Medical electrical lead with surface treatment for enhanced...

A - Human Necessities – 61 – N

Patent

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A61N 1/05 (2006.01)

Patent

CA 2198075

A medical electrical lead having a fixation helix which is surface treated along at least a portion further has a bioabsorbable coating in order to permit the helix to be inserted into the heart tissue without causing damage to the heart tissue through the engagement of the surface treated portion with heart tissue during insertion. In the perferred embodiment the bioabsorbable material is mannitol, although other bioabsorbable materials may also be used, such as a material which is no more than sparingly soluble in water, for example, the steroid beclomethasone dipropionateanhydrous. Through such a construction the helix may be inserted into tissue while the coating of absorbable materials provides a smooth surface between the surface treated portion of the helix and the tissue. Once inserted, the coating is absorbed and the surface treated portion provides electrical contact with the heart tissue.

Un conducteur électrique d'usage médical possédant une spirale de fixation dont au moins une partie de la surface est traitée et qui possède en outre un revêtement bioabsorbable pour permettre à la spirale d'être insérée dans le tissu cardiaque sans causer de lésions au tissu cardiaque par l'engagement de la partie de la surface traitée avec le tissu cardiaque durant l'insertion. Dans une version préférée, la matière bioabsorbable est le mannitol, bien que d'autres matières bioabsorbables puissent également être utilisées, comme une matière qui n'est que très légèrement soluble dans l'eau, par exemple, le stéroïde dipropionate de béclométhasone anhydre. Grâce à cette construction, la spirale peut être insérée dans le tissu pendant que le revêtement de matières absorbables fournit une surface lisse entre la partie de la spirale traitée en surface et le tissu. Une fois la spirale insérée, le revêtement est absorbé et la partie traitée en surface assure un contact électrique avec le tissu cardiaque.

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