A peritoneal catheter is a thin, flexible tube placed through the abdominal wall into the peritoneal cavity, the fluid-lined space surrounding the intestines, liver, and other abdominal organs. Its most common role is in peritoneal dialysis, where it serves as the permanent access point for flushing dialysis fluid in and out of the abdomen to filter waste from the blood when the kidneys can no longer do the job. But peritoneal catheters also appear in oncology, palliative care, neurosurgery, and even pressure monitoring, making them one of the more versatile implanted devices in medicine. The design, placement, and management of these catheters have evolved substantially since their origins in the mid-twentieth century, though complications like infection and mechanical failure remain genuine concerns for the thousands of patients who rely on them.
How the Catheter Makes Dialysis Possible
In peritoneal dialysis, the catheter is the lifeline. A sugar-based solution called dialysate flows through the catheter into the peritoneal cavity, where the peritoneal membrane acts as a natural filter. Waste products and excess fluid cross from the bloodstream through the membrane’s tiny blood vessels and into the dialysate, driven by differences in concentration and osmotic pressure. Water movement across the membrane depends partly on specialized water channels called aquaporins, which respond to the sugar concentration in the dialysate to pull fluid out of the body.1PubMed Central. The Peritoneal Membrane and Its Role in Peritoneal Dialysis After a set dwell time, the used dialysate drains back out through the same catheter, carrying waste with it. The cycle repeats multiple times a day in continuous ambulatory peritoneal dialysis (CAPD), where the patient manually exchanges the fluid, or overnight with a machine in automated peritoneal dialysis (APD).
One way researchers quantify this process is by measuring how effectively the membrane moves water in response to the sugar gradient. In testing, the peritoneal fluid absorption rate runs close to about 1 mL per minute, and each gram of glucose absorbed from the dialysate pulls roughly 17 mL of fluid out of the body.2PubMed Central. Threefold peritoneal test of osmotic conductance, ultrafiltration efficiency, and fluid absorption Those numbers vary from person to person and change over time as the membrane ages with long-term dialysis use. This is why nephrologists periodically test membrane function to adjust prescriptions.
A Brief History of the Device
The first peritoneal access devices were not purpose-built at all. Surgeons in the early twentieth century used equipment borrowed from other fields: trocars, rubber catheters, and sump drains designed for general surgery, urology, or gynecology. After World War II, published reports of peritoneal dialysis proliferated, most using a continuous-flow technique with rubber tubing for inflow and sump drains for outflow. By the late 1940s, intermittent peritoneal dialysis began to gain favor, and the first purpose-designed peritoneal access devices appeared. These were modified sump drains, but the real innovation came from Ferris and Odel, who introduced a soft polyvinyl tube weighted at the tip to keep it settled in the pelvic gutter, where drainage works best.3PubMed. History of peritoneal access development
The 1960s brought two critical discoveries. First, silicone rubber turned out to be far less irritating to the peritoneal membrane than earlier plastics. Second, polyester velour encouraged tissue to grow into and around it, anchoring the catheter and sealing the tunnel through the abdominal wall. In 1968, Tenckhoff and Schechter combined both ideas into a silicone rubber catheter fitted with polyester (Dacron) cuffs, one cuff for acute use and two for chronic patients who would need the catheter for months or years.4PubMed. History of peritoneal access development That two-cuff Tenckhoff catheter became the template for virtually every peritoneal dialysis catheter that followed and remains in wide use today.
Design Variants and Which Ones Perform Best
Though the Tenckhoff remains the baseline, multiple variations exist. The two main design differences are the shape of the outer (subcutaneous) tunnel and the shape of the intraperitoneal tip. A “swan neck” catheter has a permanent bend between the two cuffs, which angles the exit site downward and theoretically reduces infection risk by helping fluid drain away from the skin opening. The tip can be straight or coiled (sometimes labeled “S” for straight and “C” for coiled, though in some literature “S” refers to the spiral/coiled configuration).
A network meta-analysis pooling randomized controlled trials compared four main combinations of these features. Swan neck catheters with a coiled tip showed the lowest rate of catheter tip migration, while Tenckhoff catheters with a coiled tip were the most effective at reducing overall catheter dysfunction, migration-related dysfunction, and the need for catheter removal. Both coiled-tip variants ranked highest for one- and two-year technique survival, meaning patients using those designs stayed on peritoneal dialysis longer without needing to switch to hemodialysis.5PubMed Central. Comparison of different peritoneal dialysis catheters on complications and catheter survival: A network meta-analysis of randomised controlled trials In practice, the choice often depends on surgeon familiarity and patient anatomy, but the evidence favors coiled tips when migration is a concern.
