Introduction
Safe and effective bladder drainage is an important aspect of care for many hospitalized and outpatient patients. Urinary catheters may become essential in conditions such as urinary retention, certain neurological disorders, spinal cord injuries, urological procedures, or situations in which a patient is unable to empty the bladder naturally.
Among the different types of urinary catheters, the Nelaton catheter is one of the most widely used single-use catheters in healthcare facilities because of its simple design, suitable flexibility, and broad range of applications. It is designed for temporary bladder drainage and, unlike a Foley catheter, has no retention balloon. It is therefore removed after the bladder has been emptied and is not intended for indwelling or long-term use.
Nelaton catheters are widely used in hospitals, operating rooms, emergency departments, rehabilitation centers, specialist clinics, and by certain patients who require intermittent catheterization. Selecting the correct size, following appropriate aseptic practices, and using a high-quality product are important for reducing the risk of urinary tract infection, urethral injury, and other complications.
This article explains the structure, applications, types, sizes, standard color coding, potential complications, and relevant manufacturing standards of Nelaton catheters. It also discusses the differences between Nelaton catheters and other urinary catheters and outlines important considerations for their selection and use.
What Is a Nelaton Catheter?
A Nelaton catheter is a sterile, flexible, single-use, non-balloon urinary catheter used for temporary drainage of urine from the bladder or for collecting a sterile urine specimen. It is inserted through the urethra into the bladder and removed once the bladder has been emptied.
The catheter is named after Auguste Nélaton, a prominent nineteenth-century French surgeon who contributed to the development of surgical and medical instruments.
Unlike a Foley catheter, which contains a balloon and is designed to remain in the bladder, a Nelaton catheter has no retention mechanism. It is therefore primarily used when temporary or intermittent bladder drainage is required.
Nelaton catheters are commonly made of medical-grade PVC, although some models are manufactured from polyurethane or silicone. These materials provide suitable flexibility and adequate mechanical strength, allowing the catheter to pass through the urethra while minimizing tissue trauma.
A Nelaton catheter typically has one or two side eyes near its distal end through which urine enters the catheter. Its smooth, rounded tip is designed to minimize the risk of injury to the urethral mucosa.
Main Components of a Nelaton Catheter
Although a Nelaton catheter has a relatively simple structure, each component is designed to support safe and effective use.
Catheter Shaft
The catheter shaft is a flexible, hollow tube that allows urine to flow from the bladder to the outside of the body. Its external diameter is specified using the French scale (Fr or Ch), and Nelaton catheters are manufactured in a range of sizes.
Rounded Tip
The distal tip of a Nelaton catheter is smooth and rounded to reduce friction and minimize trauma during passage through the urethra.
Side Eyes
One or two side openings are positioned near the catheter tip to allow urine to enter the lumen. Properly finished side eyes help support smooth and effective bladder drainage.
Proximal Connector
The proximal end of the catheter is fitted with a color-coded connector. In addition to facilitating connection to compatible equipment, the connector color helps identify the catheter size according to the applicable international color-coding system.
Features of a Nelaton Catheter
The simple and practical design of the Nelaton catheter provides several important features:
- Sterile and ready for use
- Intended for single use
- No retention balloon
- Suitable flexibility to reduce urethral trauma
- Smooth surface for easier passage
- Rounded, atraumatic tip
- Available in different sizes for neonates, children, and adults
- Color-coded connector corresponding to the French size
- Suitable for temporary bladder drainage and sterile urine specimen collection
How Does a Nelaton Catheter Work?
A Nelaton catheter works by creating a temporary pathway through which urine can drain from the bladder.
After the catheter is passed through the urethra and its tip reaches the bladder, urine enters the catheter through the side eyes. It then flows through the lumen and exits through the proximal end as a result of the pressure difference and gravity.
Because the Nelaton catheter has no balloon, it is gently removed by a healthcare professional—or by an appropriately trained patient during intermittent self-catheterization—after bladder drainage is complete.
As it does not remain in the bladder, it avoids complications specifically associated with prolonged indwelling catheterization, such as encrustation, catheter blockage, and the increased infection risk associated with extended catheter dwell time.
The Nelaton catheter is therefore suitable for intermittent catheterization and a range of short-term diagnostic and therapeutic procedures.
Applications of the Nelaton Catheter
The Nelaton catheter is one of the most commonly used urinary catheters in healthcare facilities and may be used for various diagnostic and therapeutic purposes. Its simple design, suitable flexibility, and short-term use make it an appropriate option for temporary bladder drainage and certain medical procedures.
