ES2262639T3 - Obturador y divisor de vasos com miembros de tope n oconductivos. - Google Patents
Obturador y divisor de vasos com miembros de tope n oconductivos.Info
- Publication number
- ES2262639T3 ES2262639T3 ES01923220T ES01923220T ES2262639T3 ES 2262639 T3 ES2262639 T3 ES 2262639T3 ES 01923220 T ES01923220 T ES 01923220T ES 01923220 T ES01923220 T ES 01923220T ES 2262639 T3 ES2262639 T3 ES 2262639T3
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- bipolar forceps
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1442—Probes having pivoting end effectors, e.g. forceps
- A61B18/1445—Probes having pivoting end effectors, e.g. forceps at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
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- A—HUMAN NECESSITIES
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1482—Probes or electrodes therefor having a long rigid shaft for accessing the inner body transcutaneously in minimal invasive surgery, e.g. laparoscopy
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/03—Automatic limiting or abutting means, e.g. for safety
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
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- A61B17/32—Surgical cutting instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00535—Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated
- A61B2017/00539—Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated hydraulically
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B2017/2926—Details of heads or jaws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00059—Material properties
- A61B2018/00071—Electrical conductivity
- A61B2018/00077—Electrical conductivity high, i.e. electrically conducting
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- A—HUMAN NECESSITIES
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- A61B2018/00172—Connectors and adapters therefor
- A61B2018/00178—Electrical connectors
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- A61B2018/00184—Moving parts
- A61B2018/00196—Moving parts reciprocating lengthwise
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00345—Vascular system
- A61B2018/00404—Blood vessels other than those in or around the heart
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/0063—Sealing
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
- A61B2018/1246—Generators therefor characterised by the output polarity
- A61B2018/126—Generators therefor characterised by the output polarity bipolar
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- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B2018/1405—Electrodes having a specific shape
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- A—HUMAN NECESSITIES
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1442—Probes having pivoting end effectors, e.g. forceps
- A61B2018/1452—Probes having pivoting end effectors, e.g. forceps including means for cutting
- A61B2018/1455—Probes having pivoting end effectors, e.g. forceps including means for cutting having a moving blade for cutting tissue grasped by the jaws
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
- A61B2018/1861—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves with an instrument inserted into a body lumen or cavity, e.g. a catheter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/03—Automatic limiting or abutting means, e.g. for safety
- A61B2090/033—Abutting means, stops, e.g. abutting on tissue or skin
- A61B2090/034—Abutting means, stops, e.g. abutting on tissue or skin abutting on parts of the device itself
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- Surgical Instruments (AREA)
Abstract
Un forceps bipolar endoscópico (10) para obturar y dividir tejido, que comprende: - un árbol alargado (12) que tiene unos miembros de mordaza opuestos (22, 24) en un extremo distal (14) de él, cuyos miembros de mordaza son desplazables entre sí desde una primera posición, en la que dichos miembros de mordaza están dispuestos en relación espaciada entre sí, y una segunda posición en la que dichos miembros de mordaza cooperan para asir tejido (150) entre ellos; - una fuente de energía eléctrica conectada a cada uno de los miembros de mordaza, de modo que éstos sean capaces de conducir dicha energía a través del tejido para efectuar una obturación (152); - al menos dos miembros de tope no conductivos (50a-50g) dispuestos sobre una superficie que mira hacia dentro (34) de al menos uno de los miembros de mordaza, que controlan la distancia entre dichos miembros de mordaza cuando el tejido está sujeto entre ellos, y cuyos miembros de tope incluyen una serie de salientes orientados longitudinalmente que se extienden desde un extremo proximal (26) de dicho al menos uno de los citados miembros de mordaza hasta un extremo distal (28) de dicho al menos uno de los miembros de mordaza; y - una cuchilla (60) de movimiento alternativo longitudinal para cortar tejido próximo a la obturación.
Description
Obturador y divisor de vasos con miembros de
tope no conductivos.
La presente memoria descriptiva se refiere a un
instrumento electroquirúrgico PRIVATE para efectuar procedimientos
quirúrgicos endoscópicos. Más particularmente, esta memoria se
refiere a un fórceps electroquirúrgico bipolar endoscópico y a un
método de uso del mismo, que incluye miembros de tope no conductivos
asociados a uno o ambos miembros de mordaza opuestos. Los miembros
de tope no conductivos están diseñados para controlar la distancia
entre los miembros de mordaza opuestos, y mejorar la manipulación y
sujeción del tejido durante los procedimientos de obturación y
división.
El documento
EP-A-0 640 317 describe un fórceps
bipolar endoscópico para obturar y dividir tejido, que comprende un
árbol alargado que cuenta con unos miembros de mordaza opuestos
desplazables entre sí en su extremo distal, conectados a una fuente
de energía eléctrica, una cuchilla desplazable longitudinalmente de
modo alternativo, y unos miembros no conductivos dispuestos sobre
una superficie que mira hacia dentro de cada uno de los miembros de
mordaza.
Los fórceps endoscópicos utilizan la acción
mecánica para apretar, asir, diseccionar, y/o sujetar tejido. Dichos
fórceps electroquirúrgicos utilizan tanto la acción mecánica de
sujeción como la energía eléctrica para efectuar hemóstsis para el
caldeo del tejido y de los vasos sanguíneos, para coagular,
cauterizar, y/o obturar el tejido.
Los instrumentos endoscópicos son insertados
dentro del paciente a través de un cánula u orificio, hecho con un
trocar o dispositivo similar, Los tamaños típicos de las cánulas
están dentro de un margen de tres a doce milímetros. Por lo general
se prefieren cánulas más pequeñas, lo que representa un desafío en
cuanto al diseño para los fabricantes de estos instrumentos, que
deben hallar maneras para que los instrumentos quirúrgicos ajusten a
través de las cánulas.
Cierto procedimientos quirúrgicos endoscópicos
requieren el corte de vasos sanguíneos o de tejido vascular. Sin
embargo, debido a limitaciones de espacio, los cirujanos pueden
hallar dificultades en la sutura de vasos o en la ejecución de otros
métodos tradicionales para el control del sangrado, por ejemplo,
sujeción y/o atadura de vasos sanguíneos cortados. Los vasos
sanguíneos, dentro de un margen inferior a dos milímetros de
diámetro, pueden ser cerrados con frecuencia con el uso de técnicas
electroquirúrgicas estándar. No obstante, si es cortado un vaso
mayor, puede ser necesario para el cirujano convertir el
procedimiento endoscópico en un procedimiento quirúrgico abierto, y
abandonar así los beneficios de la laparoscopia.
Varios artículos en revistas han descrito
métodos para obturar pequeños vasos sanguíneos con el uso de la
electrocirugía. Un artículo titulado "Estudios sobre coagulación y
desarrollo de un coagulador bipolar computerizado automático", de
la revista J. Neurosurg, vol, 75, Julio de 1991, describe un
coagulador bipolar que es utilizado para obturar pequeños vasos
sanguíneos. El artículo expone que no es posible coagular con
seguridad arterias con diámetro superior a un margen de 2 a 2,6 mm.
Un segundo artículo titulado "Electrocoagulación bipolar
controlada automáticamente" - "COA-COMP",
Rev. de Neurosurg. (1984), págs. 187-190, describe
un método para cortar el suministro de potencia electroquirúrgica
al vaso, de modo que pueda ser evitado el chamuscamiento de las
paredes de él.
Como antes se ha dicho, mediante la utilización
de fórceps electroquirúrgicos, un cirujano puede cauterizar,
coagular/desecar, y/o simplemente reducir un sangrado lento,
mediante el control de la intensidad, la frecuencia, y la duración
de la energía electroquirúrgica aplicada al tejido a través de
miembros de mordaza. El electrodo de cada miembro de mordaza es
cargado con un potencial eléctrico diferente, de modo que cuando los
miembros de mordaza asen el tejido, energía eléctrica puede ser
transferida selectivamente a través de dicho tejido.