How the Catheter Gets Placed
There are three main approaches to inserting a peritoneal dialysis catheter: open surgical dissection, laparoscopic placement, and percutaneous (needle-and-guidewire) insertion. Open surgery involves a small incision near the navel and direct visualization of the peritoneum. Laparoscopic placement uses a camera and small instruments through tiny incisions, giving the surgeon a view of the entire abdominal cavity. Percutaneous placement threads the catheter using imaging guidance, typically ultrasound and fluoroscopy, under local anesthesia and conscious sedation rather than general anesthesia.
A meta-analysis comparing laparoscopic and percutaneous techniques found that laparoscopic insertion may reduce the risk of postoperative bleeding, but takes longer in the operating room. Beyond that, the two approaches showed no significant differences in hospital stay, early or late complications, peritonitis, exit-site infections, catheter malfunction, hernia, or fluid leakage.6PubMed Central. Percutaneous versus laparoscopic catheter placement for peritoneal dialysis: a meta-analysis This means the “best” technique depends less on the method itself and more on the clinical situation. In resource-limited settings, percutaneous placement under conscious sedation with ultrasound and fluoroscopy guidance is a practical alternative that avoids the cost of an operating theater and general anesthesia.7South African Journal of Radiology. Percutaneous placement of peritoneal dialysis catheters in resource-limited developing countries as an alternative to conventional placement methods
Infection and the Biofilm Problem
Infection is the most feared complication of any peritoneal catheter. Peritonitis, an infection of the peritoneal cavity, can be painful, dangerous, and sometimes forces the catheter to be removed entirely. The dominant route of infection runs along the catheter itself. Bacteria from the skin at the exit site colonize the outer surface of the catheter, creep through the Dacron cuff, and eventually reach the peritoneal cavity. This colonization takes the form of biofilms: bacteria encase themselves in a sticky matrix that clings to the catheter surface and resists both the immune system and antibiotics. Classic research on Tenckhoff catheters in animal models demonstrated this route of progressive bacterial colonization extending from the exit site, through the cuff, and into the abdomen.8PubMed. Peritonitis in peritoneal dialysis: bacterial colonization by biofilm spread along the catheter surface Biofilm colonization can exist without causing peritonitis, but once bacteria break free into the peritoneal fluid, full-blown infection follows.
Treatment typically starts with antibiotics delivered directly through the catheter into the peritoneal cavity. If the infection clears within a few days, the catheter stays. But if the peritoneal fluid does not clear after five days of appropriate antibiotics, the infection is classified as refractory and the catheter should be removed.9PubMed Central. Peritoneal Dialysis–Associated Peritonitis: Suggestions for Management and Mistakes to Avoid The same applies to severe tunnel infections, where the tract between the skin and the peritoneum becomes deeply infected.10PubMed. After peritoneal dialysis discontinuation: When will we remove peritoneal dialysis catheter? Removing a catheter that a patient depends on for dialysis is a serious decision, because it means a temporary or permanent switch to hemodialysis, which requires different vascular access and typically involves hospital-based treatments.
For exit-site and tunnel infections that resist antibiotics but have not progressed to frank peritonitis, several less drastic surgical rescue techniques exist. Curettage, cuff-shaving, removal of just the superficial cuff, and partial reimplantation have all been used, with reported success rates ranging from 70% to 100%.11Oxford Academic (Journal of Nephrology). The use of mini-invasive surgical techniques to treat refractory exit-site and tunnel infections in peritoneal dialysis patients: a clinical approach These options are worth considering before committing to full catheter removal.
Mechanical Complications
Catheters can malfunction for purely physical reasons that have nothing to do with infection. The main culprits are catheter tip migration, omental wrapping, fluid leaks, and hernias. Most mechanical complications occur early after placement, driven either by the surgery itself or by the sudden increase in abdominal pressure when dialysate is introduced.12PubMed Central. Complications of Peritoneal Dialysis Part I: Mechanical Complications
The omentum, a fatty apron of tissue hanging from the stomach and draping over the intestines, is the single biggest troublemaker. It tends to migrate toward foreign objects and can wrap around the catheter tip, blocking the drainage holes. In one surgical series, omental wrap accounted for about two-thirds of catheter malfunctions, with the remainder caused by catheter tip sequestration elsewhere in the abdomen.13PubMed. Laparoscopic salvage of malfunctioning peritoneal catheters When the omentum wraps the catheter, fluid can often still be pushed in but cannot drain back out, a characteristic pattern that tips off clinicians.