The decision to use a Nelaton catheter should be based on the patient’s clinical condition, the expected duration of catheterization, the intended purpose, and the clinician’s judgment.
Its main applications include the following:
1. Temporary Bladder Drainage
The primary application of a Nelaton catheter is temporary drainage of urine from the bladder.
Some patients are unable to empty their bladder naturally. Accumulated urine can cause pain, bladder distension, kidney injury, and an increased risk of infection. In appropriate clinical circumstances, a Nelaton catheter creates a temporary drainage pathway and allows the bladder to be emptied.
Urinary retention may be associated with conditions such as:
- Acute urinary retention
- Chronic urinary retention
- Prostatic enlargement
- Urethral narrowing or obstruction
- Neurogenic bladder dysfunction
- Adverse effects of certain medications
- Postoperative urinary retention
Because a Nelaton catheter is removed after drainage, it does not expose the patient to the risks associated with leaving a catheter in the bladder for an extended period.
2. Collection of a Sterile Urine Specimen
Another important application of the Nelaton catheter is the collection of a urine specimen for diagnostic testing when catheterized sampling is clinically indicated.
A naturally voided urine specimen may sometimes be contaminated by bacteria from the skin or genital area, potentially affecting test results. Catheterized urine collection can provide a specimen with a lower risk of external contamination when performed correctly and may be appropriate when more controlled sampling is required.
3. Use in the Operating Room
Nelaton catheters may also be used during certain surgical procedures.
For some short procedures, emptying the bladder before surgery may improve surgical access and help reduce the risk of inadvertent bladder injury. A Nelaton catheter may also be used after certain procedures to confirm that the bladder has been emptied.
4. Use in the Emergency Department
Rapid clinical assessment is essential in emergency care. Following appropriate evaluation, a Nelaton catheter may be used for temporary bladder drainage in situations such as acute urinary retention, reduced consciousness, or certain acute medical conditions.
Prompt bladder drainage may improve patient comfort and assist with clinical assessment. In trauma cases, however, possible urethral injury must be considered before urethral catheterization is attempted.
5. Use in Patients With Neurological Disorders
Patients with spinal cord injury, multiple sclerosis, spina bifida, or other neurological conditions may lose the ability to empty their bladder completely.
For many of these patients, clinicians may recommend clean intermittent catheterization (CIC). In this method, the patient or a trained caregiver inserts a suitable intermittent catheter at scheduled intervals to empty the bladder and then removes it.
When clinically appropriate and correctly performed, intermittent catheterization may reduce the risk of certain complications compared with continuous use of an indwelling catheter.
6. Use in Intensive Care Units
Some patients in intensive care, particularly those with reduced consciousness or limited mobility, may occasionally require temporary bladder drainage.
The clinician must determine whether intermittent drainage with a Nelaton catheter is appropriate or whether an indwelling catheter, such as a Foley catheter, is necessary for the patient’s condition.
7. Use in Children and Neonates
Nelaton catheters are manufactured in small sizes suitable for children and neonates.
In pediatric units, neonatal intensive care units, and pediatric intensive care units, these catheters may be used for:
- Temporary bladder drainage
- Catheterized urine specimen collection
- Assessment of urinary tract function
- Certain diagnostic and therapeutic procedures
Because pediatric urinary tissues are particularly delicate, selecting the correct catheter size and following proper catheterization technique are especially important.
8. Use in Female and Male Patients
Nelaton catheters may be used in both female and male patients.
However, the male urethra is longer than the female urethra. This anatomical difference must be considered when selecting the appropriate catheter length and performing catheterization.
Benefits of Nelaton Catheters for Short-Term Use
When only temporary bladder drainage is required, a Nelaton catheter may offer several advantages:
- Rapid and effective bladder drainage
- No need for the catheter to remain in the body
- Reduced post-procedure discomfort after removal
- Suitable for intermittent catheterization
- Can be used for catheterized urine specimen collection
- Straightforward use by trained healthcare personnel
- Available in different sizes for various age groups
Types of Nelaton Catheters
Although the general design of Nelaton catheters is similar across models, they are available in different sizes, lengths, materials, and age-specific configurations to meet the needs of different patients and healthcare settings.
The appropriate type should be selected according to the patient’s age, sex, clinical condition, intended use, and the clinician’s judgment.
