"How long can a ureteral stent stay in?" is one of the first questions patients ask after learning they need one placed, whether following a kidney stone procedure, ureteroscopy, or as part of managing a ureteral obstruction. The answer depends on the underlying reason for placement, the stent material, and individual patient factors, so there is no single universal timeframe that applies to every case. Generally speaking, indwelling time is planned by the treating physician and typically falls within a period ranging from a few days to several months, with regular reassessment along the way. This article outlines the general factors that determine stent duration and why timely exchange or removal is an important part of stent management.
What Determines How Long a Stent Remains in Place?
The planned duration for a ureteral stent depends heavily on why it was placed. A stent inserted temporarily after ureteroscopy for stone removal is commonly left in place for a period of days to a few weeks to allow the ureter to heal and reduce swelling, while a stent placed to manage a chronic obstruction — from a stricture, external compression, or malignancy, for example — may be intended for longer-term indwelling use with scheduled exchanges. Physicians also consider the stent material and its manufacturer-stated indications when planning duration, since not all stents are validated for the same maximum indwelling period. Individual anatomy, kidney function, and how well a patient tolerates the stent can also influence whether a physician adjusts the originally planned timeline.
Why Can't a Stent Simply Be Left in Indefinitely?
Ureteral stents are generally not intended for indefinite placement without monitoring, primarily because of a well-established phenomenon called encrustation — the gradual deposit of mineral salts from urine onto the stent surface over time. Encrustation risk is commonly reported to increase the longer a stent remains in place, and in more advanced cases can contribute to stent blockage, difficulty with eventual removal, or new stone formation on the stent itself. Biofilm formation, a layer of bacteria and their byproducts that can develop on any indwelling urinary device, is another reason regular exchange or removal is generally recommended, since biofilm-associated devices carry some elevated risk of urinary tract infection if left far beyond the intended duration. These factors are why physicians typically schedule stent exchange visits proactively rather than waiting for symptoms to develop.
How Often Are Stents Typically Exchanged for Longer-Term Cases?
For patients requiring longer-term stenting, physicians commonly plan periodic exchanges, with intervals often discussed in terms of months rather than years, though the exact schedule is individualized based on the stent product used and the patient's clinical situation. During an exchange, the existing stent is removed, typically via cystoscopy, and a new stent is placed in the same visit if continued drainage is still needed. Missing a scheduled exchange date is generally discouraged, since it extends indwelling time beyond what was clinically planned and can increase encrustation or infection risk. Patients are encouraged to keep track of their stent placement date and any physician-provided exchange schedule, and to contact their urology provider if an appointment needs to be rescheduled rather than skipped entirely.
Stent Material Considerations Relevant to Duration
Stent composition and surface treatment are factors physicians may weigh when planning for longer indwelling periods. The UroFlow Ureteral Stents manufactured by INVAMED are made from polyurethane (PUR), with an optional phosphorylcholine (PC) surface coating that the manufacturer describes as intended to help address encrustation and support use over extended indwelling periods. Material choice is one of several variables — alongside patient anatomy and the underlying urologic condition — that a physician factors into an individualized stenting plan. Additional information on ureteral stents is available on the UroFlow Ureteral Stents product page, and the broader device category can be reviewed on the urology and incontinence management page.
Does a longer indwelling time mean more discomfort?
Not necessarily, though many patients report some initial adjustment period regardless of planned duration. Comfort is influenced by factors such as stent position, bladder sensitivity, and individual anatomy in addition to how long the stent has been in place, and any new or worsening symptoms should be discussed with the treating physician.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.