DE1149832C2 - HIGH FREQUENCY SURGICAL EQUIPMENT - Google Patents

HIGH FREQUENCY SURGICAL EQUIPMENT

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Publication number
DE1149832C2
DE1149832C2 DE1961S0072719 DES0072719A DE1149832C2 DE 1149832 C2 DE1149832 C2 DE 1149832C2 DE 1961S0072719 DE1961S0072719 DE 1961S0072719 DE S0072719 A DES0072719 A DE S0072719A DE 1149832 C2 DE1149832 C2 DE 1149832C2
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DE
Germany
Prior art keywords
frequency
housing
electrode
frequency generator
generator
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Expired
Application number
DE1961S0072719
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German (de)
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DE1149832B (en
Inventor
Walter Dipl-Ing 8520 Erlangen Krause
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Siemens AG
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Siemens AG
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Priority to DE1961S0072719 priority Critical patent/DE1149832C2/en
Priority to CH164962A priority patent/CH418519A/en
Publication of DE1149832B publication Critical patent/DE1149832B/en
Application granted granted Critical
Publication of DE1149832C2 publication Critical patent/DE1149832C2/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/0066—Sensing and controlling the application of energy without feedback, i.e. open loop control

Description

J5J5

Die Erfindung bezieht sich auf einen Hochfrequenz-Chirurgieapparat mit Anschlüssen für mind-estens eine aktive Elektrode (Operationselektrode) und eine neutrale Elektrode.The invention relates to high frequency surgical apparatus with connections for at least one active electrode (surgical electrode) and a neutral one Electrode.

Bei Operationen mit solchen Hochfrequenz-Chirurgieapparaten treten mitunter Verbrennungen an verschiedenen, nicht im.Operationsfeld liegenden und auch von der neutralen Elektrode freien Körperstellen des Patienten auf, ohne daß es bislang möglich gewesen ist, die Ursache dieser Schädigungen zu klären. Der Erfindung liegen umfangreiche Überlegungen und Meßreihen zugrunde, die zur Kenntnis der Ursache für die genannten Verbrennungen geführt haben. Die Anwendung der Merkmale der Erfindung bei Hochfrequenz-Chirurgieapparaten der eingangs erwähnten Art gewährleistet, daß die geschilderten unbeabsichtigten, u. U. lebensgefährlichen Verbrennungen ausgeschlossen und dadurch der Einsatz von Hochfrequenz-Chirurgieapparaten unbedenklicher wird.During operations with such high-frequency surgical devices, burns can occur on various Body parts of the body not lying in the operating field and also free from the neutral electrode Patients on, without it has been possible to clarify the cause of this damage. Of the Invention are based on extensive considerations and series of measurements, the knowledge of the cause for caused the burns mentioned. Application of the features of the invention to high frequency surgical apparatus of the type mentioned at the beginning ensures that the unintentional, possibly life-threatening burns and thus the use of high-frequency surgical devices becomes safer.

Ein Hochfrequenz-Chirurgieapparat der eingangs genannten Art ist z. B. aus der US-Patentschrift 45 215 bekannt. Diese US-Patentschrift 16 45 215 befaßt sich insbesondere mit der Frage, wie eine ausreichende Konstanz der Hochfrequenzschwingungen erreicht und niederfrequentere Störschwingungen unierdrückt werden können. Solche niederfrequenten Störschwingungen führen nämlich 7,u unerwünschten Reizungen des Patienten, die es manchmal unmöglich machen, eine Operation durchzuführen. Zur Lösung des Problems schlägt die Patentschrift vor, zwischen den Hochfrequenz-Generator und die aktive sowie inaktive Behandlungselektrode einen abgestimmten Schwingkreis einzuschalten und diesem Schwingkreis noch MU el zur Unterdrückung der von der Betnebsfrequenz abweichenden niederfrequenteren Schwingung zu*u-A high-frequency surgical apparatus of the type mentioned is z. B. from US Pat. No. 45,215. This US patent 16 45 215 deals in particular with the question of how a sufficient constancy of the high-frequency vibrations can be achieved and lower-frequency interference vibrations can be suppressed. Such low-frequency interfering vibrations cause 7, u undesirable irritation of the patient, which sometimes makes it impossible to perform an operation. To solve the problem, the patent suggests connecting a tuned oscillating circuit between the high-frequency generator and the active and inactive treatment electrode and adding MU el to this oscillating circuit to suppress the lower-frequency oscillation that deviates from the operating frequency * u-

