ES2400337T3 - Grapa cargada direccionalmente - Google Patents
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- ES2400337T3 ES2400337T3 ES10155752T ES10155752T ES2400337T3 ES 2400337 T3 ES2400337 T3 ES 2400337T3 ES 10155752 T ES10155752 T ES 10155752T ES 10155752 T ES10155752 T ES 10155752T ES 2400337 T3 ES2400337 T3 ES 2400337T3
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/0682—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
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- A—HUMAN NECESSITIES
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- A61B17/00—Surgical instruments, devices or methods
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- A—HUMAN NECESSITIES
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- A61B17/00—Surgical instruments, devices or methods
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/0682—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
- A61B17/0684—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil having a forming anvil staying above the tissue during stapling
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- A—HUMAN NECESSITIES
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- A61B17/0686—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil having a forming anvil staying below the tissue during stapling
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- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
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- A—HUMAN NECESSITIES
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- A61B17/00—Surgical instruments, devices or methods
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B17/07207—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously the staples being applied sequentially
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Abstract
Un cartucho (102, 154, 202, 302) con grapas quirúrgicas cargadas direccionalmente en el mismo, las grapas paraser expulsadas desde el cartucho a cavidades formadas en un yunque, de manera que las cavidades deforman lasgrapas en una configuración sustancialmente en forma de B, en el que el yunque y el cartucho están destinados acomprimir tejido entre ellos cuando el yunque y el cartucho son colocados en una posición aproximada,comprendiendo cada grapa quirúrgica (50): un puente posterior (54); un par de patas deformables (52) que se extienden hacia abajo desde el puente posterior, estando destinadaslas patas a ponerse en contacto con las cavidades de yunque para la formación de la grapa; eincluyendo la grapa una zona de doblamiento (52, 55) que incluye las patas deformables, presentando la zonade doblamiento una sección transversal con una dimensión de base (b) y una dimensión de altura (h), siendomayor la dimensión de base que la dimensión de altura. en el que la dimensión de altura está en la dirección de doblamiento durante la formación de la grapa y la dimensión debase está en el cruce de patas, dirección de torsión de la grapa, caracterizado porque la región dedoblamiento define una razón de momentos de inercia de entre alrededor de 1.1 a alrededor de 3.0, en elque: razón de momentos de inercia >= momento de inercia sobre un eje y / momento de inercia sobre un eje xy en donde x designa la dimensión de base e y designa la dimensión de altura.
Description
Grapa cargada direccionalmente.
1. Campo técnico Esta invención se refiere a dispositivos de sujeción o sujetadores quirúrgicos formables, y, más concretamente, a un cartucho que tiene grapas formables cargadas o activadas direccionalmente para su uso con grapadoras quirúrgicas
10 dotadas de cavidades de yunque destinadas a dar forma o moldear las grapas.
2. Antecedentes de la técnica relacionada Los instrumentos de grapado quirúrgico se han vuelto críticos para muchos procedimientos quirúrgicos que permiten salvar vidas. Usualmente, las grapas quirúrgicas se insertan mecánicamente en tejido mediante instrumentos de
15 grapado quirúrgico tales como los conocidos como dispositivos de anastomosis, que incluyen dispositivos de anastomosis gastrointestinal y dispositivos de anastomosis transversal. En tales dispositivos las grapas se cargan en un cartucho formando una o más filas alargadas. Se acciona un mecanismo para empujar o impulsar y conducir la grapa, a través de dos o más secciones de tejido, en dirección a un yunque de deformación. Una vez terminada la operación de impulsión, las patas de cada grapa se fijan o doblan, convencionalmente, mediante el yunque,
20 proporcionándoles una configuración cerrada con el fin de concluir la sutura y unir las secciones de tejido. Los dispositivos del tipo de anastomosis gastrointestinal impulsan y doblan secuencialmente las grapas alineadas en una fila, de acuerdo con una secuencia rápida, mientras que los dispositivos del tipo de anastomosis transversal impulsan y doblan todas las grapas simultáneamente. Véanse, por ejemplo, las patentes norteamericanas números 4,520,817 y 4,383,634. Los dispositivos del tipo de anastomosis circular aplican en tejido, simultáneamente, filas
25 anulares de grapas. Véase, por ejemplo, la patente norteamericana nº 4,304,236.
Un tipo de grapa convencional 20, mostrada en las figuras 1-3, usada con dispositivos de grapado quirúrgico tanto del tipo de anastomosis gastrointestinal como de anastomosis transversal se hace de acero inoxidable o titanio. La grapa 20 sin deformar (figura 1) presenta generalmente forma de U e incluye un puente posterior 22 y dos patas 2430 que se extienden sustancialmente en dirección perpendicular hacia abajo, desde el puente posterior. Cada pata 24 presenta un extremo biselado afilado destinado a perforar órganos o tejido corporal. El extremo biselado, también, permite generar par en la grapa, permitiendo su formación. La grapa atraviesa el tejido por un lado para aplicarse con un yunque separado y posicionado en el lado opuesto del tejido. La grapa se dobla haciendo que las patas se apliquen con un yunque 25 siguiendo el curso del mismo con el fin de dar forma o moldear una grapa cerrada 28 en
35 forma de B, como muestra la figura 2A. De acuerdo con esta configuración cerrada, el tejido se comprime entre las patas y el puente posterior de la grapa.
Debido a su sección transversal sustancialmente circular (figura 3), estas grapas convencionales requieren aproximadamente la misma fuerza para darle a la grapa su forma final, para retorcerla o para darla forma o
40 moldearla defectuosamente.
Por ejemplo, con referencia de nuevo a la figura 3, una grapa de sección transversal redonda convencional presenta un momento de inercia (Ix) con respecto a la dimensión x de formación dado por la ecuación:
45 Ix = 1/4 r4
Su momento de inercia (Iy) con respecto a la dimensión y de torsión viene dado por la misma ecuación:
Iy = 1/4 r4
Usando alambre redondo con diámetro uniforme de 0,009 pulgadas (r = 0,0045).
Ix = Iy = 1/4 (0,0045)4 = 3,22 x 10-10 pulgadas4
55 La razón de momentos de inercia es como sigue:
Iy/Ix = 3,22x10-10 pulgadas4 / 3,22x10-10 pulgadas4 = 1
Con el fin de garantizar una formación precisa y consistente de estas grapas convencionales, se ha realizado una
60 investigación y un desarrollo considerables en los campos de estructuras de formación y de impulsión. Por ejemplo, se han desarrollado yunques con revestimientos y/o estructura específicos (véanse, por ejemplo, las patentes norteamericanas nos. 5,173,133 y 5,480,089. Asimismo, se han configurado cartuchos de grapas con estructura de impulsión que permite equilibrar las fuerzas encontradas durante la formación de la grapa. Véase la patente norteamericana cedida en común nº 4,978,049 de Green. Así, con el fin de controlar y garantizar una formación de grapa consistente, sin torsión ni deformación, se han puesto en práctica tolerancias de fabricación extremadamente estrictas.
En la técnica anterior pueden encontrarse, también, otros tipos de grapas para diferentes tipos de instrumentos.
