CN110456291A - Filter circuit and electronic device - Google Patents
Filter circuit and electronic device Download PDFInfo
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- CN110456291A CN110456291A CN201910803568.XA CN201910803568A CN110456291A CN 110456291 A CN110456291 A CN 110456291A CN 201910803568 A CN201910803568 A CN 201910803568A CN 110456291 A CN110456291 A CN 110456291A
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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
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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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
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
- A61N1/395—Heart defibrillators for treating atrial fibrillation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
- A61N1/3956—Implantable devices for applying electric shocks to the heart, e.g. for cardioversion
- A61N1/3962—Implantable devices for applying electric shocks to the heart, e.g. for cardioversion in combination with another heart therapy
- A61N1/39622—Pacing therapy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3607—RF waveform generators, e.g. frequency generators, amplitude-, frequency- or phase modulators or shifters, pulse programmers, digital to analog converters for the RF signal, means for filtering or attenuating of the RF signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
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Abstract
The present invention provides a kind of filter circuit and electronic device, with sequentially connected poor common mode filtering module, differential mode filter module and common mode filtering module, good inhibitory effect can be provided to the Electromagnetic Interference signal etc. in radiofrequency signal or the EMC test generated during MRI, and circuit structure is simple, occupies little space；But also input impedance can be balanced, common mode, differential mode rejection are promoted, the sensing or output effect of actual signal are improved；Furthermore, the signal of filter circuit output is entirely common-mode signal, potential difference caused by Electromagnetic Interference signal will not be generated between anode output end and cathode end, also thus the load that late-class circuit is just flowed through without electric current caused by Electromagnetic Interference signal is conducive to the late-class circuit for the output end connection for improving filter circuit further to the inhibition attenuating of Electromagnetic Interference signal.
Description
Technical field
The present invention relates to the field of medical instrument technology more particularly to a kind of filter circuits and electronic device.
Background technique
Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is one kind of medical tomographic imaging.Compared to
Computed tomography (Computed Tomography, CT), MRI have no ionising radiation to damage, high soft-tissue imaging
The unrivaled performance of the CT such as precision, this makes MRI have important application value in medical diagnostic field of today.However,
Powerful electromagnetic field can be generated when MRI scan, for safety, be generally implanted pacemaker (Implanted in vivo
Pulse Generator, IPG), implanted defibrillator (Implanted Cadiac Defibrillator, ICD) and other classes
The patient of the active Implantable Medical Device of type does not allow for carrying out MRI scan.
By taking pacemaker as an example, have many pacemaker products at present, is tied by optimizing pacemaker itself
The design of structure and the design of pacing electrode wire, influence and MRI radio frequency with reduction to pacemaker are led in pacing electrode
The temperature rise generated on line, so that patient in the case where certain condition with pacemaker is able to carry out MRI scan,
The MRI for realizing pacemaker is compatible.But these pacemaker products are before MRI scan, it is necessary to which setting to MRI is pacified
Syntype, to close the sensing module of pacemaker.Under MRI safe mode, electrocardiosignal cannot be acquired, the heart can not be made
Dirty pacemaker enters normal working condition, main reasons is that electrocardiosignal faint under MRI environment is submerged in MRI electricity
Among magnetic interference.
To sum up, MRI electromagnetic field can impact the normal use of active implantable medical devices, while can also be in electrode
Conducting wire generates induced current, and then electrode cable is led to problems such as to generate heat, these may cause to damage to patient body.
Summary of the invention
The purpose of the present invention is to provide a kind of filter circuit and electronic device, it is able to suppress as during magnetic resonance imaging
The Electromagnetic Interference of high-power RF (Radio Frequency, RF) signal of sending etc..
To achieve the goals above, the present invention provides a kind of filter circuit, comprising: anode input terminal, cathode input terminal, sun
Pole output end, cathode end, poor common mode filtering module, differential mode filter module and common mode filtering module；Wherein, the poor common mode
Filter module is connected between the anode input terminal and cathode input terminal；The differential mode filter module setting is in the poor common mode
Between the output end of filter module and the input terminal of the common mode filtering module；The common mode filtering module is connected to the anode
Between output end and the cathode end；The difference common mode filtering module and the common mode filtering module all have ground terminal.
Optionally, the poor common mode filtering module includes first capacitor, the second capacitor and third capacitor, first capacitor and the
Two capacitors connect to form the first series arm, one end connection anode input terminal of first series arm, and described first
The pole plate of the other end connection cathode input terminal of series arm, the first capacitor and second capacitance connection is ground connection
End, a pole plate of the third capacitor connect the anode input terminal, and another pole plate of the third capacitor connects the cathode
Input terminal.
Optionally, first capacitor, the second capacitor and the third capacitor in the poor common mode filtering module use an X2Y capacitor
Filter is realized, alternatively, alternatively, realized using three mutually independent capacitors.
Optionally, the differential mode filter module includes the first filter element and the second filter element；Wherein, first filter
Wave element is connected between the anode input terminal and the anode output end；Second filter element is connected to the cathode
Between input terminal and the cathode end.
Optionally, first filter element and second filter element are inductance.
Optionally, the common mode filtering module includes the 4th capacitor and the 5th capacitor, the 4th capacitor and the 5th capacitor
Series connection forms the second series arm, and one end of second series arm connects the anode output end, second series connection
The pole plate of the other end connection cathode end of branch, the 4th capacitor and the 5th capacitance connection is ground terminal.
Optionally, the filter circuit further includes clipping module, clipping module setting the anode input terminal and/
Or the cathode input terminal, the clipping module are used to provide to the poor common mode filtering module by the signal after limited amplitude.
Optionally, the impedance between the anode input terminal and the ground terminal of the poor common mode filtering module is equal to the yin
Impedance between pole input terminal and the ground terminal of the poor common mode filtering module.
