Triggered release drug delivery system

A - Human Necessities – 61 – M

Patent

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Details

A61M 31/00 (2006.01) A61B 17/06 (2006.01) A61B 19/02 (2006.01) A61M 5/32 (2006.01) A61M 25/00 (2006.01) A61M 29/00 (2006.01) A61M 29/02 (2006.01)

Patent

CA 2223586

This invention features a method for triggering release of a drug from a hydrogel polymer (55) to tissue at a desired location of the body using a catheter. A portion of the catheter (51) is coated on its outer surface with a polymer (55) having the capacity to incorporate a predetermined substantial amount of drug which is immobilized in the polymer until released by a triggering agent or condition that is different from physiological conditions. Upon contact with a triggering agent or condition, the polymer reacts, e.g., swells or contracts such that the drug is delivered to the desired body tissue. A balloon catheter (51) is shown in which the hydrogel (55) is carried on the exterior surface of the balloon (54).

La présente invention décrit un procédé pour déclencher l'administration d'un médicament à l'aide d'un cathéter à partir d'un polymère hydrogel (55) vers un tissu à l'endroit souhaité du corps. Une partie du cathéter (51) est revêtue extérieurement d'un polymère (55) pouvant contenir une quantité prédéterminée et conséquente de médicament immobilisé dans le polymère jusqu'à ce que ce médicament soit libéré par un agent déclencheur ou par une pathologie qui diffère des conditions physiologiques. Lorsque le polymère entre en contact avec l'agent déclencheur ou la pathologie, ledit polymère réagit, à savoir, il gonfle ou se contracte de telle sorte que le médicament soit diffusé vers le tissu souhaité du corps. La présente invention décrit un cathéter (51) de type ballon, pour lequel l'hydrogel est placé à l'extérieur du ballon (54).

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