RWD R510-87 MRI-Compatible Single-Lumen Anesthesia Mask for Rats

Overview

The RWD R510-87 is a precision-engineered, MRI-compatible single-lumen anesthesia mask designed specifically for rats (typically 200–500 g) undergoing inhalational anesthesia in preclinical research settings. It operates on the principle of controlled delivery and containment of volatile anesthetic agents—such as isoflurane or sevoflurane—via a dedicated gas inlet connected to an anesthesia vaporizer and flowmeter system. The mask maintains a sealed interface around the animal’s nose and mouth while minimizing dead space and resistance to airflow, ensuring stable anesthetic depth and rapid induction/recovery kinetics. Its non-metallic construction eliminates magnetic interference and RF heating risks, enabling safe use inside high-field MRI bores (1.5T–7T) during functional imaging or longitudinal physiological monitoring. Unlike generic face masks, the R510-87 integrates concentric lumen architecture that supports simultaneous gas delivery and active waste gas evacuation—critical for operator safety and regulatory compliance in modern vivariums.

Key Features

• MRI-safe non-metallic polymer housing (FDA-compliant medical-grade silicone and polyetherimide)
• Single-lumen concentric design optimized for rat anatomy—ensures uniform gas distribution and reduced rebreathing
• Low internal volume (< 8 mL) to minimize anesthetic lag and improve dose titration accuracy
• Integrated 6 mm OD gas tubing port compatible with standard small-animal anesthesia circuits (ISO 5356-1 compliant connectors)
• Modular mounting interface for benchtop clamps, stereotaxic frames, or MRI-compatible positioning sleds
• Autoclavable up to 121°C (250°F) for repeated sterilization without material degradation
• Compatible with RWD A-1000 series anesthesia machines and third-party scavenging systems meeting ISO 10993-1 biocompatibility standards

Sample Compatibility & Compliance

The R510-87 is validated for use with Sprague-Dawley, Wistar, and Long-Evans rats within the 200–500 g weight range. Its ergonomic contour accommodates natural head positioning during supine or lateral recumbency, preserving airway patency without mandibular compression. All materials comply with USP Class VI and ISO 10993-5 cytotoxicity requirements. The mask meets IEC 61000-4-3 immunity standards for electromagnetic compatibility in MRI environments and adheres to OSHA 29 CFR 1910.1200 (Hazard Communication) and NIOSH guidelines for waste anesthetic gas exposure limits (<2 ppm time-weighted average). When paired with certified carbon filter canisters (e.g., RWD SC-200 series), it satisfies NIH OLAW and AAALAC International recommendations for active scavenging in rodent surgical suites.

Software & Data Management

While the R510-87 is a passive hardware component, its performance is fully integrated into RWD’s digital anesthesia workflow. When used with the RWD A-1000 Smart Anesthesia Workstation, real-time gas concentration (via built-in IR sensors), fresh gas flow (0.2–2 L/min), and circuit pressure are logged synchronously with video recordings and physiological telemetry (ECG, SpO₂, temperature). Audit trails comply with FDA 21 CFR Part 11 requirements—including electronic signatures, user access controls, and immutable data export in CSV/EDF+ formats. Scavenging efficiency metrics (e.g., % reduction in ambient isoflurane measured by photoacoustic gas analyzers) can be archived alongside procedural metadata for GLP-compliant study reporting.

Applications

• Functional MRI (fMRI) and diffusion tensor imaging (DTI) studies requiring motion-free, hemodynamically stable rat models
• Neurosurgical interventions—including craniotomy, intracerebral injection, and optogenetic fiber implantation—where unobstructed cranial access is essential
• Longitudinal pharmacokinetic/pharmacodynamic studies involving repeated anesthetic exposures across multiple timepoints
• Cardiovascular phenotyping using echocardiography or invasive pressure-volume loop analysis under stable anesthetic conditions
• Development and validation of novel anesthetic delivery protocols aligned with ARRIVE 2.0 reporting guidelines

FAQ

Is the R510-87 suitable for use inside a 7 Tesla MRI scanner?
Yes—its fully non-ferromagnetic construction and absence of conductive traces eliminate eddy current generation and image artifact under ultra-high-field conditions.
Can this mask be used with sevoflurane at high fresh gas flows (e.g., 2 L/min)?
Yes—the low-resistance flow path and optimized internal geometry maintain laminar delivery up to 2.5 L/min without turbulence-induced desiccation or pressure fluctuations.
Does the mask include a CO₂ absorbent chamber?
No—the R510-87 is a non-rebreathing mask intended for open-circuit anesthesia; CO₂ scrubbing occurs upstream in the anesthesia machine’s soda lime canister.
What cleaning protocol is recommended between animal subjects?
Wipe with 70% isopropyl alcohol, rinse with sterile water, and air-dry—autoclaving is permissible but not required for routine decontamination.
How does the R510-87 differ from the R510-86 model?
The R510-86 is dimensionally scaled for mice (20–35 g) with a smaller internal volume (~3.5 mL) and narrower facial seal profile; both share identical MRI compatibility and scavenging interface specifications.