Intravenous indwelling needle is mainly aimed at patients who need long-term intravenous administration and also need to protect venous blood vessels. For example, after the operation, it will take about a week. Clinically, one or two indwelling needles are usually buried in the operating room to facilitate postoperative antibiotics and nutrition.

There are basically no absolute contraindications, and people with large vascular fragility will be more likely to get out of the needle and the detention time may be shorter; People with strong coagulation function are easy to block the needle tip; Manic patients and patients with self-injury tendency are not suitable for indwelling needles; Traumatic patients can't stay at the wound; In addition, even if venous indwelling needle is not used for intravenous infusion, the activities of indwelling parts are restricted, and life behaviors such as bathing are also restricted, which is very inconvenient. Whether specific patients use indwelling needles depends on the situation.

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