MEDTRONIC VASCULAR: NV-4-8-HELIX

The Concerto detachable coil system has coils available in diameters ranging from 2 to 20 mm and up to 50 cm in length. A complete list of the available sizes and lengths can be found in Table. With a variety of diameters and lengths, this coil system allows for precise and controlled embolization of many different arterial or venous segments. The detachment mechanism is mechanical and highly reliable. It is important to use an appropriately sized microcatheter to avoid "accordioning" of the coil inside the microcatheter. This is especially important when using 2 or 3 mm long coils (eg, 2 mm x 8 cm). In our experience, a maximum microcatheter inner diameter of 0.021 or 0.025 in. should be used for smaller diameter, long-length coils, whereas 0.027 or 0.028 in. inner-diameter microcatheters can be used for larger-diameter coils. The advantages of this coil system include controlled detachment, small microcatheter compatibility, a variety of size options, and excellent softness and conformability.