What animal weights is this breathing circuit suitable for?

This non-rebreathing circuit (Mapleson F/Jackson-Rees) is recommended for rodents and animals under 7 kg, as it delivers oxygen and anesthetic gases with minimal breathing resistance. For subjects over 7 kg, a rebreathing system is recommended due to lower resistance needs.

What are the connector specifications and will it fit our anesthesia machine?

This circuit features 22mm male and 15mm female connectors with a 1.5m length. You should verify these connector sizes are compatible with your anesthesia delivery system and face masks before ordering. Contact our support team if you need compatibility verification.

What is the difference between the Mapleson F and Duo-limb circuit options?

The Mapleson F (Jackson-Rees) is a non-rebreathing circuit designed for minimal breathing resistance in small animals, while the Duo-limb is a modified Mapleson D system with separate inhalation and exhalation limbs. The specific differences in dead space and resistance between these options are best discussed with our technical team.

How does this circuit manage carbon dioxide removal?

As a non-rebreathing circuit, this system removes carbon dioxide through higher fresh gas flow rates rather than chemical absorption, minimizing breathing resistance. The recommended gas flow rate should be approximately three times the animal's minute volume to ensure adequate CO2 elimination.

Is this circuit reusable and what maintenance is required?

The product description does not specify cleaning, sterilization, or maintenance requirements. Please contact our support team for detailed care instructions, reusability information, and recommended sterilization protocols.

What fresh gas flow rates should I use with this circuit?

Fresh gas flow should be approximately three times your animal's minute volume. The product includes a reference table showing recommended flow rates based on body weight and estimated tidal volume, which you should consult when setting up your anesthesia delivery.

How quickly can this be shipped and do you offer bulk discounts?

Specific shipping timeframes and bulk pricing are not detailed in the product information. Please contact our sales or support team with your quantity needs and timeline requirements for accurate shipping and pricing information.

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Anesthesia & Ventilation

Breathing Circuit

Name: Breathing Circuit
Brand: ConductScience
SKU: RWD-R-NBC-F(JR)/ R-BC-DL
Availability: InStock

$50.00 - $105.00

Anesthetic breathing circuits for laboratory animals, offering Mapleson F non-rebreathing and dual-limb configurations with standard connectors for subjects under 7 kg.

Key Specifications

connector_size_male

22mm

connector_size_female

15mm

circuit_types

Mapleson F Non-rebreathing Circuit (Jackson-Rees), Modified Mapleson D system (Bain Coaxial), Breathing Circuit Duo-limb

recommended_weight_threshold

7 kg (non-rebreathing for <7kg, rebreathing for >7kg)

dead_space_consideration

Volume of expired carbon-rich gas that remains in breathing system

Automation Level

manual

SKU:RWD-R-BC-DL

Category:Anesthesia & Ventilation

Need Help? Visit our Support CenterKnowledge base, order lookup, and ticket support

Scientist guidance

Louise Corscadden, PhD

Neuroscience · ConductScience

Ask Louise about Breathing Circuit fit, setup, configuration, or quote prep.

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The RWD Breathing Circuit provides essential gas delivery and ventilation support for laboratory animal anesthesia procedures. This system offers two distinct configurations: Option 1 features a Mapleson F non-rebreathing circuit (Jackson-Rees modification) designed for subjects under 7 kg, while Option 2 provides a dual-limb breathing circuit with standard 22mm male and 15mm female connectors at 1.5m length. Both configurations are engineered to minimize breathing resistance while effectively managing carbon dioxide elimination during anesthetic procedures.

Non-rebreathing circuits like the Mapleson F system deliver fresh anesthetic gases with minimal dead space volume, reducing the risk of carbon dioxide rebreathing in smaller laboratory animals. The dual-limb configuration enables bidirectional gas flow management with separate inspiratory and expiratory pathways. The 1.5m circuit length provides sufficient distance between the anesthesia machine and the research subject while maintaining optimal gas delivery characteristics. Selection between circuit types depends on subject weight, experimental requirements, and ventilation needs.

How It Works

The Mapleson F circuit operates as a T-piece system where fresh gas flow enters near the patient connection, with exhaled gases vented through a reservoir bag and excess gas valve. This configuration minimizes rebreathing by ensuring expired CO2-rich gas is flushed from the system before the next inspiration. The Jackson-Rees modification adds an open-ended reservoir bag that serves as both a visual indicator of spontaneous breathing and a means for assisted ventilation.

The duo-limb circuit employs separate inspiratory and expiratory pathways connected through 22mm male and 15mm female standard connectors. Fresh gas travels through the inspiratory limb while exhaled gases are removed through the expiratory pathway, preventing mixing of fresh and expired gases. The 1.5-meter circuit length provides practical working distance while the dual-pathway design reduces dead space compared to single-limb systems.

Both configurations rely on adequate fresh gas flow rates (typically 2-3 times minute ventilation) to prevent CO2 accumulation. The absence of unidirectional valves in these non-rebreathing systems reduces breathing resistance, making them particularly suitable for subjects with limited respiratory capacity.

Features & Benefits

Mapleson F Non-rebreathing Design

Provides low-resistance breathing pathway suitable for subjects under 7 kg with minimal work of breathing.

Jackson-Rees Modification

Enables visual monitoring of spontaneous respiration and facilitates manual assisted ventilation when needed.

22mm Male to 15mm Female Connectors

Ensures compatibility with standard anesthetic equipment and endotracheal tube connections.

1.5-Meter Circuit Length

Provides adequate working distance from gas source while minimizing dead space volume that could increase CO2 rebreathing.

Duo-limb Configuration Option

Separates inspiratory and expiratory gas flows to prevent mixing and reduce dead space compared to single-limb systems.

Non-rebreathing Gas Flow Pattern

Eliminates need for CO2 absorption canisters while maintaining effective carbon dioxide removal through high fresh gas flow.

Minimal Circuit Resistance

Reduces respiratory work load on small subjects, preventing respiratory muscle fatigue during extended procedures.

Feature	This Product	Typical Alternative	Advantage
Circuit Length	1.5-meter length	Standard circuits often range from 1.0-2.0 meters	Provides optimal balance between working distance and dead space minimization for small animal procedures.
Connector Compatibility	22mm male/15mm female standard connectors	Some circuits use proprietary connector systems	Ensures broad compatibility with existing anesthetic equipment and endotracheal tube systems.
Circuit Configuration Options	Both Mapleson F and duo-limb designs available	Many suppliers offer only single circuit types	Allows protocol optimization based on specific ventilation monitoring and gas flow requirements.
Weight Threshold Design	Optimized for subjects under 7 kg	Some circuits attempt broader weight ranges	Specifically engineered breathing resistance characteristics for small laboratory animal respiratory physiology.

The RWD breathing circuits provide specialized non-rebreathing configurations with standard connector compatibility and appropriate circuit length for small animal research applications. The dual configuration options support various anesthetic protocols while maintaining the low-resistance characteristics required for subjects under 7 kg.