ES2214527T3 - Aparato quirurgico de encendido de plasma de gas. - Google Patents
Aparato quirurgico de encendido de plasma de gas.Info
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- ES2214527T3 ES2214527T3 ES96902402T ES96902402T ES2214527T3 ES 2214527 T3 ES2214527 T3 ES 2214527T3 ES 96902402 T ES96902402 T ES 96902402T ES 96902402 T ES96902402 T ES 96902402T ES 2214527 T3 ES2214527 T3 ES 2214527T3
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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
- A61B18/042—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating using additional gas becoming plasma
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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
- A61B18/1206—Generators therefor
- A61B2018/1213—Generators therefor creating an arc
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Abstract
SE PRESENTA UN APARATO Y UN METODO PARA IGNITAR PLASMA EN UN SISTEMA QUIRURGICO. SE GENERA UNA DESCARGA EN CORONA EN UNA PIEZA DE MANO QUIRURGICA PARA ENCENDER UN ARCO DE PLASMA (19) PARA OPERACIONES QUIRURGICAS. LAS VENTAJAS SON MAYOR FIABILIDAD Y REPETIBILIDAD DE LA IGNICION DEL ARCO DE PLASMA (19). EL APARATO CONSTA DE UNA PIEZA DE MANO QUE INCORPORA UN ELECTRODO ACTIVO, UN CONDUCTO PARA EL GAS IONIZABLE (12) Y UN ELECTRODO CORONA DE RETORNO (17). EL ELECTRODO CORONA DE RETORNO (17) TIENE UN EXTREMO EN EL SOPORTE (11) Y CERCA DEL EXTREMO DISTAL (20) DEL SOPORTE (11). EL ELECTRODO CORONA DE RETORNO (17) ESTA CONECTADO ELECTRICAMENTE A UNA VIA DE RETORNO DEL GENERADOR ELECTROQUIRURGICO. SE GENERA UN CAMPO ELECTRICO NO UNIFORME ENTRE EL ELECTRODO ACTIVO (14) Y EL ELECTRODO CORONA DE RETORNO (17) DE INTENSIDAD SUFICIENTE COMO PARA FORMAR UNA CORONA CERCA DEL ELECTRODO ACTIVO (14). PUEDE SITUARSE OTRO ELECTRODO DE RETORNO (17) EN EL PACIENTE (25) O CONFIGURARSE EL APARATO PARA FUNCIONAMIENTOBIPOLAR ELECTROQUIRURGICO SITUANDO EL ELECTRODO DE RETORNO (17) EN LA PIEZA DE MANO. UN MATERIAL DIELECTRICO SEPARA EL ELECTRODO ACTIVO (14) Y EL ELECTRODO DE CORONA DE RETORNO (17). HAY UN ACOPLAMIENTO NOTABLEMENTE CAPACITIVO ENTRE EL ELECTRODO ACTIVO (14) Y EL ELECTRODO DE CORONA DE RETORNO (17). HAY UN ACOPLAMIENTO NOTABLEMENTE RESISTIVO ENTRE EL ELECTRODO ACTIVO (14) Y EL ELECTRODO DE RETORNO (17).
Description
Aparato quirúrgico de encendido de plasma de
gas.
Este invento se refiere a los dispositivos
quirúrgicos que incorporan energía
electro-quirúrgica y plasmas de gases y, más
específicamente, a un aparato mejorado para encender el plasma.
Un plasma de gas es un gas ionizado que es capaz
de conducir energía eléctrica. Se usan los plasmas en dispositivos
quirúrgicos para conducir energía
electro-quirúrgica hasta un paciente. El plasma
conduce la energía proporcionando una vía de baja resistencia
eléctrica. La energía electro-quirúrgica seguirá
esta vía y podrá, por tanto, usarse para cortar, coagular, desecar,
o fulgurar sangre o tejido del paciente. Una de las ventajas de este
procedimiento es que no se requiere contacto físico entre un
electrodo y el tejido que se está tratando.
