ES2114956T5 - Aparato para tratar tejido dañado. - Google Patents
Aparato para tratar tejido dañado. Download PDFInfo
- Publication number
- ES2114956T5 ES2114956T5 ES92925128T ES92925128T ES2114956T5 ES 2114956 T5 ES2114956 T5 ES 2114956T5 ES 92925128 T ES92925128 T ES 92925128T ES 92925128 T ES92925128 T ES 92925128T ES 2114956 T5 ES2114956 T5 ES 2114956T5
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- wound
- mentioned
- negative pressure
- vacuum
- sealing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Landscapes
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Abstract
LA INVENCION DESCUBIERTA ES UN METODO PARA EL TRATAMIENTO DE TEJIDO DAÑADO QUE CONSISTE EN APLICAR UNA PRESION NEGATIVA A UNA HERIDA CON UN TIEMPO Y MAGNITUD SUFICIENTES PARA PROVOCAR EL MOVIMIENTO DE TEJIDO Y ASI FACILITAR EL CIERRE DE LA HERIDA. EL METODO ES APLICABLE A HERIDAS, QUEMADURAS, HERIDAS INFECTADAS Y AÑADIDOS DE TEJIDOS VIVOS. TAMBIEN SE DESCUBREN CONFIGURACIONES DEL APARATO PARA LLEVAR A CABO EL METODO.
Description
Aparato para tratar tejido dañado.
La presente invención se refiere en general a
cicatrización de heridas, y más en concreto está dirigido aparatos
para tratar heridas que es improbable que cicatricen por completo
con métodos convencionales.
El tratamiento de heridas abiertas que son
demasiado grandes para cerrarse espontáneamente, ha sido un área
problemática durante muchos años. La cicatrización de heridas
necesita que el tejido epitelial y subcutáneo adyacente a la herida
migre hacia la herida, y eventualmente la cierre. Algunas heridas
son lo suficientemente grandes, o tan están infectadas, que es
improbable que se cierren espontáneamente. En tales casos, se forma
una zona de estasis, un área en la que la hinchazón localizada de
tejidos limita el flujo de sangre a estos tejidos, cerca de la
superficie de la herida. Sin el suficiente flujo de sangre, la
herida es incapaz de combatir con éxito la infección bacteriana y,
por consiguiente, es incapaz de cerrarse espontáneamente.
La técnica más común para la el cierre de
heridas abiertas, ha sido durante mucho tiempo el uso de suturas o
grapas. Estos métodos de cierre mecánico proporcionan tensión sobre
el tejido de la piel en el borde de la herida, que fomenta que los
tejidos epiteliales migren hacia la herida y la cubran. Si bien la
sutura y grapado de heridas se practica ampliamente, tienen un
inconveniente principal: la fuerza de tracción necesaria requerida
para conseguir el cierre con suturas o grapas, provoca tensiones muy
altas localizadas en los puntos de inserción de la sutura, lo que
tiene como resultado la ruptura del tejido en estos puntos. La
ruptura sustancial provocará eventualmente la dehiscencia en
algunas heridas, lo que tiene como resultado pérdidas adicionales
de tejido. Además, algunas heridas infectadas se endurecen e
inflaman hasta tal punto que no es viable el cierre mediante
sutura. Las heridas no reparables mediante sutura o grapado
necesitan generalmente hospitalizaciones prolongadas, con los
consiguientes altos costes y procedimientos quirúrgicos importantes,
tales como injertos de tejido circundante. Ejemplos de tales
heridas incluyen heridas grandes, profundas, abiertas, escaras de
decúbito resultantes de presión prolongada, ulceras resultantes de
osteomielitis crónica, y quemaduras de segundo grado que se
desarrollan subsiguientemente en quemaduras de tercer grado.
Hasta la fecha, no ha existido un método
satisfactorio de forma sistemática para tratar tales heridas. Lo
que se necesita es un método de cicatrización de la herida, sin las
tensiones localizadas que acompañan la sutura, mientras que a la
vez trate cualquier infección presente en la herida, con un solo
aparato para realizar el método. Tales método y aparato, reducirían
la hospitalización e incrementarían la probabilidad de cicatrización
de la herida.
El documento
WO-A-90/11 795 se refiere a un
sistema de comunicación por fluido, para drenaje de la herida o
introducción de fluido. El dispositivo comprende una membrana de
cubierta, que recubre una herida. El extremo próximo de un tubo,
comunica mediante fluido con la herida, a través de una abertura en
la membrana de cubierta. El dispositivo puede ser manejado para
evacuar o introducir fluidos, tanto de forma activa como pasiva.
Cuando es manejado en modo activo, el extremo distal del tubo está
conectado a una fuente de succión para drenar la herida, o a una
fuente de fluido para introducir fluido en la herida.
