Medical devices and methods for their fabrication and use

Details Medical devices and methods for their fabrication and use Medical devices and methods for their fabrication and use

A - Human Necessities

61

M

A61M 25/00 (2006.01)

Patent

CA 2630215

An elongate device for introduction into a body lumen comprises a body extending in a longitudinal direction (L), and having at least two skeletal members (21, 21a, 21b, 24, 27a, 27b), which are substantially aligned in the longitudinal direction (L), and at least one electroactive polymer material (22), which changes volume upon electrical activation, arranged to control a distance between two longitudinally spaced-apart portions of aid skeletal members (21, 21a, 21b, 24, 27a, 27b). The body presents an asymmetric bending stiffness, and/or the electroactive polymer material is asymmetrically arranged about a central axis of the device, such that the body is arranged to bend transversely of the longitudinal direction (L) upon activation of the electroactive polymer material. The electroactive polymer material (22) is form fit onto at least one of the skeletal members (21, 21a, 21b). There is further provided an elongate device for introduction into a body lumen, the elongate device having a controllable stiffness portion. Methods for fabricating and using the elongate devices are also provided.

L~invention a pour objet un dispositif allongé pour introduction dans une lumière corporelle, comprenant un corps s~étendant dans le sens longitudinal (L), au moins deux éléments structuraux (21, 21a, 21b, 24, 27a, 27b) sensiblement alignés dans le sens longitudinal (L) et au moins un matériau polymère électroactif (22) dont le volume varie selon une activation électrique, conçu pour contrôler une distance entre deux parties écartées longitudinalement l~une de l~autre desdits éléments structuraux (21, 21a, 21b, 24, 27a, 27b). Le corps présente une rigidité à la flexion asymétrique et/ou le matériau polymère électroactif est disposé asymétriquement autour d~un axe central du dispositif, de sorte que le corps est fléchi dans le sens transversal au sens longitudinal (L) selon l~activation du matériau polymère électroactif. La forme du matériau polymère électroactif (22) est adaptée à au moins l~un des éléments structuraux (21, 21a, 21b). L~invention a également pour objet un dispositif allongé pour introduction dans une lumière corporelle comportant une partie à rigidité réglable. Enfin, l~invention concerne aussi des procédés de fabrication et d~utilisation des dispositifs allongés.

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