The modern market offers a wide range of tools for insulin administration. Insulin needle types are defined by several key characteristics that affect injection comfort and safety.
1. Needle sizesNeedle diameter and sharpness are interrelated: the thinner the shaft, the sharper it is and the less painful the injection. Thickness is indicated by the symbol G and measured on the Gauge scale, where values are inversely proportional to millimeter sizes. For example, 33G is thinner than 28G.Available needle sizes:
- diameter: 0.23 to 0.30 mm,
- length: 4 to 12.7 mm.
This range allows selection of an appropriate option based on the patient’s individual characteristics. Needles are made of medical steel and come in various sizes and diameters from 23G to 33G (0.23 mm to 0.30 mm) and penetration depths from 4 mm to 12.7 mm.
2. Frequency of useInsulin needles are strictly single‑use. After injection, they must be disposed of and must not be reused to avoid:
- infection,
- tissue damage,
- introduction of microorganisms into the puncture site.
Until use, needles must be stored under sterile conditions and opened immediately before injection.
3. Cap colorColor coding helps quickly identify needle length and thickness. One of the most practical systems is the nomenclature used by the INSUPEN brand.
Example color gradation:
- Green shades — thinnest needles (0.23 mm), length 4 to 8 mm: the darker the color, the longer the needle.
- Blue — medium‑size needles (0.25 × 8 mm).
- Lilac — 0.25 × 5–6 mm.
- Yellow — 0.30 × 8 mm.
- Pink — 0.33 × 12 mm — the longest and thickest.
How to choose insulin needlesInsulin needle selection should be done together with a physician to ensure therapy safety and patient comfort. Several factors are taken into account.
1. Physiological characteristicsWeight and body type are the main parameters:
- Patients with a high body mass index and pronounced subcutaneous fat are suited to 8–12 mm needles.
- Lean individuals require short needles up to 5 mm.
- For average body type, lengths from 5 to 8 mm are typically used.
2. Pharmaceutical considerations (injection technique)The insulin injection technique influences needle length selection:
- For 90° injection into a skin fold, needles no longer than 8 mm are usually chosen.
- For 45° injection, longer needles — from 8 mm and above — are preferable.
3. Age recommendationsChildren have thinner skin, so the following parameters are selected for them:
- length: 4–5 mm,
- thickness: 0.23–0.25 mm.
These parameters allow safe delivery of the drug strictly into the subcutaneous layer.
4. Gender differencesWomen typically have more pronounced subcutaneous fat than men. Therefore, female patients often require longer needles to accurately reach the subcutaneous tissue rather than muscle.
Как правильно ввести лекарственный препаратInsulin injection technique is critical. It is important to avoid injecting the drug into muscle tissue, as this leads to faster absorption and can cause:
- sharp blood sugar fluctuations,
- risk of hypoglycemia.
It is also important to note:
- Insulin syringe scales usually indicate units, not milliliters.
- Standard ratio: 1 ml of insulin = 40 units.
Basic rules for safe needle use- The needle must be securely screwed onto the syringe to prevent accidental detachment.
- Do not insert the needle too deeply to avoid intramuscular injection.
- Keep the cap after attachment — it will help safely remove the needle after injection.
Needles are made of medical steel and come in various sizes and diameters from 23G to 33G (0.23 mm to 0.28 mm) and penetration depths from 3.5 mm to 12 mm.