CN201316381Y - Low oxygen saturation human body protecting training instrument - Google Patents
Low oxygen saturation human body protecting training instrument Download PDFInfo
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- CN201316381Y CN201316381Y CNU200820123637XU CN200820123637U CN201316381Y CN 201316381 Y CN201316381 Y CN 201316381Y CN U200820123637X U CNU200820123637X U CN U200820123637XU CN 200820123637 U CN200820123637 U CN 200820123637U CN 201316381 Y CN201316381 Y CN 201316381Y
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Abstract
The utility model discloses a low oxygen saturation human body protecting training instrument. The instrument comprises a casing, a key, a display screen, a sleeve strap, an inflating pump, a pressure sensor, an electromagnetic valve, a control circuit and an oxygen saturation monitor, wherein, the key and the display screen are mounted on the casing; the sleeve strap is connected with the casing; the inflating pump, the pressure sensor, the electromagnetic valve and the control circuit are mounted inside the casing; the signal output terminal of the oxygen saturation monitor is connected with one control signal input terminal of the control circuit; the pressure sensor is connected with the sleeve strap and used for detecting the pressure intensity of gas inside the sleeve strap; the detection signal output terminal of the pressure sensor is connected with the signal input terminal of the control circuit; and the control circuit carries out closed-loop control to the gas inside the sleeve strap through the inflating pump, the pressure sensor and the electromagnetic valve. According to the oxygen saturation and blood pressure of a testee, the instrument repeatedly exerts stress on the limbs of the user, and effectively isolates and blocks the blood flow of the user, thereby arousing the anti-ischemia-anoxia or ischemia-anoxia resistant potential of tissue cells of human body, and improving the capacities of human body, organs or tissues to survive and work under anoxic condition.
Description
Technical field
This utility model relates to a kind of instrument for training of protecting the ischemia organ; be particularly related to a kind of by reducing the training of limbs blood oxygen saturation; excite when injected organism tissue to ischemia, anoxybiotic tolerance potential; improve existence and the ability to work of vitals (after one's own heart, brain, kidney, liver, lung, gastrointestinal and lower limb etc.) under ischemia or hypoxia condition; thereby improve and elimination human body ischemia symptom, suppress the instrument of tumor growth.This utility model is mainly used in the reaction of prevention high altitude anoxia, prevention cardiovascular and cerebrovascular vessel incident, treatment ischemic cerebrocardiac disease, treatment diabetic foot and malignant tumor, reduce incidence rate, severe disability rate and the mortality rate of sudden death, apoplexy, diabetic foot, improve the organ transplantation success rate, suppress malignant growth, belong to the Medical Instruments technical field.
Background technology
From reported first such as Murry in 1986 repeat to press from both sides momently close coronary artery and can dwindle the long-time folder of coronary artery and close the myocardial infarction area that causes since, human body becomes the hot issue of scientific circles at once to the acquired tolerance phenomenon of ischemia.The notion of " ischemic preconditioning " is arisen at the historic moment immediately, promptly after certain organ experiences repetition, of short duration non-lethality ischemia in advance and hits, can obtain tolerance that continue, the lethal ischemia subsequently.Discover that the ischemic preconditioning phenomenon occurs at the species that comprise human nearly 75%, the organ that can produce ischemic preconditioning comprises whole body organs such as the heart, brain, liver, kidney, lung and skeletal muscle.
Discover that further the protective effect of ischemic preconditioning not only is confined to repetition ischemia organ itself, and the ischemic injuries that is far apart organ also had protective effect that the effect of prompting ischemic preconditioning has general.Repeat to block coronary artery, common carotid artery, thoracic aorta, except that strengthening the tolerance of local organs such as the heart, brain, spinal cord to ischemia respectively, also strengthen the ischemia tolerance that other is far apart the dystopy organ simultaneously, this phenomenon is called as " long-range ischemic preconditioning ".Zoopery has been found that folder closes/loosens the rat bilateral femoral arterial and can heart and cerebral ischemia subsequently be shielded.The wound that has owing to this method has limited its clinical expansion.The essence of human body ischemia is anoxia, and blood oxygen saturation decline is the important pathological process before ischemic tissue necroses.
