CN110558956B - Vital sign monitoring device - Google Patents
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- CN110558956B CN110558956B CN201910773677.1A CN201910773677A CN110558956B CN 110558956 B CN110558956 B CN 110558956B CN 201910773677 A CN201910773677 A CN 201910773677A CN 110558956 B CN110558956 B CN 110558956B
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- 239000013307 optical fiber Substances 0.000 claims abstract description 75
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- 238000000605 extraction Methods 0.000 claims description 16
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- 238000004891 communication Methods 0.000 claims description 8
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
- A61B5/02427—Details of sensor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/0816—Measuring devices for examining respiratory frequency
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- Biophysics (AREA)
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- Engineering & Computer Science (AREA)
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- Physiology (AREA)
- Pulmonology (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
The invention provides a vital sign monitoring device, which monitors vital sign information based on the bending loss principle, can reduce optical phase fading and polarization influence, and is more accurate in monitoring vital signs such as respiration and heartbeat signals; by arranging the small-core optical fiber, the optical fiber bending change is caused by tiny vibration caused by extrusion caused by respiration and heartbeat, the optical signal can be obviously intensity-modulated in the small-core optical fiber with more sensitive bending loss, the optical power which is changed along with the respiration and heartbeat relativity is output at the output end of the sensing optical fiber, the sensitivity is higher, and the accuracy is better; the arrangement of the hard wire can play a role in sensitization.
Description
Technical Field
The invention relates to the field of human body vital sign monitoring, in particular to a vital sign monitoring device.
Background
With the development of social and economic technologies and the improvement of requirements of people on living quality, the demand of people on self health detection is continuously increased. The respiratory rate and the heart rate are the most basic vital signs of a human body, and the pathological signs of the human body are often reflected from abnormal respiratory rate and heart rate, so that the realization of daily real-time monitoring of the respiratory rate and the heart rate has important significance for human health assessment and disease prevention. The health state of a monitored person can be mastered by real-time monitoring through long-time respiration rate and heartbeat monitoring, but most of the traditional monitoring systems use contact wearable equipment, so that the user experience is poor, the life of the monitored person is interfered during monitoring, and the accuracy of the monitoring effect is limited.
In recent years, contactless monitoring systems have developed rapidly. The sensing system based on the optical fiber sensing principle has the characteristics of high sensitivity, good comfort and electromagnetic interference resistance, but the monitoring device based on the optical fiber grating sensor at present has complex system structure and manufacturing process, and the acquired signals need to be subjected to wavelength demodulation, so that the system cost is overhigh and the demodulation method is complex. The monitoring system based on the interference principle is required to be subjected to phase demodulation, so that the demodulation method is complex, the system cost is high, or the interference signal is extremely easy to be influenced by environment, polarization and phase fading, and the complete respiration and heartbeat signals cannot be accurately extracted.
The detection system based on the optical fiber bending loss principle can reduce the optical phase fading and polarization influence, and is more accurate in monitoring vital signs such as respiration and heartbeat signals, however, due to the fact that extrusion signals of the sensing optical fiber caused by respiration and heartbeat are weak, the extrusion signals need to be further improved, and the monitoring accuracy is improved.
Disclosure of Invention
In view of this, the invention provides a vital sign monitoring device with high real-time accuracy.
The technical scheme of the invention is realized as follows: the invention provides a vital sign monitoring device, which comprises a laser light source (1), a pressure-sensitive device (2), a photoelectric conversion module (3) and a vital sign signal extraction and analysis module (4), wherein the pressure-sensitive device (2) comprises a sensing optical fiber (21), the core diameter of the sensing optical fiber (21) is less than or equal to 5 mu m, wherein,
a laser light source (1) that emits laser light to the sensing optical fiber (21);
the sensing optical fiber (21) is respectively connected with the laser light source (1) and the photoelectric conversion module (3), and is bent after being subjected to external pressure, and an optical signal transmitted in the sensing optical fiber (21) is lost at a bent part and modulated;
the photoelectric conversion module (3) is connected with the vital sign signal extraction and analysis module (4) and converts the optical signal into an electric signal;
and the vital sign signal extraction and analysis module (4) extracts vital sign information from the electric signal.
