ES2289334T3 - Conjunto de herramienta para dispositivo de grapado quirurgico. - Google Patents

Conjunto de herramienta para dispositivo de grapado quirurgico. Download PDF

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ES2289334T3
ES2289334T3 ES03770659T ES03770659T ES2289334T3 ES 2289334 T3 ES2289334 T3 ES 2289334T3 ES 03770659 T ES03770659 T ES 03770659T ES 03770659 T ES03770659 T ES 03770659T ES 2289334 T3 ES2289334 T3 ES 2289334T3
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jaws
cam
approach
tool set
set according
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Frank J. Viola
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Covidien LP
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B17/07207Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously the staples being applied sequentially
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00367Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214Stapler heads
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214Stapler heads
    • A61B2017/07271Stapler heads characterised by its cartridge
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214Stapler heads
    • A61B2017/07285Stapler heads characterised by its cutter
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2927Details of heads or jaws the angular position of the head being adjustable with respect to the shaft
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2931Details of heads or jaws with releasable head
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2932Transmission of forces to jaw members
    • A61B2017/2933Transmission of forces to jaw members camming or guiding means
    • A61B2017/2934Transmission of forces to jaw members camming or guiding means arcuate shaped guiding means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2932Transmission of forces to jaw members
    • A61B2017/2933Transmission of forces to jaw members camming or guiding means
    • A61B2017/2936Pins in guiding slots
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2932Transmission of forces to jaw members
    • A61B2017/2944Translation of jaw members

Abstract

Un conjunto de herramienta (10), que comprende: un par de mandíbulas, con una primera mandíbula (12) y una segunda mandíbula (14), presentando cada una de las mandíbulas un extremo proximal y un extremo distal, siendo movibles la primera y la segunda mandíbulas, una en relación con otra, entre una posición separada y una posición aproximada; un primero (32) y un segundo (36) seguidores de leva, soportados en la primera o en la segunda mandíbulas; y un miembro (16) de aproximación, que incluye, al menos, una superficie (28, 30) de leva destinada a aplicarse con el primero y el segundo seguidores de leva, siendo movible el miembro de aproximación con el fin de desplazar dicha, al menos, una superficie de leva en relación con el primero y el segundo seguidores de leva, presentando el miembro de aproximación una carrera de accionamiento que incluye partes inicial, segunda y final, en el que el miembro (16) de aproximación puede ser hecho mover con el fin de desplazar dicha, al menos,una superficie de leva (28, 30) en relación con el primero y el segundo seguidores (32, 36) de leva para producir el movimiento de la primera y la segunda mandíbulas (12, 14) entre la posición separada y la posición aproximada, estando configurada dicha, al menos, una superficie de leva (28, 30), durante la parte inicial de la carrera de accionamiento, con el fin de aproximar los extremos distales de la primera y la segunda mandíbulas previamente a la aproximación de los extremos proximales de la primera y la segunda mandíbulas durante la segunda parte de la carrera de accionamiento, caracterizado porque: durante la segunda parte de la carrera de accionamiento, los extremos distales de la primera y la segunda mandíbulas se separan, uno de otro, hasta una posición resultante en la que las mandíbulas sean paralelas, y, después, durante la parte final de la carrera de accionamiento se acercan la primera y la segunda mandíbulas, entre sí, en relación de cierre sustancialmente paralelo, de modo que definan un espacio libre para el tejido.

Description

Conjunto de herramienta para dispositivo de grapado quirúrgico.
Antecedentes 1. Campo técnico
La presente descripción se refiere, en general, a un conjunto de herramienta quirúrgica para manipular fijaciones y/o aplicarlas en tejidos. Más concretamente, la presente invención se refiere a conjuntos de herramienta y a dispositivos quirúrgicos.
2. Antecedentes de la técnica relacionada
Las grapadoras quirúrgicas y los conjuntos de herramienta para sujetar tejido entre estructuras de mandíbula opuestas de un conjunto de herramienta y, después, fijar el tejido sujetado, son bien conocidos en la técnica. Estos dispositivos pueden incluir una cuchilla para cortar el tejido fijado. Tales grapadoras con configuraciones laparoscópicas o endoscópicas, también, son bien conocidas en la técnica. Ejemplos de grapadoras quirúrgicas endoscópicas de este tipo se describen en las patentes norteamericanas nos. 6.330.965, 6.250.532, 6.241.139, 6.109.500 y 6.079.606.
Típicamente, tales grapadoras incluyen un miembro o conjunto de herramienta, con un par de mandíbulas que incluyen un cartucho de grapas para alojar una pluralidad de grapas previstas en, al menos, dos filas separadas lateralmente, y un yunque, que incluye una pluralidad de cavidades de formación de grapas para recibir y formar ramas de grapas a medida que éstas sean impulsadas a partir del cartucho. El yunque y el cartucho están soportados, de modo pivotante, uno junto a otro, y pueden ser hechos pivotar, uno respecto a otro, entre posiciones abierta y cerrada. En uso, el tejido se coloca entre las mandíbulas, en la posición abierta, y las mandíbulas son hechas pivotar hasta la posición cerrada, con el fin de sujetar el tejido entre ellas.