Optionally, the filter circuit compares for 30dB the inhibition of the Radio Frequency Interfere within the scope of 30MHz~3GHz
More than.
The present invention also provides a kind of electronic devices, including at least one filter circuit as mentioned.
Optionally, the active medical device further include shell, the inside medical components for being located in the shell portion and
Positioned at the external medical component of the shell exterior；The internal medical components are for receiving and processing physiological signal and/or use
Signal is treated in generating；The external medical component is for contacting biological cell with sense physiological signals and/or being treated；Institute
It states filter circuit to be connected between the internal medical components and the external medical component, using as the internal medical components
Signal transmission passage between the external medical component.
Optionally, the external medical component includes at least one of lead, electrode and sensor；The internal medical treatment
Component includes the sensing module for receiving and processing the physiological signal of the filter circuit transmission, and/or, for generating treatment
The treatment module of signal, the sensing module and the treatment module respectively connect the filter circuit, alternatively, the perception
Module and the treatment module share the same filter circuit.
Compared with prior art, technical solution of the present invention has the advantages that
1, signal is carried out using sequentially connected poor common mode filtering module, differential mode filter module and common mode filtering module
It successively filters, good inhibitory effect can be provided to Electromagnetic Interference signal, and circuit structure is simple, occupies little space.Its
In for example sensu lato radiofrequency signal (300kHz-300GHz) of Electromagnetic Interference signal, the radiofrequency signal that generates during MRI
Or the high band Electromagnetic Interference letter in EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) test
Number and other frequency ranges Electromagnetic Interference signal (such as frequency range is in Electromagnetic Interference signal of kHz kHz).
2, input impedance can be balanced, common mode, differential mode rejection are promoted, improves the sensing or output effect of actual signal
Fruit.
3, the signal of filter circuit output is entirely common-mode signal, will not be produced between anode output end and cathode end
Potential difference caused by raw Electromagnetic Interference signal also just flows through the negative of late-class circuit without electric current caused by Electromagnetic Interference signal
It carries, is thus conducive to improve the late-class circuit further inhibition to Electromagnetic Interference signal that the output end of filter circuit is connected
Attenuating.
4, the first capacitor of the poor common mode filtering module in the filter circuit and the second capacitor can exactly match, so that from
Anode input terminal to the poor common mode filtering module ground terminal impedance and cathode input terminal to the difference common mode filtering module
Ground terminal impedance be it is identical, third capacitor is that DM EMI inhibits capacitor and in the frequency range of Electromagnetic Interference signal
In Low ESR, as a result, being in Low ESR between anode input terminal and cathode input terminal, and then the output of filter circuit is had matched
Hold the impedance of connected late-class circuit, and between anode input terminal and cathode input terminal in Low ESR make anode input terminal with
It is almost connected between cathode input terminal, so that the amplitude of the Electromagnetic Interference signal on anode input terminal and cathode input terminal
It is almost the same, and then reduce reflection and standing wave energy, the induced current in late-class circuit is reduced, is reduced in late-class circuit
Heat generate, ensure that entire circuit using safe.
5, the filter circuit is suitable for active medical device (e.g. Implanted cardiac pacemaker (IPG), active implanted
Defibrillator (ICD) and following cardiac resynchronization therapy defibrillator (CRT-D) etc.), enable to the active medical device in MRI environment
Lower normal use and can guarantee patient using safe.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the filter circuit of the specific embodiment of the invention.
Fig. 2 is the structural schematic diagram of the X2Y capacitor of the specific embodiment of the invention.
Fig. 3 is the circuit transmission characteristic S21 simulation curve of the filter circuit of the specific embodiment of the invention.
Fig. 4 is the structural schematic diagram of the active medical device of the specific embodiment of the invention.
Fig. 5 is the structural schematic diagram of the pacemaker of the specific embodiment of the invention.
Wherein, appended drawing reference is as follows:
10- filter circuit, 11- anode input terminal, the ground terminal of 12- differential mode filter module, 13- cathode input terminal, 14- are poor
Common mode filtering module, 141- shunt capacitance, 142- refer to pole plate, 15- differential mode filter module, 16- common mode filtering module, 17- sun
Pole output end, the ground terminal of 18- common mode filtering module, 19- cathode end, 20- active medical device, the inside 21- medical team
Part, 211- power supply, 212- communication module, 213- memory, 214- treatment module, 214a- pacing module, 215- sensing module,
22- external medical component.
Specific embodiment
To be clearer and more comprehensible the purpose of the present invention, feature, technical solution of the present invention is made with reference to the accompanying drawing detailed
Explanation however, the present invention can be realized with different forms should not be to be confined to the embodiment described.It should be noted that
Attached drawing is all made of very simplified form and using non-accurate ratio, only to convenient, lucidly aid illustration is of the invention
The purpose of embodiment."and/or" herein is meant that alternative or the two have both.
Referring to FIG. 1, the present embodiment provides a kind of filter circuits 10, comprising: anode input terminal 11, cathode input terminal 13,
Anode output end 17, cathode end 19, poor common mode filtering module 14, differential mode filter module 15 and common mode filtering module 16.Its
In, poor common mode filtering module 14 is connected between anode input terminal 11 and cathode input terminal 13；The setting of differential mode filter module 15 exists
Between the output end of poor common mode filtering module 14 and the input terminal of common mode filtering module 16；The differential mode filter module 16 is connected to
Between anode output end 17 and cathode end 19, the difference common mode filtering module 14 and the common mode filtering module 16 are all had
Ground terminal.Anode input terminal 11 and cathode input terminal 13 are used to receive signal from front stage circuits and are transmitted to poor common mode filtering module
14, front stage circuits are, for example, the electrode of pacemaker, and anode output end 17 and cathode end 19 are used for defeated to late-class circuit
Filtered signal out, the sensing module of late-class circuit such as pacemaker (as shown in 215 in Fig. 5).
