CN109856496B - Neutral electrode monitoring device - Google Patents
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- CN109856496B CN109856496B CN201910136015.3A CN201910136015A CN109856496B CN 109856496 B CN109856496 B CN 109856496B CN 201910136015 A CN201910136015 A CN 201910136015A CN 109856496 B CN109856496 B CN 109856496B
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 45
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- 238000001914 filtration Methods 0.000 claims description 7
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- 230000004907 flux Effects 0.000 description 5
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Abstract
The invention discloses a neutral electrode monitoring device. The monitoring device includes: the device comprises a first coil, a second coil, a third coil, a first capacitor and a second capacitor. The first coil, the second coil and the third coil are coupled with each other; the inductance values of the first coil and the second coil are equal; the first end of the first coil and the first end of the second coil are homonymous ends. The second output end of the high-frequency energy generator is respectively connected with the first end of the first coil and the second end of the second coil. When the high-frequency energy generator is in an output state and the neutral electrode is in good contact, no high-frequency electric signal exists on the third coil. On the contrary, when the neutral electrode connecting cable or the connector thereof is electrically interrupted or the neutral electrode and the patient are in poor contact, the third coil can monitor the high-frequency electric signal. The monitoring device provided by the invention does not need to be additionally provided with a power supply, an excitation signal source and an isolation circuit, and has the advantages of simple structure and low implementation cost.
Description
Technical Field
The invention relates to the field of high-frequency treatment equipment, in particular to a neutral electrode monitoring device.
Background
In the field of medical treatment, high-frequency treatment devices employ a neutral electrode as part of a radio-frequency current loop. When the high-frequency treatment device is used for treating a patient, the neutral electrode is stuck or attached to the body surface of the patient, and if the neutral electrode is not connected or the neutral electrode is not in poor contact, the patient and/or an operator (doctor) can be injured during the process of ablating the focus of the patient by using the high-frequency treatment device. Therefore, monitoring of the neutral electrode is very necessary.
The existing neutral electrode monitoring equipment needs to provide a power supply and an excitation signal source which are not higher than 12V for a monitoring circuit, and two completely different currents appear on a neutral electrode, wherein one current is a high-frequency strong current expected and necessary during treatment, and the other current is a weak excitation current required for monitoring the neutral electrode; and the power supply and the excitation signal must be isolated from the power supply and the ground of the power grid, and a corresponding isolation circuit is required to be added. Therefore, the structure of the existing neutral electrode monitoring circuit is complicated.
Disclosure of Invention
The invention aims to provide a neutral electrode monitoring device which is simple in structure and low in implementation cost.
In order to achieve the purpose, the invention provides the following scheme:
a neutral electrode monitoring device, the monitoring device comprising: a first coil, a second coil, a third coil, a first capacitor and a second capacitor, wherein,
the first coil, the second coil, and the third coil are coupled to each other; the inductance values of the first coil and the second coil are equal; the first end of the first coil and the first end of the second coil are homonymous ends;
a first output end of the high-frequency energy generator is respectively connected with a first end of the first capacitor and a first end of the second capacitor, a second end of the first capacitor is connected with one end of a neutral electrode connector, and a second end of the second capacitor is connected with the other end of the neutral electrode connector;
and a second output end of the high-frequency energy generator is respectively connected with a first end of the first coil and a second end of the second coil, the second end of the first coil is connected with a second end of the first capacitor, and the first end of the second coil is connected with a second end of the second capacitor.
Optionally, the monitoring device further includes a rectifying circuit, and the third coil is connected to the rectifying circuit.
Optionally, the rectifying circuit is a bridge rectifier.
Optionally, the monitoring device further includes a filter circuit, and an input end of the filter circuit is connected to an output end of the rectifier circuit.
Optionally, the monitoring device further includes an indicator light, and the indicator light is connected to the output end of the filter circuit.
Optionally, the monitoring device further includes a buzzer, and the buzzer is connected with the output end of the filter circuit.
Optionally, the first coil, the second coil and the third coil are wound on a magnetic core.
Optionally, the magnetic core is an annular magnetic core.