M.E. Chariker et al, en Contemporary
Surgery, Vol 34, junio de 1989, páginas 59-63, se
refieren a un aparato que proporciona drenaje de una herida por
succión cerrada.
La invención proporciona un aparato para
facilitar el calentamiento de una herida, de acuerdo con la
reivindicación 1. La realización de la invención comprende una
sección de espuma de polímero de células abiertas, configurada para
recubrir una herida, y un tubo flexible que tiene un extremo de
entrada y un extremo de salida, estando el mencionado extremo de
entrada insertado en la mencionada sección de espuma de polímero de
células abiertas. Una lámina flexible de polímero puede recubrir la
sección de espuma y los tubos, y estar configurada para adherirse a
la piel que rodea la herida.
Se seguirá describiendo la invención, a modo de
ejemplo, con referencia a los dibujos anexos en los cuales:
La figura 1 muestra una vista en sección
transversal, de un dispositivo de presión negativa que comprende
una pantalla de polímero de células abiertas, un tubo flexible que
conecta la sección de espuma con una bomba de succión, y una lámina
de polímero flexible que recubre el conjunto de tubo
flexible-espuma, para proporcionar el necesario
aislamiento; y
la figura 2 muestra una vista en sección
transversal, de un dispositivo de presión negativa que comprende
una pantalla poroso, un dobladillo hinchable unido a una copa
semi-rígida, y un tubo flexible que se extiende
desde una bomba de succión, hasta un punto dentro del volumen
sellado del conjunto de copa-dobladillo.
La presente invención se refiere a un aparato
para tratar lesiones en tejidos, acorde con la reivindicación 1. La
cicatrización de la herida necesita que el tejido epitelial y
subcutáneo migre, desde el borde de la herida hacia la herida. El
uso de presión negativa proporciona tensión sobre este tejido del
borde, que provoca la migración acelerada de tejido. Se ha
observado que el uso del aparato también provoca, dentro del tejido,
la formación incrementada de tejido de granulación, una matriz de
colágeno, fibronectina, y ácido hialurónico que lleva macrófagos,
fibroblastos y neovasculatura, que ayudan a la cicatrización.
El aparato acorde con la invención es
especialmente adecuado para ser utilizado en escaras de decúbito.
Una escara de decúbito es una herida que se desarrolla debido a una
presión compresiva constante, sobre la superficie de la piel y por
debajo del tejido. El flujo de sangre al tejido comprimido está
limitado, hasta el punto que el tejido suprayacente muere, y
subsiguientemente permite que se infecte el tejido subyacente. La
disminución del flujo de sangre a la herida, impide una reacción
inmune normal para combatir la infección, cuya presencia impide la
migración de tejido desde el borde de la herida. Las escaras de
decúbito se producen a menudo en pacientes postrados en cama, que
no son capaces de sentir las escara, o de moverse suficientemente
para liberar la presión de contacto. Tales heridas pueden llegar a
ser muy serias, necesitando repetidos y extensivos injertos de
piel; incluso a veces son fatales. Como se ha descrito arriba, la
aplicación de presión negativa a las escara permite que se produzca
la migración de tejido del borde de la herida, y así permite que las
escaras cicatricen sin estos procedimientos más drásticos.
La invención puede practicarse con la aplicación
sustancialmente continua de presión negativa, donde la presión se
libera solo para cambiar el vendaje de de la herida, o puede
practicarse con el uso de una aplicación cíclica de presión, en
periodos alternos de aplicación y no aplicación. La proporción del
periodo de aplicación frente al período de no aplicación, puede ir
desde tan solo número 1:10 hasta tanto como 10:1, pero más
preferente es de 1:1. Un esquema preferido consiste en 5 minutos de
aplicación de presión, seguidos por 5 minutos de liberación.
La invención se practica utilizando un rango de
presión negativa entre 1,01 y 100,3 kPa (0,01 a 0,99 atmósferas), y
más preferentemente se practica utilizando una presión negativa que
varía entre 50,7 y 81,1 kPa (0,5 a 0,8 atmósferas). El pedido de
tiempo para el uso del método sobre una herida es preferentemente de
al menos 12 horas, pero puede ser por ejemplo de 1 día, 2 días, 5
días, 7 días, 14 días, 30 días, o incluso más largo. No hay límite
superior, más allá del cual deje de ser beneficioso el uso de este
método; el método incrementa la velocidad de cicatrización hasta el
momento en que la herida se cierra realmente.
Las heridas abiertas están casi siempre
contaminadas con bacterias dañinas. Generalmente, una densidad
bacteriana de 10^{5} organismos bacterianos por gramo de tejido,
se considera como infección. (Generalmente se acepta que a este
nivel de infección, el tejido injertado no se adherirá a una
herida). Debe matarse estas bacterias, bien a través de la
respuesta inmune natural de la persona herida, o a través de algún
método externo, antes de que una herida se pueda cerrar. Hemos
observado que la aplicación de presión negativa a una herida
reducirá la densidad bacteriana de la herida; se cree que este
efecto se debe bien a la incompatibilidad de las bacterias con un
entorno de presión negativa, o a un flujo de sangre incrementado en
el área de la herida, puesto que la sangre de trae consigo células
y enzimas para destruir las bacterias.
