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Slender instruments designed to penetrate by puncturing into the tissues, blood vessels, and/or organs; they typically consist of a hollow, metallic (e.g., stainless steel) cannula beveled at one end to form a point; the other end of the cannula is mounted in a hub, which has a specially formed cavity called a female Luer connector. Most needles are used for injection, infusion, and/or withdrawal (aspiration) of gases, liquids, and semisolids; some needles are designed for suturing tissues or for other special procedures, including biopsy, dental, ophthalmic, cardiac, and surgical procedures.
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