OrMhn'einer völlig anderen Aufgabe, nämlich bei Oiaihermiegeräten zur Rundfunk-Entstörung das Eindringen von Störungen in die Netzleuung zu vermin- α hofaßt sich das Vorschriftenbuch des VDE in seTner22 Ablage von ,939 au» den Seiten .23, bis ,234. Dort wird zur Verminderung des Eindringens von Störungen in die Netzleitungen bzw. zur Verminderung der Ausstrahlung u.a. vorgeschlagen, Drosseln und Kondensatoren (Drosselglieder) nahe am Diathermie- «rät in die Netzleitungen und gegebenenfalls in den dazugehörigen Schutzleiter des Gehäuses e.nzuschal-,en Dabei soll der mit dem D.aiherm.egerat zu Behandelnde nicht in galvanische oder kapazitive Verbindung mit der Abschirmung, d.h. mn einer Erdleitung, kommen. Or Mh n 'a completely different task, namely Oiaihermiegeräten for radio interference suppression the penetration of noise into the Netzleuung to vermin- α the rules book hofaßt to the VDE in seTner22 depositing, 939 au »pages .23 until, 234th There it is proposed to reduce the penetration of disturbances into the power lines or to reduce the radiation, among other things, to connect chokes and capacitors (choke elements) close to the diathermy device in the power lines and, if necessary, in the associated protective conductor of the housing the device to be treated with the D.aiherm. device should not come into galvanic or capacitive connection with the shielding, i.e. with an earth line.

Gemäß VDE-Vorschriften ist die neutrale Elektrode eines Hochfrequenzchirurgieapparates sowie das Gehäuse des Hochfrequenz-Generators niederfrequenzmäßip zu erden. Da i. a. die neutrale Elektrode galvanisch an das Gehäuse des Hochfrequenzgenerafors angeschlossen wird, ist es möglich, die Erdle.tung für die Arbeitsfrequenz des Chirurgieapparates hochohmig zu machen. Dabei wird allerdings die Gefahr m Kauf genommen, daß bei Berühren des Gehäuses durch eine nVt Frdpotential verbundene Person (z. B. Bedienungspersonal) Hochfrequenzspannungsüberschläge gebildet und diese Personen belästigt oder gar selährdet werden.According to VDE regulations, the neutral electrode is of a high-frequency surgical apparatus and the housing of the high-frequency generator low frequency module to ground. Since i. a. the neutral electrode galvanically to the housing of the high-frequency generator is connected, it is possible to set the earth line for the operating frequency of the surgical apparatus to be high-resistance close. In this case, however, the risk is taken that when the housing is touched by m purchase a person connected to nVt external potential (e.g. operating personnel) High-frequency voltage flashovers are formed and these people are harassed or even endangered.

Die technische Aufgabe der vorliegenden Erfindung besteht also darin, einen Hochfrequenz-Chirurgieapparat mit Mitteln zu versehen, die Verbrennungserscheinungen an Patienten verhindern, welche aui die Erregung von im Bereich der Arbeitsfrequenz liegende;) Resonanzschwingungen desjenigen Schwingungskreises zurückzuführen sind, der aus der neutralen Elektrode mit ihren Zuleitungen, dem Patienten, der Kapazität zwischen Patient und Erdboden, dem Erdboden der Installationsinduktivität des Apparategehäuses und dem Apparategehäuse selbst gebildet istThe technical object of the present invention is therefore to provide a high-frequency surgical apparatus to provide with means that prevent burns in patients who are also the Excitation of resonance oscillations of that oscillation circuit lying in the range of the working frequency are attributable to the neutral electrode with its leads, the patient, the Capacitance between the patient and the ground, the ground of the installation inductance of the apparatus housing and the apparatus housing itself is formed