Laparoscopic salvage is the go-to approach. The surgeon frees the catheter from the omentum and repositions the tip in the pelvis. An elegant technique called omental folding goes a step further: after freeing the catheter, the surgeon folds the omentum upward and sutures it to itself, effectively shortening it so it cannot reach the catheter again. A polypropylene sling anchors the catheter in place through the abdominal wall. This approach achieved an 89% success rate in one series.14Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis. Omental Folding: A Novel Laparoscopic Technique for Salvaging Peritoneal Dialysis Catheters A modified open surgical revision technique has also shown very low rates of recurrent malfunction compared to standard approaches.15PubMed Central. A modified open surgical revision technique for malfunctioning peritoneal dialysis catheter
Hernias and leaks are the other common mechanical headaches. In a long-term study, roughly a third of peritoneal dialysis patients developed a hernia, a leak, or both. Hernias most often appeared at the umbilicus, while leaks clustered around the catheter exit site. Both complications occurred more frequently during CAPD than automated dialysis, likely because of the larger fill volumes used during the daytime hours in manual exchanges. Polycystic kidney disease was linked to higher hernia rates, while older age and higher body mass index raised the risk of leaks. About two-thirds of hernias required surgical repair, and recurrence was common even after surgery.16Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis. Risk Factors for Abdominal Wall Complications in Peritoneal Dialysis Patients
Peritoneal Catheters in Children
Placing a peritoneal catheter in a child, especially an infant, presents unique challenges. The abdominal wall is thinner, the omentum is proportionally larger relative to the peritoneal space, and young children cannot report subtle symptoms of malfunction the way adults can. Infants are significantly more likely to experience both leakage and hernias compared to older children.17PubMed. Peritoneal dialysis catheter placement, outcomes and complications Nearly half of pediatric patients in one large series needed reoperation for malfunction or infection, with a median catheter survival of only 11 months. Age under one year, prematurity, and the absence of omentectomy at the time of placement were all independently associated with higher rates of reoperation or death.18PubMed. Risk factors for morbidity and mortality in pediatric patients with peritoneal dialysis catheters
Omentectomy, or removal of part or all of the omentum at the time of catheter insertion, has emerged as one of the most impactful interventions in pediatric peritoneal dialysis. Patients who undergo omentectomy are far less likely to need catheter replacement and have significantly better catheter survival.19PubMed. Peritoneal dialysis catheter placement, outcomes and complications One pediatric surgical group that began routinely performing omentectomy alongside catheter insertion reported no further mechanical or functional complications in those patients.20PubMed Central. Peritoneal Dialysis Catheter Placement in Children: Initial Experience with a “2+1”-Port Laparoscopic-Assisted Technique The tradeoff is a slightly more involved surgery, but for small children whose omentum is almost certain to cause problems, the evidence strongly supports removing it at the outset.
CAPD Versus APD and How the Catheter Fits In
Patients on peritoneal dialysis typically choose between CAPD, in which they manually exchange fluid several times during the day, and APD, in which a machine performs exchanges overnight while they sleep. From a catheter perspective, the hardware is the same; the difference lies in how the catheter is used. APD is popular because it frees up daytime hours, but a Cochrane systematic review comparing the two modalities found that the evidence is too uncertain to declare one better than the other for outcomes like death, hospitalizations, peritonitis, exit-site infections, mechanical complications, or catheter removal.21PubMed Central. Automated peritoneal dialysis versus continuous ambulatory peritoneal dialysis for people with kidney failure Quality of life is similarly unclear from a research standpoint, though in practice many patients prefer APD for lifestyle reasons. The choice between the two should be driven by patient preference, schedule, and clinical circumstances rather than assumed superiority of one over the other.
