CN108670254A - A kind of cup type electrodes of the EIT surveying contact impedance - Google Patents
A kind of cup type electrodes of the EIT surveying contact impedance Download PDFInfo
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- CN108670254A CN108670254A CN201810528046.9A CN201810528046A CN108670254A CN 108670254 A CN108670254 A CN 108670254A CN 201810528046 A CN201810528046 A CN 201810528046A CN 108670254 A CN108670254 A CN 108670254A
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- electrode
- cup
- cup body
- contact impedance
- air pressure
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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
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0536—Impedance imaging, e.g. by tomography
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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- Engineering & Computer Science (AREA)
- Radiology & Medical Imaging (AREA)
- Heart & Thoracic Surgery (AREA)
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- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The present invention relates to a kind of cup type electrodes of the EIT surveying contact impedance, include cup body, electrode to, electrode interface and baroceptor including electrode, the cup body includes shell, inner insulating layer, ground plane and external insulation layer successively from inside to outside, each electrode of electrode pair is fixed between the shell of cup body and inner insulating layer, it is stretched from cup edge to bottom of a cup, the cup body is rigid material, and aspirating hole is provided in bottom of a cup or close to the position of bottom of a cup；The baroceptor is for air pressure in detection cup body, and the aspirating hole is connected with micro air pump, by forming negative pressure state in cup body to the control of micro air pump so that the rim of a cup of electrode is adsorbed on measured object body surface.The present invention has the advantages that adjustable contact impedance and stablizes not easily to fall off.
Description
Technical field
The present invention relates to a kind of human impedance image-forming data acquisition systems.
Background technology
Review of Electrical Impedance Tomography is a kind of medical image detection technique, can be used for the tissues knot such as torso model, abdominal cavity
The inspection of structure, it usually needs the electrode of 16 and the above equidistantly distributed.By applying current excitation letter to each electrode successively
Number or voltage excitation signals, and acquire the signal detected on other electrodes simultaneously, using algorithm for reconstructing, obtain measuring section
Electrical characteristics are distributed.
Tissue has good electric conductivity, and at different frequencies, variation range is from tens ohm to several for impedance
Hundred ohm；But the contact impedance between electrode and skin can have more significantly with the elastic of the difference and electrode of human body installation
Variation, variation range is from hundreds of ohm to tens of thousands of ohms, and the contact impedance of different location is also different, this is to electrical impedance imaging
There is obvious influence.Therefore, measure and adjust the contact that the contact impedance between electrode and skin is conducive to real-time detecting electrode
Situation improves the quality and stability of electrical impedance imaging.
At present in biomedical sector, electrode is usually laminated structure, and skin surface is pasted on by way of stickup simultaneously
Ensure that electrode and skin contact are good.However, this way of contact pressure is smaller, it is easy to fall off, and contact impedance is unstable.Thus
Invent it is a kind of can measure and adjust contact impedance and stablize the electrode system for human impedance imaging not easily to fall off,
There is important application value in actually detected.
Invention content
It can be used for measuring and adjusting contact impedance and stablize not easily to fall off be used for the object of the present invention is to provide a kind of
The electrode of human impedance imaging, technical solution are as follows.
A kind of cup type electrodes of the EIT surveying contact impedance, including electrode includes cup body, electrode to, electrode interface and air pressure
Sensor, the cup body include shell, inner insulating layer, ground plane and external insulation layer, each of electrode pair successively from inside to outside
Electrode is fixed between the shell of cup body and inner insulating layer, is stretched from cup edge to bottom of a cup, and the cup body is rigid material,
Bottom of a cup is provided with aspirating hole close to the position of bottom of a cup；The baroceptor is for air pressure in detection cup body, the pumping
Stomata is connected with micro air pump, by forming negative pressure state in cup body to the control of micro air pump so that the rim of a cup of electrode is inhaled
It is attached to measured object body surface.
The invention adopts the above technical scheme, which has the following advantages：
1) fix electrode by the way of closing tiny structure cavity, improve the stability of electrode position, ensure electrode with
The reliability of skin contact；
2) electrode group constituted using multiple cup type electrodes by the present invention, each electrode and electrode signal controller phase
Even, electrode signal controller can adjust the air pressure in electrode cavity according to the testing result of baroceptor, so that by
Each electrode of electrode group and the pressure of skin that multiple electrodes are constituted are consistent and are in safe tiny structure range, ensure each electricity
The contact impedance of pole and skin is consistent, and can optimize the quality of data and image quality；
3) electrical impedance can be used to monitor the contact condition of electrode and skin respectively with baroceptor, has accurately to fall
Warning function is fallen, the stability of system is improved using closed loop detection.
Description of the drawings
Fig. 1 is the electrode group structure schematic diagram for using the electrode of the present invention.
Fig. 2 is the circuit structure diagram for the electrode system for using the electrode of the present invention.
Fig. 3 is scheme of installation of the electrode in torso model.
Fig. 4 is the structural schematic diagram of electrode.
