The Olsen clamp is a specialized surgical instrument used to perform intraoperative cholangiography during laparoscopic gallbladder removal. It combines a grasping clamp with a catheter delivery system, allowing a surgeon to cannulate the cystic duct and inject contrast dye so the bile ducts can be visualized on a fluoroscopy screen in real time. Because gallbladder removal is one of the most frequently performed surgeries worldwide, the Olsen clamp occupies a surprisingly prominent place in the operating room despite being a single-purpose tool.
What the Olsen Clamp Actually Does
During laparoscopic cholecystectomy, surgeons operate through small incisions using long instruments and a camera. The anatomy in the area where the gallbladder connects to the bile duct system can be tricky. Structures overlap, inflammation from gallstones can distort normal landmarks, and the consequences of accidentally cutting or clipping the wrong duct can be severe. Intraoperative cholangiography (IOC) is a technique that lets the surgeon see the internal plumbing of the bile ducts by injecting a radiopaque dye and taking a fluoroscopic image, essentially a live X-ray, while the patient is still on the table.
The Olsen clamp makes this possible during a laparoscopic procedure. It is a long, slender instrument that fits through a standard trocar port. At its working end is a small clamp that can grasp the cystic duct. Running through the shaft of the instrument is a catheter channel. Once the clamp has hold of the cystic duct, a fine catheter is advanced through the channel and threaded into the duct opening. Contrast dye is then injected through the catheter while fluoroscopic images capture the flow of dye through the biliary tree. The surgeon can see on the screen whether the common bile duct is clear, whether any stones have migrated out of the gallbladder and become lodged downstream, and whether the anatomy matches what they expected before making any irreversible cuts.
Why Imaging the Bile Ducts During Surgery Matters
The gallbladder sits tucked under the liver and connects to the biliary system through the cystic duct, which joins the common bile duct. The common bile duct carries bile from both the liver and gallbladder down to the small intestine. Accidentally injuring the common bile duct during gallbladder removal is one of the most feared complications in general surgery because repair is difficult and the long-term consequences for the patient can be serious, including recurrent infections, strictures, and the potential need for major reconstructive surgery.
Bile duct injury during laparoscopic cholecystectomy is uncommon, but it happens often enough to remain a real concern. Anatomical variations in the biliary tree are surprisingly common. Some people have accessory ducts, unusually short cystic ducts, or cystic ducts that insert into the common duct at unusual angles. When inflammation from acute cholecystitis has scarred or swollen the tissue around the gallbladder, these structures can become even harder to distinguish. A cholangiogram performed with the Olsen clamp gives the surgeon a roadmap of the patient’s individual anatomy before committing to dissection.
The other major reason for cholangiography is detecting common bile duct stones. Gallstones sometimes slip out of the gallbladder and travel into the common duct, where they can cause jaundice, pancreatitis, or infection. Preoperative imaging catches many of these, but not all. An intraoperative cholangiogram picks up retained stones that might otherwise be missed, allowing the surgeon to address them during the same operation rather than requiring a second procedure later.
How the Olsen Clamp Is Used Step by Step
Understanding the sequence helps make sense of why the instrument is designed the way it is. The procedure unfolds in the middle of a laparoscopic cholecystectomy, after the surgeon has identified and partially dissected the cystic duct but before the duct has been fully divided.
First, the surgeon places a clip on the cystic duct near the gallbladder to prevent stones or bile from leaking out of the gallbladder during the procedure. Then a small incision, called a cholangiocatheter incision or ductotomy, is made in the cystic duct between the clip and the junction with the common bile duct. The Olsen clamp is introduced through a trocar port. Its jaws are used to grasp the cystic duct near the ductotomy, stabilizing it. The catheter is then advanced through the clamp’s channel and gently threaded into the cystic duct through the small opening.
Once the catheter tip is seated in the cystic duct, contrast dye is injected slowly under fluoroscopic guidance. The surgical team watches a monitor as the dye fills the cystic duct, flows into the common bile duct, and drains down into the duodenum. If stones are present, they show up as dark filling defects, areas where the dye cannot pass. If the anatomy is variant, the dye highlights exactly where each duct goes. After the images are obtained and read, the catheter is withdrawn, the clamp is removed, and the surgeon proceeds with completing the cholecystectomy.
