DE3423356C2 - Elektrochirurgisches Hochfrequenz-Schneidinstrument - Google Patents
Elektrochirurgisches Hochfrequenz-SchneidinstrumentInfo
- Publication number
- DE3423356C2 DE3423356C2 DE3423356A DE3423356A DE3423356C2 DE 3423356 C2 DE3423356 C2 DE 3423356C2 DE 3423356 A DE3423356 A DE 3423356A DE 3423356 A DE3423356 A DE 3423356A DE 3423356 C2 DE3423356 C2 DE 3423356C2
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- cutting
- electrode
- instrument according
- neutral
- cutting instrument
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- 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
- A61B18/14—Probes or electrodes 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
- A61B18/14—Probes or electrodes therefor
- A61B18/1402—Probes for open surgery
-
- 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
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
-
- 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
- A61B2018/0091—Handpieces of the surgical instrument or device
- A61B2018/00916—Handpieces of the surgical instrument or device with means for switching or controlling the main function of the instrument or device
- A61B2018/00928—Handpieces of the surgical instrument or device with means for switching or controlling the main function of the instrument or device by sending a signal to an external energy source
-
- 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
- A61B2018/1246—Generators therefor characterised by the output polarity
- A61B2018/126—Generators therefor characterised by the output polarity bipolar
-
- 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
- A61B18/14—Probes or electrodes therefor
- A61B18/16—Indifferent or passive electrodes for grounding
- A61B2018/162—Indifferent or passive electrodes for grounding located on the probe body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/06—Measuring instruments not otherwise provided for
- A61B2090/062—Measuring instruments not otherwise provided for penetration depth
Abstract
Bei einem elektrochirurgischen Hochfrequenz-Schneidinstrument ist die Neutralelektrode (11) beidseits der Schneidelektrode (12), jedoch gegenüber der Schneidelektrode (12) zurückversetzt am Instrumentenkörper (13) gelagert. Das Verhältnis der Größen der Kontaktflächen (14, 15) der Neutralelektrode (11) und der Schneidelektrode (12) ist größer als 7 : 1 und kleiner als 20 : 1 (Fig. 1).
Description
Die Erfindung betrifft ein elektrochirurgisches Hochfrequenz-Schneidinstrument
nach dem Oberbegriff des Patentanspruchs 1.
Bei einem bekannten elektrochirurgischen Hochfrcquenz-Schneidinstrument
dieser Art (DE-OS 25 21 719) befindet sich die Neutralelektrode zwar in unmittelbarer
Nähe der Schneidelektrode, doch ist sie vom Geweso be durch eine Kunststoffabdeckung bzw. Anordnung in
einem Endoskop so vom Gewebe getrennt, daß sie lediglich über das bei einem Schneidvorgang vorliegende
Sekret elektrolytisch mit der Schneidelektrode in elektrische Verbindung treten kann.
Hierdurch ist es schwierig, die zum einwandfreien Schneiden erforderliche Stromstärke in der erforderlichen
möglichst genau definierten Weise an der Schneidelektrode aufrecht zu erhalten. So kann es entweder bei
zu hoher Leistungseinstellung am Hochfrequen/.gcncrator zu Verbrennungen oder bei zu geringer Leistungseinstellung zu einem schlechten Schnitt oder sog.ir zu
Verletzungen kommen, weil das zu schneidende Gewebe aufgrund von Koagulationsvorgängen mit der
Schneidelektrode verklebt.
Weiter ist bereits ein elektrochirurgisches Instrument zum Schneiden oder Koagulieren von Gewebe bekannt
(DE-OS 29 26 630), bei dem eine bipolare Messcninorclnung
einen Isolierteil, eine Mittelelektrode und geteilte
Außenelektroden aufweist. Die äußeren Elektroden dienen
dabei als Messerelektroden.