Wherein, in the signal that poor common mode filtering module 14 is used to that anode input terminal 11 and cathode input terminal 13 to be inhibited to input
DM EMI and common mode interference.Poor common mode filtering module 14 includes first capacitor Cy, the second capacitor Cy ' and third capacitor Cx, the
One capacitor Cy and the second capacitor Cy ' series connection forms the first series arm, and one end of the first series arm is (i.e. after Cy, Cy ' series connection
One end) the A connection anode input terminal 11, the other end B connection cathode input terminal 13 of the first series arm, the first series arm
The middle first capacitor Cy and pole plate G of the second capacitor Cy ' connection is grounded and as the ground terminal 12 of poor common mode filtering module 14 and connects
Ground, third capacitor Cx is in parallel with the first series arm, i.e. one end jointed anode input terminal 11 of third capacitor Cx, third capacitor Cx
The other end connect cathode input terminal 13.First capacitor Cy, the second capacitor Cy ' and third capacitor Cx connect the poor common mode to be formed filter
Wave module 14, circuit structure is simple, conducive to realizing and occupying little space.Further, first capacitor Cy and the second capacitor Cy ' are complete
It is exactly the same, so that impedance that anode input terminal 11 arrives the ground terminal 12 of poor common mode filtering module 14 and cathode input terminal 13 are to poor
The impedance of the ground terminal 12 of common mode filtering module 14 is identical, and then can balance input impedance, promotes poor common mode inhibition
Energy.Third capacitor Cx is that DM EMI inhibits capacitor, and (such as 30MHz~3GHz, i.e. electromagnetic wave are dry in specific radio frequency band
Disturb the frequency range of signal) in Low ESR, so that filter circuit 10 can absorb the Electromagnetic Interference signal incuded in front stage circuits
Most of energy, while reducing reflection and the standing wave of Electromagnetic Interference signal.In addition, because the electricity of first capacitor Cy and second
Hold Cy ' can be it is identical, so anode input terminal 11 to ground terminal 12 impedance and cathode input terminal 11 arrive ground terminal
12 impedance be it is identical, third capacitor Cx be DM EMI inhibit capacitor, when from anode input terminal 11 and cathode input
When the Electromagnetic Interference signal amplitude difference sensed on end 13, which enters poor common mode filtering module 14
Afterwards, third capacitor Cx is in Low ESR in the radio frequency band of the Electromagnetic Interference signal, and the Low ESR of third capacitor Cx makes anode
It is in Low ESR between input terminal 11 and cathode input terminal 13 and is almost connected, to makes anode input terminal 11 and cathode input terminal 13
On Electromagnetic Interference signal amplitude it is almost the same, thus divided equally the energy of Electromagnetic Interference signal, reduced anode input terminal
11 and the heat that is generated by electromagnetic induction of the components such as electrode that connect of cathode input terminal 13.
Wherein, the first capacitor Cy of poor common mode filtering module 14, the second capacitor Cy ' and third capacitor Cx can use three
Mutually independent discrete capacitor is realized, can also use an a kind of X2Y capacitive filter (capacitor integrated
Device) Lai Shixian.Referring to FIG. 2, X2Y capacitive filter is mainly by a single-ended nonequilibrium common shunt capacitance 141 and more
It is a disposed in parallel with reference to the composition of pole plate 142.Two electrode plates G1, G2 are oppositely arranged and will be multiple disposed in parallel with reference to pole plate
142 respective side walls link together, and form parallel construction.Two groups of pole plates A, B of shunt capacitance 141 all have vertical plate and from
On the vertical plate stretch out and perpendicular to the slotting fingerboard of the vertical plate, two vertical plates are parallel to each other and are oppositely arranged, two insert refer to
Plate is arranged in parallel between two vertical plates, and two slotting fingerboards are parallel to reference to pole plate 142, two vertical plates respectively with two
It is vertical to insert fingerboard, electrode plate G1, G2 and reference pole plate 142；Two slotting fingerboards are inserted respectively into disposed in parallel with reference to pole plate
Between 142, electrode plate G1, G2 and two vertical plates by two slotting fingerboards and it is each be enclosed in reference to pole plate 142 in so that
The structure of X2Y capacitive filter is on the whole similar to faraday's inclosure.And pole plate 142 is referred to by single-ended nonequilibrium shunt capacitance
141 are changed into double capacitors of symmetrical balance, and electrode plate G1, G2 and vertical plate form four terminals of X2Y capacitive filter, and electricity
Ground terminal and ground connection of the pole plate G1 or G2 as X2Y capacitive filter.I.e. X2Y capacitive filter is four end structures, relative to
The advantage of the poor common mode filtering module 14 of three discrete capacitors (first capacitor Cy, the second capacitor Cy ' and third capacitor Cx) composition
With following aspect: (1) (double capacitors are right respectively for the double capacitors for the symmetrical balance that single-ended nonequilibrium shunt capacitance 141 is transformed into
Answer first capacitor Cy and the second capacitor Cy '), process matching, voltage is identical with the biasing of temperature, dielectric aging effect phase
Together, therefore input impedance is identical, is conducive to the poor common mode interference rejection for improving poor common mode filtering module 14.(2) in device
Dielectric stress (piezoelectric effect) is on the contrary, can force the electric current in structure reversed, internal-neutralized mutual inductance, to reduce inside
Mutual inductance is conducive to improve poor common mode interference rejection.(3) X2Y capacitive filter work is bypassing, therefore it is by electric current
It limits and does not increase D.C. resistance.(4) package dimension of X2Y capacitive filter increases, and can reduce above-mentioned parallel construction (i.e. two
A electrode plate G1, G2 and it is multiple it is disposed in parallel with reference to pole plate 142 formed parallel construction) inductance so that X2Y capacitor
The corresponding part third capacitor Cx is lower in the impedance of radio frequency band in filter, and this phenomenon is just opposite with conventional capacitive.
