Description
Quick answer: This is the genuine ResMed single-limb breathing circuit for the Astral ventilator series (part 21313) — a smooth-bore 22mm × 1.8m circuit with a water trap and expiratory valve, using ResMed’s QuickConnect connection. The breathing circuit is the tubing that carries gas from the ventilator to the patient interface; the water trap manages condensation on humidified setups, and the smooth bore minimizes airflow resistance. Important: this is a clinical ventilator component — the circuit type and setup are determined by the patient’s clinical team, and the Astral requires a “Learn Circuit” procedure after fitting. Single-patient use. Antibacterial filter not included.
Important — ventilator component (clinician-directed)
The breathing circuit is part of a life-support ventilation setup. Which circuit to use, how to assemble it, and all settings are determined by the patient’s healthcare/respiratory-care team — different patients use different circuit types at different times. After connecting a circuit, the Astral requires a “Learn Circuit” procedure so the ventilator characterizes the circuit. Always follow the Astral Clinical Guide and your clinical team’s instructions. This listing is informational and is not medical advice.
What’s included
- 1 × Astral single-limb smooth-bore circuit, 22mm × 1.8m — with water trap and expiratory (QuickConnect) valve, and 22mm end adapters
Not included: antibacterial/breathing filter (separate), ventilator, humidifier, mask/interface.
About this part
Breathing (patient) circuits are the tubing that connects the ventilator to the patient’s interface (mask, mouthpiece, or tracheostomy). This is a single-limb circuit — one tube carries gas to the patient, with an expiratory valve (part of ResMed’s QuickConnect system) handling exhaled gas.
Key characteristics of this version:
- Smooth-bore 22mm — the smooth internal wall minimizes airflow resistance (vs corrugated), and 22mm is the standard adult diameter. (15mm versions exist for lower flows/pediatric use.)
- 1.8m length with 22mm end adapters.
- Water trap — collects condensation that forms in the tube when humidification is used, so water doesn’t pool in the circuit or reach the patient. This is the “humidified” configuration.
- Expiratory valve (QuickConnect) — single-limb circuits vent exhaled gas through this valve.
It’s single-patient use and latex-free. Circuits are consumables — replaced per the clinical team’s schedule and hygiene protocol.
Compatibility: designed for the ResMed Astral ventilator series (the Astral supports single- and double-limb circuits via interchangeable circuit adapters). Confirm the exact circuit against the patient’s prescribed setup and the Astral compatibility guide.
Circuit variants (for reference)
ResMed’s Astral single-limb smooth-bore circuits come in a few configurations — match the one your clinical team specifies:
- 21311 — smooth-bore 22mm with exhalation valve (no water trap)
- 21313 (this) — smooth-bore 22mm with water trap and exhalation valve
- 21312 / 21314 — the 15mm equivalents
(Corrugated, heated, and double-limb circuits are also available for different setups.)
Key features
- Genuine ResMed Astral single-limb circuit (21313) — smooth-bore 22mm × 1.8m.
- With water trap — manages condensation on humidified setups.
- Smooth bore — low airflow resistance; 22mm adult standard.
- QuickConnect expiratory valve — ResMed’s single-limb connection.
- Single-patient use, latex-free — a ventilator consumable.
- For the Astral series — clinician-specified; “Learn Circuit” required.
Specifications
| Specification | Detail |
|---|---|
| Product type | Single-limb ventilator breathing circuit |
| Compatible ventilator | ResMed Astral series (100 / 150) |
| Bore | Smooth-bore |
| Diameter | 22mm (adult) |
| Length | 1.8 m |
| Includes | Circuit, 22mm end adapters, water trap, expiratory (QuickConnect) valve |
| Water trap | Yes (for humidified use) |
| Filter | Antibacterial filter not included |
| Use | Single-patient use; latex-free |
| Setup | “Learn Circuit” procedure required on the Astral |
| Related | 21311 (no water trap) · 21312/21314 (15mm) · corrugated/heated/double-limb variants |
| Prescription | Clinician-directed (ventilator component) |
| ResMed reference / SKU | 21313 |
| Brand | ResMed |
Frequently asked questions
What is a breathing circuit?
It’s the tubing that carries gas from the ventilator to the patient’s interface (mask, mouthpiece, or tracheostomy). Single-limb circuits use one tube with an expiratory valve.
What does the water trap do?
It collects condensation that forms when humidification is used, so water doesn’t pool in the circuit or reach the patient — that’s the “humidified” configuration.
What’s “smooth bore” vs corrugated?
Smooth bore has a smooth internal wall for lower airflow resistance; corrugated is ridged. Your clinical team specifies which to use.
Is the filter included?
No — the antibacterial/breathing filter is separate.
Which ventilator does it fit?
The ResMed Astral series. Confirm against the patient’s prescribed setup and the Astral compatibility guide. After fitting, the Astral requires a “Learn Circuit” procedure.
Can I choose my own circuit?
No — the circuit type and setup are determined by the patient’s clinical/respiratory-care team.
Do I need a prescription?
This is a ventilator component used under clinical direction. Contact us to confirm requirements.
How is it delivered?
Given the clinical nature of ventilator components, please contact us to confirm availability and delivery options.
This is a component of a life-support ventilation system. Circuit selection, assembly, and settings are determined by the patient’s clinical team. Perform the Astral “Learn Circuit” procedure and follow the Astral Clinical Guide. This listing is informational and is not medical advice.
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