Die Aufgabe der Erfindung besteht darin, ein elektrochirurgisches
Hochfrequenz-Schneidinstrument der eingangs genannten Gattung zu schaffen, an dessen
Schneidelektrode während der Durchführung eines Schnittes im wesentlichen senkrecht zur Längsachse des
Instrumcntenkörpers weitgehend genau definierte
Stromverhältnisse vorliegen, welche einerseits einen einwandfreien sauberen Schnitt des Gewebes gewährleisten,
ohne daß es andererseits zu Gewebeüberhitzungen oder zu Verklebungen zwischen dem Gewebe und
dem Instrument kommt.
Die Lösung dieser Aufgabe wird bei dem eingangs definierten Schneidinstrument erfindungsgeinäß durch
die im kennzeichnenden Tei! des Patentanspruchs 1 angegebenen Merkmale gelöst.
Wird bei einem derartigen Schneidinstrument z. B. eine Leistung von 5 bis 10 Watt pro mm2 an die Schneidelektrode
angelegt, so entsteht an der vorzugsweise als Spitze ausgebildeten Schneidelektrode eine derartige
Leistungsdichte, daß die zur Gewebetrennun? notwendige Hitze im Gewebe und in den Gewebezellen erzeugt
wird. Dadurch, daß die Neutralelektrode selbst ebenfalls mit dem Gewebe in stromleitendem Kontakt
steht, ist ein einwandfreier Stromfluß zwischen Schneidelektrode und Neutralelektrode gewährleistet. Mit anderen
Worten ist der Übergangswiderstand zwischen den beiden Elektroden weitgehend konstant. Aufgrund
der größeren Fläche der mit dem Gewebe in Kontakt befindlichen Neutralelektrode ist dort die Leistungsdichte
dagegen so stark herabgesetzt, daß es bei den üblichen Schnittgeschwindigkeiten in der Größenordnung
von einigen cm pro see nicht einmal zu einer solchen
Gewebeerwärmung kommt, die zu einer Koagulation führen könnte. Die Neutralelektrode gleitet somit
beim Schneiden glatt über das Gewebe hinweg, während die unmittelbar daneben bzw. dazwischen angeordnete
Schneidelektrode genau an der gewünschten Schnittstelle die erforderliche starke Erhitzung herbeiführt,
wie sie zur Führung eines glatten Schnittes erforderlich ist. Da der Widerstand zwischen der Schneidelektrode
und der Neutralelektrode weitgehend konstant ist. kann die Hochfrequenzleistung des Generators
auf einen solchen Wert eingestellt werden, daß auch im Bereich der Schneidelektrode eine Überhitzung des Gewebes
wirksam vermieden wird, jedoch ein sauberer Schnitt vorliegt.
Da die Schneidelektrode mit einer scharfen Spitze ausgebildet ist, ist die Leistungsdichte im Spitzenbereich
besonders groß, was für einen glatten, verletzungsfreien Schnitt von besonderer Bedeutung ist.
D;is erfindungsgemäße Hochfrequenz-Schneidinstrumcnl
ist unkritisch in der Bedienung durch den Chirurgen, weil auch bei unregelmäßiger Schnittgeschwindigkeil
noch ein einwandfreier Elektroschnitt durch die Schneidelektrode durchgeführt wird, ohne daß es im
Bereich der Neutralelektrode zu Gewebeschädigungen oder Verkleidungen kommt.
Diimit das erfindungsgemäße Schneidinstrument
nicht zu unhandlich wird, soll weiter vorgesehen sein, daß die Gewebekontaktfläche der Neutralelektrode
kleiner als das 20fache und vorzugsweise kleiner als das 15fache der Gewebekontaktfläche der Schneidelektrode
beträgt.
Besonders gute elektrochirurgische Schneideigenschaften verbunden mit finem kompakten und schlanken
Aufbau des Instrumentenkörpers erhält man, wenn die Gewebekontaktfläche der Neutralelektrode etwa
das lOfache der Gewebekontaktfläche der Schneidelektrode
betrügt.
