ES2386159T3 - Fórceps electroquirúrgicos con placas para cerrar herméticamente de cierre lento - Google Patents
Fórceps electroquirúrgicos con placas para cerrar herméticamente de cierre lento Download PDFInfo
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Abstract
Fórceps bipolar electroquirurgico (10) para cerrar hermeticamente tejido, que comprende como minimo un miembro (12) de eje que tiene un conjunto (100) de efector de extremo dispuesto en un extremo distal del mismo, cuyo conjunto (100) de efector de extremo incluye unos miembros de mordaza (110, 120) que se pueden mover desde una primera posición en relación de separación uno con respecto al otro hasta como minimo una posición subsiguiente en donde los miembros de mordaza (110, 120) cooperan para agarrar tejido entre los mismos, en donde cada uno de los miembros de mordaza (110, 120) incluye una placa de cierre hermetico (112, 122) que comunica energia electroquirurgica a traves del tejido sujeto entre los mismos, al menos una de las placas de cierre hermetico (112, 122) incluyendo como minimo un miembro de tope (150), configurado para sobresalir una distancia fija de la placa de cierre hermetico para separar las placas de cierre hermetico (112, 122) en una distancia de intersticio predeterminada (G), comprendiendo ademas cada uno de los miembros de mordaza (110, 120) un alojamiento aislante (116, 126) de mordaza configurado para soportar la respectiva placa de cierre hermetico tiempo (112, 122), caracterizado por que como minimo una de las placas de cierre hermetico (112, 122) incluye al menos un resorte (149a, 149b) y porque el como minimo un resorte (149a) permite que la como minimo una placa de cierre hermetico (112, 122) se flexione lentamente para acomodarse a la presión aplicada al tejido hasta que se obtenga una presión de cierre especificada basandose en como minimo uno del tipo de tejido y del espesor de tejido, en donde el como minimo un resorte (149a) esta montado entre la al menos una de las placas de cierre hermetico (112, 122) y el alojamiento respectivo aislante de mordaza (116, 126).
Description
F6rceps electroquirurgicos con placas para cerrar hermeticamente de cierre lento
Campo de la invenci6n
La presente invenci6n se refiere a un f6rceps bipolar electroquirurgico para cerrar hermeticamente tejido.
Antecedentes de la tecnica anterior
Un f6rceps es un instrumento parecido a unos alicates que se basa en la acci6n mecanica entre sus mordazas para agarrar, abrazar y constrenirse a vasos o tejido. Los denominados "f6rceps abiertos" se usan comunmente en las intervenciones quirurgicas abiertas en las que, como el nombre implica, se usan "f6rceps endosc6picos" o "f6rceps laparosc6picos" para intervenciones quirurgicas endosc6picas menos invasivas. Los f6rceps electroquirurgicos (abiertos o endosc6picos) utilizan las acciones de fijaci6n mecanica y la energia electrica para efectuar la hemostasia sobre el tejido abrazado. Los f6rceps incluyen unas placas de cierre hermetico electroquirurgicas que aplican la energia electroquirurgica al tejido abrazado. Mediante el control de la intensidad, frecuencia y duraci6n de la energia electroquirurgica aplicada a traves de las placas de cierre hermetico al tejido, el cirujano puede coagular, cauterizar o cerrar hermeticamente el tejido.
El cierre hermetico de tejidos o vasos es un proceso de licuefacci6n del colageno, la elastina y las sustancias basicas contenidas en el tejido de tal manera que se reconformen en una masa fundida con una demarcaci6n significativamente reducida entre las estructuras opuestas de tejido. La cauterizaci6n implica el uso de calor para destruir tejidos, y la coagulaci6n es un proceso de desecar el tejido en el que las celulas del tejido se rompen y se secan.
Como los procedimientos de cierre hermetico de tejido implican mas que simplemente cauterizar el tejido, para crear un cierre hermetico eficaz los procedimientos implican un control preciso de una variedad de factores. Con el fin de efectuar un cierre hermetico adecuado en los vasos del tejido, se ha determinado que se deben controlar con precisi6n dos parametros mecanicos predominantes: la presi6n aplicada al tejido, y la distancia del intersticio entre los electrodos, (es decir, la distancia entre los miembros de mordazas opuestos cuando se cierren alrededor del tejido).
En epocas anteriores se han propuesto numerosos instrumentos electroquirurgicos para diversas intervenciones quirurgicas abiertas y endosc6picas. Sin embargo, la mayoria de estos instrumentos cauterizan o coagulan tejido y no estan disenados para crear un cierre hermetico eficaz o uniforme.
Ademas, muchos de los instrumentos de la tecnica anterior incluyen miembros de cuchillas o miembros de cizalladura que simplemente cortan tejido de una manera mecanica o electromecanica y son relativamente ineficaces para fines de cierre hermetico de vasos o tejidos. Otros instrumentos se basan generalmente en la presi6n de fijaci6n unicamente para procurar un espesor de cierre hermetico apropiado y a menudo no se han disenado para tener en cuenta tolerancias de espacios intermedios o de paralelismo y requisitos de planitud que son parametros que, si se controlan apropiadamente, pueden asegurar un cierre hermetico coherente y eficaz de tejidos. Por tanto, existe una necesidad para desarrollar un instrumento electroquirurgico que cierre hermeticamente el tejido de un modo eficaz y coherente.
Sumario de la invenci6n
Segun la presente invenci6n, se provee un f6rceps bipolar electroquirurgico para cerrar hermeticamente tejido, que comprende al menos un miembro de eje que tiene un conjunto de efector de extremo dispuesto en un extremo distal del mismo, cuyo conjunto de efector de extremo incluye unos miembros de mordaza m6viles desde una primera posici6n en relaci6n de separaci6n uno con respecto a otro hasta una posici6n subsiguiente en la que los miembros de mordaza cooperan para agarrar tejido entre los mismos, en donde cada uno de los miembros de mordaza incluye una placa de cierre hermetico que comunica energia electroquirurgica a traves del tejido sujeto entre las mismas, incluyendo al menos una de las placas de cierre hermetico como minimo un miembro de tope configurado para sobresalir una distancia fija de la placa de cierre hermetico con el fin de separar las placas de cierre hermetico por una distancia de intersticio predeterminada, cada uno de cuyos miembros de mordaza comprende ademas uno alojamiento aislante de mordaza configurado para soportar la respectiva placa de cierre hermetico, caracterizado porque al menos una de las placas de cierre hermetico incluye como minimo un resorte y porque el como minimo un resorte permite que la placa de cierre hermetico se flexione lentamente para acomodarse a la presi6n aplicada al tejido hasta que se obtenga una presi6n de cierre especificada basada en como minimo uno de entre el tipo y el espesor del tejido, en donde el como minimo un resorte esta montado entre al menos una de las placas de cierre hermetico y el respectivo alojamiento aislante de mordaza.
Breve descripci6n de los dibujos.