Con objeto de efectuar una obturación apropiada
en vasos mayores, dos parámetros mecánicos predominantes deben ser
controlados con precisión: la presión aplicada al vaso, y la
distancia de separación entre los electrodos, cuyos dos factores
resultan afectados por el grosor del vaso obturado. Más
particularmente, es importante una aplicación precisa de la presión
a las paredes opuestas del vaso, para reducir la impedancia del
tejido a un valor suficientemente bajo que permita el paso de una
suficiente energía electroquirúrgica a través del tejido para vencer
las fuerzas de expansión durante el caldeo del tejido, y contribuir
así a un grosor final del tejido que sea una indicación de una
buena obturación. Se ha determinado que una pared de vaso fundida
típica es óptima entre 25,4 \mum y 127 \mum). Por debajo de este
margen, la obturación puede despedazarse o rasgarse, y por encima de
él, los lúmenes pueden no resultar obturados de manera adecuada o
efectiva.
Los métodos electroquirúrgicos pueden ser
capaces de obturar vasos mayores con el uso de una curva de potencia
electroquirúrgica apropiada, acoplada a un instrumento capaz de
aplicar una gran fuerza de cierre a las paredes del vaso. Esa es la
idea por la que el procedimiento de obturar vasos pequeños es
fundamentalmente diferente a la obturación electrogirúrgica de
vasos. A los fines aquí presentes, "coagulación" se define como
un procedimiento de desecación de tejido en el que las células de
dicho tejido son rotas y secadas. La obturación de un vaso se define
como el procedimiento de licuar el colágeno en el tejido, de modo
que se reforme en una masa fundida. Por tanto, la coagulación de
vasos pequeños es suficiente para cerrarlos permanentemente. Los
vasos mayores necesitan ser obturados para asegurar un cierre
permanente.
Las patentes de EE.UU. núms. 2.176.479 de
Willis; 4.005.714 y 4.031.898 de Hiltebrandt; 5.826.274, 5.289.287,
y 5.312.433 de Boebel y col.; 4.370.980, 4.552.143, 5.026.370, y
5.116.332 de Lottick; 5,443,463 de Stern y col.; 5.484.436 de Eggers
y col.; y 5.951.549 de Richardson y col., se refieren todas a
instrumentos electroquirúrgicos para coagulación, corte, y/o
obturación de vasos o tejido. No obstante, algunos de estos diseños
pueden proporcionar al vaso sanguíneo una presión no reproducible
uniformemente, y pueden dar por resultado una obturación inefectiva
o no uniforme.
En su mayor parte, estos instrumentos se basan
sólo en la presión de sujeción para producir un grosor de obturación
apropiado, y no están diseñados para tener en cuenta las tolerancias
de hueco y/o de paralelismo, y los requerimientos de aplanamiento,
que son parámetros que sin son debidamente controlados pueden
asegurar una obturación del tejido uniforme y efectiva. Por ejemplo,
es sabido que es difícil controlar adecuadamente el grosor del
tejido obturado resultante mediante el control de la presión de
sujeción solamente, por cualquiera de estas dos razones: 1) si se
aplica demasiada fuerza existe la posibilidad de que los dos polos
se toquen, y que no sea transferida energía a través del tejido, de
lo que resulta una obturación inefectiva; o 2) se se aplica una
fuerza demasiado baja, el tejido puede moverse prematuramente antes
de la activación, y puede ser creada una obturación más gruesa y
menos fiable.
Típicamente y en particular con respecto a
procedimientos electroquirúrgicos endoscópicos, una vez obturado un
vaso, el cirujano tiene que retirar el instrumento de obturación del
lugar de la operación, sustituirlo por un nuevo instrumento a través
de la cánula, y cortar con precisión el vaso a través de la
obturación del tejido recién formada. Como puede apreciarse, esta
operación adicional puede consumir tiempo (en particular cuando se
obtura un número significativo de vasos) y puede contribuir a una
separación imprecisa del tejido a lo largo de la línea de
obturación, debido a la falta de obturación o defecto de colocación
del instrumento de corte a lo largo del centro de la línea de
obturación del tejido.
Se han hecho varios intentos por diseñar un
instrumento que incorpore un miembro de hoja o cuchilla que corte
con efectividad el tejido después de formar una obturación en él.
Por ejemplo, la patente de EE.UU. núm. 5.674.220 de Fox y col,
describe un instrumento transparente de obturación de vasos que
incluye una cuchilla de movimiento alternativo longitudinalmente,
que corta el tejido una vez obturado. El instrumento incluye una
pluralidad de aberturas que permiten la visualización directa del
tejido durante el procedimiento de obturación y corte. Dicha
visualización directa permite que un usuario regule de modo visual y
manual la fuerza de cierre y la distancia del hueco entre los
miembros de mordaza, para reducir y/o limitar que se produzcan
ciertos efectos indeseables que se sabe se producen cuando se
obturan vasos, expansión térmica, chamuscamiento, etc. Como puede
apreciarse, el éxito general de la obturación de un tejido con este
instrumento se basa en gran medida en la maestría, visión, destreza,
y experiencia del usuario al estimar la fuerza de cierre apropiada,
distancia de separación, y longitud del movimiento alternativo de la
cuchilla, para obturar de modo uniforme, consistente, y efectivo el
vaso, y separar el tejido en la obturación.
La patente de EE.UU. núm. 5.702.390 de Austin y
col, describe un instrumento de obturación de vaso que incluye un
electrodo de forma triangular que es giratorio desde una primera
posición de obturación del tejido, a una segunda posición para
cortarlo. De nuevo, el usuario debe fiarse de la visualización
directa y de su destreza, para controlar los diversos efectos de la
obturación y corte del tejido.
Por tanto, existe la necesidad de desarrollar un
instrumento electroquirúrgido endoscópico que de modo efectivo y
uniforme obture y separe el tejido vascular, y resuelva los
problemas antes citados. Este instrumento regula las distancias del
hueco entre miembros de mordaza opuestos, reduce las posibilidades
de cortocircuitar dichas mordazas opuestas durante la activación, y
ayuda a la manipulación, asido, y sujeción del tejido antes y
durante la activación y separación de dicho tejido.
La presente invención se define en la
reivindicación 1, más adelante, y se refiere a un fórceps
electroquirúrgico bipolar endoscópico para sujetar, obturar, y
dividir el tejido. El fórceps incluye un árbol alargado que cuenta
con unos miembros de mordaza opuestos en un extremo distal de él.
Los miembros de mordaza son desplazables entre sí desde una primera
posición, en relación espaciada de uno frente al otro, a una segunda
posición en la que dichos miembros de mordaza cooperan para asir el
tejido entre ellos. Una fuente de energía electroquirúrgica está
conectada a los miembros de mordaza, de modo que éstos sean capaces
de conducir energía a través del tejido sujeto entre ellos, para
efectuar la obturación de dicho tejido. Al menos un miembro de tope,
no conductivo y separado, está dispuesto sobre una superficie que
mira hacia el interior de al menos uno de los miembros de mordaza, y
está situado para controlar la distancia de separación entre los
miembros de mordaza opuestos cuando el tejido es sujetado entre
ellos. Una cuchilla, de desplazamiento alternativo longitudinal,
corta el tejido en proximidad al lugar de la obturación, una vez
formada una obturación efectiva. El fórceps incluye al menos dos
miembros de tope dispuestos como una serie de proyecciones
orientadas longitudinalmente, que se extienden a lo largo de la
superficie orientada hacia dentro, desde el extremo proximal hacia
el extremo distal y del miembro de mordaza.
Una realización del fórceps que aquí se describe
incluye un conjunto de vástago de accionamiento que conecta los
miembros de mordaza con la fuente de energía eléctrica, de modo que
el primer miembro de mordaza tenga un primer potencial eléctrico, y
el segundo miembro de mordaza tenga un segundo potencial eléctrico.
Con preferencia, una empuñadura está acoplada mecánicamente al
conjunto de vástago de accionamiento, e imparte movimiento entre sí
a los miembros de mordaza primero y segundo. Con preferencia, el al
menos un miembro de tope no conductivo está separado.
En una realización de la presente invención, uno
de los miembros de mordaza incluye una superficie eléctricamente
conductiva, que tiene un canal orientado longitudinalmente definido
en él, que facilita el desplazamiento alternativo longitudinal de la
cuchilla para el corte del tejido, en proximidad al lugar de
obturación de dicho tejido. Preferiblemente, el fórceps incluye un
disparador para accionar la cuchilla, que es accionable con
independencia del conjunto de accionamiento.
