ES2250963T3 - Trocar ultrasonico con punta roma. - Google Patents
Trocar ultrasonico con punta roma.Info
- Publication number
- ES2250963T3 ES2250963T3 ES94303387T ES94303387T ES2250963T3 ES 2250963 T3 ES2250963 T3 ES 2250963T3 ES 94303387 T ES94303387 T ES 94303387T ES 94303387 T ES94303387 T ES 94303387T ES 2250963 T3 ES2250963 T3 ES 2250963T3
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/34—Trocars; Puncturing needles
- A61B17/3476—Powered trocars, e.g. electrosurgical cutting, lasers, powered knives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/32—Surgical cutting instruments
- A61B2017/320044—Blunt dissectors
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B2017/320089—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic node location
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Abstract
Un conjunto obturador (10), que comprende: una cánula (14) que comprende un mango de cánula (17) y un tubo de cánula (18) que se extiende desde dicho mango de cánula (17); un obturador (12) para punzar tejido para acceder a una posición para cirugía endoscópica, siendo dicho obturador insertable a través de la citada cánula para obturar dicha cánula, y comprendiendo dicho obturador: un transductor ultrasónico (21); una punta de punción (24) roma, maciza; un mástil (23) que posee un extremo proximal acoplado a dicho transductor (21), y un extremo distal acoplado a dicha punta (24); medios para suministrar energía eléctrica al transductor (21), para provocar que el transductor (21) vibre a una frecuencia de 20 a 150 kHz, y propague vibraciones a lo largo del mástil (23) hasta la punta (24), provocando con ello que la punta (24) vibre a una amplitud de 10 a 300 micrómetros; un mecanismo de realimentación para determinar las variaciones en la carga aplicada a la punta causadas por las diferencias en la impedancia acústica del tejido, y medios de control (63) para controlar la energía suministrada al transductor (21) en base a la realimentación procedente de dicho mecanismo de realimentación.
Description
Trócar ultrasónico con punta roma.
Esta invención se refiere a trócares utilizados
para punzar tejido, para el acceso a áreas del cuerpo a efectos de
realizar cirugía endoscópica y, en particular, a un trócar acabado
en punta roma que utiliza energía ultrasónica para ayudar a punzar
el tejido.
Un conjunto de trócar para su uso en
procedimientos de cirugía endoscópica comprende, en general, dos
componentes principales: un obturador de trócar y un tubo o cánula.
Típicamente, el obturador está inicialmente posicionado en el
interior de la cánula, y posee una punta de punción aguzada y
puntiaguda que es extensible desde la cánula. La punta de obturador
se utiliza para penetrar la piel y el tejido subyacente, para
proporcionar un acceso de cánula a una cavidad corporal. El
obturador se retira a continuación y la cirugía endoscópica se
realiza a través de la cánula.
En el estado de la técnica se conocen trócares
quirúrgicos e instrumentos similares. Por ejemplo, el documento
WO-A-92/14514 describe un trócar
quirúrgico para punzar tejido que hace uso de un corte remoto,
denominado arqueo. El trócar quirúrgico comprende un manguito
operativo adaptado para su disposición a través de una barrera de
tejido, y un obturador dispuesto extraíblemente en el manguito. En
su extremo distal, el obturador se ha dotado de una punta en forma
de pico de pato, que incorpora un elemento cortante, típicamente un
alambre. Una fuente de energía se introduce en el elemento de corte,
para energizar el elemento cortante con el fin de cortar la barrera
de tejido.
El documento
DE-A-37 07 921 describe un
instrumento quirúrgico ultrasónico para la resección y separación de
tejido. El instrumento quirúrgico dispone de una sonda con un
elemento de cauterización en su extremo de trabajo. El elemento de
cauterización puede ser un electrodo bipolar conectado a un
oscilador de alta frecuencia, o un elemento de calentamiento
conectado a una fuente de corriente. El instrumento quirúrgico se
introduce en el cuerpo a través de una cánula endoscópica, y se
presiona contra el tejido que va a ser resecado. La resección se
consigue utilizando vibraciones ultrasónicas, y el tejido resecado
se retira del lugar de resección mediante succión.
El documento CA-1 098 003
describe un instrumento quirúrgico vibrante para realizar pasos a
través del tejido corporal, para proporcionar acceso para
operaciones quirúrgicas por debajo del tejido. El tamaño de la sonda
vibrante de penetración del tejido se determina mediante la longitud
de la fibra de tejido que se desea penetrar. Para tejido muscular,
un tamaño adecuado de la sonda es del orden de milímetros. La
amplitud de la oscilación de la sonda es del mismo orden que el
tamaño de la propia sonda.
El documento US-5 123 903
describe un instrumento médico útil para realizar la rotura
ultrasónica del tejido y su extracción. El instrumento está
construido de tal modo que no desgarra el tejido conectivo, tal como
los vasos sanguíneos y el tejido muscular.
El documento
WO-A-92/11815 describe un
dispositivo ultrasónico útil para el tratamiento de lesiones
oclusivas. El dispositivo ha sido construido para realizar el
ensanchamiento de aberturas preexistentes.