Un problema asociado con las grapadoras y los conjuntos de herramienta convencionales consiste en que al pivotar el yunque y el cartucho, uno en relación con otro, el cierre se produce, primero, en el extremo proximal de las mandíbulas, y, después, en el extremo distal de las mismas. Esta secuencia de cierre de mandíbulas produce el efecto de mover el tejido posicionado entre las mandíbulas hacia el extremo distal de las mismas, expulsándolo, por tanto, de las mandíbulas.
Durante los procesos laparoscópicos o endoscópicos, el acceso al sitio de cirugía se logra mediante una incisión pequeña o merced a una cánula estrecha insertada a través de una pequeña abertura de entrada en un paciente. Como consecuencia de la zona limitada disponible para acceder al sitio quirúrgico, a veces se usan grapadoras endoscópicas para agarrar y/o manipular tejido. Las grapadoras convencionales con un yunque o un cartucho montados en un punto de pivote fijo, susceptibles de ser hechos pivotar hasta una posición cerrada, no son particularmente adecuadas para agarrar tejido, porque en el extremo distal de las mandíbulas se produce, solamente, una fuerza de sujeción limitada.
Por consiguiente, existe la necesidad de un miembro o conjunto de herramienta de grapado quirúrgico endoscópico con mandíbulas pivotantes que puedan ser hechas funcionar de modo que agarren, manipulen y/o fijen tejido de manera efectiva, incluso mediante el extremo de las mandíbulas, sin desplazamiento distal del tejido posicionado entre las mandíbulas, o minimizando dicho desplazamiento.
El documento US-A-5 816 471 describe un dispositivo quirúrgico, de acuerdo con el preámbulo de la reivindicación 1, con un par de mandíbulas montadas en el extremo distal. Las mandíbulas están montadas de manera rígida en un cuerpo inflexible, conectado con un mango de accionamiento en el extremo proximal. Las mandíbulas están previstas para un cierre de "punta a cola", por el que los extremos distales de las mandíbulas se cierran contra un tejido, y, luego, se acercan los extremos proximales de las mandíbulas, mientras que las puntas de las mandíbulas mantienen el tejido en posición.
Compendio
De acuerdo con la presente invención, se ofrece un conjunto de herramienta que comprende: un par de mandíbulas con una primera y una segunda mandíbulas, presentando cada una de las mandíbulas un extremo proximal y un extremo distal, pudiendo ser movidas la primera y la segunda mandíbulas, una en relación con otra, entre una posición separada y una posición aproximada; un primero y un segundo seguidores de leva, soportados en la primera mandíbula o en la segunda mandíbula; y un miembro de aproximación, que incluye, al menos, una superficie de leva destinada a aplicarse con el primero y el segundo seguidores de leva, pudiendo ser movido el miembro de aproximación con el fin de desplazar dicha, al menos, una superficie de leva en relación con el primero y el segundo seguidores de leva, presentando el miembro de aproximación una carrera de accionamiento que incluye partes inicial, segunda y final, en el que el miembro de aproximación puede ser movido con el fin de desplazar dicha, al menos, una superficie de leva en relación con el primero y el segundo seguidores de leva para producir el movimiento de la primera y la segunda mandíbulas entre la posición separada y la posición aproximada, estando configurada dicha, al menos, una superficie de leva, durante la parte inicial de la carrera de accionamiento, de modo que permita aproximar los extremos distales de la primera y la segunda mandíbulas previamente a la aproximación de los extremos proximales de la primera y la segunda mandíbulas durante la segunda parte de la carrera de accionamiento, y, después, durante la parte final de la carrera de accionamiento, de modo que permita acercar la primera y la segunda mandíbulas, en relación de cierre sustancialmente paralelo, y definir un espacio libre para el tejido, caracterizado porque durante la segunda parte de la carrera de accionamiento, los extremos distales de la primera y la segunda mandíbulas son separados, uno de otro, hasta una posición resultante en la que las mandíbulas sean paralelas.
Se ofrece, también, un dispositivo quirúrgico que comprende un conjunto de herramienta de este tipo.