Obwohl die Schneidelektrode grundsätzlich auch die Form einer engen Schlinge haben könnte, ist es doch
bevorzugt, wenn die Schneidelektrode im wesentlichen axial und vorzugsweise auch geradlinig von der Spitze
des Instrumentenkörpers vorsteht. Ist die Schneidelektrode darüber hinaus mit einer scharfen Spitze ausgebildet,
so wird hierdurch die Leistungsdichte im Spitzenbereich besonders groß, was für einen glatten, vcrletzungsfreien
Schnitt wesentlich ist.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.
Dabei sind für die Zwecke der Erfindung besonders vorteilhafte Dimensionierungen durch die Ansprüche 4
bis 6 und 16,17,18 definiert.
Da zwischen den beiden Elektroden eine elektrische Isolierung erforderlich ist, wird die bevorzugte Ausführungsform
i^ach Anspruch 7 vorgeschlagen.
Um den Kriechstromweg zwischc- den beiden Elektroden
zu vergrößern, kann die Mabna'ime nach Anspruch
8 verwendet werden.
Hierbei ist die Ausbildung nach Anspruch 9 zweckmäßig,
um Verluste durch Kriechströme unmittelbar zwischen den beiden Elektroden weiter herabzusetzen.
Um eine für einen optimalen Elektroschnitt geeignete Einstellung vornehmen zu können, ist die Ausbildung
nach Anspruch 10 vorteilhaft.
Bei der vorteilhaften Weiterbildung nach Anspruch 11 hat das Instrument etwa die Form eines Griffels,
welcher vom Operateur auch entsprechend gehalten und geführt werden kann. Unten vor dem Griffel steht
in der Mitte die die Schneidelektrode bildende Metallspitze vor.
Eine weitere vorteilhafte Ausführungsform ist durch Anspruch Ί2 gekennzeichnet. Werden hierbei noch die
Merkmale des Anspruches 13 vorgesehen, so kann das Schneidinstrument auch als normale Pinzette vtrwendet
werden.
Eine weitere vorteilhafte Ausführungform kennzeichnet sich durch die Merkmale des Anspruches 14.
Aufgrund dieser Ausbildung kann das Schneidinstrument auch zur Koagulation verwendet werden, wobei
die elektrischen Anpassungen an den Hochfrequenzgenerator entsprechend vorzunehmen sind.
Die Merkmale des Anspruches 15 ermöglichen ein verletzungsfreies Gleiten der Neutralelektrode beim
Schnitt auf der Gewebeoberfläche, wobei jede Glättung und Abrundung der Kontaktfläche der Neutralelektrode
zweckmäßig ist.
Besonders saubere Elektroabschnitte werden erzieh, wenn das aufrecht auf die Gewebeoberfläche aufgesetzte.,
eiiindungsgemäße Instrument mit einer Geschwindigkeit
von 1 bis 5, insbesondere 2 bis 4 und vorzugsweise etwa 3 cm/sec quer über die Gewebeoberfläche geführt
wird.
Die Erfindung wird im folgenden beispielsweise anhand der Zeichnur<j beschrieben; in dieser zeigt:
F i g. 1 eine teilweise geschnittene Seitenansicht eines erfindungsgemäßen elektrochirurgischen Hochfrequenz-Schneidinstrumentes
im Spitzenbereich, welcher mit dem Gewebe 16 eines Patienten in Verbindung steht,
F i g. 2 eine Ansicl.*. des Hochfrequenz-Schneidinstruments
nach F i g. 1 von unten,
Fig.3 eine schematische, teilweise geschnittene Seitenansicht
einer weiteren Ausführungsform eines erlin-
dungsgemäßen Hochfrequenz-Schneidinstrumentes in Pinzettenausführung und
Fig. 4 eine zu Fig. 3 analoge Ansicht des gleichen
Schneidinstrumentes nach dem Umschalten in die zur Durchführung einer Koagulation vorgesehene Stellung.