Optionally, the capacitance values of the first capacitor and the second capacitor are not equal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a neutral electrode monitoring device, which comprises: the device comprises a first coil, a second coil, a third coil, a first capacitor and a second capacitor. The first coil, the second coil and the third coil are coupled to each other. The inductance of the first coil and the second coil is equal. The first end of the first coil and the first end of the second coil are homonymous ends. The second output end of the high-frequency energy generator is respectively connected with the first end of the first coil and the second end of the second coil, the first end of the first coil and the second end of the second coil are synonym ends, the inductance of the first coil and the inductance of the second coil are equal, the high-frequency energy generator is in an output state, and when the neutral electrode is in good contact, the current i flowing through the first coil at any momentL1And a current i flowing through the second coilL2The first coil and the second coil are coupled with each other, the magnetic flux is zero, the high-frequency signal coupled by the third coil is zero, and therefore, no high-frequency electric signal exists on the third coil. On the contrary, if the high frequency energy generator is in the output state but the neutral electrode is not connected or has poor contact, the high frequency current output by the high frequency energy generator flows through the current i of the first coilL1And current i of the second coilL2Are not equal in size and opposite in direction, the first coil and the second coil are coupled with each otherThe resultant magnetic flux is not zero, the third coil can be coupled to a high-frequency signal, and the third coil can monitor a high-frequency electric signal. Therefore, the neutral electrode monitoring device provided by the invention can complete neutral electrode monitoring only through two capacitors and three coils, is a passive monitoring device, does not need to be additionally provided with a power supply, an excitation signal source and an isolation circuit, and has the advantages of simple structure and low implementation cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a circuit diagram of a neutral electrode monitoring apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view of a current direction of a neutral electrode monitoring apparatus according to an embodiment of the present invention at a certain time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a neutral electrode monitoring device which is simple in structure and low in implementation cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a circuit diagram of a neutral electrode monitoring apparatus according to an embodiment of the present invention. As shown in fig. 1, a neutral electrode monitoring apparatus includes: a first coil L1, a second coil L2, a third coil L3, a first capacitor C1 and a second capacitor C2.
The first coil L1, the second coil L2 and the third coil L3 are coupled to each other; the inductance of the first coil L1 and the second coil L2 are equal; the first end (end a) of the first coil L1, the first end (end a) of the second coil, and the first end (end 1) of the third coil L3 are homonymous ends. The second end (K-end) of the first coil L1, the second end (K-end) of the second coil, and the second end (2-end) of the third coil L3 are homonymous ends.
The first output HF of the HF generator is connected to a first terminal of the first capacitor C1 and to a first terminal of the second capacitor C2, respectively, a second terminal of the first capacitor C1 being connected to one terminal of the neutral electrode connector (S-NE1), and a second terminal of the second capacitor being connected to the other terminal of the neutral electrode connector (S-NE 2).
A second output terminal NE of the high-frequency energy generator is respectively connected to the first terminal of the first coil L1 and the second terminal of the second coil L2, the second terminal of the first coil L1 is connected to the second terminal of the first capacitor C1, and the first terminal of the second coil L2 is connected to the second terminal of the second capacitor C2.
Preferably, the monitoring device further comprises a rectifying circuit, and the third coil L3 is connected to an ac input end of the rectifying circuit. In this embodiment, the rectifying circuit is a bridge high-frequency rectifier.
Furthermore, the monitoring device also comprises a filter circuit, and the input end of the filter circuit is connected with the direct current output end of the rectification circuit.
In this embodiment, a full-bridge high-frequency rectifier filter D is used for rectification and filtering, and a direct-current signal at a direct-current output end of D is DC-OUT.
In order to visually display the connection state of the neutral electrode, the monitoring device can also be provided with an indicator light, and the indicator light is connected with the output end of the filter circuit.
Further, in order to enable the neutral electrode connecting cable or the connector thereof to send out an alarm signal when the neutral electrode is electrically interrupted or the neutral electrode is in poor contact with a patient, the monitoring device in the embodiment further comprises a buzzer, and the buzzer is connected with the output end of the filter circuit.
In this embodiment, the first coil L1, the second coil L2, and the third coil L3 are wound around a magnetic core. The magnetic core may optionally be an annular magnetic core.
The first capacitor C1 and the second capacitor C2 are high-frequency capacitors resistant to high voltage, and the capacitance values of the two capacitors are not equal. The impedance values of the first capacitor C1 and the second capacitor C2 at the rated output frequency of the high-frequency energy generator are 50-200 times of the rated load of the equipment.
Fig. 2 is a schematic view of a current direction of a neutral electrode monitoring apparatus according to an embodiment of the present invention at a certain time. As can be seen from fig. 2, iL1Flows from the K terminal to the A terminal of the first coil L1, and iL2From the terminal a of the second coil L2 to the terminal k, since the terminal A of the first coil L1 and the terminal a of the second coil L2 are homonymous terminals, iL1And iL2Are diametrically opposite. FIG. 2 only depicts the instantaneous flow direction of the high-frequency current at a certain moment, in fact at any moment, the current iL1And iL2Are all diametrically opposite.
Specifically, when the high-frequency energy generator is in the output state, the high-frequency currents flowing through the first coil L1 of the inductor and the second coil L2 of the inductor are iL1And iL2Total high frequency current IO＝∣iL1∣+∣iL2| a. At any moment in time, the current iL1And iL2Always in exactly opposite directions. When | iL1∣＝∣iL2-when the net current through the inductor is zero, the magnetic flux in the core of the inductor is zero, the high frequency signal to which the third coil L3 is coupled is zero, and the direct current signal DC-OUT obtained between the two direct current output terminals of the rectifier filter D is zero; when | iL1∣≠∣iL2| with a net current flowing through the inductor, the third coil L3 can be coupled to a high-frequency signal, rectified and filtered by the rectifier filter D, and taken between the two dc outputs of DA non-zero direct current signal DC-OUT.
