CN102590631A - Detection circuit for detecting contact impedance between high-frequency electrotome neutral polar plate and patient - Google Patents
Detection circuit for detecting contact impedance between high-frequency electrotome neutral polar plate and patient Download PDFInfo
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- CN102590631A CN102590631A CN2012100699619A CN201210069961A CN102590631A CN 102590631 A CN102590631 A CN 102590631A CN 2012100699619 A CN2012100699619 A CN 2012100699619A CN 201210069961 A CN201210069961 A CN 201210069961A CN 102590631 A CN102590631 A CN 102590631A
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Abstract
The invention provides a detection circuit for detecting contact impedance between a high-frequency electrotome neutral polar plate and a patient. The detection circuit comprises a double-plate neutral polar plate input end, an impedance transformation transformer, a full bridge impedance detection circuit, an adjustable gain subtracter and an analog/digital (A/D) sampling output end which are connected with one another sequentially, and a frequency generator and a voltage reference source circuit which are connected with the full bridge impedance detection circuit and the adjustable gain subtracter respectively. The change of the contact impedance between the double-plate neutral polar plate and the patient directly influences the voltage output of the full bridge impedance detection circuit, so that the change condition of the contact impedance can be known by measuring the output voltage and good contact or not can be judged; the frequency generator with a dead zone avoids damage to the circuit and error of the measuring result when the full bridge impedance detection circuit is conducted simultaneously; in addition, the adjustable gain subtracter and the voltage reference source circuit can solve the problem that the A/D sampling can not be facilitated due to small change range of the contact impedance and the problem of different output voltage of the full bridge impedance detection circuit caused by difference of electronic components.
Description
[technical field]
The invention belongs to the electric knife technical field, especially relate to a kind of testing circuit that is used for the neutral pole plate of electric knife and patient's contact impedance.
[background technology]
Up to the present, traditional electric knife all will use neutral pole plate in clinical use; And great majority adopt one chip neutral pole plate structures, when using this neutral pole plate since can not know contact with the patient whether good; In case neutral pole plate and patient's loose contact occur; Will cause patient's electrical burn of skin, now a lot of for this reason producers adopt double-disk neutral pole plate structure instead, at this moment will design one and be applicable to the testing circuit that detects the neutral pole plate of double-disk.
In the electric knife actual design process; We find when the neutral pole plate of double-disk contacts with the patient, to have certain impedance; The size of this impedance has directly with the area that the patient contacts with neutral pole plate gets in touch; Bigger its contact impedance of contact area is just more little, utilizes this phenomenon, and we have designed a testing circuit that can detect neutral pole plate and patient's contact impedance size.
[summary of the invention]
In order to solve the above-mentioned technical matters that exists in the prior art; The invention provides a kind of testing circuit that is used for the neutral pole plate of electric knife and patient's contact impedance; This testing circuit is through detecting the situation of change of the neutral pole plate of double-disk and patient's contact impedance; Judge that whether the neutral pole plate of double-disk contacts well with the patient, to prevent the patient by electric injury, improves safety in utilization.
The present invention solves the technical scheme that the prior art problem adopted:
A kind of testing circuit that is used for electric knife neutral electrode and patient's contact impedance includes the neutral pole plate input end of the double-disk that connects successively, impedance conversion transformer, full-bridge impedance detection circuit and A/D sampling output terminal; Wherein,
The neutral pole plate input end of said double-disk includes two input ends, and is connected with the neutral pole plate of double-disk respectively;
Said impedance conversion transformer is mainly used in realization the neutral pole plate of double-disk and patient's contact impedance is transformed in this testing circuit, and is connected with said full-bridge impedance detection circuit as the load that can change impedance;
Said full-bridge impedance detection circuit is mainly used in output voltage, and through behind the adjustable gain subtracter adjustment voltage, sends into MCU through A/D sampling output terminal again and carry out the A/D sampling.
As optimized technical scheme of the present invention; Said impedance conversion transformer mainly is made up of an inductance transformer T, three resistance R 10～R12 and two electric capacity (C11, C12), and the end that said impedance conversion transformer is provided with resistance R 12 and two electric capacity (C11, C12) is connected with the neutral pole plate input end of double-disk; Said full-bridge impedance detection circuit mainly is made up of four metal-oxide-semiconductor Q1～Q4, and said metal-oxide-semiconductor Q1 is connected with resistance R 10 with the resistance R 11 of the said impedance conversion transformer other end respectively with Q4, triode Q2 and Q3.