Nach den Fig.) und 2 ist an einem zylindrischen
Metallstab 19 unten eine dünne Metallspitze als Schneidelektrode 12 eingesetzt. Die Schneidelektrode
12 steht nach unten deutlich über den Metallstab 19 hervor. Der Metallstab 1 ist konzentrisch mit einer Isolierhülse
18 ummantelt, die aus einem hoch hitzebeständigen Keramik- oder Teflonmaterial besteht. Um die
Isolierhülse 18 herum ist in engem Kontakt ein dickwandiges Metallrohr 26 angeordnet, das nach F i g. 2 aus
zwei Halbschalen zusammengesetzt sein kann. Am unteren bzw. vorderen Ende des so gebildeten Instrumentenkörpers
13 ist das Metallrohr als halbkugelartige Kuppe ausgebildet, welche die Neutralelektrode 11 bil-
UH. L/it. r\ u
hat den Zweck, beim Schneiden in Richtung des Pfeiles /
in F i g. 1 ein besseres Gleiten auf dem Gewebe 16 zu gewährleisten.
Der Metallstab 19, die Isolierhülse 18 und die Neutralelektrode 11 sind gemäß Fig. 1 derart stufenförmig
axial gegeneinander versetzt, daß der Kriechstromweg zwischen dem Metallstab 19 und der Neutralelektrode
11 möglichst groß wird. Außerdem soll sich beim Aufsetzen
des Instrumentenkörpers 13 auf das Gewebe 16 gemäß F i g. 1 ein deutlicher Zwischenraum 27 zwischen
der Gewebeoberfläche und der vorderen Stirnfläche des Metallstabs 19 ausbilden, damit der Stromfluß weitgehend
von der Spitze der Schneidelektrode 12 aus in das Gewebe 16 hinein verläuft.
Das Metallrohr 26, die Isolierhülse 18 und der Metallstab 19 mit der Schneidelektrode 12 bilden zusammen
eine zur Achse 17 konzentrische Anordnung.
Der Metallstab 19 ist an den einen Pol, das Metallrohr
26 an den anderen Pol eines nicht dargestellten Hochfrequenzgenerators
mit einem nicht an das Erd- oder Massepotential gekoppelten Ausgang (floating output)
angeschlossen.
Die Wirkungsweise des erfindungsgemäßen Hochfrequenz-Schneidinsirurnerues
ist wie folgt:
Zunächst wird das Instrument gemäß Fig. 1 auf das
mittels tines Schnittes zu durchtrennende Gewebe 16 aufgesetzt, wobei sich zwischen dem Gewebe 16 und
der Neutralelektrode 11 eine kuppenariig ringförmige
Kontaktfläche 14 und zwischen der Spitze der Schneidelektrode 12 und dem Gewebe 16 eine sehr kleine trichterähnliche
Kontaktfläche 15 ausbildet. Wird jetzt der Hochfrequenzgenerator eingeschaltet, so fließt zwischen
der Schneidelektrode 12 und der Neutralelektrode 11 ein durch Stromlinien 28 angedeuteter Hochfrequenzstrom.
Die Dimensionierung der Schneidelektrode 12 und der Neutralelektrode 1 ί ist so gewählt, daß die Kontaktflächen
14,15 etwa im Verhältnis von 10:1 stehen. Wird jetzt der Instrumentenkörper 13 in Richtung des Pfeiles
/mit einer Geschwindigkeit von etwa 3 cm/sec über das Gewebe geführt, so wird in dem Gewebe ein der Eindringtiefe
der Schneidelektrode 12 entsprechender sauberer Schnitt durchgeführt, ohne daß es an der Kontaktfläche
zu Oberhitzungen oder gar Verklebungen kommt, weil die Stromdichte nahe der Schneidelektrode
12 sehr hoch Kt, im Abstand davon aber rapide abnimmt.