Breve descripción de los dibujos
Para permitir una mejor comprensión de la presente invención y para mostrar el modo en que puede ser puesta en práctica, se hará referencia ahora, a modo de ejemplo solamente, a los dibujos adjuntos, en los que:
la figura 1 es una vista, en perspectiva lateral, de una realización del conjunto de herramienta descrito en lo que sigue, en la posición de aproximación;
la figura 2 es una vista, lateral, del conjunto de herramienta mostrado en la figura 1;
la figura 3 es una vista de despiece, en perspectiva lateral, del conjunto de herramienta mostrado en la figura 1;
la figura 4A es una vista, esquemática, de las mandíbulas del conjunto de herramienta mostrado en la figura 1, en una primera etapa de aproximación de las mismas;
la figura 4B es una vista, esquemática, de las mandíbulas mostradas en la figura 4A en una segunda etapa de aproximación de las mismas;
la figura 4C es una vista, esquemática, de las mandíbulas mostradas en la figura 4B en posición aproximada;
la figura 5 es una vista, en perspectiva lateral, de otra realización del conjunto de herramienta descrito en lo que sigue, en la posición aproximada;
la figura 6 es una vista de despiece, en perspectiva lateral, del conjunto de herramienta mostrado en la figura 5;
la figura 7 es una vista, en perspectiva lateral, del miembro de aproximación del conjunto de herramienta mostrado en la figura 6;
la figura 8 es una vista, en perspectiva lateral, del miembro de sujeción dinámica del conjunto de herramienta mostrado en la figura 6;
la figura 9 es una vista desde arriba, en sección transversal parcial, con partes arrancadas, de parte del conjunto de cartucho y que muestra el accionador de articulación y disparo del conjunto de herramienta mostrado en la figura 6; y
la figura 10 es una vista, en sección transversal, con partes eliminadas y partes añadidas, en sección por las líneas 10-10 de la figura 9.
Descripción detallada
En la descripción detallada que sigue, se divulga un conjunto de herramienta con un par de mandíbulas. Cada una de las mandíbulas presenta un extremo proximal y un extremo distal, y la primera mandíbula puede ser hecha mover en relación con la segunda mandíbula entre una posición separada y una posición aproximada. Un primero y un segundo seguidores de leva están soportados en la primera mandíbula. Hay un miembro de aproximación movible en relación con la primera mandíbula e incluye, al menos, una superficie de leva destinada a aplicarse con el primero y el segundo seguidores de leva. El miembro de aproximación es movible en relación con la primera mandíbula con el fin de desplazar dicha, al menos, una superficie de leva en relación con el primero y el segundo seguidores de leva, para producir el movimiento de la primera y la segunda mandíbulas desde la posición separada a la posición aproximada. Dicho, al menos, un canal de leva está configurado con el fin de aproximar los extremos distales de la primera y la segunda mandíbulas previamente a la aproximación de los extremos proximales de las mismas. Al aproximar primero los extremos distales de la primera y la segunda mandíbulas, el tejido posicionado entre las mandíbulas no es empujado hacia delante en las mandíbulas durante el cierre de las mismas. Además, las mandíbulas pueden agarrar y manipular tejido de mejor manera usando sus extremos distales.
En una realización, la primera mandíbula incluye un yunque y la segunda mandíbula incluye un conjunto de cartucho que aloja una pluralidad de grapas. En otra realización, dicha, al menos, una superficie de leva incluye un primero y un segundo canales de leva, y el miembro de aproximación incluye una placa plana con los canales de leva formados en ella. La primera mandíbula incluye una ranura longitudinal formada en su extremo proximal, y el miembro de aproximación está posicionado, a deslizamiento, en la ranura longitudinal. El primero y el segundo seguidores de leva están soportados en el extremo proximal de la primera mandíbula y se extienden a través de la ranura longitudinal adyacente al primero y al segundo canales de leva. El primer seguidor de leva se extiende a través del primer canal de leva y el segundo seguidor de leva se extiende a través del segundo canal de leva. Ventajosamente, el conjunto de herramienta puede estar asociado, de modo pivotante, con una parte de cuerpo, merced a una unión articulada. La parte de cuerpo puede formar el extremo distal de un dispositivo de grapado quirúrgico o la parte proximal de una unidad de carga desechable.
En otra realización, el conjunto de herramienta incluye un yunque, un conjunto de cartucho que aloja una pluralidad de grapas y un miembro de sujeción dinámica. El yunque y el conjunto de cartucho pueden ser hechos mover, uno en relación con otro, entre una posición separada y una posición aproximada. El miembro de sujeción dinámica puede ser hecho mover en relación con el yunque y el conjunto de cartucho con el fin de expulsar las grapas del conjunto de cartucho. El conjunto de herramienta está unido, de modo pivotante, con una parte de cuerpo y puede ser hecho pivotar en relación con la parte de cuerpo desde una posición alineada con el eje longitudinal de la parte de cuerpo hasta una posición orientada en ángulo en relación con el eje longitudinal de la parte de cuerpo. Un accionador de articulación y disparo se extiende, al menos parcialmente, en la parte de cuerpo y el conjunto de herramienta. El accionador de articulación y disparo está asociado operativamente con el miembro de sujeción dinámica y el conjunto de herramienta y es movible en relación con ellos para, selectivamente, pivotar el conjunto de herramienta en relación con la parte de cuerpo y/o mover el miembro de sujeción dinámica en relación con el conjunto de herramienta con el fin de expulsar las grapas del cartucho.