Beyond Dialysis: Oncology and Palliative Uses
Peritoneal catheters are not just for kidney failure. In oncology, they serve as the delivery system for intraperitoneal chemotherapy, which sends cancer-killing drugs directly into the abdominal cavity to bathe tumors growing on peritoneal surfaces. Hyperthermic intraperitoneal chemotherapy (HIPEC) is a specialized version in which heated chemotherapy is circulated through the abdomen during surgery, aiming to destroy residual cancer cells after the surgeon has removed all visible tumor.22JAMA Oncology. Hyperthermic Intraperitoneal Chemotherapy for Ovarian and Colorectal Cancer: A Review The heat increases drug penetration into tissue and has independent anti-tumor effects. In advanced ovarian cancer, pooled data from nonrandomized HIPEC studies showed five-year survival rates ranging from 35% to 70%, with mortality from the procedure itself ranging from 0% to 5%.23PubMed Central. Intraperitoneal chemotherapy in ovarian cancer: a review of tolerance and efficacy
In palliative care, tunneled peritoneal catheters provide relief for patients with malignant ascites, the painful accumulation of fluid in the abdomen caused by cancer. Repeated trips to the hospital for large-volume paracentesis (needle drainage) are uncomfortable and disruptive. A tunneled catheter like the PleurX allows patients or their caregivers to drain fluid at home as needed. Prospective studies have found this approach to be safe and effective, significantly reducing both ascites-related symptoms and hospitalization rates over extended periods.24PubMed Central. Tunnelled Peritoneal Catheter for Malignant Ascites—An Open-Label, Prospective, Observational Trial Tenckhoff-style tunneled catheters have also been used in this setting, with the added benefit of enabling intraperitoneal chemotherapy through the same access point in patients for whom that treatment is appropriate.25PubMed Central. Tenckhoff tunneled peritoneal catheter placement in the palliative treatment of malignant ascites: technical results and overall clinical outcome
Ventriculoperitoneal Shunts and Pressure Monitoring
In neurosurgery, the peritoneal cavity serves as the drainage site for ventriculoperitoneal (VP) shunts, which divert excess cerebrospinal fluid from the brain’s ventricles in patients with hydrocephalus. The distal end of the shunt, a catheter threaded under the skin from the skull down through the neck and chest, terminates in the peritoneal cavity, where the fluid is absorbed. When a VP shunt fails at its peritoneal end, the question arises whether the peritoneum can still absorb fluid adequately, especially if the patient has had prior peritonitis or abdominal surgery. Peritoneography, in which contrast dye is injected through the catheter to see how it distributes and clears, has been proposed as a way to assess the absorptive potential of the peritoneal cavity before abandoning it as a shunt terminus.26PubMed. Peritoneography in the assessment of peritoneal cerebrospinal fluid absorption potential for distal ventriculoperitoneal shunt catheter placement: technical case report
Peritoneal catheters also appear in research and critical-care settings as tools for directly measuring intra-abdominal pressure. In an experimental study, catheters placed in the peritoneal cavity alongside catheters in the bladder and stomach allowed researchers to compare pressure readings from different sites as abdominal pressure was systematically increased.27PubMed Central. Increasing abdominal pressure with and without PEEP: effects on intra-peritoneal, intra-organ and intra-vascular pressures While bladder pressure remains the standard clinical surrogate for intra-abdominal pressure, direct peritoneal measurement is the reference standard against which other methods are validated.
Antimicrobial Catheters and the Future
Given that infection starts at the catheter surface, the logical next step is building infection resistance into the catheter itself. Researchers have developed silicone peritoneal catheters impregnated with combinations of antimicrobial agents designed to kill bacteria on contact before biofilms can form. One approach uses rifampicin, triclosan, and trimethoprim embedded in the silicone. In laboratory testing, these catheters maintained antimicrobial activity for over 280 days without promoting resistance, killed more than 99.9% of attached bacteria, and resisted repeated high-dose challenges with methicillin-resistant Staphylococcus aureus and E. coli for roughly 90 days in flow models.28PubMed. An antimicrobial modified silicone peritoneal catheter with activity against both Gram-positive and Gram-negative bacteria
An updated formulation swapped trimethoprim for sparfloxacin and is designed specifically to address the broader range of organisms encountered in peritoneal dialysis while extending the protective window to about three months.29PubMed Central. Potential clinical value of catheters impregnated with antimicrobials for the prevention of infections associated with peritoneal dialysis These are promising laboratory results, but the technology has not yet been validated in large human trials. If it translates to real patients, antimicrobial-impregnated catheters could reduce the peritonitis episodes that currently drive many patients off peritoneal dialysis and onto hemodialysis. The gap between lab success and clinical adoption is familiar in medical device development, but the unmet need is large enough that this remains one of the more watched innovations in the peritoneal dialysis world.