CN103349549A - Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment - Google Patents
Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment Download PDFInfo
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- CN103349549A CN103349549A CN2013103113115A CN201310311311A CN103349549A CN 103349549 A CN103349549 A CN 103349549A CN 2013103113115 A CN2013103113115 A CN 2013103113115A CN 201310311311 A CN201310311311 A CN 201310311311A CN 103349549 A CN103349549 A CN 103349549A
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Abstract
The invention discloses a threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment. The threefold isolation anti-jamming circuit used for the electromyogram evoked potential equipment comprises a power input unit arranged at a power input end and two isolation units which are connected in series and connected between a main circuit and an acquisition circuit, wherein the power input unit comprises an isolation transformer and a medical standard isolation switching power supply, the isolation transformer and the medical standard isolation switching power supply are connected, and each isolation unit comprises a power isolation circuit and a signal isolation circuit. Each power isolation circuit comprises an oscillator and a commutating and voltage-stabilizing module, wherein one end of the oscillator is connected with the main circuit, and the isolation transformer is arranged between the commutating and voltage-stabilizing module and the oscillator. The two power isolation circuits are connected in sequence, and the two signal isolation circuits are connected in sequence. Due to the adoption of the threefold isolation anti-jamming technique, the threefold isolation anti-jamming circuit used for the electromyogram evoked potential equipment has the advantages that compared with traditional electromyogram equipment, multi-level isolation is achieved. In addition, a functional earthing is added, and therefore an interference signal can not reach the application part, interference caused by surroundings is effectively suppressed, and requirements for the surroundings are greatly reduced.
Description
Technical field
The present invention relates to the Anti-Jamming Technique of electromyogram evoked potentuial measuring system, particularly a kind of triple isolation anti-jamming circuits for the electromyogram evoked potentuial measuring system.
Background technology
The Electrophysiology diagnostic techniques is a kind of extension of neurologic check, mainly comprise electromyography and bring out current potential two large divisions, be one and originate from American-European subject, be widely used in clinically the section office such as neural inside and outside section, orthopaedics, Pediatrics Department, department of endocrinology, department of eye, ophthalmology, urology department, forensic identification.
Electromyogram (EMG) is used for the infringement of Differential Diagnosis neurogenic, muscle-derived infringement and neuromuscular junction pathological changes etc., the cause of disease of difference disease and the location of carrying out diseased region, in addition, electromyogram also is used for following the trail of at the therapeutic process of various diseases recovery process and the curative effect of disease.
Bring out current potential (Evoked Potential, EP) refer to give nervous system (from the sensor to the cerebral cortex) specific stimulation, or brain is processed to the information that stimulates (positivity or negativity), can detecting of producing of the corresponding site of this system and brain, have the bio electricity of relative Fixed Time Interval (concerning during lock) and certain bits phase to react with stimulation, be the unique objective means that reflect so far psychology-mental status.Check result helps to judge integrity and the functional status of nervous pathway structure.
The electromyogram evoked potentuial measuring system is exactly to integrate electromyogram and bring out a kind of Clinical detection instrument that current potential checks, record nerve conduction and the muscle bio electricity when lax and contraction detects peripheral nerve and muscle disease; Record is movable with the neuropotential of stimulus related, judges integrity and the functional status of nervous pathway structure.
Because the signal of the required collection of electromyogram evoked potentuial measuring system all is atomic weak signal, usually also less thousands of times than EEG signal, so require very highly for the signals collecting sensitivity of instrument, input impedance, common mode rejection ratio, capacity of resisting disturbance etc., carry out correct diagnosis otherwise be difficult to collect real signal.Electromyogram in the market, except the interference free performance of instrument self, external environment condition there is higher requirement, the general ground wire that special use all need be installed on socket, the equipment that other high frequency radiations can not be arranged on every side, X-ray machine for example, mobile phone, the external environment conditions such as elevator all can be brought radiation interference, this brings larger difficulty for installing and using of hospital, some import instrument since when design do not consider the specific medical environment facility of China, it is very large to cause its instrument in use to disturb, also to build specially the metallic shield room, significantly increase the cost of hospital department.
For the tight requirement of the high standard of external environment condition, so that the clinical practice of electromyogram evoked potentuial measuring system popularization is very difficult, the doctor can only use instrument that patient is diagnosed in fixing room, the private environment that breaks away from the room will weaken the signals collecting ability greatly, and the portable electromyogram evoked potentuial measuring system on the market often faces and checks the awkward situation such as environmental disturbances causes greatly correctly diagnosing.
