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  • Infusion catheters designed for insertion in the peripheral vasculature (typically in the basilic or cephalic veins) that are long enough to advance and locate their distal tip in the proximal portion of the extremity (e.g., upper arm), so x-ray verification is not needed. The length of these catheters is typically 10 to 20 cm (4 to 8 inches), and they are usually made of silicone elastomers (silastics) or polyurethane. These catheters may be inserted using a variety of techniques such as using a breakaway needle introducer, through an over-the-needle catheter, or over a guidewire using the Seldinger technique. Midline infusion catheters are usually used for several-week-long (typically two to four weeks) indwelling periods, but may also be used for short terms. They are used for peripheral therapies needing greater hemodilution, usually for isoosmotic or near-isoosmotic solutions.
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