In addition to the above technical means, preferably, the core diameter of the sensing fiber (21) is 5 μm.
On the basis of the above technical solution, preferably, the sensing fiber (21) is a single mode fiber.
On the basis of the above technical solution, preferably, the vital sign information includes a respiratory rate and a heart rate.
Based on the above technical solution, preferably, the laser light source includes, but is not limited to, a coherent light source.
On the basis of the technical scheme, preferably, still include bluetooth communication module (5) and intelligent terminal (6), bluetooth communication module (5) are connected vital sign signal respectively and are drawed and analysis module (4) and intelligent terminal (6), and intelligent terminal (6) show vital sign information that vital sign signal drawed and analysis module (4) obtained to send warning information when vital sign information surpasss the default.
On the basis of the technical scheme, preferably, the pressure-sensitive device (2) further comprises a film (22) and a hard wire (23), the sensing optical fiber (21) is arranged on the surface of the film (22) and is routed in an S shape or a spiral shape, and the hard wire (23) presses the sensing optical fiber (21) on the surface of the film (22).
More preferably, the hard wire (23) is made of hard plastics, steel wires, nylon materials or optical fibers, preferably nylon materials, and the diameter of the hard wire is 0.4-1 mm.
Preferably, the sensing optical fiber (21) comprises two S-shaped routing wires which are arranged oppositely up and down, two hard wires (23) are arranged, one hard wire is 2-3 cm away from the top end of the S-shaped routing wire on the upper side, and the diameter of each hard wire (23) is 0.6-1 mm; the other hard wire (23) is 2-3 cm away from the bottom end of the S-shaped routing wire at the lower side, and the diameter of the hard wire (23) is 0.4-0.6 mm.
On the basis of the above technical solution, preferably, the pressure-sensitive device (2) is built in but not limited to a cushion, a mattress, an insole and a pillow.
Based on the above technical solution, it is preferable that the sensing fiber (21) is subjected to the external pressure in a manner including, but not limited to, non-wearable and non-invasive.
Compared with the prior art, the vital sign monitoring device has the following beneficial effects:
(1) the vital sign information is monitored based on the bending loss principle, the sensing optical fibers are single-mode optical fibers, so that the inevitable optical phase fading and polarization influence caused by intermode interference generated when the multimode optical fibers are used can be eliminated, and the vital signs such as respiration and heartbeat signals are monitored more accurately;
(2) by arranging the small-core-diameter optical fiber, the small-core-diameter optical fiber has larger optical power change caused by bending loss, small-signal detection is facilitated, the optical fiber bending change is caused by tiny vibration caused by extrusion caused by respiration and heartbeat, the optical signal can be obviously intensity-modulated in the small-core-diameter optical fiber with more sensitive bending loss, the optical power changing along with the respiration and heartbeat correlation is output at the output end of the sensing optical fiber, the sensitivity is higher, and the accuracy is better;
(3) the arrangement of the hard wire can play a role in sensitization;
(4) the vital sign monitoring device has the advantages of simple structure, easy realization, low manufacturing cost, reliable operation, high sensitivity, real-time detection, easy signal demodulation and the like, can be arranged in daily necessities such as a cushion, a mattress, an insole or a pillow and the like, is convenient for a user to monitor the physical condition of the user in real time in daily work and life, and can inform family members and medical care personnel in time in emergency, thereby avoiding the occurrence of accidents.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a vital signs monitoring device according to the invention;
FIG. 2 is a schematic diagram of optical signal modulation based on bend loss principle;
FIG. 3 is a schematic diagram of the bending loss of a small core fiber;
FIG. 4 is a schematic diagram of the construction of the pressure sensitive device portion of the vital signs monitoring device of the present invention;
FIG. 5 is a graph of the heartbeat and respiration waveforms obtained in examples 1 to 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the vital sign monitoring device of the present invention includes a laser light source 1, a pressure sensitive device 2, a photoelectric conversion module 3, a vital sign signal extraction and analysis module 4, a bluetooth communication module 5, and an intelligent terminal 6.