En otra realización, los miembros de tope
incluyen una serie de lengüetas a modo de círculo, que sobresalen
desde la superficie que mira hacia el interior y se extienden desde
el extremo proximal hasta el extremo distal del miembro de mordaza.
Los miembros de tope pueden estar dispuestos en cualquier miembro de
mordaza opuesto, y en los lados opuestos del canal orientado
longitudinalmente, y/o en una manera alternativa, descentrados
lateralmente entre sí a todo lo largo de la superficie de uno
cualquiera o de ambos miembros de mordaza.
En otra realización de la presente memoria
descriptiva, un borde elevado está dispuesto para actuar como
miembro de tope, que sobresale desde la superficie enfrentada hacia
dentro y se extiende en torno a la periferia exterior del miembro de
mordaza, para controlar la distancia del hueco entre los miembros de
mordaza opuestos. En otra realización, al menos una cresta orientada
longitudinalmente se extiende desde el extremo proximal hasta el
extremo distal de uno de los miembros de mordaza, y controla la
distancia de separación entre los miembros de mordaza.
Preferiblemente, los miembros de tope están
fijos o unidos al miembro o miembros de mordaza mediante
estampación, pulverización térmica, sobremoldeo, y/o por medio de un
adhesivo. Los miembros de tope sobresalen desde aproximadamente 25,4
\mum a aproximadamente 127 \mum, y preferiblemente desde
aproximadamente 50,8 \mum a aproximadamente 76,2 \mum, desde la
superficie enfrentada hacia dentro de al menos uno de los miembros
de mordaza. Está previsto que los miembros de tope puedan ser hechos
de un material aislante, tal como parileno, nilón, y/o cerámica. Se
contemplan también otros materiales, por ejemplo, poliestirenos
sindiotácticos, tales como QUESTRA® fabricado por DOW CHEMICAL,
poliestireno sindiotáctico (SPS), poli(tereftalado de
butileno) (PBT), policarbonato (PC), acrilonitrilo butadieno
estireno (ABS), poliftalamida (PPA), poliamida,
poli(tereftalato de etileno) (PET),
poliamida-imida (PAI), acrílico (PMMA), poliestireno
(PS y HIPS). Poli(etersulfona) (PES), poli(quetona
alifática), copolímero de acetal (POM), poliuretano (PU y YPU),
nilón con dispersión de poli(óxido de fenileno), y acrilato de
acrilonitrilo estireno.
Se describe un método para obturar y dividir
tejido, que puede incluir la operación de disponer un fórceps
bipolar endoscópico, que a su vez incluye:
- un árbol alargado que cuenta con unos
miembros de mordaza opuestos en su extremo distal, que deben
cooperar para asir un tejido entre ellos;
- al menos un miembro de tope no conductivo y
separado, dispuesto sobre una superficie enfrentada al interior de
al menos uno de los miembros de mordaza, que controla la distancia
entre dichos miembros de mordaza cuando h ay tejido sujeto entre
ellos: y
- una cuchilla.
El método puede incluir también las operaciones
de conectar los miembros de mordaza a una fuente de energía
eléctrica; accionar dichos miembros de mordaza para asir tejido
entre los citados miembros opuestos: conducir energía a los miembros
de mordaza a través del tejido sujeto entre ellos para efectuar una
obturación; y accionar la cuchilla para cortar el tejido en
proximidad a la obturación.
Preferiblemente, al menos uno de los miembros de
mordaza de la operación de proporcionar el fórceps incluye una
superficie eléctricamente conductiva, que tiene un canal orientado
longitudinalmente definido en él, que facilita la actuación de la
cuchilla en una acción de movimiento alternativo longitudinal dentro
del canal, para cortar el tejido.
Varias realizaciones del instrumento
reivindicado se describen aquí con referencia a los dibujos, en los
que:
- la fig. 1 es una vista en perspectiva de un
fórceps endoscópico que muestra una empuñadura y un accionador de
acuerdo con la presente invención;
- la fig. 2 es una vista parcial de un corte
transversal del fórceps de la fig. 1, que muestra los componentes
internos de trabajo de la empuñadura, y el accionador de extremo en
configuración cerrada;
- la fig. 3 es una vista en perspectiva ampliada
del conjunto accionador de extremo, mostrado en configuración
abierta;
- la fig. 4 es una vista lateral muy ampliada de
un extremo proximal del accionador de extremo de la fig. 3;
- la fig. 5 es una vista en perspectiva muy
ampliada de un extremo distal del accionador de extremo de la fig.
3, que muestra una cuchilla y una serie de miembros de tope
dispuestos a lo largo de una superficie enfrentada hacia dentro de
un miembro de mordaza;
- las figs. 6A a 6F muestran varias
configuraciones de los miembros de tope sobre la superficie que mira
hacia dentro de uno de los miembros de mordaza;
- la fig. 7 es una vista en perspectiva ampliada
de un lugar de obturación de un vaso tubular;
- la fig. 8 es un corte transversal longitudinal
del lugar de obturación, tomado a lo largo de la línea
B-B de la fig. 7;
- la fig. 9 es un corte transversal longitudinal
del lugar de obturación de la fig. 7, después de la separación del
vaso tubular.
Con referencia ahora a las figs. 1 a 5, se
muestra una realización de un fórceps bipolar endoscópico 10 para
uso con varios procedimientos quirúrgicos, e incluye un conjunto 80
de alojamiento y empuñadura, que tiene un accionador de extremo 20
unido a él. Más particularmente, el fórceps 10 incluye un árbol 12
que cuenta con un extremo distal 14 dimensionado para acoplarse
mecánicamente al conjunto 20 accionador de extremo, y un extremo
proximal 16 que se acopla mecánicamente al conjunto 80 de
alojamiento y empuñadura. En los dibujos y en las descripciones que
siguen, el término "proximal", como es tradicional, se refiere
al extremo del fórceps 10 que está más próximo al usuario, y el
término "distal" se refiere al extremo que está más alejado del
usuario.
El conjunto 20 accionador de extremo está unido
al extremo distal 14 del árbol 12, e incluye un par de miembros de
mordaza opuestos 22 y 24. Preferiblemente, el conjunto 80 de
alojamiento y empuñadura están unidos al conjunto proximal 16 del
árbol 12, e incluyen unos mecanismos de activación dispuestos
interiormente, por ejemplo, una empuñadura móvil 82 y un conjunto de
accionamiento 70, que cooperan mecánicamente para impartir
movimiento a los miembros de mordaza 22 y 24 desde una posición
abierta, en la que dichos miembros de mordaza 22 y 24 están
dispuestos en relación espaciada entre sí, a una posición cerrada o
de sujeción en la que dichos miembros 22 y 24 cooperan para asir un
tejido 150 (fig. 7) entre ellos.
Está previsto que el fórceps 10 pueda ser
diseñado de modo que sea toral o parcialmente desechable, en función
de una finalidad particular o para conseguir un resultado
particular. Por ejemplo, el conjunto accionador de extremo 20 puede
ser selectiva y liberablemente acoplable al extremo distal 14 del
árbol 12, y/o el extremo proximal 16 del árbol puede ser acoplable
de modo selectivo y liberable al alojamiento y conjunto 80 de
empuñadura. En cualquiera de estos dos casos, el fórceps 10 debe ser
considerado "parcialmente desechable", es decir, que un nuevo y
diferente conjunto 20 accionador de extremo (o conjunto 20
accionador de extremo y árbol 12) reemplaza al viejo conjunto 20
cuando se necesite.
Las figuras 1 y 2 muestran los elementos
operativos y los componentes internos de trabajo del alojamiento y
conjunto 90 de empuñadura, que a los fines de la presente invención
se describen aquí en general. Las funciones específicas y relaciones
operativas de estos elementos, y los diversos componentes internos
de trabajo, se describen con más detalle en el documento
EP-A-1 372 510, titulado
"Obturador y divisor de vasos" de Dycus y col., que no
constituye técnica anterior en el sentido del Art. 54, etc.
Como se aprecia mejor en la fig. 2, el conjunto
80 de alojamiento y empuñadura incluyen una empuñadura desplazable
82 y una empuñadura fija. La empuñadura desplazable 82 incluye una
abertura 89 definida a su través, que permite al usuario asir y
mover la empuñadura 82 con relación a la empuñadura fija 84. La
empuñadura desplazable 82 es selectivamente móvil en torno a un
pivote 87 desde una primera posición con relación a la empuñadura
fija 84, a una segunda posición en proximidad inmediata a la
empuñadura fija 84, que como se explica más adelante imparte un
movimiento relativo entre sí a los miembros de mordaza 22 y 24.