The entire cholangiogram typically adds around ten to fifteen minutes to the procedure, though this varies with the surgeon’s experience and the complexity of the anatomy.
Alternatives for Intraoperative Cholangiography
The Olsen clamp is not the only way to perform an IOC, though it remains one of the most widely used methods in laparoscopic surgery. Some surgeons prefer to pass a cholangiocatheter without using a dedicated clamp, instead using standard laparoscopic graspers to hold the cystic duct and threading the catheter freehand. This approach avoids needing the specialized instrument but can be fiddly, particularly in a duct that is small, inflamed, or difficult to access.
Another alternative is a purpose-built cholangiography catheter with an inflatable balloon tip. Once the catheter is inside the cystic duct, inflating the balloon anchors it in place without requiring a clamp to maintain position. These balloon-tipped systems can simplify the process but add their own cost and are not universally available.
Some surgeons bypass fluoroscopic cholangiography altogether and use intraoperative ultrasound to assess the bile ducts. Laparoscopic ultrasound can identify common bile duct stones and confirm anatomy without any dye injection or radiation exposure. It requires a different skill set and a specialized ultrasound probe, so adoption has been uneven across surgical practices.
A newer approach that has gained interest is near-infrared fluorescence cholangiography using indocyanine green (ICG) dye. The patient receives an intravenous injection of ICG before or during surgery, and a special camera system detects the fluorescence of the dye as it is excreted by the liver into the bile ducts. This can outline the biliary anatomy in real time without any catheter placement at all. ICG fluorescence does not reliably detect stones in the common duct, however, so it is more useful for anatomical mapping than for stone detection. Where both goals are needed, the Olsen clamp and traditional contrast cholangiography remain the standard.
The Debate Over Routine Versus Selective Cholangiography
One of the longest-running debates in general surgery is whether a cholangiogram should be performed during every laparoscopic cholecystectomy (routine IOC) or only when the surgeon suspects a problem such as a retained stone or confusing anatomy (selective IOC). This debate directly affects how often the Olsen clamp gets used.
Surgeons who favor routine cholangiography argue that performing the procedure on every patient catches unsuspected stones and provides a safety check on anatomy that can prevent bile duct injuries before they happen. The logic is straightforward: if the dye shows you are about to cut the wrong structure, you stop. Advocates of this approach point out that the additional time and cost are modest compared to the expense and morbidity of repairing a bile duct injury or retrieving a missed stone weeks later.
Surgeons who favor selective cholangiography argue that most patients have straightforward anatomy and no retained stones, making routine imaging unnecessary. They point to the added operative time, the radiation exposure (though small), and the risk of false-positive findings that lead to unnecessary additional procedures. A cholangiogram that shows a shadow or filling defect that turns out to be an air bubble, for instance, can prompt an exploratory procedure that was never needed.
Practice patterns vary widely by region and training. In some countries and surgical programs, routine IOC is taught as standard practice; in others, it is considered optional. There is no settled consensus, and the evidence on whether routine IOC meaningfully reduces the overall rate of bile duct injury has been debated for decades. What is clear is that in settings where IOC is performed, the Olsen clamp remains the workhorse instrument for the job.
Practical Considerations for the Instrument Itself
The Olsen clamp is a reusable stainless steel instrument that goes through standard sterilization between cases. Its catheter component may be disposable or reusable depending on the specific product. From a handling standpoint, the clamp is designed to operate like other laparoscopic instruments: a ring-handled grip at one end, a long shaft, and the working jaws at the distal end. The catheter runs through or alongside the shaft, controlled from the proximal end.
One practical quirk of the Olsen clamp is that it requires a certain minimum cystic duct diameter to work well. In patients with very small or contracted cystic ducts, threading the catheter can be difficult or impossible. Severe inflammation in the triangle of Calot, the area of tissue where the cystic duct and artery meet the liver, can make grasping the duct safely with the clamp challenging. In these situations, some surgeons abandon the cholangiogram attempt rather than risk injury. This is one reason the selective IOC camp argues the procedure is not always practical even when desired.
