CN108113645A - A kind of non-contact measurement of intraocular pressure device based on static air pressure technology - Google Patents
A kind of non-contact measurement of intraocular pressure device based on static air pressure technology Download PDFInfo
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- CN108113645A CN108113645A CN201611073320.5A CN201611073320A CN108113645A CN 108113645 A CN108113645 A CN 108113645A CN 201611073320 A CN201611073320 A CN 201611073320A CN 108113645 A CN108113645 A CN 108113645A
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- intraocular pressure
- contact measurement
- device based
- static air
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/16—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring intraocular pressure, e.g. tonometers
- A61B3/165—Non-contacting tonometers
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- Ophthalmology & Optometry (AREA)
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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- General Health & Medical Sciences (AREA)
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- Eye Examination Apparatus (AREA)
Abstract
A kind of non-contact measurement of intraocular pressure device based on static air pressure technology, suitable for medical inspection field.New non-contact tonometery measures intraocular pressure using force balance principle, the pressure of cornea is acted on by indirectly measuring to draw intraocular pressure value, different from existing according to the gas pulses duration, make the pulse duration related to air cavity internal pressure by a kind of algorithm, so as to converse the measuring method of intraocular pressure value indirectly, the tonometry device based on static air pressure technology is had devised, air-flotation type tonometry module, the micromatic setting of distance, shell, the feeder for controlling to adjust air-flotation type tonometry module air cavity pressure should be included.The system is non-cpntact measurement, and patient's no pain will not generate cross-infection, while cornea is not needed to have compared with large deformation again, and the non-contact measurement of intraocular pressure device of the method design has many advantages, such as that measurement is more direct, equipment is simple, convenient for popularization.
Description
Technical field
The present invention relates to a kind of non-contact measurement of intraocular pressure devices based on static air pressure technology, are led suitable for medical inspection
Domain.
Background technology
With the development of national economy and modern medicine level, the health of eyes is subject to people more and more to pay close attention to.It is special
It is not this diseases causing blindness for being referred to as " latent killer " of glaucoma.For this purpose, many countries, have carried out to tonometry technology
Research work.Tonometry technology both domestic and external uses contact measuring method at first, but this tonometry method, patient are painful
It needs to anaesthetize, and easily therefore brings the cross-infection between patient, it is inconvenient to use.Then many countries start competitively to study
Non-contact measurement of intraocular pressure technology, particularly beautiful, Kou Deng developed countries have possessed more mature non-contact measurement of intraocular pressure technology, I
State also has many scholars constantly to propose some new technologies, but is not applied in actual tonometry.
At this stage, these mature technologies all by foreign country monopolize and using tonometer equipment made of these technologies it is complicated,
It involves great expense.Existing non-contact measurement of intraocular pressure technology is still not perfect, need to further study precision height, low cost, it is easy to use,
Convenient for the non-contact measurement of intraocular pressure technology of popularization.
The content of the invention
The present invention provides a kind of non-contact measurement of intraocular pressure device based on static air pressure technology, which is non-contact survey
Amount, patient's no pain will not generate cross-infection, while cornea is not needed to have compared with large deformation again, and the method designs non-contact
Tonometry device has many advantages, such as that measurement is more direct, equipment is simple, convenient for popularization.
The technical solution adopted in the present invention is：
A kind of new non-contact tonometery measures intraocular pressure using force balance principle, is acted on by indirectly measurement
Intraocular pressure value is drawn in the pressure of cornea, and different from existing according to the gas pulses duration, pulse is made by a kind of algorithm
Duration is related to air cavity internal pressure, so as to converse the measuring method of intraocular pressure value indirectly, has devised based on static air pressure skill
The tonometry device of art should include air-flotation type tonometry module, the micromatic setting of distance, shell, control and regulation air-flotation type
The feeder of tonometry module air cavity pressure.
The tonometry control system includes two parts:A part is that tiny signal process circuit is mainly:For examining
Whether angle measurement film flattens and detects whether cornea arrives photoemission receiving circuit and its processing of nominal distance with nozzle distance
Circuit, gas pressure sensor export the process circuit of signal;Another part is the Hardware Subdivision using AT89S51 microcontrollers as core
Point, the mainly minimum system of design microcontroller, A/D conversion circuits, D/A conversion and control electric Proportion valves circuit, display driving
The design etc. of circuit, keyboard indicator circuit, power circuit.