The following describes the working process under different situations in detail with reference to fig. 1 and fig. 2:
1. when the neutral electrode connector, the connecting cable and the neutral electrode are in good contact with a patient, because the impedance value of the first capacitor C1 and the second capacitor C2 at the rated output frequency of the high-frequency energy generator is 50-200 times of the rated load of the device, the high-frequency current flowing through the first capacitor C1 and the second capacitor C2 is very small, and the shunt amount of the load current can be ignored.
Since the inductances of the first coil L1 and the second coil L2 are equal, the high-frequency current i at the first coil L1L1And a high-frequency current i on the second coil L2L2And the absolute values of the two are almost equal, but the directions are completely opposite, the magnetic fluxes generated by the first coil L1 and the second coil L2 are almost completely cancelled, the magnetic flux in the magnetic core is zero, the high-frequency signal coupled to the third coil L3 is zero, and after rectification and filtering by the rectifier filter D, the direct-current signal DC-OUT between the two direct-current output ends of D is zero.
2. When the connecting cable on the neutral electrode connector S-NE1 is broken, iL1≈0，iL2≈IOHigh frequency current I generated by a high frequency energy generatorOAlmost all the current flows through the second coil L2, the third coil L3 is coupled to a high-frequency signal consistent with the rated frequency, and after rectification and filtering by the rectifier filter D, a direct-current signal DC-OUT different from zero is obtained between two direct-current output ends of D.
3. When the connecting cable on the neutral electrode connector S-NE2 is broken, iL2≈0，iL1≈IOHigh frequency current IOAlmost completely flows through the first coil L1, the third coil L3 is coupled to a high-frequency signal corresponding to the rated frequency, and after rectification and filtering by the rectifier filter D, a direct-current signal DC-OUT different from zero is obtained between the two direct-current output ends of D.
4. When the connection cables on the neutral electrode connectors S-NE1 and S-NE2 are simultaneously interrupted, no high-frequency current flows through the load (human tissue), and the first capacitor C1 and the second capacitor C2 constitute an output channel of the high-frequency current. Due to the first capacitance C1 and the capacitance value of the second capacitor C2 are not equal, and the high-frequency current i on the first coil L1L1And a high-frequency current i on the second coil L2L2The absolute value of the third coil L3 is not zero, the third coil L3 is coupled to a high-frequency signal consistent with the rated frequency, and after rectification and filtering by the rectifier filter D, a direct-current signal DC-OUT of not zero is obtained between the two direct-current output ends of D.
5. When the neutral electrode is in poor contact with the patient, the high-frequency current flowing through the capacitors C1 and C2 changes, and the high-frequency current i on the first coil L1L1And a high-frequency current i on the second coil L2L2The absolute value of the third coil L3 is not equal to zero, the third coil L3 is coupled to a high-frequency signal consistent with the rated frequency, and after rectification and filtering by the rectifier filter D, a non-zero direct current signal DC-OUT is obtained between the two direct current output ends of D.
According to the passive neutral electrode monitoring device provided by the invention, when the neutral electrode connecting cable or the connector thereof is electrically interrupted or the neutral electrode and a patient are in poor contact, a high-frequency electric signal can be monitored on the third coil. When the high-frequency energy generator is in an output state, the neutral electrode connector, the connecting cable and the neutral electrode are in good contact with a patient, and no high-frequency electric signal exists on the third coil. The monitoring device does not need to be additionally provided with a power supply, an excitation signal source and an isolation circuit, and has simple structure and low implementation cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A neutral electrode monitoring apparatus, the monitoring apparatus comprising: a first coil, a second coil, a third coil, a first capacitor and a second capacitor, wherein,
the first coil, the second coil, and the third coil are coupled to each other; the inductance values of the first coil and the second coil are equal; the first end of the first coil and the first end of the second coil are homonymous ends;
a first output end of the high-frequency energy generator is respectively connected with a first end of the first capacitor and a first end of the second capacitor, a second end of the first capacitor is connected with one end of a neutral electrode connector, and a second end of the second capacitor is connected with the other end of the neutral electrode connector;
and a second output end of the high-frequency energy generator is respectively connected with a first end of the first coil and a second end of the second coil, the second end of the first coil is connected with a second end of the first capacitor, and the first end of the second coil is connected with a second end of the second capacitor.
2. The monitoring device of claim 1, further comprising a rectifying circuit, the third coil being connected to the rectifying circuit.
3. The monitoring device of claim 2, wherein the rectifying circuit is a bridge rectifier.
4. The monitoring device of claim 2, further comprising a filter circuit, an input of the filter circuit being connected to an output of the rectifier circuit.
5. The monitoring device of claim 4, further comprising an indicator light coupled to an output of the filter circuit.
6. The monitoring device of claim 4, further comprising a buzzer connected to an output of the filtering circuit.
7. The monitoring device of claim 1, wherein the first coil, the second coil, and the third coil are wound around a magnetic core.
8. The monitoring device of claim 7, wherein the magnetic core is a toroidal core.
9. The monitoring device of claim 1, wherein the capacitance values of the first and second capacitances are not equal.
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