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The Sirius MRI Marker NS is a component device indicated as an accessory for use in conjunction with brachytherapy seed carrier sleeves and radionuclide brachytherapy seeds containing one of the following isotopes: Iodine 125 (1251), Palladium 103 (103Pd) or Cesium 131 (131Cs). It is indicated for permanent interstitial implantation in the prostate of patients with confirmed prostatic malignancy. The Sirius MRI Marker NS is intended to facilitate the anatomical localization of seeds after they have been implanted in the prostate of a patient with confirmed prostatic malignancy. It is intended to be imaged under MRI within sixty (60) days of implantation. The Sirius MRI Marker NS is supplied non-sterile and will need to be sterilized by the end-user using either gamma radiation or ethylene oxide.

C4 Imaging's Sirius MRI Marker NS consists of a sealed polyether ether ketone (PEEK) polymer capsule containing a cobalt chloride:N-Acetylcysteine solution. It is used as an accessory to radionuclide sources (seeds) during prostate brachytherapy procedures. The length of the capsule is 5.5 mm and the diameter is 0.8 mm. The Sirius MRI Marker NS will be supplied non-sterile and will be sterilized by the end-user using ethylene oxide or gamma radiation.