For surgical trainees, learning to use the Olsen clamp effectively is a recognized learning curve. The steps of making the ductotomy, grasping the duct, threading the catheter, and obtaining clear images all require practice. Simulation labs increasingly include cholangiography modules for this reason. An experienced surgeon can complete the entire cholangiogram in under ten minutes; a trainee performing their first few may take considerably longer, which creates pressure in busy operating room schedules.
Confusion With the Olsen-Hegar Needle Holder
If you search for “Olsen clamp,” you may encounter references to the Olsen-Hegar needle holder, which is a completely different instrument. The Olsen-Hegar is a combination tool used in open surgery and wound closure that merges a needle holder with built-in scissor blades. It lets a surgeon suture and cut thread with the same instrument, avoiding the need to switch tools. The “Olsen” in both names has led to occasional mix-ups, but the instruments share nothing in design, function, or surgical context. The Olsen-Hegar is a general-purpose suturing tool used across nearly every surgical specialty, while the Olsen cholangiography clamp is a single-purpose instrument built specifically for bile duct imaging during laparoscopic surgery.
Instrument Efficiency and the Operating Room Tray
The Olsen clamp is a specialized instrument that sits on a surgical tray alongside dozens of others. This raises a question that has drawn increasing attention from hospitals looking to control costs: how many instruments on a typical surgical tray actually get used during a given procedure?
A study evaluating vascular surgery instrument trays found that, on average, surgeons used only about 23% of instruments on a standard vascular tray and roughly 13% on an aortic tray during actual cases. After a review process, nearly half the instruments were removed from the vascular tray and over 60% from the aortic tray, saving an estimated six-figure sum in repurchase and annual resterilization costs and cutting setup time by several minutes per case.1Journal of Vascular Surgery. Optimization of surgical instrument trays and cost analysis in vascular surgery While that study focused on vascular surgery specifically, the principle applies across surgical specialties. General surgery trays for cholecystectomy carry a mix of instruments that may or may not be needed for any individual patient. The Olsen clamp is a perfect example of an instrument that sits on the tray “just in case” when a selective IOC approach is used, getting opened and sterilized for every case but only used in a fraction of them.
Some hospitals have responded by creating separate cholangiography kits that are only opened when the surgeon decides during the case that an IOC is warranted. This keeps the Olsen clamp and its associated catheter out of the standard tray, reducing unnecessary sterilization cycles and freeing up tray space. The tradeoff is a short delay when the kit needs to be retrieved and opened mid-case, but most operating room teams find this preferable to sterilizing specialized instruments that go unused in the majority of procedures.
How ICG Fluorescence May Reshape the Role of the Olsen Clamp
Indocyanine green fluorescence imaging has been one of the more exciting developments in laparoscopic surgery over the past decade, and it has real implications for the future of the Olsen clamp. ICG is a dye that fluoresces under near-infrared light. When injected intravenously, it is taken up by the liver and excreted into bile, making the bile ducts glow on a special camera. Many modern laparoscopic camera systems now include a near-infrared mode that can detect ICG fluorescence without any additional hardware.
The appeal of ICG cholangiography is that it requires no catheter, no ductotomy, no clamp, and no radiation. The surgeon simply switches the camera to fluorescence mode and can see the cystic duct and common bile duct outlined in green against the surrounding tissue. This real-time anatomical mapping happens continuously, not just as a single snapshot like a contrast cholangiogram. Surgeons can check the anatomy repeatedly during dissection without interrupting the procedure.
The limitation, as mentioned earlier, is that ICG fluorescence does not reliably identify stones inside the bile ducts. It shows you where the ducts are, but not what is inside them. For patients at high risk of retained common duct stones, a traditional contrast cholangiogram with the Olsen clamp or an intraoperative ultrasound still provides information that ICG cannot. The likely trajectory is that ICG fluorescence will increasingly replace the Olsen clamp for the anatomical-mapping purpose of cholangiography, while the clamp will remain necessary for the subset of patients who need direct evaluation for retained stones. In practice, this could mean the Olsen clamp shifts from a frequently used instrument to one pulled out only in specific clinical scenarios, further reinforcing the trend toward keeping it in a separate kit rather than on the standard tray.