5 Algunas presentan sección transversal no circular. Las figuras 4, 4A y 4B muestran, a modo de ejemplo, una grapa de este tipo comercializada por United States Surgical, de Norwalk, Connecticut, EE.UU., para uso con sus grapadoras Multifire Endo Hernia y Endo Universal 65. El yunque de estas grapadoras, como muestran las figuras 4C y 4D, es adyacente al puente posterior de la grapa al aproximarse al tejido desde sólo un lado. A diferencia de las grapas descritas en lo que antecede, que se forman por contacto de las patas de grapa con cavidades de
10 yunque, estas patas de grapa se doblan en torno a un yunque que apoya contra el puente posterior. Esta grapa presenta una parte lateral H con una dimensión de altura mayor que la dimensión de la parte de base B (a saber, 0,020 pulgadas y 0,015 pulgadas, respectivamente).
La razón de momentos de inercia viene dada por la ecuación:
I y Momento de inercia respecto al eje de torsión
15 Razón de momentos de inercia = =
I x Momento de inercia respecto al eje de formación
Siendo
Ix = (1/12)bh3
Iy = (1/12)hb3,
h = 0,020 pulgadas
20 b = 0,015 pulgadas Por tanto Ix = (1/12)(0,015)(0,020)3 = 1,0x10-8 pulgadas4 Iy = (1/12)(0,020)(0,015)3 = 6,0x10-9 pulgadas4.
25 Por consiguiente,
Razón de momentos de inercia = 6,0x10-9 pulgadas4 / 1,0x10-8 pulgadas4 = 0,60
Esta grapa está configurada, específicamente, para acomodar torsión durante su formación, con el fin de permitir a 30 las patas de la grapa cruzarse, como muestra la figura 4E. Así, está prevista de manera que la fuerza para dar forma
o moldear la grapa sea ligeramente mayor que la fuerza para darla forma o modearla defectuosamente o retorcerla. La formación se consigue al doblar las patas de la grapa en torno a un yunque posicionado junto a la superficie interior 32 del puente posterior 34.
35 La patente norteamericana nº 5,366,479 describe una grapa de hernia con yunque adyacente que presenta una altura de 0,38 mm y un grosor de 0,51 mm. Esta grapa se forma del modo mostrado en las figuras 4C y 4D. De acuerdo con la fórmula precedente, la razón de momentos de inercia de esta grapa es la siguiente:
Ix = (1/12)(0,51)(0,38)3 = 2,33 X 10-3
Iy = (1/12)(0,38)(0,51)3 = 4,2 X 10-3
Razón de momentos de inercia = 4,2x10-3/2,33x10-3 = 1,8
45 Esta grapa, destinada al uso descrito, requeriría realmente una fuerza mayor para generar la forma deseada. De hecho, las patas de la grapa, probablemente, se pondrían en contacto, una con otra, antes de conseguir su configuración cruzada.
Por tanto, resulta evidente que este tipo de grapa de hernia, es decir, en la que el yunque es adyacente al puente
50 posterior al aproximarse al tejido desde sólo un lado, es muy diferente de la grapa de la presente invención, a saber, la grapa formada a modo de B, en la que las patas atraviesan el tejido para ponerse en contacto con las cavidades de yunque. Estas cavidades de yunque dirigen las patas de la grapa para darle a la grapa su configuración cerrada. Así la configuración y las consideraciones de torsión, doblamiento y formación de estas grapas de hernia son inaplicables a grapas dirigidas mediante cavidades de yunque, tales como las grapas en forma de B.
55 Por tanto, sería deseable ofrecer una configuración de grapa destinada a atravesar tejido y ponerse en contacto con una cavidad de yunque en el lado opuesto del tejido, que, mediante tecnología convencional de cartucho y yunque, promueva una formación de grapa correcta, reduzca la torsión/formación defectuosa causada por desalineación o tejido inusual y minimice la dependencia de tolerancias de fabricación estrictas. Sería deseable, también, ofrecer un
60 conjunto de yunque que minimice las formaciones defectuosas por desalineación o torsión durante la formación de la grapa.
El documento 0541950 describe una grapa maleable polimérica bioabsorbible que incluye un puente posterior con dos patas que dependen perpendicularmente del mismo, que están deformadas una respecto a la otra inicialmente y luego ascendentemente hacia el puente posterior de manera que las puntas extremas de cada pata se extiende al lado y pasado el puente posterior. La grapa tiene una forma transversal no circular. En consecuencia, las patas de la grapa conducidas hacia un yunque y recibidas en depresiones de cavidades son inicialmente dobladas una hacia la otra y luego dirigidas directamente hacia los lados opuestos del puente posterior.
El documento 0517975 describe una grapadora de sutura quirúrgica que utiliza un cartucho de grapas para contener sustancialmente grapas en forma de U, que pueden ser añadida de manera removible en un cartucho que posee medios situados entre dos mandíbulas o mordazas. Las grapas puede ser cargadas fácilmente dentro del cartucho de grapas retirando el cartucho de la grapadora. Cuando se cierran las mandíbulas entre las que se coloca el cartucho de la grapadora, las grapas del cartucho son descargadas e insertadas en los tejidos corporales o similares a ser suturados. Utilizando un cartucho de grapas magnetizado, las grapas de material metálico son retenidas magnéticamente dentro del cartucho de grapas.
El preámbulo de la reivindicación 1 está basado en este documento
COMPENDIO De acuerdo con la presente invención, se proporciona un cartucho que tiene grapas cargadas direccionalmente para uso con grapadoras quirúrgicas con estructura de yunque separada del cartucho y con cavidades de yunque contra las cuales se forme la grapa cuando las patas sean forzadas a ponerse en contacto con el yunque. La grapa cargada direccionalmente puede construirse de acuerdo con una amplia diversidad de configuraciones de sección transversal, por ejemplo, rectangular, elíptica, trapezoidal, etc. Todas las configuraciones se distinguen por presentar una zona de doblamiento que requiere más fuerza para retorcer o dar forma o moldear defectuosamente la grapa que para darla forma o moldearla apropiadamente. Estas grapas presentan razones de momentos de inercia del orden de entre, aproximadamente, 1,1 y, aproximadamente, 3,0. De acuerdo con otros aspectos, la grapa coincide con las grapas formadas convencionalmente, es decir, que presenten, al menos, un par de miembros de pata interconectados mediante una parte de corona, en las que los miembros de pata sean hechos poner en contacto con el yunque y sean formados mediante él. Características adicionales de la grapa de la presente invención se definen en la reivindicación 1.
