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1. EP1339447 - CATHETER SHAFT HAVING VARIABLE THICKNESS LAYERS AND METHOD OF MAKING

Office European Patent Office
Application Number 01992594
Application Date 29.10.2001
Publication Number 1339447
Publication Date 03.09.2003
Publication Kind A2
IPC
B29C 47/04
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
47Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
04of multilayered or multicoloured articles
A61M 25/00
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
25Catheters; Hollow probes
A61M 25/00
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
25Catheters; Hollow probes
B29C 47/06
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
47Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
04of multilayered or multicoloured articles
06Multilayered articles
A61M 25/16
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
25Catheters; Hollow probes
16Making or assembling not otherwise provided for
CPC
A61M 25/0009
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
25Catheters; Hollow probes
0009Making of catheters or other medical or surgical tubes
A61M 25/0045
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
25Catheters; Hollow probes
0043characterised by structural features
0045multi-layered, e.g. coated
Applicants ADVANCED CARDIOVASCULAR SYSTEM
Inventors CARTER MARK
Designated States
Priority Data 0145363 29.10.2001 US
09707681 06.11.2000 US
Title
(DE) KATHETERSCHAFT MIT SCHICHTEN UNTERSCHIEDLICHER DICKE UND VERFAHREN ZU SEINER HERSTELLUNG
(EN) CATHETER SHAFT HAVING VARIABLE THICKNESS LAYERS AND METHOD OF MAKING
(FR) TIGE DE CATHETER COMPRENANT DES COUCHES D'EPAISSEURS VARIABLES ET PROCEDE DE FABRICATION
Abstract
(EN)
A catheter having a shaft with at least two variable layers, in which the relative proportions of the two layers changes along at least a part of the multilayered shaft section. The catheter shaft includes a cotapered transition section having a first layer tapering to a decreased thickness, and a second layer inversely tapering to an increased thickness. In one embodiment, the shaft has one or more tapered outer and/or inner surfaces in addition to the cotapered transition. The tapered outer or inner surface of the shaft is typically longitudinally displaced from the cotapered transition section, and the shaft having a cotapered transition section is coextruded. The shaft of the invention provides improved transitions between shaft sections, to thereby change characteristics such as the shaft stiffness along the length of the catheter.

(FR)
L'invention concerne un cathéter muni d'une tige présentant au moins deux couches, dans lequel les proportions relatives des deux couches changent le long d'au moins une partie du segment de la tige multicouche. La tige du cathéter comprend un segment de transition pourvu d'une première couche se rétrécissant jusqu'à atteindre une épaisseur réduite et d'une seconde couche se rétrécissant inversement jusqu'à atteindre une épaisseur accrue. Dans un mode de réalisation, la tige comprend une ou plusieurs surfaces coniques extérieures et/ou intérieures, outre la transition conique complémentaire. La surface conique extérieure ou intérieure de la tige se déplace généralement dans le sens longitudinal en partant du segment de transition conique complémentaire. Dans un mode de réalisation préféré, la tige comprenant un segment de transition conique complémentaire est coextrudée. Un autre aspect de l'invention concerne une méthode de fabrication d'une tige pourvue d'un segment de transition conique complémentaire. La tige selon l'invention permet d'améliorer les transitions entre les segments de la tige, afin de modifier des caractéristiques telles que la rigidité de la tige sur la longueur du cathéter.