Muchos trócares disponen de protectores de
seguridad que pueden cubrir la punta del obturador. Si el trócar se
desmonta, el protector de seguridad se mantiene en su posición de
cobertura de la punta. Cuando el conjunto de trócar está encajado
para la punción, el protector de seguridad puede ser movido para
dejar al descubierto la punta de punción. Un usuario aplica a
continuación una fuerza al trócar, y el obturador se utiliza para
punzar la piel y el tejido con el fin de alcanzar la posición de
realización de la cirugía. Cuando se deja de hacer fuerza, el
protector de seguridad vuelve a cubrir la punta de obturador.
Esto requiere una fuerza mecánica para punzar la
piel y los músculos, para alcanzar el tejido blando, típicamente la
posición deseada para la cirugía. En cirugía abdominal, por ejemplo,
la pared abdominal que comprende capas epidérmicas, fascia, músculo
y peritoneo, se punza para alcanzar la víscera interna. Con
frecuencia, cuando se alcanza el tejido blando, existe una
liberación súbita de la resistencia a la fuerza de punción, en cuyo
punto el usuario libera la fuerza con el fin de evitar una punción
indeseada de otro tejido con la punta aguda del obturador, puesto
que el protector de seguridad cubre la punta del obturador.
Por lo tanto, un objeto de esta invención
consiste en proporcionar un trócar que reduce aún más cualquier
riesgo de daño al tejido blando o subyacente, con la punta punzante
de un obturador. También es un objeto de la presente invención
proporcionar un trócar que ayude al usuario a punzar el tejido,
reduciendo con ello la cantidad necesaria de fuerza de usuario y
permitiendo un control de usuario mayor y más fácil. Otro objeto de
la invención consiste en proporcionar un trócar que no requiera
protector de seguridad.
La presente invención proporciona un conjunto
obturador para su uso en cirugía endoscópica, por ejemplo, para
punzar la pared abdominal para acceder a órganos u otro tejido, para
la realización de cirugía. Según se expone en la reivindicación 1,
la presente invención proporciona un trócar dotado de punta roma,
que utiliza energía ultrasónica entregada a su punta para ayudar a
la inserción de un obturador y una cánula de trócar. La
configuración de punta de obturador roma o redondeada de la presente
invención, reduce el riesgo de daño accidental, mientras que la
energía ultrasónica permite que el conjunto de trócar penetre el
tejido con una fuerza relativamente menor que en los conjuntos de
trócar conocidos. El conjunto obturador incluye un mecanismo de
realimentación según se define en la reivindicación 1.
En una realización preferida de la invención se
proporciona un mecanismo de interrupción que desconecta el
dispositivo cuando el trócar ha penetrado el tejido externo de un
paciente, por ejemplo, la pared abdominal del paciente. El mecanismo
de realimentación se utiliza para determinar cuándo la punta del
dispositivo ha penetrado el tejido, en cuyo momento se interrumpe la
energía ultrasónica suministrada a la punta, o se reduce hasta un
estado de inactivo.
En una realización, un sensor de luz situado en
una porción inactiva del conjunto de trócar, con preferencia en el
alojamiento de obturador, se utiliza para detectar la luz emitida
desde una fuente luminosa, y que se refleja desde una porción activa
del obturador ultrasónico para determinar la carga o impedir el
efecto del tejido sobre la punta de trócar.
En otra realización, el mecanismo de
realimentación comprende un elemento pasivo piezoeléctrico situado
en el interior de un apilamiento piezoeléctrico de un transductor
ultrasónico. El elemento pasivo vibra con otros elementos
piezoeléctricos cerámicos del apilamiento, pero a diferencia de los
otros elementos, no está energizado. La vibración del elemento
pasivo crea una tensión oscilante a través del elemento que
corresponde con las vibraciones del apilamiento piezoeléctrico. A
partir de la tensión a través del elemento, se puede determinar la
carga en el trócar mediante métodos bien conocidos en la técnica. El
elemento pasivo puede estar acoplado a un medio de control de un
generador utilizado para suministrar energía eléctrica al
transductor ultrasónico, para originar vibraciones.
Se pueden utilizar parámetros eléctricos para
detectar y determinar la variación de las condiciones de carga en la
punta del obturador puesto que la impedancia acústica está
relacionada con la impedancia del sistema del conjunto de generador
y trócar. En un sistema de ese tipo se utiliza, ya sea las
diferencias de tensión y corriente, o ya sea las relaciones de
magnitud de la tensión y la corriente suministradas al aplicador
manual, para hacer esa determinación. Según se incrementa la carga,
la diferencia de fase entre la tensión y la corriente cambia desde
un estado resonante de 0º hasta una diferencia de ángulo de fase
negativa relacionada con la condición de carga.
El sistema de realimentación está adaptado para
detectar características del tejido, tal como tejido duro o blando.
Los diferentes tipos de tejido tienen diferentes impedancias
acústicas que afectan a las características de carga. La
realimentación es utilizada por los medios de control para ajustar
el nivel de energía ultrasónica de la punta vibrante de acuerdo con
la condición de carga, por ejemplo aumentando la salida de energía
por parte del generador cuando la carga se incrementa. De este modo,
se puede proporcionar un nivel de energía relativamente estable en
la punta del obturador.