As optimized technical scheme of the present invention; This testing circuit also includes frequency generator; Said frequency generator is connected with said full-bridge impedance detection circuit, is mainly used in to produce two square waves that frequency is identical, phase place is opposite, offers said full-bridge impedance detection circuit.
As optimized technical scheme of the present invention; This testing circuit also includes said adjustable gain subtracter and voltage reference source circuit; Said adjustable gain subtracter is located between said full-bridge impedance detection circuit and the A/D sampling output terminal; And interconnect, said voltage reference source circuit mainly is made up of voltage stabilizing reference source and voltage follower, and said voltage stabilizing reference source is connected with said adjustable gain subtracter through behind the voltage follower.
As optimized technical scheme of the present invention; Said adjustable gain subtracter mainly is made up of an amplifier U5B and three resistance R 1～R3; Said three resistance R 1～R3 are connected with said frequency generator; Said amplifier U5B is a dual operational amplifier, and its in-phase end is connected with the voltage output end of said full-bridge impedance detection circuit, and said voltage stabilizing reference source is connected with the end of oppisite phase of said adjustable gain subtracter through behind the voltage follower.
As optimized technical scheme of the present invention, said voltage stabilizing reference source is three end adjustable reference sources, and said voltage follower is a dual operational amplifier, and said frequency generator is the waveform generator of a band Dead Time.
As optimized technical scheme of the present invention; Said frequency generator is the waveform generator of TL494 model; The dual operational amplifier of said adjustable gain subtracter is the amplifier of LM358 model; Said voltage stabilizing reference source is three end adjustable reference sources of TL431 model, and the said voltage follower of voltage reference source circuit is the amplifier of LM358 model.
Beneficial effect of the present invention is following:
The present invention passes through technique scheme; The variation of the neutral pole plate of double-disk and patient's contact impedance can directly have influence on the variation of the output voltage of full-bridge impedance detection circuit, then through behind the adjustable gain subtracter adjustment voltage; Send into MCU through A/D sampling output terminal again; Carry out A/D sampling, through the voltage of this variation being measured the situation of change that just can know the neutral pole plate of double-disk and patient's contact impedance, and judge thus whether double-disk neutrality pole plate contacts well with the patient; And frequency generator is the waveform generator of a band Dead Time, effectively avoids finally causing the damage of circuit and the mistake of measurement result because some differences that electronic component exists cause metal-oxide-semiconductor Q1～Q4 conducting simultaneously of full-bridge impedance detection circuit; Add; Adjustable gain subtracter and voltage reference source circuit have been introduced; Ideally solved because the variation range of the neutral pole plate of full-bridge impedance detection circuit measurement double-disk and patient's contact impedance is smaller, the change in voltage situation of output is unfavorable for that MCU carries out the problem of A/D sampling, and because the difference of different electric sub-element; When the external fixing resistance of this testing circuit, the problem of some difference of voltage of full-bridge impedance detection circuit output.
[description of drawings]
Fig. 1 is the structural principle block diagram of testing circuit according to the invention;
Fig. 2 is the circuit diagram of testing circuit embodiment according to the invention.
[embodiment]
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated.
Shown in Fig. 1 and Fig. 2:
A kind of testing circuit that is used for the neutral pole plate of electric knife and patient's contact impedance of the present invention; Include successively the neutral pole plate input end of the double-disk that connects 1, impedance conversion transformer 2, full-bridge impedance detection circuit 3, adjustable gain subtracter 4 and A/D sampling output terminal 5, and the frequency generator 6 and the voltage reference source circuit 7 that are connected with adjustable gain subtracter 4 with said full-bridge impedance detection circuit 3 respectively.Wherein, the neutral pole plate input end 1 of double-disk includes two input ends altogether, and is connected with the neutral pole plate of double-disk respectively; Impedance conversion transformer 2 mainly is made up of an inductance transformer T, three resistance R 10～R12 and two electric capacity (C11, C12); And impedance conversion transformer 2 is connected with the neutral pole plate input end 1 of end of two electric capacity (C11, C12) and double-disk; Being mainly used in realization is transformed into the neutral pole plate of double-disk and patient's contact impedance in the testing circuit of the present invention; Both can play buffer action with electric knife medium-high frequency power amplifier and testing circuit of the present invention; Can play the effect that changes this testing circuit middle impedance again, and be connected with full-bridge impedance detection circuit 3 as the load that can change impedance; Full-bridge impedance detection circuit 3 mainly is made up of four metal-oxide-semiconductor Q1～Q4, and metal-oxide-semiconductor Q1 is connected with electric capacity R10 with the electric capacity R11 of impedance conversion transformer 2 other ends respectively with Q4, metal-oxide-semiconductor Q2 and Q3.Like this; The variation of the neutral pole plate of double-disk and patient's contact impedance directly has influence on the variation of the output voltage of full-bridge impedance detection circuit 3, then through behind the adjustable gain subtracter 4 adjustment voltages; Send into MCU through A/D sampling output terminal 5 again; Carry out A/D sampling, we are through measuring the situation of change that just can know the neutral pole plate of double-disk and patient's contact impedance to the voltage of this variation, and judge thus whether double-disk neutrality pole plate contacts well with the patient.