Para una mejor comprensi6n de la invenci6n y para mostrar c6mo se puede llevar a efecto la misma, a continuaci6n se hace referencia, s6lo a titulo de ejemplo, a los siguientes dibujos, en los que:
La Figura 1A es una vista en perspectiva de una realizaci6n de un f6rceps bipolar endosc6pico que esta configurado para cerrarse a un ritmo determinado segun la presente invenci6n;
La Figura 1 B es una vista interna parcial lateral de una realizaci6n de un f6rceps endosc6pico que muestra un conjunto de miembro de tope ajustable selectivamente segun la presente invenci6n;
La Figura 1 C es una vista a escala ampliada del area de detalle de la Figura 1 B;
La Figura 2 es una vista interna parcial lateral de un conjunto de efector de extremo mostrado en la configuraci6n cerrada;
La Figura 3 es una vista en perspectiva posterior del efector de extremo de la Figura 2 mostrado con tejido agarrado en el mismo;.
La Figura 4 es una vista en perspectiva a escala ampliada de una placa de cierre hermetico electricamente conductora del conjunto de efector de extremo mostrando una serie de miembros de tope ajustables selectivamente dispuestos en la misma;
La Figura 5 muestra un diagrama de flujo que presenta un metodo de cierre hermetico que usa el f6rceps bipolar endosc6pico de las Figuras 1A-4;
La Figura 6 muestra un grafico que ilustra los cambios que ocurren al colageno durante el cierre hermetico utilizando el metodo mostrado en la Figura 5;
La Figura 7 es una vista interna parcial lateral de un conjunto de efector de extremo que incluye un mecanismo de resorte de cierre lento en configuraci6n cerrada; y
La Figura 8 es una vista en perspectiva de una realizaci6n de un f6rceps bipolar abierto que esta configurado para cerrarse a un ritmo predeterminado segun la presente invenci6n.
Descripci6n detallada.
A continuaci6n se describen realizaciones particulares de la presente invenci6n con referencia a los dibujos adjuntos. En la descripci6n siguiente, no se describen con detalle funciones o construcciones bien conocidas para evitar oscurecer la presente invenci6n con detalles innecesarios.
Se divulga un f6rceps electroquirurgico que esta configurado para tener unas placas de cierre hermetico disenadas para cerrarse a un ritmo predeterminado basado en un cierre inducido automaticamente o manualmente. Se describe y divulga tambien en la presente memoria un metodo para controlar o regular las placas de cierre hermetico para que se cierren a un ritmo de cierre seleccionado o predeterminado.
La presente divulgaci6n se refiere a un instrumento de cierre hermetico de vasos o tejidos que se ha disenado para manipular, agarrar y cerrar hermeticamente tejido utilizando unos miembros de mordazas que estan configurados para cerrarse alrededor del tejido a un ritmo predeterminado, bien fijado automaticamente o bien inducido manualmente, que se contempla para producir un cierre hermetico de tejido de gran eficacia El ritmo de cierre es particularmente importante y util, puesto que se ha determinado que afecta a la cantidad de colageno que se licua durante el proceso de cierre hermetico de tejido, que a su vez se ha calculado que esta directamente relacionado con la calidad de cierre hermetico del tejido. De ese modo, la presente divulgaci6n se refiere a diversos sistemas y metodos mecanicos, electromecanicos y electricos que controlan a los miembros de mordaza de tal manera que las placas de cierre hermetico electricamente conductoras se cierren a un ritmo predeterminado para retener tanto colageno como sea posible en la zona de cierre hermetico durante el cierre hermetico. Dicho de un modo mas simple, si el ritmo de cierre es demasiado rapido, el colageno no podria ser impulsado fuera de la zona de cierre de hermetico, resultando en un cierre hermetico total mas debil. Si el ritmo de cierre es demasiado lento, entonces el tejido que se esta cerrando hermeticamente se podria arrugar y perder suficiente contacto con el f6rceps electroquirurgico, resultando tambien posiblemente en un cierre hermetico mas debil.
Una realizaci6n segun la presente divulgaci6n se refiere a un f6rceps bipolar electroquirurgico para cerrar hermeticamente tejido que incluye uno o mas miembros de eje con un conjunto de efector de extremo dispuesto en un extremo distal del eje (o ejes). El conjunto de efector de extremo incluye unos miembros de mordaza que se pueden mover desde una posici6n abierta hasta una posici6n cerrada y, cuando estan cerrados, los miembros de mordaza cooperan para agarrar tejido. Adicionalmente, cada uno de los miembros de mordaza incluye una placa de cierre hermetico para transferir energia electroquirurgica a traves del tejido agarrado por los miembros de mordaza. Las placas de cierre hermetico incluyen uno o mas miembros de tope ajustables que separan las placas de cierre hermetico por una distancia de intersticio predeterminada. Los miembros de tope ajustables se conectan tambien a uno o mas controladores que ajustan al miembro (o miembros) ajustable para cerrar las placas de cierre de hermetico a un ritmo predeterminado.
La presente divulgaci6n se refiere tambien a un metodo para cerrar el tejido e incluye la etapa inicial de proveer un f6rceps bipolar electroquirurgico que incluye uno o mas miembros de eje con un conjunto de efector de extremo dispuesto en un extremo distal del eje o ejes. El conjunto de efector de extremo incluye unos miembros de mordaza que se pueden mover desde una posici6n abierta hasta una posici6n cerrada y, cuando estan cerrados, los miembros de mordaza cooperan para agarrar tejidos. Adicionalmente, cada uno de los miembros de mordaza incluye una placa de cierre hermetico para transferir energia electroquirurgica a traves del tejido agarrado por los miembros de mordaza. Las placas de cierre hermetico incluyen uno o mas miembros de tope ajustables que separan las placas de cierre hermetico con una distancia de intersticio predeterminada. Los miembros de tope ajustables estan conectados tambien a uno o mas controladores que ajustan a los miembros de tope ajustables para cerrar las placas de cierre hermetico a un ritmo predeterminado. Otras etapas incluyen extender el miembro (o los miembros) de tope ajustable para ajustar la distancia de intersticio basandose en uno o mas parametros pre -quirurgicos y activar a los miembros de mordaza para agarrar tejido entre las placas de cierre hermetico. La etapa final incluye retirar al miembro (o miembros) de tope ajustable al ritmo predeterminado basandose en uno o mas parametros para cerrar las placas de cierre hermetico alrededor del tejido al mismo tiempo que simultaneamente conducir energia a la placa de cierre hermetico a traves del tejido para efectuar un cierre hermetico del tejido.
En una realizaci6n util particular, el f6rceps electroquirurgico incluye al menos un miembro de tope ajustable selectivamente (automatico o manual) que controla la distancia entre las placas de cierre hermetico.
Mas particularmente, y con referencia especifica a las figuras, la Figura 1A muestra un f6rceps bipolar endosc6pico de cierre hermetico de vaso 10. Los expertos en la tecnica entenderan que la invenci6n segun la presente divulgaci6n se podria adaptar para uso o bien con un instrumento endosc6pico o bien como un instrumento abierto. Debe hacerse notar tambien que las diferentes conexiones electricas y mecanicas y otras consideraciones se aplicaran a cada tipo particular de instrumento; sin embargo, los aspectos novedosos con respecto a la placa de cierre hermetico configuradas para cerrarse a un ritmo de cierre de predeterminado, bien configurado automaticamente o bien manualmente (que de ahora en adelante se denominaran "placas de cierre hermetico lento"), y sus caracteristicas operativas permanecen generalmente coherentes con respecto a tanto los disenos abiertos como a los endosc6picos.
