Soft x-ray emitting medical devices

A - Human Necessities – 61 – K

Patent

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Details

A61K 51/12 (2006.01) A61K 41/00 (2006.01) G21G 4/08 (2006.01) A61F 2/00 (2006.01) A61F 2/06 (2006.01) A61N 5/10 (2006.01)

Patent

CA 2319029

An implantable medical device according to the present invention comprises a body, such as a stent or a wire, and an isotope having a high neutron activation cross section, such as 168Yb or 124Xe, ion-implanted onto the surface of the body. The use of isotopes having high neutron activation cross sections allows a wider choice of substrates to be employed, including stainless steel, nickel, titanium, and alloys including these metals, because the time required for neutron activation of the device is reduced. A coating of high-density material may be incorporated to serve several useful purposes, including containment of undesirable beta particles from long-lived radioactive species, creation of a biologically inert surface, and enhancement of x-ray radiopacity to improve the visibility of an implanted medical device. The implantable medical devices of the present invention also comprise radioactive medical devices which include radioisotopes such as 169Yb and 125I.

Un dispositif médical implantable selon la présente invention comprend un corps, tel qu'un stent ou un fil, et un isotope présentant une grande section transversale d'activation neutronique, tel que des isotopes ?168¿Yb ou ?124¿Xe, implantés par implantation ionique sur la surface du corps. L'utilisation d'isotopes présentant de grandes sections transversales d'activation neutronique permet d'utiliser un choix plus étendu de substrats, y compris des substrats en acier inoxydable, en nickel, en titane et en alliages de ces métaux, étant donné que le temps nécessaire à l'activation neutronique du dispositif est réduit. Un revêtement de matière à haute densité peut être employé pour servir plusieurs objectifs utiles, tels que le confinement de particules bête indésirables provenant d'espèces radioactives à période longue, la création d'une surface biologiquement inerte et l'augmentation de la radio-opacité pour améliorer la visibilité d'un dispositif médical implanté. Les dispositifs médicaux de cette invention comprennent également des dispositifs médicaux radioactifs contenant des radio-isotopes tels que ?169¿Yb et ?125¿I.

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