Summary of the invention
The object of the present invention is to provide a kind of filtering interference signals, make the electromyogram evoked potentuial measuring system can greatly reduce in use triple isolation anti-jamming circuits that are used for the electromyogram evoked potentuial measuring system to the dependence of external environment condition.
For solving the problems of the technologies described above, the present invention is used for triple isolation anti-jamming circuits of electromyogram evoked potentuial measuring system, comprise the power input unit that is arranged on power input and be arranged on main circuit and Acquisition Circuit between the isolated location of two serial connections; Described power input unit comprises interconnective isolating transformer and medical standard isolating switch power; Described isolated location comprises power isolation circuit and signal isolation circuit; Wherein said power isolation circuit comprises: agitator, and described agitator one end is connected with described main circuit; The rectifying and voltage-stabilizing module is provided with isolating transformer between described rectifying and voltage-stabilizing module and described agitator; Two described power isolation circuits connect successively, and two described signal isolation circuit connect successively.
Also be circumscribed with one functionally in described first order isolated location rear end.
Described isolating transformer is the 1:1 isolating transformer.Described signal isolation circuit adopts HCNW136 chip and HNCR201 chip.
Triple isolation anti-jamming circuits that the present invention is used for the electromyogram evoked potentuial measuring system have used triple isolation Anti-Jamming Techniques, increased multi-stage isolation than traditional electromyogram instrument, on this basis, also increased a function ground connection, so that interfering signal can't reach applying portion, establishment the interference that brings of surrounding, greatly reduce the requirement to surrounding, for doctor's use and the popularization of instrument very great meaning is arranged.
Description of drawings
Fig. 1 is triple isolation anti-jamming circuit sketch maps that the present invention is used for the electromyogram evoked potentuial measuring system.
The specific embodiment
Below in conjunction with accompanying drawing triple isolation anti-jamming circuits that the present invention is used for the electromyogram evoked potentuial measuring system are described in further detail.
As shown in Figure 1, the present invention is used for triple isolation anti-jamming circuits of electromyogram evoked potentuial measuring system, comprise the power input unit that is arranged on power input and be arranged on main circuit and Acquisition Circuit between the isolated location of two serial connections; Power input unit comprises interconnective 1:1 isolating transformer and medical standard isolating switch power, and power input unit is isolated as the first order.
Second level isolation, third level isolation are comprised of the isolated location of two-stage series connection, and it comprises power isolation circuit and signal isolation circuit.Power isolation circuit is comprised of agitator, isolating transformer and rectifying and voltage-stabilizing module, and the rectifying and voltage-stabilizing module of second level isolation is connected with the agitator of third level isolation; The signal isolation circuit of two-stage connects successively, and what signal isolation circuit adopted is HCNW136 chip and HNCR201 chip.
Used first order isolation at power input: isolating transformer+medical standard isolating switch power, it is the isolation of the second level isolation series connection third level between the main circuit of instrument and Acquisition Circuit, in the middle of this two-stage isolation, increase by one functionally, increase by one to the path of the earth to interfering signal, establishment interfering signal.
Interfering signal under this kind structure has increased following two alternating current paths, and interfering signal is coupled to isolation rear end, the second level, and major part is absorbed functionally, has avoided being coupled to the applying portion of third level isolation rear end to affect normal signal.
Isolating transformer → first order isolating switch power → main frame → isolating device rear end, the second level → functionally.
Isolating transformer → first order isolating switch power → main frame → second level isolating device → third level isolating device front end → functionally.
When reality is used, can be connected to port functionally on any metal parts, coupling capacitance between this metal parts and the earth is the bigger the better, such as being connected to the common metal bed of hospital, metal window-frame, metal cupboard etc., coupling capacitance is larger, equiva lent impedance 1/JWC is just less, the effect that suppresses interfering signal is also just better, because this functionally two ends connection all is isolating device, its electric clearance and creep age distance all reach the standard of withstand voltage 4KV, meet medical standard fully, doctor and patient are not had potential safety hazard.
Triple isolation anti-jamming circuits that the present invention is used for the electromyogram evoked potentuial measuring system have used triple isolation Anti-Jamming Techniques, increased multi-stage isolation than traditional electromyogram instrument, on this basis, also increased a function ground connection, so that interfering signal can't reach applying portion, establishment the interference that brings of surrounding, greatly reduce the requirement to surrounding, for doctor's use and the popularization of instrument very great meaning is arranged.
Below the preferred embodiment of the invention is specified, but the present invention is not limited to embodiment, those of ordinary skill in the art also can make all modification that is equal to or replacement under the prerequisite of the invention spirit, the modification that these are equal to or replacement all are included in the application's the scope.