La invención puede ser utilizada para reducir la
densidad bacteriana en una herida, al menos a la mitad. Más
preferentemente, puede utilizarse para reducir la densidad
bacteriana en al menos 1 000 veces. En el caso más preferente, el
método puede ser utilizado para reducir la densidad bacteriana en,
al menos, 1 000 000 veces. Los rangos de magnitud de la presión y
duración de la aplicación, son como se han descrito arriba, aunque
el ejemplo 3 de muestra una reducción drástica en la contaminación
de la herida después de una aplicación de presión negativa de 4
días. La presión puede ser aplicada de forma continua o cíclica, en
las proporciones de aplicación/no aplicación descritas arriba.
La presente invención puede también ser
utilizada para tratar una quemadura. Una quemadura de segundo grado,
una quemadura que tenga una capa superficial de tejido muerto y una
zona subyacente de estasis, a menudo está tan infectada que dentro
de 24-48 horas se transformará en una quemadura de
tercer grado, en la que están destruidas todas las estructuras
epidérmicas. Como se ha explicado arriba, la aplicación de una
presión negativa a la herida impide que la infección sea lo
suficientemente grave como para provocar la destrucción de
estructuras epidérmicas subyacentes. Como se ha indicado arriba la
magnitud, patrón, y duración de la aplicación de presión pueden
variar con la herida concreta.
La presente invención sirve además para mejorar
la unión de tejido vivo a una herida. La unión de tejido vivo a una
herida, es un procedimiento común que puede adoptar muchas formas.
Por ejemplo, una técnica común es el uso de un "colgajo", una
técnica en la que se separa en tres lados tejido de la piel,
procedente de un área adyacente a la herida, pero permanece unido
al cuarto, y a continuación es movido sobre la herida. Otra técnica
utilizada frecuentemente es un injerto de piel abierta, en el que se
separa piel por completo respecto de otra superficie de piel, y es
injertada sobre la herida. La aplicación de presión negativa al
complejo herida-injerto, reduce la densidad
bacteriana en el complejo y mejora el flujo de sangre a la herida,
mejorando de ese modo la unión del tejido injertado.
Los rangos aceptables de tiempo, magnitud, y
proporción de aplicación/no aplicación son los descritos arriba.
Cada una de estas variables se ve afectada por el tamaño y el tipo
de la herida.
\global\parskip0.960000\baselineskip
El aparato acorde con la presente invención para
facilitar la cicatrización de heridas, comprende medios de vacío
tales como una bomba para crear una presión negativa sobre el área
de piel que rodea la herida, y medios de sellado tales como una
lámina adhesiva asociada operativamente con el medio de vacío, para
mantener la presión negativa en la herida, mediante contactar con
la piel que rodea a la herida, y medios de tamizado tales como una
sección de espuma de células abiertas, localizada dentro del medio
de sellado, para impedir el sobrecrecimiento de tejido en el área
de la herida.
El medio de tamizado está situado
sustancialmente sobre la extensión de la herida, para impedir su
sobrecrecimiento. El tamaño y configuración del tamizado puede
ajustarse para cubrir la herida individual. Puede estar formado de
una variedad de materiales semi-rígidos porosos. El
material debe ser lo suficientemente poroso para permitir que el
oxígeno alcance la herida, y suficientemente rígido para impedir el
sobrecrecimiento de la herida. El medio de tamizado comprende una
espuma de polímero de células abiertas, que permiten la conexión
directa del medio de tamizado con el medio de vacío, a través de un
tubo flexible insertado en la espuma. Tal espuma puede variar en
grosor y rigidez, aunque se prefiere el uso de un material esponjoso
para el confort de los pacientes, si el paciente tiene que tumbarse
sobre el dispositivo durante su funcionamiento. También puede
perforarse para reducir su peso. Otra realización comprende una
sección de lámina de polietileno con estructura alveolar, cortada
con la forma de la herida.
Posibles medios de sellado incluyen un contorno
de sellado flexible en contacto con la piel que rodea la herida,
una lámina de polímero flexible superpuesta al medio de tamizado y
el medio de vacío, y unida a la piel a través de un adhesivo
aplicado a la superficie de la lámina opuesta a la piel, y un
dobladillo de sellado hinchable, que se conforma a la piel cuando
es hinchado, y que se mantiene en su posición mediante la succión
del medio de vacío. Si se utiliza una lámina adhesiva, esta debe
detener adhesión suficiente para permanecer en contacto con la piel
y formar un sellado bajo la presión negativa. Adicionalmente, debe
ser lo suficientemente flexible para recubrir el medio de tamizado
y seguir conformándose a la piel alrededor de la herida. El medio
de sellado puede incluir además una copa semi-rígida
que protege la herida del contacto externo. Por ejemplo, un
conjunto apropiado de copa-dobladillo se proporciona
en una máscara CPR de adultos, con un manguito hinchable.
