Montgomery T-Tube

What It Is

The Montgomery T-tube (also called the "Safe-T-Tube") is a silicone, T-shaped airway stent that functions simultaneously as a tracheal stent and a tracheostomy tube. It is a modification of a standard tracheostomy tube but has no inner cannula. The "T" shape consists of:

Upper (vertical) limb - extends superiorly through the subglottis/stenotic segment toward the glottis
Lower (vertical) limb - extends inferiorly in the trachea
Horizontal (external) limb - exits through the tracheostomy stoma for access, suctioning, and ventilation

The diagram below illustrates the T-tube positioned in the trachea with the horizontal limb exiting through the tracheostomy:

Material & Design

Made of implant-grade silicone - soft, pliable, and non-adherent smooth surface
Available in clear or radiopaque material
MRI-safe
Comes in multiple series: Pediatric, Standard, Thoracic, Extra-Long, and Tapered
A safety ring-and-groove system secures a plug to cap the external limb, allowing the patient to breathe and speak normally via the upper airway when plugged

Indications

The T-tube is used in benign and malignant tracheal/laryngotracheal disease:

Category	Examples
Acute airway trauma	Blunt laryngotracheal injury
Tracheal/subglottic stenosis	Post-intubation, post-tracheostomy stenosis
Reconstructed/reconstituted trachea	After segmental resection and anastomosis
Stenosis not amenable to surgery	Long-segment stenosis, poor surgical candidates
Combined laryngotracheal stenosis	After simultaneous glottis + subglottis repair
Cervical trachea defects	When the cervical trachea cannot be repaired or reconstructed

It is most commonly used for subglottic and upper tracheal stenosis and serves as an alternative to a solid stent when phonation is desired - the hollow lumen allows air passage to the vocal cords when the external limb is plugged. - Cummings Otolaryngology, p. 1217

As the Tintinalli's Emergency Medicine textbook notes: "The mainstay of treatment for symptomatic tracheal stenosis is surgical resection and anastomosis. When surgical treatment is not possible, the option exists for insertion of airway stents as a bridge to surgery, as a treatment for patients who are not surgical candidates, and in cases where there is a long segment of stenosis."

Contraindications

Aspiration by the patient (risk of material entering the lung through the stent)
Patients requiring positive pressure-assisted respiration (the T-tube is not compatible with standard mechanical ventilation via the tracheal route without special adaptors)

Advantages Over Solid Stents

Feature	Solid Stent	Montgomery T-tube
Phonation	No	Yes (when external limb plugged)
Endotracheal intubation from above	Possible (through lumen)	Possible (through lumen)
Tracheostomy dependency	Yes (stent blocks airway above stoma)	No - upper limb patent
Suctioning access	Limited	Both limbs accessible

Placement

Inserted by an ENT or thoracic surgeon experienced with the device
Placed under general anesthesia, typically with rigid bronchoscopy or direct laryngoscopy
The external limb is plugged with the provided ring/plug system when the patient breathes spontaneously through the upper airway
For anesthesia: a balloon catheter is used to occlude the upper end of the T-tube to create a closed system for ventilation

Nursing & Post-Operative Care

Humidification and regular suctioning of both upper and lower limbs are essential - mucous plugging and crusting are the most common complications - Tintinalli's, Ch. 247
Daily saline nebulizers are prescribed
Carbocysteine may be added if mucus plugging is problematic
The patient must be educated about the single-lumen design and its inherent higher risk of obstruction compared to double-cannula tubes

Complications

Early (perioperative)

Postoperative fever
Bleeding
Excessive mucus secretion
Irritating cough
Short-term dyspnea

Late (long-term)

Granulation tissue formation - most common at the upper edge, often due to friction from tube displacement during swallowing or speaking
Mucous plugging / obstruction - from impaired expectoration
Secondary infection / microbial colonization
Tube dislodgement - migration from coughing or swallowing
Ischemic mucosal injury - if pressure on mucosa exceeds 20-40 mmHg capillary pressure

Emergency Management of T-Tube Obstruction

Suction both the upper and lower vertical limbs
If obstruction persists after suctioning - remove the entire T-tube
Re-establish airway via tracheostomy with an appropriately sized tracheostomy tube or endotracheal tube
Do NOT attempt to pass an endotracheal tube blindly if the T-tube is still in situ
Consult specialist (ENT/thoracic surgery) for re-insertion - Tintinalli's Emergency Medicine, Ch. 247

Relationship to Other Tracheal Stents

The Dumon tube is the other most commonly used silicone stent. Unlike the Montgomery T-tube, the Dumon is secured endoluminally via external studs and also has bronchial versions. The T-tube's unique advantage is its external access limb and the ability to support phonation.

A stent can also be fashioned from just the vertical limb of a T-tube (oversewn at the top, secured with a suture through the anterior commissure), used specifically as an endolaryngeal stent for laryngeal injuries - Cummings Otolaryngology, p. 1201; Scott-Brown's Otorhinolaryngology, Ch. 76.

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