Diese Aufgabe wird erfindungsgemäß dadurch gelost, daß der Hochfrequenz-Generator und demzufolge auch die Anschlußklemmen für die aktive und die neutrale Elektrode von dem den Hochfrequenz-Generator enthaltenden metallischen Gehäuse hochfrequenzmäßig elektrisch getrennt sind und daß mindestens einer der beiden Ausgänge des Hochfrequenz-Generators, vorzugsweise der die Anschlußklemme für die neutrale Elektrode enthaltende Ausgang, mit dem genannten Gehäuse über eine Induktionsspule verbunden ist, die derart bemessen ist, daß ihre Induktivität die zwischen dem genannten Gehäuse und dem betreffenden Ausgang des Hochfrequenz-Generators vorhandene Kapazität - die in der Größenordnung von etwa 5 bis 50 pF liegt - zu einem Parailelschwingkreis ergänzt, der zumindest angenähert auf die Arbeitsfrequenz des Apparates abgestimmt ist (Sperrkreis zwischen dem genannten Gehäuse und dem betreffenden Ausgang des Hochfrequenz-Generators).According to the invention, this object is achieved in that the high-frequency generator and consequently also the connection terminals for the active and the neutral electrode of the high-frequency generator containing metallic housing are electrically isolated in terms of high frequency and that at least one of the both outputs of the high-frequency generator, preferably the terminal for the neutral Electrode containing output, is connected to said housing via an induction coil which is dimensioned such that its inductance between said housing and the relevant Output of the high-frequency generator existing capacity - which is of the order of about 5 to 50 pF is - added to a parallel oscillating circuit, which is at least approximately matched to the operating frequency of the apparatus (blocking circuit between the mentioned housing and the relevant output of the high-frequency generator).

Beim Hochfrequenz-Chirurgieapparat nach der hrfindung werden die erwähnten Verbrennungen dadurch vermieden, daß infolge der gebildeten Schwingungskreise der Verbindungsweg über die Teile und den Patienten für die Arbeitsfrequenz des Gerätes hochohmig gemacht wird. Durch die Erfindung werden mitWith the high-frequency surgical apparatus after finding the hearing the mentioned burns are avoided by the fact that as a result of the oscillation circles formed, the connection path over the parts and the The patient is made high-impedance for the operating frequency of the device. With the invention

einfachen Mitteln unbeabsichtigte, u. U. lebensgefährliche Verbrennungen ausgeschlossen. Dabei isi ei vorteilhaft, den Schwingungskreis so zu dimensionieren, daß die Resonanzfrequenz des Schwingungskreises etwas unterhalb der Arbeitsfrequepz des Chirurgieapparates liegt.unintentional, possibly life-threatening burns are excluded with simple means. There is one advantageous to dimension the resonant circuit so that the resonance frequency of the resonant circuit is slightly below the operating frequency of the surgical apparatus.

Das Losungsprir.zip der Erfindung liegt also darin, den Hochfrequenz-Generator mit seinen Ausgängen auf ein hochfrequenzmäßig schwebendes Potential zu legen und in dem oben beschriebenen Schwingungskreis ein Schaltelement zwischen Generator und Gehäuse vorzusehen, das für die Resonanzfrequenz dieses Kreises hoehohmig ist, so daß es nicht zur Erregung der Resonanzschwingungen kommen kann. Dadurch werden sowohl die Patienten wirkungsvoll vor Verbrennungen geschützt als auch andere Personen vor Belästigungen bei Berühren des Gehäuses des Hochfrequenz-Chirurgieapparates bewahrt.The solution principle of the invention lies in the high-frequency generator with its outputs towards a high-frequency floating potential place and in the oscillation circuit described above, a switching element between the generator and the housing to provide that is hoehohmig for the resonance frequency of this circuit, so that it does not excite the Resonance vibrations can occur. This will both protect the patient effectively from burns protected as well as other people from nuisance when touching the housing of the high-frequency surgical apparatus preserved.