(5) part that third capacitor Cx is corresponded in X2Y capacitive filter, in frequency range (such as the 30MHz of specific Electromagnetic Interference signal
~3GHz) it is so that being almost connected between anode input terminal 11 and cathode input terminal 13, to can absorb prime in low-impedance
Most of energy of the Electromagnetic Interference signal incuded on circuit, while reflection and the standing wave of Electromagnetic Interference signal are reduced,
I.e. X2Y capacitive filter is able to suppress the big portion for entering the Electromagnetic Interference signal of anode input terminal 11 and cathode input terminal 13
Point energy reduces the heat that the electromagnetic induction in front stage circuits generates, in this way, the temperature rise in front stage circuits can be controlled compared with
In low range, protection front stage circuits are not damaged.
Differential mode filter module 15 includes in the first filter element and second filter element the present embodiment, and the first filter element is
The first inductance L being connected between anode input terminal 11 and anode output end 17.Second filter element is to be connected to cathode input
The second inductance L ' between end 13 and cathode end 19.First inductance L and the second inductance L ' can produce differential mode High-frequency Interference
Raw biggish induction reactance (being presented as high impedance under high-frequency signal), the electromagnetic wave that can will be exported from poor common mode filtering module 14
DM EMI in interference signal filters out, and prevents it from being added in common mode filtering module 15, therefore differential mode filtering mould may be implemented
The stronger differential mode filtering performance of block 15.Further, the first inductance L and the second inductance L ' is the micro-strip electricity on printed circuit board
Sense, opposite area occupied is small, and the characteristic of high impedance is presented as under high-frequency signal, prevents the stream of high-frequency signal in the line
It is logical, high-frequency signal is reflected back interference source, to play the inhibiting effect to differential mode radiofrequency signal and electromagnetic interference.
The signal that differential mode filter module 15 exports can be converted to common-mode signal by common mode filtering module 16, and late-class circuit
There is comparable inhibition damping capacity to common mode Electromagnetic Interference signal, therefore, common mode filtering module 16 can be conducive to improve
Inhibition damping capacity of the late-class circuit to Electromagnetic Interference signal.In the present embodiment, common mode filtering module 16 includes the 4th capacitor
C4 and the 5th capacitor C5, the 4th capacitor C4 and the 5th capacitor C5 connect to form the second series arm, and the one of the second series arm
End jointed anode output end 17 (is alternatively connected on the circuit node that the first inductance L1 and anode output end 17 connect), the
The other end connection cathode end 19 of two series arms (is alternatively connected to the second inductance L2 and cathode end 19 connects
Circuit node on), the 4th capacitor C4 and the pole plate of the 5th capacitor C5 connection ground connection and filtered as common mode in the second series arm
The ground terminal of wave module 16.The common mode filtering module 16 that 4th capacitor C4 and the 5th capacitor C5 is formed, structure is simple, area occupied
It is small, it is conducive to realize.Further, the 4th capacitor C4 and the 5th capacitor C5 are identical, to improve the common mode of the signal of output
Energy.And the 4th capacitor C4 and the 5th capacitor C5 Electromagnetic Interference signal frequency range be in Low ESR, enter common mode filtering module
The energy of 16 Electromagnetic Interference signal returns to ground terminal 18 by the 4th capacitor C4 and the 5th capacitor C5, thus by the difference of prime
Remaining common mode interference filters out after mould filter module 15 filters, and prevents it from being added in the circuit of rear class.
The filter circuit 10 of the present embodiment, integrated circuit form a π type bandstop filter, and structure is simple, and can have
Effect inhibits radiofrequency signal.
In addition, the type selecting of each component in filter circuit 10 needs to match MRI high-power RF signal or EMC test
In Electromagnetic Interference signal.The type selecting of each component of the present embodiment, enables to filter circuit 10 to 30MHz~3GHz
Radio Frequency Interfere in range reaches the inhibition ratio of 30dB or more.Such as first the parameter of inductance L and the second inductance L ' include:
Inductance value is 12nH ± 10%, and quality factor are 12 ± 10%, and parasitic capacitance is 0.25pF ± 10%.First to the 5th capacitor
Parameter includes: that capacitance is 4.7nF ± 10%, and impedance is 0.21 Ω ± 10%, and parasitic inductance is 0.5nH ± 10%.Fig. 3 is shown
The circuit transmission characteristic S21 simulation curve of filter circuit 10 with these components selection parameters, can from Fig. 3
Out, which is that 30dB or more (in other words, decays to the pad value of Frequency point each within the scope of 30MHz~3GHz
Value is respectively less than -30dB), for example, the decaying of the Radio Frequency Interfere of correspondence MRI 1.5T (tesla), rf frequency RF 64MHz
Value is -55dB, and the pad value for corresponding to the Radio Frequency Interfere of MRI 3.0T, RF 128MHz is -70dB, and MRI higher hamonic wave is fallen in
It is attenuated in band, the pad value of the RF 30MHz Electromagnetic Interference signal in corresponding EMC test is -35dB, in corresponding EMC test
RF 3.0GHz Electromagnetic Interference signal pad value be -55dB.