BREVE DESCRIPCIÓN DE LOS DIBUJOS
En este documento se describen distintas realizaciones preferidas, con referencia a los dibujos, en los que:
la figura 1 muestra una vista lateral de una grapa convencional conocida en la técnica;
la figura 2A muestra una vista lateral de la grapa de la figura 1 con una configuración a modo de “B”;
las figuras 2B, 2C y 2D ilustran la formación de la grapa de la figura 2 cuando las patas, después de atravesar tejido,
sean puestas en contacto con las cavidades del yunque;
la figura 3 es una vista, en sección transversal tomada por la línea 3-3, de la grapa de la figura 1;
la figura 4 es una vista, en perspectiva, de una grapa convencional con sección transversal rectangular, conocida en
la técnica, formada en torno a un yunque puesto en contacto con el puente posterior;
la figura 4A es una vista lateral de la grapa de la figura 4;
la figura 4B es una vista, en sección transversal tomada por la línea 4B-4B, de la grapa de la figura 4;
las figuras 4C, 4D y 4E ilustran la formación de la grapa de la figura 4 cuando las patas se doblen mediante el
empujador y el puente posterior se mantenga contra el yunque;
la figura 5 es una vista lateral de una grapa cargada direccionalmente de acuerdo con la presente invención;
la figura 6 es una vista, en perspectiva, de la grapa de la figura 5;
la figura 7 es una vista, desde arriba, de la grapa de la figura 5;
la figura 8 es una vista, en sección transversal tomada por la línea 8-8, de la grapa de la figura 5;
la figura 9A es una vista lateral de la grapa de la figura 5, una vez deformada para darle una configuración a modo
de “B”;
la figura 9B es una vista de extremo que muestra la coplanaridad de las secciones de la “B” de la grapa de la figura
9A;
las figuras 10A-10F son vistas laterales que muestran la formación de la grapa de la figura 5 cuando la grapa
atraviese tejido y las patas se pongan en contacto con las cavidades del yunque;
la figura 11A ilustra gráficamente la comparación de la torsión media (en pulgadas) en función del desplazamiento
de la grapa convencional de la figura 1 y la grapa nueva de la figura 5;
la figura 11B ilustra gráficamente la comparación de la torsión media (en %) en función del desplazamiento de la
grapa convencional de la figura 1 y la grapa nueva de la figura 5;
la figura 12A muestra una vista, en sección transversal, de otra realización de grapa cargada direccionalmente de
acuerdo con la presente invención;
la figura 12B muestra una vista, en sección transversal, de otra realización de grapa cargada direccionalmente de
acuerdo con la presente invención;
la figura 12C muestra una vista, en sección transversal, de otra realización de grapa cargada direccionalmente de
acuerdo con la presente invención;
la figura 13 muestra una vista, en sección transversal, de otra realización de grapa cargada direccionalmente de
acuerdo con la presente invención;
la figura 14 muestra una vista, en sección transversal, de otra realización de grapa cargada direccionalmente de
acuerdo con la presente invención;
la figura 15 muestra una vista, en perspectiva, de un dispositivo del tipo de anastomosis gastrointestinal endoscópica
destinado a disparar la grapa de la figura 5;
las figuras 16-16C muestran vistas ampliadas que ilustran la formación de una grapa mediante las cavidades del
yunque del instrumento de la figura 15;
la figura 17 muestra una vista, en perspectiva, de un dispositivo del tipo de anastomosis gastrointestinal destinado a
disparar la grapa de la figura 5;
la figura 18 muestra una vista, en perspectiva, de un dispositivo del tipo de anastomosis transversal destinado a
disparar la grapa de la figura 5;
la figura 18A muestra una vista ampliada del yunque de formación de grapa y de parte de la unidad de carga
desechable del dispositivo de la figura 18;
las figuras 18B y 18C muestran vistas ampliadas que ilustran la formación de una grapa mediante las cavidades de
yunque del instrumento de la figura 18A;
la figura 19 muestra una vista, en perspectiva, de un dispositivo del tipo de anastomosis circular destinado a disparar
la grapa de la figura 5;
la figura 19A muestra una vista ampliada del yunque de formación de grapa y de parte de la unidad de carga
desechable del dispositivo de la figura 19;
las figuras 19B y 19C muestran vistas ampliadas que ilustran la formación de una grapa mediante las cavidades de
yunque del instrumento de la figura 19A;
la figura 20 muestra una vista, en perspectiva, de otra realización de grapa cargada direccionalmente de acuerdo
con la presente invención;
la figura 21 muestra una vista en sección transversal tomada por la línea de sección 21-21 de la figura 20;
la figura 22 muestra una vista, en alzado frontal, de la grapa cargada direccionalmente mostrada en la figura 20, una
vez deformada la grapa para darle la configuración a modo de B,
la figura 23 muestra una vista, en alzado lateral, cuando se mira en la dirección de las flechas 23-23 de la figura 22;
la figura 24 muestra una vista, en perspectiva, de un yunque destinado a estar asociado con un dispositivo del tipo
de anastomosis gastrointestinal endoscópica;
la figura 25 muestra una vista ampliada de la zona de detalle indicada de la figura 24;
la figura 26 muestra una vista recortada parcial, desde arriba, del yunque mostrado en la figura 24;
la figura 27 muestra una vista en sección transversal tomada por la línea de sección 27-27 de la figura 26;
la figura 28 muestra una vista en sección transversal tomada por la línea de sección 28-28 de la figura 26;
la figura 29 muestra otra vista desde arriba, ampliada, de parte del conjunto de yunque mostrado en la figura 25;
la figura 29a muestra una vista en sección transversal tomada por la línea de sección 29a-29a de la figura 29;
la figura 29b muestra una vista en sección transversal tomada por la línea de sección 29b-29b de la figura 29;
la figura 29c muestra una vista en sección transversal tomada por la línea de sección 29c-29c de la figura 29;
la figura 29d muestra una vista en sección transversal tomada por la línea de sección 29d-29d de la figura 29;
la figura 29e muestra una vista en sección transversal tomada por la línea de sección 29e-29e de la figura 29;
la figura 29f muestra una vista en sección transversal tomada por la línea de sección 29f-29f de la figura 29; y
la figura 30 muestra un gráfico que ilustra deformación en función de fuerza de una grapa que se esté formando en
una cavidad del yunque mostrado en la figura 24.
DESCRIPCIÓN DETALLADA DE REALIZACIONES PREFERIDAS
En lo que sigue se describirán con detalle realizaciones preferidas de la grapa cargada direccionalmente descrita
mediante este documento, con referencia a los dibujos, en los que números de referencia similares designan
elementos idénticos o correspondientes en cada una de las distintas vistas.
Una grapa 50 cargada direccionalmente de acuerdo con la presente invención se ilustra en las figuras 5-9. Con referencia específicamente a las figuras 5-7, la grapa 50 presenta una configuración en U e incluye un par de patas 52 sustancialmente paralelas, conectadas mediante una parte de corona 54 con sendas zonas dobladas 55 entre ellas. Las patas se muestran perpendicularmente al puente posterior y son sustancialmente rectas a lo largo de su longitud. Las partes 56 que atraviesan tejido se forman, preferiblemente, junto al extremo distal de las patas 52. Estas partes atravesadoras 56 pueden presentar cualquier configuración conocida que facilite la introducción de las patas 52 en el tejido a grapar. Como muestra la figura 5, las partes 56 atravesadoras de tejido se forman, preferiblemente, a modo de bisel, con puntos 58 adyacentes a los lados que miran al interior de las patas 52.
En esta realización la sección transversal se forma, preferiblemente, con una configuración sustancialmente rectangular, como muestra la figura 8, designando x la dimensión de base (b), mayor, y designando y la dimensión de altura (h), menor, de la parte de corona de la grapa cuando esté posicionada con una configuración de U invertida, como muestra la figura 5. Tal como se usa en esta memoria, la grapa está destinada a ser formada en torno a la dimensión x (eje x). Así, como muestran las figuras 10A-10F, la grapa 50 se forma hacia abajo, en relación con la página.