Wherein, the laser light source 1 emits laser to the sensing optical fiber 21. Preferably, the laser light source includes, but is not limited to, a coherent light source, which may be a part of the prior art.
And the pressure-sensitive device 2 monitors the external pressure and modulates and outputs the optical signal based on the bending loss principle. As shown in fig. 4, it includes a sensing fiber 21, a film 22 and a hard wire 23.
The sensing optical fiber 21 is respectively connected with the laser light source 1 and the photoelectric conversion module 3, and is bent after being subjected to external pressure, and an optical signal transmitted in the sensing optical fiber 21 is lost at a bent part and modulated. The principle of optical signal modulation using bending loss principle is as follows:
as shown in fig. 2, when light energy transmitted through the core of the optical fiber propagates through a flat optical fiber, total reflection occurs in the core due to the difference in refractive index between the core and the cladding, and the energy loss in the optical fiber is extremely small. When the optical fiber is bent, the refractive index inside the optical fiber is not uniform, the total reflection condition is damaged, partial light energy is easy to leak from the cladding to cause energy loss, and the bending degree of the optical fiber can be calculated by monitoring the energy loss of light in the transmission process.
Based on the principle, the inventor finds through repeated experiments that the core diameter of the common single-mode optical fiber is 9 μm, only a small part of optical power in the optical fiber leaks in the bending process, the dynamic response on the optical power is not obvious, and the optical fiber is difficult to be directly suitable for detecting small signals such as respiration and heart rate. And the smaller core diameter is due to the narrower path of light, as shown in fig. 3, for the optical fiber with the same length, the total reflection points of the light beam propagating in the optical fiber with the small core diameter are increased obviously, which means that the points of light leaking to the cladding are increased after being bent by force, and meanwhile, the uneven influence of the bending extrusion and stretching on the refraction of the optical fiber is larger, so that the total reflection condition is easier to destroy, the optical power loss is larger, that is, the dynamic response amplitude of the optical power to the bending is larger, and the optical power detection method can be completely suitable for small signal detection.
Based on the above findings, the sensing fiber 21 used in the present invention has a core diameter of 5 μm or less, and preferably, the core diameter of the sensing fiber 21 is 5 μm. Because the sensing optical fiber 21 is a small-core optical fiber, the optical fiber bending change is caused by the tiny vibration caused by the extrusion caused by respiration and heartbeat, the optical signal can be obviously intensity-modulated in the small-core optical fiber with more sensitive bending loss, and the optical power which is changed along with the respiration and heartbeat correlation is output at the output end of the sensing optical fiber.
And a thin film 22 supporting the sensing optical fiber 21. The sensing optical fiber 21 is disposed on the surface of the film 22 and is routed in an "S" shape or a spiral shape.
The film 22 is a plane structure, the sensing fiber 21 is not bent obviously when being subjected to external pressure, and preferably, the hard wire 23 presses the sensing fiber 21 on the surface of the film 22. The external pressure is transmitted to the sensing optical fiber 21 through the hard wire 23, a plurality of positions of the sensing optical fiber 21 are subjected to pressure bending, and a plurality of bending positions are arranged, so that the sensitivity is higher. Specifically, the hard wire 23 is made of nylon, has a diameter of 0.6-1 mm, and can be specifically selected according to the luminous flux in the optical fiber. Specifically, the sensing optical fiber 21 comprises two S-shaped routing lines which are respectively arranged oppositely up and down, two hard lines 23 are arranged, one of the hard lines is 2-3 cm away from the top end of the S-shaped routing line on the upper side, and the diameter of the hard line 23 is 0.6-1 mm; the distance between the other hard wire 23 and the bottom end of the S-shaped routing wire on the lower side is 2-3 cm, and the diameter of the hard wire 23 is 0.4-0.6 mm.
The photoelectric conversion module 3 is connected with the vital sign signal extraction and analysis module 4, converts the optical signal into an electrical signal, and can adopt the prior art.