Said frequency generator (U1) 6 is waveform generators (is TL494 like model) of a band Dead Time; It is mainly used in and produces two square waves that frequency is identical, phase place is opposite; And offer metal-oxide-semiconductor Q1 and Q3, metal-oxide-semiconductor Q2 and the Q4 in the full-bridge impedance detection circuit 3 respectively; Can effectively avoid finally causing the damage of circuit and the mistake of measurement result because some differences that electronic component exists cause metal-oxide-semiconductor Q1～Q4 conducting simultaneously of full-bridge impedance detection circuit 3.
Said adjustable gain subtracter 4 mainly is made up of amplifier U5B, three resistance R 17～R19, and amplifier U5B is a dual operational amplifier (is LM358 like model), and its in-phase end is connected with the voltage output end of full-bridge impedance detection circuit 3; Said voltage reference source circuit 7 mainly is made up of voltage stabilizing reference source (U4) and voltage follower (U5A); And voltage stabilizing reference source (U4) is a high-performance three end adjustable reference sources (is TL431 like model); And be connected through the end of oppisite phase of the dual operational amplifier (U5B) in voltage follower (this voltage follower is a dual operational amplifier, is LM358 like model) back and the adjustable gain subtracter 4.Like this; Can satisfy the requirement of A/D sampling through the voltage range of exporting behind the adjustable gain subtracter; Ideally solved because the variation range of the full-bridge impedance detection circuit neutral pole plate of 3 measurement double-disks and patient's contact impedance is smaller, and the change in voltage situation of output is unfavorable for that MCU carries out the problem of A/D sampling, and because the difference of different electric sub-element; When the external fixing resistance of this testing circuit, the problem of some difference of voltage of full-bridge impedance detection circuit 3 outputs.
Above content is to combine concrete optimal technical scheme to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (7)
1. a testing circuit that is used for the neutral pole plate of electric knife and patient's contact impedance is characterized in that: include the neutral pole plate input end (1) of the double-disk that connects successively, impedance conversion transformer (2), full-bridge impedance detection circuit (3) and A/D sampling output terminal (5); Wherein,
The neutral pole plate input end of said double-disk (1) includes two input ends, and is connected with the neutral pole plate of double-disk respectively;
Said impedance conversion transformer (2) is mainly used in realization the neutral pole plate of double-disk and patient's contact impedance is transformed in this testing circuit, and is connected with said full-bridge impedance detection circuit (3) as the load that can change impedance;
Said full-bridge impedance detection circuit (3) is mainly used in output voltage, and through behind adjustable gain subtracter (4) the adjustment voltage, sends into MCU through A/D sampling output terminal (5) again and carry out the A/D sampling.
2. testing circuit according to claim 1; It is characterized in that: said impedance conversion transformer (2) mainly is made up of an inductance transformer T, three resistance R 10～R12 and two electric capacity (C11, C12), and is connected with the neutral pole plate input end of double-disk (1) with a end that said impedance conversion transformer (2) is provided with resistance R 12 and two electric capacity (C11, C12); Said full-bridge impedance detection circuit (3) mainly is made up of four metal-oxide-semiconductor Q1～Q4, and said metal-oxide-semiconductor Q1 is connected with resistance R 10 with the resistance R 11 of said impedance conversion transformer (1) other end respectively with Q4, metal-oxide-semiconductor Q2 and Q3.