The main classifications are as follows:
1. Nelaton Catheters by French Size
The most common method of classifying Nelaton catheters is the French scale (Fr or Ch). This scale indicates the catheter’s external diameter: the higher the French number, the larger the catheter diameter.
Correct size selection is important. A catheter that is unnecessarily large may increase discomfort and the risk of urethral trauma, while a catheter that is too small may result in slow or ineffective drainage.
Common Nelaton Catheter Sizes
| Size (Fr) | Standard Connector Color | Common Application |
|---|---|---|
| 6 Fr | Light green | Neonates and infants |
| 8 Fr | Blue | Children |
| 10 Fr | Black | Older children and adolescents |
| 12 Fr | White | Smaller adults |
| 14 Fr | Green | One of the commonly used adult sizes |
| 16 Fr | Orange | Adults |
| 18 Fr | Red | Situations requiring a larger drainage lumen |
| 20 Fr | Yellow | Selected clinical indications under medical supervision |
| 22 Fr | Violet | Limited or specialist applications |
| 24 Fr | Dark blue | Selected urological applications |
Note: Connector color coding should be verified against the applicable standard and the manufacturer’s documentation. Minor differences may exist between products or markets.
2. Nelaton Catheters by Age Group
Nelaton catheters are manufactured for different age groups.
Neonatal Nelaton Catheters
These catheters have a very small diameter and a soft shaft suitable for neonatal and infant use.
Pediatric Nelaton Catheters
Smaller-diameter catheters are used in pediatric, NICU, and PICU settings to reduce the risk of urethral trauma.
Adult Nelaton Catheters
Commonly used adult sizes are often within the 12 to 16 Fr range, although the final selection must be based on the patient’s anatomy, clinical condition, and the clinician’s judgment.
3. Nelaton Catheters by Material
Nelaton catheters may be manufactured from different materials, each with specific characteristics.
Medical-Grade PVC
Medical-grade PVC is commonly used to manufacture Nelaton catheters.
Its potential characteristics include:
- Suitable flexibility
- Adequate mechanical strength
- Cost-effective manufacturing
- Smooth surface
- Suitability for single-use products
Silicone
Some specialized models are made of silicone, which may provide greater flexibility and biocompatibility. These products may also be more expensive to manufacture.
Polyurethane
Polyurethane may be used for certain specialized products because it can provide an appropriate combination of mechanical strength and flexibility.
4. Nelaton Catheters by Length
Catheter length varies according to the intended patient group and application.
In general:
- Pediatric catheters are shorter.
- Adult catheters are longer.
- Some models are specifically designed for male or female anatomy.
How Is the Appropriate Nelaton Catheter Size Selected?
The appropriate catheter size should be selected by a clinician or trained healthcare professional according to the patient’s clinical condition.
Relevant factors include:
- Patient age
- Sex
- Urethral anatomy
- Purpose of catheterization
- Presence of urethral narrowing, obstruction, or injury
- Underlying medical conditions
- Overall clinical status
In general, the smallest catheter size that provides effective drainage should be selected. This approach may reduce urethral trauma and patient discomfort.
Difference Between a Nelaton Catheter and a Foley Catheter
Nelaton and Foley catheters are both widely used urinary catheters, but they differ significantly in design, duration of use, and clinical application.
The choice between them depends on factors such as the patient’s condition, the required duration of bladder drainage, the underlying disorder, and the clinician’s judgment.
Nelaton Catheter
A Nelaton catheter is a sterile, single-use, non-balloon catheter designed for temporary bladder drainage. After the catheter enters the bladder and drainage is complete, it is removed. It is not intended to remain in the bladder or be reused.
Nelaton catheters are commonly used for intermittent catheterization, catheterized urine specimen collection, diagnostic procedures, and certain short-duration surgical applications.
Foley Catheter
A Foley catheter is an indwelling urinary catheter with a retention balloon near its distal end. After the catheter enters the bladder, the balloon is inflated with the volume and fluid specified by the manufacturer to retain the catheter in position.
Foley catheters are used when continuous bladder drainage is clinically required, such as in selected intensive care patients, during or after certain surgical procedures, or in patients with severe urinary dysfunction.