Otra característica de la realización preferida
proporciona un mecanismo de reposición (reset) que debe ser usado
cada vez que el trócar es desconectado por el mecanismo de
interrupción con anterioridad a que pueda ser conectado de
nuevo.
Otra realización de la presente invención
proporciona elementos transductores ultrasónicos que son integrales
con el mástil del obturador.
Otra realización de la invención proporciona un
generador ultrasónico auto-contenido en el que los
elementos electrónicos están contenidos en el interior del mango del
trócar.
La Figura 1 ilustra un conjunto de trócar de una
realización de la presente invención.
La Figura 2 ilustra una vista en perspectiva,
despiezada, de un conjunto de trócar de la Figura 1.
La Figura 3 ilustra una vista en planta, en
sección transversal, del obturador de trócar de las Figuras 1 y
2.
La Figura 4 ilustra una vista en planta, en
sección transversal, del alojamiento de las Figuras 1 y 2.
La Figura 5 ilustra una vista en planta, en
sección transversal, del conjunto de cánula de las Figuras 1 y
2.
La Figura 6 ilustra un circuito de realimentación
de impedancia de tejido del conjunto de trócar ilustrado en la
Figura 7.
La Figura 7 ilustra una vista en planta, en
sección transversal, del conjunto de trócar de las Figuras 1 y 2,
con un gráfico correspondiente que ilustra la energía ultrasónica a
lo largo de la longitud del trócar.
La Figura 8 ilustra una porción distal del
conjunto de trócar ilustrado en las Figuras 1 y 2.
La Figura 9 ilustra una porción distal del
conjunto de trócar de otra realización de la presente invención.
La Figura 10 ilustra una vista en planta, en
sección transversal, de un conjunto de trócar de otra realización de
la presente invención, con una sección cortada.
La Figura 11 ilustra una vista en planta, en
sección transversal, del obturador de trócar del conjunto de trócar
de la Figura 10.
La Figura 12 ilustra una vista en planta, en
sección transversal, del conjunto de trócar de la Figura 10.
La Figura 13 ilustra una vista en perspectiva de
un mástil de trócar de la Figura 11.
La Figura 14 es un diagrama de flujo que ilustra
el uso del trócar de la presente invención.
La Figura 15 es un diagrama de flujo que ilustra
el uso del sistema de realimentación de impedancia de la presente
invención.
La Figura 16 ilustra el obturador de trócar de la
presente invención durante el uso con un paciente para llevar a cabo
cirugía laparoscópica abdominal.
Haciendo ahora referencia a las Figuras
1-8, se ha ilustrado un conjunto de trócar 10 que
comprende un alojamiento 11, un obturador de trócar 12 y un conjunto
de cánula 14.
El obturador 12 constituye la porción activa del
conjunto de trócar, es decir, transmite energía ultrasónica o vibra
a una frecuencia ultrasónica. El obturador 12 comprende una masa
extrema 20, un transductor 21, un amplificador 22, un mástil guía
ondas 23 y una punta roma 24 de punción.
La masa extrema 20 está acoplada de manera
enganchable, por su extremo distal, al extremo proximal del
transductor 21. El transductor 21 comprende elementos transductores.
En la realización preferida ilustrada en la Figura 2, el transductor
consiste en un apilamiento PZT que comprende electrodos activos
alternos 25 y electrodos de masa 26, con elementos transductores 27
cerámicos piezoeléctricos que alternan entre los electrodos 25 y 26.
Cada uno de los electrodos activos 25, electrodos de masa 26 y
electrodos cerámicos 27, posee un orificio en posición central. Los
electrodos activos están conectados eléctricamente a un cable 60 y
los electrodos de masa 26 están conectados eléctricamente a un cable
de masa 61. Los cables 60 y 61 conducen a un generador 62 externo al
conjunto de trócar 10. En una realización alternativa, los elementos
transductores pueden ser magneto-restrictivos.
Uno de los electrodos de masa es un diafragma de
montaje 28 que está en contacto con el interior del alojamiento 11
como se describe más adelante. Se utiliza un perno 29 para acoplar
la masa extrema 20 al transductor 21, y el transductor 21 al
amplificador 22. El perno 29 se inserta desde el extremo proximal de
la masa extrema 20 a través de un orificio realizado en la masa
extrema 20 y de los orificios de los electrodos 25, 26 y de los
elementos cerámicos 27 del transductor situados distalmente de la
masa extrema 20. El perno 29, roscado en su extremo distal, se
atornilla en un orificio roscado realizado en el extremo proximal
del amplificador 22. El extremo proximal del amplificador de
obturador 22 posee una junta tórica 42 que está situado en una
ranura 43, en el amplificador 22. El extremo distal del amplificador
22 está acoplado al extremo proximal del guía ondas 23. El extremo
distal del guía ondas 23 está acoplado al extremo proximal de la
punta 24. La punta 24 está ahusada hacia el extremo distal del
obturador 12, donde la punta 24 presenta un perfil redondeado.