Ventajosamente, el accionador de articulación y disparo puede incluir una banda flexible con una primera parte de extremo, que se extienda, al menos parcialmente, en la parte de cuerpo y en el conjunto de cartucho, una parte central, que se extienda desde la primera parte de extremo, asociada operativamente con el miembro de sujeción dinámica, y una segunda parte de extremo, que se extienda desde la parte central, en el conjunto de cartucho, y, al menos parcialmente, en la parte de cuerpo, hasta una posición adyacente al primer extremo. El accionador de articulación y disparo está asociado operativamente con el conjunto de herramienta, de modo que el movimiento de la primera parte de extremo o de la segunda parte de extremo de la banda flexible, proximal e independientemente de la otra parte de extremo, produzca el pivotamiento del conjunto de herramienta en relación con la parte de cuerpo, y el movimiento simultáneo de la primera y la segunda partes de extremo de la banda flexible produzca el movimiento del miembro de sujeción dinámica, con el fin de expulsar las grapas del conjunto de cartucho. En otra realización, un miembro de aproximación está asociado operativamente con el conjunto de herramienta y puede ser hecho mover en relación con éste, con el fin de mover el yunque y el conjunto de cartucho desde la posición separada a la posición aproximada.
En lo que sigue se describirán con detalle realizaciones específicas del presente conjunto de herramienta para un dispositivo de grapado, con referencia a los dibujos, en los que números de referencia similares designan elementos idénticos o correspondientes en cada una de las distintas vistas.
Las figuras 1-3 muestran una realización del presente conjunto de herramienta, mostrado en general con 10, para uso con un dispositivo de grapado quirúrgico. El conjunto 10 de herramienta incluye un par de mandíbulas que incluyen un yunque 12, un conjunto 14 de cartucho y un miembro 16 de aproximación. El conjunto 14 de cartucho incluye un canal 18 de soporte para recibir un cartucho 14a de grapas. El canal 18 de soporte presenta una parte distal 18a, de canal abierto, y una parte proximal 18b, que define un cilindro truncado 18c. Aunque no se muestra con detalle, el cartucho 14a de grapas aloja una pluralidad de grapas y puede incluir empujadores convencionales (no mostrados) para convertir el movimiento de un conjunto de impulsión de grapas, que incluye, típicamente, una deslizadera (por ejemplo, 131, en la figura 6) en movimiento de las grapas a través de aberturas o ranuras en una superficie 25 de aplicación con el tejido del cartucho 14a.
El yunque 12 presenta una superficie 20 de aplicación con el tejido, con un extremo distal 20a, un extremo proximal 20b y una parte de cuerpo proximal 22. Una ranura longitudinal 24 se extiende a lo largo del eje geométrico longitudinal del yunque 12, en la superficie 20 de aplicación con el tejido, y está destinada a recibir, a deslizamiento, parte de un conjunto de impulsión. El conjunto de impulsión incluye, típicamente, una barra de impulsión, un conjunto de cierre, una deslizadera y una pluralidad de empujadores. El conjunto de impulsión está destinado a expulsar grapas del cartucho y, preferiblemente, también, durante el disparo del dispositivo, mantiene un espacio libre uniforme deseado para el tejido entre el cartucho y el yunque. La parte de cuerpo proximal 22 del yunque 12 está destinada a ser recibida, de modo generalmente pivotante, dentro del cilindro truncado 18c de la parte proximal 18b del canal 18 de soporte, de modo que la superficie 20 de aplicación con el tejido del yunque 12 pueda pivotar desde una posición separada de la superficie 25 de aplicación con el tejido del cartucho 14a hasta una posición aproximada, en alineación y yuxtaposición con ella.
El conjunto 10 de herramienta incluye un miembro 16 de aproximación con uno o más canales 28 y 30 de leva. Preferiblemente, el miembro de aproximación incluye un par de canales de leva, aunque puede preverse un único canal de leva con un par de superficies de leva. El miembro 16 de aproximación está previsto de modo que sea deslizable linealmente en la parte proximal 18b del canal 18 y en una ranura 22a formada en la parte de cuerpo proximal 22 del yunque 12. Un seguidor 32 de leva atraviesa un orificio 34 formado en la parte proximal 22 del yunque 12 y un orificio 35 en la parte proximal 18b del canal 18 de soporte, y está posicionado dentro del canal 28 de leva. Un seguidor 36 de leva, insertado en el orificio 39 de la parte proximal 18b, atraviesa un segundo orificio 38 formado en la parte proximal 22 del yunque 12, y está posicionado dentro del canal 30 de leva. Cuando el miembro 16 de aproximación sea hecho avanzar en la ranura 22a de la parte proximal 22 del yunque 12, los seguidores 32 y 36 de leva se mueven, respectivamente, en los canales 28 y 30 de leva. Como el miembro 16 de aproximación sólo puede moverse linealmente en la ranura 22a, el movimiento del miembro 16 de aproximación en dirección distal produce el movimiento pivotante del yunque 12 desde la posición abierta o separada hasta la posición cerrada o aproximada. Los ángulos de las ranuras de leva pueden preverse de manera que permitan una gran diversidad de movimientos de aproximación, con el fin de mejorar las ventajas mecánicas y conseguir resultados específicos, por ejemplo, el agarre del tejido.