El f6rceps 10 se ha mostrado a titulo de ejemplo, y se contemplan tambien otros f6rceps electroquirurgicos que perrmiten placas de cierre hermetico lento de la presente divulgaci6n. En los dibujos y en la descripci6n que sigue, el termino "proximal" se refiere al extremo del f6rceps 10 que esta mas cerca del usuario, mientras que el termino "distal" se refiere al extremo del f6rceps que esta mas lejos del usuario.
Las Figuras 1A-1C muestran el f6rceps 10 que esta configurado para soportar un conjunto de efector 100. Mas particularmente, el f6rceps 10 incluye generalmente un alojamiento 20, un conjunto de empunadura 30, un conjunto rotatorio 80, y un conjunto de gatillo 70 que cooperan mutuamente con el conjunto de efector 100 para agarrar, cerrar hermeticamente y, si se requiere, dividir el tejido. El f6rceps 10 incluye tambien un eje 12 que tiene un extremo distal 14 que se acopla mecanicamente al conjunto 100 de efector de extremo y un extremo proximal 16 que se acopla mecanicamente al alojamiento 20 en un lugar pr6ximo al conjunto rotatorio 80.
El f6rceps 10 incluye tambien un enchufe macho (no mostrado) que conecta el f6rceps 10 a una fuente de energia electroquirurgica, por ejemplo un generador electroquirurgico 500, a traves de un cable electrico 310 (vease Figura 2). El conjunto de empunadura 30 incluye una empunadura fija 50 y una empunadura m6vil 40. La empunadura 40 se mueve con respecto a la empunadura fija 50 para activar al conjunto de efector de extremo 100 y permitir que un usuario agarre y manipule el tejido 400 segun se ha mostrado en la Figura 3.
El conjunto 100 de efector de extremo incluye un par de miembros opuestos de mordaza 110 y 120 cada uno de los cuales tiene una placa de cierre hermetico electricamente conductora 111 y 112, respectivamente, fijadas al mismo para conducir energia electroquirurgica a traves del tejido 400 sujeto entre las mismas. Mas particularmente, los miembros de mordaza 110 y 120 se mueven en respuesta al movimiento de la empunadura 40 desde una posici6n abierta hasta una posici6n cerrada. En la posici6n abierta, las placas de cierre hermetico 112 y 122 estan dispuestas en una relaci6n de separaci6n una con la otra. En una posici6n de fijaci6n o cerrada, las placas de cierre hermetico 112 y 122 cooperan para agarrar tejido y aplicar energia electroquirurgica al mismo.
Los miembros de mordaza 110 120 se activan usando un conjunto de impulsi6n (no mostrado) encerrado dentro del alojamiento 20. El conjunto de impulsi6n coopera con la empunadura m6vil 40 para impartir el movimiento de los miembros de mordaza 110 y 120 desde la posici6n abierta hasta la posici6n de fijaci6n o cerrada. Ejemplos de conjuntos de empunadura se muestran y describen en la solicitud de patente de EE.U.U. de propiedad comun con numero de serie 10/369.894 (US 2003/0229344 a1) titulada "SELLADOR Y DIVISOR DE VASOS Y METODO DE FABRICACION DEL MISMO" y en la solicitud de patente de EE.UU.de propiedad comun con numero de serie 10/460.926 (US 2004/0254573 A1) titulada "SELLADOR Y DIVISOR DE VASOS PARA USO CON PEQUENOS TROCARS Y CANULAS)..
Adicionalmente, el conjunto de empunadura 30 de esta divulgaci6n particular incluye una articulaci6n mecanica de cuatro barras que proporciona una unica ventaja mecanica cuando se cierra hermeticamente tejido entre los miembros de mordaza 110 y 120. Por ejemplo, una vez que se ha determinado la posici6n prevista para la zona de
cierre hermetico y que los miembros de mordaza 110 120 se han situado adecuadamente, se puede comprimir totalmente la empunadura 40 para bloquear a las placas de cierre hermetico electricamente conductoras 112 y 122 en una posici6n cerrada contra el tejido. Los detalles referentes a las relaciones de inter cooperaci6n de los componentes de trabajo internos del f6rceps 10 se divulgan en la solicitud de patente de E.E.UU. de propiedad comun anteriormente citada con numero de serie 10/369.894.Otro ejemplo de un conjunto endosc6pico de empunadura que divulga un conjunto descentrado de empunadura parecido a una palanca se divulga en la solicitud de patente de EE.UU. anteriormente citada con numero de serie 10/460.926..
Como se muestra en las Figuras 1 A-1C, el f6rceps 10 incluye tambien un gatillo 70 que hace avanzar a un bisturi 200 dispuesto dentro del conjunto 100 de efector de extremo. Una vez que se ha formado un cierre hermetico de tejido, el usuario activa al gatillo 70 para separar el tejido 400 a lo largo del cierre hermetico de tejido. El bisturi 200 incluye previamente un borde afilado 205 para cortar el tejido 400 sujeto entre los miembros de mordaza 110 y 120 en la zona de cierre hermetico del tejido. La Figura 4 muestra un canal orientado longitudinalmente 210 definido en una placa de cierre hermetico 112 electricamente conductora que se extiende desde el extremo proximal al extremo distal del mismo. El canal 210 facilita el movimiento alternativo longitudinal del bisturi 200 a lo largo de un plano de corte preferido para separar de forma eficaz y precisa al tejido 400 a lo largo de un cierre hermetico formado de tejido.
El f6rceps 10 incluye tambien un conjunto rotatorio 80 mecanicamente en relaci6n de asociaci6n con el eje 12 y el conjunto de impulsi6n (no mostrado). El movimiento del conjunto rotatorio 80 imparte un movimiento de rotaci6n similar al eje 12 el cual, a su vez, hace rotar al conjunto 100 de efector de extremo. Diversas caracteristicas junto con diversas configuraciones electricas para la transferencia de energia electroquirurgica a traves del conjunto de empunadura 20 y del conjunto rotatorio 60 se describen con mas detalle en las solicitudes de patente de EE.UU. de propiedad comun anteriormente mencionadas numeros 10/369.894 y 10/460.926.
Como se ve mejor con respecto a las Figuras 1A-2, el conjunto 100 de efector de extremo se fija al extremo distal 14 del eje 12. Los miembros de mordaza 110 y 120 son preferiblemente pivotables alrededor de un pivote 160 desde las posiciones abierta a cerrada tras un movimiento de vaiven relativo, es decir, un movimiento longitudinal, del conjunto de impulsi6n (no mostrado). De nuevo en este caso, las relaciones mecanicas y de cooperaci6n con respecto a los diversos elementos m6viles del conjunto 100 de efector de extremo se describen adicionalmente por ejemplo con respecto a las solicitudes de patente de EE.UU. de propiedad comun anteriormente mencionadas numeros 10/369.894 y 10/460.926..
Se contempla que el f6rceps 10 se podria disenar de tal manera que sea total o parcialmente desechable dependiendo de un objetivo particular o para lograr un resultado particular. Por ejemplo, el conjunto 100 de efector de extremo se podria acoplar selectiva y liberablemente con el extremo distal 14 del eje 12 o el extremo proximal 16 del eje 12 se podria acoplar selectiva o liberablemente con el alojamiento 20 y el conjunto de empunadura 30. En cualquiera de estos casos, el f6rceps 10 podria o bien ser parcialmente desechable o reposable, tal como cuando se usan en un conjunto de efector de extremo nuevo o diferente o un conjunto 100 de efector de extremo y un eje 12 para reemplazar selectivamente a un antiguo conjunto 100 de efector de extremo segun sea necesario.