Comparison of Nelaton and Foley Catheters
| Feature | Nelaton Catheter | Foley Catheter |
|---|---|---|
| Duration of use | Temporary and short-term | Short-term or longer-term, as clinically indicated |
| Retention balloon | No | Yes |
| Remains in the bladder | No | Yes |
| Primary application | Temporary bladder drainage and catheterized urine sampling | Continuous bladder drainage |
| Common settings | Emergency care, operating rooms, clinics, and intermittent catheterization | Intensive care, inpatient care, perioperative care, and other indications requiring continuous drainage |
| Infection risk | Generally lower when used correctly and removed promptly | Increases with prolonged indwelling use |
| Patient considerations | Suitable when only temporary drainage is required | Suitable when continuous drainage is clinically necessary |
| Reusable | No | No; duration of use must follow clinical guidance and the manufacturer’s instructions |
When Is a Nelaton Catheter Used?
Clinicians may select a Nelaton catheter in situations such as:
- Temporary bladder drainage
- Acute urinary retention, following appropriate assessment
- Catheterized urine specimen collection
- Intermittent catheterization
- Certain diagnostic or therapeutic procedures
- Selected short-duration surgical procedures
The absence of a balloon allows the catheter to be removed after the procedure, eliminating the need for it to remain in the bladder.
When Is a Foley Catheter More Appropriate?
A Foley catheter may be selected when continuous urine drainage is clinically required, including in circumstances such as:
- Selected cases of prolonged hospitalization
- Intensive care
- Certain major surgical procedures
- Accurate monitoring of urine output in appropriately selected patients
- Certain severe bladder-emptying disorders
In these situations, the retention balloon helps prevent unintentional catheter displacement and enables continuous urine drainage.
Can a Nelaton Catheter Replace a Foley Catheter?
No. Nelaton and Foley catheters are designed for different clinical purposes, and the choice between them must be based on the patient’s condition and the clinician’s judgment.
Using a Nelaton catheter when continuous drainage is required, or using an indwelling Foley catheter when temporary drainage is sufficient, may be inappropriate.
Each catheter therefore has a defined role in patient care. Correct selection can help improve patient safety, reduce complications, and support better clinical outcomes.
Advantages of the Nelaton Catheter
Because of its simple design, ease of use, and suitability for short-term bladder drainage, the Nelaton catheter is widely used in hospitals and other healthcare settings.
Its principal advantages include the following:
1. Suitable for Temporary Bladder Drainage
One of the main advantages of the Nelaton catheter is that it is designed for short-term catheterization. After the bladder has been emptied, the catheter is removed and does not need to remain in place.
This can improve patient comfort after the procedure and avoids the restrictions associated with an indwelling urinary catheter.
2. Potentially Lower Infection Risk Than Indwelling Catheters
Any foreign object that remains in the body can create conditions that support microbial colonization. Because a Nelaton catheter remains in the bladder only briefly, correctly performed intermittent catheterization may carry a lower infection risk than prolonged indwelling catheterization.
However, no urinary catheter is completely risk-free. Hand hygiene, appropriate catheterization technique, suitable equipment, and adherence to infection-prevention procedures remain essential.
3. Simple Design and Straightforward Use
The Nelaton catheter has a simple structure and contains no balloon, inflation valve, or other mechanical retention components. This makes it relatively straightforward for trained healthcare professionals to use.
Patients who have received appropriate assessment and training may also use a suitable catheter for clean intermittent self-catheterization.
4. Design Intended to Reduce Urethral Trauma
The rounded tip and smooth catheter surface are designed to minimize friction against the urethral wall. When the correct size and technique are used, these features may reduce mucosal trauma, pain, and bleeding.
5. Available in a Wide Range of Sizes
Nelaton catheters are produced in various sizes suitable for different age groups, from neonates to adults.
This range allows clinicians to choose a catheter appropriate for the patient’s anatomy and clinical needs.
6. Suitable for Catheterized Urine Specimen Collection
In certain clinical situations, a urine specimen with minimal external contamination may be required. When clinically indicated and performed correctly, a Nelaton catheter can be used to collect a catheterized specimen and may improve the reliability of certain diagnostic tests.
7. Cost-Effective Design
Because of its simple construction and single-use design, the Nelaton catheter may be a cost-effective option for many healthcare facilities.
Nevertheless, product quality, manufacturing standards, sterility, and safety should take priority over price alone.
Limitations of the Nelaton Catheter
Despite its advantages, a Nelaton catheter is not suitable for every patient or clinical situation.
1. Not Intended for Indwelling Use
The main limitation of a Nelaton catheter is the absence of a retention balloon. It must be removed after bladder drainage and is unsuitable for patients who require continuous urine drainage.
In these circumstances, the clinician may consider an indwelling catheter such as a Foley catheter.