Más particularmente, el conjunto 80 de
alojamiento y empuñadura aloja un conjunto de alojamiento 70 que
coopera con la empuñadura móvil 82 para impartir el movimiento de
los miembros de mordaza 22 y 24 desde una posición abierta, en la
que dichos miembros están dispuestos en relación espaciada entre sí,
a una posición de sujeción o cerrada, en la que dichos miembros de
mordaza 22 y 24 cooperan para asir tejido 150 (fig. 7) entre ellos.
Los parámetros operativos generales del conjunto de accionamiento 70
y los componentes de trabajo del mismo, son explicados de manera más
generalizada más adelante, y son explicados con detalle especifico
en la solicitud antes citada también pendiente "Obturador y
divisor de vaso". A los fines de la presente memoria
descriptiva, el alojamiento y el conjunto de empuñadura 80 pueden
ser caracterizados en general como una conexión mecánica de cuatro
barras compuesta de los siguientes elementos: empuñadura móvil 82,
enlace 73, enlace a modo de leva 76, y enlace de base,
materializados por los puntos de pivotar fijos 75 y 76. El
movimiento de la empuñadura 82 activa la conexión de cuatro barras,
que a su vez acciona el conjunto de accionamiento 70 para impartir
el movimiento de los miembros de mordaza opuestos 22 y 24 entre sí
para asir tejido 150 entre ellos. Está previsto que el empleo de una
conexión mecánica de cuatro barras permita al usuario ganar una
ventaja mecánica significativa cuando se comprimen los miembros de
mordaza 22 y 24 contra el tejido 150, como se explica en detalle
más adelante con respecto a los parámetros operativos descritos en
general del conjunto de accionamiento 70.
Preferiblemente, la empuñadura fija 84 incluye
un canal 85 definido en ella, que está dimensionado para recibir una
pestaña 83 que se extiende proximalmente desde la empuñadura móvil
82. Preferiblemente, la pestaña 83 incluye un extremo fijo 90 que
está unido a la empuñadura móvil 82, y un extremo libre 92 que está
dimensionado para una fácil recepción dentro del canal 85 de la
empuñadura 84. Está previsto que la pestaña 83 pueda ser
dimensionada para permitir al usuario mover los miembros de mordaza
22 y 24 entre sí de manera selectiva, progresiva, e
incrementalmente, desde la posición abierta a la posición cerrada.
Por ejemplo, se contempla también que la pestaña 83 pueda incluir
una interfaz a modo de carraca, que se acople de modo bloqueable a
la empuñadura móvil 83, y con ello los miembros de mordaza 22 y 24
en posiciones incrementales selectivas entre sí, en función de una
finalidad particular. Pueden ser empleados también otros mecanismos
para controlar y/o limitar el movimiento de la empuñadura 82 con
respecto a la empuñadura 84 (y los miembros de mordaza 22 y 24)
tales como, por ejemplo, sistemas hidráulicos, semihidráulicos, y de
engranajes.
Como puede ser apreciado en la presente memoria
descriptiva, y es explicado con más detalle en la Solicitud antes
mencionada, del mismo cesionario que ésta y también pendiente
"Obturador y divisor de vaso", el canal 85 de la empuñadura
fija 84 incluye un camino de entrada 91 y un pasaje de salida 95
para la reciprocidad de la pestaña 83. Como se aprecia mejor en la
fig, 2, al moverse la empuñadura 82 en modalidad en general
pivotante hacia la empuñadura fija 84 en torno al pivote 87, el
enlace 74 gira en torno a un pasador de guía 74 dispuesto dentro de
la empuñadura 82. Como resultado, en enlace 73 gira aproximadamente
en torno a un pivote 76. Como puede ser apreciado, el camino de
pivotar de la empuñadura 82 con relación a la empuñadura fija 84
empuja el enlace 76 a modo de leva para girar en torno al pivote 75
en una dirección en general proximal. El movimiento del enlace a
modo de leva 76 imparte movimiento al conjunto de accionamiento 70,
como se explica más adelante.
Como se aprecia mejor en la fig. 2, al
producirse el movimiento inicial de la empuñadura 82 hacia la
empuñadura fija 84, el extremo libre 92 de la pestaña 83 se mueve en
general proximalmente y hacia arriba a lo largo del camino de
entrada 91, hasta que el extremo 82 rebasa o se acopla mecánicamente
al miembro de carril 97 dispuesto a lo largo del camino 91, Está
previsto que el carril 97 permita el movimiento de la pestaña 83
proximalmente, hasta el punto en el que el extremo 92 libra el
carril 97, Una vez que el extremo 92 libra dicho carril 97, el
movimiento distal de la empuñadura 82 y la pestaña 83, es decir, la
liberación, es redirigida por el carril 97 dentro del camino de
salida 95.
Más particularmente, a la liberación de la
presión inicial, es decir, a la reducción de la presión de cierre de
la empuñadura 82 contra la empuñadura 84, la empuñadura 82 retorna
distalmente de modo escaso hacia el camino 81, pero es dirigida
hacia el camino de salida 95. En este punto, la liberación de la
presión de retorno entre las empuñaduras 82 y 84, que es atribuible
y directamente proporcional a la presión de liberación asociada a la
compresión del conjunto 70 de accionamiento (que se expone más
adelante), hace que el extremo 92 de la pestaña 83 se fije o
bloquee dentro de un hueco de retención 93. La empuñadura 82 está
ahora sujeta en su sitio dentro de la empuñadura 84, que a su vez,
bloquea los miembros de mordaza 22 y 24 en una posición cerrada
contra el tejido. El instrumento está ahora situado para la
aplicación selectiva de energía electroquirúrgica para la formación
de la obturación 152 en el tejido. De nuevo, los diversos elementos
operativos y sus funciones relevantes son explicados con más detalle
en la solicitud antes citada, del mismo cesionario que ésta y
también pendiente "Obturador y divisor de vasos".
Como se aprecia mejor en la fig. 2, la
reiniciación o el asido de nuevo de la empuñadura 82, mueve la
pestaña 83 en general proximalmente a lo largo del nuevo camino de
salida redirigido 95, hasta que el extremo 92 libera un reborde 94
expuesto a lo largo del camino de salida 95. Una vez que el reborde
94 está suficientemente despejado, la empuñadura 82 y la pestaña 83
son total y libremente liberables de la empuñadura 84 a lo largo del
camino de salida 95 a la reducción de la presión de asir, que a su
vez retorna los miembros de mordaza 22 y 24 a la posición abierta y
preactivada.
Como antes se ha dicho, el conjunto 80 de
alojamiento y empuñadura aloja un conjunto 70 de accionamiento que
coopera con la empuñadura móvil 82, para impartir un movimiento
relativo de los miembros de mordaza 22 y 24 para asir el tejido 150.
El funcionamiento del conjunto 70 de vástago de accionamiento y de
los diversos componentes de trabajo del conjunto de accionamiento 70
son explicados en detalle en la solicitud antes citada, del mismo
cesionario que ésta y también pendiente "Obturador y divisor de
vasos".
En general, y a los fines de la presente memoria
descriptiva, el conjunto de accionamiento 70 incluye un resorte de
compresión 72, un vástago de accionamiento 40, y un manguito de
compresión 98 (fig. 2). Como se aprecia mejor en la vista ampliada
de la fig. 4, el vástago de accionamiento 40 es desplazable
telescópica e interiormente dentro de un manguito 48 de la cuchilla.
El movimiento del vástago de accionamiento 40 con relación al
manguito de la cuchilla 48 imparte movimiento a los miembros de
mordaza 22 y 24. Un miembro de lengüeta 46 está dispuesto en el
extremo libre 42 del vástago de accionamiento 40, que define una
muesca 43 entre la lengüeta 46 y el extremo 42. La lengüeta 46 y la
muesca 43 cooperan mecánicamente con el resorte de compresión 72
para impartir movimiento al árbol 40 con relación al manguito 49 de
cuchilla, lo que a su vez abre y cierra los miembros de mordaza 22 y
24 en torno al tejido 150.