**El plasma se crea por medio de ionizar un gas.
Algunos sistemas electro-quirúrgicos tienen una
fuente de gas ionizable regulable que es dirigida con un flujo
estable hacia un paciente. Un gas que se usa típicamente de este
modo es el argón, sin embargo, también pueden usarse otros gases.
Una ventaja de tener un flujo de gas dirigido es que el arco de
plasma puede ser enfocado de forma precisa y puede ser dirigido por
el flujo.
Los sistemas quirúrgicos que no incorporan una
fuente de gas regulado puede ionizar el aire del ambiente entre el
electrodo activo y el paciente. El plasma así creado conducirá
energía electro-quirúrgica al paciente, aunque el
arco de plasma aparecerá típicamente más disperso especialmente en
comparación con sistemas que tienen un flujo regulado de gas
ionizable.
Una de las dificultades de usar un plasma es cómo
iniciarlo o encenderlo. Se requiere un fuerte campo eléctrico para
acelerar suficientes iones libres dentro del gas, de tal modo que
se inicie una cascada de colisiones ionizantes que origina el
plasma. Esto se llama a veces "encendido" o "cebado" del
plasma. Una vez que el plasma se ha cebado, puede mantenerse con
potenciales de campo eléctrico más bajos.
Actualmente se usan varias técnicas para crear
fuertes campos eléctricos que puedan encender el plasma. Una
técnica consiste en mover la punta de un electrodo muy cerca del
lugar de la cirugía. El campo eléctrico a lo largo de un camino
entre un electrodo y el lugar de la cirugía aumentan cuando
disminuye la separación, y puede alcanzar un nivel suficiente como
para encender el plasma. La desventaja de este método es que un
cirujano debe manipular cuidadosamente el electrodo para moverlo
cerca del lugar de la cirugía sin tocar realmente el tejido. Si el
electrodo llega a estar en contacto con el tejido puede pegarse,
causando eschar? se deposite sobre el electrodo. Durante los
procedimientos laparoscopios, es a menudo difícil para un cirujano
sentir la proximidad del electrodo al tejido.
Otra técnica para encender el plasma es usar un
electrodo puntiagudo que genera un campo eléctrico mayor en la
punta del electrodo. Sin embargo, un electrodo puntiagudo puede ser
indeseable si el cirujano requiere un electrodo en forma de
cuchilla para cortar y para otra manipulación de tejidos. Otra
técnica consiste en proporcionar puntas de alto voltaje al electrodo
quirúrgico hasta que un detector indique que se ha cerrado el
circuito con el electrodo de retorno. Aunque está técnica es
efectiva, requiere una electrónica complicada y componentes capaces
de soportar los voltajes elevados.
La patente de EE.UU. 4.060.088 se refiere a un
método electro-quirúrgico y a un aparato de
coagulación por fulguración. El aparato tiene una fuente de gas
ionizable inerte que rodea a un electrodo
electro-quirúrgico tubular. Se describe una fuente
de descargas periódicas de energía
electro-quirúrgica que es usada para iniciar el
plasma. También se describe una descarga auxiliar para ayudar en el
cebado del plasma, en que la descarga auxiliar es el resultado de
un campo eléctrico establecido entre el dedo del doctor y el
electrodo activo.
La patente de EE.UU: 4.781.175 tiene un chorro de
gas ionizable para retirar los fluidos corporales y coagular o
alcanzar fulguración en forma de un eschar mejorado. Se muestran
los circuitos y la lógica de computadores para controlar el flujo
del chorro de gas y la energía
electro-quirúrgica.
La patente de EE.UU. 4.901.720 y el nuevo
registro de la misma Re. 34.432 se ocupan de la frecuencia de
impulsos de energía, aplicados para mantener la corriente de fugas
dentro de límites aceptables a la vez que tienen suficiente energía
para iniciar la ionización. Se crean un circuito y diagramas lógicos
para controlar los impulsos de energía mediante el ancho de los
pulsos, la resonancia, la forma de onda y la salida.
La patente de EE.UU. 4.040.426 tiene un método y
un aparato para encender un plasma mediante el uso de partículas
cargadas que se generan cuando el gas inerte fluye a lo largo de un
tubo. Esta carga sale del tubo a través de las puntas del tubo que
son puntiagudas hacia dentro, y se usa para ayudar al cebado del
plasma.