Los medios de vacío adecuados incluyen cualquier
bomba de succión capaz de proporcionar al menos 689,5 Pa (0,1 psi)
de succión a la herida, y preferentemente una succión de hasta 20,7
kPa (3 psi), y en el caso más preferente una succión de hasta 96,5
kPa (14 psi), y un tubo flexible que va desde la bomba hasta un
punto dentro del volumen presurizado creado por el medio de
sellado. La bomba puede ser cualquier bomba de succión ordinaria
adecuada para fines médicos, que sea capaz de proporcionar la
succión necesaria. La dimensión de los tubos está limitada solo por
la capacidad de la bomba para proporcionar el nivel de succión
requerido para el funcionamiento. Se ha probado que es adecuado un
tubo de 6,4 milímetros (1/4 pulgadas) de diámetro. El medio de
vacío puede funcionar de forma sustancialmente continua, o puede
funcionar cíclicamente con periodos alternos de aplicación y no
aplicación de presión, a la herida.
Una realización preferida de la invención,
mostrada en la figura 1, comprende una sección sustancialmente
plana de la sección 10 de espuma de poliéster de células abiertas
(Fischer Scientific, Pittsburg, PA 15 219), lo suficientemente
larga para cubrir la herida e impedir así el sobrecrecimiento, un
tubo hueco flexible 11 (Fischer Scientific) insertado en la sección
10 de espuma de células abiertas, y unido a esta con un adhesivo y
que se extiende para unirse, en su extremo opuesto, a una bomba Cast
Vacuum (Fischer Scientific), y una lámina de adhesivo Loban 12
(Minnesota Mining and Manufacturing, St Paul, MN. 55 144) que
recubre la sección de espuma 10 y los tubos 11, y está adherida a
la piel que rodea la herida, formando así un sellado que permite la
creación de un vacío, cuando funciona la bomba de succión. Tal
aparato debería preferentemente estar envasado en condiciones
estériles, para mejorar el requisito de esterilización del aparato
previo a su uso (nótese que la lámina adhesiva 12 podría ser
empaquetada por separado respecto del conjunto de
espuma-tubo). Una ventaja concreta de esta
configuración, es su uso con escaras de decúbito: el dispositivo
puede ser situado profundamente en la herida, y el paciente puede
estar tumbado sobre esta sin afectar a la utilidad del dispositivo
ni dañar más la herida. Esto es crítico si el paciente no puede
moverse de esta postura, debido a otras razones médicas.
La presente invención se explica adicionalmente
a los siguientes ejemplos. Estos ejemplos se proporcionan con
propósitos solo ilustrativos, y no para ser tomados como
limitación.
Este ejemplo demuestra el uso de presión
negativa para incrementar la velocidad de cicatrización de defectos
de tercer grado, mediante incrementar la vascularidad y la cantidad
de tejido de granulación presente.
Se consiguió cerdos de quince kilogramos, y
fueron acondicionados durante 1 semana antes de ser utilizados. Las
espaldas de los cerdos fueron afeitadas y lavadas para cirugía. Se
creó dos defectos circulares de tercer grado en la línea media de
los animales, de 2,5 cm de diámetro y 1 cm de grosor. Se tomó
impresiones de alginato de cada defecto, para determinar su
volumen. Se administró Cefazolin (Kefzol) (500 mg) por vía
intramuscular (antibiótico). Los dispositivos de succión
utilizados, mostrados en la figura 2, comprenden una máscara CPR de
adultos 20 (Doug Brown and Associates, Huntington Beach, CA 92648)
que consta de una copa semi-rígida 21 y un
dobladillo hinchable 22 en contacto con la piel, una pantalla 24 de
poliéster de células abiertas que recubre la herida, y un tubo 23
flexible de 6,4 mm (1/4 pulgadas) de diámetro (Fischer Scientific),
conectado mediante un conector de tubos Nalgene a una bomba de
vacío (Fischer Scientific), y que se extiende a través de un
agujero sellado en la copa. Cada dispositivo se configuró de forma
que el tubo de succión iba desde la copa sobre el animal, hacia
arriba a través de una polea suspendida sobre el centro del corral,
y hacia abajo hasta una botella trampa de vacío, para recoger el
líquido exudado, y después hacia abajo hasta la bomba de vacío. Se
fijo un dispositivo de succión sobre cada defecto, y se aplicó
succión de 13,8 a 41,4 kPa (2-6 psi), a uno de los
dispositivos. Los dispositivos se retiraron solo cuando pudo
realizarse impresiones de cada defecto. Este procedimiento se
continuó hasta que el volumen de ambos defectos fue cero.
