Expandable seal for use with medical device and system

Details Expandable seal for use with medical device and system Expandable seal for use with medical device and system

A - Human Necessities

61

N

A61N 1/05 (2006.01)

Patent

CA 2339864

A seal adapted for use with medical devices is provided with a lead having a distal tip electrode. The distal tip of the lead is adapted for implantation on or about the heart and for connection to a system for monitoring or stimulating cardiac activity. The lead can include a fixation helix for securing the electrode to cardiac tissue. The lead assembly can alternatively include an open lumen lead tip. A seal is provided within the lead tip assembly such that the seal is expanded to prevent or limit further entry of fluids through the lead tip. The seal includes an expandable matrix, such as a hydrogel. The seal is formed on or within the lead when the lead and the seal come into contact with a fluid and expands. The seal is also formed as a plug which is deployed through the medical device, and expands as the plug absorbs fluid. A housing incorporating the seal can also be attached to a portion of the medical device to provide the seal.

On décrit un joint d'étanchéité adapté pour équiper des instruments médicaux, qui comprend un fil muni d'une électrode d'embout distal. L'embout distal est adapté pour s'implanter sur ou autour du coeur et se raccorder à un système destiné à surveiller ou stimuler l'activité cardiaque. Le fil peut inclure une hélice de fixation pour fixer l'électrode au tissu cardiaque. L'ensemble fil peut autrement comprendre un embout de fil à lumière ouverte. Un joint d'étanchéité est disposé à l'intérieur de l'ensemble embout de fil si bien que le joint est expansé pour empêcher ou limiter la pénétration de liquides à travers l'embout du fil. Le joint comprend une matrice expansible, telle qu'un hydrogel. Le joint est formé sur ou à l'intérieur du fil lorsque le joint et le fil viennent au contact d'un fluide et s'expansent. Le joint est également formé comme un bouchon déployé à travers l'instrument médical, et s'expanse à mesure que le bouchon absorbe le fluide. Une enveloppe incorporant le joint peut également se fixer à une partie de l'instrument médical pour servir de joint d'étanchéité.

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