CN110772236B - A pulse cutting sensor and pulse condition measuring device based on directional coupler - Google Patents
A pulse cutting sensor and pulse condition measuring device based on directional coupler Download PDFInfo
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
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Abstract
本发明公开了一种基于定向耦合器的切脉传感器及脉象测量装置，属于集成光波导领域，包括：弹性薄膜以及嵌入其内的脉搏传感单元阵列；每个脉搏传感单元包括1×2定向耦合器，以及分别与1×2定向耦合器的两个输出端相连接的两个光电探测器，分别用于检测1×2定向耦合器两个输出端的输出光强度并转换为电信号；工作时，激光经1×2定向耦合器的输入端输入，弹性薄膜贴合在腕后桡动脉搏动处，有脉搏跳动时，弹性薄膜会发生形变，使得相应位置处的脉搏传感单元内两个光电探测器的输出端输出的电信号发生变化，从而实现对脉搏的传感。本发明传感灵敏度高，无需人为定位寸关尺三部的准确位置，并且能够获取到整个桡动脉搏动处的二维脉搏信息。
The invention discloses a pulse cutting sensor and a pulse condition measuring device based on a directional coupler, belonging to the field of integrated optical waveguides, comprising: an elastic film and a pulse sensing unit array embedded in it; A coupler, and two photodetectors connected to the two output ends of the 1×2 directional coupler respectively, are used to detect the output light intensity of the two output ends of the 1×2 directional coupler and convert them into electrical signals; work When the laser is input through the input end of the 1×2 directional coupler, the elastic film is attached to the pulse of the radial artery at the back of the wrist. The electrical signal output by the output end of the photodetector changes, thereby realizing the sensing of the pulse. The invention has high sensing sensitivity, does not need to manually locate the accurate positions of the three parts of the cunguan and chi, and can acquire the two-dimensional pulse information of the entire radial artery pulse.
Description
Technical Field
The invention belongs to the field of integrated optical waveguides, and particularly relates to a pulse feeling sensor based on a directional coupler and a pulse condition measuring device.
Background
In the diagnosis of traditional Chinese medicine, "inspection", "sniffing", "inquiry" and "diagnosis" are the four most fundamental and important diagnostic methods, which are called four diagnostic methods. The pulse-taking is the pulse-taking by the "cutting" method, which is the traditional pulse-taking method that the physician observes the pulse condition through the pulse of the finger at the back of the wrist and the radial artery, thereby distinguishing the abundance or insufficiency of the zang-fu organs and the deficiency and stagnation of qi, blood, fluid and essence. From the modern biology perspective, the pulse is an oscillation of blood and a blood vessel wall caused by the blood ejection activity of the heart, and due to the influence of factors such as the dispersion of harmonic waves of different frequency components, the damping effect of the viscosity of the blood and the blood vessel wall on the pulse wave, the superposition of reflected waves generated by peripheral vessels and the like, the pulse wave is greatly changed and carries rich physiological information. However, in the traditional pulse feeling process, the subjective feeling of the doctor on the pulse condition information is relied on, so the result of pulse feeling diagnosis depends on the professional level and the working state of the doctor to a great extent, and uncertainty exists. In addition, the cun-guan-chi region of the cun-kou of the patient needs to be found first when pulse taking, which increases the requirements on the diagnosis level of doctors and reduces the diagnosis efficiency. Therefore, standardized instruments and equipment are needed to detect pulse condition information, thereby reducing the technical difficulty and misdiagnosis rate of pulse feeling in traditional Chinese medicine.
Piezoelectric sensors and piezoresistive sensors are two types of pulse condition sensors which are widely used at present. The piezoelectric sensor utilizes the piezoelectric material to generate electric charge on the surface due to the piezoelectric effect after being stressed, so that the stress is converted into an electric signal to be output, and the stress is sensed. The piezoresistive material in the piezoresistive sensor can change the resistivity due to piezoresistive effect under the action of the strain gauge deformed by force, so that the magnitude of an output electric signal is influenced, and the stress sensing is realized.
