DE19738457A1 - Verfahren und Vorrichtung für die In-vivo-Tiefenkoagulation biologischer Gewebevolumina bei gleichzeitiger Schonung der Gewebeoberfläche mit hochfrequentem Wechselstrom - Google Patents
Verfahren und Vorrichtung für die In-vivo-Tiefenkoagulation biologischer Gewebevolumina bei gleichzeitiger Schonung der Gewebeoberfläche mit hochfrequentem WechselstromInfo
- Publication number
- DE19738457A1 DE19738457A1 DE1997138457 DE19738457A DE19738457A1 DE 19738457 A1 DE19738457 A1 DE 19738457A1 DE 1997138457 DE1997138457 DE 1997138457 DE 19738457 A DE19738457 A DE 19738457A DE 19738457 A1 DE19738457 A1 DE 19738457A1
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- electrodes
- tissue
- electrode
- pairs
- coagulation
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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
- A61B18/14—Probes or electrodes therefor
- A61B18/1442—Probes having pivoting end effectors, e.g. forceps
- A61B18/1445—Probes having pivoting end effectors, e.g. forceps at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
-
- 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
- A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
- A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
- A61B2018/00029—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids open
-
- 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
- A61B2018/00773—Sensed parameters
- A61B2018/00791—Temperature
-
- 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
- A61B2018/1472—Probes or electrodes therefor for use with liquid electrolyte, e.g. virtual electrodes
Description
Ziel ist die Entwicklung eines Applikationssystems für die
Übertragung und partiellen Anwendung von hochfrequentem
Wechselstrom zur In-vivo-Tiefenkoagulation biologischer
Gewebevolumina bei gleichzeitiger Schonung der Gewebe
oberfläche für interne und externe Anwendungen.
Es ist grundsätzlich bekannt, daß in der HF-Chirurgie hoch
frequenter Wechselstrom in dem dafür vorgesehenen Fre
quenzbereich (300 kHz bis 2 MHz) zur Gewebekoagulation
oder zur Gewebetrennung (Elektrotomie) Anwendung findet.
Dabei unterscheidet man zwei Anwendungstechniken: die
monopolare und die bipolare HF-Technik. Bei der monopola
ren Anwendungstechnik wird eine der beiden Elektroden als
großflächige Patientenableitung (Neutralelektrode NE) aus
gelegt und in der Nähe der Eingriffsstelle am Patienten ange
bracht (Oberarm, Oberschenkel etc.). Die eigentliche Arbeit
selektrode, die sog. Aktivelektrode, ist entsprechend der vor
gesehenen Anwendung (Koagulation bzw. Elektrotomie) aus
gelegt. Zur Gewebekoagulation finden großflächige Kugel-,
Platten- oder Nadelelektroden, zur Gewebetrennung dünne
Nadel-, Lanzetten- oder Schlingenelektroden Verwendung.
Die bipolare Technik unterscheidet sich insofern von der mo
nopolaren Technik, daß hier die großflächige Neutralelektrode
miniaturisiert und in die unmittelbare Nähe der sog. Aktive
lektrode gebracht wird. Damit kann gewährleistet werden,
daß die Anwendung von hochfrequentem Wechselstrom auf
die unmittelbare Eingriffsstelle begrenzt wird und damit ein
hohes Maß an Sicherheit für Patient und Anwender gewährlei
stet. Unfälle, verursacht durch kapazitive Leckströme oder
Verbrennungen an der Neutralelektrode, können somit nicht
mehr auftreten Ferner werden durch den viel geringeren
Lastwiderstand des Gewebes viel geringere Generatorleistun
gen zur Erzielung desselben thermischen Gewebeeffektes be
nötigt. Es sind nach dem Stand der Technik eine Reihe neuer
Applikationssysteme in bipolarer Technik für die Elektrotomie
und Gewebekoagulation entwickelt worden.