Esta configuración de sección transversal puede conseguirse merced a cualquier método conocido, por ejemplo, extrusión, laminación, estampado, etc. Preferiblemente, esta configuración se consigue por laminación plana de material de alambre redondo por lados opuestos. De acuerdo con el proceso de fabricación, el material puede ser material prelaminado por el fabricante de alambre o puede ser material de alambre redondo que se lamine para
5 darle la configuración de sección transversal deseada por el fabricante de grapas.
El momento de inercia Iy de la configuración de sección transversal de la nueva grapa ilustrada en la figura 5 viene dado por la expresión: Iy = (1/12)(b)3(h)
Para una dimensión de base b = 0,010 pulgadas y una dimensión de altura h = 0,008 pulgadas,
Iy = (1/12)(0,010)3(0,008)
15 Iy = 6,67x10-10 pulgadas4 Ix viene dado por la ecuación: Ix = (1/12)(b)(h)3
Ix = (1/12)(0,010)(0,008)3
Ix = 4,26x10-10 pulgadas4
Por tanto, la razón de momentos de inercia (Iy/Ix) es
25 6,67x10-10 pulgadas4 / 4,26x10-10 pulgadas4 = 1,57
De manera similar, para una dimensión de base b = 0,012 pulgadas y una dimensión de altura h = 0,008 pulgadas, Ix = 1,0x10-9 pulgadas4 e Iy = 5,12x10-10 pulgadas4, que proporciona una razón de momentos de inercia de 1,95.
30 Dado que Iy define la magnitud que corresponde a la formación apropiada de la grapa al ser disparada, e Ix define la magnitud que corresponde a la torsión y/o la formación defectuosa, resulta evidente que las configuraciones cargadas o activadas direccionalmente proporcionan una fuerza de formación similar “desde el punto de vista funcional” a una grapa redonda convencional, mientras que requieren hasta dos veces más fuerza para retorcerlas o darlas forma o moldearlas defectuosamente cuando se comparan con grapas convencionales. Esta nueva grapa
35 proporciona una mejora sustancial en relación con las grapas convencionales.
La tabla 1 que sigue presenta, a modo de ejemplo, razones de momento de inercia para una pluralidad de tamaños y tipos de nuevas grapas cargadas o activadas convencionalmente destinadas a ser usadas con grapadoras quirúrgicas. Ciertamente, pueden contemplarse grapas de otras dimensiones siempre que presenten la nueva razón
40 de momentos de inercia descrita en esta memoria.
- Tamaño de grapa
- Altura Base Iy Ix Razón de momentos de inercia Iy/Ix
- 3,5 mm. Titanim
- 0,007 pulgadas (0,18 mm) 0,010 pulgadas (0,25 mm) 5,83x10-10 2,86x10-10 2,04
- 3,5 mm. Acero inox.
- 0,007 pulgadas (0,18 mm) 0,0115 pulgadas (0,29 mm) 8,87x10-10 3,29x10-10 2,70
- 3,8 mm. Acero inox.
- 0,007 pulgadas (0,18 mm) 0,010 pulgadas (0,25 mm) 5,83x10-10 2,86x10-10 2,04
- 4,8 mm. Titanim
- 0,009 pulgadas (0,23 mm) 0,14 pulgadas (0,36 mm) 2,00x10-9 8,51x10-10 2,35
- 4,8 mm. Titanim
- 0,007 pulgadas (0,18 mm) 0,0115 pulgadas (0,29 mm) 8,87x10-10 3,29x10-10 2,70
Por otro lado, como se ilustra en lo que sigue, cuando se consideran grapas de tamaño comparable, la nueva configuración de grapa ofrece más resistencia a la torsión sin que cambien las fuerzas de disparo.
Por ejemplo, el esfuerzo de torsión, -b, se define mediante la ecuación:
Mc
_b =
Iy
manteniéndose el momento M a un valor constante igual a 1 libra x pulgada.
Para una grapa redonda convencional de diámetro 0,009 pulgadas
M = 1 libras x pulgada; c = 0,0045 pulgadas; e Ix = Iy = 3,22 x 10-10 pulgadas4 de modo que
_b = (1,0 libras x pulgada)(0,045 pulgada) / 3,22 x 10-10 pulgada4 _b = 13.975 ksi
Para la grapa cargada direccionalmente de la figura 8, en la que b = 0,010 pulgadas y h = 0,008 pulgadas
M = 1,0 libras x pulgada; c = 0,005 pulgadas; e Iy = 6,67 x 10-10 pulgada4
_b = (1,0 libras x pulgada)(0,005 pulgadas) / 6,67x10-10 pulgada4 _b = 7.496 ksi
Así pues, esta realización de la nueva grapa no sólo es más resistente a la torsión y/o la formación defectuosa, a saber, 14.000 ksi para la grapa convencional contra 7.500 ksi para la nueva grapa, sino que, también, mantiene fuerzas de disparo mínimas. La grapa cargada direccionalmente es efectivamente insensible a los efectos de desalineación durante la formación de grapa, mientras que mantiene una fuerza de disparo mínima. Este diseño inteligente direccionalmente permite reducir las formaciones defectuosas causadas por desalineación o torsión, así como reducir la necesidad de tolerancias de fabricación muy precisas de yunques y cubetas de formación de yunques, cartuchos, etc.
Las ventajas de la nueva grapa pueden apreciarse, también, con referencia a los gráficos de las figuras 11A y 11B. Como las grapas son forzadas a través de tejido grueso y el cartucho de grapas y el yunque pueden flexionar cuando el tejido sea comprimido y pueden moverse ligeramente uno en relación con otro, puede verse afectado el punto de contacto entre las puntas de las patas de la grapa y el yunque. Por ejemplo, si el yunque se mueve ligeramente, desalineándose, las patas de la grapa se pondrán en contacto con un punto diferente del yunque, lo que puede afectar a la formación uniforme de la grapa. Además, debido a las tolerancias de fabricación, las puntas de una grapa pueden no ponerse en contacto con el yunque en la posición óptima exacta. Aunque tal formación de grapa es satisfactoria y efectiva desde el punto de vista clínico, la nueva grapa de la presente aplicación proporciona una formación más uniforme de la fila de grapas, permite acomodar tolerancias de fabricación y es más resistente a la torsión. En otros términos, la grapa tendrá tendencia a doblarse en la dirección de la dimensión más delgada, lo que es deseable, puesto que, en este caso, la dimensión más delgada define la dirección de doblamiento deseada. Al relajar las tolerancias de fabricación, se reduce, también, el coste de fabricación.
Como muestra la figura 11A, la grapa redonda de la técnica anterior, al ser iguales su altura y su anchura, puede retorcerse en diferentes direcciones si la grapa y el yunque están desalineados. Por tanto, la dirección de torsión no puede ser controlada. En cambio, la razón de momentos de inercia de la nueva grapa de la presente invención permite minimizar la torsión. Se hace notar que la grapa de la técnica anterior no solamente presenta más torsión inicialmente, sino que, a medida que el desplazamiento aumenta, la torsión de la grapa es mayor para cualquier grado de desplazamiento. El porcentaje de torsión se define como (x/d)100 %, siendo x el desplazamiento del eje geométrico de la grapa y d el diámetro (o anchura) de la grapa).
