Syringe Needles Only
The most important criteria for selecting the correct needle size include the needle gauge, the needle length and the type of syringe connection.
Needle gauge is a measurement of the diameter of the needle, the larger the needles gauge number the thinner the diameter. The higher the viscosity of the fluid being injected, the lower the needles gauge number should be. However, the higher the needle gauge number, the less pain and bruising for the patient.
Needle length is usually provided in inches. Half inch to 5/8 inch needles are the most often selected needle length for intradermal and subcutaneous injections. Intramuscular injections usually call for a needle length of 7/8 inch to 1-1/2 inch.
Syringe to Needle Connection
The connection between the needle and the syringe can play an important role in the selection process. Some syringe-needle combinations are detachable while others are fixed in which the needle is permanently attached to the syringe. For instance, many diabetic syringe needles are non-detachable and these type of syringe-needle combos are less expensive. More syringe and needle combinations are manufactured to be detachable, allowing more flexibility and choices between what syringe you use and what needle you attached to the syringe.
There are several different types of connection hubs or syringe tips. The most popular syringe tips include Luer-Lock tips, slip tips, eccentric tips and catheter tips. Each syringe tip has a corresponding needle hub that connects with it. These connections are not interchangeable. In other words, you cannot connect a Luer Lock needle hub to a catheter tip syringe. For example, if you purchase a slip tip syringe, you should also purchase a slip tip type needle.