The piezoelectric sensor and the piezoresistive sensor can reduce the technical difficulty and misdiagnosis rate of pulse feeling to a certain extent, but have limitations in practical use. The output direct current response of the piezoelectric sensor is poor, and charges are easy to run out so that static measurement is difficult to carry out, so that the sensitivity is not high enough when weak pulse conditions are detected; piezoresistive materials and piezoresistive patches in piezoresistive sensors are bonded by an emulsion, which limits the accuracy, sensitivity and linearity of the piezoresistive sensor due to creep, mechanical hysteresis and nonlinearity of the emulsion. In addition, the two types of sensors still need to manually find the positions of the cun-guan-chi parts before detection, and only detect the pulse conditions at the three points, which cannot reflect the pulse condition information of the whole cun-guan-chi part.
Disclosure of Invention
Aiming at the defects and the improvement requirements of the prior art, the invention provides a pulse feeling sensor based on a directional coupler and a pulse condition measuring device, and aims to solve the problems of low sensitivity, insufficient acquired information and dependence on manual work of the conventional pulse condition sensor.
To achieve the above object, according to a first aspect of the present invention, there is provided a pulse taking sensor based on a directional coupler, comprising: the pulse sensing device comprises an elastic film and a pulse sensing unit array embedded in the elastic film;
in the pulse sensing unit array, each pulse sensing unit comprises a 1 × 2 directional coupler, a first photoelectric detector and a second photoelectric detector, wherein the first photoelectric detector and the second photoelectric detector are respectively connected with two output ends of the 1 × 2 directional coupler and are respectively used for detecting the output light intensity of the two output ends of the 1 × 2 directional coupler and converting the output light intensity into an electric signal; the input end of the 1 multiplied by 2 directional coupler is used as the input end of the pulse sensing unit, the output end of the first photoelectric detector is used as the first output end of the pulse sensing unit, and the output end of the second photoelectric detector is used as the second output end of the pulse sensing unit;
during operation, input laser is input through pulse sensing unit's input, and the elastic film laminating is in wrist back radial artery pulsation department, and when having the pulse to beat, elastic film can take place deformation because of the atress for the signal of telecommunication of two output of pulse sensing unit of relevant position department changes, thereby realizes the sensing to the pulse.
Furthermore, the elastic film is made of a flexible material which has small elastic modulus, is harmless to human bodies and is insulating, and the refractive index of the elastic film is lower than that of the input waveguide and the coupling waveguide of the 1 × 2 directional coupler in the pulse sensing unit, so that accurate and safe pulse sensing is realized; preferably, the elastic membrane is a polydimethylsiloxane membrane.
Furthermore, the area of the elastic film is larger than the area of the pulse position of the radial artery behind the wrist, so that the pulse condition information of the pulse position of the radial artery behind the wrist can be completely acquired.
Further, the first photodetector and the second photodetector are both p-i-n germanium detectors.
According to a second aspect of the present invention, there is provided a pulse condition measuring device based on the pulse feeling sensor based on the directional coupler provided by the first aspect of the present invention, comprising: the pulse-taking device comprises a laser array, an optical power splitter array, a pulse-taking sensor and an A/D conversion circuit;
the optical power divider array and the laser array are integrated together, the input end of each optical power divider in the optical power divider array is respectively connected with the output end of one laser in the laser array, and one output end of each optical power divider is respectively connected with the input end of one pulse sensing unit; the optical power divider is used for dividing one path of laser output by the laser into n paths of laser and then respectively inputting the n paths of laser into the n pulse sensing units;
the output ends of all the pulse sensing units are connected with the input end of an A/D conversion circuit, and the A/D conversion circuit is used for converting the electric signals output by all the pulse sensing units into digital signals;
the pulse feeling sensor is the pulse condition measuring device based on the pulse feeling sensor of the directional coupler provided by the first aspect of the invention, and the light splitting ratio of the optical power splitter is 1: n.
Further, the pulse measuring device provided by the second aspect of the present invention further includes a laser control circuit;
the laser control circuit is connected with each laser in the laser array and used for controlling the on-off and the power of the lasers in the laser array so as to flexibly adjust according to the actually measured spatial resolution requirement and the pulse intensity of the measured object.