Como antes se ha expuesto, el movimiento del
conjunto 80 de empuñadura por medio de la conexión de cuatro barras,
hace finalmente que el enlace a modo de leva 76 gire en general en
sentido a la derecha en torno al pivote 75 (es decir,
proximalmente), que a su vez comprime el resorte 72 proximalmente
contra una pestaña 77 dispuesta dentro de la porción superior de la
empuñadura fija 84, A su vez, el movimiento del resorte 72 mueve el
vástago de accionamiento 49 con relación al manguito 48 de la
cuchilla, que mueve los miembros de mordaza opuestos 22 y 24 entre
sí. Como puede apreciarse, la ventaja mecánica significativa
asociada a la conexión de cuatro barras permite una fácil,
consistente, y uniforme compresión del resorte 72, que a su vez
permite una fácil, consistente, y uniforme compresión de los
miembros de mordaza 22 y 24 en torno al tejido 150. Otros detalles
y ventajas de la conexión mecánica de cuatro barras se expone con
más amplitud en la solicitud antes mencionada del mismo cesionario
que ésta y también pendiente "Obturador y divisor de
vasos".
Una vez asido el tejido 150 entre los miembros
de mordaza opuestos 22 y 24, energía electroquirurgica puede ser
suministrada a dichos miembros 22 y 24 a través de una interfaz
electroquirúrgica 110 dispuesta dentro de la empuñadura 64. De nuevo
ha de decirse que estas características están explicadas con más
detalle en la solicitud antes citada "Obturador y divisor de
vasos".
El fórceps 10 incluye también un disparador 86
que desplaza alternativamente el manguito de cuchilla 48, que a su
vez desplaza alternativamente una cuchilla 60 dispuesta dentro del
conjunto accionador de extremo 20 como se expone más adelante (fig.
5). Una vez formada la obturación 152 del tejido (fig. 7), el
usuario puede activar el disparador 86 para separar el tejido 150,
como se muestra en la fig. 9, a lo largo de la citada obturación
152. Como puede apreciarse, la cuchilla de desplazamiento
alternativo permite al usuario separar rápidamente el tejido 150
inmediatamente después de la obturación, sin sustituir un
instrumento de corte a través de la cánula o trocar (no mostrados).
Esta previsto que la cuchilla 60 facilite también una separación
más precisa del vaso 150 a lo largo de un plano de corte ideal
"B-B" asociado a la obturación 152 de tejido
formada recientemente (véanse las figs. 7 a 9). La cuchilla 60
incluye preferiblemente un borde aguzado 62 para cortar el tejido
150 sostenido entre los miembros de mordaza 22 y 24 en el lugar de
la obturación 152 (fig. 7). Está previsto que la cuchilla 60 pueda
ser acoplada también a la fuente de energía electroquirúrgica, para
facilitar la separación del tejido 150 a lo largo de la obturación
162.
Preferiblemente y como se explica con más
detalle en la solicitud mencionada anteriormente "Obturador y
divisor de vasos", el conjunto de empuñadura 80 puede incluir
también un mecanismo de bloqueo (no mostrado) que impida la
activación del disparador 86 hasta que los miembros de mordaza 22 y
24 estén cerrados, y se hallen cerrados sustancialmente en torno al
tejido 150. Por ejemplo, y como se aprecia mejor en la fig. 2, el
camino de salida 95 puede estar dimensionado de modo que el
disparador 86 se active sólo cuando la pestaña 83 esté dispuesta en
una posición predefinida o predeterminada, que proporcione
suficiente holgura para la activación del disparador 86, por
ejemplo, asentada dentro de un hueco de captación 93. Está previsto
que la configuración del conjunto de empuñadura 80 de este modo
pueda reducir las posibilidades de activación prematura del
disparador 86, antes de la activación electroquirúrgica y la
obturación.
Un conjunto giratorio 88 puede ser incorporado
también con el fórceps 10. Preferiblemente, el conjunto giratorio 88
está asociado mecánicamente al árbol 12 y al conjunto de
accionamiento. Como se aprecia mejor en la fig. 4, el árbol 12
incluye una abertura 44 situada en él, que establece una interfaz
mecánica con el correspondiente retenedor (no mostrado) fijo al
conjunto giratorio 88, de modo que el movimiento giratorio del
conjunto giratorio 88 imparta un movimiento rotatorio similar al
árbol 12, que a su vez gira el conjunto 20 accionador de extremo en
torno a un eje longitudinal "A". Estas características, junto
con la configuración eléctrica única para la transferencia de
energía electroquirúrgica a través del conjunto de empuñadura 80, el
conjunto giratorio 88, y el conjunto de accionamiento 70, se
describen con más detalle en la repetidamente citada solicitud del
mismo cesionario que ésta y también pendiente "Obturador y divisor
de vasos".
Como se aprecia mejor en las figs. 3, 5, y 6A a
6F, el conjunto 20 accionador de extremo se une al extremo distal 14
del árbol 12. Dicho conjunto 20 incluye el primer miembro de mordaza
22, el segundo miembro de mordaza 24, y la cuchilla 60 de movimiento
alternativo dispuesta entre aquéllas. Los miembros de mordaza 22 y
24 son pivotables preferiblemente en torno a un pivote 37 desde las
posiciones abierta a cerrada, al producirse el movimiento
alternativo relativo, es decir, el movimiento longitudinal, del
vástago de accionamiento 42 como antes se ha dicho. De nuevo ha de
decirse que las relaciones operativas con respecto a los diversos
elementos móviles del conjunto 20 accionador del extremo se
describen con detalle en la ya citada solicitud "Obturador y
divisor de vasos".
Cada una de los miembros de mordaza incluye una
superficie obturadora 35 eléctricamente conductiva, dispuesta en la
superficie enfrentada hacia dentro 34 de aquéllos, y un aislador 30
dispuesto sobre una superficie 39 que mira hacia fuera de ellos.
Está previsto que las superficies conductoras eléctricamente 35
cooperen para obturar el tejido 150 sostenido entre ellas al aplicar
la energía electroquirúrgica. Los aisladores 30, juntamente con las
superficies exteriores no conductivas 35 de los miembros de mordaza
22 y 24, están dimensionados preferiblemente para limitar y/o
reducir muchos de los defectos indeseables conocidos relacionados
con la obturación de tejidos, por ejemplo, formación de arco,
expansión térmica. y disipación de corrientes de fuga.
Está previsto que las superficies obturadoras
conductivas eléctricamente 35 puedan incluir también superficies
bien igualadas que faciliten el acoplamiento seguro de la superficie
eléctricamente conductiva 35 al aislador 30, y que simplifiquen
también el procedimiento general de fabricación. Está previsto que
la superficie obturadora eléctricamente conductiva 35 pueda incluir
también un borde periférico exterior que tenga un radio, y que el
aislador 30 se junte a la superficie obturadora 35 eléctricamente
conductiva a lo largo de un borde de unión que en general sea
tangencial al radio y/o se encuentre a lo largo del radio.
Preferiblemente, en la interfaz, la superficie eléctricamente
conductiva 35 está elevada con relación al aislador 30. Estas y
otras realizaciones contempladas son expuestas en el documento
EP-A-1 372 506, titulado
"Instrumento electroquirúrgico que reduce los daños colaterales en
tejidos adyacentes", de Jonson y col, y en el
EP-A-1 372 487 titulado
"Instrumento electroquirúrgico diseñado para reducir la incidencia
del arco eléctrico" de Jonson y col., los cuales no son técnica
anterior en el sentido del Artº 54, etc.
Preferiblemente, al menos una de las superficies
eléctricamente conductivas 35 de los miembros de mordaza, por
ejemplo el 22, incluye un canal 36 orientado longitudinalmente
definido en ella, que se extiende desde un extremo proximal 26 a un
extremo distal 28 del miembro de mordaza 22, Está previsto que el
canal 36 facilite el desplazamiento alternativo longitudinal de la
cuchilla 60 a lo largo de un plano de corte preferido
"B-B", para separar de modo efectivo y seguro
el tejido 150 a lo largo de la obturación de tejido formada 152
(véanse las figs. 7 a 9). Preferiblemente y como se explica en
detalle en la solicitud antes mencionada "Obturador y divisor de
vasos", los miembros de mordaza 22 y 24 del conjunto 20
accionador de extremo están aislados eléctricamente entre sí, de
modo que energía electroquirúrgica pueda ser transferida de modo
efectivo a través del tejido 150, para formar el obturador 152.
