detection device. As shown in fig. 4, the vital signs detector comprises: the device comprises a light source 2, a light source driving module 1, an optical fiber coupler 3, a first photoelectric detector 4, an optical fiber circulator 5, a second photoelectric detector 8, a sensing optical fiber 6, a grid structure 12, an optical fiber ring reflector 15 and a signal demodulation detection module. In specific implementation, the device parameters of the vital sign monitoring device can be set as:
light source 2: light emitting diodes are used, with a wavelength of 1550nm, 1310nm or 850nm, or other low power, low cost light sources.
Optical fiberThe coupler 3: can adopt 1 × 2 fiber coupler or 2 × 2, wherein the coupling output intensity of one end of the optical fiber coupler is 1 to 50 percent.
The sensing optical fiber 6: adopting multimode fiber, single mode fiber or polarization maintaining fiber; a grid structure is laid below the sensor, the grid is composed of interwoven fibers, and the sensing fibers and the grid structure form a microbend fiber sensor; the sensing optical fiber 6 and the grid structure 12 are provided with flexible outer covers (including an upper flexible outer cover 11 and a lower flexible outer cover 13) at two sides, and the flexible outer covers are made of silica gel.
Fiber ring mirror 15: the adopted optical fiber type is multimode optical fiber, single mode optical fiber or polarization maintaining optical fiber, and the optical fiber consists of 1 of a splitting ratio 50 × 2 or 2 × 2, and a fiber coupler.
The signal demodulation detection module 9: the method can be used for extracting vital sign information such as heart rate and respiratory rate.
To sum up, the utility model provides a vital sign detecting device. Compared with the traditional vital sign microbend optical fiber sensing system, the utility model provides a light reflector is utilized to make light wave pass through the sensing optical fiber twice, and the length of the sensing optical fiber can be shortened by one time under the condition of the same sensitivity; the utility model discloses introduce closed loop feedback control with the output of stabilizing the light source, can effectively restrain the measuring error that light source output fluctuation leads to.
The utility model discloses do not relate to any software aspect's improvement. The utility model discloses only need pass through each device that has corresponding function the embodiment of the utility model provides a connection relation connect can, wherein do not relate to the improvement in the aspect of any program software. The connection mode between the hardware devices with the corresponding functions is realized by the prior art by those skilled in the art, and is not described in detail herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. A vital sign detection device, comprising: a light source, a light path circulator, an optical fiber sensor, a light reflector, a second photoelectric detector and a signal demodulation and detection module,
the optical circuit circulator comprises a first port, a second port and a third port, wherein the optical circuit circulator is connected with the light source through the first port and connected with the optical fiber sensor through the second port;
the optical fiber sensor is connected with the light reflector through a sensing optical fiber;
the light reflector is used for reflecting the light reaching the light reflector back to the optical fiber sensor and then returning the light to the optical path circulator; and
the second photodetector is connected to the third port.
2. The vital sign detection device of claim 1, further comprising a feedback control loop connected between the light source and the optical circuit circulator.
3. The vital sign detection device of claim 2, wherein the feedback control loop comprises a fiber optic coupler, a first photodetector, and a light source drive module, wherein,
the optical fiber coupler comprises an optical input end and a first optical output end, and is connected with the light source through the optical input end;
the first photodetector connected to the first light output end; and
the light source driving module is connected between the light source and the first photoelectric detector.
4. The vital sign detection device of claim 3, wherein the fiber optic coupler further comprises a second optical output, wherein the optical circuit circulator is connected to the second optical output, and wherein the optical circuit circulator comprises a fiber optic circulator or a MEMS spatial light splitter.
5. The vital sign detection device of claim 4, further comprising a signal demodulation detection module coupled to the second photodetector.
6. The vital sign detection device of claim 3, wherein the optical reflector is a fiber coated total reflector or a fiber ring reflector.
7. The vital sign detection device of claim 6, wherein the type of sensing fiber in the fiber optic sensor comprises a multimode fiber, a polarization maintaining fiber, or a single mode fiber.
8. The vital sign detection device of claim 6, wherein the fiber optic sensor is embedded within a commodity, wherein the commodity comprises a mattress, a cushion, or a pillow.
9. The vital sign detection device of claim 6, wherein the fiber optic sensor comprises: the sensing optical fiber, the grid structure, the upper flexible housing and the lower flexible housing, wherein,
the grid structure is laid below the sensing optical fiber;
the upper flexible outer cover is arranged above the sensing optical fiber and is in contact with the upper surface of the sensing optical fiber; and
the lower flexible outer cover is arranged below the grid structure and is in contact with the lower surface of the grid structure.
10. The vital sign detection device of claim 9, wherein the upper and lower flexible housings are made of silicone.
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| CN202220736667.8U CN217611037U (en) | 2022-03-31 | 2022-03-31 | Vital sign detecting device |
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| CN202220736667.8U CN217611037U (en) | 2022-03-31 | 2022-03-31 | Vital sign detecting device |
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