Dado que el f6rceps 10 aplica energia a traves de electrodos, cada uno de los miembros de mordaza 110 y 120 incluye una placa de cierre hermetico electricamente conductora 112 y 122, dispuestas en la superficie que mira hacia adentro de la misma. De ese modo, una vez que los miembros de mordaza de 110 y 120 se han comprimido plenamente sobre el tejido 400, el f6rceps 10 esta ahora listo para la aplicaci6n selectiva de energia electroquirurgica como se muestra en la Figura 3. En ese momento, las placas electricamente conductoras 112 y 122 cooperan para cerrar hermeticamente el tejido 400 sujeto entre las mismas tras la aplicaci6n de energia electroquirurgica.. Los miembros de mordaza 110 y 120 incluyen tambien unos aisladores 116 y 126 que junto con las placas no conductoras exteriores de los miembros de mordaza 110 y 120 se han configurado para limitar o reducir muchos de los efectos inconvenientes conocidos relacionados con el cierre hermetico de tejidos, por ejemplo, la descarga disruptiva, la dispersi6n termica y la disipaci6n de corrientes parasitas como se muestra en la Figura 1C.
De particular importancia para esta divulgaci6n es el sistema de cierre lento que permite que el intersticio "G" dispuesto entre las placas de cierre hermetico cuando los miembros de mordaza estan dispuestos en una posici6n cerrada se cierre a un ritmo predeterminado. Esto se ha determinado para aumentar el cierre hermetico del tejido especialmente cuando se cierren hermeticamente grandes estructuras de tejido por ejemplo pulm6n, higado, intestino, bronquios, etcetera. Una tecnica quirurgica de activaci6n de cierre lento implica activar el instrumento quirurgico y despues cerrar lentamente las placas de cierre hermetico 112 y 122 de los miembros de mordaza para agarrar y aplicar presi6n al tejido con el fin de efectuar el cierre hermetico. Como puede apreciarse, este tipo de intervenci6n es muy dificil de gobernar manualmente debido a las muchas variables implicadas con el proceso de cierre hermetico y, como resultado, el instrumento puede ser corto o el ciclo de cierre hermetico se podria completar antes de obtener la posici6n de trinquete plenamente cerrada. Por tanto, se prefiere que el procedimiento sea automatice usando una serie de sensores y controladores. Se contempla que un sistema de ajuste automatico del miembro del tope (descrito mas adelante) es una manera de conseguir la activaci6n de un cierre lento y de proporcionar un cierre hermetico mas eficaz de grandes estructuras de tejido. El ritmo de cierre se podria ajustar durante la activaci6n basandose en una condici6n quirurgica detectada continuamente (por ejemplo, la impedancia
del tejido, tipo de tejido, claridad del tejido, cumplimiento del tejido etc.) utilizando un bucle de control de realimentaci6n o una fuente de control 300, y un conjunto de sensores 170a y 170b y un conjunto 140 del miembro de tope mecanicamente retirable o extensible.
Con respecto a esta realizaci6n particular, es sabido que el cierre hermetico del tejido 400 se realiza en virtud de una combinaci6n unica de control de intersticio, presi6n y control electrico. En otras palabras, el control de la intensidad, frecuencia y duraci6n de la energia electroquirurgica aplicada al tejido a traves de la placas 112 y 122 de cierre hermetico son consideraciones electricas importantes para cerrar hermeticamente el tejido. Adicionalmente, dos factores mecanicos juegan un papel importante en la determinaci6n del espesor resultante del tejido cerrado hermeticamente y de la eficacia del cierre hermetico, a saber, la presi6n aplicada entre los miembros opuestos de mordaza 110 y 120 (entre alrededor de 3 �g/cm2 hasta aproximadamente 16 �g/cm2) y la distancia de intersticio "G" entre las placas de cierre hermetico opuestas 112 y 122 de los miembros de mordaza 110 y 120, respectivamente, durante el proceso de cierre hermetico (entre aproximadamente 0.003 cm (unas 0,001 pulgadas) o mas, dependiendo del tamano del tejido. Se ha descubierto recientemente un tercer factor mecanico que contribuye a la calidad y consistencia de un cierre hermetico de tejido, a saber. el ritmo de cierre de las superficies electricamente conductoras o placas de cierre hermetico durante la activaci6n.
Mas particularmente, el control de la distancia del intersticio "G" entre las superficies opuestas de cierre hermetico 112 y 122 directamente esta relacionado con el ritmo de cierre, es decir, el ritmo de cierre se define como la tasa de cambio de la distancia del intersticio "G". Por tanto, el ajuste de la distancia del intersticio "G" permite al usuario ajustar el ritmo de cierre. Segun se describe con mas detalle mas adelante, el f6rceps 10 segun la presente divulgaci6n controla la distancia del intersticio "G" usando una tecnica que permite a un usuario ajustar selectivamente (es decir, a mano, o automaticamente basandose en condiciones quirurgicas detectadas o en parametros predeterminados) la retirada o la extensi6n de al menos un miembro de tope 150 con respecto a la superficie de la placa de cierre hermetico, por ejemplo, la 112. Como resultado de lo mismo, el ajuste del miembro de tope 150 controla el ritmo de cierre lo cual, a su vez, permite a un cirujano implementar una intervenci6n quirurgica de cierre lento usando el f6rceps 10.
Mas especificamente, el ritmo de cierre de las placas de cierre hermetico 112 y 122 para agarrar o aplicar presi6n al tejido se regula mediante el ajuste de la distancia del intersticio "G" durante la intervenci6n quirurgica. . En un caso particular, los miembros de tope 150 se conectan a un controlador 155 que conjuntamente comprende una unidad de control 145 de miembro de tope ajustable selectivamente. Cada una de las unidades de control 145 de miembro de tope esta conectada al conjunto 140 de miembro de tope que regula la distancia del intersticio "G" mediante la extensi6n o retirada de una pluralidad de miembros de tope 150 basandose en las senales de control recibidas de la fuente de control 300 y en las senales de realimentaci6n transmitidas por un conjunto de sensores 170a y 170b. El controlador 155 de una forma electrica, mecanica o electromecanica ajusta la distancia que los miembros de tope 150 sobresalen mediante la retirada o la extensi6n de los miembros de tope 150 de la placa de cierre hermetico 112. Como resultado, la distancia de intersticio "G" se ajusta cambiando la distancia que los miembros de tope 150 sobresalen de la placa de cierre hermetico 112. El controlador 155 esta destinado a recibir las senales de una fuente de control 300 mostrada en la Figura 2 que se podria fijar a un generador electroquirurgico 500 o incorporarse al alojamiento del f6rceps 10.