La patente de EE.UU. 4.901.719 tiene una unidad
electro-quirúrgica en combinación con un sistema de
entrega de gas ionizable, donde hay también una mejora relativa al
medio de conducción del gas.
El documento
US-A-4.057.064 describe el
suministro de partículas cargadas usando una descarga eléctrica entre un electrodo eléctricamente conductor y una parte de un electrodo activo. El documento US-A-3.903.891 describe un conjunto de un electrodo que no necesita ninguna estructura auxiliar para encender el plasma.
suministro de partículas cargadas usando una descarga eléctrica entre un electrodo eléctricamente conductor y una parte de un electrodo activo. El documento US-A-3.903.891 describe un conjunto de un electrodo que no necesita ninguna estructura auxiliar para encender el plasma.
El documento WO 96/24301, la técnica anterior en
el sentido del Art. 54(3) EPC, describe un aparato para
producir una descarga de corona para iniciar un arco de plasma para
que sea aplicado por un cirujano al tejido o fluidos corporales de
un paciente. La corona comprende un mango para que el cirujano
pueda controlarlo durante la aplicación del arco de plasma, teniendo
el mango un extremo distal para apuntar al paciente, una fuente
regulada de gas ionizable, un paso a través del mango y conectado
en la proximidad de una fuente regulada de gas ionizable para que
pueda pasar a través de él, un electrodo activo en el paso que se
extiende desde el extremo distal, estando el electrodo activo y el
gas ionizable regulado en contacto, una fuente de energía eléctrica
de alta frecuencia conectada al electrodo activo, un electrodo de
retorno que durante el uso está conectado a la fuente de energía
eléctrica de alta frecuencia, estando el electrodo de retorno en
circuito con el tejido o los fluidos corporales, y un electrodo de
retorno de corona situado cerca del extremo distal y del electrodo
activo, estando conectado el electrodo de retorno de corona a la
fuente de energía eléctrica de alta frecuencia para establecer un
campo eléctrico con el electrodo activo, y el electrodo activo
puede también estar recubierto por un material dieléctrico.
El actual estado de la técnica no ha superado
completamente las dificultades asociadas con el cebado del plasma
en los sistemas quirúrgicos. Un aparato más simple y fiable para
encender el plasma hará posible que los sistemas basados en plasma
y, por tanto, los cirujanos, trabajen más eficazmente.
Más adelante se describe un aparato para encender
plasma dentro de un sistema quirúrgico. El presente invento es
definido en la reivindicación 1 más adelante. Las reivindicaciones
dependientes están dirigidas a características opcionales o
preferentes. Las ventajas que pueden observarse en esta descripción
incluyen una mayor fiabilidad y repetibilidad del cebado de plasma.
Esto representa un avance significativo con respecto al estado
actual de la técnica porque las técnicas actuales de cebado de
plasma requieren a menudo una manipulación difícil por parte del
cirujano o una electrónica complicada.
Una base de esta descripción es la creación y el
uso de dos tipos diferentes de descargas de plasma: una
"corona", y un "arco de plasma" Por arco de plasma se
indica la descarga de plasma que se usa con fines quirúrgicos sobre
el paciente. Una corona es una descarga de plasma de baja corriente
que ocurre alrededor de electrodos puntiagudos o de alambre en que
el campo eléctrico está muy elevado. Está asociado a veces con
pérdidas de la transmisión de energía eléctrica. Las referencias al
"cebado del plasma" se refieren al cebado del arco de plasma.
Un objetivo de esta descripción es generar y usar una corona para
que ayude al cebado del plasma.
Las descargas de gas funcionan con el principio
de ionización por avalancha de electrones de un gas de fondo 4. En
los sistemas quirúrgicos, el gas de fondo es habitualmente argón,
sin embargo también se sabe que son efectivos otros gases. El
proceso de ionización por avalancha de electrones comienza cuando
se aceleran electrones semilla en un campo eléctrico aplicado a
energías suficientes para ionizar un átomo de gas o molécula después
de la colisión. El resultado de la colisión es un anión y dos
electrones libres que están disponibles para ionizar dos átomos más
de gas que dan lugar a cuatro electrones libres, y así
sucesivamente.