Con referencia, también, a las figuras 4A-4C, los canales 28 y 30 de leva están configurados para hacer pivotar el yunque 12, desde una posición abierta (figura 4A), en dirección al conjunto de cartucho 14 de manera controlada para facilitar, inicialmente, el agarre del tejido y, después, permitir el cierre, sustancialmente en paralelo, del yunque y del conjunto de cartucho. De modo más específico, los canales 28 y 30 de leva están configurados, preferiblemente, con el fin de posicionar el extremo distal 20a de la superficie 20 de contacto con el tejido del yunque 12, sustancialmente en contacto con el cartucho 14 (figura 4B) durante la parte inicial de la carrera de accionamiento del miembro 16 de aproximación. Ello facilita el agarre de tejido, incluso tejido muy delgado. Durante una segunda parte de la carrera de accionamiento del miembro 16 de aproximación, el extremo distal 20a del yunque 12 es separado del conjunto 14 de cartucho hasta una posición resultante en la que la superficie 20 de aplicación con el tejido del yunque 12 sea paralela, o sustancialmente paralela, a la superficie 25 de aplicación con el tejido del conjunto 14 de cartucho. Durante la parte final de la carrera de accionamiento del miembro 16 de aproximación, el yunque 12 y el conjunto 14 de cartucho se acercan, en relación de cierre paralelo o sustancialmente paralelo, de modo que definan un espacio libre deseado para el tejido (figura 4C). Debe señalarse que puede conseguirse cualquier movimiento deseado del yunque 12 usando los seguidores de leva descritos en este documento. Al mover el yunque 12 en relación con el conjunto 14 de cartucho desde la posición separada a la posición aproximada de la manera descrita en lo que antecede, es decir, cierre frontal o distal a trasero o proximal, se elimina, sustancialmente, la tendencia del tejido a moverse hacia delante en las mandíbulas, como en dispositivos convencionales.
Aunque el miembro de aproximación 16 se ilustra en forma de placa con dos canales de leva distintos, pueden preverse miembros de aproximación configurados de modo diferente. Por ejemplo, puede preverse un único canal de leva que se aplique con dos seguidores de leva. Además, los canales de leva no tienen carácter limitativo y pueden estar formados en la superficie de una placa, barra o similar. En un dispositivo de este tipo, el yunque puede ser empujado mediante un miembro de carga hasta la posición cerrada o de sujeción.
Aunque no se hayan considerado uno o más accionadores para hacer avanzar el miembro de aproximación y/o disparar grapas a partir del conjunto de cartucho, está previsto que puedan usarse uno o más de una diversidad de accionadores pivotables, giratorios o deslizables conocidos, por ejemplo, disparadores, botones, palancas, etc., para aproximar el presente conjunto de cartucho y/o disparar grapas a partir del cartucho. Debe señalarse, también, que el conjunto de herramienta descrito puede constituir o formar la parte distal de una unidad de carga desechable o puede estar incorporado directamente en el extremo distal de un instrumento quirúrgico, por ejemplo, una grapadora quirúrgica, y puede incluir un conjunto de cartucho reemplazable.
Las figuras 5-10 describen otra realización del presente conjunto de herramienta, mostrada en general con 100. El conjunto 100 de herramienta incluye un yunque 112 y un conjunto 114 de cartucho, un miembro 116 de aproximación y una parte de cuerpo alargada 120 que incluye una unión articulada, designada, en general, con 122. La parte de cuerpo alargada 120 puede constituir el extremo proximal de una unidad de carga desechable o el extremo distal de un dispositivo de grapado quirúrgico. El conjunto 100 de herramienta incluye, también, un mecanismo 124 combinado de accionamiento de articulación y disparo para hacer girar el conjunto 100 de herramienta en torno a la unión articulada 122 y expulsar grapas del conjunto 114 de cartucho. Aunque la unión articulada 122 se ilustra a modo de miembro ondulado flexible con zonas curvadas preformadas, puede ser cualquier tipo conocido de unión que permita articulación, por ejemplo, una espiga de pivote, una unión de rótula, una unión universal, etc.
El miembro 116 de aproximación es sustancialmente similar al miembro 16 de aproximación e incluye, también, canales 129 y 130 de leva (figura 7). El miembro 116 de aproximación incluye, además, un par de canales 126 de guía. Los canales 126 de guía están destinados a recibir espigas 128 de guía que se extienden a través de la parte 120 de cuerpo alargada y cuya función consiste en mantener el miembro 116 de aproximación a lo largo de una trayectoria de desplazamiento lineal. El miembro 116 de aproximación está hecho de un material flexible, por ejemplo, acero para muelles, susceptible de curvarse en torno a la unión articulada 122. Alternativamente, puede preverse que el miembro 116 de aproximación pueda incluir un vástago elástico, una banda o similar con superficies de leva formadas en ellos. El miembro 116 de aproximación funciona sustancialmente de la misma manera que el miembro 16 de aproximación y no se describirá con más detalle en este documento.