Further, the filter circuit 10 of the present embodiment further includes that clipping module (can be Transient Suppression Diode array
It is TVS Array, not shown), clipping module setting is in anode input terminal 11 and/or cathode input terminal 13, for poor common mode
Filter module 14 is provided by the radiofrequency signal after limited amplitude.Such as 64MHz radiofrequency signal is issued when 1.5T MRI scan, pass through
64MHz radiofrequency signal is sensed after front stage circuits, is generated after passing to anode input terminal 11 and cathode input terminal 13 with up to several
The 64MHz Radio Frequency Interfere of ten volts of voltage, the Radio Frequency Interfere enter the clipping module amplitude quilt of filter circuit 10
To 10Vp-p, (i.e. crest voltage is 10V) to clamper；Pass through poor common mode filtering module 14, differential mode filter module 15 and common mode later
The amplitude of the Radio Frequency Interfere of 64MHz is dropped to 20mVp-p (i.e. peak value electricity from 10Vp-p by the successively filtering of filter module 16
Pressure is 20mV)；It is subsequent further to be decayed by late-class circuit to the Radio Frequency Interfere, it is dry with the nothing for finally obtaining required
The 64MHz radiofrequency signal disturbed, such as it is at least by attenuation outside a channel in late-class circuit the traffic filter of 40dB, by filter circuit
The amplitude of the Radio Frequency Interfere of 10 outputs from 20mVp-p drops to 0.02mVp-p~0.2mVp-p, and (i.e. crest voltage is
0.02mV~0.2mV)；It will further be penetrated by the perception amplifier that common-mode rejection ratio in late-class circuit is 40dB~60dB
The amplitude of frequency interference signal drops to 0.2 μ of μ Vp-p~2 Vp-p (i.e. crest voltage is 0.2 μ of μ V~2 V), so that rear class is electric
Perception amplifier in road can be perceived and be acquired to such as electrocardiosignal etc. in MRI environment.
In addition, it should be noted that, the filter circuit 10 of the present embodiment can be similar to be a mirror image, i.e., it is positive
When pole input terminal 11 and cathode input terminal 13 make signal input part, anode output end 17 and cathode end 19 just do signal output
End, and when anode input terminal 11 and cathode input terminal 13 do signal output end, anode output end 17 and cathode end 19 are just
Do signal input part.As a result, it is that the filter circuit 10 positive can access circuit, also can be reversed access circuit.Filter circuit
10 can play corresponding filter effect.Although in addition, mainly being penetrated in above-described embodiment with the MRI within the scope of 30MHz~3GHz
Frequency signal describes the working principle and effect of the filter circuit 10 of the present embodiment as electromagnetic interference signal, but of the invention
Filter circuit is not limited only to using some fields for needing to be filtered the Electromagnetic Interference signal within the scope of 30MHz~3GHz
Scape, also with as needed come change common mode filtering module 14, respective element in differential mode filter module 15 and common mode filtering module 16
The parameter values such as capacitive reactance, impedance, make common mode filtering module 14, differential mode filter module 15 and the equal resonance of common mode filtering module 16 in electricity
In the frequency range of magnetic wave interference signal, and then it can be applied to the field for needing to be filtered the Electromagnetic Interference signal of other frequency ranges
Scape, wherein these Electromagnetic Interference signals generate during can be sensu lato radiofrequency signal (300kHz-300GHz), MRI
Radiofrequency signal or EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) test in high band electricity
The Electromagnetic Interference signal (such as frequency range is in Electromagnetic Interference signal of kHz kHz) of magnetic wave interference signal and other frequency ranges
Deng.
In conclusion filter circuit of the invention, structure is simple, can match the impedance of front stage circuits, reduce reflection and
Standing wave energy reduces front stage circuits induced current, reduces heat and generates, while can also be defeated to balance by poor common mode filtering module
Enter impedance, promote common mode, differential mode rejection, can the Electromagnetic Interference signal to corresponding band there is sizable signal to decay
Effect, such as when common mode filtering module 14, differential mode filter module 15 and the equal resonance 30MHz~3GHz frequency range of common mode filtering module 16
When upper, filter circuit of the invention can achieve -30dB or more to the rejection of the radiofrequency signal of 30MHz~3GHz frequency range.
In addition, when the poor common mode filtering module in filter circuit of the invention using X2Y capacitor to realize when, additionally it is possible to reduce product
Material cost simplifies manufacturing process.Filter circuit of the invention can be adapted for the Electromagnetic Interference signal of various electronic devices
Filtering demands, such as can be adapted for the active doctor in the MRI radiofrequency signal environment for needing work within the scope of 30MHz~3GHz
Treat the MRI Radio Frequency Interfere filtering demands of device.Based on this, one embodiment of the invention also provides a kind of electronic device, asks
With reference to Fig. 4 and Fig. 5, which includes at least one filter circuit 10 as described above.The electronic device, which can be, only to be wrapped
Include the connector or filter of filter circuit 10；Be also possible to include sequentially connected front stage circuits, filter circuit 10 and after
Grade circuit electronic device, have other than filter function and connector function other function (such as computing function, pass
Feel function, medical functions, bio signal detection function etc.).Such as electronic device is the sensor for detecting corresponding signal.Example again
Such as, which is the active medical device for having sense physiological signals and carrying out biological therapy, as an example, the active doctor
Treating device can be active contact organism instrument, and active contact organism instrument includes implanted electric stimulator, energy therapy
Instrument, diagnosis monitoring instrument, liquid conveyer tool or ionising radiation instrument.Wherein, implanted electric stimulator is according to stimulation location
Difference, pacemaker, brain depth stimulator, spinal stimulator, peripheral nerve stimulation device, muscle stimulator, bone can be divided into
Stimulator, gastric stimulator, ear stimulator etc.；Energy therapy instrument such as laser therapeutic apparantus, sonicator, magnet therapeutic apparatus etc.；It examines
Disconnected monitoring instrument such as Holter monitor, pH probe, implantable sensor, pill cameras, external neurostimulators
Deng liquid conveyer tool such as Teat pipette, external insulin pump, external drug pump, outer conduit etc.；Ionising radiation instrument such as X
X-ray machine X etc..