In diesem Zusammenhang wird auf das aus der DT-PS 9 70 318 bekannte Diathermiegerät zur Behandlung im Kondensatorfeld hingewiesen. Bei diesem Gerät wird davon ausgegangen daß die ungleichmäßig kapazitive Ankopplung der Hochfrequenzenergie über eine Luftstrecke an den Patienten mittels der beiden Kondensatorelektroden zu unsymmetrischer Kapazitätsverteilung im Patientenkreis, Spannungsverschiebungen auf den Patientenzuleitungen und zu beträchtlichen Gehäusespannungen führt. Bei der Hochfrequenz-Chirurgie liegen die aktive und die neutrale Elektrode jedoch direkt am Patienten. Sie bilden also wegen der galvanischen Verbindung mit dem Körper keine nennenswerte Kapazität. Deshalb fehlt die Voraussetzung dafür, die im Zusammenhang mit der unsymmetrischen kapazitiven Ankopplung bei Diathermiegeräten in der Patentschrift empfohlene Maßnahme auch bei Hochfrequenz-Chirurgieapparaten a's sinnvoll für die Vermeidung von ungewünschten Verbrennungen bei Hochfrequenz-Chirurgieapparaten anzusehen. Durch das bekannte Diathermiegerät kann also die die Lösungsidee und Bemessungsvorschrift umfassende Lehre der vorliegenden weiteren Erfindung nicht nahegelegt werden.In this context, the diathermy device known from DT-PS 9 70 318 for treatment in the Capacitor field pointed out. This device assumes that the unevenly capacitive Coupling of the high-frequency energy via an air gap to the patient by means of the two Capacitor electrodes for asymmetrical capacity distribution in the patient circuit, voltage shifts on the patient supply lines and leads to considerable tension in the case. In high frequency surgery however, the active and neutral electrodes lie directly on the patient. So you educate because of the galvanic connection with the body no appreciable capacity. Therefore the requirement is missing for that in connection with the asymmetrical capacitive coupling in diathermy devices The measure recommended in the patent specification also makes sense for high-frequency surgical apparatus Avoid unwanted burns when using high frequency surgical equipment. By the well-known diathermy device can therefore encompass the solution idea and design specification Teaching of the present further invention should not be suggested.

Weitere Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Figurenbeschreibung:Further details of the invention emerge from the following description of the figures:

In der Figur ist ein Ausführungsbeispiel der Erfindung als Ersatzschaltbild dargestellt: Dabei stellt 1 das Gehäuse des Chirurgieapparates mit dem Hochfrequenz-Generator 2 und 3 den (schematisch angedeuteten) Patienten dar. 2[wischen dem Chirurgieapparat 1 und dem Patienten 3 bestehen drei verschiedene elektrische Verbindungswege. Der erste Verbindungsweg setzt sich aus der an den aktiven Pol 4 des Generators angeschlossenen Zuleitung 5 mit der Zuleitungsinduktivität 6 und der aktiven Chirurgieelektrode 7 zusammen. Der zweite Verbindungsweg wird aus der an den inaktiven Pol 8 des Hochfrequenz-Generators bzw. die Masse des Gerätes angeschlossenen Verbindungsleitung 9 mit der Zuleitungsinduktivität 10 sowie der neutralen Elektrode 11 gebildet. Der dritte Verbindungsweg schließlich besteht aus der Kapazität 12, die sich aus allen Einzelkapazitäten zwischen dem Patienten, dem Operationstisch und dem übrigen Operationsraum zusammensetzt, der Erde 13 und der Induktivität 14. Let2!tere ist in der Praxis durch die Selbstinduktionen der einzelnen Leitungen im Netzansciilußkabel gegeben. Diese Selbstinduktionen sind netzseitig über die Installationskapazitäten mit der Erde und an ihren geräteseitigen Enden über die inneren Kapazitäten der Netzanschlußbauteile, beispielsweise über die Wicklungskapazitäten des Netztransformators, hochfrequenzmäßig einander parallel geschaltet, so daß sie als gemeinsame Induktivität 14 wirksam sind. Die in F i g. 1 noch eingezeichnete Kapazität 15 bezeichnet die Kapazität des Apparategehäuses 1 gegen Erde und kann zunächst außer Betracht bleiben.In the figure, an exemplary embodiment of the invention is shown as an equivalent circuit diagram: 1 represents the Housing of the surgical apparatus with the high-frequency generator 2 and 3 (indicated schematically) Patients. 2 [between the surgical apparatus 1 and the patient 3 there are three different ones electrical connection paths. The first connection path consists of the one to the active pole 4 of the Generator connected supply line 5 with the supply line inductance 6 and the active surgical electrode 7 together. The second connection path is made up of that to the inactive pole 8 of the high-frequency generator or the connection line 9 connected to the ground of the device with the feed line inductance 10 and the neutral electrode 11 are formed. Finally, the third connection path consists of capacity 12, resulting from all the individual capacities between the patient, the operating table and the rest Operating room composed of earth 13 and inductance 14. Let2! Tere is in practice by the Given self-induction of the individual lines in the power supply cable. These are self-inductions on the network side via the installation capacities with the earth and at their device-side ends via the inner ones Capacities of the network connection components, for example via the winding capacities of the network transformer, In terms of high frequency, they are connected in parallel with one another, so that they act as a common inductance 14. In the F i g. 1 capacitance 15 still drawn in denotes the capacitance of the apparatus housing 1 to earth and can initially be disregarded.

