Description
Quick answer: This is the genuine ResMed double-limb (dual-limb) breathing circuit for the Astral ventilator series (part 21301) — a smooth-bore 22mm adult circuit with water traps, ~1.8m (72″). A double-limb circuit uses separate inspiratory and expiratory tubes, a configuration used in certain clinical setups (fully supported on the Astral 150, which adds double-limb and FiO₂ monitoring). The water traps manage condensation on humidified setups; 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; the Astral requires the correct double-limb adapter and a “Learn Circuit” procedure. Single-patient use.
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. A double-limb circuit requires the Astral double-limb adapter (part 27980) to be fitted, and after connecting the circuit the Astral requires a “Learn Circuit” procedure so the ventilator characterizes it. 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 double-limb smooth-bore circuit, 22mm × ~1.8m — with water traps (inspiratory + expiratory limbs)
Not included: double-limb adapter (27980), antibacterial/breathing filter, 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). A double-limb (dual-limb) circuit differs from a single-limb one by using two separate tubes — an inspiratory limb carrying gas to the patient and an expiratory limb returning exhaled gas to the ventilator. This gives the ventilator more precise control and monitoring of exhaled gas, and is used in certain clinical configurations.
Key characteristics of this version:
- Double-limb — separate inspiratory and expiratory limbs. Fully supported on the Astral 150 (which adds double-limb circuit support and FiO₂ monitoring over the Astral 100).
- Smooth-bore 22mm — smooth internal walls minimize airflow resistance (vs corrugated); 22mm is the adult standard. (15mm and 10mm versions exist for lower flows/pediatric use.)
- ~1.8m (72″) adult length.
- Water traps — collect condensation that forms when humidification is used, so water doesn’t pool in the circuit or reach the patient. This is the water-trap configuration.
It’s single-patient use and latex-free. Circuits are consumables — replaced per the clinical team’s schedule and hygiene protocol. A double-limb circuit needs the double-limb adapter (27980) fitted to the Astral.
Double-limb circuit variants (for reference)
Match the exact circuit your clinical team specifies:
- 21301 (this) — double-limb smooth-bore 22mm with water trap (adult)
- 21303 — double-limb smooth-bore 22mm (no water trap)
- 21302 / 21304 — the 15mm equivalents (with / without water trap)
- 21305 — double-limb smooth-bore 10mm
- 21306 / 21308 — corrugated 22mm (with / without water trap)
(Single-limb, corrugated, heated, and coaxial circuits are also available.)
Key features
- Genuine ResMed Astral double-limb circuit (21301) — smooth-bore 22mm × ~1.8m.
- Separate inspiratory + expiratory limbs — precise exhaled-gas control/monitoring.
- With water traps — manages condensation on humidified setups.
- Smooth bore — low airflow resistance; 22mm adult standard.
- Fully supported on the Astral 150 — requires the double-limb adapter (27980).
- Single-patient use, latex-free — a ventilator consumable.
Specifications
| Specification | Detail |
|---|---|
| Product type | Double-limb (dual-limb) ventilator breathing circuit |
| Compatible ventilator | ResMed Astral series (double-limb fully supported on Astral 150) |
| Bore | Smooth-bore |
| Diameter | 22mm (adult) |
| Length | ~1.8 m (72″) |
| Limbs | Two — inspiratory + expiratory |
| Water traps | Yes (for humidified use) |
| Requires | Astral double-limb adapter (27980); “Learn Circuit” procedure |
| Filter | Antibacterial filter not included |
| Use | Single-patient use; latex-free |
| Related | 21303 (no water trap) · 21302/21304 (15mm) · 21305 (10mm) · corrugated variants |
| Prescription | Clinician-directed (ventilator component) |
| ResMed reference / SKU | 21301 |
| Brand | ResMed |
Frequently asked questions
What’s a double-limb circuit?
It uses two separate tubes — an inspiratory limb carrying gas to the patient and an expiratory limb returning exhaled gas to the ventilator — for more precise control and monitoring. Your clinical team decides the circuit type.
Which ventilator does it fit?
The ResMed Astral series; double-limb is fully supported on the Astral 150. It requires the double-limb adapter (27980), and the Astral needs a “Learn Circuit” procedure after fitting.
What do the water traps do?
They collect condensation that forms when humidification is used, so water doesn’t pool in the circuit or reach the patient.
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.
Is the filter or adapter included?
No — the antibacterial filter and the double-limb adapter (27980) are separate.
Can I choose my own circuit?
No — 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. Fit the correct double-limb adapter and perform the Astral “Learn Circuit” procedure; follow the Astral Clinical Guide. This listing is informational and is not medical advice.
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