The luxuriant professor the sixties of Capital University of Medical Sciences cerebrovascular institute Lu Kingdom takes the lead in having created in the world mice Hypoxia Preconditioning model, and the effect and the mechanism of Hypoxia Preconditioning are furtherd investigate.2005, the Hypoxia Preconditioning result of study was being summed up by my institute (Xuan Wu hospital), on the international research progress basis in conjunction with long-range ischemic preconditioning, had set up the human long-range ischemic preconditioning model that reduces the limbs blood oxygen saturation.This model has adopted intelligent LBF blocking-up to monitor the technology that combines with near-infrared.Because this method noinvasive is simple and easy to do, has broad clinical application prospect.
Summary of the invention
The purpose of this utility model provides and a kind ofly is applicable to what household person operation and medical institutions used, and safe, easy, portable low oxygen saturation human body is protected instrument for training.This instrument adopts blocking-up of intelligent LBF and near-infrared to monitor the technology that combines the oxygen saturation of experimenter's limbs is controlled at target level; Different phase according to treatment is regulated the training persistent period; Possess the blood pressure and pulse monitoring function simultaneously, safe and reliable.
For realizing above-mentioned purpose, this utility model adopts following design: a kind of low oxygen saturation human body instrument for training, it by housing, be installed in button, display screen, the cuff that links to each other with housing on the housing and be installed in the intravital inflator pump of shell, pressure transducer, electromagnetic valve, control circuit and constitute; It is characterized in that: it also includes a blood oxygen saturation monitoring instrument;
The signal output part of described blood oxygen saturation monitoring instrument links to each other with a control signal input of control circuit;
Described pressure transducer links to each other with cuff, is used to detect the pressure and the pressure oscillation ripple of gas in the cuff, and its detection signal outfan links to each other with the signal input part of control circuit;
The control signal output ends of control circuit links to each other with the control end of inflator pump by lead, and the source of the gas outfan of inflator pump communicates with the source of the gas input of cuff; Another control signal output ends of control circuit links to each other with the control end of electromagnetic valve by lead, and electromagnetic valve is connected in the exhaust channel of cuff.
This utility model is by having carried out the safety and the tolerance tests of different low oxygen saturation degree (10%-60%) of upper limb and various durations (1-8min) to 30 health volunteers (18-70 year, average 42 ± 6 years old).Basic research and clinical test results show; specific low oxygen saturation training repeatedly can induce human body to produce hypoxia inducible factor, organization protection's material and angiogenesis factor; and heart rate, blood pressure, blood glucose and the whole body oxygen saturation of receiving examination person are not had obvious influence; sense of discomfort is slight; point out the safety and the feasibility of this method, possess the clinical expansion condition.Simultaneously, in the rat body that carries out and external glioblastoma treatment result of study find that low oxygen saturation training can suppress the growth of long-range limb malignant tumor cell, the prolong rats time-to-live, point out this method preventing and treating effect in the malignant tumor.Clinical test results has shown the desirable curative effect of this Therapeutic Method.
This utility model handling safety, the patient does not have obvious limbs sense of discomfort; Ischemia protection to vitals such as altitude sickness, heart and brain has reached best prevention and therapeutic effect; Simple to operate, intellectuality, user can independently be finished.
Description of drawings
Fig. 1 is the low oxygen saturation human body instrument for training external structure sketch map of this utility model;
Fig. 2 is the low oxygen saturation human body instrument for training control circuit theory diagram of this utility model;
Fig. 3 is this utility model blood oxygen saturation monitoring instrument fundamental diagram;
Subjects's blood pressure graph that Fig. 4 utilizes oscillographic method to measure for this utility model;
Fig. 5 is this utility model control circuit physical circuit figure;
Fig. 6 is the outside drawing of differential pressure type pressure transducer.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, is not to qualification of the present utility model.
Fig. 1 is the disclosed low oxygen saturation instrument for training external structure sketch map of this utility model, and Fig. 2 is the disclosed low oxygen saturation instrument for training control circuit theory diagram of this utility model.As shown in Figure 1 and Figure 2, this low oxygen saturation human body instrument for training mainly by housing 1, be installed in button 2, display screen 3, the cuff 4 that links to each other with housing 1 on the housing 1, be installed in inflator pump 5, differential pressure type pressure transducer 6, electromagnetic valve 7, the feedback control circuit 8 in the housing 1 and be installed in the outer blood oxygen saturation detector 9 of housing and constitute.Control circuit 8 carries out closed loop control by the gas in inflator pump 5,7 pairs of cufves of electromagnetic valve 4.The control signal output ends of control circuit 8 links to each other by the control end of lead with inflator pump 5, and the source of the gas outfan of inflator pump 5 communicates with the source of the gas input of cuff 4.The startup of control circuit 8 by control inflator pump 5/or stop to give cuff 4 inflations, increases its internal gas pressure.Simultaneously, another control signal output ends of control circuit 8 links to each other by the control end of lead with electromagnetic valve 7, and electromagnetic valve 7 is connected in the exhaust channel of cuff 4, conducting by control electromagnetic valve 7 of control circuit 8/or turn-off, make cuff 4 venting, reduce its internal gas pressure.