Furthermore, the pulse condition measuring device provided by the second aspect of the invention further comprises a telescopic wrist guard, wherein fixing parts are arranged at two ends of the telescopic wrist guard;
the laser array, the optical power splitter array, the pulse feeling sensor and the A/D conversion circuit are all fixed in the middle of the telescopic wrist guard;
when the pulse feeling sensor works, the telescopic wrist protector is worn on the wrist of a measured object, and two ends of the telescopic wrist protector are fixed together through the fixing part, so that the pulse feeling sensor is uniformly and tightly attached to the pulse position of the radial artery behind the wrist.
Furthermore, the telescopic wrist guard has good contractibility so as to ensure that the pulse feeling sensor can be uniformly and compactly attached to the pulse position of the radial artery behind the wrist, so that the pulse feeling sensor can sense the stress change of each position of a sensing area and accurately detect pulse condition information; as a further preferred, the retractable cuff is a compressed nylon cuff.
Furthermore, the fixing parts at the two ends of the telescopic wrist band are magic tapes, and the hook surface and the hair surface of the magic tapes are respectively positioned at the two ends of the telescopic wrist band and respectively positioned at the front side and the back side.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) according to the pulse feeling sensor and the pulse condition measuring device based on the directional coupler, pulse sensing of each position of the pulse position of the radial artery behind the wrist is completed through the elastic film and the pulse sensing unit array embedded in the elastic film, and the directional coupler in the elastic film and the pulse sensing unit is high in sensitivity, so that the sensing sensitivity is high, accurate positions of cunguan and guan in three parts do not need to be manually positioned, and two-dimensional pulse information of the pulse position of the whole radial artery can be obtained. In general, the pulse condition sensor can effectively solve the problems of low sensitivity, insufficient information acquisition and dependence on manual work of the existing pulse condition sensor.
(2) The pulse feeling sensor and the pulse condition measuring device based on the directional coupler have the advantages that the volume of the directional coupler is small, correspondingly, the volume of the pulse sensing unit is small, the number of units in the pulse sensing unit array can be set to be large, and therefore the pulse feeling sensor and the pulse condition measuring device can obtain high spatial resolution.
Drawings
FIG. 1 is a schematic diagram of a pulse condition measuring device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a pulse sensing unit based on a directional coupler according to an embodiment of the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-compressed nylon wrister, 2-magic tape hair surface, 3-magic tape hook surface, 4-silicon dioxide substrate, 5-electroluminescent germanium-silicon laser, 6-optical power divider, 7-laser control circuit, 8-laser control circuit power socket, 9-polydimethylsiloxane film, 10-pulse sensing unit, 11-A/D conversion circuit, 12-A/D conversion circuit power socket, 13-A/D conversion circuit signal output port, 14-input waveguide, 15-coupling waveguide, 16-input waveguide p-i-n germanium detector, 17-coupling waveguide p-i-n germanium detector, 18-positive electrode of input waveguide p-i-n germanium detector, 19-negative electrode of input waveguide p-i-n germanium detector, 20-positive electrode of coupling waveguide p-i-n germanium detector, 21-negative electrode of coupling waveguide p-i-n germanium detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The terms "first," "second," and the like (if any) in the description and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In order to solve the problems of low sensitivity, insufficient collected information and dependence on manual work of the existing pulse condition sensor, the pulse feeling sensor based on the directional coupler provided by the invention comprises the following components as shown in figure 1: the pulse sensing device comprises an elastic film and a pulse sensing unit array embedded in the elastic film;