Um die Schnittiefe verstellen zu können, kann erfindungsgemäß entweder der Metallstab 19 innerhalb der
Isolierhülse 18 oder — wie in F i g. I angenommen — die Isolierhülse 18 innerhalb des Metallrohrs 26 axial
verschiebbar und durch einen Verstellmcchanismus 29 relativ zum Metallrohr 26 auf eine vorbestimmte Axialposition
eingestellt werden. Der Verstellmechanismus kann z. B. aus einer mit einer konzentrisch an ihr befestigten
kreisförmigen Betätigungsscheibe versehenen Verstellmutter 30 und einem Gewindestab 31 bestehen,
welcher mit der Isolierhülse 18 axial kraftschlüssig verbunden ist. Wird die Mutter 30, wie das in F i g. I angedeutet
ist, am Metallrohr 26 axial festgelegt, so wird durch ein Verdrehen der Mutter 30 die Isolierhülse 18
relativ zum Metallrohr 26 axial verstellt, was zu einem mehr oder weniger weiten Vorstehen der Schneidelektrode
12 über die Neutralelektrode 11 führt. Der Operateur
kann somit die Schnittiefe. mit der er arbeiten will, vorbestimmen. Diese Einstellmöglichkeit ist besonders
wichtig, weil bei bestimmten Elektrooperationen die /"" ntr* U— Unptnlit AnQ Krt>
-».. »trtf et m Ct rtrrtl* r\n\Ann ir» C rv
webeschichten andere Organe unbeabsichtigt verletzt werden. Durch Einstellen besonders geringer Schnittiefen
mittels des erfindungsgemäßen Verstellmechanismus können derartige Verletzungen völlig vermieden
werden, ohne daß es beim Elektroschneiden einer besonderen Aufmerksamkeit des Chirurgen bedarf.
Nach den F i g. 3 und 4 ist die die Schneidelektrode 12 beidseits umgebende Neutralelektrode 11 durch die
Spitzenbet Jche der beiden Branchen 21, 22 einer Pinzette
13' gebildet, wobei die beiden Branchen in ihrem oberi/T Bereich an einer Isolierkappe 32 gelagert sind.
Innerhalb der Isolierkappe 32 ist die den Metallstab
19 und die Schneidelektrode 12 enthaltende Isolicrhülsc 18 in nicht dargestellter Weise axial derart verschieblich
angeordnet, daß sie entweder in der Position nach Fig. 3 annähernd bündig mit der Neutralelektrodc 11
ist. wobei die Schneidelektrode 12 ähnlich Fig. 1 axial
nach vorne vorsteht oder nach Fig. 4 deutlich hinter den Branchenenden liegt, so daß die Pinzette 32 als
normales Klemminstrument verwendet werden kann.
Bei vorgeschobener Isolierhülse 18 gemäß F i g. 3 entsteht ein erfindungsgemäßes Hochfrequenz-Schneidinstrument,
in dem die beiden Branchen 21, 22 durch Fingerdruck von beiden Seiten gegen die isoiicrhüise 18
gedrückt werden.
In die Isolierkappe 32 ist eine Spule 33 mit zwei Wicklungen L 1 und L 2 eingebaut. Die eine Klemme der
Wicklung L 2 ist mit dem geerdeten Pol 25 eines Hochfrequenzgenerators 20 verbunden. Der andere Anschluß
der Wicklung L 2. der gleichzeitig die Verbindung zur Wicklung L 1 herstellu liegt gemäß Fig. 4 an
einem Kontakt eines Schließschalters 2 an, der einen Bestandteil eines durch das Verschieben der Isolicrhülsc
18 betätigten Mehrfach-Schalters 23 bildet. Der andere
Anschluß der Wicklung L 1 ist mit dem einen Kontakt des ersten Schließschalters 1 (F i g. 4) und mit dem einen
Kontakt eines weiteren Schalters 4 des Mehrfach-Schalters 23 verbunden.
Es ist darauf hinzuweisen, daß der Übersichtlichkeil halber in den Fig. 3 und 4 jeweils nur diejenigen Leitungsverbindungen
dargestellt sind, die für die Funk tion der betreffenden Schaltstellung der Pinzette erforderlich
sind. Tatsächlich sind also zwischen den verschiedenen Bauelementen die aus der Zusammenschau der
Fig. 3 und 4 ersichtlichen elektrischen Leitungsverbindungen
vorhanden.