Claims (4)
1. be used for triple isolation anti-jamming circuits of electromyogram evoked potentuial measuring system, it is characterized in that, comprise the power input unit that is arranged on power input and be arranged on main circuit and Acquisition Circuit between the isolated location of two serial connections;
Described power input unit comprises interconnective isolating transformer and medical standard isolating switch power;
Described isolated location comprises power isolation circuit and signal isolation circuit; Wherein
Described power isolation circuit comprises:
Agitator, described agitator one end is connected with described main circuit;
The rectifying and voltage-stabilizing module is provided with isolating transformer between described rectifying and voltage-stabilizing module and described agitator;
Two described power isolation circuits connect successively, and two described signal isolation circuit connect successively.
2. the triple isolation anti-jamming circuits for the electromyogram evoked potentuial measuring system according to claim 1 is characterized in that, also are circumscribed with one functionally in described first order isolated location rear end.
3. the triple isolation anti-jamming circuits for the electromyogram evoked potentuial measuring system according to claim 1 is characterized in that described isolating transformer is the 1:1 isolating transformer.
4. the triple isolation anti-jamming circuits for the electromyogram evoked potentuial measuring system according to claim 1 is characterized in that, described signal isolation circuit adopts HCNW136 chip and HNCR201 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103113115A CN103349549A (en) | 2013-07-23 | 2013-07-23 | Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103113115A CN103349549A (en) | 2013-07-23 | 2013-07-23 | Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment |
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| CN103349549A true CN103349549A (en) | 2013-10-16 |
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| CN2013103113115A Pending CN103349549A (en) | 2013-07-23 | 2013-07-23 | Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253664A (en) * | 2014-09-18 | 2014-12-31 | 易程（苏州）智能系统有限公司 | Train broadcasting control box based on Ethernet network |
| CN107233094A (en) * | 2016-03-29 | 2017-10-10 | 上海海神医疗电子仪器有限公司 | A kind of electromyogram evoked potentuial measuring system |
| CN104253664B (en) * | 2014-09-18 | 2018-08-31 | 苏州华启智能科技有限公司 | A kind of broadcasting for train control box based on ethernet network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946324A (en) * | 1973-07-16 | 1976-03-23 | Analog Devices, Incorporated | Isolation amplifier |
| US4737712A (en) * | 1986-12-31 | 1988-04-12 | General Electric Company | Isolated power transfer and patient monitoring system with interference rejection useful with NMR apparatus |
| US5309918A (en) * | 1991-03-28 | 1994-05-10 | Hewlett-Packard Company | Transducer for converting floating ground potential signals to non-floating signals and method of use |
| GB2349283A (en) * | 1999-04-17 | 2000-10-25 | Data Acquisition Systems Ltd | Isolated power supply for a peripheral device coupled to a computer |
| CN101662214A (en) * | 2009-09-22 | 2010-03-03 | 浙江大学 | High voltage isolating switch power and a plurality of output isolated switch power systems |
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2013
- 2013-07-23 CN CN2013103113115A patent/CN103349549A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946324A (en) * | 1973-07-16 | 1976-03-23 | Analog Devices, Incorporated | Isolation amplifier |
| US4737712A (en) * | 1986-12-31 | 1988-04-12 | General Electric Company | Isolated power transfer and patient monitoring system with interference rejection useful with NMR apparatus |
| US5309918A (en) * | 1991-03-28 | 1994-05-10 | Hewlett-Packard Company | Transducer for converting floating ground potential signals to non-floating signals and method of use |
| GB2349283A (en) * | 1999-04-17 | 2000-10-25 | Data Acquisition Systems Ltd | Isolated power supply for a peripheral device coupled to a computer |
| CN101662214A (en) * | 2009-09-22 | 2010-03-03 | 浙江大学 | High voltage isolating switch power and a plurality of output isolated switch power systems |
Non-Patent Citations (1)
| Title |
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| 韩裔焕: "《现代医院医疗器械维护检修实用大典》", 28 February 2006 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253664A (en) * | 2014-09-18 | 2014-12-31 | 易程（苏州）智能系统有限公司 | Train broadcasting control box based on Ethernet network |
| CN104253664B (en) * | 2014-09-18 | 2018-08-31 | 苏州华启智能科技有限公司 | A kind of broadcasting for train control box based on ethernet network |
| CN107233094A (en) * | 2016-03-29 | 2017-10-10 | 上海海神医疗电子仪器有限公司 | A kind of electromyogram evoked potentuial measuring system |
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Application publication date: 20131016 |