Bei der Gewebekoagulation unterscheidet man die sog. Ober
flächenkoagulation und die Tiefenkoagulation. Zur Oberflä
chenkoagulation finden in der bipolaren Technik zwei parallel
angeordnete Tastelektroden Verwendung, die auf das Gewebe
aufgesetzt werden können. Zur Tiefenkoagulation
(Desikkation) finden Nadelelektroden Verwendung. In bipola
rer Technik werden solche Applikatoren z. B. zur Myomthera
pie eingesetzt. Diese Applikatoren bestehen aus zwei parallel
angeordneten Nadelelektroden, die in das Gewebe eingesto
chen werden können. Dadurch wird das Gewebe zwischen
beiden Elektroden, wie auch bei der Oberflächenkoagulation
mit Tastelektroden, durch den Stromfluß erhitzt und damit
koaguliert. Desweiteren gibt es eine Mischform der Oberflä
chen- und Tiefenkoagulation bei den HF-Faßzangen. Diese
gibt es in monopolaren (2 Elektroden mit gleichem Potential +
Neutralelektrode) und bipolaren Ausführungen (2 Elektroden
mit unterschiedlichem Potential). Dabei wird das Gewebe zwi
schen den beiden Elektroden (Branchen) über das Handstück
mechanisch komprimiert und anschließend durch den Strom
fluß koaguliert. Diese sogenannte Koaptation (Koagulation +
Adaption) ermöglicht es, das Gewebe über die Oberfläche bis
tief in das Gewebe zu koagulieren, ferner Hohlorgane, Lumen
oder Gefäße unter Druck thermisch zu verschweißen (z. B.
arterielle Blutgefäße, Eileiter). Der bei der Koagulation ent
stehende thermische Effekt ist eine Funktion der herrschenden
Stromdichteverteilung am und im Gewebe. Aufgrund des Im
pedanzsprunges zwischen Elektrode und Gewebe entsteht an
der Übergangsstelle zwischen Elektrode und Gewebe die
höchste Stromdichte. Im Gewebe nimmt die Stromdichte mit
zunehmendem Abstand von der Elektrode ab. Daher ist die
generierte Wärme an der Gewebeoberfläche bei den derzeit
verfügbaren HF-Zangen immer größer bzw. gleich der in der
Tiefe erzeugten Wärme.
Für die In-vivo-Tiefenkoagulation sind nach dem Stand der
Technik jedoch keine Applikationssysteme bekannt, die durch
ihre technische Ausführung an der Elektroden-
Gewebekontaktfläche geringere Wärmemengen erzeugt als in
der Tiefe des Gewebes und damit eine thermische Schonung
der Gewebeoberfläche (z. B. Haut) sicherstellen kann. Aus der
Anmeldung DE 195 41 566 A1 ist bekannt, daß sich über
speziell modifizierte Elektroden die elektrische Feldausbrei
tung für den Einsatz zur interstitiellen Tiefenkoagulation be
einflussen läßt, sowie Maßnahmen zur Optimierung der Lei
stungsankopplung an das Gewebe treffen lassen.
In grundlegenden Untersuchungen konnte gezeigt werden,
daß beim Einsatz spezieller Elektroden in Form und Material,
deren geometrischer Anordnung und elektrischer Verschal
tung, sowie der Verwendung spezieller Spül-, und Beschich
tungstechniken, eine interne bzw. externe In-vivo-
Tiefenkoagulation von biologischem Gewebe unter thermi
scher Schonung der Gewebekontaktfläche möglich ist. Ferner
wird dadurch auch das Anbacken und Verschmutzen der
Elektrode verhindert.
Das erfindungsgemäße HF-Applikationssystem, bei dem
Branchen mit Elektrodenpaaren unterschiedlicher elektrischer
Potentiale zur In-vivo-Tiefenkoagulation von biologischen
Gewebe unter gleichzeitiger Schonung der Gewebeoberfläche
Verwendung finden, kennzeichnet sich dadurch aus, daß
durch die Elektrodenanordnung und deren spezielle Ausfüh
rung in der Tiefe des Gewebes eine höhere Temperatur ent
stehen kann als an der Elektroden-Gewebeübergangsstelle.
Die erfindungsgemäße Lösung besteht darin, daß hier zwei
oder mehrere Elektrodenpaare in symmetrischer oder unsym
metrischer Anordnung in Bezug auf die drei Raumrichtungen
einander gegenüberstehen, daß jedes Elektrodenpaar unter
schiedliche elektrische Potentiale aufweist und die einzelnen
Elektrodenpaare teilweise voneinander galvanisch entkoppelt
sind. Durch die Verwendung galvanisch entkoppelter Elektro
denpaaranordnungen wird ermöglicht, eine Superposition der
Stromdichte in tieferen Gewebeschichten zu erzeugen.