Como se ha indicado anteriormente, el miembro de tope 150 limita el movimiento de los dos miembros opuestos de mordaza 110 y 120 (y de las placas de cierre hermetico 112 y 122) unos con respecto a otros actuando como una barrera entre las dos superficies. Se contempla que los miembros de tope 150 podrian disponerse en una o en ambas placas de cierre hermetico 112 y 122 dependiendo de un objetivo particular o para conseguir un resultado particular. Preferiblemente, los miembros de tope 150 se extienden desde como minimo una de las placas de cierre hermetico 112,122 en una distancia predeterminada de acuerdo con las propiedades especificas del material del miembro del tope 150 (por ejemplo, resistencia a la compresi6n, dilataci6n termica, etc). Para obtener una distancia coherente y precisa de intersticio "G" durante el cierre hermetico.
Con el fin de que los miembros de tope 150 impidan que las placas de cierre hermetico 112 122 entren en contacto entre si, preferiblemente, los miembros de tope 150 se construyen de un material aislante, por ejemplo parileno, nailon o un material ceramico y se dimensionan para limitar el movimiento en oposici6n de las placas de cierre hermetico 112 y 122 hasta dentro del intervalo de intersticio "G" antes mencionado. Sin embargo, se deberia considerar la resistencia a la compresi6n del material usado en la fabricaci6n del miembro del tope 150 durante la activaci6n, porque un material podria tener que ajustarse diferentemente de otro material para conseguir la misma distancia de intersticio "G". Por ejemplo, la resistencia a la compresi6n del nailon es diferente de la del material ceramico y, por tanto, el material de nailon podria tener que extenderse una distancia mayor desde la placa de cierre hermetico 112 para contrarrestar la fuerza de cierre de los miembros opuestos de mordaza 110 y 120 y para conseguir la misma distancia prevista de intersticio "G". Como puede apreciarse, estas consideraciones se podrian regular o controlar automaticamente en la fuente de control 300 por medio de un algoritmo de ordenador o de una tabla de consulta segun se expone con mas detalle mas adelante.
Ademas, se contempla que se podia armar cualquier combinaci6n de diferentes miembros de tope 150 a lo largo de las placas de cierre hermetico 112 o 122 para obtener una distancia prevista de intersticio "G". Se podria depositar o rociar un revestimiento ceramico o aislante sobre la placa de acoplamiento de tejido del miembro del tope 150. Se
contemplan tecnicas de rociado termico que impliquen depositar una amplia gama de materiales aislantes y resistentes al calor sobre la placa de acoplamiento de tejido de los miembros de tope 150, dep6sito de oxigeno y combustible a gran velocidad, dep6sito de plasma, etcetera. Ejemplos de miembros de tope 150, unidad de control 125, y conjuntos de miembro de tope 140 se muestran y describen reciben en una solicitud de patente de EE.UU. de propiedad comun con numero de serie 10/846.262 (US 2005/0021027 A1) titulada "SELLADOR DE TE�IDO CON MIEMBROS DE TOPE VARIABLES NO CONDUCTORES Y METODO DE CERRAR �ERMETICAMENTE TE�IDO"
La Figura 4 muestra una configuraci6n ejemplar de los miembros de tope 150 dispuestos sobre -o sobresaliendo de -la placa de cierre hermetico 112. Se contempla que los miembros de tope 150 se pueden situar en cualquiera de los dos o en ambos miembros de mordaza 110 y 20 dependiendo de un objetivo particular, o para conseguir un resultado previsto. Mas particularmente y como se ilustra en la Figura 4, una serie de miembros de tope 150 parecidos a leng�etas y orientados longitudinalmente estan dispuestos a lo largo de cualquiera de los dos lados del canal 210 de bisturi del miembro de mordaza 110. Preferiblemente, los miembros de tope 150 se podrian configurar en cualquier configuraci6n geometrica o polin6mica conocidas como por ejemplo, triangular, rectilinea, circular, ovoide, festoneada, etc., . dependiendo de un objetivo particular.
Como se muestra en las Figuras 1B y 1C, el conjunto 140 de miembros de tope selectivamente ajustable esta situado dentro de como minimo uno de los miembros de mordaza 110 a 120. Mas particularmente, como minimo uno de los miembros de mordaza, por ejemplo el miembro de mordaza 110, incluye una cavidad 130 practicada en el mismo que se ha dimensionado para alojar al conjunto 140 de miembros de tope. El conjunto 140 de miembros de tope ajusta la distancia que cada miembro de tope 150 se extiende desde la placa de cierre hermetico 112 usando el controlador 155, que coopera con el miembro de tope 150 en una pluralidad de modalidades. Por ejemplo, cada miembro de tope 150 y su correspondiente controlador 155 se podrian conectar de forma roscada de tal manera que el controlador 155 "desenrosque" al miembro de tope 150 para ajustar la distancia que el miembro de tope 150 se extiende desde la placa de cierre hermetico 112. Se contemplan tambien otros sistemas mecanicos para permitir la regulaci6n selectiva de la distancia de intersticio "G", (por ejemplo mecanismos de engranajes, mecanismos de levas, mecanismos neumaticos, mecanismos hidraulicos, etc).
Se contemplan tambien sistemas electromecanicos (por ejemplo, dispositivos de accionamiento electromecanicos, dispositivos de accionamiento ferroelectricos, dispositivos de accionamiento piezoelectricos, dispositivos de accionamiento piezoceramicos, magnetoestrictores, sistemas termomecanicos (por ejemplo, materiales inteligentes, aleaciones con memoria de forma, y dispositivos de accionamiento rotatorios, etc).
Una versi6n actualmente contemplada consiste en un sistema de activaci6n de cierre lento que esta destinado a incluir a las placas de cierre hermetico 112 ,122, miembro (o miembros) 150 de tope y generador electrico 500 que se describe a continuaci6n. Este sistema implica al conjunto 140 de los miembros de tope que se controla automaticamente por la fuente de control 300 basandose en la realimentaci6n recibida de los sensores 170 a y 170b. Los sensores 170 a y 170b forman una parte de un sistema de control de bucle cerrado que ajusta automaticamente al f6rceps 10 antes de -o durante -la activaci6n basandose en parametros pre quirurgicos y en parametros continuamente detectados. Los sensores 170a y170b estan conectados a la fuente de control 300 (o al generador electroquirurgico) por medio de los cables 171 a y 171b, respectivamente. Un ejemplo de un sistema de control de bucle cerrado se describe en la solicitud de patente de EE.UU. de propiedad comun con numero de serie 10/427.832 US 2004/0015163 A1) expedida el 1 de mayo del 2003 y titulada "METODO Y SISTEMA PARA CONTROLAR LA SALIDA DE UN GENERADOR MEDICO DE RF".
En el sistema de activaci6n de cierre lento, el miembro (o miembros) de tope 150 se ajustan durante la activaci6n basandose en una condici6n quirurgica detectada continuamente (por ejemplo; impedancia del tejido, tipo de tejido, claridad del tejido, cumplimiento del tejido, etc), utilizando un bucle de control de realimentaci6n. Se contempla que esto podria permitir que el sistema de control regulase el ritmo de cierre de las placas de cierre hermetico 112 y 122 sobre el tejido. Inicialmente, el cirujano agarra el tejido de una manera rutinaria y encaja plenamente por acci6n de trinquete al f6rceps alrededor del tejido dentro de los intervalos de presi6n preferidos de tal manera que el miembro (o miembros) de tope 150 se extiendan fuera de los miembros de mordaza 110 (o 120) para obtener la distancia de intersticio prevista "G"..