Las figuras 12 a 14 ilustran configuraciones alternativas de sección transversal cargadas o activadas direccionalmente de acuerdo con la invención. Todas estas configuraciones de sección transversal presentan razones de aspecto del orden de entre, aproximadamente, 1,1 y, aproximadamente, 3,0, designando el eje x la dimensión de base (b), mayor, y el eje y la dimensión de altura (h), menor, en cada una de estas secciones transversales.
Las figuras 15 a 19 muestran, a modo de ejemplo, distintos tipos de grapadoras quirúrgicas que pueden utilizar las nuevas grapas cargadas o activadas direccionalmente. Se contemplan, también, otros tipos de grapadoras quirúrgicas.
La figura 15 muestra una grapadora secuencial endoscópica 100 conocida que incluye un yunque 110 y un cartucho 102 con nuevas grapas 50 cargadas o activadas direccionalmente. Con referencia a las figuras 16 a 16C, con el yunque 110 y el cartucho 102 de grapas en posición abierta (figura 16), el tejido 120 se posiciona entre el yunque 110 y el cartucho 102 (figura 16A). A continuación, el yunque 110 es hecho pivotar, en la dirección indicada mediante la flecha “A”, hacia el cartucho 102 (figura 16B), de manera conocida, con el fin de comprimir el tejido 120 entre el yunque 110 y el cartucho 102 de grapas. Después, las grapas 50 son eyectadas del cartucho 102 de grapas contra las cavidades 122 formadas en el yunque 110. Las cavidades 122 deforman las grapas 50, dándoles una configuración sustancialmente en B (figura 16C). Ahora, el yunque 110 puede ser hecho pivotar a la posición abierta de manera que el tejido 120 pueda ser retirado de la grapadora 100.
La figura 17 ilustra una grapadora secuencial 150 de tipo abierto conocida que incluye un yunque 152 y un cartucho 154 con grapas cargadas o activadas direccionalmente. La eyección de grapas a partir de la grapadora tiene lugar de manera similar a la descrita en las figuras 16-16C, y no se describirá con más detalle.
La figura 18 ilustra una grapadora 200 quirúrgica de tipo transversal conocida que incluye un yunque 210 y un cartucho 202 con nuevas grapas 50 cargadas o activadas direccionalmente. Con referencia a las figuras 18A-18C, estando el yunque 210 y el cartucho 202 de grapas en posición abierta, se posiciona el tejido 220 entre ambos (figura 18A). A continuación, el yunque 210 es movido en la dirección indicada mediante la flecha “B”, aproximándolo al cartucho 202 (figura 18B), de manera conocida, con el fin de comprimir el tejido 220 entre el yunque 210 y el cartucho 202 de grapas. Después, las grapas 50 son eyectadas del cartucho 202 de grapas contra las cavidades 222 formadas en el yunque 210. Las cavidades 222 deforman las grapas 50 dándoles una configuración sustancialmente en B (figura 18C). Ahora, el yunque 210 puede ser movido a la posición abierta de manera que el tejido 220 pueda ser retirado de la grapadora 200.
La figura 19 muestra una grapadora circular 300 que incluye un yunque 310 y un cartucho 302 con las nuevas grapas 50 cargadas o activadas direccionalmente. Con referencia a las figuras 19A-19C, estando el yunque 310 y el cartucho 302 de grapas en posición abierta, se posiciona el tejido 320 entre ambos (figura 19A). Ahora, el yunque 310 es movido hacia el cartucho 302, de manera conocida, con el fin de comprimir el tejido 320 entre el yunque 310 y el cartucho 302 de grapas (figura 19B). A continuación, las grapas 50 son eyectadas del cartucho 302 de grapas contra las cavidades 322 formadas en el yunque 310. Las cavidades 322 deforman las grapas 50 dándoles una configuración sustancialmente en B (figura 19C). Ahora, el yunque 110 puede ser movido a la posición abierta de manera que el tejido 320 pueda ser retirado de la grapadora 300.
Las figuras 20 a 23 ilustran otra realización preferida de la grapa cargada direccionalmente descrita, mostrada generalmente mediante la referencia 400. La grapa 400 cargada direccionalmente incluye una parte de corona 410 y un par de patas 412 que forman ángulo hacia fuera, con una zona de doblamiento 414. Las patas 412 definen un ángulo de entre, aproximadamente, 5º y, aproximadamente, 15º con la parte de corona 410. Preferiblemente, las patas 412 definen un ángulo de, aproximadamente, 9º con la parte de corona 410. Pueden preverse, alternativamente, otras orientaciones angulares. El ángulo de las patas 412 está destinado a retener la grapa dentro de ranuras receptoras de grapas de un cartucho de grapas antes de su uso, es decir, las patas 412 se aplican, con fricción, con las paredes de las ranuras de un cartucho de grapas, con el fin de retener cada grapa dentro de una ranura del cartucho. Hay formadas partes 416 atravesadoras de tejido en el extremo distal de las patas 412, y, preferiblemente, presentan forma de bisel con puntos 418 adyacentes a los lados que miran al interior de las patas
412. Con referencia a la figura 21, la grapa 400 presenta una sección transversal con superficies superior e inferior 420 y 422 planas y superficies laterales 424 y 426 semicirculares. Preferiblemente, esta sección transversal se consigue por laminación de material de alambre para proporcionarle las superficies superior e inferior. Alternativamente, pueden usarse otros métodos para dar forma o moldear la grapa 400, que incluyen extrusión y estampado. Mediante las fórmulas apropiadas se obtiene una razón de momentos de inercia de la grapa 400 igual a, aproximadamente, 2. Alternativamente, pueden modificarse las dimensiones de la grapa 400 con el fin de conseguir una razón de momentos de inercia dentro del margen preferido de, aproximadamente, 1,1 y, aproximadamente, 3. Las figuras 22 y 23 muestran la grapa 400 en el estado formado, en el que la grapa 400 presenta una configuración a modo de B.
Hay varios métodos para fabricar la grapa quirúrgica. Por ejemplo, el método podría incluir las etapas de aplanar por laminación el material de alambre para dar forma o moldear, al menos, una superficie plana en él, y cortar un trozo de material de alambre redondo de una longitud predeterminada que corresponda a la longitud deseada de una grapa acabada o extrudir el material con una superficie plana. El material se dobla para darle una forma que presente un puente posterior y un par de patas, de manera que la grapa tenga una razón de aspecto de entre, aproximadamente, 1,1 y, aproximadamente, 3,0.
Las figuras 24-28 muestran un yunque 500 destinado a estar asociado con una grapadora quirúrgica de tipo transversal, tal como la mostrada en la figura 18. El yunque 500 incluye una pluralidad de cavidades 510 de grapa formadas en su superficie. Cada cavidad 510 de grapa incluye una primera y una segunda cubetas 512 y 514 de formación de grapa y una superficie de canalización 516 prevista en torno a cada una de las cubetas de formación de grapa. Un yunque que incluye una cavidad de formación de grapa de este tipo ha sido descrito en la patente estadounidense nº 5,480,089 presentada el 19 de agosto de 1994. El yunque 500, que incluye cubetas 512 y 514 de formación de grapa y superficie de canalización 516 puede adaptarse para ser usado con cualquiera de los dispositivos de grapado quirúrgico descritos en lo que antecede, que incluyen dispositivos del tipo de anastomosis gastrointestinal endoscópica (figura 15), dispositivos del tipo de anastomosis gastrointestinal (figura 17), dispositivos del tipo de anastomosis transversal (figura 18) y dispositivos del tipo de anastomosis circular (figura 19). La solicitud de patente estadounidense con número de serie 09/687.815 presentada el 13 de octubre de 2000, describe un dispositivo del tipo de anastomosis transversal que incluye dicho conjunto de yunque.