2. Need for Repeated Catheterization
Patients who cannot empty their bladder naturally may need intermittent catheterization at scheduled intervals.
This requires appropriate training, careful hygiene, and cooperation from the patient or caregiver.
3. Risk of Injury if Used Incorrectly
Using an inappropriate size, applying excessive force, or performing catheterization incorrectly can cause urethral injury, bleeding, or the creation of a false passage.
Catheterization should therefore be performed by trained personnel or by patients and caregivers who have received appropriate clinical instruction.
4. Risk of Infection if Proper Technique Is Not Followed
Although intermittent catheterization may reduce some risks associated with indwelling catheters, poor hand hygiene, inappropriate technique, use of a nonsterile or compromised product, or contamination of the catheter may increase the risk of urinary tract infection.
Correct Selection Is More Important Than Catheter Type Alone
No single urinary catheter is the best option for every patient. The choice between a Nelaton catheter, Foley catheter, or another urinary catheter must be based on the patient’s clinical condition, the required duration of catheterization, infection risk, and the clinician’s judgment.
In addition to product quality, correct size selection, proper catheterization technique, and appropriate infection-prevention measures play important roles in achieving successful drainage and reducing complications.
Important Considerations When Selecting and Using a Nelaton Catheter
Correct selection and use of a Nelaton catheter are important for reducing complications and improving patient safety.
Factors such as catheter size, sterility, material quality, product integrity, intended use, and compliance with applicable manufacturing requirements should be considered.
Appropriate catheterization technique, suitable lubrication when required, and performance of the procedure by trained individuals can help reduce urethral trauma and urinary tract infection.
Because the Nelaton catheter is a single-use medical device, it must be discarded after use in accordance with the healthcare facility’s medical-waste procedures. It must not be reused.
Potential Complications of Nelaton Catheter Use
When used correctly, a Nelaton catheter can provide safe and effective temporary bladder drainage. Nevertheless, incorrect use may be associated with complications such as:
- Urinary tract infection
- Irritation or injury of the urethral mucosa
- Pain or discomfort during catheterization
- Minor bleeding caused by mucosal trauma
- Bladder spasm in some patients
- Creation of a false passage in the event of traumatic insertion
Appropriate infection-prevention measures, selection of the correct size, suitable lubrication, gentle technique, and use of an intact sterile catheter are important for reducing these risks.
Important Standards for Nelaton Catheter Manufacturing
As a medical device, a Nelaton catheter should be manufactured in accordance with applicable regulatory requirements and recognized standards.
Relevant standards and regulations may include:
- ISO 13485:2016 — Medical devices — Quality management systems — Requirements for regulatory purposes
- ISO 20696:2018 — Sterile urethral catheters for single use
- Regulation (EU) 2017/745 — European Union Medical Device Regulation
- ISO 10993 series — Biological evaluation of medical devices
Compliance with applicable standards and regulatory requirements supports appropriate control of product design, manufacturing, quality, sterility, biocompatibility, and traceability.
Conclusion
The Nelaton catheter is a widely used urinary catheter designed primarily for temporary bladder drainage and catheterized urine specimen collection. Its simple structure, suitable flexibility, ease of use, and availability in multiple sizes have made it useful in hospitals, clinics, operating rooms, emergency departments, rehabilitation settings, and selected intensive care applications.
Safe and effective use depends on correct size selection, appropriate patient assessment, proper infection-prevention practices, use of a high-quality sterile product, and adherence to clinical guidance.
The catheter type should always be selected according to the patient’s clinical condition and the clinician’s judgment to achieve appropriate drainage while minimizing avoidable complications.
References
- World Health Organization (WHO). Medical Devices Technical Series.
- Centers for Disease Control and Prevention (CDC). Guideline for Prevention of Catheter-Associated Urinary Tract Infections (CAUTI).
- European Association of Urology (EAU). EAU Guidelines on Urological Infections.
- American Urological Association (AUA). Clinical Guidance on Urinary Catheterization.
- National Institute for Health and Care Excellence (NICE). Healthcare-Associated Infections: Prevention and Control.
- National Health Service (NHS). Urinary Catheterisation Clinical Guidelines.
- ISO 13485:2016. Medical Devices — Quality Management Systems — Requirements for Regulatory Purposes.
- ISO 20696:2018. Sterile Urethral Catheters for Single Use.
- ISO 10993 Series. Biological Evaluation of Medical Devices.
- Regulation (EU) 2017/745 on Medical Devices.