La distancia preferida de intersticio "G" se podria seleccionar de una tabla de consultas durante el ajuste manual o bien determinarse mediante un algoritmo de ordenador guardado dentro de la fuente de control 300 durante el ajuste automatico. Por ejemplo, se usaria una distancia de intersticio "G" relativamente pequena en el cierre hermetico de una pluralidad de pequenos vasos sanguineos, mientras que es preferible una distancia mayor de intersticio "G" cuando se cierre hermeticamente un tejido mas grueso, tal como un 6rgano. La distancia de intersticio "G" entre las placas opuestas de cierre hermetico 112 y 122 durante el cierre hermetico preferiblemente abarca desde alrededor de 0.003 cm hasta aproximadamente 0.02 cm (alrededor de 0.001 pulgadas hasta aproximadamente 0.008 pulgadas). Para un tipo de tejido mas pequeno, la distancia de intersticio esta preferiblemente entre alrededor de
0.005 cm hasta aproximadamente 0,008cm) (alrededor de 0.002 pulgadas hasta aproximadamente 0.003 pulgadas) y para tipos de tejidos mayores la distancia de intersticio esta preferiblemente entre alrededor de 0.01 cm hasta aproximadamente 0.018 cm (aproximadamente 0.004 pulgadas hasta alrededor de 0.007 pulgadas.).
Una vez que el tejido 400 se ha agarrado entre los miembros de mordaza 110 y 120 comienza el proceso de cierre lento que implica la retirada de los miembros de tope 150. A medida que los miembros de tope 150 se retiran al interior de los miembros de mordaza 110 y 120, la distancia de intersticio "G" disminuye y resulta un cierre hermetico. Por tanto, el ritmo de cierre de las placas de cierre hermetico 112 y 122 esta directamente relacionado con los cambios en la distancia de intersticio "G" que, a su vez, dependen del ritmo de retirada del miembro (o miembros) de tope 150 . en el interior del miembro (o miembros) 110 6 120 de mordaza. De aqui que la regulaci6n de la tasa de retirada del miembro (o miembros) de tope 150 regule directamente el ritmo de cierre de las placas de cierre hermetico 112 y 122.
Los miembros de tope 150 se retiran a un ritmo predeterminado que se podria ajustar manualmente por el cirujano (por ejemplo, ajustando un mando de control 350 mostrado en la Figura 2,) o preferiblemente de un modo automatico, mediante la fuente de control 300 basandose en las senales de realimentaci6n (por ejemplo basandose en el espesor del tejido, temperatura del tejido, impedancia del tejido, humedad del tejido, claridad del tejido, cumplimiento del tejido durante la activaci6n etc). enviada por los sensores 170 a y 170b. Por ejemplo, los miembros de tope 150 se pueden programar para activarse en una manera de cierre lento mediante el ajuste automatico desde una distancia grande de intersticio, por ejemplo aproximadamente 0.25 cm (alrededor de 0,10 pulgadas,) o mayor hasta dentro de un intervalo preferido de intersticio de aproximadamente 0.003 cm hasta alrededor de 0.02 cm (aproximadamente 0.001 pulgadas hasta alrededor de 0, 008 pulgadas) durante la activaci6n. Como puede apreciarse, esto permite que cualquier cirujano realice una tecnica de cierre lento para cerrar hermeticamente grandes estructuras de tejido.
Se contempla tambien que la tecnica de cierre lento se pueda realizar utilizando una configuraci6n de miembro de tope fijo y unas placas de cierre hermetico parecidas a resortes. Como puede apreciarse, en este caso, los miembros de tope estan configurados para sobresalir o extenderse una distancia fija desde la placa o placas de cierre hermetico 112 para impedir que las placas de cierre hermetico se toquen entre si y se cortocircuiten. La placa de cierre hermetico, por ejemplo la 112 (o la placas de cierre hermetico 112 y122) esta configurada para incluir uno o mas resortes 149a, 149b, (o un conjunto de resortes) que se montan entre las placas de cierre hermetico 112 y 126 y el alojamiento 116 y 126 de mordaza, respectivamente. Se contempla que los resortes 149 permitan que las placas de cierre hermetico 112 y 122 se flexionen lentamente para acomodarse a la presi6n aplicada al tejido hasta que se obtenga una presi6n de cierre especificada (preferiblemente dentro del intervalo de trabajo antes especificado de aproximadamente 3 �g/cm2 hasta alrededor de 16 �g/cm2). Como puede apreciarse, las tasas de los resortes se pueden determinar para un efecto de tejido 6ptimo basandose en el tipo de tejido o en el espesor de tejido. Adicionalmente, se podrian incluir caracteristicas mecanicas que permitan que las tasas de tensi6n de resortes sean ajustadas de acuerdo con informaci6n de realimentaci6n sensorial procedente del generador a traves de los sensores 170a y 170b o de una entrada manual por parte del cirujano.
Se contempla que podria utilizarse cualquier tipo de resorte 149 a, .149b para realizar este objetivo o, alternativamente, se podria disponer un estrato de un material visco-elastico o un material inteligente entre las placas de cierre hermetico y el alojamiento de mordaza para proveer una tasa de resorte especificada. En este caso, las tecnicas de esterilizaci6n por radiaci6n gamma comprometerian obviamente al material visco-elastico o elast6mero y, en esas condiciones, se contemplan otras tecnicas de esterilizaci6n que mantendria la integridad del material visco-elastico o elast6mero, por ejemplo, la esterilizaci6n con 6xido de etileno.
El metodo de cierre hermetico segun la presente divulgaci6n se muestra en la Figura 5. Ademas, la Figura 6 representa un grafico que ilustra los cambios que se contempla que ocurran al colageno cuando esta sometido al cierre hermetico usando el metodo de la Figura 5. La linea G (t) representa la distancia de intersticio "G" a medida que cambia con el tiempo, la linea P(t) representa la presi6n aplicada al tejido que se esta cerrando hermeticamente a lo largo del tiempo, y la linea �(t) representa la energia electroquirurgica aplicada durante un periodo de tiempo especificado.
En la etapa 500, el f6rceps 10 agarra y comienza a aplicar presi6n al tejido 400 usando los miembros de mordaza 110 y 120. Esto se muestra como la etapa I en la Figura 6 durante cuyo tiempo las placas de cierre hermetico 112 y 122 se activan y estan en contacto con el tejido 400 pero no estan totalmente cerradas. Esto se ha representado por la brusca declinaci6n en la linea G(t) durante la etapa uno, que luego rapidamente se nivela. Cuando las placas de cierre hermetico 112 y 122 contactan al tejido 400 se aplica energia electroquirurgica a las mismas y el colageno contenido en ellas se desnaturaliza y se hace mas m6vil (es decir, se llcua).. Aunque se esta aplicando energia electroquirurgica, se aplica poca presi6n para crear un cierre hermetico. Esto se muestra por una linea horizontal recta P(t). Simultaneamente, el agua contenida dentro del tejido 400 se deja escapar de la zona de cierre hermetico. Como resultado, la temperatura de pico a la que se crea un cierre hermetico se reduce.