the elastic film is made of an insulating flexible material with small elastic modulus and no harm to a human body, and the refractive index of the elastic film is lower than that of the input waveguide and the coupling waveguide of the 1 x 2 directional coupler in the pulse sensing unit so as to realize accurate and safe pulse sensing; in the present embodiment, the elastic film is a Polydimethylsiloxane (PDMS) film 9; the area of the elastic film is larger than that of the pulse position of the radial artery behind the wrist, so that pulse condition information of the pulse position of the radial artery behind the wrist can be completely acquired;
in the pulse sensing unit array, each pulse sensing unit 10 has a structure as shown in fig. 2, and includes a 1 × 2 directional coupler, a first photodetector, and a second photodetector; as shown in fig. 2, the 1 × 2 directional coupler includes an input waveguide 14 and a coupling waveguide 15, an input end of the input waveguide 14 is an input end of the 1 × 2 directional coupler, output ends of the input waveguide 14 and the coupling waveguide 15 are two output ends of the 1 × 2 directional coupler, and a portion of parallel coupling region is between the input waveguide 14 and the coupling waveguide 15, in which input light is alternately coupled and transmitted between the two waveguides; in the embodiment, the first photoelectric detector is an input waveguide p-i-n germanium detector 16, the second photoelectric detector is a coupling waveguide p-i-n germanium detector 17, a positive electrode 18 of the input waveguide p-i-n germanium detector 16 and a negative electrode 19 of the input waveguide p-i-n germanium detector 16 jointly form an output end of the input waveguide p-i-n germanium detector 16, and a positive electrode 20 of the coupling waveguide p-i-n germanium detector 17 and a negative electrode 21 of the coupling waveguide p-i-n germanium detector 17 jointly form an output end of the coupling waveguide p-i-n germanium detector 17; the input waveguide p-i-n germanium detector 16 is connected with the output end of the input waveguide 14, the coupling waveguide p-i-n germanium detector 17 is connected with the output end of the coupling waveguide 15, and the input waveguide p-i-n germanium detector 16 and the coupling waveguide p-i-n germanium detector 17 are respectively used for detecting the output light intensity of the two output ends of the 1 x 2 directional coupler and converting the output light intensity into an electric signal; the input end of the 1 multiplied by 2 directional coupler is used as the input end of the pulse sensing unit, the output end of the input waveguide p-i-n germanium detector 16 is used as the first output end of the pulse sensing unit, and the output end of the coupling waveguide p-i-n germanium detector 17 is used as the second output end of the pulse sensing unit;
when the pulse sensor works, input laser is input through the input end of the pulse sensing unit, the elastic film is attached to the pulse position of the radial artery behind the wrist, when a pulse beats, the elastic film can deform due to stress, so that the distance between the input waveguide 14 and the coupling waveguide 15 can change in the coupling area of the 1 x 2 directional coupler in the pulse sensing unit at the corresponding position, the light intensity of the two output ends of the 1 x 2 directional coupler is finally influenced, and the electric signal obtained by converting the two output light intensities by the p-i-n germanium detector can also change, thereby realizing the sensing of the pulse.
For implementation, when the pulse-taking sensor based on the directional coupler operates, the wavelength of input laser can be selected to be 1550nm, the band is a standard communication band in commercial use, and mature optical devices such as the directional coupler, the laser, the optical power splitter, the photoelectric detector and the like matched with the band are provided.
It should be understood that, for the purpose of explaining the structure and implementation principle of the pulse feeling sensor, fig. 1 only shows a part of the sensing units in the pulse sensing unit array, and ". quadrature." indicates that the part is omitted, and the spatial resolution and the measurement area of the pulse feeling sensor depend on the number of the pulse sensing units in the specific application.