The vital sign signal extraction and analysis module 4 extracts vital sign information from the electrical signal, which can adopt the prior art. Specifically, the vital sign information includes a respiratory rate and a heart rate. Of course, the pulse frequency is also possible.
And the Bluetooth communication module 5 is respectively connected with the vital sign signal extraction and analysis module 4 and the intelligent terminal 6.
And the intelligent terminal 6 is used for displaying the vital sign information obtained by the vital sign signal extraction and analysis module 4 and sending warning information when the vital sign information exceeds a preset value.
The pressure sensitive device 2 of the present invention may be built into, but is not limited to, cushions, mattresses, insoles and pillows. Preferably, the mattress is arranged in the mattress, when the breathing of the human body causes the expansion and contraction of the thoracic cavity of the human body, which leads to the extrusion of the sensing optical fiber, the heartbeat can cause the micro-vibration of the artery vessel of the whole body of the human body, and the micro-vibration can also cause the extrusion of the sensing optical fiber 21.
In particular, the sensing fiber 21 is exposed to the external pressure in a manner including, but not limited to, non-wearable and non-invasive.
The vital signs monitoring device of the present invention will be described with reference to specific embodiments.
Example 1
The vital sign monitoring device of this embodiment, it includes laser light source 1, pressure sensitive device 2, photoelectric conversion module 3, vital sign signal extraction and analysis module 4, bluetooth communication module 5 and intelligent terminal 6. The laser light source 1, the photoelectric conversion module 3, the vital sign signal extraction and analysis module 4, the Bluetooth communication module 5 and the intelligent terminal 6 adopt the prior art, and the difference lies in the setting of the pressure-sensitive device 2.
The pressure-sensitive device 2 of the embodiment comprises a sensing optical fiber 21 and a film 22, wherein the diameter of the sensing optical fiber 21 is 9 μm, and the sensing optical fiber 21 is arranged on the surface of the film 22 and is routed in an "S" shape or a spiral shape.
Example 2
The vital signs monitoring device of this embodiment is substantially the same as in embodiment 1, except that the sensing fiber 21 has a diameter of 5 μm.
Example 3
The vital sign monitoring device of the present embodiment is substantially the same as that of embodiment 2, except that the sensing optical fiber 21 includes two sections of S-shaped wires, which are respectively disposed in an up-down opposite manner, two hard wires 23 are provided, one of the two hard wires is 2.5cm away from the top end of the S-shaped wire on the upper side, and the diameter of the hard wire 23 is 1 mm; another hard wire 23 is 2.5cm away from the bottom end of the S-shaped routing wire at the lower side, and the diameter of the hard wire 23 is 0.4 mm.
The pressure-sensitive devices 2 of examples 1 to 3 were laid flat in a mattress, and the same tester was used to lay flat in the area of the mattress where the pressure-sensitive device 2 was located, and the respiration rate and the heartbeat rate were monitored by the vital sign signal extraction and analysis module 4, and the results shown in fig. 5 were obtained.