Fig. 5 is electrode vertical view.
Fig. 6 is electrode front view.
Electrical connection diagrams of the Fig. 7 between electrode pair and electrode signal controller.
Specific implementation mode
The present invention is described in detail with application scenarios below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, the human impedance image-forming data acquisition of the controllable contact impedance of electrode using the present invention
System critical piece includes：
The electrode group of several electrodes composition, each electrode are respectively arranged with：
Electrode interface is used for connection electrode and data line；
Micro air pump, for being discharged or being pumped into gas according to instruction when system works；
Baroceptor, for the air pressure in real-time detecting electrode；
The electrode pair being made of two symmetrical electrodes, for the measurement of contact impedance, excitation and detection electric signal；
Data line includes a plurality of conducting wire, equidistantly respectively draw for connection electrode conducting wire, connect each electrode and
Electrode signal controller, is used for transmission signal；
Connector is used for connection electrode signal controller；
Electrode signal controller, is a part for entire electric impedance imaging system, and electrode signal controller is internally provided with：
Air pressure control module, for equalizing the air pressure in coordination electrode；
Electrode data processing module, the excitation for coordination electrode and measuring state, and contact of the measuring electrode with skin
Impedance；
Alarm module connects for sending out alarm when detecting that electrode is bad with skin contact, and to medical worker's feedback
Touch undesirable electrode number；
Movable nylon tape is set on data line close near the electrode of connector, for fixing extra not connected electricity
The data line of pole.
Operation principle is explained in detail with reference to Fig. 2.
Each electrode is respectively connected to electrode signal controller by data line.
When mounted, when the electrode of n-th of electrode is to detecting that electrode has been fitted in skin surface, air pump pumps out electrode cavity
Interior gas forms negative pressure state under the action of air pressure reduces in electrode, be gradually adsorbed to skin surface, reduces contact impedance
And keep electrode secured with skin attachement；When the air pressure that baroceptor detects reaches the atmospheric pressure value of installation electrode of setting,
Installation is complete for the electrode, micro air pump break-off, and on the skin, electrode signal controller passes through knowledge for electrode absorption completely at this time
The number of electrodes not connected determines working electrode quantity.After all electrode adsorptions install, system starts.
Before system work, the safe range and dynamic equilibrium value of default nominal pressure value are needed, it is more than people to prevent air pressure
Body skin can tolerance range, cause skin histology impaired.During the work time, air pressure control module is responsible for balanced each electrode cavity
The air pressure of body.Baroceptor monitors the gas pressure in electrode in real time, and barometric information is fed back to electricity by data line
The air pressure control module of pole signal controller, there are four types of the state of a controls of air pressure：If air pressure is more than dynamic equilibrium value, miniature gas
Pumped gas；If air pressure is less than dynamic equilibrium value, micro air pump is pumped into gas；If air pressure is at dynamic equilibrium value, electricity
The air pressure of pole is in equilibrium state；If air pressure is more than nominal pressure range and electrode is more than setting threshold to the contact impedance value measured
Value, micro air pump gas bleeding, and alarm signal is returned, alarm module feeds back the electrode of corresponding poor contact to medical worker
Number.Using air pressure detection function, electrode system can realize that stability is adjusted.
During the work time, the impedance measurement of electrode and excitation measurement process alternately, by electrode data processing module
The state for controlling each electrode pair, according to the excitation measurement pattern of program setting to each electrode to encouraging in order, measuring telecommunications
Number, carry out impedance measurement after each excitation measurement period.
As shown in figure 3, when connector be inserted into electrode signal controller and be powered after, according to data line setting distance by
One places an electrode on skin, then electrode automatic absorbing is fixed remaining data with activity nylon tape and passed in skin surface
Defeated line controls its start-up operation by the switch of system.
Electrode describes：
Referring to fig. 4 to fig. 6, electrode is mainly by aspirating hole 1, signal processing module 2, insulating layer 3, ground plane 4, a pair of electrodes
Thin slice 5 and shell 6 are constituted.Shell 6 is using hard material (such as acrylic, plastics etc.), correspondingly, layer structure can both make
With hard material, soft material can also be used.
In Fig. 4,1 is aspirating hole, is set to the tip platform of electrode cup body.When electrode is installed, then by control system
Control air pump carries out decompression adsorption operations.2 be signal processing module, is positioned over the tip platform of electrode, including electrode interface, gas
Pressure sensor and analog-to-digital conversion circuit.