El crecimiento de la densidad de electrones es
exponencial con respecto a la distancia recorrida por los
electrones semilla, y por tanto, se genera un plasma que es capaz
de conducir energía eléctrica. Este el principal mecanismo del
cebado del plasma. Los sistemas quirúrgicos hacen uso del plasma
para conducir energía electro-quirúrgica hasta el
tejido de un paciente sin tener que tocar el tejido con un
electrodo sólido. Se puede usar la energía
electro-quirúrgica para cortar, coagular, desecar, o
fulgurar la sangre o el tejido del paciente.
Esta descripción simplificada de la ionización
por avalancha de electrones no presta demasiada atención a los
mecanismos de pérdida de electrones. Antes del cebado del plasma,
el mecanismo primario de pérdida de electrones se hace a través de
la difusión de una única especie. La presencia de átomos
electronegativos o moléculas también es un mecanismo de pérdida. Se
requiere un campo eléctrico alto para superar estas pérdidas.
Después del cebado del plasma, la difusión se vuelve bipolar y la
tasa de pérdida de difusión de electrones se reduce de forma
significativa. Por consiguiente, una vez que se ha cebado el
plasma, un campo eléctrico inferior puede mantener el arco de
plasma.
En los sistemas quirúrgicos, esto significa que
el cirujano debe tener un campo eléctrico elevado para encender el
plasma. En determinados sistemas, el cirujano puede ver esto como
una necesidad para mover el electrodo activo cerca del tejido del
paciente, generando así un campo eléctrico elevado. El hueco entre
el electrodo activo y el tejido del paciente cuando finalmente se
enciende el plasma se denomina la "distancia de cebado". Una
vez que el plasma se ha cebado, el cirujano puede mantener al arco
a mayores distancias de trabajo que la distancia de cebado. Esto se
debe a que se necesita un campo eléctrico menor para mantener el
arco de plasma que el que se necesita para iniciarlo. Cuando se
aplica la baja potencia electro-quirúrgica, la
diferencia entre la distancia de cebado y la distancia de trabajo
puede ser de grande hasta de un orden de magnitud.
Otro factor que limita el cebado del plasma es la
disponibilidad de electrones semilla. Los electrones semilla pueden
aparecer accidental o irregularmente, por ejemplo a partir de rayos
cósmicos. Esto hace que el cebado del arco sea un hecho no seguro
incluso cuando el cirujano ha colocado el electrodo activo a una
distancia de cebado más adecuada.
A partir de esta descripción del mecanismo
subyacente en la formación de un plasma de gas, es evidente que una
fuerte de electrones libres facilitaría enormemente la ionización
por avalancha de electrones y el cebado del plasma. Podría
reducirse el campo eléctrico requerido para superar las pérdidas por
difusión, aumentando por tanto la distancia de cebado. La fuente de
electrones libres proporcionaría también los electrones semilla. El
plasma se encendería, por consiguiente, con mayor fiabilidad y
repetibilidad. Por consiguiente, una fuente de electrones libres
aumentaría la facilidad y efectividad de los procedimientos
quirúrgicos que requieren plasma.
Una corona es un tipo de descarga y, por tanto,
puede ser una fuente de electrones libres. La formación de una
corona alrededor de un electrodo activo de una herramienta
quirúrgica logrará los objetivos deseados de aumentar la distancia
de cebado y, por tanto, de aumentar la fiabilidad del cebado de
plasma. Debido a que las coronas son descargas de baja corriente,
consumen relativamente poca energía y, por tanto, sólo afectan
ligeramente a la energía que se aplica al paciente. El fenómeno de
corona ocurre sólo en campos eléctricos altamente
no-uniformes generados por electrodos activos y de
retorno de tamaños muy diversos.