El conjunto 114 de cartucho incluye un canal 118 de soporte, una deslizadera 131 y un miembro 132 de sujeción dinámica, que, preferiblemente, incluye una pestaña superior 134a destinada a aplicarse, a deslizamiento, con una superficie de apoyo del yunque, y una pestaña inferior 134b destinada a aplicarse, a deslizamiento, con una superficie de apoyo del cartucho. Una cuchilla 134 está soportada, preferiblemente, en una parte central 134c del miembro 132 de sujeción dinámica, con el fin de cortar tejido. La cuchilla 134 puede estar asegurada en el miembro 132 de sujeción dinámica de manera amovible o fija, puede estar formada de modo enterizo con el miembro 132 de sujeción dinámica, o estar conformada, directamente por amolado, en el miembro 132 de sujeción dinámica. La deslizadera 131 está posicionada a deslizamiento en el cartucho 114, para desplazarse por él de manera conocida, con el fin de expulsar grapas del cartucho. La deslizadera 131 o similar puede ser enteriza o monolítica con el miembro 132 de sujeción dinámica. La deslizadera 131 está posicionada de modo distal en relación con el miembro 132 de sujeción dinámica, está aplicada con él y es empujada por él. La función de 131 consiste en producir el disparo o la expulsión de las grapas con el fin de sujetar el tejido antes de cortar el tejido grapado. La pestaña 134b, preferiblemente, se posiciona dentro de un rebajo 138 formado en la base del cartucho 114. Preferiblemente, la pestaña 134a se posiciona dentro de un rebajo único o separado formado en el yunque 112. Por otra parte, las pestañas 134a y 134b no tienen que estar posicionadas en un rebajo sino que pueden aplicarse, a deslizamiento, con una superficie, respectivamente, del yunque y del cartucho. Preferiblemente, el miembro 132 de sujeción dinámica está posicionado de modo proximal, en relación con la deslizadera 131, en el conjunto 114 de cartucho. El miembro 132 de sujeción dinámica está destinado a disponer, restablecer y/o mantener el espacio libre deseado para el tejido en la zona del conjunto 100 de herramienta adyacente a la deslizadera 131, durante el disparo de grapas.
Es deseable que el material y el grosor del yunque, y, de preferencia, del miembro de sujeción dinámica, se seleccionen de modo que se minimice la deformación de éstos durante el disparo del dispositivo. Tales materiales incluyen acero inoxidable de calidad quirúrgica. El yunque se forma, preferiblemente, a modo de unidad maciza. Alternativamente, el yunque puede estar formado por un conjunto de partes con componentes convencionales.
Con referencia a las figuras 6, 9 y 10, el mecanismo 124 de articulación y disparo incluye un miembro 140 de tensión que puede presentar bucles 124 u otras partes de conexión o conectores para su conexión con miembros de conexión adecuados de uno o más accionadores o de un mecanismo de accionamiento. Aunque se ilustra a modo de banda flexible, el miembro 140 de tensión puede ser, o puede incluir, uno o más miembros de impulsión flexibles cualesquiera con los requisitos de resistencia mecánica necesarios y susceptibles de realizar las funciones descritas en lo que sigue, por ejemplo, una correa o un cable trenzados o tejidos, un material polimérico, una para-aramida tal como Kevlar^{TM}, etc. Kevlar^{TM} es la designación comercial del poli(fenilenotereftalamida), vendido por DuPont. Un par de miembros fijos o giratorios adecuados, preferiblemente rodillos 142a y 142b, están asegurados en el extremo distal del conjunto 114 de cartucho. Los rodillos 142a y 142b pueden estar formados en una tapa amovible 114b (figura 6) del conjunto de cartucho 114, o soportados en ella. Alternativamente, la tapa 114b puede estar formada de modo enterizo con el cartucho 114a de grapas o con el canal 118 del cartucho. Los rodillos 142a y 142b pueden estar asegurados, también, en el canal 118 de soporte de cartucho o formados a partir de él. El miembro 140 de tensión se extiende de modo distal en relación con el cuerpo alargado 120 del conjunto 100 de herramienta, de modo distal en un canal periférico 142 del cartucho 114a de grapas, en torno al rodillo 142a, de modo proximal, preferiblemente, a lo largo de la ranura longitudinal central 144 formada en el cartucho 114a, a través de una ranura 200, preferiblemente una ranura transversal, en una parte proximal del miembro 132 de sujeción dinámica, o en torno a dicha parte proximal, de modo distal en torno al rodillo 142b, y, de nuevo, de modo proximal en un canal 146 formado en el cartucho 114a hasta una parte proximal del cuerpo alargado 120. Alternativamente, pueden emplearse dos miembros de tensión, cada uno de los cuales puede estar asegurado en el miembro 132 de sujeción dinámica. Como se ilustra en la figura 10, los canales 142 y 146 pueden estar definidos, al menos parcialmente, por una pared interior y/o una pared exterior del cartucho 114a y/o por el canal 118 de soporte del cartucho. A diferencia de la ilustración, los canales 142 y 146 tienen que estar en posiciones consistentes, es decir, idénticas, funcionalmente idénticas o similares, a ambos lados del cartucho de grapas. Por tanto, puede preverse que haya dos canales periféricos 142 o dos canales 146.