Las figuras 29 a 29f muestran con mayor detalle el conjunto de yunque 500 mostrado en las figuras 24 a 28. El conjunto de yunque 500 incluye una placa 508 de yunque que define una superficie 502 de contacto con tejido y que presenta una pluralidad de cavidades 510 de grapa formadas en la superficie 502 de la placa 508 de yunque. Como
se ha descrito anteriormente, cada cavidad 510 de grapa incluye una primera y una segunda cubetas 512 y 514 de formación de grapa y una superficie de canalización 516 formada en torno a, al menos, parte (preferiblemente la mayor parte) de cada una de las cubetas 512 y 514 de formación de grapa. Cada cubeta 512 y 514 de formación de grapa está definida por paredes laterales 520 y una superficie de base 518 alargada. Como muestra la figura 29a, cada cubeta 512, 514 de formación de grapa incluye una parte exterior O, una parte central C y una parte interior I. La parte exterior O se extiende desde la zona exterior de la cubeta de formación (mostrada en la figura 29f) hasta la parte central C de la cubeta de formación, en la parte más profunda de la cubeta de formación y en torno a ella (véanse los extremos de las líneas directrices de los números de referencia 512 y 514 en la figura 28). La parte interior I de cada cubeta de formación se extiende desde la parte central C de la cubeta de formación hasta el punto operativo más elevado de aplicación con la pata o punta de una grapa del vértice 515 de cada cavidad 510, o cerca de él (véase la figura 29a). La superficie de base 518 se extiende, axialmente, desde cerca de la zona exterior de las partes exteriores de cada una de las cubetas 512 y 514 de formación de grapa y termina en el vértice 515 de la cavidad 510 o cerca de él (véase, por ejemplo, la figura 29a).
La superficie de base alargada 518 es sustancialmente lineal, es decir, sustancialmente plana (entendiéndose que puede ser completamente plana), en dirección transversal y es cóncava o está curvada en dirección longitudinal. Preferiblemente, la superficie sustancialmente lineal corresponde a la forma de los puntos de una grapa a dar forma
o moldear contra ella. Como la grapa preferida presenta puntas sustancialmente lineales (véase la grapa 400 de las figuras 20-22), la superficie de base preferida para una grapa de este tipo es sustancialmente lineal. Ello permite un contacto de línea contra línea entre las superficies planas de las puntas de la grapa y la superficie de base sustancialmente lineal. Al prever una superficie de base con una forma que corresponda a la forma de los puntos de la grapa, se reduce la fricción y se minimiza el gripado de las puntas de la grapa durante la formación de la misma. La forma de la superficie de base 518 puede modificarse para adaptarse a la forma de los puntos de grapas diferentes, que puede ser redonda, triangular, etc.
Preferiblemente, las paredes laterales 520, que definen parcialmente las cubetas 512 y 514 de formación de grapas, se extienden desde la parte inferior de la superficie de canalización hasta la superficie de base 518 formando ángulo. Las paredes laterales 520 se vuelven progresivamente más verticales (o perpendiculares en relación con la superficie 502 de contacto con el tejido) a lo largo de la superficie de base 518 alargada, empezando por la zona exterior de la parte exterior O de las cubetas 512 y 514, en la que las paredes laterales 520 forman ángulo en mayor medida [(en relación con la superficie 502 de contacto con el tejido o con el eje vertical VA de la cavidad (figura 29f)] en dirección a la parte central C y la parte interior I, y a lo largo de ellas, de las cubetas 512 y 514. Preferiblemente, las partes central e interior de las cubetas 512 y 514 están definidas por paredes laterales 520 sustancialmente verticales (entendiéndose que pueden ser completamente verticales), de manera que se forme una trampa 522 sustancialmente vertical, al menos, en las partes central e interior de cada cubeta de formación de grapa. La trampa sustancialmente vertical puede empezar en cualquier posición adecuada del eje longitudinal de la cubeta 512, 514 de formación de grapa (figura 30). Aunque se prefiere que la trampa empiece en la parte exterior O de la cubeta de formación de grapa, antes de que se genere la primera fuerza máxima (figura 30), o durante la misma, pueden conseguirse también grapas formadas apropiadamente si la trampa sustancialmente vertical empieza en la parte central o interior de la cubeta de formación de grapa. En resumen, la trampa 522 sustancialmente vertical cumple la función de alinear y dar forma o moldear de modo preciso grapas en ella. La trampa sustancialmente vertical puede presentar cualquier longitud adecuada en función de, por ejemplo, las dimensiones y la configuración de la grapa y la cubeta de formación de grapa particulares, y de la configuración deseada de la grapa acabada. Preferiblemente, la longitud de la trampa sustancialmente vertical 522 puede variar entre, aproximadamente, 5r y, aproximadamente, 2r, siendo r el radio de curvatura de cada cavidad, y, más preferiblemente, la longitud de la trampa vertical es, aproximadamente, igual a r. Un radio r preferido puede variar entre, aproximadamente, 0,8 mm (aproximadamente 0,030 pulgadas) y, aproximadamente, 2,5 mm (aproximadamente 0,100 pulgadas), siendo, de modo más preferido igual a 1,3 mm (aproximadamente 0,05 pulgadas), entendiéndose que puede ser igual a 1,37 mm (0,054 pulgadas).
Con referencia a la figura 30, al dar forma o moldear una grapa contra un yunque, típicamente, la fuerza aplicada a la grapa aumentará a medida que la grapa penetre en la cavidad de grapa hasta que la fuerza sea suficiente como para curvar o deformar plásticamente la grapa. Esta fuerza máxima aplicada a la grapa se ilustra esquemáticamente en el gráfico de la figura 30 mediante la letra “X”, y, típicamente, tiene lugar cuando las puntas de las patas de una grapa se apliquen con la superficie de base 518, en la parte exterior de las cubetas 512 y 514, en la que las patas empiezan a deformarse plásticamente. Una primera fuerza máxima tiene lugar, típicamente, cuando las puntas de las patas de una grapa choquen contra la superficie de base 518 y se muevan, aproximadamente, entre las posiciones mostradas en las figuras 10B y 10C. Una segunda fuerza máxima, identificada mediante la letra “Y” en el gráfico de la figura 30, se aplica a la grapa para doblar sus patas hacia arriba. La segunda fuerza máxima Y tiene lugar, típicamente, cuando una parte de las patas de la grapa esté aplicada con la superficie de base 518, también en la parte exterior O, de las cubetas 512 y 514, aproximadamente entre las posiciones mostradas en las figuras 10D y 10E. Preferiblemente, las cavidades 510 de grapa del conjunto de yunque 500 están configuradas a modo de tolva que, preferiblemente, canalice gradualmente y dirija el movimiento de las puntas y las patas de una grapa a dar forma o moldear de manera que penetren en la trampa sustancialmente vertical, al menos, en el momento en que se alcancen las fuerzas máximas X e Y. La trampa sustancialmente vertical captura las puntas y las patas de las grapas, en su interior y a lo largo de ella, preferiblemente, cuando se generen las cargas máximas de formación de grapa. En este caso, capturar las puntas y las patas de una grapa significa que al menos una parte, preferiblemente
la parte de base, de las paredes laterales de la trampa sustancialmente vertical de la cubeta de formación de grapa limita estrechamente las puntas y las patas de la grapa en relación de ajuste deslizante, con el fin de minimizar el movimiento lateral o transversal de las puntas y las patas y de dirigir positivamente la grapa por la parte de trampa sustancialmente vertical de la cubeta de formación de grapa. De ese modo, se minimiza o elimina la formación defectuosa por desalineación o torsión de la grapa.