La tabla 1 muestra datos expresados como la
cantidad de tejido de granulación formado por día, y como la
diferencia porcentual en la velocidad de formación de tejido de
granulación. Los datos muestran que en todos los casos el uso de
presión negativa incrementó la velocidad de cicatrización de la
herida, y la formación de tejido de granulación en una proporción
estadísticamente significativa.
Este ejemplo se diseñó al efecto de mostrar el
uso de succión cerrada continua, para el tratamiento de quemaduras
térmicas de grosor parcial (quemaduras de segundo grado),
profundas.
Se afeitó las espaldas de cerdos de 15 kg, y
fueron lavadas para cirugía. Se calentó una varilla de cobre de 38
mm (1,5 pulgadas) de diámetro a 190ºC, en un baño de aceite. La
varilla fue presionada sobre la espalda del cerrado durante 15
segundos, siguiendo una técnica bien conocida para relacionar la
profundidad de la quemadura con el tiempo y la temperatura. Se creó
tres quemaduras sobre la columna de cada cerdo, separadas en
intervalos de 5 cm. Se situó copas del aparato de succión de la
configuración descrita arriba, sobre dos de las quemaduras, con
crema de sulfadiazina de plata (Silvadine), la crema antibiótica
estándar aplicada a quemaduras humanas antes de la extirpación de
tejido quemado, aplicada a la tercera. Se administró Cefazolin
(Kefzol) (500 mg) intramuscular (antibiótico). Se aplicó succión de
13,8 hasta 41,4 kPa (2-6 psi) a una de las copas.
Se tomó una pequeña biopsia con sacabocados (2 mm), del área herida,
y se examinó histológicamente para determinar la profundidad de la
quemadura.
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Las biopsias fueron analizadas por un
dermopatólogo a quien no se dijo la naturaleza del estudio. Este
concluyó que los especímenes con tejido succionado estaban más
saludables y cicatrizaban más rápidamente que los especímenes no
succionados.
Este ejemplo ilustra los efectos de succión
cerrada continua, en la densidad bacteriana del tejido
infectado.
Se afeitó y preparó para cirugía cerdos de
quince kilogramos. Se creó dos defectos de 2,5 cm de diámetro en el
dorso de cada cerdo, utilizando técnicas estériles, manteniendo un
intervalo de 7,5 cm entre los bordes de los defectos. Se obtuvo
hemostasis por cauterización eléctrica. Se inyectó un ml de caldo de
cultivo conteniendo 10^{8} de organismos Staph. aureus,
inmediatamente por debajo del tejido superficial en el centro de
cada herida. Se situó copas de succión de la configuración descrita
arriba, sobre cada defecto, y se colocó una camiseta sobre el
animal. Se aplicó succión desde 13,8 hasta 41,4 kPa
(2-6 psi) 24 horas después de la cirugía, a solo
uno de los defectos, dejando que cada animal actúe bajo su propio
control. No se proporcionó antibióticos durante el curso del
estudio.
Cada día se retiró una pequeña pieza (biopsia
con sacabocados de 3 mm) de tejido de granulación, desde el centro
de cada defecto. Se determinó el número de organismos presentes en
el tejido, pesando el tejido, homogeneizando el tejido, diluyendo
en serie el sobrenadante, y pasando a placas el sobrenadante
diluido, sobre placas agar sangre. Se trató muestras del caldo
original de forma idéntica, para determinar efectos de las
manipulaciones mecánicas sobre la viabilidad bacteriana. El
procedimiento se llevó a cabo hasta que cicatrizaron las
heridas.
La tabla 2 compara la densidad bacteriana de
heridas tratadas, y controladas heridas en el tiempo. Los datos se
expresan como el registro medio del número de organismos viables por
gramo de tejido, en función del tiempo. Claramente, la aplicación
de presión negativa incrementa la velocidad a la que se destruye las
bacterias. Utilizando 10^{5} organismos por gramo de tejido como
línea de base para la infección, los datos mostraron que en
promedio una herida succionada fue desinfectada después de cuatro
numéricos días de tratamiento, mientras que la herida promedio no
tratada seguía infectada después de 7 días.
Mr. L. J. Es un hombre diabético de 45 años de
edad, que ha sido parapléjico como resultado de un disparo, durante
12 años. Tiene un historial recurrente de escaras de decúbito en la
fosa derecha del isquion y úlcera de decúbito trocantérica derecha.
L. J. fue ingresado en el hospital para el tratamiento y cierre de
las escaras de decúbito. Se situó un colgajo sobre la herida, y
este fue asegurado con suturas y grapas.
