An insulin port functions as a medication delivery channel directly into the subcutaneous tissue (the tissue layer located just beneath the skin). When applying the injection port, an insertion needle guides a soft cannula

Cannula

A cannula or canula is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of data...

 (a small, flexible tube) under the skin. Once applied, the insertion needle is removed and only the soft cannula remains below the skin, acting as the gateway into the subcutaneous tissue.

To inject through an insulin port the needle of a syringe

Syringe

A syringe is a simple pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled and pushed along inside a cylindrical tube , allowing the syringe to take in and expel a liquid or gas through an orifice at the open end of the tube...

 or insulin pen

Insulin pen

An insulin pen is used to inject insulin for the treatment of diabetes. It is composed of an insulin cartridge and a dial to measure the dose, and is used with disposable Pen needles to deliver the dose.-Types of pens:...

 is used. It is usually used to deliver insulin

Insulin

Insulin is a hormone central to regulating carbohydrate and fat metabolism in the body. Insulin causes cells in the liver, muscle, and fat tissue to take up glucose from the blood, storing it as glycogen in the liver and muscle....

 through the use of an insulin pump

Insulin pump

The insulin pump is a medical device used for the administration of insulin in the treatment of diabetes mellitus, also known as continuous subcutaneous insulin infusion therapy.The device includes:...

. The needle remains above the surface of the skin, while the medication is immediately delivered through the soft cannula and into the subcutaneous tissue.