Standard Nasal Cannula
The standard nasal cannula is a lightweight, non-invasive medical device designed to deliver low-concentration supplemental oxygen to patients with mild to moderate hypoxia. It is one of the most widely used oxygen delivery tools in clinical (hospitals, clinics) and home care settings, valued for its simplicity, comfort, and ability to allow patients to perform daily activities like eating and speaking.
1. Core Design & Components
The device features a minimalist, patient-friendly structure that balances functionality and comfort, consisting of four key parts:
- Nasal Prongs: Two soft, curved tips (usually made of PVC or silicone) that insert gently into the patient's nostrils. Their size is standardized to fit most adult, pediatric, or neonatal nasal cavities, ensuring oxygen is directed toward the airway without irritation.
- Oxygen Tubing: A flexible, transparent tube (typically 1.5-2 meters long, 4mm inner diameter) that connects the prongs to an oxygen source (e.g., oxygen concentrator, cylinder). The transparency allows easy checks for kinks, blockages, or moisture buildup.
- Securing Strap: A thin, adjustable elastic band that loops around the patient's ears and fastens under the chin. It keeps the prongs in place without applying excessive pressure, enabling long-term wear (e.g., 8-12 hours for home care patients).
- Flow Connector: A standardized barb fitting at the end of the tubing, which attaches to the oxygen flowmeter. This ensures a tight, leak-free connection to control oxygen output accurately.
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