Abstract: A modular device for implanting radioactive seeds in an animal body through a needle implanted in the body. The device comprises an electronic control device controlling a pushing drive, a seed and spacer supply container, a multichannel holder for seed-spacer trains. A tube connects between the multichannel holder and the needle. The needle is retractable by retracting means coupled to the needle. Optionally the retracting means are controlled by the electronic control device. The device may also be embodied in a combination of a seed loading module in which trains of seeds are loaded in channels in a removable multichannel holder and a seed implanting module in which trains of seeds from a multichannel holder are pushed into needles implanted in the body. Parts that may be contaminated with blood are made removable for sterilization or disposal.

Abstract: An elongated radioactive element to be fastened to one end of an elongated wire-shaped element, and provided with a front retaining part, a connecting part, and a rear retaining part, as well as segment-shaped elements which are radioactive or are to be made radioactive, which are provided with a center bore and which, enclosed between the front and rear retaining parts, are placed, one behind the other, by means of the center bore over the connecting part and can tilt with respect to each other, all in such a manner that the radioactive element is an elongated member which is supple and flexible over the greatest part of its length, coupling means being provided for connecting the radioactive element to the elongated wire-shaped element.