What Is an Implanted Port? A Plain-Language Guide

Last verified: October 6, 2026. An implanted port, often called a port, a chest port or a venous access port, is a small medical device placed completely beneath the skin. It consists of a small chamber, called the reservoir or portal, attached to a thin catheter that leads into a large vein near the heart. When treatment is needed, a clinician inserts a special needle through the skin into the port, and fluids or medicines flow through the catheter into the bloodstream. Between uses, nothing remains outside the body. This guide explains what an implanted port is, how it is built, the main types, how it differs from other access devices, and why it matters to people who purchase and manage clinical supplies. It is general information, not clinical or safety training; always follow your institution’s procedures and the manufacturer’s instructions.

What Is an Implanted Port?

An implanted port is a form of long-term central venous access. The catheter portion is the same sort of tube used in other central lines, with its tip resting in a large central vein. The distinctive feature is the other end: instead of exiting through the skin, the catheter connects to a small hub that sits in a pocket under the skin, usually on the upper chest or sometimes in the upper arm. The top of the hub is a thick, self-sealing silicone septum. A needle can pass through it many times, and the septum closes again when the needle is withdrawn.

From the outside, a port appears as a small, soft bump under the skin. There is no external tubing, no exposed connector and no dressing to maintain when it is not in use, which many people find easier to live with, especially for treatment that continues for months or years.

Why It Exists: The Problem an Implanted Port Solves

Some treatments, such as long courses of chemotherapy, require repeated access to the bloodstream over a long period. Using small veins in the arms again and again is uncomfortable and can damage them. Some medicines are also too irritating to be given through small veins. External central lines such as a PICC or tunneled catheter solve part of the problem but leave a segment outside the body that needs daily care, limits some activities such as swimming and carries ongoing exposure to the outside environment.

A port is designed for people who need long-term, intermittent access. When it is not being used, it is closed and covered by skin, which makes everyday life simpler and can lower the burden of routine care. When it is needed, it provides a reliable entry point for infusions and blood draws. That trade-off, a minor procedure up front in exchange for lower day-to-day maintenance, is the main reason ports are chosen.

The Parts of an Implanted Port

• The port body or housing — the small, firm outer shell that sits under the skin. It is usually made of plastic, titanium or a similar biocompatible material, and it protects the reservoir.
• The septum — the thick, self-sealing silicone membrane on top, through which the needle is inserted. It is designed to withstand many needle punctures.
• The reservoir — the small chamber beneath the septum that receives the medicine or fluid and funnels it into the catheter.
• The catheter — the thin, flexible tube that connects the port to the vein, usually made of silicone or polyurethane, and often with a radiopaque marking so that it is visible on an X-ray.
• The connection or lock — the junction where the catheter attaches to the port, which is designed to stay securely joined.
• Suture holes or anchor points — small holes on some designs that allow the housing to be fixed in its pocket.
• Access needle — a specially designed non-coring needle, usually with a bent shape and attached tubing, that passes through the septum when the port is used. It is a separate item from the implanted device.

Who Uses an Implanted Port

Surgeons, interventional radiologists and other trained physicians place ports, usually as a short procedure with local anesthetic or sedation. Oncology and hematology teams are the most common users, as people with cancer or blood disorders often need long-term treatment. Others who may use ports include people who need regular intravenous therapy for chronic conditions, repeated infusions or frequent blood sampling. Nurses with specific training access the port, run infusions, flush it and withdraw blood according to protocol. Pharmacists prepare the medicines delivered through it. Some research settings also use implanted ports in animal models to allow repeated dosing or sampling.

Types of Implanted Ports

• Single- and double-lumen ports — a single-lumen port has one reservoir and one channel, while a double-lumen port has two so that separate infusions can run independently.
• Standard and low-profile ports — low-profile designs are smaller and flatter, often used for children or for people with little tissue over the implant site.
• Chest and arm ports — chest placement is typical, while upper-arm ports are an alternative that some patients and clinicians prefer.
• Power-injectable ports — designed to withstand the higher pressure used for contrast injections in certain imaging, in addition to routine use. Such ports are often marked so they can be recognised.
• Plastic and titanium housings — housings differ in material, weight and how they appear on certain imaging scans.
• Pre-attached and attachable catheter designs — some ports come with the catheter already attached, while others have a catheter that is connected during placement.

How an Implanted Port Differs from Related Devices

• Port vs. PICC line — a PICC line is a catheter that enters through an arm vein and has a segment that remains outside the skin. A port has no external segment when not in use. PICCs are often used for treatment lasting weeks to months, and ports for intermittent treatment over a longer period, though the choice depends on the individual.
• Port vs. other central lines — a central venous catheter is the broader category that includes ports, PICCs and tunneled lines. A port is the fully implanted version.
• Port vs. standard IV — an IV catheter is a short tube placed in a small vein for brief use, and is removed after treatment. A port stays in the body between treatments.
• Port vs. infusion pump — the port is an entry point for fluids. An IV infusion pump is an external machine that can control the flow of a medicine through that entry point, and some portable pumps connect to ports for ambulatory infusions.
• Port vs. subcutaneous injection port — some devices are placed under the skin for other purposes, such as an insulin infusion site. They do not lead to a central vein and are different devices.

Practical Relevance for Research Administration and Procurement

Implanted ports are an implant product as well as a clinical access device, and they raise several procurement and compliance considerations.

• Implant tracking. Because a port stays inside the body, institutions usually record the model and lot number so the device can be traced if a safety notice is issued. Systems for implant records are part of the cost of using them.
• Port and needle compatibility. Access needles must be non-coring and of an appropriate gauge and length for the port. Buying the right needle for the port in use is as important as buying the port itself, and the wrong choice can damage the septum.
• Power-injection labelling. Sites that use contrast imaging need to be sure which ports are rated for it and how that status is documented for patients.
• Placement kits. Many programs buy implantation kits with instruments, drapes and closure supplies, and the procedure requires an operating or procedure room with imaging.
• Ongoing consumables. Flushes, caps, dressings for the access site while the needle is in, and sharps containers are recurring purchases linked to each use.
• Research and trials. Studies with long treatment schedules may specify or fund port placement. Budgets for those studies should include placement, maintenance and eventual removal.
• Training. Accessing a port needs specific training, and simulation models of ports are widely used for teaching.

Frequently Asked Questions

What is an implanted port used for?

It is used for repeated access to the bloodstream, to give medicines such as chemotherapy, fluids, nutrition or blood products, and to draw blood samples, over a long period.

Is a port the same as a PICC line?

No. Both are types of central venous access, but a PICC has a segment outside the skin, while a port is entirely beneath the skin and is accessed with a needle when needed.

Can you see an implanted port?

Usually it appears as a small, smooth bump under the skin, often on the upper chest. Nothing is visible outside the body when the port is not in use.

How is a port accessed?

A trained clinician uses a special needle that passes through the skin and the self-sealing septum into the reservoir. The exact technique follows the manufacturer’s instructions and the facility’s protocol.

How long can a port stay in?

Ports are designed for long-term use and can stay in place for as long as they are needed and working well. The treating team decides when it is no longer needed and removes it in a minor procedure.

Why would someone choose a port rather than another type of line?

A port has no external parts between uses, which can make daily life simpler and may reduce routine maintenance. It does require a minor procedure to place and a needle each time it is used, so the choice is made by the patient and care team together.