\newpage
Las incisiones del colgajo se abrieron, teniendo
como resultado una herida grande, abierta. Los tejidos del colgajo
estaban muy edematosos y endurecidos. Nueve días después de que se
separará el colgajo, se situó un dispositivo de presión negativa
sobre la herida. El dispositivo consistía en una sección de espuma
de poliéster de células abiertas (Fischer Scientific) de
aproximadamente 12,7 mm (1/2 pulgadas) de grosor, unido a una bomba
de succión mediante un tubo flexible (Fischer Scientific), y
cubierto y sellado por lámina de polímero Loban (Minnesota Mining
and Manufacturing, St. Paul, MN 55144). Se aplicó un vacío continuo
de 34,5 kPa (5 psi) a la herida. El diseño del dispositivo permitió
que el paciente estuviera tumbado confortablemente sobre el
dispositivo, durante su funcionamiento.
La profundidad de la herida disminuyó de forma
espectacular. Los dispositivos fueron cambiados y la herida
examinada, con una frecuencia de tres veces por semana. Se continuó
tratamiento a presión reducida durante 6 semanas, momento en el que
la herida había cicatrizado.
Mr. W. E. es un hombre de 51 años de edad, que
tenía ambas piernas amputadas por la cadera desde hace
aproximadamente 20 años. Estaba aquejado de una gran escara de
decúbito en la región de las nalgas. La escara de decúbito había
estado presente durante 7 meses y medía 200 mm (8 pulgadas)
lateralmente, y 76 mm (3 pulgadas) en su parte más ancha. Se colocó
un dispositivo de presión reducida con espuma de células abiertas
como el descrito en el ejemplo 4, sobre la herida, y se aplicó una
presión negativa de 34,5 kPa (5 psi), cíclicamente en periodos
alternos de 5 minutos activada, 5 minutos desactivada. El
dispositivo de espuma de células abiertas se utilizó cuando el
paciente estaba tumbado sobre el dispositivo. Se cambió el
dispositivo según un programa de tres veces por semana.
Después de 5 semanas de tratamiento, la herida
medía 76 mm (3 pulgadas) lateralmente, y 38 mm (1,5 pulgadas) en su
parte más ancha. En ese momento la herida era esencialmente tejido
de granulación sano, que aceptó un transplante alogénico de
queratinocito cultivado, y cicatrizó por completo.
Mr. C. L. es un hombre de 50 años de edad, que
padeció una revisión de colostomía a través de una laparotomía en
línea media. Fuere reingresado en el hospital para la dehiscencia de
la herida y la evisceración seguida de tos fuerte. La pared
abdominal fue cerrada con cubierta de malla Prolene. Seis semanas
después de la colocación de la malla Prolene, la herida seguía
abierta y medía de 28 cm x 23 cm, con tejido de granulación disperso
creciendo a través de la malla Prolene. Se colocó un dispositivo
grande de copa de presión reducida, del tipo descrito en el ejemplo
1, con una lámina subyacente de Aquaplast poroso (WFR/Aquaplast
Corp., Wyckoff, NJ 07481) sobre la superficie de la malla
Proleno/herida, y el espacio se cerró con una cámara de Loban. Se
aplicó presión negativa continua de 34,5 kPa (5 psi). El
dispositivo se cambió tres veces por semana.
Después de 6 días, había crecido tejido de
granulación a través de la malla Prolene, cubriendo por completo la
malla. Se llevó al paciente a la sala de operaciones, donde fue
socavado el tejido circundante, e injertado sobre la herida
parcialmente próximo al defecto. Se utilizó injertos de piel de
grosor dividido, para cubrir el resto del defecto, y fueron
situados en el lecho del tejido de granulación. La herida aceptó el
80% de los injertos, y las restantes áreas cicatrizaron solo con
cambios de vendaje.
Mr. R. F. es un hombre blanco de 39 años de edad
que tuvo trauma severo en su extremidad inferior izquierda, tras un
accidente en un vehículo de motor, hace 10 años. Contrajo
osteomielitis crónica y una úlcera abierta con hueso expuesto de su
tobillo izquierdo lateral (úlcera maleolar lateral). Se retiró del
tobillo, por métodos quirúrgicos, hueso y tejido blando necrótico.
Se sometió al paciente a un proceso de antibióticos de
2-1/2 semanas. El día después de la cirugía, se
situó un dispositivo de presión reducida del tipo descrito en el
ejemplo 1, sobre la herida, y se aplicó una presión negativa de 34,5
kPa (5 psi). El dispositivo se cambió en un programa de tres veces
por semana. Después de 14 días de tratamiento, la herida era menor y
estaba rellena con tejido de granulación. Se colocó un injerto de
piel de grosor dividido, sobre el centro del defecto, y cicatrizó
en su mayor parte.