Die Ursache für die unerwünschten Verbrennungen liegt im letztgenannten Verbindungsweg, und zwar besteht folgender Zusammenhang: Die Teile 9, 10 und 11 des zweiten Verbindungsweges sowie der Patient 3 bilden zusammen mit den Teilen 12, 13 und 14 des dritten Verbindungsweges einen geschlossenen Schwingkreis, der nach Maßgabe der elektrischen Werte der einzelnen genannten Teile eine bestimmte Eigenfrequenz besitzt. Bei bestimmten räumlichen Anordnungen der einzelnen Teile dieses Kreises zueinander und gegenüber der Netzerde tritt der Fall ein, daß die Eigenfrequenz dieses Schwingkreises im Bereich der Arbeitsfrequenz des Generators liegt. In einem solchen Fall wird während des Operationsvorganges durch die dem genannten Schwingkreis und dem eigentlichen Arbeitskreis 5, 6, 7 gemeinsame Induktivität (O der Zuleitung 9 zur neutralen Elektrode 11 in den Schwingkreis9,10,11,12,13 und 14 mildem Patienten 3 Hochfrequenzenergie eingekoppelt. Dabei entstehen in diesem Schwingkreis Spannungen und Blindströme, die beträchtliche Werte annehmen können und mitunter wesentlich höher sind als die Spannungen und Ströme, die vom Generator 2 geliefert werden. Damit ist aber die Gefahr von unbeabsichtigten Verbrennungen an praktisch beliebigen Körperstellen des Patienten, zumeist aber an vorstehenden Körperteilen, wie etwa Hüftknochen und Steißbein, gegeben.The cause of the undesired burns lies in the latter connection path, namely there is the following relationship: Parts 9, 10 and 11 of the second connection path and patient 3 together with the parts 12, 13 and 14 of the third connection path form a closed one Oscillating circuit, which is a certain according to the electrical values of the individual parts mentioned Owns natural frequency. With certain spatial arrangements of the individual parts of this circle to each other and to the network earth the case occurs that the natural frequency of this resonant circuit in the The operating frequency of the generator. In such a case, during the surgical procedure due to the inductance common to the said resonant circuit and the actual working circuit 5, 6, 7 (O of the lead 9 to the neutral electrode 11 in the Oscillating circuit 9, 10, 11, 12, 13 and 14 mild patient 3 Coupled in high frequency energy. This creates voltages and reactive currents in this resonant circuit can assume considerable values and are sometimes significantly higher than the voltages and currents, which are supplied by generator 2. But this increases the risk of unintentional burns practically any part of the patient's body, but mostly on protruding parts of the body, such as Hipbones and coccyx, given.

In der Figur sind die Selbstinduktivitäten der Netzleitungen als resultierende Induktivität 14 dargestellt. Durch Schaltung der Selbstinduktionsspule 54 zwischen Hochfrequenz-Generator 2 und Gehäuse 3 wird nun zusammen mit der Kapazität 55 des der Buchse 8 zugeordneten Ausgangs des Hochfrequenz-Generators gegen das Gerätegehäuse ein Parallelschwingkreis gebildet, der zumindest angenähert auf die Arbeitsfrequenz des Chirurgieapparates abgestimmt ist. Es kann mitunter zweckmäßig sein, auch die Kapazität 56 des der Anschlußbuchse 4 zugeordneten Ausganges zu kompensieren. Dies erfolgt auf an iloge Weise, wie bei dem der Buchse 8 zugeordneten Ausgang mit der Induktionsspule 57.In the figure, the self-inductances of the power lines are shown as the resulting inductance 14. By switching the self-induction coil 54 between the high-frequency generator 2 and the housing 3 is now together with the capacitance 55 of the socket 8 associated output of the high-frequency generator formed against the device housing a parallel resonant circuit, which is at least approximately based on the Working frequency of the surgical apparatus is coordinated. It can be useful at times, including the capacity 56 of the output assigned to the connection socket 4 to compensate. This is done in an ilogical manner, like at the output associated with the socket 8 with the induction coil 57.

Durch Schaltung der auf die Arbeitsfrequenz des Hochfrequenz-Chirurgieapparates abgestimmten Parallelschwingkreise 54, 55 bzw. 56, 57 zwischen dem Hochfrequenz-Generator 2 und dem Gehäuse 1 wird der vorgehend erläuterte Schwingkreis 9 bis 14 für diese Arbeitsfrequenz hoehohmig gemacht. Verbrennungen des Patienten sind dadurch praktisch ausgeschlossen.By switching the parallel resonant circuits tuned to the operating frequency of the high-frequency surgical apparatus 54, 55 or 56, 57 between the high-frequency generator 2 and the housing 1 is the previously explained oscillating circuit 9 to 14 for this Working frequency made high. Burns to the patient are practically impossible.