Tales campos de electrodos pueden ser generados
por un sistema electro-quirúrgico mediante una
elección más adecuada de las formas y la colocación de los
electrodos. Por ejemplo, puede usarse una disposición coaxial de
los electrodos, en la cual el electrodo central es de mucho menor
diámetro que el electrodo exterior coaxial. Una disposición coaxial
es una realización posible del invento, aunque otras disposiciones
de los electrodos pueden producir también el campo eléctrico
requerido. Otra posible disposición podría tener un cable de malla
en el aplicador y conectada eléctricamente al potencial de
retorno.
Esta descripción enseña el uso de un tercer
electrodo que se denomina "electrodo de retorno de corona". El
electrodo de retorno de corona está situado sobre el aplicador
quirúrgico y está conectado eléctricamente al potencial de retorno
del generador electro-quirúrgico. El electrodo de
retorno de corona es distinto físicamente del electrodo de retorno
electro-quirúrgico, aunque ambos están eléctricamente conectados con el potencial de retorno del generador electro-quirúrgico. Se requiere una barrera dieléctrica para evitar la aparición del arco entre el electrodo activo y el electrodo de retorno de corona. También puede usarse la barrera dieléctrica para evitar la aparición del arco entre el electrodo activo y el electrodo de retorno de corona.
electro-quirúrgico, aunque ambos están eléctricamente conectados con el potencial de retorno del generador electro-quirúrgico. Se requiere una barrera dieléctrica para evitar la aparición del arco entre el electrodo activo y el electrodo de retorno de corona. También puede usarse la barrera dieléctrica para evitar la aparición del arco entre el electrodo activo y el electrodo de retorno de corona.
Se genera un campo eléctrico
no-uniforme entre el electrodo de retorno de corona
y el electrodo activo. Si es suficientemente alto, este campo
eléctrico hace que se forme una corona alrededor del electrodo
activo. Por consiguiente, la corona favorece el cebado del plasma.
Se produce la conducción de una corriente relativamente pequeña a
través del electrodo de retorno de corona. Esta corriente es, en
primer lugar, el resultado del acoplamiento capacitivo entre el
electrodo activo y el electrodo de retorno de corona.
Cuando un cirujano usa el sistema
electro-quirúrgico, la energía
electro-quirúrgica pasará a lo largo del electrodo
activo, a través del plasma, hasta el paciente, luego hasta el
electrodo de retorno electro-quirúrgico, y de
vuelta hasta el terminal de retorno del generador
electro-quirúrgico. En un sistema bipolar, el
electrodo de retorno electro-quirúrgico estará
situado sobre el aplicador y, por tanto, será necesario asegurar
que la energía electro-quirúrgica no forma un arco
directamente entre el plasma y el electrodo de retorno
electro-quirúrgico. Esto puede lograrse, bien
teniendo una barrera dieléctrica, o bien teniendo una distancia
ocupada por aire suficiente entre el plasma y el electrodo de
retorno electro-quirúrgico, o una combinación de
los dos.
La Figura 1 es un diagrama esquemático de un
sistema electro-quirúrgico monopolar con una fuente
de gas regulable y un aparato de ignición de plasma de gas.
La Figura 2 es un diagrama esquemático de un
sistema electro-quirúrgico monopolar con un aparato
de ignición de plasma de gas.
La Figura 3 es un diagrama esquemático que
muestra una vista desde un extremo, de un mango que se utiliza para
un sistema electro-quirúrgico monopolar.
La Figura 4 es un diagrama esquemático que
muestra el extremo distal de un mango utilizado que se utiliza para
un sistema electro-quirúrgico monopolar.
La Figura 5 es un diagrama esquemático que
muestra el extremo distal de un mango que se utiliza para un sistema
electro-quirúrgico bipolar.
A continuación se describirán algunas
realizaciones del aparato de cebado del plasma. La base del aparato
de cebado es la formación de una corona, que es un tipo de descarga
de plasma que es distinto del arco de plasma. En cada una de las
realizaciones se usa un electrodo de retorno en conexión con un
electrodo activo para crear un campo eléctrico
no-uniforme que conduzca a la formación de una
corona.