As an example, Fig. 4 and Fig. 5 are please referred to, which further includes shell in addition to filter circuit 10
23, the inside medical components 21 inside shell 23 and the external medical component 22 outside shell 10.Wherein, it filters
Circuit 10 can be connector, be connected between internal medical components 21 and external medical component 22, to provide internal medical treatment
Signal transmission passage between component 21 and external medical component 22, filter circuit 10 a part of can be located at shell 23 at this time
Inside, another part, which is located on the outside of shell 23 or the side wall of shell 23, through hole, the filter circuit as connector
10 insertion through holes and the lateral wall that shell 23 will not be protruded from.In other embodiments of the invention, filter circuit 10 is gone back
It can be integrated on the same printed circuit board with internal medical components 21, and the printed circuit board is arranged inside shell 23.
Internal medical components 21 treat signal for receiving and processing physiological signal and/or for generating, in the present embodiment,
Internal medical components 21 include controller 210, power supply 211, communication module 212, memory 213, treatment module 214 and perception
Module 215.Power supply 211 be filter circuit 10 and each internal medical components 21 work is provided needed for electric power, communication module
212 (such as can be cured with receiving the data such as extraneous system control parameters by wired or wirelessly communication with the outside world
The raw information parameter that active medical device is set and is used to treat and monitor conditions of patients), and internal medical components 21 are given birth to
The data such as object sign information are transmitted outward, and memory 213 is for storing corresponding data and parameter, and treatment module 214 is for producing
Raw treatment signal, sensing module 215 are used to receive and process the physiological signal of the transmission of filter circuit 10, and controller 210 is for controlling
Make and coordinate the work of each filter circuit 10 and each internal medical components 21.In the present embodiment, sensing module 215 and control
It treats module 214 and shares the same filter circuit 10, at this point, one of an input terminal of sensing module 215 and treatment module 214
Output end connects the anode input terminal 11 of filter circuit 10, another input terminal and treatment module 214 of sensing module 215 jointly
Another output connect the cathode input terminal 13 of filter circuit 10 jointly so that filter circuit 10 both can be to sensing module
215 received signals are filtered, and also be can permit the signal that treatment module 214 is sent and are transmitted to external medical component 22, very
It is also filtered to the signal sent to treatment module 214, it is possible thereby to avoid the area occupied of more filter circuits, favorably
In the micromation of active medical device.In other embodiments of the invention, sensing module 215 and treatment module 214 can be each
A filter circuit 10 is connected, so that treatment module 214 and sensing module 215 are built between external medical component 22 respectively
Vertical signal transmission passage, between 215 received signal of signal and sensing module for avoiding treatment module 214 from sending there are strings
It disturbs.
External medical component 22 may include drawing for contacting biological cell with sense physiological signals and/or being treated
At least one of line, electrode and sensor.
Below by taking pacemaker as an example, it is used to fill into active medical the filter circuit of the present embodiment is described in detail
The filtering effect of MRI high-power RF signal within the scope of the 30MHz~3GHz set and the Electromagnetic Interference signal in EMC test
Fruit.
When active medical device is pacemaker, Fig. 1 and 5, the sensing module in internal medical components 21 are please referred to
215 for perceiving electrocardiosignal, and (also known as pulse is defeated for the pacing module for generating cardiac pacing signal for treatment module 214
Circuit out is denoted as pacing module 214a below), communication module 212 can be wireless communication module, can be by bluetooth, infrared
Etc. modes communicate with extraneous program control instrument, it is all inside medical components 21 be otherwise known as impulse generator, communication module 212 passes through
Wireless mode realizes the data exchange between program control instrument and impulse generator, for example, realize program control instrument sent to impulse generator or
Control parameter is modified, and realizes that program control instrument receives the physiological signal of operating state signal and detection from impulse generator, it is external
Medical components 22 include at least one electrode (being referred to as electrode cable, be denoted as electrode 22 below), sensing module 215 and rise
Module of fighting 214a shares a filter circuit 10, at this point, one of an input terminal of sensing module 215 and pacing module 214a
Output end connects the anode input terminal 11 of filter circuit 10, another input terminal and pacing module of sensing module 215 jointly
The another output of 214a connects the cathode input terminal 13 of filter circuit 10 jointly, and electrode 22 connects the anode of filter circuit 10
Output end 17 and cathode end 19.
Shell 23 can according to need select connection filter circuit 10 poor common mode filtering module 14 ground terminal 12 with
Ground connection, alternatively, the anode input terminal 11 of the poor common mode filtering module 14 of selection connection filter circuit 10.
Sensing module 215 includes perception amplifier (not shown) and perceptual filter (not shown), the phase of perceptual filter
The anode output end 17 and cathode end 19 of input terminal connection filter circuit 10 are answered, the output end of perceptual filter connects perception
The input terminal of amplifier, perceptual filter and perception amplifier can successively the common mode filtering module 16 to filter circuit 10 export
Signal carry out further filtering inhibit, thus, it is possible to obtain the desired signal of higher performance.
Filter circuit 10 can be absorbed into the letter of the MRI high-power RF within the scope of 30MHz~3GHz of pacemaker
Number and EMC test in Electromagnetic Interference signal, make pacemaker that can have the Electromagnetic Interferences such as MRI high-power RF signal
The electrocardiosignal in the chambers of the heart is normally perceived in environment, while matching the impedance of the electrode 22 of pacemaker, reduces reflection and is stayed
Wave energy allows the patient for being implanted with the pacemaker to carry out MRI and sweeps to reduce the heat generated on electrode 22
It retouches.The pacemaker with the filter circuit 10 can also remove EMC test from according to national standard.