En uso, cuando un primer extremo o parte 150 del miembro 140 de tensión sea hecho retraer, merced a medios adecuados, en la dirección indicada por la flecha "A", como se muestra en la figura 9, el conjunto de herramienta 100 girará en torno al miembro 122a de pivote en la dirección indicada por la flecha "D". Cuando un segundo extremo o parte 152 del miembro 140 de tensión sea hecho retraer en la dirección indicada por la flecha "B", el conjunto 100 de herramienta girará en la dirección indicada por la flecha "C". Cuando ambos extremos del miembro 140 de tensión sean hechos retraer simultáneamente, el miembro 140 de tensión hará avanzar el miembro 132 de sujeción dinámica, distalmente, en la ranura 144 del cartucho 114a, de modo que el miembro 132 de sujeción dinámica y la deslizadera 131 sean hechos avanzar en el cartucho 114a, con el fin de, mediante empujadores de aplicación, expulsar grapas del cartucho y cortar tejido en el espacio libre del tejido. Para evitar que el miembro 132 de sujeción dinámica avance en la ranura 144 cuando el conjunto de herramienta esté siendo hecho girar, es decir, cuando sólo un extremo del miembro 140 de tensión sea hecho retraer, puede preverse un dispositivo de bloqueo (no mostrado), por ejemplo, una espiga de corte, para evitar el movimiento del miembro de sujeción dinámica o retardarlo hasta que una fuerza predeterminada haya sido aplicada al miembro de sujeción dinámica. Está previsto que puedan emplearse múltiples miembros de tensión, por ejemplo, bandas, para realizar, respectivamente, funciones individuales o una combinación de funciones. Por ejemplo, pueden emplearse un par de miembros de tensión, uno para articular, y otro para aproximar, sujetar y disparar. Los miembros de tensión pueden fijarse en el miembro de sujeción dinámica, en el miembro que monte la cuchilla o en la combinación miembro de sujeción dinámica, miembro de cuchilla y/o miembro de deslizadera.
El conjunto de herramienta descrito en lo que antecede puede incorporarse en una unidad de carga desechable, tal como la descrita en la patente norteamericana nº 6.330.965, o unirse directamente con el extremo distal de cualquier dispositivo de grapado quirúrgico conocido. Aunque en este documento no se hayan descrito, específicamente, un conjunto de mango para accionar el miembro de aproximación y el mecanismo combinado de articulación y disparo, debe entenderse que está previsto el uso de una amplia diversidad de configuraciones diferentes de mecanismos de accionamiento y mangos, que incluyen clavijas, botones giratorios y deslizantes, palancas pivotantes o disparadores, empuñaduras de pistola, mangos en línea, sistemas accionados por control remoto y una combinación de los mismos. Puede preverse el uso de un conjunto de herramienta descrito en lo que antecede como parte de un sistema robotizado.
Los conjuntos de herramienta descritos en este documento tienen pares de mandíbulas e incluyen un mecanismo de aproximación singular que facilita una sujeción y una manipulación de tejido mejoradas.
Se entenderá que pueden realizarse distintas modificaciones en las realizaciones descritas en este documento. Por ejemplo, aunque esta aplicación se centre, principalmente, en el uso de grapas quirúrgicas, pueden incluirse en este dispositivo otros dispositivos de sujeción, tales como fijaciones de dos partes. En un dispositivo en el que se usen fijaciones de dos partes, cada una de las cavidades de formación de grapas del yunque pueden configurarse de modo que reciban una parte de la fijación de dos partes. Por otro lado, está previsto que las enseñanzas ofrecidas en esta descripción puedan incorporarse en dispositivos quirúrgicos que incluyan prensores, distintos a los dispositivos de grapado. Por tanto, la descripción que antecede no debe considerarse limitativa, sino simplemente como ilustrativa de realizaciones preferidas. Los expertos en la técnica podrán concebir otras modificaciones dentro del alcance de las reivindicaciones adjuntas a este documento.

