Quick answer: This is a single limb breathing circuit (smooth bore, 22 mm) for the ResMed Astral ventilator. The smooth interior minimizes airflow resistance for stable ventilation, the 72-inch (1.8 m) length gives flexibility in patient positioning, and the single limb circuit includes ResMed's QuickConnect with an expiratory valve. Latex-free and intended for single-patient use. ResMed reference code: 21311.
What is a single limb smooth bore circuit?
A breathing circuit is the tubing that carries air between the ventilator and the patient. This is a single limb circuit, meaning one tube carries inspiratory flow, with exhalation managed through an expiratory valve. The smooth bore interior (as opposed to corrugated/ribbed) reduces turbulence and airflow resistance, which helps deliver consistent ventilation. The Astral supports single and double limb circuits through interchangeable circuit adapters, so the circuit you use is matched to the adapter fitted to your device. Resmed
Key features
- Smooth bore design — low resistance for optimal, stable airflow.
- 22 mm diameter — standard adult Astral circuit connection.
- 72-inch (1.8 m) length — flexibility for patient positioning.
- Includes ResMed QuickConnect with expiratory valve.
- Latex-free, lightweight — patient comfort and reduced allergy risk.
- Single-patient use — supports hygiene and infection control.
Specifications
| Specification | Detail |
| Product type | Single limb circuit, smooth bore |
| Diameter | 22 mm |
| Length | 72 inch (≈1.8 m) |
| Includes | ResMed QuickConnect with expiratory valve |
| Material | Latex-free |
| ResMed reference code | 21311 |
| Compatible device | ResMed Astral series ventilators |
| Use | Single-patient use |
Is it compatible with my ventilator?
This circuit is designed for the ResMed Astral ventilator and connects via the appropriate single limb circuit adapter. After fitting or changing a circuit, the Astral requires a "learn circuit" procedure. Always follow your circuit configuration and your clinician's instructions.
Frequently asked questions
What is the difference between smooth bore and corrugated circuits? Smooth bore tubing has a smooth interior that lowers airflow resistance, while corrugated tubing is ribbed. Both are available for the Astral; your respiratory therapist will advise which is appropriate.
Does this circuit include an expiratory valve? Yes — Astral single limb circuits include ResMed's QuickConnect with an expiratory valve.
Is it for single or multiple patients? It is intended for single-patient use to support hygiene and infection control.
Is it latex-free? Yes, the circuit is latex-free to reduce the risk of allergic reactions.
Can I get it delivered in Brooklyn or shipped nationwide? Yes — Task Supply Corp offers FedEx shipping throughout the continental U.S., plus local pickup and delivery in Brooklyn and all five boroughs of New York City.
This product is a medical device accessory. Use it according to the ResMed Astral user guide and the directions of your healthcare provider.