Las figuras 29b-29f muestran que las paredes laterales 520, con la superficie de base 518, forman una tolva que dirige gradualmente las puntas y las patas de una grapa desde la parte exterior O de las cubetas 512 y 514 de manera que penetren en una trampa sustancialmente vertical en las partes exterior, central e interior O, C e I, respectivamente, de las cubetas, y termina en el vértice 515 de las cubetas 512 y 514 o cerca de él.
La figura 29f muestra que la parte exterior O de la cubeta de formación 514 de grapa forma ángulo en mayor medida en relación con la superficie 502 de contacto con tejido o el eje vertical VA, con el fin de proporcionar una zona objetivo grande destinada a recibir las puntas de las patas de una grapa cuando sea disparada contra la cavidad 510 del yunque.
La figura 29e, tomada, también, por la parte exterior O de la cubeta de formación 514, muestra que las paredes laterales 520 forman un ángulo más cerrado en relación con el eje vertical VA, para guiar más estrechamente las puntas y las patas de una grapa en la cubeta de formación 514.
La figura 29d muestra que las paredes laterales 520 en la parte interior I, aunque formen un ángulo de aproximadamente 8º en relación con el eje vertical VA, son sustancialmente verticales. En las figuras 29b y 29c, las paredes laterales se muestran verticales. Idealmente y del modo más preferido, una parte importante de las paredes laterales 520 de las trampas sustancialmente verticales es realmente vertical. Debe entenderse que al tratar de conseguir una pared lateral vertical, que las paredes laterales sean realmente verticales o bien sustancialmente verticales puede depender del modo en que se hagan las cavidades del yunque. Preferiblemente, por razones económicas y facilidad de fabricación, el yunque se hace a partir de una lámina delgada de metal y las cavidades se estampan en él. Al existir cierta recuperación, es decir, cierta deformación elástica, al formar una cubeta por estampación, en algunos casos las paredes laterales de las cubetas, realmente, serán sustancialmente verticales. Típicamente, si el yunque se hace por moldeo o mecanizado, las paredes verticales serán verdaderamente verticales. Así, de acuerdo con la invención, el objeto consiste en ofrecer una tolva que canalice y guíe las puntas y las patas de una grapa de manera que penetren en una trampa alargada sustancialmente vertical que atrape o capture y dirija positivamente las puntas y las patas de una grapa a la trampa sustancialmente vertical, y a través de ella, en su trayectoria hacia el vértice o su proximidad al dar forma o moldear la grapa. Aunque se prefiera que las paredes laterales de las cubetas de formación de grapa que conducen a la trampa sustancialmente vertical formen ángulo, ello no es esencial. Tales paredes laterales y/o partes superiores de las paredes laterales de la trampa sustancialmente vertical pueden ser arqueadas (referencia 520’ de la figura 29g) o pueden estar configuradas de otro modo, siempre que lo bastante de la altura de las paredes laterales de la trampa sustancialmente vertical, o de una parte inferior de las mismas, por ejemplo, “L”, sea sustancialmente vertical, con el fin de atrapar la grapa. Se contempla que la expresión “lo bastante de la altura de las paredes laterales o de una parte inferior de las mismas” signifique que la altura sea, al menos, aproximadamente, 1/2 del grosor o del diámetro de la grapa particular a dar forma o moldear. Se contempla que las paredes sustancialmente verticales formen ángulo inferior a, aproximadamente, 20º en relación con el eje vertical, de modo preferido, inferior a, aproximadamente, 15º, y, del modo más preferido, inferior a, aproximadamente, 10º.
Aunque se han tratado de explicar los parámetros de principio, longitud, configuración y fin de la trampa vertical y la disposición sustancialmente vertical de las paredes laterales, debe entenderse que estos parámetros pueden variar en función de distintos factores, por ejemplo, la configuración inicial de grapa y sus dimensiones y forma final deseada, en tanto que el principio de captura de las puntas y patas de una grapa en una trampa sustancialmente vertical se tenga presente o se emplee para capturar y dirigir positivamente el movimiento y la dirección de la grapa con el fin de optimizar la formación apropiada de la misma.
El empleo de trampas sustancialmente verticales en cubetas de formación de grapas, especialmente las que presenten una superficie de base sustancialmente lineal, es especialmente ventajoso para uso en relación con las grapas cargadas o activadas direccionalmente descritas en este documento, particularmente las que estén dotadas de puntas sustancialmente lineales. Esta combinación es particularmente eficaz para compensar variaciones en los sistemas de fabricación y formación de grapas con el fin de minimizar la incidencia de grapas formadas defectuosamente, incluso las formadas defectuosamente por variaciones de la densidad del tejido a grapar, de la forma de grapa, de la geometría o del material, y de la configuración de las puntas de la grapa, por ejemplo, angular irregular o redondeada.
Aunque realizaciones específicas de la presente invención han sido descritas anteriormente con detalle, se entenderá que esta descripción es simplemente con fines de ilustración. Varias modificaciones y estructuras equivalentes que corresponden a los aspectos descritos de la realización preferida en adición a los descritos anteriormente pueden ser realizadas por los expertos en la técnica sin apartarse del alcance de la presente invención que viene definida por las siguientes reivindicaciones.
Claims (13)
- REIVINDICACIONES1. Un cartucho (102, 154, 202, 302) con grapas quirúrgicas cargadas direccionalmente en el mismo, las grapas para ser expulsadas desde el cartucho a cavidades formadas en un yunque, de manera que las cavidades deforman las grapas en una configuración sustancialmente en forma de B, en el que el yunque y el cartucho están destinados a comprimir tejido entre ellos cuando el yunque y el cartucho son colocados en una posición aproximada, comprendiendo cada grapa quirúrgica (50):un puente posterior (54); un par de patas deformables (52) que se extienden hacia abajo desde el puente posterior, estando destinadas las patas a ponerse en contacto con las cavidades de yunque para la formación de la grapa; e incluyendo la grapa una zona de doblamiento (52, 55) que incluye las patas deformables, presentando la zona de doblamiento una sección transversal con una dimensión de base (b) y una dimensión de altura (h), siendo mayor la dimensión de base que la dimensión de altura. en el que la dimensión de altura está en la dirección de doblamiento durante la formación de la grapa y la dimensión de base está en el cruce de patas, dirección de torsión de la grapa, caracterizado porque la región de doblamiento define una razón de momentos de inercia de entre alrededor de 1.1 a alrededor de 3.0, en el que:razón de momentos de inercia = momento de inercia sobre un eje y / momento de inercia sobre un eje xy en donde x designa la dimensión de base e y designa la dimensión de altura.