La primera realización del sistema 10 de ignición
de plasma, como se muestra en la Figura 1, puede usarse en sistemas
electro-quirúrgicos que tengan una fuente regulable
de gas ionizable 12. La primera realización comprende los
siguientes elementos: un mango 11, una fuente regulable de gas
ionizable 12, un paso para el gas 13 a través del mango, un
electrodo activo 14, un retorno eléctrico 15, una fuente de energía
eléctrica de alta frecuencia 16, un electrodo de retorno de corona
17, y un miembro dieléctrico 18. El mango o aplicador 11 es para
que el cirujano realice el control durante la aplicación del arco
de plasma 19. El mango 11 tiene un extremo distal 20 desde el cual
emana el arco 19 de plasma. El extremo distal 20 del mango 11 es
dirigido hacia la zona quirúrgica 21 por parte del cirujano. La
fuente regulable de gas ionizable 12 es, típicamente, un depósito a
presión 12 que tiene asociado un regulador de gas 22. El gas
ionizable 12 es típicamente argón, aunque se sabe que pueden
ionizarse y usarse otros gases, particularmente los gases nobles.
Hay un paso 13 a través del mango 11 conectado en el extremo
proximal 23a a la fuente regulada de gas ionizable 12, para que el
gas pueda fluir a través del mango 11 y fuera del mango 11 en un
extremo distal 20.
La fuente de energía eléctrica de alta frecuencia
16 es típicamente un generador electro-quirúrgico
tal como el Force 20, fabricado por ValleyLab, Inc.,
Boulder, Colorado, EE.UU. El generador electro-quirúrgico 16 tiene terminales eléctricos 23 y 24 de potenciales activo y de retorno. El electrodo activo 14 está conectado eléctricamente al terminal activo 23 del generador electro-quirúrgico 16. El electrodo activo 14 es colocado en el paso 13 a través del mango 11, para que el gas ionizable 12 fluya en contacto con el electrodo activo 14.
Boulder, Colorado, EE.UU. El generador electro-quirúrgico 16 tiene terminales eléctricos 23 y 24 de potenciales activo y de retorno. El electrodo activo 14 está conectado eléctricamente al terminal activo 23 del generador electro-quirúrgico 16. El electrodo activo 14 es colocado en el paso 13 a través del mango 11, para que el gas ionizable 12 fluya en contacto con el electrodo activo 14.
Hay una vía de retorno eléctrico 15 conectada a
la fuente de energía eléctrica de alta frecuencia 16, y también
está conectado con el tejido o fluidos corporales del paciente 25.
El retorno eléctrico 15 puede estar unido de forma separada al
paciente 25 en un sistema monopolar 26, como se muestra en la
Figura 4. Alternativamente, el retorno eléctrico 15 puede estar
sobre el mango 11 de un sistema bipolar o sesqui polar 27, como se
muestra en la Figura 5.
En cada realización, un electrodo de retorno de
corona 17 está sobre el mango 11 y situado cerca del extremo distal
20. El electrodo de retorno de corona 17 está conectado
eléctricamente a la vía de retorno 15 sobre el generador
electro-quirúrgico 16. La función del electrodo de
retorno de corona 17 es establecer un campo eléctrico
no-uniforme con el electrodo activo 14. El campo
eléctrico no-uniforme dará lugar a la formación de
una corona 28 cerca del electrodo activo 14, que contribuirá, por
tanto, al cebado de un plasma quirúrgico 19.
Un miembro dieléctrico 18 separa el electrodo
activo 14 del electrodo de corona 17. Habrá acoplamiento eléctrico
entre el electrodo activo 14 y el electrodo de retorno de corona
17, en que el acoplamiento es de una naturaleza esencialmente
capacitiva. Esto dará como resultado una corriente eléctrica en el
electrodo de retorno de corona 17, aunque la corriente será
típicamente pequeña comparada con la cantidad de corriente en el
retorno eléctrico 15, cuando el circuito se haya cerrado a través
del paciente. 25.