Differential pressure type pressure transducer 6 links to each other with cuff 4, is used to detect the pressure and the pressure oscillation ripple of gas in the cuff 4, and its detection signal outfan links to each other with the signal input part of control circuit 8.Be transferred to control circuit 8 after the analog signal conversion that the A/D change-over circuit is exported pressure transducer 6 becomes digital signal, control circuit 8 is according to the gas pressure intensity in the detected cuff 4, and control inflator pump 5 starts inflates for cuff 4, increases its internal gas pressure; Or the output control signal is opened electromagnetic valve 7, makes cuff 4 venting, reduces its internal gas pressure.
The data input pin of control circuit 8 links to each other with the data output end of button 2 on being installed in housing 1 by lead, receives the various instructions of user by button 2 inputs.The data output end of control circuit 8 links to each other with the data input pin of display screen 3 on being installed in housing 1 by lead, shows various data, operation indicating symbol and information.The data I/O end of control circuit 8 links to each other with memorizer 10 by lead, reads/store data.
According to goal of the invention of the present utility model, the major function that this utility model is realized is to realize the low blood oxygen saturation quantitative training of limbs.For this reason, this utility model carries out high accuracy by the blood oxygen saturation of 9 pairs of human body far-ends of blood oxygen saturation monitoring instrument limbs and detects, and gives control circuit 8 with detected transfer of data; Control circuit 8 is according to detected data; after computing; blocking-up by air pump 5, electromagnetic valve 7, cuff 4 control LBFs; to reach significant interval blocking-up user LBF; improve anti-/ anoxia enduring potential of human body, improve the ability of under anoxia condition, surviving and working, the purpose that protection suppresses organ and anti-malignant tumor.As shown in Figure 2, the signal output part of blood oxygen saturation monitoring instrument 9 links to each other with the control signal input of control circuit 8.
This utility model realizes that the principle of the low blood oxygen saturation quantitative training of limbs is: the blood oxygen saturation monitoring instrument detects the oxygen saturation of blocking-up far-end of limb in real time, with preset oxygen protection degree value and compare, if real-time measurement values is lower than 3% when above, control circuit 8 is just opened electromagnetic valve 7 and is made cuff 4 decompressions; When if real-time measurement values is above above 3%, control circuit 8 is just connected the air pump pressurization; Otherwise keep the cuff internal gas pressure.According to the different treatment stages of selecting, be set the different hypoxia protection treatment persistent period.
As shown in Figure 3, blood oxygen saturation monitoring instrument 9 comprises infrared light supply, photodetector, signal processing circuit and A/D change-over circuit.Signal processing circuit is handled the signal from photodetector, after the amplification of signal process, the filtering, obtains the signal of certain amplitude; This signal is transferred to the single-chip microcomputer of control circuit 8 after the A/D change-over circuit is handled, single-chip microcomputer obtains blood oxygen saturation after according to blood oxygen algorithm computation.