El paciente B es ingresado con quemaduras de
segundo y tercer grado, sobre la cara y extremidades superiores
incluyendo ambas manos, como resultado de un incendio. Se colocó un
dispositivo grande de presión reducida con forma de mitón, del tipo
descrito en el ejemplo 4, sobre la mano derecha del paciente, con
insertos de espuma de células abiertas situado sobre los dedos,
para aplicar presión reducida a los espacios interdigitales. Se
aplicó cíclicamente un vacío de 20,7 kPa (3 psi), en un esquema de 5
minutos activado, 5 minutos desactivado. El dispositivo se cambió
en un programa de tres veces por semana. El tratamiento se prolongó
hasta que el tejido necrótico fue mudado o suprimido, seguido de la
colocación de injerto de piel de grosor partido.
Los ejemplos anteriores son ilustrativos de la
presente invención, y no deben interpretarse como limitativos de
esta. La invención se define mediante las reivindicaciones
siguientes, y sus equivalentes han de considerarse incluidos en
estas.
Claims (21)
1. Un aparato para facilitar la cicatrización
de una herida, que comprende medios de vacío (11, 23) para crear
una presión negativa en el área de la piel, incluyendo y rodeando la
herida, y medios de sellado (12, 20) asociados operativamente con
los mencionados medios de vacío, para mantener la mencionada presión
negativa sobre la mencionada herida, mediante contactar la piel que
rodea la mencionada herida, caracterizado porque la
mencionada presión negativa está entre aproximadamente 1,01 y 100,3
kPa (0,01 y 0,99 atmósferas), y porque el mencionado aparato
comprende medios de pantalla (10, 24) para ser posicionados en la
herida dentro de los medios de sellado, al efecto de impedir el
sobrecrecimiento de tejido en la herida, en el que los mencionados
medios de pantalla (10, 24) comprenden una espuma de polímero de
células abiertas.
2. Un aparato acorde con la reivindicación 1,
en el que los mencionados medios de pantalla (10, 24) comprenden un
elemento semi-rígido poroso, plano.
3. Un aparato acorde con la reivindicación 1 o
la 2, en el que los mencionados medios de sellado (12, 20) incluyen
un contorno de sellado flexible, en contacto con la mencionada piel
que rodea la mencionada herida.
4. Un aparato acorde con la reivindicación 1,
en el que el mencionado medio de sellado (12) incluye una lámina de
polímero flexible que recubre el mencionado medio de pantalla,
teniendo la mencionada lámina de polímero adhesiva en al menos una
superficie opuesta a la herida, para unir y sellar la mencionada
lámina de polímero a la mencionada piel circundante.
5. Un aparato acorde con la reivindicación 1 o
la 2, en el que el mencionado medio de sellado (20) incluye una
copa semi-rígida (21), configurada para proteger la
mencionada herida respecto del contacto externo.
6. Un aparato acorde con la reivindicación 5,
en el que el mencionado medio de sellado (20) incluye un dobladillo
de sellado (22) en contacto con la mencionada piel que rodea la
herida.
7. Un aparato acorde con la reivindicación 6,
en el que el mencionado dobladillo de sellado (22) es hinchable.
8. Un aparato acorde con la reivindicación 1,
en el que la sección de espuma de células abiertas (10) está
configurada para recubrir la herida, y en el que el mencionado medio
de sellado (12) incluye una cubierta flexible impermeable al
fluido, que recubre la mencionada sección de espuma, adaptada la
mencionada cubierta para formar un cierre con la piel que rodea la
herida, al efecto de mantener la presión negativa por debajo de la
mencionada cubierta, y en el que el mencionado medio de vacío (11)
incluye un solo elemento tubular, que tiene un primer extremo
insertado por debajo de al menos una parte de la sección de espuma
(10), y tiene un segundo extremo que se extiende desde la
mencionada cubierta, hasta una localización externa a la mencionada
cubierta, para suministrar presión negativa por debajo de la
cubierta.
9. Un aparato acorde con la reivindicación 8,
en el que el mencionado primer extremo del elemento tubular (11)
está insertado dentro de la sección de espuma (10).
10. Un aparato acorde con la reivindicación 1,
en el que el mencionado medio de sellado (20) incluye:
- a)
- una copa semi-rígida impermeable al fluido (21), para posicionarse sobre la herida y mantener una presión negativa sobre la mencionada herida, teniendo la mencionada copa (21) solo un puerto externo de comunicación de fluido; y
- b)
- medios de sellado para sellar la mencionada copa alrededor de la herida, incluyendo los mencionados medios de sellado un dobladillo (22), para ser inflado y conformarse a la piel circundante, al efecto de sellar la mencionada copa (21) en su posición, mediante la mencionada presión negativa;
y donde el mencionado medio de
vacío (23), está conectado con el mencionado puerto de comunicación
de fluido de la mencionada copa (21), para suministrar la
mencionada presión
negativa.
