A tunneled central venous catheter is a thin, flexible tube placed into a large vein near the heart, with a portion routed under the skin before exiting the body on the chest wall. This design gives healthcare teams reliable access to the bloodstream for treatments that need to be delivered over weeks, months, or even years. If you or someone you care about has been told they need one, here’s what the device looks like, how it’s placed, and what living with one involves.
How It Differs From a Standard IV
A regular IV goes directly through the skin into a vein, usually in the hand or arm. A non-tunneled central line does the same thing but targets a larger vein in the neck or chest. Both are short-term solutions.
A tunneled catheter adds an extra step: instead of entering the skin right where it enters the vein, the catheter travels several inches through a path carved under the skin before it exits on the chest. That distance between the vein entry point and the skin exit point is the “tunnel,” and it serves two purposes. First, it makes the catheter harder to accidentally pull out. Second, it puts space between the outside world and the bloodstream, which helps reduce infection risk. Tunneled catheters are designed to stay in place for more than a month and can remain functional for years.
Parts of the Catheter
The catheter itself is typically made of polyurethane and is quite narrow. At the outer end, it has one, two, or three separate openings called lumens. Multiple lumens let clinicians draw blood from one channel while delivering medication through another at the same time.
Wrapped around the catheter under the skin is a small fabric cuff, usually made of a material called Dacron. Over the first few weeks after placement, your body’s tissue grows into this cuff, anchoring the catheter in place so stitches are eventually no longer needed. The cuff also acts as a physical barrier, blocking bacteria from traveling along the catheter toward the bloodstream. The cuff is positioned about two to three finger-widths from where the catheter exits the skin.
Some tunneled catheters include a built-in valve at the tip (the Groshong design) that stays closed when the line isn’t in use. This prevents blood from flowing back into the catheter and eliminates the need for a blood-thinning flush solution between uses.
Common Types
Three names come up most often when discussing tunneled catheters:
- Hickman catheter: The most widely used version. It has two lumens and ranges from 7 to 9 French (a unit of catheter diameter). It’s the go-to choice for chemotherapy, long-term antibiotics, and nutrition delivered through the vein.
- Broviac catheter: Essentially a single-lumen version of the Hickman. Its smaller size makes it common in children and infants who need long-term venous access.
- Groshong catheter: Distinguished by its closed-end valve. Because the valve prevents blood from backing up into the line, it can be flushed with saline alone rather than requiring a blood-thinning lock solution.
Why You Might Need One
Tunneled catheters are chosen when treatment requires frequent or continuous access to the bloodstream over a long period. The most common reasons include chemotherapy regimens that span months, total parenteral nutrition (IV feeding) for people whose digestive systems can’t absorb food normally, and long courses of IV antibiotics for serious infections like endocarditis. They’re also widely used for hemodialysis, particularly as a temporary bridge while a more permanent dialysis access point is being created and given time to heal.
The key factor is duration. If treatment will last more than a few weeks, a tunneled line typically offers better comfort and lower complication rates than a standard central line that would need to be replaced repeatedly.
How the Placement Works
Placement is a procedure done under local anesthesia, sometimes with sedation. It typically takes 30 to 60 minutes. The most common approach uses a vein in the neck (the internal jugular), with the catheter tip ending up in the large vein just above the heart.
The process begins with the doctor accessing the vein using a needle guided by ultrasound. A thin guidewire is threaded through the needle into the vein, and the needle is removed. A small incision, roughly half a centimeter, is made at the vein entry site, and the opening is gradually widened using dilators passed over the wire. A second small incision is made lower on the chest where the catheter will exit the skin.
Using a tunneling tool, the catheter is then pulled through the tissue under the skin from the chest exit site up toward the neck, positioning the fabric cuff within the tunnel. The catheter tip is fed into the vein through the dilated entry point. X-ray imaging (fluoroscopy) confirms the tip is sitting in the correct position at the junction of the large vein and the heart. The incisions are closed with a few stitches, and a dressing is applied.
Living With a Tunneled Catheter
For the first few weeks, stitches hold the catheter in place while tissue grows into the cuff. During this period, you’ll want to avoid heavy lifting or vigorous upper-body movement that could shift the catheter. Most people are advised to wait about four weeks before resuming strenuous activity.
Keeping the catheter functioning requires regular flushing. The standard approach is a 10 mL saline flush before and after any medication or blood draw. After blood products or thick solutions like IV nutrition, a larger 20 mL flush is used. Flushing works best when done in short, pulsing bursts rather than one smooth push, as the turbulence helps clear the inner walls of the catheter. When the line isn’t in active use, it’s locked with a small amount of solution (saline or a dilute blood thinner, depending on the catheter type) to prevent clotting inside the tube. For long-term catheters not used daily, a weekly lock is the standard recommendation.
The exit site needs to stay clean and dry. Dressings are typically changed once a week, or sooner if they become wet or loose. Swimming and submerging the site in water are generally off-limits. Showers are usually fine with a waterproof cover over the dressing.
Infection Risk
Infection is the most significant risk with any central line. The tunneled design reduces this risk compared to non-tunneled lines, partly because of the subcutaneous cuff acting as a barrier and partly because of the physical distance between the exit site and the vein. In one comparative study of hemodialysis patients, catheter-related bloodstream infection rates were similar between tunneled and non-tunneled lines during the first six weeks, but tunneled catheters showed better long-term survival beyond that point. Mechanical problems like kinking or malfunction were also roughly half as frequent in tunneled lines.
Signs of infection to watch for include redness, swelling, warmth, or drainage at the exit site, along with fever or chills that come on suddenly, especially during or shortly after the line is used. If the area around the catheter becomes increasingly tender or you notice pus, that warrants prompt attention.
Other Complications to Recognize
Beyond infection, the issues that can develop include catheter occlusion (when the line becomes partially or fully blocked, often by a blood clot), catheter migration (when the tip shifts out of its ideal position), and accidental dislodgment. Modern catheters use split-tip or step-tip designs that improve flow and resist kinking, but blockages can still happen, particularly if flushing is inconsistent.
You might notice that the catheter draws blood sluggishly or that infusions slow down. Sometimes flushing feels like it meets resistance. These are signs the line may be partially blocked. Complete inability to flush or withdraw blood means the line needs clinical evaluation. If the catheter appears to have moved, with more tubing visible outside the body than before, or if the cuff becomes visible at the exit site, don’t push it back in yourself.
How Removal Works
When treatment is finished or the catheter is no longer needed, removal is a relatively straightforward bedside procedure. You’ll lie flat or at a slight incline. The dressing is removed, the site is cleaned, and any stitches are cut. You may be asked to hold your breath or bear down gently (a technique that increases pressure in the chest veins and prevents air from entering). The catheter is then pulled out with steady, gentle traction. If the cuff has fully integrated into the tissue, some resistance is normal, and the area around the cuff may need a small amount of local anesthetic and blunt dissection to free it.
Once the catheter is out, firm pressure is applied for about five minutes until bleeding stops, and an airtight dressing is placed over the site. That dressing stays on for at least 24 hours. The small wounds heal quickly, typically within a week, and leave minimal scarring.