La punta puede ser integral con el guía ondas o
puede ser sujetada, por ejemplo, como se la ha ilustrado en la
Figura 2, atornillando un extremo 24a proximal roscado, en un
orificio roscado 23a del guía ondas. En la realización de las
Figuras 1-8, el guía ondas comprende una serie de
juntas tóricas 50 distribuidos a lo largo de su longitud. Las juntas
tóricas 50 comprenden un plástico no conductor, separado por
distancias iguales a lo largo del mástil en puntos nodales, es
decir, puntos a una distancia a lo largo del mástil igual a un
múltiplo entero de 1/2 longitud de onda de una frecuencia
ultrasónica predeterminada. En otras palabras, los puntos nodales
son puntos situados a lo largo de la longitud del guía ondas en los
que la onda seno de la amplitud de la vibración ultrasónica, es
decir, la energía vibratoria, es igual a cero. El guía ondas 23 y la
punta 24 están hechos con preferencia a partir de un mástil de
núcleo macizo, construido con un material que propaga eficazmente la
energía ultrasónica, tal como una aleación de aluminio o de
titanio.
El alojamiento 11 comprende una tapa extrema 30,
un conector 31 y una funda 32. La funda 32 comprende, con
preferencia, un material que posee una baja conductividad térmica y
eléctrica, y un bajo coeficiente de rozamiento, tal como teflón o
policarbonato. La tapa extrema 30 se sitúa en el extremo distal del
alojamiento 11 y actúa como mango para que el usuario sujete y
manipule el conjunto de trócar 10. La tapa extrema 30 posee una
porción circunferencial superior 36 y una porción circunferencial
inferior 37. La porción circunferencial inferior 37 posee un
diámetro mayor que la porción circunferencial superior 36, y de ese
modo forma un labio 38 en el que se encuentra con la porción
circunferencial superior 36. El conector 31 posee una porción
circunferencial superior 39 y una porción circunferencial inferior
40. La porción circunferencial inferior 40 posee un diámetro más
grande que la porción circunferencial superior 39, y de ese modo
forma un labio 41 donde se encuentra con la porción circunferencial
superior 39.
El extremo proximal del obturador 12, que incluye
la masa extrema 20 y el transductor 21, se inserta en la tapa
extrema 30 de modo que el diafragma 28, que tiene un diámetro mayor
que los electrodos 25, los electrodos 26 y los elementos cerámicos
27, permanece sobre el labio 38. La porción superior 39 del medio
conector 31 se inserta en, y se conecta a, la circunferencia
interior de la porción inferior 37 de la tapa extrema 30 mediante
pasadores 33. El diafragma 28 de montaje de obturador se engancha a
continuación entre el labio 38 y el extremo proximal de la porción
superior 39 mediante una fuerza de presión, acoplando así el
obturador 12 al alojamiento 11. El labio 41 del medio conector 31
permanece contra el extremo distal de la tapa extrema 30.
El conector 31 posee un orificio roscado 34 en su
extremo distal. La funda de alojamiento 32 tiene un extremo proximal
roscado 35 que se atornilla en el orificio roscado 34.
La funda de alojamiento 32 se acopla sobre el
amplificador de obturador 22 y el guía ondas 23, con el extremo
distal de la punta 24 extendiéndose desde el extremo distal de la
funda 32. Las juntas tóricas 50 sirven como medio para aislar las
porciones vibrantes del guía ondas 23 respecto a la pared interna de
la funda de alojamiento 32 con el fin de evitar la atenuación de la
transmisión de ondas ultrasónicas. De este modo, el alojamiento 11
está en contacto con el obturador solamente en dos lugares: en el
diafragma 28 y en la junta tórica 50, estando ambos situados en
puntos nodales. El alojamiento evita el contacto entre el usuario
que sujeta el aplicador manual y la porción activa, es decir, el
obturador.
La Figura 8 ilustra una vista a mayor tamaño de
la punta de trócar 24 y del guía ondas 23. Se ha ilustrado un medio
para aislar el guía ondas de la funda de alojamiento, en el que el
medio comprende muescas 51 en el guía ondas 23 para albergar las
juntas tóricas 50. La muesca 51 permite que la junta tórica 50 se
extienda próxima a la circunferencia de guía ondas y permitir con
ello un ajuste ceñido con la funda de alojamiento 32.
La Figura 9 ilustra otra realización de un medio
de aislamiento. El alojamiento 11 comprende una funda 132 con
protuberancias 151 que se extienden hacia el interior desde la
circunferencia interna de la funda de alojamiento para contactar con
el mástil. Las protuberancias 151 están situadas en puntos nodales,
de modo que se transfieren vibraciones mínimas a la funda y se
produce una atenuación mínima de la energía ultrasónica. Otra
realización del medio de aislamiento puede comprender anillos que se
moldean en el mástil de obturador.
El conjunto de cánula 14 comprende una porción de
mango 17 y un tubo de cánula 18. La funda de alojamiento 32 y el
guía ondas 23 se acoplan en el interior del tubo de cánula 18. La
punta 24 se extiende más allá del extremo distal del tubo de cánula
18. El tubo de cánula 18 es ahusado en su extremo distal.
El alojamiento 11 está acoplado a la porción 17
de mango de cánula a través de un medio de acoplamiento 44, por el
extremo distal del conector de alojamiento 31, adaptado para ser
recibido por el extremo proximal del mango de cánula 17.