11. Un aparato acorde con la reivindicación 10,
que comprende medios de pantalla para su posicionamiento por debajo
de la copa en la herida, al efecto de impedir el sobrecrecimiento de
la herida.
12. Un aparato acorde con cualquier
reivindicación precedente, en el que el mencionado medio de vacío
(11, 23) incluye medios de bombeo capaces de proporcionar una
succión de al menos 689,5 Pa (0,1 psi).
13. Un aparato acorde con cualquiera de las
reivindicaciones 1 a 11, en el que los mencionados medios de vacío
(11, 23) incluyen medios de bombeo capaces de proporcionar una
succión de al menos 20,7 kPa (3 psi).
14. Un aparato acorde con cualquiera de las
reivindicaciones 1 a 11, en el que los mencionados medios de vacío
(11, 23) incluyen medios de bombeo capaces de proporcionar una
succión de al menos 96,5 kPa (14 psi).
15. Un aparato acorde con cualquier
reivindicación precedente, en el que los mencionados medios de vacío
(11, 23) funcionan continuamente.
16. Un aparato acorde con cualquiera de las
reivindicaciones 1 a 14, en el que los mencionados medios de vacío
(11, 23) funcionan cíclicamente, para proporcionar períodos de
aplicación y períodos de no aplicación, de succión.
17. Un aparato acorde con la reivindicación 1,
en el que los mencionados medios de pantalla (10) incluyen una
sección de espuma de polímero de células abiertas, configurada para
recubrir la herida; y donde los medios de vacío (11) incluyen un
tubo flexible que tiene un extremo de entrada y un extremo de
salida, estando el mencionado extremo de entrada insertado en la
mencionada sección (10) de espuma de polímero de células
abiertas.
18. Un aparato acorde con la reivindicación 17,
que está en un envase aséptico.
19. El aparato acorde con la reivindicación 16,
en el que el mencionado medio de vacío (11, 23) funciona
cíclicamente para proporcionar períodos de aplicación y no
aplicación, de succión, con la proporción de la duración del
período de aplicación frente al período de no aplicación, entre
aproximadamente 1:10 y 10:1.
20. Un aparato acorde con cualquier
reivindicación precedente, en el que los mencionados medios de vacío
(11, 23) proporcionan a la herida una presión negativa, entre
aproximadamente 50,7 y 100,3 kPa (0,5 y 0,99 atmósferas).
21. Un aparato acorde con cualquier
reivindicación precedente, en el que los mencionados medios de vacío
(11, 23) suministran a la herida una presión negativa, entre
aproximadamente 50,7 y 81,1 kPa (0,5 y 0,8 atmósferas).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US792001 | 1991-11-14 | ||
| US07/792,001 US5645081A (en) | 1991-11-14 | 1991-11-14 | Method of treating tissue damage and apparatus for same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2114956T3 ES2114956T3 (es) | 1998-06-16 |
| ES2114956T5 true ES2114956T5 (es) | 2007-06-16 |
Family
ID=25155498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES92925128T Expired - Lifetime ES2114956T5 (es) | 1991-11-14 | 1992-11-12 | Aparato para tratar tejido dañado. |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5645081A (es) |
| EP (1) | EP0620720B2 (es) |
| JP (1) | JP3766934B2 (es) |
| KR (1) | KR100274726B1 (es) |
| AT (1) | ATE164055T1 (es) |
| AU (1) | AU674837B2 (es) |
| CA (1) | CA2121688C (es) |
| DE (2) | DE9219136U1 (es) |
| DK (1) | DK0620720T4 (es) |
| ES (1) | ES2114956T5 (es) |
| WO (1) | WO1993009727A1 (es) |
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Also Published As
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|---|---|
| DE69224847T2 (de) | 1998-08-20 |
| JPH07501958A (ja) | 1995-03-02 |
| US5645081A (en) | 1997-07-08 |
| DE9219136U1 (de) | 1998-06-18 |
| DK0620720T3 (da) | 1998-09-28 |
| CA2121688A1 (en) | 1993-05-27 |
| EP0620720B1 (en) | 1998-03-18 |
| DE69224847D1 (de) | 1998-04-23 |
| WO1993009727A1 (en) | 1993-05-27 |
| AU674837B2 (en) | 1997-01-16 |
| EP0620720A1 (en) | 1994-10-26 |
| CA2121688C (en) | 2001-07-31 |
| KR100274726B1 (ko) | 2001-03-02 |
| EP0620720B2 (en) | 2006-11-02 |
| JP3766934B2 (ja) | 2006-04-19 |
| ATE164055T1 (de) | 1998-04-15 |
| ES2114956T3 (es) | 1998-06-16 |
| DE69224847T3 (de) | 2007-04-19 |
| DK0620720T4 (da) | 2007-03-12 |
| EP0620720A4 (en) | 1995-02-15 |
| AU3130393A (en) | 1993-06-15 |
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