ES2566341T3 - Plantilla de corte de cerámica - Google Patents

Plantilla de corte de cerámica Download PDF

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ES2566341T3
ES2566341T3 ES11771066.5T ES11771066T ES2566341T3 ES 2566341 T3 ES2566341 T3 ES 2566341T3 ES 11771066 T ES11771066 T ES 11771066T ES 2566341 T3 ES2566341 T3 ES 2566341T3
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weight
din
al2o3
cutting template
ceramic
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Matthias Eschle
Roman Preuss
Heinrich Wecker
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Ceramtec GmbH
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Ceramtec GmbH
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/14—Surgical saws ; Accessories therefor
    • A61B17/15—Guides therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/17—Guides or aligning means for drills, mills, pins or wires
    • A61B17/1739—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
    • A61B17/1764—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the knee
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Abstract

Plantilla de corte de cerámica, caracterizada por que está constituida de un cuerpo de base 2, con una o varias escotaduras 3 para el paso y la guía con ajuste preciso de un instrumento de corte, en la que la cerámica contiene de 3 a 8 % en peso de Y2O3, con preferencia de 4 a 6 % en peso de Y2O3, de manera especialmente preferida de 4,5 a 5,5 % en peso de Y2O3, de 0 a 0,5 % en peso de Al2O3, con preferencia de 0,05 a 0,4 % en peso de Al2O3, de manera especialmente preferida de 0,1 a 0,3 % en peso de Al2O3 y el resto hasta 100 % en peso de ZrO2 y en la que puede estar contenido hasta 3 % en peso de HfO2, con preferencia hasta 2 % en peso de HfO2 en el óxido de zirconio y la proporción monoclínica en el ZrO2 es con preferencia inferior a 2 % en vol., de manera preferida inferior a 1 % en vol.

Description

imagen1
Las propiedades de las cerámicas-Y-TZP presentan una resistencia de 900 a 1600 MPa, con preferencia de 1000 a 1500 MPa. El tamaño de los granos de la cerámica se mueve en este caso en un intervalo de < 0,5 m, con preferencia en el intervalo de 0,1 a 0,3 m.
Las configuraciones preferidas se indican en la Tabla siguiente:
Ejemplo 1
Ejemplo 2
Valor
Valor
Unidad
Óxido de itrio (Y2O3)
4,9 5,2 % en peso
Óxido de afnio (HfO2)
2,0 2,0 % en peso
Óxido de aluminio (Al2O3)
0,1 0,1 % en peso
Impurezas
< 0,1 < 0,1 % en peso
Óxido de zirconio (ZrO2)
Resto hasta 100 Resto hasta 100 % en peso
Las propiedades de las cerámicas empleadas con preferencia se indican en las Tablas siguientes:
Ejemplo 1:
Tamaño del grano
0,15 – 0,2 m
Color
Marfil
Densidad
6,08 g/cm3 DIN EN 623-2
Capacidad de absorción de agua
0 % ASTM C 373
Resistencia (flexión en 4 puntos)
1400 MPa DIN ENV 843-1
Módulo de Weibuli
10 DIN ENV 843-5
Tenacidad hasta rotura
7,5 MPam ISO 23 146
Dureza Vickers (HV 0,5)
13 GPa DIN ENV 843-4
Módulo-E
210 GPa DIN ENV 843-2
Índice de Poisson
0,3 DIN ENV 843-2
Coeficiente de dilatación térmica
DIN EN 821-1
20 – 200 ºC
10,4 10-6 K-1
20 – 1000 ºC
11,4 10-6 K-1
Capacidad térmica específica (20 ºC)
0,4 kJ / kg K DIN EN 821-3
Conductividad térmica (20 ºC)
2,5 W / m K DIN EN 821-2
3
Ejemplo 2:
Tamaño del grano
< 0,5 m
Color
Blanco
Densidad
6,05 g/cm3 DIN EN 623-2
Capacidad de absorción de agua
0 % ASTM C 373
Permeabilidad al gas
0 %
Resistencia (flexión en 4 puntos)
1050 MPa DIN ENV 843-1
Resistencia a la presión
2200 MPa DIN 51067 T1
Módulo de Weibuli
>10 DIN ENV 843-5
Dureza Vickers (HV 1)
1250 DIN ENV 843-4
Módulo-E (dinámico)
210 GPa DIN ENV 843-2
Índice de Poisson
0,3 DIN ENV 843-2
Coeficiente de dilatación térmica
DIN EN 821-1
20 – 200 ºC
11,1 10-6 K-1
20 – 1000 ºC
11,7 10-6 K-1
Capacidad térmica específica (20 ºC)
0,4 kJ / kg K DIN EN 821-3
Conductividad térmica (20 ºC)
2,5 W / m K DIN EN 821-2
Parámetro de tensión térmica
321 K
Constante de dielectricidad
29 (1 MHz) IEC 672-1
Factor de pérdida dieléctrica
0,002 (1 GHz) IEC 672-1
En las plantillas de corte o bien bloques de sierra fabricados de acuerdo con la invención a partir de cerámicas-Y5 TZP se reduce la abrasión metálica hasta el 90 % frente a las plantillas de corte o bien los bloques de sierra de metal. El tiempo de actividad de las plantillas de corte de acuerdo con la invención o bien de los bloques de sierra de acuerdo con la invención en el inserto se prolonga claramente, puesto que se producen sólo poco desgaste de las plantillas de corte. Esto reduce los costes. Además, se reduce el riesgo de alergias o bien las reacciones alérgicas de pacientes así como el riesgo de infecciones.
10 Con preferencia, las plantillas de corte de acuerdo con la invención se emplean en la técnica médica, en particular en operaciones para el tratamiento de un hueso, de manera preferida en implantes de rodilla-TEP.
Las ventajas de la plantilla de corte de cerámica de acuerdo con la invención o bien las de la cerámica, a partir de la cual está fabricada son:
• la plantilla de corte presenta una abrasión extremadamente reducida,
15 • el material es biocompatible,
• cuando la plantilla de corte de acuerdo con la invención está rotulada con un láser, ésta es muy bien visible y legible y puede reducir de esta manera las manipulaciones erróneas durante el empleo de la plantilla,
4
imagen2
imagen3

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  1. imagen1
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US20130204261A1 (en) 2013-08-08
DE102011084106A1 (de) 2012-04-19
JP2013540012A (ja) 2013-10-31
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CN103260529A (zh) 2013-08-21
WO2012045826A1 (de) 2012-04-12

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