A biliary drain is a thin, flexible tube placed into the bile duct to restore the flow of bile from your liver to your small intestine. Bile is a digestive fluid your liver constantly produces, and when something blocks its path, it backs up, causing jaundice (yellowing of the skin and eyes), pain, and potentially dangerous infections. The drain creates an alternate route for bile to flow, relieving that backup.
Why You Might Need One
The most common reason for a biliary drain is a blockage or narrowing of a bile duct. When bile can’t flow normally, it stalls in the liver, a condition called cholestasis. This causes waste products to build up in your blood, which is why blocked bile ducts often turn your skin and eyes yellow.
Many different conditions can block a bile duct:
- Pancreatic cancer or bile duct cancer pressing on the duct from outside
- Gallstones lodged inside the duct itself
- Liver or gallbladder cancer
- Enlarged lymph nodes near the liver or pancreas
- Chronic inflammation and scarring of the bile ducts (primary sclerosing cholangitis)
- Inflammation of the pancreas (pancreatitis)
- Accidental injury to bile ducts during surgery
- Certain parasitic infections
Some drains are temporary, placed to relieve a blockage before surgery or while an infection clears. Others stay in longer when the underlying condition can’t be resolved right away, as is sometimes the case with advanced cancers.
Types of Biliary Drains
Biliary drains fall into two broad categories: external and internal. The type you get depends on where the blockage is, what’s causing it, and whether surgery is planned.
External Drains
An external drain passes through the skin into the bile duct, routing bile into a collection bag you wear outside your body. The most common version is placed through the skin of your abdomen directly into the liver (percutaneous transhepatic biliary drainage). Another type runs through the nose and down into the bile duct via a scope (endoscopic nasobiliary drainage), though this is less comfortable and mainly used short-term. External drains have lower rates of clogging and fewer post-procedure complications overall. In studies of patients with cancer-related blockages, external drainage cut the rate of infection and device malfunction roughly in half compared to internal drainage.
Internal Drains (Stents)
An internal drain is a small tube or stent placed entirely inside the body, connecting the blocked bile duct to the small intestine. Because bile continues to flow into the gut the way it normally would, this option is more natural for your body’s digestive cycle. There’s no external bag, no tube exiting the skin, and no visible device. The tradeoff is that internal stents can clog over time due to gut bacteria or food particles flowing backward into the stent. When that happens, a second procedure is needed to replace or clear it.
How the Drain Is Placed
For external or combination drains placed through the skin, the procedure is done by an interventional radiologist using real-time imaging. Ultrasound is often preferred because it lets the doctor see the bile ducts and blood vessels directly, reducing the number of needle passes needed. X-ray fluoroscopy (a continuous X-ray video) is the traditional alternative, and CT imaging is sometimes used as well.
You’ll receive local anesthesia at the insertion site, typically on your right side below the ribs. The radiologist guides a needle through the skin and into the liver, advancing it until it enters a bile duct. Once the needle is in the right position, a small amount of contrast dye confirms placement, and the needle is exchanged for the drainage catheter using a wire-guided technique. The aspirated bile is checked for signs of infection. Afterward, a dressing and bandage are applied over the insertion site.
For internal stents, the approach is endoscopic. A flexible scope passes through your mouth, down through the stomach, and into the small intestine where the bile duct opens. The stent is deployed across the blockage from the inside. This approach doesn’t require any incision through the skin.
Living With an External Biliary Drain
If you go home with an external catheter, daily care becomes part of your routine. The drain needs to be flushed twice a day at consistent times, using a prescribed amount of sterile saline (typically 3 to 10 milliliters, depending on your doctor’s instructions). Flushing keeps the tube clear of debris and prevents clogging. You push the saline through in one smooth, quick motion.
You can shower, but the dressing over the catheter site must stay completely dry. Waterproof adhesive covers work well for this, and showers should be kept to 15 minutes or less with warm (not hot) water. Baths, swimming, and hot tubs are off-limits as long as the catheter is in place.
Most people can return to work and exercise with a drain in place. The key restrictions are avoiding side-to-side stretching and repetitive bending, both of which can shift or dislodge the catheter. Always keep the tubing secured to your body with a stabilization device so there’s no pulling or tension on the tube, and be careful when getting dressed not to snag it.
Possible Complications
Biliary drain placement is not a minor procedure, and complication rates are significant. A multicenter study of over 330 patients who received percutaneous drains found that 62.8% experienced at least one complication within 30 days. That number sounds alarming, but it reflects the fact that most people needing biliary drainage are already quite ill, often with advanced cancer or active infection.
Infectious complications occurred in about 41% of patients, including bile duct infections (cholangitis) in 26%, bloodstream infections (sepsis) in 25%, and abscess formation in about 3%. Non-infectious problems occurred in about 35% of patients, with bile leakage being the most common at 29%, followed by severe bleeding at 7% and drain obstruction from sludge buildup or the catheter shifting out of position.
The most dangerous complication of any biliary blockage, whether from the disease itself or a malfunctioning drain, is an ascending infection of the bile ducts. This can progress rapidly to full-body sepsis and organ failure.
Warning Signs to Watch For
If you have a biliary drain, certain symptoms signal that something has gone wrong. The classic warning triad is fever, right-sided abdominal pain, and yellowing of the skin or eyes returning. Any one of these deserves prompt medical attention. If all three appear together, or if you also develop confusion, rapid heart rate, or low blood pressure, this suggests a serious infection that needs emergency care.
Other signs of drain malfunction include a sudden drop in the amount of bile draining into the bag, a change in bile color (from the normal dark green or golden to very pale, cloudy, or bloody), leaking around the insertion site, or the catheter visibly shifting position. If flushing the drain meets unusual resistance, that can indicate a clog.
How Long the Drain Stays In
The timeline depends entirely on why the drain was placed. In hepatobiliary surgery, drains are often removed within three to five days once the output drops below 50 milliliters per day and the fluid shows no signs of bile or blood. For drains placed to relieve a blockage before a planned surgery, the drain stays until bilirubin levels drop enough for the patient to safely undergo the operation, which can take one to several weeks.
For patients with inoperable cancers, the drain may remain indefinitely as a palliative measure, with periodic exchanges to prevent clogging. Internal stents in these cases are often preferred for quality of life, since they eliminate the external bag and daily flushing routine. When a drain is ready for removal, the criteria are straightforward: low output volume, no evidence of ongoing bile leak or infection, and confirmation on imaging that bile is flowing through its normal pathway again.