Operation principle of the present utility model is: when user is wound into cuff of the present utility model on the limbs after (for example upper arm), opening power, control circuit is with regard to the automatic output control signal, make inflator pump work, inflate to cuff, increase its internal gas pressure, it is exerted pressure to the blood vessel in the human body limb; Simultaneously, detect the pressure of gas in the cuff in real time, and the pressure values of gas in the cuff that detects is transferred to control circuit by pressure transducer.Control circuit receives the pressure values about gas in the cuff of pressure transducer transmission, and the meansigma methods of getting nearest 3 measured values is as the atmospheric pressure value in the current cuff.Control circuit is also monitored by blood pressure, the blood oxygen saturation of 9 pairs of user of blood oxygen saturation monitoring instrument in the gas pressure intensity in the monitoring cuff in real time, and calculate the pressure value of user automatically according to data monitored, thereby the occluding pressure value of automatic setting cuff, persistent period, blanking time and the number of occurrence.When the gas pressure intensity in the cuff greater than control circuit during when above (for example the gas pressure intensity value cuff in greater than blocking-up pressure value 200mmHg) from the cuff occluding pressure value set, control circuit is exported control signal, and inflator pump is quit work, and stops to inflate to cuff; When the gas pressure intensity value in the cuff less than control circuit during (for example the gas pressure intensity value cuff in is less than blocking pressure value 200mmHg when above) from the cuff occluding pressure value set, control circuit automatic output control signal, make inflator pump work,, increase the pressure of gas in the cuff to the cuff inflation; Gas pressure intensity value in keeping cuff equals cuff occluding pressure value after a period of time (after promptly arriving the persistent period of control circuit setting), control circuit output control signal, open electromagnetic valve, bleed off the gas in the cuff, reduce its internal gas pressure, alleviate the compressing of cuff blood vessel in the human body limb.Behind the certain interval of time (after promptly arriving the blanking time of control circuit setting), control circuit repeats said process, up to reaching control circuit till the number of occurrence of setting.This utility model repeats to oppress user limbs, significant interval blocking-up user LBF by this exactly, thereby excite anti-/ anti-ischemia, the anoxia potential of when injected organism tissue cell, the ability that raising human body, organ or tissue survive and work under anoxia condition realizes utility model purpose of the present utility model.
This utility model uses oscillographic method to measure the blood pressure of user in real time.Oscillographic method need use cuff interruption artery blood flow, detects the pressure oscillation ripple of gas in the cuff in deflation course in real time by pressure transducer.The pressure oscillation ripple originates from beating of blood vessel wall, and as shown in Figure 4, when static pressure in the cuff during greater than systolic pressure, tremulous pulse is closed, the impact of cuff endogenous cause of ill near-end pulse and the tiny wave of oscillation occurs; When static pressure during less than systolic pressure, wave amplitude increases, and when static pressure equaled mean arterial pressure, ductus arteriosus wall was in load condition, and it is maximum that wave amplitude reaches; Static pressure during less than mean arterial pressure wave amplitude reduce gradually; Static pressure less than diastolic pressure after, ductus arteriosus wall is fully expanded at relaxing period, the tube wall rigidity increases, and wave amplitude is kept less level.Ripple component in the deflation course in the continuous recording pressure oscillation ripple presents approximate parabolical envelope, the key of oscillographic method be to find the envelope that charges and discharge gaseous pulse dynamic pressure Reeb and and arteriotony between relation.It mainly is to inflate in cuff by inflator pump that oscillographic method is measured blood pressure, exit at a slow speed after reaching the certain pressure value, in deflation course, pressure transducer is the signal of telecommunication with cuff internal pressure conversion of signals, the signal of telecommunication obtains the pulsating pressure waves of parabola envelope by filtering, and control circuit calculates human body systolic pressure, diastolic pressure and mean blood pressure according to the blood pressure computing formula that it has been cured.
This utility model also provides manual control function, that is to say, user can directly be set cuff occluding pressure value, persistent period, blanking time and the number of occurrence by the button on the housing 2 according to the pressure value of oneself, operates then, to satisfy the needs of individual patient.The cuff occluding pressure value that is available for users to select that this utility model is built-in is the following arbitrary value of 300mmHg.In addition, user can also independently be selected exercise mode according to the practical situation of oneself, exercise intensity is progressively regulated from low to high, reaches the best effect of preventing and improving cardiac-cerebral ischemia, alleviates the sense of discomfort of the long-time bloodstream blocking of user limbs simultaneously to greatest extent.
As shown in Figure 2, described control circuit 8 is made of microprocessor chip, A/D conversion chip, clock chip, memory chip and power circuit.The signal input part of microprocessor chip links to each other with the signal output part of pressure transducer 6 by the A/D change-over circuit; Its control signal output ends links to each other with the control end of inflator pump 5 with electromagnetic valve 7 respectively; Its data input pin links to each other with button 2 data output ends, and its data output end links to each other with display screen 3 data input pins.The data input pin of microprocessor chip and clock chip time/the calendar signal output part links to each other, acquisition time, calendar information are by being installed in 3 demonstration times of display screen, the date on the housing.The data I/O end of microprocessor chip links to each other with the data I/O end of memory chip by data/address bus, store various kinds of data, for example: the various data of same user different times, and different users's related data separately.