The pressure sensor pre-amplification circuit selects LM324, and as voltage buffer driver, LM324 is one and contains
The integrated chip of four operational amplifiers, wherein each amplifier are differential inputs.For its cost than relatively low, there are many single
The advantages of a amplifier amplifier does not have, such as the excessive electric current of low drift, can carry out internal compensation.6 feet of AD620 are output pin, connect mould
The input pin SIG IN3 of MAX 197 in number converting unit, due to the presence of reference voltage, when sensor is sprayed in no gas pressure
When penetrating, the differential voltage of output is 5V.The 6 feet output of AD620 should be OV, if during AD620 output voltage exceptions, can pass through
It adjusts reference voltage and carrys out benchmark AD620.
The big device of filtering and amplifying circuit uses integrated operational amplifier LM324.Amplifying circuit is using the power supply of list 5V power supplys
To inhibit to disturb, connect in amplifier and all added tantalum capacitance and monolithic capacitor at the pin of power supply, in amplifier negative feedback resistor and fortune
Thin-film capacitor is added between the output terminal put.The cutoff frequency of low-pass filter can be set to 40HZ.Second order voltage controlled voltage source low pass
Filter circuit is made of two-stage RC filter circuits and in-phase proportion amplifying circuit, wherein, it is made of LM324 and resistor network
In-phase proportion amplifying circuit is exactly voltage controlled voltage source.
When the A/D conversions start initialization, PO mouth write-in of the control word through microcontroller, A/D conversion chips MAX197 connects
Start gathered data after by control word to be operated, after data acquisition is completed, the INT ends saltus step for being initially high level is low electricity
It is flat.The P1.0 mouths of AT89S51 microcontrollers are detected whether as low level, detect the data port started after low level from MAX 197
Data are read to PO mouthfuls.MAX 197 is a kind of high-precision 12 A/D conversion chips, during output, since HBEN is initial
For low level, what is exported first is least-significant byte data, after PO mouthfuls read least-significant byte data, by HBEN set, AT89S51 monolithics
Machine reads data from the data port of MAX 197 again, and low 4 of PO mouthfuls of data are the four high of final data at this time.So
12-bit data are all read out to needs by that could complete twice.The data of reading can be shown by calculating processing
Show while be sent to further in computer handled.
The beneficial effects of the invention are as follows：The system is non-cpntact measurement, and patient's no pain will not generate cross-infection, together
When cornea is not needed to have compared with large deformation again, the non-contact measurement of intraocular pressure device of the method design, which has, measures more direct, equipment
Simply, convenient for popularization the advantages that.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the Hardware Design block diagram of the present invention.
Fig. 2 is the pressure sensor pre-amplification circuit of the present invention.
Fig. 3 is the filtering and amplifying circuit of the present invention.
Fig. 4 is the A/D switching software flow charts of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Such as Fig. 1, tonometry control system includes two parts:A part is that tiny signal process circuit is mainly:For
Whether detection cornea flattens and detects whether cornea arrives photoemission receiving circuit and its place of nominal distance with nozzle distance
Circuit is managed, gas pressure sensor exports the process circuit of signal;Another part is the hardware using AT89S51 microcontrollers as core
Part, the mainly minimum system of design microcontroller, A/D conversion circuits, D/A conversion and control electric Proportion valves circuit, display are driven
Move design of circuit, keyboard indicator circuit, power circuit etc..
Such as Fig. 2, pressure sensor pre-amplification circuit selects LM324, and as voltage buffer driver, LM324 is one
Containing there are four the integrated chip of operational amplifier, wherein each amplifier is differential input.Its cost has perhaps than relatively low
The advantages of mostly single amplifier amplifier does not have, such as the excessive electric current of low drift, can carry out internal compensation.6 feet of AD620 are output pin,
The input pin SIG IN3 of MAX 197 in AD conversion unit are met, due to the presence of reference voltage, when sensor is in no gas pressure
When power is sprayed, the differential voltage of output is 5V.The 6 feet output of AD620 should be OV, if during AD620 output voltage exceptions, it can
By adjusting reference voltage come benchmark AD620.
Such as Fig. 3, the big device of filtering and amplifying circuit uses integrated operational amplifier LM324.Amplifying circuit is supplied using list 5V power supplys
Electricity is connect in amplifier and has all added tantalum capacitance and monolithic capacitor at the pin of power supply to inhibit interference, in amplifier negative feedback resistor and
Thin-film capacitor is added between the output terminal of amplifier.The cutoff frequency of low-pass filter can be set to 40HZ.Second order voltage controlled voltage source is low
Bandpass filter circuit is made of two-stage RC filter circuits and in-phase proportion amplifying circuit, wherein, it is made of LM324 and resistor network
In-phase proportion amplifying circuit be exactly voltage controlled voltage source.