Como antes se ha dicho, al moverse la empuñadura
82, los miembros de mordaza 22 y 24 se juntan y asen tejido 150. En
este punto, la pestaña 83 queda retenida dentro del espacio captor
93, que junto con la ventaja mecánica asociada al mecanismo de
cuatro barras y al resorte 70, mantiene una fuerza axial
proporcional sobre el vástago de accionamiento 40, que a su vez
mantiene una fuerza compresiva entre los miembros de mordaza
opuestos 22 y 24 contra el tejido 150, Esta previsto que el conjunto
accionador 20 del extremo pueda ser dimensionado para descargar unas
fuerzas de sujeción excesivas, para prevenir el fallo mecánico de
ciertos elementos operativos internos del accionador de
extremo.
Mediante el control de la intensidad, la
frecuencia, y la duración de la energía electroquirúrgica aplicada
al tejido 150, el usuario puede cauterizar, obturar por
coagulación/desecación, y/o simplemente reducir o retardar el
sangrado. Como antes se ha mencionado, dos factores mecánicos juegan
un papel importante en la determinación del grosor resultante del
tejido obturado, y de la efectividad de la obturación, es decir, la
presión aplicada entre los miembros de mordaza opuestos 22 y 24 y la
distancia de separación entre las superficies obturadoras opuestas
35 de los miembros de mordaza 22 y 24 durante el procedimiento de
obturación, Sin embargo, el grosor de la obturación resultante del
tejido 152 no puede ser controlada adecuadamente sólo por la fuerza.
Dicho en otros términos, con demasiada fuerza los dos miembros de
mordaza 22 y 24 se tocan. y posiblemente entran en cortocircuito, lo
que hará se que una escasa energía se desplace a través del tejido
150, resultando así una mala obturación 152 del tejido. Con una
fuerza demasiado pequeña, la obturación 152 resultará demasiado
gruesa.
La aplicación de una fuerza correcta es también
importante por otras razones: para exponer las paredes del vaso,
para reducir la impedancia del tejido a un valor suficientemente
bajo que permita una corriente suficiente a través del tejido 150, y
para vencer las fuerzas de expansión durante el caldeo del tejido,
además de contribuir a la creación del requerido grosor del tejido
final, que es una indicación de una buena obturación.
Preferiblemente, las superficies obturadoras
conductivas 35 de los miembros de mordaza 22 y 24 son relativamente
planas, para evitar concentraciones de corriente en bordes agudos, y
para evitar arcos entre puntos altos, Además. y debido a la fuerza
de reacción del tejido 150 cuando es acoplado, los miembros de
mordaza 22 y 24 son fabricados preferiblemente para resistirse al
curvado. Por ejemplo, y como se aprecia mejor en la fig. 6A, los
miembros de mordaza 22 y 24 son ahusados preferiblemente a lo largo
de la anchura "W", lo que resulta ventajoso por dos razones: 1)
el ahusamiento aplicará una presión constante para un grosor del
tejido constante en paralelo, b) la porción proximal más gruesa de
los miembros de mordaza 22 y 24 se resistirá al curvado debido a la
fuerza de reacción del tejido 150.
Como se aprecia mejor en las figs. 5 a 6F, con
objeto de conseguir un espaciado deseado entre las superficies 36
eléctricamente conductivas y los respectivas miembros de mordaza 22
y 24 (por ejemplo, el hueco de separación), y aplicar una fuerza
deseada para obturar el tejido 150, al menos uno de los miembros de
mordaza 22 y 24 incluye unos miembros de tope, por ejemplo, 60a que
limita el movimiento de los miembros de mordaza opuestos 22 y 24
entre sí. Preferiblemente, los miembros de tope, por ejemplo 50a, se
extienden desde la superficie obturadora o superficie 35 de contacto
del tejido una distancia predeterminada de acuerdo con las
propiedades del material especificas (por ejemplo, resistencia a la
compresión, expansión térmica, etc) para proporcionar una distancia
del hueco uniforme y precisa durante la obturación. Preferiblemente,
la distancia del hueco entre superficies de obturación opuestas 35
durante unos márgenes de trabajo aproximados de 25,4 \mum a
aproximadamente 127 \mum, y más preferiblemente de entre
aproximadamente 50,8 \mum a aproximadamente 75,2 \mum.
Con preferencia, los miembros de tope están
50a-50g están hechos de un material aislante, por
ejemplo, parileno, nilón, y/o cerámica, y están dimensionados para
limitar los movimientos opuestos de los miembros de mordaza 22 y 24
dentro del margen de separación antes citado. Está previsto que los
miembros de tope 50a-50g puedan ser dispuestos en
uno o ambos miembros de mordaza 22 y 24, en función de la finalidad
particular o para conseguir un resultado particular.
Las figs. 6A-6F muestran varias
configuraciones contempladas de los miembros de tope no conductivos
50a-50g dispuestos sobre, a lo largo, o
sobresaliendo a través del miembro de mordaza 24. Está previsto que
uno o más miembros de tope, por ejemplo, 50a y 50g puedan ser
situados en uno cualquiera o ambos miembros de mordaza 22 y 24, en
función de una finalidad particular o para conseguir un resultado
deseado. Como puede ser apreciado en la presente memoria
descriptiva, las diversas configuraciones de los miembros de tope
50a-50g están diseñadas para limitar el movimiento
del tejido 150 antes y durante la activación, y evitar el
cortocircuitado de los miembros de mordaza 22 y 24 a medida que es
comprimido dicho tejido 150.
Las figs. 6A y 6B muestran una posible
configuración de los miembros de tope 50a-50g para
controlar la distancia de separación entre superficies de obturación
opuestas 35. Más particularmente, un par de miembros de tope 50a a
modo de lengüeta orientados longitudinalmente, están dispuestos en
proximidad al centro de la superficie 35 de obturación, sobre un
lado del canal 36 de cuchilla del miembro de mordaza 24. Un segundo
miembro de tope, por ejemplo, 50b, está dispuesto en el extremo
proximal 26 del miembro de mordaza 24, y un tercer miembro de tope
50g está dispuesto en la punta distal 28 del miembro de mordaza 24.
Preferiblemente, los miembros de tope 50a-50g
pueden estar configurados de cualquier modo geométrico, por ejemplo,
triangular, rectilíneo, circular, ovalado, festoneado, en función de
la finalidad particular. Además, se contempla que cualquier
combinación de miembros de tope diferentes 50a-50g
pueda ser montada a lo largo de las superficies de obturación 35,
para conseguir la distancia de separación deseada. Está previsto
también que los miembros de tope puedan estar diseñados como una
punta elevada (no mostrada) que sobresalga desde la periferia
exterior del miembro de mordaza 24.
La fig. 6C muestra una primera serie de miembros
de tope 50c a modo de círculo extendidos desde el extremo proximal
28 del miembro de mordaza 24 de manera alterna y descentrada
lateralmente entre sí, sobre un lado del canal 36 de cuchilla, y una
segunda serie de miembros de tope a modo de círculo extendidos desde
el extremo distal 26 hasta el extremo proximal 28 del miembro de
mordaza 24, de manera alterna y lateralmente descentrada entre sí
sobre el otro lado del canal 36 de cuchilla. Está previsto que los
miembros de tope 50c a modo de círculo sean sustancialmente de igual
tamaño. No obstante, uno o más de dichos miembros de tope 50c pueden
estar dimensionados para ser mayores o menores que los otros
miembros de tope 50c, según dependa de una finalidad particular o
para conseguir un resultado deseado.
La fig. 6D muestra otra configuración más en la
que el miembro de tope está configurado como una cresta 50e
orientada longitudinalmente, extendida desde un extremo proximal 26
hasta un extremo distal 28 del miembro de mordaza 24, a lo largo del
lado del canal 36 de cuchilla. Como antes se ha dicho, un segundo
borde 50e orientado longitudinalmente puede disponerse sobre el
miembro de mordaza opuesto 22, sobre el lado opuesto del canal 36 de
cuchilla con fines de obturación. La fig. 6E muestra un serie de
miembros 50f a modo de lengüeta alargados dispuestos con un cierto
ángulo con relación al canal 36 de cuchilla. La fig. 6F muestra otra
configuración más en la que miembros de tope diferentes, por
ejemplo, 50a, 50c, y 50g están dispuestos como topes de la
superficie de obturación 35 en ambos lados del canal 36 de
cuchilla.