Power circuit is made of AC-DC power module, permutator, replaceable rechargeable battery and electric weight supervisory circuit, mainly is the working power that 5V, 10V, 24V are provided for whole therapeutic instrument.On housing, be provided with external power interface and on and off switch, so that user uses.
In specific embodiment of the utility model, the model that this utility model person has used Motorola Inc. to produce is the differential pressure type pressure transducer (as shown in Figure 6) of MPX5050DP.This differential pressure type pressure transducer carries temperature-compensation circuit, signal amplification circuit and 3 times of overpressure protection circuit, exportable 0.5-4.5V signal.The temperature-compensation circuit that differential pressure type pressure transducer inside has can guarantee its precision under different temperatures; Amplifying circuit can be in advance amplifies the signal of its output, amplifies the error of bringing to avoid outside amplifying circuit; The overpressure protection circuit can guarantee automatically unloading when external pressure surpasses its nominal operation value, is not damaged to guarantee the differential pressure type pressure transducer.
In specific embodiment of the utility model, the A/D conversion chip that this utility model is selected for use is a dual slope integrating analog-digital conversion chip, and it can provide the resolution of 50ppm, and its maximum linear degree error is 1 count value; Zero point error is less than 10 μ V, and null offset can guarantee to detect the precision of data fully less than 0.5 μ V/ ℃, most accurately reflects the gas pressure intensity in the cuff.
In specific embodiment of the utility model, the inflator pump that this utility model is selected for use can provide 300mmHg following pressure, can satisfy different users's demand.The decompression of solenoid control cuff can be protected the differential pressure type pressure transducer in the situation that software protection was lost efficacy, and realizes overpressure protection.
In specific embodiment of the utility model, this utility model is selected near infrared spectrum formula blood oxygen saturation monitoring instrument for use.
Fig. 5 is this utility model control circuit physical circuit figure.Chip D6 (model P89V51RD2) among the figure is a microprocessor chip, and chip D3 (model TLC7135C) is the A/D conversion chip.The signal output part of differential pressure type pressure transducer links to each other with the input end of analog signal IN+ of A/D conversion chip D3 by socket JP1, and A/D conversion chip D3 converts the cuff 4 interior gas pressure intensity values that the differential pressure type pressure transducer detects to INT1 pin that digital data transfer is given microprocessor chip D6.Microprocessor chip D6 carries out its inner control sequence, according to the pressure in the cuff 4 of differential pressure type pressure transducer detection, through pin P10, P11 output control signal, controls the action of inflator pump 5, electromagnetic valve 7 respectively by relay K 1, K2.
Serial ports TXD, the RXD of microprocessor chip D6 selects 1 chip D5 (model C D4052), serial port communication chip D1, D2 (model MAX202E), socket JP2, JP4 to link to each other with button outfan on being installed in housing by two-way 4, receives the instruction of operator's input.The data output end P00-P07 of microprocessor chip D6 links to each other with the data input pin of display screen on being installed in housing by socket JP7, shows various data.
The data I/O end P25-P27 of microprocessor chip D6 with have power-down protection and an I
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2The data I/O end WP of prom memory chip, SDA, SCL link to each other the various data of access.The data port P16 of microprocessor chip D6, P17, T0, T1 link to each other with clock/SDA/SDAE, SCL/SCLE of calendar chip D4 (model SD2000BLP), INT1, INT2 mouth, acquisition time, calendar data, and show by display screen.
Be provided with the low oxygen saturation training of safe, effective with comfortable best limbs control sequence and health propaganda and education softwares such as relevant hypertension, diabetes, hyperlipemia, early stage cardiovascular and cerebrovascular disease, infantile tumour in this utility model memorizer.
This utility model memorizer can carry out data to a plurality of patients to be preserved, and realizes that a plurality of people of machine use.
Because this utility model adopts above design, so the utlity model has following advantage:
1, adopts the monitoring in real time of blood oxygen saturation monitoring instrument to be tried the far-end of limb blood oxygen saturation, and feed back, regulate and control limb ischemia intensity.
2, adopt intelligent LBF control mode, the low oxygen saturation degree and persistent period of the limbs of undergoing training is controlled at particular range, guarantee therapeutic effect, alleviate experimenter's sense of discomfort simultaneously.