Being designed in resonance on 64MHz with sending 64MHz radiofrequency signal and filter circuit 10 when 1.5T MRI scan is
Example, please refers to Fig. 1, Fig. 5, filter circuit 10 is able to suppress 64MHz MRI radiofrequency signal, makes the trouble for being implanted with the pacemaker
Person can be carried out MRI scan, and concrete principle is as follows:
Firstly, electrocardiosignal spectrum concentration, at low-frequency range (0.5Hz~150Hz), amplitude is about 0.4mV, pacemaker
Need to acquire electrocardiosignal to guarantee to work normally in patient's body, it is therefore desirable to inhibit other interference signals such as myoelectricity,
That is the signal in addition to the electrocardiosignal in the chambers of the heart be all it is unwanted, pacemaker is implanted electrode into the human body
22 will receive the induction of all kinds of electromagnetic wave signals and generate interference, the radiofrequency signal wherein issued when MRI scan, to cardiac pacing
It is a kind of strong jamming for device.
Electrode 22 senses the 64MHz radiofrequency signal issued when MRI scan, and pacemaker uses the shell 23 of Titanium
Signal shielding is carried out, not shielded 64MHz radiofrequency signal passes to feedthrough ports (the i.e. filtered electrical of pacemaker through electrode 22
The anode input terminal 11 and cathode input terminal 13 on road 10) generate 64MHz Radio Frequency Interfere, and the 64MHz Radio Frequency Interfere
The voltage generated between anode input terminal 11 and cathode input terminal 13 is up to tens volts, and the clipping module in filter circuit 10 will
To 10Vp-p, the 64MHz Radio Frequency Interfere after being limited continues into the amplitude clamper of the 64MHz Radio Frequency Interfere
Poor common mode filtering module 14 in filter circuit 10.
Due to the pole plate connected with outer casing 23 of the connection of first capacitor Cy and the second capacitor Cy in poor common mode filtering module 14
And be grounded, therefore most of interference signal energy can be re-transmitted to shell 23, thus it can absorb what electrode 22 incuded
Most of energy of 64MHz Radio Frequency Interfere, while reflection and the standing wave of 64MHz Radio Frequency Interfere are reduced, further
Because first capacitor Cy and the second capacitor Cy be it is identical, so anode input terminal 11 to shell 23 impedance with and cathode it is defeated
It is identical for entering the impedance of 13 to shell 23 of end, and the third capacitor Cx in poor common mode filtering module 14 is in 64MHz radio frequency frequency
Section is in Low ESR, so that being connected in Low ESR and almost between anode input terminal 11 and cathode input terminal 13, anode input
The amplitude of end 11 and the Radio Frequency Interfere on cathode input terminal 13 is almost the same, has divided equally radio frequency interference energy, reduces electrode
The heat that 22 radio frequency induction (i.e. electromagnetic induction) generates.
The energy of the remainder of the 64MHz Radio Frequency Interfere passes through (such as the printed circuit board of differential mode filter module 15
On micro-strip inductance) afterwards further filtering inhibit after enter common mode filtering module 16, due to the 4th in common mode filtering module 16
The resonance of capacitor C4 and the 5th capacitor C5 can be in Low ESR to the 64MHz Radio Frequency Interfere near 64MHz, and further
The dump energy of the 64MHz Radio Frequency Interfere is absorbed, and the 64MHz Radio Frequency Interfere is switched into common-mode signal output.This
In embodiment, filter circuit 10 has the rejection ability of 55dB to 64MHz Radio Frequency Interfere, that is to say, that attenuation is greater than
500 times, 64MHz Radio Frequency Interfere is filtered through poor common mode filtering module 14, differential mode filter module 15 and common mode filtering module 16
After wave, amplitude can drop to 20mVp-p by the amplitude of 10Vp-p.
At this point, the input of the sensing module 215 of pacemaker has not been entered into saturation state, perceptual filter is band logical
Filter, attenuation outside a channel are at least 40dB, therefore 64MHz Radio Frequency Interfere is after perceptual filter further filters,
Its amplitude can drop to 0.02~0.2mVp-p from 20mVp-p, further, since the signal that common mode filtering module 16 exports is common mode
Signal, perceptual filter are bandpass filter, will not change the common mode characteristic of signal；Therefore, 64MHz Radio Frequency Interfere passes
Still it is common mode interference signal when the defeated amplifier to perception, and perceives the common-mode rejection ratio that amplifier has 40~60dB, therefore,
For 64MHz Radio Frequency Interfere after perception amplifier further suppresses, amplitude drops to 0.2 μ Vp- from 0.02~0.2mVp-p
The μ of p~2 Vp-p (i.e. crest voltage is 0.2 μ of μ V~2 V).That is, the 64MHz radio frequency that final 64MHz MRI scan generates is dry
Signal is disturbed after the filtering of filter circuit 10 and the inhibition of sensing module 215 itself, is perceived compared to sensing module 215
The chambers of the heart in low similar three orders of magnitude of electrocardiosignal (amplitude is about 0.4mV), this would not influence electrocardiosignal
Detection.
In addition, by the reasonable setting of the electronic component parameter in each module in the filter circuit 10, the filter circuit
The 10 Radio Frequency Interfere upper frequency limits being able to suppress can be up to 3GHz, and can achieve 30MHz~3GHz EMC in national standard
The anti-interference ability of test request is greater than the inspection-free level of 30dB decaying, in turn, the pacemaker with the filter circuit 10
It equally can operate under other MRI scan environment such as 3.0T MRI, radio frequency 128MHz.Wherein, EMC test includes two sides
The requirement in face: on the one hand refer to equipment in normal course of operation to place environment generate electromagnetic interference no more than certain
Limit value；On the other hand refer to that utensil has a degree of immunity to interference to electromagnetic interference present in the environment of place, i.e. electromagnetism is quick
Perception.
In conclusion the pacemaker of the present embodiment, due to using the filter circuit of the present embodiment, and passes through the filter
Therefore wave circuit, which carries out sizable signal decaying to the MRI radiofrequency signal entered in pacemaker, can make heart
Pacemaker also normally can be perceived and be acquired to electrocardiosignal in MRI environment, and can reduce electrode cable in MRI scan
When the heat that generates, guarantee the safety of patient.Meanwhile in terms of EMC test, pacemaker passes through the filtering of the filter circuit
Effect, can reach 30dB or more to the rejection of the electromagnetic interference signal in 30MHz~3GHz radio frequency range, according to state
Family's standard can remove EMC test from.
