Eustachian Catheter

What it is

The Eustachian catheter is a slender, curved stainless steel instrument with a characteristic anatomical distal curvature (the Hartmann curve) that allows it to pass through the nasal cavity, around the posterior choanae, and into the Eustachian tube orifice in the nasopharynx. The proximal end accepts a Politzer bag or compressed air source for controlled insufflation. It is available in five sizes corresponding to paediatric through adult anatomy.

When & how it's used

Eustachian tube catheterisation is used for diagnostic middle ear inflation to confirm or restore Eustachian tube patency, and therapeutically in patients with Eustachian tube dysfunction, glue ear (otitis media with effusion), and chronic negative middle ear pressure. It provides more targeted and controllable air delivery than the Valsalva manoeuvre or Politzer technique, and allows the clinician to auscultate the ear during insufflation to confirm air entry.

Eustachian tube catheterisation is a technique with a long history in otology, and the Eustachian catheter remains a valuable tool in the assessment and management of middle ear ventilation disorders. The procedure involves passing the catheter transnasally — following the floor of the nasal cavity — then rotating it medially to engage the Eustachian tube orifice in the nasopharynx. Gentle insufflation with a Politzer bag or air syringe is then performed while the clinician listens through a Toynbee tube or stethoscope placed over the patient’s ear to detect air entering the middle ear space. A crisp rush of air confirms tube patency; absence of this sound, or a wet bubbling quality, suggests dysfunction or fluid in the middle ear.

Size selection is based on patient age and nasopharyngeal anatomy. Sizes 1 and 2 are used in young and older children respectively, where the nasopharyngeal dimensions and Eustachian tube angle are smaller. Sizes 4 and 5 are standard for adults. Using too large a catheter risks trauma to the mucosa; too small a catheter may fail to seal adequately at the tube orifice. The Hartmann curvature of the distal tip is a clinically important design feature — it replicates the anatomical relationship between the nasal floor and the Eustachian tube orifice, guiding the catheter into position with minimal manipulation.

Design features

• Hartmann distal curvature: Anatomically shaped curve at the catheter tip that follows the natural path from the nasal floor to the Eustachian tube orifice in the nasopharynx.
• Five sizes: Covers the full range from young paediatric to large adult anatomy, ensuring appropriate fit for every patient.
• Proximal Luer or olive fitting: Accepts a Politzer bag, air syringe, or other insufflation source at the proximal end.
• Stainless steel construction: Provides the rigidity needed to navigate the nasal cavity and nasopharynx without flexing; autoclavable.
• Smooth tip: Atraumatic distal tip minimises mucosal trauma during insertion and positioning.

Frequently Asked Questions

How is the correct size Eustachian catheter selected? Size selection is based primarily on patient age: size 1 for young children, size 2 for older children, size 3 for adolescents, and sizes 4–5 for adults with varying nasopharyngeal anatomy. In practice, clinicians often keep sizes 3, 4, and 5 for adult use and sizes 1 and 2 for paediatric lists.

What is the difference between Eustachian tube catheterisation and the Politzer technique? The Politzer technique delivers air into the nasopharynx via a nostril while the patient swallows, relying on natural nasopharyngeal closure to direct air into the Eustachian tube. Catheterisation places the catheter directly at the tube orifice, providing more targeted, controlled, and audibly confirmable air delivery. Catheterisation is more technically demanding but yields more reliable results in dysfunctional tubes.

Can Eustachian tube catheterisation be performed without anaesthesia? In cooperative adults, it can be performed under topical nasal mucosal anaesthesia. In children, or in patients with an active gag reflex or anxiety, light sedation or general anaesthesia may be required. The nasal cavity should always be decongested with a topical vasoconstrictor prior to the procedure.

What does auscultation during insufflation reveal? A clear rushing sound heard through the Toynbee tube indicates patent Eustachian tube function. A bubbling or crackling sound suggests middle ear fluid (glue ear). Silence suggests a blocked or severely dysfunctional tube. These findings guide further management including myringotomy and ventilation tube insertion.