3, differential pressure type pressure transducer and the high-precision A/D converter by band temperature-compensating and signal amplifying function detects cuff pressure, and the certainty of measurement height can accurately be controlled cuff pressure and detect blood pressure.
4, can play automatically after the start about health propaganda and education materials such as hypertension, diabetes, hyperlipemia, early stage cardiovascular and cerebrovascular disease and infantile tumours.
5, can improve the ability that human human body, organ or tissue survive and work under anoxia condition, sick treatment all has obvious effect to prevention altitude sickness, cardiovascular and cerebrovascular disease and ischemic heart and brain, thereby reduces sudden death and apoplexy incidence rate.
This utility model is by repeating to oppress the means of user limbs, block the user LBF effectively at interval, thereby excite anti-/ anti-ischemia, the anoxia potential of when injected organism tissue cell, the ability that raising human body, organ or tissue survive and work under anoxia condition.
6, this utility model is easy and simple to handle, and user can independent complete operation, is fit to family, the individual uses separately.In addition, user can independently manually be selected exercise mode according to s own situation, and exercise intensity is progressively regulated from low to high, reaches the best effect of preventing and improving cardiac-cerebral ischemia, and alleviates the sense of discomfort of the long-time bloodstream blocking of user limbs to greatest extent.
Specific embodiment of the present utility model has been done detailed explanation to content of the present utility model.For one of ordinary skill in the art, the any conspicuous change of under the prerequisite that does not deviate from this utility model spirit, it being done, particularly, all constitute to this utility model infringement of patent right, with corresponding legal responsibilities to the replacement that is equal to of some parts.
Claims (8)
1, a kind of low oxygen saturation human body instrument for training, it by housing, be installed in button, display screen, the cuff that links to each other with housing on the housing and be installed in the intravital inflator pump of shell, pressure transducer, electromagnetic valve, control circuit and constitute; It is characterized in that: it also includes a blood oxygen saturation monitoring instrument;
The signal output part of described blood oxygen saturation monitoring instrument links to each other with a control signal input of control circuit;
Described pressure transducer links to each other with cuff, is used to detect the pressure and the pressure oscillation ripple of gas in the cuff, and its detection signal outfan links to each other with the signal input part of control circuit;
The control signal output ends of control circuit links to each other with the control end of inflator pump by lead, and the source of the gas outfan of inflator pump communicates with the source of the gas input of cuff; Another control signal output ends of control circuit links to each other with the control end of electromagnetic valve by lead, and electromagnetic valve is connected in the exhaust channel of cuff.
2, low oxygen saturation human body instrument for training according to claim 1, it is characterized in that: described control circuit carries out closed loop control by inflator pump, electromagnetic valve to the gas in the cuff.
3, low oxygen saturation human body instrument for training according to claim 2 is characterized in that: the data input pin of described control circuit links to each other with the data output end of button on being installed in housing by lead; The data output end of control circuit links to each other with the data input pin of display screen on being installed in housing by lead.
4, according to claim 1 or 2 or 3 described low oxygen saturation human body instrument for training, it is characterized in that: described control circuit is made of microprocessor chip, A/D conversion chip, clock chip, memory chip and power circuit;
The signal input part of microprocessor chip links to each other with the signal output part of pressure transducer by the A/D change-over circuit; Its control signal output ends links to each other with the control end of inflator pump and electromagnetic valve respectively; Its data input pin links to each other with the button data outfan, and its data output end links to each other with the screen data input;
The data input pin of microprocessor chip and clock chip time/the calendar signal output part links to each other; The data I/O end of microprocessor chip links to each other with the data I/O end of memory chip by data/address bus.
5, low oxygen saturation human body instrument for training according to claim 4, it is characterized in that: described pressure transducer is the differential pressure type pressure transducer.
6, low oxygen saturation human body instrument for training according to claim 5, it is characterized in that: described pressure transducer is the differential pressure type pressure transducer that carries temperature-compensation circuit, signal amplification circuit and overpressure protection circuit.
7, low oxygen saturation human body instrument for training according to claim 6 is characterized in that: described inflator pump can provide 300mmHg following pressure.
8, low oxygen saturation human body instrument for training according to claim 4, it is characterized in that: described memory chip is for having power-down protection and I
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2Prom memory.
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