En la etapa 502, el colageno previamente fundido se mezcla con el fin de permitir que componentes estructurales (por ejemplo polimeros) se entrelacen como se muestra en la Etapa II.. La mezcla se puede lograr mediante la aplicaci6n de energia electroquirurgica de una frecuencia predeterminada y a la zona de cierre hermetico a traves de las placas de cierre hermetico 112 y 122 bajo una presi6n predeterminada. La frecuencia y amplitud 6ptimas de las ondas dependen de las estructuras de colageno que se estan mezclando y se podrian controlar automaticamente segun se ha especificado anteriormente. Esto se ha mostrado como Etapa II, donde la linea G(t), la linea P(t), y la
linea �(t) generalmente todas no han cambiado, representando que la distancia de intersticio, la presi6n, y la energia electroquirurgica permanecen generalmente constantes.
Una vez que el colageno se ha mezclado, se endurece mas mediante la aplicaci6n de energia electroquirurgica y de presi6n como se muestra en la Etapa III. Durante la Etapa III, la distancia de intersticio "G" disminuye a un ritmo predeterminado (por ejemplo, el ritmo de cierre es la inclinaci6n de la linea G(t), mientras que (por ejemplo, la linea P(t)) y la energia electroquirurgica (por ejemplo, la linea �(t)) aumentan. La presi6n preferiblemente aumenta a un ritmo que es suficientemente lento para resultar en un cierre hermetico eficaz, pero no suficientemente rapido para forzar a la masa de colageno que se esta formando fuera de la zona de cierre hermetico. Segun se ha indicado anteriormente, una de las modalidades actualmente contempladas indica que el ritmo en que la distancia de intersticio "G" y las placas de cierre hermetico 112 y 122 se cierran es controlado por la fuente de control 300 a traves del conjunto 140 de miembros de tope, que retira la pluralidad de los miembros de tope a traves de los controladores 155. Este ritmo al que el conjunto 140 de miembros de tope disminuye la distancia de intersticio "G" se podria determinar automaticamente basandose en las lecturas del conjunto de sensores 170a y 170b.
En la etapa 504, los sensores 170a y 170b detectan un parametro tal como tipo de tejido, espesor de tejido, cumplimiento del tejido, o impedancia del tejido y transmiten esa informaci6n a la fuente de control 300. Basandose en los algoritmos y datos contenidos en la misma, en la etapa 506, la fuente de control 300 selecciona la distancia ideal de intersticio "G" para el tejido que se va a cerrar hermeticamente asi como el ritmo al que se cerraran las placas de cierre hermetico 112 y 122. Esto se podria relacionar directamente tambien con el ritmo ideal de presi6n de cierre. Estos calculos se transmiten al conjunto 140 de miembros de tope que, en la etapa 508, extiende o prolonga los miembros de tope 150 de tal manera que las placas de cierre hermetico 112 y 122 se separen por la distancia de intersticio "G" una vez que los miembros de mordaza 110 y 120 se han cerrado. Una vez que se ha cumplido esto, en la etapa 510, las placas de cierre hermetico 112 y 122 se cierran en el ritmo determinado por el controlador de fuente 300,, es decir el conjunto 140 de miembros de tope envia senales a los controladores 155 para retirar los miembros de tope 150 al ritmo predeterminado asegurando que el ritmo es suficientemente lento para retener a la masa de colageno en la zona, resultando en un cierre hermetico eficaz.
Se contempla que la etapa 508 se podria eliminar en el caso en que los miembros de tope 150 o el conjunto 140 de miembros de tope esten configurados para retornar a una condici6n extendida pre-establecida con respecto a las placas de cierre hermetico 112 y 122 cada vez que los miembros de mordaza 110 y 120 se abren para agarrar o manipular tejido. Se contempla tambien que los miembros de tope podrian extenderse o bloquearse manual o automaticamente para un cierre hermetico con cierre no lento tales como los procedimientos descritos en cualquiera de las aplicaciones de propiedad comun anteriormente mencionadas.
El aparato y el metodo segun la presente divulgaci6n permiten procedimientos de cierre hermetico de tejido que retienen al colageno en la zona de cierre hermetico, lo cual es conocido que aumenta la consistencia, eficacia y resistencia mecanica de los cierres hermeticos de tejido.. Esto se realiza usando una activaci6n de cierre lento para desnaturalizar inicialmente al colageno y luego cerrar las placas de cierre hermetico a presi6n a un ritmo predeterminado con extrusi6n limitada de la masa de colageno mezclada de la zona de cierre hermetico que contribuye a un cierre hermetico eficaz y uniforme.
De lo anterior y con referencia a las diversas figuras de los dibujos, los expertos en la tecnica apreciaran que se pueden hacer tambien ciertas modificaciones a la presente divulgaci6n sin apartarse del alcance de la misma. Por ejemplo, y segun se mencion6 anteriormente, se contempla que cualquiera de las tecnicas metodos y mecanismos de cierre lento divulgados en la presente memoria se podria emplear en un f6rceps abierto tal como el f6rceps abierto 700 divulgado en la Figura 8. El f6rceps 700 incluye un conjunto de efector de extremo que se fija a los extremos distales 516a y 516b de los ejes 512a y 512b, respectivamente. El conjunto 600 de efector del extremo incluye un par de miembros de mordazas opuestas 610 y 620 que estan conectados pivotablemente alrededor de un pasador pivote 665 y que se pueden mover uno con respecto a otro para agarrar vasos o tejido.. Un conjunto de miembro de tope tal como el conjunto 140 de miembros de tope descrito en las figuras 1 a 7 o una serie de sensores 170 a y 170b se podrian disponer dentro del conjunto 600 de efector de extremo para una opci6n de cierre lento para el cirujano. Adicionalmente, el generador (no mostrado) que suministra energia al f6rceps 700 se podria configurar para regular automaticamente al conjunto 140 de miembros de tope (o a otros tipos de mecanismos de cierre lento descritos anteriormente) o bien el cirujano podria optar para controlar manualmente el cierre de las placas de cierre hermetico sobre el tejido segun se ha descrito anteriormente.
Cada eje 512a y 512b le incluye una empunadura 515 y 517, respectivamente, dispuestas en el extremo proximal 514a y 514b de la misma, cada una de las cuales define un agujero para dedo 515 a y 517 a, respectivamente, que pasa a traves del cual para recibir a un dedo del usuario. Los agujeros para dedos 515 a y 517 a facilitan el movimiento de los ejes 512 a y 512b uno con respecto al otro, que, a su vez, pivotan a los miembros de mordaza 610 y 620 desde una posici6n abierta en la que los miembros de mordaza 610 y 620 estan dispuestos en relaci6n de separaci6n uno con respecto a otro hasta una posici6n de fijaci6n o posici6n en la que los miembros de mordaza 610 y 620 cooperan para agarrar tejido o vasos entre ellos. Detalles adicionales referentes a un f6rceps abierto particular se divulgan en la solicitud de patente de EE.UU. de propiedad comun con n� de serie 10/962,116 (US 2005/0154387 A1) expedida el 8 de octubre de 2004 y titulada "INSTRUMENTO DE CIERRE �ERMETICO DE VASO ABIERTO CON MECANISMO DE CORTE DE RELO� DE ARENA Y SEGURIDAD SOBRE TRINQUETE".
Ademas, se contempla tambien que el f6rceps actualmente divulgado pueda incluir una configuraci6n de corte electrico para separar el tejido antes, durante o despues del corte. Una de dichas configuraciones electricas se describe en la solicitud de patente de EE. UU. de asignaci6n comun con numero de serie 10/932.612 (US 2005/0113826) titulada "Instrumento de cierre hermetico de vaso con mecanismo de corte electrico."