Otra realización del sistema de cebado del plasma
10, como se muestra en la Figura 2, puede usarse en sistemas
electro-quirúrgicos 29 que no tienen un suministro
regulado de gas ionizable. Estos sistemas 29 son requeridos para
ionizar el aire en la región entre el electrodo activo 14 y el
paciente 25, para conducir energía
electro-quirúrgica al paciente 25 sin contacto
físico del electrodo activo 14. Esta realización comprende los
siguientes elementos: un mango 11, un electrodo activo 14, un
retorno eléctrico 15, una fuente de energía eléctrica de alta
frecuencia 16, un electrodo de retorno de corona 17, y un miembro
dieléctrico 18. Está realización está diseñada para generar un campo
eléctrico no-uniforme entre el electrodo activo 14
y el electrodo de retorno de corona 17 para que se forme una corona
28 cerca del electrodo activo 14. La corona 28 contribuirá luego en
la ionización de la distancia ocupada por aire entre el electrodo
de retorno y el paciente 25.
Otra realización del sistema de cebado de plasma
10, como se muestra en la Figura 2, puede usarse en sistemas
electro-quirúrgicos 29 que no tengan un suministro
regulable de gas ionizable. Estos sistemas 29 son requeridos para
ionizar aire en la región entre el electrodo activo 14 y el paciente
25 para conducir energía electro-quirúrgica hasta
el paciente 25 sin contacto físico del electrodo activo 14. Esta
realización comprende los siguientes elementos: un mango 11, un
electrodo activo 14, un retorno eléctrico 17, y un miembro
dieléctrico 18. Está realización está diseñada para generar un campo
eléctrico no-uniforme entre el electrodo activo 14
y el electrodo de retorno de corona 17 para que se forme una corona
28 cerca del electrodo activo 14. La corona contribuirá, por tanto,
a la ionización del aire entre el electrodo activo 14 y el paciente
25.
Hay varias realizaciones posibles del electrodo
de retorno de corona 17. En una realización, como se muestra en la
Figura 3, el electrodo de retorno de corona 17 es una malla
conductora que está dispuesto sobre la superficie exterior del
miembro dieléctrico 18. En otra realización, como se muestra en la
Figura 4, el miembro dieléctrico es un tubo, y el electrodo de
retorno de corona 17 es un cilindro hueco delgado dispuesto sobre
el tubo 18. En otra realización más, el electrodo de retorno de
corona 17 es un depósito conductor sobre la superficie exterior del
miembro dieléctrico 18. En otra realización más, el electrodo de
retorno de corona 17 es una malla conductora embebida en el miembro
dieléctrico 18.
Los técnicos experimentados reconocerán que son
posibles numerosas realizaciones del electrodo de retorno de corona
17. El objetivo deseado es la producción de un campo eléctrico
no-uniforme que tenga suficiente fuerza para
generar una corona 28. La manipulación del tamaño, la forma, y la
colocación de los electrodos puede producir las características de
campo deseadas.
Se han presentado las descripciones siguientes de
las realizaciones del invento con el fin de ilustrar y describir.
No se pretende ser exhaustivos o limitar el invento a la forma
descrita precisa y, obviamente, son posibles muchas modificaciones
y variaciones a la vista de la presentación anterior. Se han
elegido y descrito las realizaciones para explicar mejor los
principios del invento y su aplicación práctica. Debe entenderse
que el invento puede ser portado por equipos y dispositivos
diferentes específicos, y que pueden realizarse varias
modificaciones, tanto de los detalles del equipo como de los
métodos de fabricación, sin salirse del alcance del propio
invento.