Según se ha mostrado en la Figura 7, la amplitud
de la vibración depende de la posición a lo largo de la punta, con
amplitud cero en los puntos nodales y amplitud máxima en puntos
anti-nodo, es decir, donde la magnitud del seno de
la forma de onda vibratoria es igual a uno. La distancia de un
anti-nodo desde su punto nodal más cercano, es de
1/4 de la longitud de onda. El extremo distal de la punta 24 está en
un anti-nodo.
El generador 62 incluye una unidad de control 63
(Figura 6), una clavija de entrada (no representada) que puede ser
enchufada a una unidad de electrocirugía o bien a la toma de salida
de una pared, y cables de salida 60, 61. Se ha conectado un cable 64
de entrada procedente de un mecanismo de disparo 67, a la unidad de
control 63 del generador. Un mecanismo de disparo 67 comunica con la
unidad de control del generador para suministrar energía ultrasónica
a la punta de trócar. En esta realización, el mecanismo de disparo
67 consiste en un conmutador accionado con el pie, que puede ser
controlado por el cirujano.
En otra realización, el mecanismo de disparo es
un pulsador de reposición situado en el alojamiento 11 del conjunto
de trócar. El pulsador de reposición funciona como lo hace el
conmutador de pie 67 para conmutar el conjunto de trócar desde un
estado de preparado, en el que el generador está en conexión, en el
que el trócar está en inactividad y los parámetros iniciales han
sido medidos, hasta un estado activo en el que se está suministrando
energía a la punta.
El generador 62 envía energía eléctrica por medio
del cable 60 hasta los electrodos activos 25, que retorna a través
de los electrodos de masa 26 y después por el cable 61. La energía
hace que las piezas cerámicas piezoeléctricas vibren, lo que provoca
que el obturador vibre a una frecuencia ultrasónica resonante
predeterminada. La energía ultrasónica resultante es transmitida al
amplificador 22. El amplificador 22, debido a su configuración,
amplifica la energía ultrasónica que se transmite después por el
guía ondas 23 hasta la punta 24.
La amplitud depende de la conservación del
momento debido al cambio de diámetro del obturador. Se utiliza un
desplazamiento de punta de entre 10 y 300 micrómetros.
La frecuencia del obturador está predeterminada.
La frecuencia es, con preferencia, suficientemente alta, de modo que
está fuera de la gama audible humana, es decir, por encima de 20
kHz. Se estima que para una amplitud constante, cuanto mayor es la
frecuencia, más efecto de cavitación se producirá. Sin embargo,
según se incrementa la frecuencia, la amplitud de la punta es más
difícil de alcanzar debido a la inercia de la masa. Así, se utiliza
una frecuencia comprendida en la gama de 20 kHz a 150 kHz.
Se ha incluido un mecanismo de realimentación que
mide, ya sea de forma continuada o ya sea de forma periódica, la
condición de carga de la punta de trócar para determinar si existe
una condición de carga preestablecida. La unidad de control actúa
como medio para controlar la energía suministrada al obturador en
base a la realimentación desde el mecanismo de realimentación. En
esta realización particular, la unidad de control cambia
automáticamente su actuación entre un estado activo y un estado
inactivo, es decir, en inactividad o completamente desconectado,
dependiendo de la condición de carga determinada por el mecanismo de
realimentación.
Las Figuras 14-16 ilustran una
utilización del conjunto de trócar de esta invención. Una vez que se
ha insuflado con dióxido de carbono la cavidad abdominal 90 del
paciente, utilizando, por ejemplo, una aguja de insuflación tipo
Verress, la punta de trócar 24 se sitúa donde debe realizarse la
punción 91. El conjunto de trócar se conecta al generador en estado
de desarmado. El generador mide a continuación los parámetros
iniciales del obturador, es decir, sin carga de punta, y arma el
sistema, es decir, sin carga de punta. El trócar está entonces en
estado de preparado, en cuyo momento el cirujano puede activar la
potencia, utilizando el mecanismo de disparo 67, por ejemplo, un
conmutador de pie o pulsador de reposición. El cirujano sitúa el
conjunto de trócar en el lugar de inserción. Se suministra energía
ultrasónica a la punta mientras el cirujano aplica una fuerza mínima
hasta que el trócar ha atravesado el lugar de inserción. Se estima
que la punta activa o energizada del guía ondas causa una presión
mecánica y la cavitación del tejido que provoca que el obturador
penetre el tejido.
Cuando el mecanismo de realimentación detecta una
condición de ausencia de carga en la punta de trócar 24, la unidad
de control desconecta la energía ultrasónica. La potencia no puede
ser conectada de nuevo a menos que se utilice el mecanismo de
disparo 67. El trócar 10 puede ser repuesto mediante la liberación
del mecanismo de disparo. Este mecanismo proporciona una
característica de seguridad que, entre otras cosas, impide la
re-conexión accidental de la potencia del
instrumento cuando el trócar ha penetrado ya el tejido y se ha
desconectado por sí mismo.
En una realización preferida, la carga de la
punta se mide periódicamente, y se determina una carga máxima.
Cuando la carga disminuye en una cantidad de un porcentaje de
reducción predeterminado de la máxima carga, se indica una condición
de carga preestablecida. En una realización preferida, la condición
de carga preestablecida indica una condición de no carga, en cuyo
momento la punta de trócar ha penetrado el tejido y el trócar ha
sido desconectado por el mecanismo de desconexión.