Durch eine bevorzugt zangenartige Vorrichtung, an deren
beiden vorderen Branchen das Elektrodenpaar oder die Elek
trodenpaare auf der jeweiligen Brancheninnenseite ange
bracht sind, wird das zu koagulierende Gewebe zunächst me
chanisch fixiert und komprimiert sowie anschließend mit einer
definierten HF-Leistung beaufschlagt. In der erfindungsgemäß
bevorzugten Ausführungsform einer zangenartige Vorrichtung
sind desweiteren die beiden Branchen gegeneinander elek
trisch isoliert und besitzen des weiteren unterschiedlich elek
trische Potentiale. (Fig. 1).
In der erfindungsgemäßen Lösung stehen die Elektroden ent
weder in direktem Kontakt mit dem Gewebe oder über eine
spezielles Kontaktfluid, wie Gel, NaCl-Lsg. oder andere ge
eigneten Substanzen oder Materialien zur Verminderung der
Übergangsimpedanz (Elektrode(Gewebe) sowie zur Kühlung
der Gewebeoberfläche. Diese Substanz wird entweder vorher
zwischen die Elektroden und das Gewebe gebracht oder über
das Applikationssystem selbst über geeignete Zuführungen
(Bohrungen, Membranen etc.) eingebracht. Die erfindungs
gemäß vorzugsweise starren Branchen bestehen entweder aus
den Elektroden selbst, wie z. B. aus einer elektrisch leitenden
metallischen Legierung, einem elektrisch leitenden Kunststoff,
einem elektrisch leitenden Biomaterial oder anderen geeigne
ten Materialien. Sie können aber auch aus einem dielektri
schen Material wie z. B. Kunststoff gefertigt werden, die ihrer
seits wiederum die eigentlichen Elektroden, bestehend aus den
o.g. Materialien aufnehmen können. Die Form der Elektroden
ist vorzugsweise flächig, kugelförmig oder zylindrisch oder sie
weisen eine andere geeignete Form auf, um störende elektri
sche Spitzeneffekte auf der Gewebeoberfläche zu vermeiden.
Eine weitere Spezifikation der erfindungsgemäßen Lösung ist
die hohle Ausbildung der Elektroden. Diese können aber auch
in ihrer Auslegung als massive Baugruppe gefertigt werden.
Die erfindungsgemäße Lösung schließt die Verwendung einer
speziellen Spülvorrichtung mit ein. Die Elektroden werden
entweder vor oder während der HF-Applikation durch eine
geeignete Spüleinrichtung elektrisch direkt mit dem Gewebe
angekoppelt, um einen Austrocknen und Erwärmen des Ge
webes zu vermeiden. Diese Spülung kann vor oder während
der Applikation, kontinuierlich oder intermittierend erfolgen.
Als Spülvorrichtungen kommen ein offener Flüssigkeitskühl-
und Spülkreislauf oder eine Verdampfungs-kühlung zur An
wendung. Dazu werden erfindungsgemäß die einzelnen Elek
troden durch Einbau eines offenen Flüssigkeitskühlkreislaufes
und/oder oder das vorherige oder parallele Besprühen mit
einem speziellen Kälte- oder Kontaktspray (Verdampfungs
kühlung/Kontaktierung) versehen. Das verwendete Spülmittel
besteht in der erfindungsgemäßen Lösung aus einer physiolo
gischen Kochsalzlösung oder anderen geeigneten Flüssigkei
ten oder Gasen.
In Weiterführung des Erfindungsgedankens kann statt der
starren Elektroden oder Branche auch an eine flexible Ausfüh
rung gedacht werden. Dabei könnten sich die Elektroden bes
ser an die Gewebeoberfläche anpassen. Die Elektroden oder
Branchen könnten dabei aus flexiblen oder semi-flexiblen
Materialien oder Verbundmaterialien bestehen.