Weitere Vorteile der Erfindung "liegen im geringen Aufwand, da die Spulen in ihren Abmessungen sehr klein gewählt werden können, da keine Netzleistung durch sie flieDt. Die Erfindung kann bei Chirurgiegeräten eingesetzt werden, bei denen die Stromversorgungseinrichtung im Gerät eingebaut ist (z. B. in Form einer Akkumulatorenbatterie) und bei denen der hochfrequente Verbindungsweg des Generators über die Kapazität 15 zur Erde besonders hoehohmig gemacht werden soll.Further advantages of the invention "are the low cost, since the coils are very large in their dimensions can be chosen to be small, since no network power flows through them. The invention can be used in surgical devices in which the power supply is built into the device (e.g. in the form of a Accumulator battery) and where the high-frequency connection path of the generator via the Capacity 15 to earth is to be made particularly high-resistance.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (2)

Patentansprüche:Patent claims: 1. Hochfrequenz-Chirurgieapparat mit Anschlüssen für mindestens eine aktive Elektrode (Operationselektrode) und eine neutrale Elektrode, d a durch gekennzeichnet, daß der Hochfrequenzgenerator (2) und demzufolge auch die Anschlußklemmen (4, 8) für die aktive Elektrode (7) und die neutrale Elektrode (H) von dem den Hochfrequenz-Generator einhaltenden metallischen Gehäuse (1) hochfrequenzmäßig elektrisch getrennt sind und daß mindestens einer der beiden Ausgänge des Hochfrequenz-Generators (2), vorzugsweise der die Anschlußklemmen (8) für die neutrale Elektrode (11) enthaltende Ausgang, mit dem genannten Gehäuse (1) über eine Induktionsspule (54 bzw. 57) verbunden ist, die derart bemessen ist, daß ihre Induktivität die zwischen dem genannten Gehäuse (1) und dem betreffenden Ausgang des Hochfrequenz-Generators (2) vorhandene Kapazität (55 bzw. 56) — die in der Größenordnung von eiwa 5 bis 5OpF liegt — zu einem Parallelschwingkreis ergänzt, der zumindest angenähert auf die Arbeitsfrequenz des Apparates abgestimmt ist [Sperrkreis zwischen dem genannten Gehäuse (1) und dem betreffenden Ausgang des Hochfrequenz-Generators (2)].1.High-frequency surgical apparatus with connections for at least one active electrode (surgical electrode) and a neutral electrode, d a characterized in that the high frequency generator (2) and consequently also the terminals (4, 8) for the active electrode (7) and the neutral electrode (H) of the den Metallic housing (1) which complies with the high frequency generator in terms of high frequency electrical are separated and that at least one of the two outputs of the high-frequency generator (2), preferably the output containing the terminals (8) for the neutral electrode (11), with the said housing (1) is connected via an induction coil (54 or 57), which are dimensioned in this way is that its inductance is that between said housing (1) and the relevant Output of the high-frequency generator (2) existing capacity (55 or 56) - the one in the The order of magnitude is around 5 to 5OpF - added to a parallel resonant circuit that at least is approximately matched to the operating frequency of the apparatus [blocking circuit between the said Housing (1) and the relevant output of the high-frequency generator (2)]. 2. Hochfrequenz-Chirurgieapparat nach Anspruch 1, dadurch gekennzeichnet, daß die P.esonanzfrequenz des Schwingkreises (54, 55 bzw. 56, 57) etwas unterhalb der Arbeitsfrequenz des Apparates liegt.2. High-frequency surgical apparatus according to claim 1, characterized in that the resonance frequency of the oscillating circuit (54, 55 or 56, 57) is slightly below the operating frequency of the apparatus.
DE1961S0072719 1961-02-25 1961-02-25 HIGH FREQUENCY SURGICAL EQUIPMENT Expired DE1149832C2 (en)

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DE1961S0072719 DE1149832C2 (en) 1961-02-25 1961-02-25 HIGH FREQUENCY SURGICAL EQUIPMENT
CH164962A CH418519A (en) 1961-02-25 1962-02-10 High frequency surgical apparatus

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