As shown in Figure 5 and Figure 6, cup body is made up of multiple layers, and external insulation layer 32 is followed successively by from outside to inside in electrode position, ground connection
Layer 4, inner insulating layer 31, electrode foil 5, shell 6.Wherein, inner insulating layer 31 coats shell and electrode foil, for ground connection to be isolated
Layer and measuring electrode sheet prevent ground plane and measuring electrode sheet short circuit；The cladding of external insulation layer 32 is in addition to electric at micro air pump, rim of a cup
Entire cup body outside pole and electrode interface, prevents electrode to be connected with external circuitry, is had an impact to cup body circuit.Ground plane 4 wraps
Overlay on outside inner insulating layer, prevent the electromagnetic interference of outer bound pair electrode slice, at the same prevent in the electrode slice course of work to surrounding other
The electromagnetic interference of electrode.5 be a pair of electrodes thin slice, the symmetric position and wrapping portion rim of a cup of rim of a cup is attached to, referring to Fig. 4, electrode
Thin slice 5 extends to cup body tip platform edge, is then connect with signal processing module by conducting wire.
As shown in fig. 7, the port of connection electrode signal controller in need all summarize at electrode interface, and pass through company
Wiring is connect with electrode signal controller；Electrode signal controller provides power supply by electrode interface to entire electrode, wherein wrapping
It includes and powers to baroceptor, ground plane connects power cathode；When electrode is as excitation electrode, system is by electrode interface to electricity
Extremely to sending pumping signal.Baroceptor will detect that air pressure signal is passed by electrode interface for monitoring air pressure in cup body
It is back to electrode signal controller.If the atmospheric pressure value that baroceptor detects is less than safe range, electrode signal controller is sent out
The too low alarm signal of air pressure；It is set if the atmospheric pressure value that baroceptor detects is more than more than the voltage threshold and contact impedance of setting
Fixed impedance threshold, electrode signal controller, which is sent out, falls alarm signal.Simulation numeral (AD) conversion circuit is used for electrode pair
The impedance value and voltage value measured transmits after being converted to digital signal, or is not provided with A/D converter circuit, the voltage that will directly measure
It is transmitted with analog signal form with resistance value.
Claims (1)
1. a kind of cup type electrodes of the EIT surveying contact impedance, including electrode includes cup body, electrode to, electrode interface and air pressure transmission
Sensor, the cup body include shell, inner insulating layer, ground plane and external insulation layer successively from inside to outside.Each electricity of electrode pair
Pole is fixed between the shell of cup body and inner insulating layer, is stretched from cup edge to bottom of a cup, and the cup body is rigid material, in cup
Bottom is provided with aspirating hole close to the position of bottom of a cup；The baroceptor is for air pressure in detection cup body, the pumping
Hole is connected with micro air pump, by forming negative pressure state in cup body to the control of micro air pump so that the rim of a cup of electrode adsorbs
In measured object body surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810528046.9A CN108670254A (en) | 2018-05-29 | 2018-05-29 | A kind of cup type electrodes of the EIT surveying contact impedance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810528046.9A CN108670254A (en) | 2018-05-29 | 2018-05-29 | A kind of cup type electrodes of the EIT surveying contact impedance |
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| Publication Number | Publication Date |
|---|---|
| CN108670254A true CN108670254A (en) | 2018-10-19 |
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| CN201810528046.9A Pending CN108670254A (en) | 2018-05-29 | 2018-05-29 | A kind of cup type electrodes of the EIT surveying contact impedance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110051327A (en) * | 2019-04-09 | 2019-07-26 | 南方医科大学 | Suction type breast tissue dielectric parameter detection device and its control method |
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| US20110082358A1 (en) * | 2005-04-21 | 2011-04-07 | Epi-Sci, Llc | Method and system for detecting electrophysiological changes in pre-cancerous and cancerous tissue and epithelium |
| CN201987552U (en) * | 2011-03-03 | 2011-09-28 | 王惠新 | Adsorption electrode for electrocardiogram machine |
| CN203089113U (en) * | 2013-02-23 | 2013-07-31 | 郭风华 | Electrocardiogram electrode suction cup |
| CN203898303U (en) * | 2014-06-20 | 2014-10-29 | 杜建英 | Electrocardiogram chest lead ball suction electrode with falling alarm function |
| CN204147025U (en) * | 2014-05-01 | 2015-02-11 | 范丽 | ECG electrode suction cup |
-
2018
- 2018-05-29 CN CN201810528046.9A patent/CN108670254A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110082358A1 (en) * | 2005-04-21 | 2011-04-07 | Epi-Sci, Llc | Method and system for detecting electrophysiological changes in pre-cancerous and cancerous tissue and epithelium |
| CN201987552U (en) * | 2011-03-03 | 2011-09-28 | 王惠新 | Adsorption electrode for electrocardiogram machine |
| CN203089113U (en) * | 2013-02-23 | 2013-07-31 | 郭风华 | Electrocardiogram electrode suction cup |
| CN204147025U (en) * | 2014-05-01 | 2015-02-11 | 范丽 | ECG electrode suction cup |
| CN203898303U (en) * | 2014-06-20 | 2014-10-29 | 杜建英 | Electrocardiogram chest lead ball suction electrode with falling alarm function |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110051327A (en) * | 2019-04-09 | 2019-07-26 | 南方医科大学 | Suction type breast tissue dielectric parameter detection device and its control method |
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Application publication date: 20181019 |