In einer weiteren vorteilhaften Ausbildung des erfindungsge
mäßen Übertragungssystems werden die elektrischen Zulei
tungen auf der Innenseite oder innerhalb der Griffe der vor
zugsweise zangenförmigen Vorrichtung bis zu den Elektroden
an der Innenseite der beiden Branchen geführt. Ferner wird
durch geeignete mechanische Abstandshalter wie Potentio
meter und einem integrierten Drucksensor sichergestellt, daß
ein definierter Anpressdruck der Elektroden ans Gewebe und
ein definierter Abstand der beiden Branchen eingehalten wird,
um eine entsprechende Leistungseinstellung am HF-Generator
vornehmen zu können. Dieser Anpressdruck und Abstand sind
variabel und können auf die einzelne Applikation eingestellt
werden.
In Weiterführung des Erfindungsgedankens ist auch ein pa
ralleler Betrieb mehrerer zangenförmiger Vorrichtungen reali
sierbar. Hierbei werden erfindungsgemäß mehrere vorzugs
weise zangenförmige Vorrichtungen, wie oben beschrieben,
mit entsprechenden Elektrodenanordnungen durch einen HF-
Generator gespeist der mehrere galvanisch entkoppelte Aus
gangskanäle besitzt oder über eine separate HF-Weiche, die
vom Ausgangsteil des Generators gespeist die HF-Leistung
entsprechend dem Bedarf in mehrerer Ausgangskanäle galva
nisch entkoppelt aufteilt. Die vorzugsweise zangenförmigen
Vorrichtungen können einzeln oder gleichzeitig eingesetzt
werden. Dadurch wird es möglich, gleichzeitig oder zumindest
unter Ersparnis von Zeit und Kosten HF-Applikationen an
verschiedenen Gewebestellen eines Tieres oder eines Men
schen oder mehrerer Tiere oder mehrerer Menschen gleich
zeitig durchzuführen.
Eine bevorzugtes Ausführungsbeispiel der Erfindung des vor
herig beschriebenen HF-Applikationssystems stellt eine Vor
richtung zur mimal traumatisierenden Sterilisierung von
männlichen Säugetieren oder Menschen dar. Eine bevorzugte
Anwendung ist die Sterilisierung von Bullen, Hengsten,
Hammeln, Böcken, Rüden oder Katern jeden Alters. Durch
den Einsatz dieser erfindungsgemäßen Lösung zur Verödung
der Samenleiter unter Schonung der Gewebeoberfläche steht
somit erstmals ein nicht-invasives, intern oder extern ober
flächlich angewandtes Tiefenkoagulationsverfahren zur Ver
fügung.
Es folgt die Beschreibung der Abbildungen.
Dargestellt ist eine zangenartige Vorrichtung (3) bestehend
aus zwei Branchen verbunden über ein isolierendes Gelenk (2)
mit integriertem Potentiometer (2). In den einstellbar gela
gerten (2a) Elektrodenhaltern am Ende der beiden Branchen
(1) befinden sich die Elektroden (1a), Spülkanäle (1b) und
Sensoren (1c) (Druck, Temperatur) in ihren erfindungsgemä
ßen Konfigurationen (1.1-1.4). Die Elektroden werden über
geeignete elektrische Zuleitungen (4) mit einer Energiequelle
(5) (HF-Generator) verbunden. Ferner befinden sich an der
Vorrichtung Anschlüsse für eine Spülung (6) der Elektroden-
Gewebe-Kontaktfläche.
Claims (12)
1. Verfahren und Vorrichtung für die In-vivo-
Tiefenkoagulation biologischer Gewebevolumina mit
hochfrequenten Wechselströmen
dadurch gekennzeichnet, daß
Elektroden mit unterschiedlichem elektrischen Potential
verwendet werden. Bei gleichzeitiger Schonung der
Gewebeoberfläche.
2. Verfahren und Vorrichtung nach 1)
dadurch gekennzeichnet, daß
als Elektrodenmaterial eine metallische Legierung oder
ein elektrisch leitender Kunststoff oder ein elektrisch
leitendes Biomaterial oder andere elektrisch leitende
Materialien Anwendung finden.
3. Verfahren und Vorrichtung nach 1) und 2)
dadurch gekennzeichnet, daß
die Form der Elektroden flächig, kugelförmig oder zy
lindrisch ist oder eine andere geeignete spitzen- und
kantenfreie Form aufweisen.