Claims (16)

1. Un conjunto de herramienta (10), que comprende:
un par de mandíbulas, con una primera mandíbula (12) y una segunda mandíbula (14), presentando cada una de las mandíbulas un extremo proximal y un extremo distal, siendo movibles la primera y la segunda mandíbulas, una en relación con otra, entre una posición separada y una posición aproximada;
un primero (32) y un segundo (36) seguidores de leva, soportados en la primera o en la segunda mandíbulas; y
un miembro (16) de aproximación, que incluye, al menos, una superficie (28, 30) de leva destinada a aplicarse con el primero y el segundo seguidores de leva, siendo movible el miembro de aproximación con el fin de desplazar dicha, al menos, una superficie de leva en relación con el primero y el segundo seguidores de leva, presentando el miembro de aproximación una carrera de accionamiento que incluye partes inicial, segunda y final,
en el que el miembro (16) de aproximación puede ser hecho mover con el fin de desplazar dicha, al menos, una superficie de leva (28, 30) en relación con el primero y el segundo seguidores (32, 36) de leva para producir el movimiento de la primera y la segunda mandíbulas (12, 14) entre la posición separada y la posición aproximada, estando configurada dicha, al menos, una superficie de leva (28, 30), durante la parte inicial de la carrera de accionamiento, con el fin de aproximar los extremos distales de la primera y la segunda mandíbulas previamente a la aproximación de los extremos proximales de la primera y la segunda mandíbulas durante la segunda parte de la carrera de accionamiento, caracterizado porque:
durante la segunda parte de la carrera de accionamiento, los extremos distales de la primera y la segunda mandíbulas se separan, uno de otro, hasta una posición resultante en la que las mandíbulas sean paralelas,
y, después, durante la parte final de la carrera de accionamiento se acercan la primera y la segunda mandíbulas, entre sí, en relación de cierre sustancialmente paralelo, de modo que definan un espacio libre para el tejido.
2. Un conjunto de herramienta según la reivindicación 1, en el que la primera mandíbula incluye un yunque (12) y la segunda mandíbula incluye un conjunto (14) de cartucho, alojando el conjunto de cartucho una pluralidad de grapas.
3. Un conjunto de herramienta según las reivindicaciones 1 o 2, en el que dicha, al menos, una superficie de leva incluye, al menos, un canal (28, 30) de leva.
4. Un conjunto de herramienta según la reivindicación 3, en el que dicho, al menos, un canal de leva incluye un primero (28) y un segundo (30) canales de leva.
5. Un conjunto de herramienta según la reivindicación 1, en el que el miembro de aproximación (16) incluye una placa plana con dicha, al menos, una superficie (28, 30) de leva formada en ella.
6. Un conjunto de herramienta según la reivindicación 1, en el que la primera mandíbula incluye una ranura longitudinal (24) formada en su extremo proximal, estando el miembro (16) de aproximación posicionado, a deslizamiento, en la ranura longitudinal.
7. Un conjunto de herramienta según la reivindicación 6, en el que el primero y el segundo seguidores (32, 36) de leva están soportados en el extremo proximal (22) de la primera mandíbula (12) y se extienden a través de la ranura longitudinal adyacente a dicha, al menos, una superficie de leva.
8. Un conjunto de herramienta según la reivindicación 7, en el que dicha, al menos, una superficie de leva incluye un primero y un segundo canales de leva, extendiéndose el primer seguidor (32) de leva a través del primer canal (28) de leva, y extendiéndose el segundo seguidor (36) de leva a través del segundo canal (30) de leva.
9. Un conjunto de herramienta según la reivindicación 1, que incluye, además, una parte (120) de cuerpo, estando unido el conjunto de herramienta con la parte de cuerpo, de modo pivotante, mediante una unión articulada (122).
10. Un conjunto de herramienta según la reivindicación 9, en el que la parte (120) de cuerpo constituye el extremo distal de un dispositivo de grapado quirúrgico.
11. Un conjunto de herramienta según cualquiera de las reivindicaciones 1, 9 y 10, en el que la parte de cuerpo constituye la parte proximal de una unidad de carga desechable.
12. Un conjunto de herramienta según cualquiera de las reivindicaciones precedentes, que comprende una unidad de carga desechable.
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13. Un dispositivo quirúrgico, que comprende:
un conjunto (100) de herramienta según cualquiera de las reivindicaciones precedentes; y
un miembro (132) de sujeción dinámica asociado operativamente con la primera y la segunda mandíbulas (112, 114) y que puede ser hecho mover en relación con la primera y la segunda mandíbulas con el fin de accionar el conjunto de herramienta y mantener el espacio libre para el tejido entre la primera y la segunda mandíbulas en una posición adyacente al miembro de sujeción dinámica.
14. Un dispositivo quirúrgico según la reivindicación 13, en el que la primera mandíbula incluye un yunque (112) y la segunda mandíbula incluye un conjunto (114) de cartucho con una pluralidad de grapas, pudiendo ser hecho mover el miembro de sujeción dinámica en relación con el conjunto de cartucho para expulsar la pluralidad de grapas del conjunto de cartucho.
15. Un dispositivo quirúrgico según la reivindicación 14, en el que el miembro (132) de sujeción dinámica incluye una pestaña superior (134a) destinada a aplicarse, a deslizamiento, con el yunque (112), y una pestaña inferior (134b), destinada a aplicarse, a deslizamiento, con el conjunto (114) de cartucho.
16. Un dispositivo de grapado quirúrgico según la reivindicación 15, en el que el primero y el segundo seguidores (32, 36) de leva están soportados en un extremo proximal del yunque (112).
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US20110036893A1 (en) 2011-02-17
US7617961B2 (en) 2009-11-17
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US8292151B2 (en) 2012-10-23
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US20120091184A1 (en) 2012-04-19
US8091753B2 (en) 2012-01-10
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