It should be noted that the electronic device of other filter circuits with the present embodiment, with the filter with the present embodiment
The pacemaker of wave circuit is the same, also can be used in the interference environment of MRI high-power RF signal of 30MHz~3GHz.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention
And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it
Interior, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of filter circuit characterized by comprising anode input terminal, cathode input terminal, anode output end, cathode output
End, poor common mode filtering module, differential mode filter module and common mode filtering module；Wherein, the poor common mode filtering module is connected to institute
It states between anode input terminal and cathode input terminal；The output end of the poor common mode filtering module is arranged in the differential mode filter module
Between the input terminal of the common mode filtering module；The common mode filtering module is connected to the anode output end and the cathode
Between output end；The difference common mode filtering module and the common mode filtering module respectively include ground terminal.
2. filter circuit as described in claim 1, which is characterized in that the difference common mode filtering module includes first capacitor, the
Two capacitors and third capacitor, first capacitor and the second capacitor connect to form the first series arm, and the one of first series arm
End connects the anode input terminal, and the other end of first series arm connects the cathode input terminal, the first capacitor
Pole plate with second capacitance connection is ground terminal, and a pole plate of the third capacitor connects the anode input terminal, described
Another pole plate of third capacitor connects the cathode input terminal.
3. filter circuit as claimed in claim 2, which is characterized in that first capacitor in the difference common mode filtering module, the
Two capacitors and third capacitor are realized using an X2Y capacitive filter, alternatively, using three mutually independent capacitors come real
It is existing.
4. filter circuit as described in claim 1, which is characterized in that the differential mode filter module include the first filter element and
Second filter element；Wherein, first filter element is connected between the anode input terminal and the anode output end；Institute
The second filter element is stated to be connected between the cathode input terminal and the cathode end.
5. filter circuit as claimed in claim 4, which is characterized in that first filter element and second filter element
It is inductance.
6. filter circuit as described in claim 1, which is characterized in that the common mode filtering module includes the 4th capacitor and the 5th
Capacitor, the 4th capacitor and the 5th capacitor connect to form the second series arm, and one end connection of second series arm
The other end of the anode output end, second series arm connects the cathode end, the 4th capacitor and the 5th capacitor
The pole plate of connection is ground terminal.
7. such as filter circuit according to any one of claims 1 to 6, which is characterized in that the filter circuit further includes clipping
Module, in the anode input terminal and/or the cathode input terminal, the clipping module is used for institute for the clipping module setting
Poor common mode filtering module is stated to provide by the signal after limited amplitude.
8. filter circuit as described in claim 1, which is characterized in that the anode input terminal and the poor common mode filtering module
Ground terminal between impedance be equal to the impedance between the cathode input terminal and the ground terminal of the poor common mode filtering module.
9. filter circuit as described in claim 1, which is characterized in that the filter circuit is within the scope of 30MHz~3GHz
The inhibition of Radio Frequency Interfere is compared for 30dB or more.
10. a kind of electronic device, which is characterized in that including at least one filtered electrical as claimed in any one of claims 1-9 wherein
Road.
11. electronic device described in any one of claim 10, which is characterized in that the electronic device is active medical device, described to have
Source medical device further includes shell, the inside medical components for being located in the shell portion and positioned at the outside of the shell exterior
Medical components；The internal medical components are for receiving and processing physiological signal and/or for generating treatment signal；The outside
Medical components are for contacting biological cell with sense physiological signals and/or being treated；The filter circuit is connected in described
Between portion's medical components and the external medical component, as between the internal medical components and the external medical component
Signal transmission passage.
12. electronic device as claimed in claim 11, which is characterized in that the external medical component include lead, electrode and
At least one of sensor；The internal medical components include the physiology letter for receiving and processing the filter circuit transmission
Number sensing module, and/or, for generate treatment signal treatment module, the sensing module and the treatment module respectively connect
The filter circuit is connect, alternatively, the sensing module and the treatment module share the same filter circuit.
Priority Applications (2)
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| CN201910803568.XA CN110456291B (en) | 2019-08-28 | 2019-08-28 | Filter circuit and electronic device |
| PCT/CN2020/111868 WO2021037169A1 (en) | 2019-08-28 | 2020-08-27 | Filter circuit and electronic apparatus |
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|---|---|---|---|
| CN201910803568.XA CN110456291B (en) | 2019-08-28 | 2019-08-28 | Filter circuit and electronic device |
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| CN110456291B CN110456291B (en) | 2021-12-24 |
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| WO (1) | WO2021037169A1 (en) |
Cited By (4)
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| CN110916655A (en) * | 2019-12-13 | 2020-03-27 | 北京理工大学 | Portable electroencephalogram acquisition system |
| WO2021037169A1 (en) * | 2019-08-28 | 2021-03-04 | 创领心律管理医疗器械（上海）有限公司 | Filter circuit and electronic apparatus |
| CN116800284A (en) * | 2023-07-18 | 2023-09-22 | 北京捷星电子科技有限公司 | Bluetooth multimedia radio |
| CN117849439A (en) * | 2024-03-08 | 2024-04-09 | 成都新欣神风电子科技有限公司 | Magnetic balance type current sensor |
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| CN113546320A (en) * | 2021-07-21 | 2021-10-26 | 丹源医学科技(杭州)有限公司 | Implantable pacemaker and remote monitoring system thereof |
| CN114607363B (en) * | 2022-03-22 | 2023-05-09 | 电子科技大学 | Common mode inhibition method for electromagnetic induction logging |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021037169A1 (en) | 2021-03-04 |
| CN110456291B (en) | 2021-12-24 |
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