Con referencia a la Figura 6, se ha ilustrado una
realización del mecanismo de realimentación. Una fuente de luz 70,
que comprende un diodo láser, emite luz hasta un divisor de haz 71
en el que la luz se divide en un haz de referencia y un haz de
aplicador manual. El diodo 70 está acoplado a una fibra óptica 73 en
un acoplador de fibra 72. La fibra óptica 73 se extiende a través de
una abertura 74 del extremo proximal del alojamiento 11 (Figura 7).
La fibra óptica 73 dirige el haz de aplicador manual hacia el
extremo proximal de la masa extrema 20. La luz se refleja hacia
fuera de la masa extrema 20, y varía de frecuencia por efecto
Doppler en virtud de la masa extrema 20 vibrante. El haz de
aplicador manual se desplaza hacia atrás por medio de la fibra
óptica 73, de un divisor de haz 75, y después hasta un fotodetector
77. El haz de referencia que fue dividido en el divisor de haz 71,
es recibido también por el fotodetector 77 a través de un acoplador
de fibra 76. El haz de referencia y el haz de aplicador manual, se
modulan para crear una frecuencia de barrido que es convertida por
el fotodetector 77 en una señal eléctrica modulada. La señal
eléctrica modulada se envía a un analizador de frecuencia 78, el
cual determina la carga en la punta de trócar en base a la variación
de frecuencia por efecto Doppler determinada por la frecuencia de
barrido. El analizador de frecuencia 78 comunica con el medio de
control 63 del generador. El medio de control 63 desconecta el
trócar al nivel de carga apropiado.
Además de estar adaptado para la detección de
cualquiera de las condiciones de carga/no carga, el mecanismo de
realimentación puede ser el nivel específico de carga de punta, o
bien un cambio en la carga.
El usuario puede provocar un cambio en la
impedancia aplicando más presión cuando inserta el trócar. Como
característica de seguridad, el instrumento puede estar también
adaptado para que sea sensible a la cantidad de presión aplicada por
un usuario, para permitir que el usuario libere presión para
desconectar la energía ultrasónica en cualquier momento antes,
durante o después de que se haya producido la penetración del
trócar. El instrumento puede estar también adaptado para desconectar
a un nivel de impedancia o de carga. Esta característica permitirá
al instrumento desconectarse cuando se alcance un nivel de
impedancia inusualmente alta, por ejemplo, debido a que la punta
haya alcanzado un hueso o debido a que el instrumento se haya roto o
fracturado, en cuyo caso la impedancia medida en la punta se
mostrará elevada.
El mecanismo de realimentación se utiliza para
ajustar el nivel de energía ultrasónica en respuesta al cambio en la
consistencia del tejido según se refleja en la carga de punta. El
mecanismo de realimentación puede detectar la carga e incrementar la
energía al transductor para compensar la pérdida de energía en el
tejido y la reducción resultante en el desplazamiento de la punta
debido a la carga.
El obturador puede ser
semi-reutilizable, o de uso para un sólo paciente, y
estar empaquetado con al menos un trócar desechable, y puede estar
diseñado para conectar a la corriente cánulas de trócar
desechables.
Haciendo ahora referencia a las Figuras
10-13, se ha ilustrado otra realización de la
presente invención. El conjunto de trócar 100 comprende un obturador
112 y una cánula 114. El obturador 112 comprende un alojamiento 111
acoplado por un extremo proximal 120 a un mástil de obturador 122.
El mástil de obturador 122 comprende un transductor piezoeléctrico
121 integral con el mástil de obturador 122 para convertir la
energía eléctrica en energía ultrasónica, la cual se transmite a lo
largo de la longitud del mástil 122 hasta una punta 123. La punta
123 está acoplada a un orificio roscado 190, en el extremo distal
del mástil, por medio de un extremo proximal roscado 191. El mástil
posee muescas 152 en puntos nodales, para albergar juntas tóricas
150.
El conjunto de cánula 114 comprende un mango 117
y un tubo de cánula 118 unido al mismo.
El alojamiento de obturador 111 posee lengüetas
de conector 119 que son recibidas por el mango de cánula 117 para
acoplar la cánula 114 al obturador 112. El obturador 112 es
insertable a través del mango de cánula 117 y del tubo de cánula
118, de modo que la punta de obturador 123 se extiende desde un
extremo distal 113 ahusado del tubo de cánula 118. Los juntas
tóricas150 situadas en puntos nodales a lo largo del mástil de
obturador 122 sirven para aislar la cánula 114 del obturador activo.
La energía ultrasónica se amplifica en la punta de obturador
123.
En esta realización, los elementos 162 de
generación electrónica de alta tensión, están incrustados en el
alojamiento de obturador 111, los cuales actúan como un generador
para suministrar energía al transductor 121 mientras extraen energía
desde un generador de electrocirugía, o desde una salida de AC de
pared. La energía puede ser suministrada opcionalmente desde un
generador exterior al alojamiento.
Se puede apreciar a partir de cuanto antecede,
que pueden realizarse numerosas equivalencias o modificaciones sin
apartarse del alcance de la invención, según se define en las
reivindicaciones. No se pretende ninguna limitación a la invención
reivindicada a partir de las realizaciones específicas aquí
descritas.