Der Mehrfachschalter 23 besitzt insgesamt acht feststehende Kontaktpaare und fünf dazwischen an der Isoiierhüise
18 befindliche Schiebekontakte, weiche Einzel-
schulter 1 bis 8 bilden.
Der andere (linke) Kontakt des Einzelschaltcrs I ist
mit dem heißen Pol 24 des Hochfrequenzgenerators 20 verbunden. Der andere Kontakt des Schalters 2 ist mit
dem anderen Kontakt des Schalters 5 sowie mit der Branche 21 elektrisch leitend verbunden. Der Schalter 3
liegt einerseits an dem mit Erde verbundenen Pol 25 des HoehfrTquenzgenerators 20 und andererseits an der
Branche 22 der Pinzette 13'. Die Kontakte des Schalters 4 liegen an dem einen Kontakt des Schalters 1 und an
dem einen Kontakt eines Handschalters 34 Die Kontakte des Schalters 5 liegen am anderen Kontakt des Handschiiltcrs
34 bzw. dem anderen Kontakt des Schalters 2 und der Branche 21. Die Kontakte des Schalters 6 liegen
an der Schneidelektrode 12 und dem einen Kontakt des Schalters 8 bzw. dem heißen Pol 24 des Hochfrequenzgenerators
20. Die Kontakte des Schalters 7 liegen am geerdeten Pol 25 des Hochfrequenzgenerators 20 bzw.
der Branche 21. Die Kontakte des Schalters 8 sind mit dem einen Kontakt des Schalters 5 bzw. dem erwähnten
zweiten Kontakt des Handschalters 34 verbunden.
Der Handschaltcr 34 dient zum Einschalten des
Hochfrequenzgenerators 20.
In der Schneidposition nach Fig. 3 liegt die volle
I lochfrcqucnzspannung zwischen der Schneidelektrode 12 und der durch die Spitzenbereiche der Branchen 21,
22 gebildeten Neutralelektrode 11.
Der Stromfluß vom Hochfrequenzgenerator 20 erfolgt über die Pole 24, 25 in der aus F i g. 3 ersichtlichen
Weise. jo
llrf-idungsgemäß ist dem Hochfrequenzstrom ein
niederfrequenter Steuerstrom mit geringer Spannung überlagert. Wird der Handschalter 34 geschlossen, dann
fließt dieser niederfrequente Steuerstrom über die als Hochfrequenzfilter wirkenden Wicklungen der Spule 33
und weitere Hochfrequenzentkopplungsspulen 35 zu einem schemalisch angedeuteten Schaltrelais 36 im Hochfrequenzgenerator
20, welches beim Anziehen den Hochfrequenzgenerator 20 einschaltet. Durch Schließen
des Handschalters 34 kann also der Hochfrequenzgenerator 20 in Betrieb gesetzt werden.
Während die Schiebekkontakte an der Isolierhülse 18 bei der Schneidposition nach F i g. 3 nur die Schalter 6,
7,8 schließen, werden diese drei Schalter bei der Koaguliitionsposition
nach F i g. 4 geöffnet und stattdessen die Schalter 1 bis 5 geschlossen. Die Isolierhülse 18 ist in
dieser Position so weit zurückgezogen, daß die Schneidelektrode 12. die hier wieder als Nadel ausgebildet ist,
niehl mit dem Gewebe in Berührung kommen kann.
In der Schaltstellung nach F i g. 4 wird die volle Hochfrequcnzspannung
des Hochfrequenzgenerators 20 an die Wicklungen der Spule 33 angelegt. Die beiden Pinzettenbranchen
21, 22 sind in dieser Position elektrisch voneinander isoliert und erhalten eine reduzierte Hochficqucnzspannung
aus der Wicklung L 2 der Spule 33. Die Spannung wird also herabfansformieri.
Wird nun zwischen den Spitzenbereichen der Branchen 21. 22 Gewebe eingeklemmt und der Hochfrequenzgenerator
20 wieder durch Schließen des Handschalters 34 geschlossen, so fließt ein Hochfrequenz- ω
strom durch die Branchen 21, 22 in das Gewebe und erzeugt dort die zur Koagulation notwendige elektrische
Verlustwärme.