4. Verfahren und Vorrichtung nach 1), 2), 3)
dadurch gekennzeichnet, daß
die Elektroden zugänglich als Hohlkörper ausgelegt
sind.
5. Verfahren und Vorrichtung nach 1), 2), 3)
dadurch gekennzeichnet, daß
die Elektroden zugänglich massiv ausgelegt sind.
6. Verfahren und Vorrichtung nach 1) bis 5)
dadurch gekennzeichnet, daß
sich zwei oder mehrere Elektrodenpaare gegenüberste
hen. Insbesondere stehen sich die Elektrodenpaare in
Bezug auf die drei Raumrichtungen symmetrisch oder
unsymmetrisch gegenüber.
7. Verfahren und Vorrichtung nach 6)
dadurch gekennzeichnet, daß
die Elektrodenpaare voneinander ganz, teilweise oder
nicht galvanisch entkoppelt betrieben werden können.
8. Verfahren und Vorrichtung nach 1) bis 7)
dadurch gekennzeichnet, daß
das Elektrodenpaar oder die Elektrodenpaare das zu
koagulierende Gewebe mit Hilfe einer vorzugsweise
zangenartigen Vorrichtung zwischen zwei oder mehre
ren gegeneinander elektrisch isolierten Branchenpaaren
fixiert bzw. fixieren, bevor das Gewebe mit dem hoch
frequenten Wechselstrom mit einer Frequenz zwischen
100 kHz und 1 GHz beaufschlagt wird.
9. Verfahren und Vorrichtung nach 8)
dadurch gekennzeichnet, daß
die Elektroden nach Anspruch 4) und 5) direkt oder
indirekt über geeignete Zuführungen wie Bohrungen mit
geeigneten Substanzen wie Kochsalzlösungen zu spülen
sind und zwischen Gewebe und Elektrode in Kontakt
gebracht werden um diese zu kühlen und das Austrock
nen des Gewebes zu verhindern. Als Spülvorrichtungen
kommen ein Flüssigkeitsspülkreis-lauf oder eine Ver
dampfungskühlung zur Anwendung.
10. Verfahren und Vorrichtung nach 8) und 9)
dadurch gekennzeichnet, daß
das Verfahren und die Vorrichtung dem In-vivo-
Tiefenkoagulieren von biologischen Geweben und funk
tionellen Gewebeverbünden, d. h. von Organen, Organ
teilen, Hohlorganen, Lumen oder Gefäßen dient.
11. Verfahren und Vorrichtung nach 10)
dadurch gekennzeichnet, daß
während der Applikation ein spezielles Kontaktfluid zur
Verminderung der Übergangsimpedanz zwischen die
Elektroden und das Gewebe gebracht wird.
12. Verfahren und Vorrichtung nach 1) bis 11)
dadurch gekennzeichnet, daß
das Verfahren und die Vorrichtung der In-vivo-
Tiefenkoagulation des Samenleiters des Menschen oder
eines Tieres mit dem Ziel der Sterilisierung dient.
Priority Applications (1)
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DE1997138457 DE19738457B4 (de) | 1997-09-03 | 1997-09-03 | Verfahren und Vorrichtung für die In-vivo-Tiefenkoagulation biologischer Gewebevolumina bei gleichzeitiger Schonung der Gewebeoberfläche mit hochfrequentem Wechselstrom |
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DE1997138457 DE19738457B4 (de) | 1997-09-03 | 1997-09-03 | Verfahren und Vorrichtung für die In-vivo-Tiefenkoagulation biologischer Gewebevolumina bei gleichzeitiger Schonung der Gewebeoberfläche mit hochfrequentem Wechselstrom |
Publications (2)
Publication Number | Publication Date |
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DE19738457A1 true DE19738457A1 (de) | 1999-03-04 |
DE19738457B4 DE19738457B4 (de) | 2009-01-02 |
Family
ID=7841043
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DE1997138457 Expired - Lifetime DE19738457B4 (de) | 1997-09-03 | 1997-09-03 | Verfahren und Vorrichtung für die In-vivo-Tiefenkoagulation biologischer Gewebevolumina bei gleichzeitiger Schonung der Gewebeoberfläche mit hochfrequentem Wechselstrom |
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