As shown in fig. 1, the pulse condition measuring device according to the present invention includes: the device comprises a telescopic wrist guard, a laser control circuit 7, a laser array, an optical power splitter array, a pulse-taking sensor and an A/D conversion circuit 11;
wherein, the pulse feeling sensor is the pulse feeling sensor based on the directional coupler;
the optical power divider array and the laser array are integrated on the silicon dioxide substrate 4, the input end of each optical power divider 6 in the optical power divider array is respectively connected with the output end of one laser in the laser array, and one output end of each optical power divider is respectively connected with the input end of one pulse sensing unit; the light splitting ratio of the optical power divider is 1: n, and the optical power divider is used for dividing one path of laser output by the laser into n paths of laser and then respectively inputting the n paths of laser into the n pulse sensing units; in the present embodiment, the lasers in the laser array are electroluminescent ge-si lasers 5;
the output ends of all the pulse sensing units 10 are connected with the input end of an A/D conversion circuit 11, and the A/D conversion circuit 11 is used for converting the electric signals output by all the pulse sensing units 10 into digital signals; the signal output port 13 of the a/D conversion circuit 11 can be connected to a computer to output a digital signal;
the laser control circuit 7 is connected with each electroluminescent germanium-silicon laser 5 in the laser array and is used for controlling the on-off and the power of the lasers in the laser array so as to flexibly adjust according to the space resolution requirement of actual measurement and the pulse intensity of the measured object;
the telescopic wrist guard has good contractibility so as to ensure that the pulse feeling sensor can be uniformly and compactly attached to the pulse position of the radial artery behind the wrist, so that the pulse feeling sensor can sense the stress change of each position of a sensing area and accurately detect pulse condition information; in the embodiment, the telescopic wrist guard is a compressed nylon wrist guard 1; the laser array, the optical power splitter array, the pulse-taking sensor and the A/D conversion circuit 11 are all fixed in the middle of the compressed nylon wrist guard 1;
a laser control circuit power socket 8 and an A/D conversion circuit power socket 12 are also arranged on the compressed nylon wrist guard 1 and respectively supply power to the laser control circuit 7 and the A/D conversion circuit 11;
magic tapes are arranged at two ends of the compressed nylon wrist band 1 to serve as fixing components, the magic tape rough surface 2 and the magic tape hook surface 3 are respectively positioned at two ends of the compressed nylon wrist band 1 and are respectively positioned at the front side and the back side, and the magic tapes and the compressed nylon wrist band 1 together form a wrist band with adjustable tightness;
during operation, scalable wrist band is worn in measurand's wrist, and its both ends are fixed together through the magic subsides to make pulse feeling sensor evenly laminate closely behind the wrist radial artery pulse department.
The pulse feeling sensor and the pulse condition measuring device are high in sensing sensitivity and do not need to manually position the accurate positions of cunguanchi, can acquire two-dimensional pulse information of the whole pulse position of the radial artery, and can effectively solve the problems that the existing pulse condition sensor is low in sensitivity, insufficient in acquired information and dependent on manual work.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A pulse feeling sensor based on a directional coupler is applied to the field of integrated optical waveguide and is characterized by comprising: the pulse sensor comprises an elastic film and a pulse sensing unit array embedded in the elastic film;
in the pulse sensing unit array, each pulse sensing unit includes a 1 × 2 directional coupler, a first photodetector and a second photodetector, and the first photodetector and the second photodetector are respectively connected with two output ends of the 1 × 2 directional coupler, and are respectively used for detecting output light intensities of the two output ends of the 1 × 2 directional coupler and converting the output light intensities into electrical signals; the input end of the 1 × 2 directional coupler is used as the input end of the pulse sensing unit, the output end of the first photoelectric detector is used as the first output end of the pulse sensing unit, and the output end of the second photoelectric detector is used as the second output end of the pulse sensing unit;
when the pulse sensor works, input laser is input through the input end of the pulse sensing unit, the elastic film is attached to the pulse position of the radial artery behind the wrist, when pulse beats, the elastic film deforms due to stress, so that the distance between the input waveguide and the coupling waveguide in the coupling area of the 1 x 2 directional coupler in the pulse sensing unit at the corresponding position changes, and finally, electric signals output by the two output ends of the pulse sensing unit at the corresponding position change, and the pulse sensing is realized; the coupling region is a region formed by a parallel part between the input waveguide and the coupling waveguide, and input light can be alternately coupled and transmitted between the two waveguides in the coupling region.
2. The directional-coupler-based pulse-taking sensor as claimed in claim 1, wherein the elastic membrane is a polydimethylsiloxane membrane.
3. The directional coupler-based pulse feeling sensor of claim 1 or 2, wherein the elastic membrane has an area larger than an area at a pulse of a radial artery posterior to the wrist.
4. The directional-coupler-based pulse-taking sensor of claim 1 or 2, wherein the first photodetector and the second photodetector are both p-i-n germanium detectors.
