Similarities and differences between Gel-like laryngeal masks and conventional inflatable silicone laryngeal masks

Laryngeal mask is a core device for supraglottic airway management and serves as indispensable, standardized equipment in modern anesthesia, emergency medicine, and critical care. Both Gel-like laryngeal masks and standard inflatable silicone laryngeal masks are classified as second-generation supraglottic airway devices (SADs); they are used to establish non-invasive ventilation pathways—serving as alternatives to tracheal intubation—during general anesthesia, pre-hospital emergency care, and cardiopulmonary resuscitation.

  

1. Identical Core Safety Structure

Mainstream models feature a dual-channel, separated design: a large ventilation lumen and an independent gastric drainage lumen. The latter allows for the insertion of a gastric tube to aspirate gastric contents, thereby reducing the risk of reflux and aspiration. An integrated bite block prevents the patient from biting down and occluding the airway, while a standardized 15mm proximal connector ensures compatibility with manual resuscitators and anesthesia circuits.

 

2. Comprehensive Patient Coverage

Available in a wide range of sizes to accommodate neonates, pediatric patients, adults, and bariatric patients; supports both spontaneous breathing and positive-pressure mechanical ventilation.

 

3. Consistent Clinical Utility

Allows for blind insertion without the need for a laryngoscope; the procedure is simple and causes significantly less irritation to the pharynx and vocal cords compared to tracheal intubation. It maintains stable oxygenation during surgery and serves as a reliable backup ventilation option for difficult airways.

 

4. Sterilization and Usage Specifications 
Mainstream products are designed for single use and sterilized via ethylene oxide (no reusable models); all feature latex-free formulations to eliminate the risk of latex allergies.

 

1. Material and structure of the sealing capsule

 

- Cuff Sealing Material: Gel-like laryngeal masks utilize medical-grade SEBS thermoplastic gel, featuring a soft, integrated cuff with low Shore hardness and a soft, gel-like feel; standard inflatable silicone laryngeal masks utilize a medical-grade silicone elastic cuff with a hollow, inflatable chamber structure.

 
- Inflation Design: Gel-like laryngeal masks have no inflatable cuff, inflation tube, or pilot balloon; standard inflatable silicone laryngeal masks feature an inflation tube and pilot balloon, requiring inflation to achieve a seal.
- Sealing mechanism: Gel-like laryngeal masks utilize a gel that conforms to the pharyngeal anatomy upon warming to body temperature, achieving a seal through material deformation; conventional inflatable silicone laryngeal masks rely on air inflation to expand the cuff, compressing pharyngeal soft tissues to create a seal.

 
- Tube material: Gel-like laryngeal masks feature a rigid, modified TPE tube formed as a single unit with a pre-set anatomical curve; conventional inflatable silicone laryngeal masks use a soft silicone tube that is prone to flattening when bent and offers poor anatomical fit.

2. Differences in Clinical Procedures

 

- Gel-like Laryngeal Mask Airway (LMA)
Can be inserted immediately upon removal from the package, eliminating the need for cuff inflation and pressure monitoring. It facilitates faster insertion by a single rescuer—reducing the average insertion time by approximately 10 seconds—and requires less training, making it suitable for emergency medicine and out-of-hospital resuscitation.

 
- Inflatable Silicone LMA
Requires inflation based on body weight standards after insertion and periodic monitoring of cuff pressure during the procedure (maintaining it at 20–30 cmH₂O). When nitrous oxide is used for anesthesia, the gas diffuses into the cuff, causing continuous pressure elevation; this necessitates repeated deflation to adjust the pressure, resulting in a cumbersome procedure.

 

3. Airway Injury and Postoperative Complications

 

- Advantages of Gel-Cuff Laryngeal Masks
The gel cuff exerts uniform, gentle pressure without causing localized high-pressure compression; the incidence rates of postoperative sore throat, hoarseness, pharyngeal mucosal congestion, and recurrent laryngeal nerve compression are lower (only 5%–8%).

 
- Drawbacks of Inflatable Laryngeal Masks
Improper control of cuff pressure easily leads to localized high pressure; patient repositioning or changes in body position cause the cuff to compress the mucosa; accumulation of nitrous oxide increases cuff pressure and exacerbates pharyngeal injury; the incidence rate of postoperative pharyngeal discomfort is 10%–15%.

 

4. Sealing Performance and Positional Stability

 

- Inflatable silicone laryngeal mask: The cuff inflation volume can be adjusted to fine-tune the seal pressure; it offers slightly better leak control in cases of extreme intra-abdominal hypertension or in obese patients. However, the cuff is prone to displacement and leakage during patient repositioning (e.g., turning to prone or lateral positions) during surgery.

 
- Gel-like laryngeal mask: Provides a stable seal pressure of 20–26 cmH₂O, meeting the ventilation requirements for the vast majority of surgeries. Its anti-rotation gel-wing design ensures it is less likely to dislodge or leak during intraoperative repositioning or long-distance transport, offering superior positional stability.

 

5. Primary Use Cases

 

- Gel-like laryngeal masks are preferred for: pre-hospital emergency care, cardiopulmonary resuscitation (CPR), short-term ventilation in the ICU, minor pediatric surgeries, outpatient/day-case anesthesia, surgeries performed in the prone position, and stockpiling for mass-casualty emergencies.

 
- Inflatable silicone laryngeal masks are preferred for: prolonged high-pressure laparoscopic surgeries, morbidly obese patients, surgeries involving high intra-abdominal pressure, and general anesthesia procedures requiring an exceptionally tight airway seal.

 

6. Respective Limitations

 

- Limitations of Gel-like laryngeal masks: The gel has fixed firmness, preventing fine-tuning of the seal; fit is suboptimal in patients with extreme anatomical abnormalities of the pharynx; the internal diameter of the ventilation lumen is relatively small, making it difficult to pass large-bore tracheal tubes directly.

 
- Limitations of inflatable silicone laryngeal masks: They involve multiple procedural steps, resulting in lower efficiency during emergency care; cuff pressure management is complex; prolonged compression poses a risk of mucosal injury; and frequent pressure adjustments are required when using nitrous oxide.