Insulin Syringes

About

Insulin Syringes An insulin syringe is a medical syringe specifically designed for injecting insulin – the hormone used to control blood sugar – under the skin. It consists of a small plastic barrel (marked with graduated lines), a plunger, and a very fine needle. The syringe is filled by drawing insulin (from a vial or cartridge) into the barrel, and the plunger is then depressed to inject the insulin into the fatty tissue just under the skin (a subcutaneous injection) to enter the bloodstream. As one source explains, an insulin syringe’s “primary function [is] to draw up and inject insulin subcutaneously (under the skin) to help manage blood sugar levels.” . Because insulin doses are small, these syringes hold very small volumes (typically 1 milliliter or less) and have especially fine needles (usually 28–31 gauge) to minimize pain. The barrel is calibrated in insulin units (not just milliliters), so that each increment corresponds to a precise dose – for example, on a U-100 syringe each “unit” mark equals 0.01 mL of insulin. Design and Features Insulin syringes differ from general-purpose syringes mainly in scale and needle size. They come in only very small volumes and have extra fine needles. Common insulin syringe capacities are 0.3 mL, 0.5 mL, and 1.0 mL , corresponding to 30, 50, and 100 “units” of U-100 insulin (U-100 means 100 units per mL). Manufacturers typically color-code or label the plungers or packaging to indicate these sizes (for example, 0.3 mL syringes often have orange markings, 0.5 mL purple, etc.) for easy recognition. The needle is very thin – most often 28-, 29-, 30- or 31-gauge (a larger gauge number means a thinner needle) – and short (typically about 4–12 mm long) because insulin is delivered just under the skin. These dimensions strike a balance between comfort and effective delivery. Volume (capacity): Typically 0.3 mL (30 units), 0.5 mL (50 units), or 1.0 mL (100 units). Smaller syringes (e.g. 0.3 mL) are used for low-dose needs; larg