As can be seen from FIG. 5, the heartbeat and respiration signals of the 9 μm core fiber are relatively random and cannot be distinguished; the 5-micron core diameter optical fiber can see an obvious respiration signal, and a heartbeat signal is not obvious; after the 5-micrometer core diameter optical fiber is added with the hard wire, respiration and heartbeat signals are very easy to distinguish, and the subsequent data processing is greatly facilitated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a vital sign monitoring devices based on optic fibre bending loss principle, its includes laser light source (1), pressure sensitive device (2), photoelectric conversion module (3) and vital sign signal extraction and analysis module (4), its characterized in that: the pressure-sensitive device (2) comprises a sensing optical fiber (21), the sensing optical fiber (21) adopts a single-mode optical fiber, the core diameter of the sensing optical fiber (21) is less than or equal to 5 mu m, wherein,
a laser light source (1) that emits laser light to the sensing optical fiber (21);
the sensing optical fiber (21) is respectively connected with the laser light source (1) and the photoelectric conversion module (3), and is bent after being subjected to external pressure, and an optical signal transmitted in the sensing optical fiber (21) is lost at a bent part and modulated;
the photoelectric conversion module (3) is connected with the vital sign signal extraction and analysis module (4) and converts the optical signal into an electric signal;
the vital sign signal extraction and analysis module (4) extracts vital sign information from the electric signal;
the pressure-sensitive device (2) further comprises a film (22) and a hard line (23), the sensing optical fiber (21) is arranged on the surface of the film (22) and is routed in an S shape or a spiral shape, and the hard line (23) presses the sensing optical fiber (21) on the surface of the film (22);
the hard wire (23) is made of hard plastics, steel wires, nylon materials or optical fibers, and the diameter of the hard wire is 0.4-1 mm;
the pressure-sensitive device (2) is arranged in a cushion, a mattress, an insole and a pillow;
the sensing optical fiber (21) comprises two S-shaped routing lines which are respectively arranged oppositely up and down, two hard lines (23) are arranged, one hard line is 2-3 cm away from the top end of the S-shaped routing line on the upper side, and the diameter of each hard line (23) is 0.6-1 mm; the other hard wire (23) is 2-3 cm away from the bottom end of the S-shaped routing wire at the lower side, and the diameter of the hard wire (23) is 0.4-0.6 mm.
2. The optical fiber bend loss based vital signs monitoring device of claim 1, wherein: the vital sign information includes a respiratory rate and a heart rate.
3. The optical fiber bend loss based vital signs monitoring device of claim 1, wherein: the laser light source includes a coherent light source.
4. The optical fiber bend loss based vital signs monitoring device of claim 1, wherein: still include bluetooth communication module (5) and intelligent terminal (6), vital sign signal extraction and analysis module (4) and intelligent terminal (6) are connected respectively in bluetooth communication module (5), and intelligent terminal (6) are shown the vital sign information that vital sign signal extraction and analysis module (4) obtained to send warning information when vital sign information surpasss the default.
5. The optical fiber bend loss based vital signs monitoring device of claim 1, wherein: the sensing optical fiber (21) bears the external pressure in a non-wearable mode and a non-invasive mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111067497A (en) * | 2019-12-26 | 2020-04-28 | 武汉凯锐普信息技术有限公司 | Layered structure's vital sign monitoring devices |
| CN110974198B (en) * | 2020-01-03 | 2021-01-08 | 武汉理工大学 | Wearable vital sign monitoring device and method |
| CN112294275B (en) * | 2020-10-26 | 2023-10-03 | 合肥健天电子有限公司 | Vital sign monitoring system and method based on optical fiber sensor |
| US11896351B2 (en) | 2020-10-29 | 2024-02-13 | Hong Kong Applied Science and Technology Research Institute Company Limited | Microbending fiber-optic sensor for vital sign monitoring and co-extraction of respiration and heartrate |
| CN113080899A (en) * | 2021-04-09 | 2021-07-09 | 武汉理工大学 | Intelligent vital sign monitoring mattress and monitoring system |
| CN113588066A (en) * | 2021-07-22 | 2021-11-02 | 武汉理工大学 | Micro-vibration sensing device based on macro-bending effect of weak light guide fiber |
| CN113693577B (en) * | 2021-08-09 | 2022-04-29 | 武汉理工大学 | Fetal heart monitoring and supporting abdominal belt based on optical fiber sensing |
| CN114543968B (en) * | 2022-01-26 | 2023-05-26 | 武汉理工大学 | Optical fiber bending vibration sensing method and device |
| CN117064343B (en) * | 2023-10-11 | 2023-12-19 | 汉达科技发展集团有限公司 | Intelligent AR polarization detection data processing method capable of detecting vital signs |
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Address after: 430000 No. 501-2-4, 1 / F, building 5, phase VI, optics valley software park, west of phase I and south of Nanhu South Road, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: Wuhan Kai Ruipu Medical Technology Co.,Ltd. Address before: 430000 No. 501-2-4, 1 / F, building 5, phase VI, optics valley software park, west of phase I and south of Nanhu South Road, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee before: WUHAN KAIRUIPU INFORMATION TECHNOLOGY Co.,Ltd. |