Claims (31)
1. Un conjunto obturador (10), que comprende:
una cánula (14) que comprende un mango de cánula
(17) y un tubo de cánula (18) que se extiende desde dicho mango de
cánula (17);
un obturador (12) para punzar tejido para acceder
a una posición para cirugía endoscópica, siendo dicho obturador
insertable a través de la citada cánula para obturar dicha cánula, y
comprendiendo dicho obturador:
un transductor ultrasónico (21);
una punta de punción (24) roma, maciza;
un mástil (23) que posee un extremo proximal
acoplado a dicho transductor (21), y un extremo distal acoplado a
dicha punta (24);
medios para suministrar energía eléctrica al
transductor (21), para provocar que el transductor (21) vibre a una
frecuencia de 20 a 150 kHz, y propague vibraciones a lo largo del
mástil (23) hasta la punta (24), provocando con ello que la punta
(24) vibre a una amplitud de 10 a 300 micrómetros;
un mecanismo de realimentación para determinar
las variaciones en la carga aplicada a la punta causadas por las
diferencias en la impedancia acústica del tejido, y
medios de control (63) para controlar la energía
suministrada al transductor (21) en base a la realimentación
procedente de dicho mecanismo de realimentación.
2. El conjunto obturador de la reivindicación 1,
en el que el transductor (21) comprende elementos piezoeléctricos
(27).
3. El conjunto obturador de la reivindicación 1,
en el que el transductor (21) comprende elementos
magneto-restrictivos.
4. El conjunto obturador de la reivindicación 1,
que comprende además un alojamiento (11) que contiene a dicho
transductor ultrasónico (21).
5. El conjunto obturador de la reivindicación 1,
que comprende además una masa extrema (20) que tiene un extremo
distal, en el que el transductor (21) posee un extremo proximal y un
extremo distal, y dicho extremo proximal del transductor (21) está
acoplado al extremo distal de la citada masa extrema (20).
6. El conjunto obturador de la reivindicación 1,
que comprende además un amplificador (22) acoplado al extremo
proximal del mástil (23) y al extremo distal del transductor
(21).
7. El conjunto obturador de la reivindicación 1,
en el que los medios de suministro de energía comprenden un
generador (62) remoto del alojamiento (11).
8. El conjunto obturador de la reivindicación 1,
en el que los medios de suministro de energía eléctrica comprenden
elementos generadores electrónicos (162) contenidos en el interior
del alojamiento (111).
9. El conjunto obturador de la reivindicación 1,
en el que el transductor ultrasónico (121) es integral con el citado
mástil (122) de dicho obturador (112).
10. El conjunto obturador de la reivindicación 1,
en el que dichos medios de control (63) comprenden además un
mecanismo de interrupción para desconectar la entrega de energía
ultrasónica a la punta (24) cuando el mecanismo de realimentación
determina la existencia de una condición de carga
preestablecida.
11. El conjunto obturador de la reivindicación
10, en el que la condición de carga preestablecida indica que el
obturador (12) ha penetrado el tejido.
12. El conjunto obturador de la reivindicación
10, en el que la condición de carga preestablecida indica una o más
características de tejido del tejido que carga la punta (24).
13. El conjunto obturador de la reivindicación
10, que comprende además un mecanismo de reposición que debe ser
utilizado cada vez que el obturador (12) es desconectado por el
mecanismo de interrupción, antes de que pueda ser conectado de
nuevo.
14. El conjunto obturador de la reivindicación 1,
en el que el mecanismo de realimentación comprende una fuente
luminosa (70) y un receptor de luz (77) situado en el alojamiento
(11), en el que dicha fuente luminosa (70) dirige luz hacia una
porción activa del obturador (12), en el que dicho receptor de luz
(77) recibe luz reflejada desde la porción activa, y en el que dicha
luz reflejada tiene una variación de frecuencia por efecto Doppler
relacionada con la carga de la punta (24) a partir de la cual se
determina la carga en la punta (24).
15. El conjunto obturador de la reivindicación 1,
en el que el transductor (21) comprende elementos piezoeléctricos
(27), y en el que el mecanismo de realimentación comprende un
elemento piezoeléctrico pasivo localizado en el interior de un
apilamiento piezoeléctrico del transductor (21).
16. El conjunto obturador de la reivindicación 1,
en el que el mecanismo de realimentación utiliza como parámetros
eléctricos la tensión y la corriente suministradas al transductor
(21), para determinar las variaciones de carga en la punta (24).
17. El conjunto obturador de la reivindicación
16, en el que los parámetros eléctricos utilizados para determinar
la carga en la punta (24) son las diferencias de cambio de fase
entre la tensión y la corriente.
18. El conjunto obturador de la reivindicación
16, en el que los parámetros eléctricos utilizados para determinar
la carga en la punta (24) son relaciones de las magnitudes de
tensión y corriente suministradas al transductor (21).
19. El conjunto obturador de la reivindicación 1,
en el que los medios de control (63) están capacitados para ajustar
la cantidad de energía suministrada al obturador (12) para compensar
los cambios en la carga con el fin de proporcionar un nivel de
energía relativamente estable en la punta (24).