Claims (8)
1. Un aparato para producir una descarga de
corona para iniciar un arco de plasma (19) para ser aplicado por un
cirujano a un tejido o a fluidos corporales de un paciente (25),
comprendiendo el aparato:
un mango (11) para que el cirujano tenga el
control durante la aplicación del arco (19) de plasma, teniendo el
mango un extremo distal (20) para apuntar al paciente;
una fuente regulable de gas ionizable (12);
un paso a través del mango y que está conectado
en posición proximal a la fuente regulable de gas ionizable,
permitiendo que dicho gas ionizable pase a través del mango
(11);
un electrodo activo (14) en el paso que se
extiende desde el extremo distal y está en contacto con el gas
ionizable;
una fuente de energía eléctrica de alta
frecuencia (16) conectada al electrodo activo;
un electrodo de retorno
electro-quirúrgico (15) para hacer contacto con el
tejido o los fluidos corporales, pudiéndose conectar dicho electrodo
de retorno (15) a la fuente de energía eléctrica de alta
frecuencia;
un electrodo de retorno de corona (17) situado
cerca del extremo distal (20) y alrededor del electrodo activo (14),
estando conectado el electrodo de retorno de corona (17) a la
fuente de energía eléctrica de alta frecuencia para establecer un
campo eléctrico con el electrodo activo; y
un miembro dieléctrico (18) cerca del extremo
distal (20), estando el miembro dieléctrico entre el electrodo
activo (14) y el electrodo de retorno de corona (17), y entre el
gas ionizable y el electrodo de retorno de corona (17),
2. El aparato de la reivindicación 1, en que el
paso está formado por un tubo asociado con el mango y el electrodo
activo está básicamente centrado para que sea coaxial dentro de al
menos una parte del tubo.
3. El aparato de la reivindicación 2, en que el
electrodo de retorno de corona es un cilindro hueco delgado situado
coaxialmente sobre la superficie exterior del tubo.
4. El aparato de la reivindicación 2, en que el
tubo está hecho de material dieléctrico.
5. El aparato de la reivindicación 2, en que el
electrodo activo y el paso están dispuestos coaxialmente uno con
respecto al otro, en, al menos, una parte del tubo.
6. El aparato de la reivindicación 1, en que el
electrodo de retorno de corona está, al menos parcialmente, con la
forma de una malla conductora.
7. El aparato de la reivindicación 1, en que el
electrodo de retorno de corona está, al menos parcialmente, con la
forma de una hoja metálica conductora.
8. El aparato de la reivindicación 2, en que el
paso es un tubo asociado con el mango y el electrodo de retorno de
corona comprende un cable que va situado en el tubo.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US399682 | 1995-03-07 | ||
US08/399,682 US5669904A (en) | 1995-03-07 | 1995-03-07 | Surgical gas plasma ignition apparatus and method |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2214527T3 true ES2214527T3 (es) | 2004-09-16 |
Family
ID=23580554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES96902402T Expired - Lifetime ES2214527T3 (es) | 1995-03-07 | 1996-03-01 | Aparato quirurgico de encendido de plasma de gas. |
Country Status (8)
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---|---|
US (1) | US5669904A (es) |
EP (1) | EP0814712B1 (es) |
JP (1) | JPH10503410A (es) |
AU (1) | AU4673996A (es) |
CA (1) | CA2213472A1 (es) |
DE (1) | DE69631585T2 (es) |
ES (1) | ES2214527T3 (es) |
WO (1) | WO1996027337A1 (es) |
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- 1995-03-07 US US08/399,682 patent/US5669904A/en not_active Expired - Lifetime
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1996
- 1996-03-01 EP EP96902402A patent/EP0814712B1/en not_active Expired - Lifetime
- 1996-03-01 ES ES96902402T patent/ES2214527T3/es not_active Expired - Lifetime
- 1996-03-01 CA CA002213472A patent/CA2213472A1/en not_active Abandoned
- 1996-03-01 JP JP8526735A patent/JPH10503410A/ja active Pending
- 1996-03-01 WO PCT/IB1996/000158 patent/WO1996027337A1/en active IP Right Grant
- 1996-03-01 AU AU46739/96A patent/AU4673996A/en not_active Abandoned
- 1996-03-01 DE DE69631585T patent/DE69631585T2/de not_active Expired - Lifetime
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US5669904A (en) | 1997-09-23 |
CA2213472A1 (en) | 1996-09-12 |
AU4673996A (en) | 1996-09-23 |
JPH10503410A (ja) | 1998-03-31 |
EP0814712B1 (en) | 2004-02-18 |
DE69631585D1 (de) | 2004-03-25 |
EP0814712A1 (en) | 1998-01-07 |
DE69631585T2 (de) | 2004-12-16 |
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