3. testing circuit according to claim 1 and 2; It is characterized in that: this testing circuit also includes frequency generator (6); Said frequency generator (6) is connected with said full-bridge impedance detection circuit (3); Be mainly used in and produce two square waves that frequency is identical, phase place is opposite, offer said full-bridge impedance detection circuit (3).
4. testing circuit according to claim 3; It is characterized in that: this testing circuit also includes said adjustable gain subtracter (4) and voltage reference source circuit (7); Said adjustable gain subtracter (4) is located between said full-bridge impedance detection circuit (3) and the A/D sampling output terminal (5); And interconnect; Said voltage reference source circuit (7) mainly is made up of voltage stabilizing reference source and voltage follower, and said voltage stabilizing reference source is connected with said adjustable gain subtracter (4) through behind the voltage follower.
5. testing circuit according to claim 4; It is characterized in that: said adjustable gain subtracter (4) mainly is made up of an amplifier U5B and three resistance R 1～R3; Said three resistance R 1～R3 are connected with said frequency generator (6); Said amplifier U5B is a dual operational amplifier, and its in-phase end is connected with the voltage output end of said full-bridge impedance detection circuit (3), and said voltage stabilizing reference source is connected with the end of oppisite phase of said adjustable gain subtracter (4) through behind the voltage follower.
6. testing circuit according to claim 5 is characterized in that: said voltage stabilizing reference source is three end adjustable reference sources, and said voltage follower is a dual operational amplifier, and said frequency generator (6) is the waveform generator of a band Dead Time.
7. testing circuit according to claim 6; It is characterized in that: said frequency generator (6) is the waveform generator of TL494 model; The dual operational amplifier of said adjustable gain subtracter (4) is the amplifier of LM358 model; Said voltage stabilizing reference source is three end adjustable reference sources of TL431 model, and the said voltage follower of voltage reference source circuit (7) is the amplifier of LM358 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100699619A CN102590631A (en) | 2012-03-16 | 2012-03-16 | Detection circuit for detecting contact impedance between high-frequency electrotome neutral polar plate and patient |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100699619A CN102590631A (en) | 2012-03-16 | 2012-03-16 | Detection circuit for detecting contact impedance between high-frequency electrotome neutral polar plate and patient |
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| CN102590631A true CN102590631A (en) | 2012-07-18 |
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| CN2012100699619A Pending CN102590631A (en) | 2012-03-16 | 2012-03-16 | Detection circuit for detecting contact impedance between high-frequency electrotome neutral polar plate and patient |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856496A (en) * | 2019-02-25 | 2019-06-07 | 绵阳立德电子股份有限公司 | A kind of neutral electrode monitoring device |
| CN112666397A (en) * | 2020-11-27 | 2021-04-16 | 大连理工大学 | Detection circuit and detection method for contact impedance of negative plate of high-frequency electrotome |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5087257A (en) * | 1989-04-01 | 1992-02-11 | Erbe Elektromedizin Gmbh | Apparatus for monitoring the application of neutral electrodes on a patient undergoing high frequency electro-surgery |
| CN2671512Y (en) * | 2003-12-19 | 2005-01-19 | 上海力申科学仪器有限公司 | High frequency electric knife with double sheet polar adhesive area detecting circuit |
-
2012
- 2012-03-16 CN CN2012100699619A patent/CN102590631A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5087257A (en) * | 1989-04-01 | 1992-02-11 | Erbe Elektromedizin Gmbh | Apparatus for monitoring the application of neutral electrodes on a patient undergoing high frequency electro-surgery |
| CN2671512Y (en) * | 2003-12-19 | 2005-01-19 | 上海力申科学仪器有限公司 | High frequency electric knife with double sheet polar adhesive area detecting circuit |
Non-Patent Citations (1)
| Title |
|---|
| 曾利浪等: "脑电图机电极与头皮接触阻抗的检测", 《上海生物医学工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856496A (en) * | 2019-02-25 | 2019-06-07 | 绵阳立德电子股份有限公司 | A kind of neutral electrode monitoring device |
| CN109856496B (en) * | 2019-02-25 | 2020-12-15 | 绵阳立德电子股份有限公司 | Neutral electrode monitoring device |
| CN112666397A (en) * | 2020-11-27 | 2021-04-16 | 大连理工大学 | Detection circuit and detection method for contact impedance of negative plate of high-frequency electrotome |
| CN112666397B (en) * | 2020-11-27 | 2024-03-19 | 大连理工大学 | High-frequency electrotome negative plate contact impedance detection circuit and detection method |
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