Such as Fig. 4, when A/D conversions start initialization, PO mouth of the control word through microcontroller writes, A/D conversion chips MAX197
Receive to start after control word the operation of gathered data, after data acquisition is completed, the INT ends saltus step for being initially high level is low
Level.The P1.0 mouths of AT89S51 microcontrollers are detected whether as low level, detect the data started after low level from MAX 197
Mouth reads data to PO mouthfuls.MAX 197 is a kind of high-precision 12 A/D conversion chips, during output, due at the beginning of HBEN
Begin as low level, what is exported first is least-significant byte data, and after PO mouthfuls read least-significant byte data, by HBEN set, AT89S51 is mono-
Piece machine reads data from the data port of MAX 197 again, and low 4 of PO mouthfuls of data are the four high of final data at this time.Institute
It is needed so that 12-bit data are all read out by that could complete twice.The data of reading can be carried out by calculating processing
Display is sent to further in computer handled simultaneously.
Claims (9)
1. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology, it is characterized in that：The non-contact measurement of intraocular pressure
Device acts on the pressure of cornea by indirectly measuring to draw intraocular pressure value, different from it is existing according to gas pulses continue when
Between, make the pulse duration related to air cavity internal pressure by a kind of algorithm, so as to converse intraocular pressure value indirectly.
2. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
Stating tonometry control system includes tiny signal process circuit, the hardware circuit using AT89S51 microcontrollers as core.
3. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
Chemical sensor can detect that carbon monoxide, methane, propane, vulcanization using TGS gas sensors in the control system stated
The concentration of the gases such as the toxic gases such as hydrogen and alcohol, motion sensor release infrared sensor using LHi878 heat, can examine
Measure human infrared signal source.
4. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
The minimum system, A/D conversion circuits, D/A that the hardware components using AT89S51 microcontrollers as core stated mainly include microcontroller turn
Change control electric Proportion valve circuit, display driver circuit, keyboard indicator circuit, power circuit.
5. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
State pressure sensor pre-amplification circuit select LM324 as voltage buffer driver, LM324 be one contain there are four computing put
The integrated chip of big device, wherein each amplifier is differential input.
6. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
It states in pressure sensor pre-amplification circuit, 6 feet of AD620 are output pin, connect the input pin of MAX 197 in AD conversion unit
SIG IN3, due to the presence of reference voltage, when sensor is when no gas pressure sprays, the differential voltage of output is 5V.
7. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
The 6 feet output for stating AD620 should be OV, if during AD620 output voltage exceptions, it can be by adjusting reference voltage come benchmark AD620.
8. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
The big device of filtering and amplifying circuit is stated using integrated operational amplifier LM324, amplifying circuit uses the power supply of list 5V power supplys to inhibit to disturb,
It is connect in amplifier and has all added tantalum capacitance and monolithic capacitor at the pin of power supply.
9. a kind of non-contact measurement of intraocular pressure device based on static air pressure technology according to claim 1, it is characterized in that：Institute
When stating A/D conversions and starting initialization, PO mouth of the control word through microcontroller writes, after A/D conversion chips MAX197 receives control word
Start the operation of gathered data, after data acquisition is completed, the INT ends saltus step for being initially high level is low level.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073320.5A CN108113645A (en) | 2016-11-29 | 2016-11-29 | A kind of non-contact measurement of intraocular pressure device based on static air pressure technology |
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| CN201611073320.5A CN108113645A (en) | 2016-11-29 | 2016-11-29 | A kind of non-contact measurement of intraocular pressure device based on static air pressure technology |
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| CN108113645A true CN108113645A (en) | 2018-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112292070A (en) * | 2018-06-18 | 2021-01-29 | 布里尔发动机有限责任公司 | Hand-held tactile meter |
-
2016
- 2016-11-29 CN CN201611073320.5A patent/CN108113645A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112292070A (en) * | 2018-06-18 | 2021-01-29 | 布里尔发动机有限责任公司 | Hand-held tactile meter |
| CN112292070B (en) * | 2018-06-18 | 2024-04-02 | 布里尔发动机有限责任公司 | Hand-held tactile meter |
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Application publication date: 20180605 |
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| WD01 | Invention patent application deemed withdrawn after publication |