Preferiblemente, los miembros de tope no
conductivos 50a-50g están moldeados sobre los
miembros de mordaza 22 y 24 (por ejemplo, mediante sobremoldeo,
moldeo por inyección, etc.), estampados sobre los miembros de
mordaza 22 y 24, o depositados (por ejemplo, por deposición) sobre
dichos miembros 22 y 24. Los miembros de tope
60a-50g pueden ser unidos también deslizablemente a
los miembros de mordaza, y/o unidos a las superficies eléctricamente
conductivas 35 mediante encaje rápido a presión. Otras técnicas
requieren la pulverización térmica de un material de cerámica sobre
la superficie del miembro de mordaza 22 y 24, para formar los
miembros de tope 50a-50g. Se contemplan varias
técnicas de pulverización térmica, que requieren la deposición de un
margen amplio de materiales aislantes y resistentes al calor sobre
las superficies eléctricamente conductivas 35, para crear unos
miembros de tope 50a-50g, por ejemplo, deposición de
Oxi-fuel a alta velocidad, deposición de plasma,
etc.
Está previsto que los miembros de tope
50a-50g sobresalgan desde aproximadamente 25,4
\mum hasta aproximadamente 127 \mum desde las superficies
enfrentadas hacia dentro 35 de los miembros de mordaza 22 y 24, como
puede ser apreciado en la presente memoria descriptiva, lo que
reduce la posibilidad de cortocircuito entre las superficie
eléctricamente conductivas, y mejora las características asidoras de
los miembros de mordaza 22 y 24 durante la obturación y la división.
Preferiblemente, los miembros de tope 59a-50g
sobresalen desde aproximadamente 50,8 \mum hasta aproximadamente
76,2 \mum desde la superficie eléctricamente conductiva 35 que ha
sido determinada como que proporciona una distancia de separación
ideal para producir unas obturaciones del tejido efectivas,
uniformes, y consistentes.
Alternativamente, los miembros de tope
50a-50g pueden ser moldeados sobre la superficie 35
que mira hacia dentro de uno o ambos miembros de mordaza 22 y 24, o
en algunos casos, puede ser preferible adherir el miembro de tope
50a-50g a las superficies 35 que miran hacia dentro
de uno o ambos miembros de mordaza 22 y 24, mediante cualquier
método de adherencia conocido. La estampación es definida aquí como
que abarca virtualmente cualquier operación prensora conocida en
este campo, incluyendo, sin limitarse a ello, el punzonamiento,
cizallamiento, formación en frío o en caliente, tracción, curvado,
y troquelado.
Las figs. 6A a 6F muestran algunas de las
posibles configuraciones de los miembros de tope
50a-50f; no obstante, estas configuraciones se
muestran a título de ejemplo, y no constituyen una limitación. Se
contemplan también otras configuraciones de dichos miembros de tope,
que puede resultar igualmente efectivas en la reducción de la
posibilidad de cortocircuitos entre superficies 35 eléctricamente
conductivas, y que mejoran la sujeción del tejido durante la
obturación y la división.
Además, aunque es preferible que los miembros de
tope 50a-50g sobresalgan de aproximadamente 25,4
\mum a aproximadamente 127 \mum, y con preferencia de
aproximadamente 50,8 \mum a aproximadamente 76,2 \mum desde las
superficies 35 que miran hacia dentro de los miembros de mordaza 22
y 24, en algunos casos puede ser preferible hacer que dichos
miembros de tope 50a-50g sobresalgan más o menos, en
función de una finalidad particular. Por ejemplo, se contempla que
el tipo de material utilizado para los miembros de tope
50a-50g, y que la capacidad de los materiales para
absorber las grandes fuerzas de compresión de cierre entre los
miembros de mordaza 22 y 24 varíen, y por tanto, las dimensiones
generales de los miembros de tope 50a-50g pueden
variar también para producir la distancia de separación deseada.
Dicho en otros términos, la fuerza de compresión
del material junto con la distancia de separación última o deseada
requerida para una obturación efectiva, son parámetros que son
considerados cuidadosamente cuando se forman los miembros de tope
50a-50g, y un material puede tener que ser
dimensionado diferentemente de otro material, para conseguir la
misma distancia de separación o resultado deseado. Por ejemplo, la
fuerza de compresión del nilón es diferente de la de la cerámica, y
por tanto, el material de nilón puede tener que ser dimensionado
diferentemente, por ejemplo, más grueso, para contrarrestar la
fuerza de cierre de los miembros de mordaza opuestos 22 y 24, y
conseguir la misma distancia de hueco deseada cuando se utiliza un
miembro de tope de cerámica.
Se describe también un método para obturar y
dividir tejido, que puede incluir las operaciones de proporcionar un
fórceps bipolar endoscópico 10, las cuales incluyen:
- un árbol alargado 12 que tiene unos miembros
de mordaza opuestos 22 y 24 en un extremo distal 14 de él, que
cooperan para asir el tejido 150 entre ellos;
- al menos un miembro de tope no conductivo y
separado 50a-50g, dispuesto sobre una superficie que
mira hacia dentro 35 de al menos uno de los miembros de mordaza, por
ejemplo, el 24, que controla la distancia entre los miembros de
mordaza 22 y 24 cuando el tejido 150 es sostenido entre ellos; y
- una cuchilla 60.
El método puede incluir también las operaciones
de conectar los miembros de mordaza 22 y 24 a una fuente 110 de
energía eléctrica; accionar los miembros de mordaza 22 y 24 para
asir tejido 150 entre dichos miembros 22 y 24 opuestos, conduciendo
energía a través del tejido 150 sujeto entre ellos, para efectuar
una obturación 152 (figs. 7 a 9); y accionar la cuchilla 60 para
cortar el tejido en proximidad a la obturación 152.
Preferiblemente, al menos uno de los miembros de
mordaza, por ejemplo el 24, de la operación de proporcionar el
fórceps, incluye una superficie eléctricamente conductiva 35 que
tiene un canal 36 orientado longitudinalmente definido en ella, que
facilita la actuación de la cuchilla 60 desplazable alternativamente
de modo longitudinal dentro del canal 36, para cortar el tejido 150
en proximidad al lugar de la obturación en él.
De todo lo expuesto y con referencia a los
dibujos expuestos, los expertos en la técnica apreciarán que ciertas
modificaciones pueden ser introducidas también en el forceps de la
presente invención, sin apartarse del alcance de ella. Por ejemplo,
puede ser preferible añadir otras características al fórceps 10,
por ejemplo, un conjunto articulado para desplazar axialmente el
conjunto accionador 20 de extremo con respecto al árbol alargado
12.
Además. Se contempla que el fórceps aquí
descrito pueda incluir un conjunto accionador de extremo desechable,
que selectivamente es acoplable al menos a una porción del
instrumento electroquirúrgico, por ejemplo el árbol 12 y/o el
conjunto de empuñadura 80.
Aunque varias realizaciones de la invención han
sido mostradas en los dibujos, no se pretende que dicha invención se
limite a ellos. Por tanto, la anterior descripción no debe ser
considerada como limitadora, sino simplemente como una explicación
de las realizaciones preferidas, Los expertos en la técnica
imaginarán otras modificaciones dentro del alcance de las
reivindicaciones que se adjuntan.
Claims (19)
1. Un forceps bipolar endoscópico (10) para
obturar y dividir tejido, que comprende:
- un árbol alargado (12) que tiene unos
miembros de mordaza opuestos (22, 24) en un extremo distal (14) de
él, cuyos miembros de mordaza son desplazables entre sí desde una
primera posición,, en la que dichos miembros de mordaza están
dispuestos en relación espaciada entre sí, y una segunda posición en
la que dichos miembros de mordaza cooperan para asir tejido (150)
entre ellos;
- una fuente de energía eléctrica conectada a
cada uno de los miembros de mordaza, de modo que éstos sean capaces
de conducir dicha energía a través del tejido para efectuar una
obturación (152);
- al menos dos miembros de tope no conductivos
(50a-50g) dispuestos sobre una superficie que mira
hacia dentro (34) de al menos uno de los miembros de mordaza, que
controlan la distancia entre dichos miembros de mordaza cuando el
tejido está sujeto entre ellos, y cuyos miembros de tope incluyen
una serie de salientes orientados longitudinalmente que se extienden
desde un extremo proximal (26) de dicho al menos uno de los citados
miembros de mordaza hasta un extremo distal (28) de dicho al menos
uno de los miembros de mordaza; y
- una cuchilla (60) de movimiento alternativo
longitudinal para cortar tejido próximo a la obturación.