5. A pulse condition measuring device based on the pulse feeling sensor based on the directional coupler of any one of claims 1 to 4, comprising: the pulse-taking device comprises a laser array, an optical power splitter array, a pulse-taking sensor and an A/D conversion circuit;
the optical power divider array and the laser array are integrated together, the input end of each optical power divider in the optical power divider array is respectively connected with the output end of one laser in the laser array, and one output end of each optical power divider is respectively connected with the input end of one pulse sensing unit; the optical power divider is used for dividing one path of laser output by the laser into n paths of laser and then respectively inputting the n paths of laser into the n pulse sensing units;
the output ends of all the pulse sensing units are connected with the input end of the A/D conversion circuit, and the A/D conversion circuit is used for converting the electric signals output by all the pulse sensing units into digital signals;
the pulse feeling sensor based on the directional coupler is the pulse feeling sensor based on the directional coupler, which is disclosed by any one of claims 1-4, and the light splitting ratio of the optical power splitter is 1: n.
6. The pulse condition measuring device of claim 5, further comprising a laser control circuit;
the laser control circuit is connected with each laser in the laser array and used for controlling the on-off and the power of the lasers in the laser array.
7. The pulse measuring device according to claim 5 or 6, further comprising a retractable wrist guard, wherein fixing parts are provided at both ends of the retractable wrist guard;
the laser array, the optical power splitter array, the pulse feeling sensor and the A/D conversion circuit are all fixed in the middle of the telescopic wrist guard;
when the pulse feeling sensor works, the telescopic wrist protector is worn on the wrist of a measured object, and two ends of the telescopic wrist protector are fixed together through the fixing part, so that the pulse feeling sensor is uniformly and tightly attached to the pulse position of the radial artery behind the wrist.
8. The pulse condition measuring device of claim 7, wherein the retractable cuff is a compressed nylon cuff.
9. The pulse measuring device according to claim 7, wherein the fixing members at both ends of the extensible cuff are hook and loop fasteners, and hook surfaces and hair surfaces of the hook and loop fasteners are respectively located at both ends of the extensible cuff and respectively located at the front side and the back side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910950071.0A CN110772236B (en) | 2019-10-08 | 2019-10-08 | A pulse cutting sensor and pulse condition measuring device based on directional coupler |
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| US5074309A (en) * | 1989-12-04 | 1991-12-24 | Sperry Marine Inc. | Device for monitoring cardiovascular signals and fiber optic coupler phonocardio sensor therefor |
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| KR100969853B1 (en) * | 2007-11-28 | 2010-07-13 | 한국 한의학 연구원 | Pulse Wave Measurement System with Arrayed Pulse Sensor |
| CN102058399B (en) * | 2009-11-18 | 2012-05-30 | 中国科学院化学研究所 | Bionic pulse feeling system based on microfluidic chip |
| KR101150860B1 (en) * | 2010-08-06 | 2012-07-19 | 한국광기술원 | Pulse Generator Using Light Sensor |
| CN102274015A (en) * | 2011-05-06 | 2011-12-14 | 天津大学 | Method and device for wrist strap type pulse signal extraction based on optical fiber vibration period analysis |
| CN104257359B (en) * | 2014-09-16 | 2016-04-06 | 苏州能斯达电子科技有限公司 | A kind of wearable flexible sensor of monitoring wrist pulse and preparation method thereof |
| CN104568219A (en) * | 2015-01-15 | 2015-04-29 | 厦门大学 | Temperature measurement device and method based on single-passband microwave photon filter |
| CN106510620A (en) * | 2016-10-19 | 2017-03-22 | 苏州安莱光电科技有限公司 | Full-optical non-contact vital sign monitoring device |
| CN106963351B (en) * | 2017-04-13 | 2019-11-01 | 清华-伯克利深圳学院筹备办公室 | A kind of Bracelet structure with pulse wave detection system |
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| US4634858A (en) * | 1984-10-17 | 1987-01-06 | Sperry Corporation | Variable coupler fiberoptic sensor |
| US5074309A (en) * | 1989-12-04 | 1991-12-24 | Sperry Marine Inc. | Device for monitoring cardiovascular signals and fiber optic coupler phonocardio sensor therefor |
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