Auch bei der Sehaltposition nach Fig.4 fließt der dem Hochfrequenzstrom überlagerte niederfrequente
Steuerstrom Für das Einschaltrelais 36 über die Wicklung L 1 der Spule 33, wobei L 1 als Bestandteil eines
Resonanzschwingkreises wirkt.
Die Lastimpedanz für das Schneiden nach F i g. 3 und das Koagulieren nach F i g. 4 ist unterschiedlich. Während
man beim Schneiden mit einer Lastimpedanz von ca. 1000 Ohm rechnen muß. beträgt die Lastimpedanz
beim Koagulieren ca. 50 bis 100 Ohm. Um eine einwandfreie Funktion in den verschiedenen Schaltpositionen zu
erhalten, muß der Hochfrequenzgenerator 20 in seinem Ausgangsschwingkreis diesen Verhältnissen jeweils angepaßt
werden.
Ein besonderer Vorteil der Ausführungsform nach den F i g. 3 und 4 besteht darin, daß bei der Gebrauchsstellung für den Schneidvorgang die für diese Anwendung
geeignete Charakteristik des Hochfrequenzgenerators 20 zur Wirkung gebracht werden kann, welche
darin besteht, daß die Leistung mit zunehmendem Widerstand zunimmt. In der Gebrauchsstellung für Koagulation
gemäß F i g. 4 ergibt sich eine durch die Wicklung L 2 der Spule 33 bewirkte Leistungscharakteristik, welche
darin besteht, daß die Leistung mit zunehmendem Widerstand abfällt.
Auch der Hochfrequenzgenerator 20 kann einen erdfreien Ausgang haben, wobei der Pol 25 dann nicht wie
in F i g. 3 dargestellt an Masse liegt. Einer der wesentlichen Vorteile der erfindungsgemäßen bipolaren Anwendungstechnik
ist der durch Erdschlußfreiheit des Patientenstromkreises auf ein ungefährliches Minimum
reduzierte Fluß von Leckströmen zu masseführenden Teilen des Operationstisches.
Hierzu 2 Blatt Zeichnungen
Claims (17)
1. Elektrochirurgisches Hochfrequenz-Schneidinstrument
mit einem länglichen Instrumentenkörper, von dem in Gebrauchsstellung eine kleinflächige
Schneidelektrode nach vorne vorsteht, und mit einer in Kontakt mit dem Patienten bringbaren, großflächigen
Neutralelektrode nahe der Schneidelektrode, wobei die Neutralelektrode beidseitig der Schneidelektrode
und gegenüber dieser axial zurückversetzt am Instrumentenkörper angeordnet ist, dadurch
gekennzeichnet, daß die im wesentlichen zentrisch zur Neutralelektrode (11) angeordnete
Schneidelektrode (12) als axial vorstehende Spitze ausgebildet ist und der Flächenbereich des patientennahen
stirnseitigen Endes der Neutralelektrode (11) die Gewebekontaktfläche bildet und diese mehr
als das siebenfache der Gewebekontaktfläche der Schneidelektrode (12) beträgt
2. Schneidinstrument nach Ansprach 1, dadurch
gekennzeichnet, daß die Gewebekontaktfläche der Neutralelektrode (11) kleiner als das 20fache und
vorzugsweise kleiner als das 15fache der Gewebekontaktfläche der Schneidelektrode (12) ist.
3. Schneidinstrument nach Anspruch 1 oder 2, dadurch
gekennzeichnet, daß die Gewebekontaktfläche der Neutralelektrode etwa das lOfache der Gewebekontaktfläche
der Schneidelektrode (12) beträgt.
4. Schneidin -'rument nach einem der vorhergehenden
Ansprüche, dadurch gekennzeichnet, daß die Schneidelektrode (12) um 0,5, vorzugsweise 1 mm
bis 5 mm über die Neutralelektrode (11) axial vorsteht.
5. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß
der radiale Abstand der Neutralelektrode (11) von der Achse des Instrumentenkörpers (13, 13') am distalen
Ende 2 bis 6, insbesondere 3 bis 5 und vorzugsweise etwa 4 mm beträgt.
6. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß
der Abstand der Schneidelektrode (12) von der Neutralelektrode (11) in Richtung senkrecht zur Achse
des Instrumentenkörpers (13,13') 5 bis 15 und insbesondere
etwa 10 mm beträgt.
7. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die
Schneidelektrode (12) von einem innerhalb der Neutralelektrode (11) angeordneten länglichen Isolierkörper
(18) axial vorsteht, der als Isolierhülse (18) ausgebildet ist, in der sich ein Metallsieb (19) befindet,
der an den Generator (20) angeschlossen ist und die Schneidelektrode (12) trägt.
8. Schneidinstrument nach Anspruch 7, dadurch gekennzeichnet, daß der Isolierkörper (18) gegenüber
der Kontaktfläche (14) der Neutralelektrode (11) axial zurückversetzt ist.
9. Schneidinstrument nach Anspruch 7, dadurch gekennzeichnet, daß der Metallstab (19) gegenüber
der Neutralelektrode (11) und vorzugsweise auch gegenüber der Isolierhülse (18) axial zurückversetzt
ist.
10. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die
Schneidelektrode (12) axial verstellbar am Instrumentenkörper(13,13')angeordnet
ist.
11. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die
Neutralelektrode im Querschnitt kreisförmig ausgebildet ist und die Schneidelektrode (12) konzentrisch
umgibt.
12. Schneidinstrument nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Neutraielektrode
(11) durch die patientennahen Enden der beiden Branchen einer den Instrumentenkörper bildenden
Pinzette (13') verwirklicht ist, zwischen denen der Isolierkörper (18) mit der Schneidelektrode
(12) angeordnet ist
13. Schneidinstrument nach Anspruch 12, dadurch gekennzeichnet, daß die Isolierhülse mit der
Schneidelektrode (12) relativ zu den Branchen der Pinzette (13') zurückziehbar ist.
14. Schneidinstrument nach Anspruch 13, dadurch gekennzeichnet, daß die beiden Branchen (21, 22)
der Pinzette (13') voneinander isoliert sind und ein Schalter (23) vorgesehen ist, der bei zurückgezogener
Isoiierhüise (18) und Schneidelektrode (12) die
Branchen (20, 21) an die beiden gegeneinander Spannung führenden Pole (24, 25) des Hochfrequenzgenerators
(20) anlegt.
15. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeirhnet, daß die
Neutralelektrode an dem mit dem Gewebe (16) in
Berührung tretenden Ende im wesentlichen halbkugelförmig abgerundet ist.
16. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die
nadeiförmige Spitze der Schneidelektrode (12) einen Durchmesser von 0,1 bis 0,5, insbesondere 0,2 bis 0.4
und vorzugsweise etwa 0,3 mm hat.
17. Schneidinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die
Spitze der Schneidelektrode (12) eine Länge von 2 bis 5 mm und vorzugsweise etwa 3 mm hat.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3423356A DE3423356C2 (de) | 1984-06-25 | 1984-06-25 | Elektrochirurgisches Hochfrequenz-Schneidinstrument |
US06/892,883 US4706667A (en) | 1984-06-25 | 1986-07-28 | Electro surgical high frequency cutting instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3423356A DE3423356C2 (de) | 1984-06-25 | 1984-06-25 | Elektrochirurgisches Hochfrequenz-Schneidinstrument |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3423356A1 DE3423356A1 (de) | 1986-01-02 |
DE3423356C2 true DE3423356C2 (de) | 1986-06-26 |
Family
ID=6239081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3423356A Expired DE3423356C2 (de) | 1984-06-25 | 1984-06-25 | Elektrochirurgisches Hochfrequenz-Schneidinstrument |
Country Status (2)
Country | Link |
---|---|
US (1) | US4706667A (de) |
DE (1) | DE3423356C2 (de) |
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DE3423356A1 (de) | 1986-01-02 |
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