5 Ademas, se contempla que el f6rceps actualmente divulgado se podria configurar para incluir un mecanismo manual de cierre lento, una rueda rotatoria o una corredera que tras la activaci6n retire a los miembros de tope con respecto a las placas de cierre hermetico despues que la empunadura se ha encajado por efecto de trinquete y durante la activaci6n. Ademas, otro metodo podria permitir que el cirujano agarre y cierre el f6rceps alrededor del tejido (dentro del intervalo de presi6n especificada) y tras la activaci6n del interruptor (interruptor de pedal o interruptor de mano)
10 los miembros de tope automaticamente se retiren basandose en condiciones quirurgicas detectadas o en un algoritmo preestablecido o mediante una acci6n electromecanica preestablecida.
Aunque se han mostrado varias realizaciones de la invenci6n en los dibujos o se han descrito en la presente memoria, no se pretende que la invenci6n se limite a los mismos. Por tanto, la descripci6n anterior no debe considerarse como limitativa, sino simplemente como ejemplificaciones de realizaciones particulares. Los expertos
15 en la tecnica contemplaran otras modificaciones dentro del alcance de las reivindicaciones que se adjuntan como apendice a la presente memoria.
Claims (3)
- REIVINDICACIONES1., F6rceps bipolar electroquirurgico (10) para cerrar hermeticamente tejido, que comprende como minimo un miembro (12) de eje que tiene un conjunto (100) de efector de extremo dispuesto en un extremo distal del mismo, cuyo conjunto (100) de efector de extremo incluye unos miembros de mordaza (110,120) que se pueden mover desde una primera posici6n en relaci6n de separaci6n uno con respecto al otro hasta como minimo una posici6n subsiguiente en donde los miembros de mordaza (110, 120) cooperan para agarrar tejido entre los mismos, en dondecada uno de los miembros de mordaza (110, 120) incluye una placa de cierre hermetico (112, 122) que comunica energia electroquirurgica a traves del tejido sujeto entre los mismos, al menos una de las placas de cierre hermetico (112, 122) incluyendo como minimo un miembro de tope (150), configurado para sobresalir una distancia fija de la placa de cierre hermetico para separar las placas de cierre hermetico (112, 122) en una distancia de intersticio predeterminada (G), comprendiendo ademas cada uno de los miembros de mordaza (110, 120) un alojamiento aislante (116, 126) de mordaza configurado para soportar la respectiva placa de cierre hermetico tiempo (112, 122),caracterizado por que como minimo una de las placas de cierre hermetico (112, 122) incluye al menos un resorte (149a, 149b) y porque el como minimo un resorte (149a) permite que la como minimo una placa de cierre hermetico (112, 122) se flexione lentamente para acomodarse a la presi6n aplicada al tejido hasta que se obtenga una presi6n de cierre especificada basandose en como minimo uno del tipo de tejido y del espesor de tejido, en donde el como minimo un resorte (149a) esta montado entre la al menos una de las placas de cierre hermetico (112, 122) y el alojamiento respectivo aislante de mordaza (116, 126).
- 2.El f6rceps bipolar electroquirurgico para cerrar hermeticamente tejido segun la reivindicaci6n 1, en donde la presi6n aplicada al tejido es de aproximadamente 3 �g/cm2 hasta alrededor de 16 �g/cm2..
- 3.El f6rceps bipolar electroquirurgico para cerrar hermeticamente tejido segun la reivindicaci6n 1 o 2, que comprende ademas:un canal (210) de bisturi definido a lo largo de la longitud de un como minimo uno de los miembros de mordaza (110, 120), cuyo canal (210) de bisturi esta dimensionado para realizar un movimiento de vaiven a un mecanismo de corte
- (200)
- a lo largo del mismo; y
un dispositivo de accionamiento (70) acoplado operativamente a uno de los miembros (12) de eje para hacer avanzar selectivamente al mecanismo de corte (200) desde una primera posici6n en donde el mecanismo de corte- (200)
- esta dispuesto en un lugar proximal al tejido sujeto entre los miembros de mordaza (110, 120) hasta como minimo una posici6n subsiguiente en donde el mecanismo de corte (200) esta dispuesto en un lugar distal al tejido sujeto entre los miembros de mordaza (110, 120).
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| US11/095,123 US7491202B2 (en) | 2005-03-31 | 2005-03-31 | Electrosurgical forceps with slow closure sealing plates and method of sealing tissue |
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| ES06006716T Expired - Lifetime ES2306319T3 (es) | 2005-03-31 | 2006-03-30 | Forceps electroquirurgico con placas selladoras de cierre lento y metodo de sellar tejidos. |
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| DE (1) | DE602006001370D1 (es) |
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| US20090088745A1 (en) | 2007-09-28 | 2009-04-02 | Tyco Healthcare Group Lp | Tapered Insulating Boot for Electrosurgical Forceps |
| US8267936B2 (en) | 2007-09-28 | 2012-09-18 | Tyco Healthcare Group Lp | Insulating mechanically-interfaced adhesive for electrosurgical forceps |
| US8251996B2 (en) | 2007-09-28 | 2012-08-28 | Tyco Healthcare Group Lp | Insulating sheath for electrosurgical forceps |
| US8235992B2 (en) | 2007-09-28 | 2012-08-07 | Tyco Healthcare Group Lp | Insulating boot with mechanical reinforcement for electrosurgical forceps |
-
2005
- 2005-03-31 US US11/095,123 patent/US7491202B2/en not_active Expired - Fee Related
-
2006
- 2006-03-28 CA CA2541039A patent/CA2541039C/en not_active Expired - Fee Related
- 2006-03-29 AU AU2006201300A patent/AU2006201300B2/en not_active Ceased
- 2006-03-30 ES ES08004655T patent/ES2386159T3/es not_active Expired - Lifetime
- 2006-03-30 EP EP06006716A patent/EP1707143B1/en not_active Expired - Lifetime
- 2006-03-30 EP EP08004655A patent/EP1946715B1/en not_active Expired - Lifetime
- 2006-03-30 DE DE602006001370T patent/DE602006001370D1/de not_active Expired - Lifetime
- 2006-03-30 ES ES06006716T patent/ES2306319T3/es not_active Expired - Lifetime
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2009
- 2009-01-26 US US12/359,571 patent/US8382754B2/en not_active Expired - Fee Related
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|---|---|
| AU2006201300B2 (en) | 2012-02-09 |
| CA2541039A1 (en) | 2006-09-30 |
| EP1946715A1 (en) | 2008-07-23 |
| EP1707143B1 (en) | 2008-06-04 |
| US20060224158A1 (en) | 2006-10-05 |
| US20090131934A1 (en) | 2009-05-21 |
| EP1946715B1 (en) | 2012-07-11 |
| ES2306319T3 (es) | 2008-11-01 |
| US7491202B2 (en) | 2009-02-17 |
| US8382754B2 (en) | 2013-02-26 |
| DE602006001370D1 (de) | 2008-07-17 |
| EP1707143A1 (en) | 2006-10-04 |
| CA2541039C (en) | 2014-06-10 |
| AU2006201300A1 (en) | 2006-10-19 |
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