20. El conjunto obturador de la reivindicación
10, en el que dicho nivel de carga preestablecido es un nivel máximo
de impedancia.
21. El conjunto obturador de la reivindicación 1,
que comprende además un mecanismo de disparo (67) que conmuta a
conexión la energía eléctrica, para suministrar energía eléctrica al
obturador (12).
22. El conjunto obturador de la reivindicación
21, en el que dicho mecanismo de disparo (67) comprende un
conmutador accionado con el pie, acoplado a la citada fuente de
energía.
23. El conjunto obturador de la reivindicación
21, en el que dicho mecanismo de disparo (67) comprende un pulsador
de reposición asociado a dicho obturador (12), conmutando a conexión
el citado pulsador de reposición, cuando se depresiona, la energía
suministrada al obturador (12).
24. El conjunto obturador de la reivindicación 1,
en el que dicho alojamiento (11) está adaptado para ser utilizado
como mango para manejar el conjunto obturador (10).
25. El conjunto obturador de la reivindicación 1,
que comprende además un conector (31) que asegura el transductor
(21) al alojamiento (11) en un punto nodal.
26. El conjunto obturador de la reivindicación
25, en el que el conector (31) comprende un extremo distal con un
medio de acoplamiento (44) para acoplar el conector (31) a la cánula
(14), estando dicho medio de acoplamiento (44) adaptado para ser
recibido por el extremo proximal del mango de cánula (17).
27. El conjunto obturador de la reivindicación 1,
en el que dicho alojamiento (11) comprende además una funda (32)
coaxial con el mástil (23), y que se adapta sobre la circunferencia
externa del mástil (23), y en el que dicha funda (32) del citado
alojamiento (11) está adaptada para ser insertada a través de dicho
tubo de cánula (18).
28. El conjunto obturador de la reivindicación
27, en el que dicha funda (32) comprende un material de
policarbonato.
29. El conjunto obturador de la reivindicación
27, en el que dicho obturador (12) comprende además medios de
aislamiento para aislar las vibraciones a lo largo del mástil (23)
de dicha funda (32), estando dichos medios de aislamiento situados
en al menos un punto nodal.
30. El conjunto obturador de la reivindicación
29, en el que dichos medios de aislamiento comprenden al menos una
junta tórica tórica (50) situada en una ranura correspondiente (51)
formada en dicho mástil (23) en un punto nodal.
31. El conjunto obturador de la reivindicación
29, en el que dichos medios de aislamiento comprenden al menos una
protuberancia (151) que se extiende circunferencialmente hacia el
interior desde la circunferencia interna de la funda (32) para
contactar con el citado mástil (23) en un punto nodal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60897 | 1993-05-12 | ||
| US08/060,897 US5449370A (en) | 1993-05-12 | 1993-05-12 | Blunt tipped ultrasonic trocar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2250963T3 true ES2250963T3 (es) | 2006-04-16 |
Family
ID=22032430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES94303387T Expired - Lifetime ES2250963T3 (es) | 1993-05-12 | 1994-05-11 | Trocar ultrasonico con punta roma. |
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|---|---|
| US (1) | US5449370A (es) |
| EP (1) | EP0624346B1 (es) |
| JP (1) | JPH0751281A (es) |
| AT (1) | ATE308280T1 (es) |
| AU (1) | AU671013B2 (es) |
| CA (1) | CA2123271C (es) |
| DE (1) | DE69434526T2 (es) |
| ES (1) | ES2250963T3 (es) |
| GR (1) | GR1002520B (es) |
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1993
- 1993-05-12 US US08/060,897 patent/US5449370A/en not_active Expired - Lifetime
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1994
- 1994-05-10 CA CA002123271A patent/CA2123271C/en not_active Expired - Fee Related
- 1994-05-11 ES ES94303387T patent/ES2250963T3/es not_active Expired - Lifetime
- 1994-05-11 DE DE69434526T patent/DE69434526T2/de not_active Expired - Fee Related
- 1994-05-11 EP EP94303387A patent/EP0624346B1/en not_active Expired - Lifetime
- 1994-05-11 GR GR940100237A patent/GR1002520B/el not_active IP Right Cessation
- 1994-05-11 AT AT94303387T patent/ATE308280T1/de not_active IP Right Cessation
- 1994-05-12 JP JP6122004A patent/JPH0751281A/ja active Pending
- 1994-05-12 AU AU63059/94A patent/AU671013B2/en not_active Ceased
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| Publication number | Publication date |
|---|---|
| CA2123271C (en) | 2005-10-18 |
| JPH0751281A (ja) | 1995-02-28 |
| AU6305994A (en) | 1994-11-17 |
| EP0624346A2 (en) | 1994-11-17 |
| US5449370A (en) | 1995-09-12 |
| DE69434526T2 (de) | 2006-07-20 |
| CA2123271A1 (en) | 1994-11-13 |
| GR1002520B (el) | 1997-01-23 |
| DE69434526D1 (de) | 2005-12-08 |
| EP0624346B1 (en) | 2005-11-02 |
| ATE308280T1 (de) | 2005-11-15 |
| EP0624346A3 (en) | 1995-09-20 |
| AU671013B2 (en) | 1996-08-08 |
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