2. Un fórceps bipolar endoscópico de acuerdo
con la reivindicación 1, en el que al menos uno de los miembros de
mordaza incluye una superficie (35) eléctricamente conductiva que
cuenta con un canal (36) orientado longitudinalmente definido en
ella, para el movimiento alternativo longitudinal de la cuchilla,
para el corte de tejido.
3. Un fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones precedentes, en el que el
miembro de tope está fabricado de perileno, nilón, o cerámica.
4. El fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones precedentes, en el que la
serie es de lengüetas a modo de círculo.
5. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 4, en el que las lengüetas a modo de círculo
están dispuestas de manera alternativa y descentrada lateralmente
entre sí a todo lo largo del miembro de mordaza.
6. El fórceps bipolar endoscópico de acuerdo
con las reivindicaciones 2 ó 3, en el que la serie es de lengüetas
alargadas.
7. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 6, en el que las lengüetas alargadas están
dispuestas con un cierto ángulo con respecto al canal orientado
longitudinalmente a lo largo de un tramo del miembro de mordaza.
8. El fórceps bipolar endoscópico de acuerdo
con las reivindicaciones 2 ó 3, en el que las lengüetas tienen unas
configuraciones geométricas diferentes.
9. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 8, en el que las lengüetas de forma diferente
están dispuestas a todo lo largo de uno de los miembros de
mordaza.
10. El fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones precedentes, en el que
los miembros de tope sobresalen de 25,4 \mum a 127 \mum desde la
superficie del miembro de mordaza que mira hacia el interior.
11. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 10, en el que el miembro de tope sobresale de
50,8 \mum a 76,2 \mum desde la superficie del miembro de mordaza
que mira hacia el interior.
12. El fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones precedentes, en el que el
miembro de tope está fijo al miembro de mordaza mediante rociadura
térmica.
13. El fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones 1 a 11, en el que el
miembro de tope está fijo al miembro de mordaza mediante
adhesivo.
14. El fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones 1 a 11, en el que el
miembro de tope está fijo al miembro de mordaza mediante un
procedimiento de moldeo.
15. El forceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones precedentes, cuyo fórceps
incluye un conjunto (70) de vástago de accionamiento que conecta los
miembros de mordaza a la fuente de energía eléctrica, de modo que el
primer miembro de mordaza tiene un primer potencial eléctrico, y el
segundo miembro de mordaza tiene un segundo potencial eléctrico;
y
- una empuñadura (80) unida al conjunto de
vástago de accionamiento para impartir el movimiento de los miembros
de mordaza primero y segundo desde sus posiciones primera y
segunda.
16. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 15, que comprende además:
- un disparador (86) que activa mecánicamente
una cuchilla para el corte de tejido en proximidad a la
obturación.
17. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 16, en el que el disparador desplaza la
cuchilla con movimiento longitudinal alternativo.
18. El fórceps bipolar endoscópico de acuerdo
con la reivindicación 1, en el que el primer miembro de tope está
dispuesto sobre la superficie eléctricamente conductiva de uno de
los miembros de mordaza, y al menos un segundo miembro de tope está
dispuesto sobre la superficie eléctricamente conductiva del otro
miembro de mordaza.
19. El fórceps bipolar endoscópico de acuerdo
con una cualquiera de las reivindicaciones 3 a 15, en el que al
menos un miembro de tope está dispuesto sobre la superficie
eléctricamente conductiva del miembro de mordaza, en proximidad a un
lado del canal orientado longitudinalmente, y al menos otro miembro
de tope está dispuesto sobre la superficie eléctricamente conductiva
del miembro de mordaza próximo al otro lado del canal orientado
longitudinalmente.
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PCT/US2001/011413 WO2002080796A1 (en) | 2001-04-06 | 2001-04-06 | Vessel sealer and divider with non-conductive stop members |
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Family
ID=21742482
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ES06008515T Expired - Lifetime ES2364666T3 (es) | 2001-04-06 | 2001-04-06 | Obturador y divisor de vasos con miembros de tope no conductivos. |
ES06002279T Expired - Lifetime ES2332143T3 (es) | 2001-04-06 | 2001-04-06 | Obturador y divisor de vasos con miembros de tope no conductivos. |
ES01923220T Expired - Lifetime ES2262639T3 (es) | 2001-04-06 | 2001-04-06 | Obturador y divisor de vasos com miembros de tope n oconductivos. |
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ES06008515T Expired - Lifetime ES2364666T3 (es) | 2001-04-06 | 2001-04-06 | Obturador y divisor de vasos con miembros de tope no conductivos. |
ES06002279T Expired - Lifetime ES2332143T3 (es) | 2001-04-06 | 2001-04-06 | Obturador y divisor de vasos con miembros de tope no conductivos. |
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AU (1) | AU2001249933B2 (es) |
CA (1) | CA2442598C (es) |
DE (2) | DE60139815D1 (es) |
ES (3) | ES2364666T3 (es) |
WO (1) | WO2002080796A1 (es) |
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2001
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- 2001-04-06 WO PCT/US2001/011413 patent/WO2002080796A1/en active IP Right Grant
- 2001-04-06 JP JP2002578835A patent/JP4499992B2/ja not_active Expired - Lifetime
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- 2001-04-06 ES ES06008515T patent/ES2364666T3/es not_active Expired - Lifetime
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- 2001-04-06 ES ES06002279T patent/ES2332143T3/es not_active Expired - Lifetime
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- 2001-04-06 EP EP01923220A patent/EP1372507B1/en not_active Expired - Lifetime
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- 2001-04-06 DE DE60121229T patent/DE60121229T2/de not_active Expired - Lifetime
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2009
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2012
- 2012-08-13 US US13/584,194 patent/US20120303026A1/en not_active Abandoned
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2015
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- 2015-05-22 US US14/719,887 patent/US20150257819A1/en not_active Abandoned
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2016
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2018
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- 2018-08-02 US US16/053,052 patent/US10265121B2/en not_active Expired - Fee Related
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2019
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EP1685806B1 (en) | 2011-06-08 |
US20150257819A1 (en) | 2015-09-17 |
US20190247111A1 (en) | 2019-08-15 |
US10687887B2 (en) | 2020-06-23 |
AU2001249933B2 (en) | 2006-06-08 |
ES2332143T3 (es) | 2010-01-27 |
US20120303026A1 (en) | 2012-11-29 |
US20180344385A1 (en) | 2018-12-06 |
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WO2002080796A1 (en) | 2002-10-17 |
US20170042607A1 (en) | 2017-02-16 |
US20150250532A1 (en) | 2015-09-10 |
CA2442598A1 (en) | 2002-10-17 |
US20180193087A1 (en) | 2018-07-12 |
US20040122423A1 (en) | 2004-06-24 |
DE60121229T2 (de) | 2007-05-24 |
US8241284B2 (en) | 2012-08-14 |
EP1656901A1 (en) | 2006-05-17 |
US10265121B2 (en) | 2019-04-23 |
EP1685806A3 (en) | 2009-02-04 |
DE60139815D1 (de) | 2009-10-15 |
EP1372507B1 (en) | 2006-06-28 |
US7473253B2 (en) | 2009-01-06 |
DE60121229D1 (de) | 2006-08-10 |
US20090171350A1 (en) | 2009-07-02 |
ES2364666T3 (es) | 2011-09-12 |
US10251696B2 (en) | 2019-04-09 |
CA2442598C (en) | 2011-10-04 |
EP1656901B1 (en) | 2009-09-02 |
JP4499992B2 (ja) | 2010-07-14 |
EP1685806A2 (en) | 2006-08-02 |
JP2004532676A (ja) | 2004-10-28 |
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