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- 2.
- El cartucho de la reivindicación 1, en el que la zona de doblamiento es sustancialmente rectangular o achatada en la sección transversal, preferiblemente en el que la parte de doblamiento de la grapa es sustancialmente rectangular en la sección transversal con una dimensión de base mayor que la dimensión de altura.
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- 3.
- El cartucho de la reivindicación 1 ó de la reivindicación 2, en el que la grapa se hace de un material seleccionado del grupo que consiste en titanio y acero inoxidable, preferiblemente en el que la zona de doblamiento está hecha de titanio y presenta una razón de momentos de inercia de entre, aproximadamente, 2,0 y, aproximadamente, 2,7, y preferiblemente en el que la zona de doblamiento está hecha de acero inoxidable y presenta una razón de momentos de inercia entre, aproximadamente, 2,0 y, aproximadamente, 2,7. .
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- 4.
- El cartucho de la reivindicación 1, ó de la reivindicación 2, ó de la reivindicación 3, en el que a la zona de doblamiento se le da una forma que corresponde, sustancialmente al grupo de formas consistente en una elipse, un trapezoide, un triángulo o un semicírculo, preferiblemente en el que a la parte de doblamiento de la grapa se le da una forma que corresponde, sustancialmente al grupo de formas consistente en una elipse, un trapezoide o un semicírculo.
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- 5.
- El cartucho de la reivindicación 1, ó de la reivindicación 2, ó de la reivindicación 3, en el que al menos una parte de las patas de la grapa tiene una sección transversal sustancialmente rectangular.
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- 6.
- El cartucho de cualquiera de las reivindicaciones 1 a 5, que comprende además una estructura atravesadora (56) formada en una parte extrema distal de al menos una de las patas de cada grapa, preferiblemente en el que la estructura atravesadora es una punta (58) o extremo apuntado en un lado interior de la pata.
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- 7.
- El cartucho como en cualquiera de las reivindicaciones 1 a 6, en el que las patas de la grapa son sustancialmente rectas a lo largo de su longitud.
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- 8.
- El cartucho como en cualquiera de las reivindicaciones 1 a 7, en el que cada una de las patas presenta un extremo distal formado a modo de bisel con una punta (58) adyacente a un lado interior de la pata.
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- 9.
- El cartucho de una cualquiera de las reivindicaciones precedentes, en el que la grapa está hecha de un material seleccionado del grupo consistente en titanio o acero inoxidable.
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- 10.
- El cartucho de cualquiera de las reivindicaciones precedentes, en el que cada grapa (400) tiene unas patas en ángulo hacia fuera (412), preferiblemente con un ángulo de entre 5º a alrededor de 15º con respecto al puente posterior (415).
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- 11.
- Una grapadora quirúrgica (100) que comprende:
un yunque (110) que tiene una pluralidad de cavidades de yunque (510); el cartucho de grapas (102) de acuerdo con una cualquiera de las reivindicaciones precedentes en el que el tejido es comprimido entre el yunque y el cartucho de grapas cuando el yunque y el cartucho son colocados en una posición aproximada; un empujador destinado a ser puesto en contacto con la grapa e impulsarla contra el yunque de manera que5 cada pata de la grapa se ponga en contacto con una cavidad del yunque, con el fin de dar forma o moldear la grapa. - 12. La grapadora quirúrgica de la reivindicación 11, en la que la estructura para impulsar las grapas quirúrgicas está configurada para impulsar las grapas contra el yunque de manera simultánea.
- 13. La grapadora quirúrgica de la reivindicación 11, en la que la estructura para impulsar las grapas quirúrgicas está configurada para impulsar las grapas contra el yunque de manera secuencial.
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| US69337900A | 2000-10-20 | 2000-10-20 | |
| US693379 | 2000-10-20 |
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| ES2400337T3 true ES2400337T3 (es) | 2013-04-09 |
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| ES01987644T Expired - Lifetime ES2343513T3 (es) | 2000-10-20 | 2001-10-19 | Conjunto de yunque para dar forma a una grapa. |
| ES10155752T Expired - Lifetime ES2400337T3 (es) | 2000-10-20 | 2001-10-19 | Grapa cargada direccionalmente |
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| ES01987644T Expired - Lifetime ES2343513T3 (es) | 2000-10-20 | 2001-10-19 | Conjunto de yunque para dar forma a una grapa. |
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| DE (1) | DE60141851D1 (es) |
| ES (2) | ES2343513T3 (es) |
| WO (1) | WO2002032322A2 (es) |
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2001
- 2001-10-05 US US09/972,594 patent/US20040267310A1/en not_active Abandoned
- 2001-10-19 EP EP10155752A patent/EP2191778B1/en not_active Expired - Lifetime
- 2001-10-19 CA CA2426206A patent/CA2426206C/en not_active Expired - Fee Related
- 2001-10-19 CA CA2708384A patent/CA2708384C/en not_active Expired - Fee Related
- 2001-10-19 DE DE60141851T patent/DE60141851D1/de not_active Expired - Lifetime
- 2001-10-19 WO PCT/US2001/050721 patent/WO2002032322A2/en not_active Ceased
- 2001-10-19 JP JP2002535561A patent/JP4101650B2/ja not_active Expired - Lifetime
- 2001-10-19 ES ES01987644T patent/ES2343513T3/es not_active Expired - Lifetime
- 2001-10-19 EP EP01987644A patent/EP1349503B8/en not_active Expired - Lifetime
- 2001-10-19 ES ES10155752T patent/ES2400337T3/es not_active Expired - Lifetime
- 2001-10-19 AU AU3290202A patent/AU3290202A/xx active Pending
- 2001-10-19 AU AU2002232902A patent/AU2002232902B2/en not_active Ceased
-
2003
- 2003-04-28 US US10/424,606 patent/US7824426B2/en not_active Expired - Lifetime
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2005
- 2005-10-17 US US11/253,493 patent/US7398907B2/en not_active Expired - Lifetime
-
2007
- 2007-04-02 AU AU2007201432A patent/AU2007201432B2/en not_active Ceased
- 2007-10-31 US US11/981,441 patent/US7611038B2/en not_active Expired - Fee Related
-
2008
- 2008-01-10 JP JP2008003753A patent/JP4714756B2/ja not_active Expired - Lifetime
-
2009
- 2009-04-02 AU AU2009201292A patent/AU2009201292B2/en not_active Ceased
- 2009-09-28 US US12/568,135 patent/US7926692B2/en not_active Expired - Fee Related
-
2010
- 2010-10-05 US US12/898,176 patent/US9517066B2/en not_active Expired - Fee Related
- 2010-10-28 JP JP2010242858A patent/JP2011056277A/ja not_active Withdrawn
-
2011
- 2011-03-21 US US13/052,289 patent/US8123101B2/en not_active Expired - Fee Related
-
2012
- 2012-02-08 US US13/368,407 patent/US8684249B2/en not_active Expired - Fee Related
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2014
- 2014-03-12 US US14/205,927 patent/US8905287B2/en not_active Expired - Fee Related
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