RWD R620-MRI MRI-Compatible Animal Anesthesia Machine

Overview

The RWD R620-MRI is a purpose-engineered MRI-compatible animal anesthesia machine designed for safe, stable, and precise anesthetic delivery during magnetic resonance imaging (MRI) procedures in preclinical research. Built to meet the stringent electromagnetic compatibility (EMC) requirements of high-field MRI environments, the R620-MRI has been independently verified for use in 3 Tesla (3T) and lower-field MRI systems. Its non-ferromagnetic construction, RF-shielded electronics, and passive pneumatic architecture eliminate magnetic interference, positional drift, and image artifact generation—ensuring uninterrupted MRI acquisition while maintaining consistent anesthetic depth. The system operates on the principle of calibrated vaporization of volatile anesthetics (e.g., isoflurane) via a temperature-compensated, precision-machined evaporator, integrated into a rebreathing circuit with CO₂ absorption. It is intended for use in institutional animal care and use committee (IACUC)-approved protocols and aligns with NIH OLAW and AAALAC International standards for humane experimental anesthesia.

Key Features

• MRI-Safe Design: Fully non-magnetic (no ferrous or paramagnetic components); validated for static magnetic fields up to 3T and gradient field exposure typical of clinical and preclinical MRI scanners.
• Research-Grade Isoflurane Evaporator: >120 mL capacity, factory-calibrated and individually tested for output accuracy across 0.5–4.0% concentration range; features thermal compensation and pressure-independent vaporization kinetics.
• Modular Track-Mounted CO₂ Absorber: Dual-action quick-release mechanism enables tool-free removal and reinstallation of the absorbent canister; accommodates standard 100–150 g soda lime or Baralyme formulations.
• Leak-Integrity Optimized Breathing Circuit: Integrated circuit plug design facilitates rapid occlusion testing and leak-check verification per ISO 80601-2-12 and IEC 62304 requirements.
• Active Waste Gas Scavenging Interface: Equipped with standardized 30 mm OD active scavenging port compliant with ASTM F1870-21, enabling connection to centralized vacuum or passive charcoal filtration systems for efficient isoflurane capture (>95% adsorption efficiency at recommended flow rates).
• Environmental Resilience: Rated for continuous operation within ambient temperatures of 10–35 °C and relative humidity ≤80% non-condensing—suitable for controlled MRI suite environments.

Sample Compatibility & Compliance

The R620-MRI supports intubated and mask-based anesthesia delivery for rodents (mouse, rat), rabbits, and small non-human primates. It interfaces seamlessly with stereotaxic MRI-compatible animal positioning systems and physiological monitoring platforms (e.g., ECG, respiration, temperature). The device complies with essential safety and performance requirements under IEC 60601-1 (3rd ed.) and IEC 60601-2-12 (Medical Electrical Equipment – Part 2-12: Particular Requirements for Basic Safety and Essential Performance of Anaesthetic Workstations). While not FDA-cleared for human use, it meets GLP-aligned documentation practices for preclinical study reporting and supports audit-ready traceability for AAALAC-accredited facilities.

Software & Data Management

The R620-MRI is a standalone analog-digital hybrid workstation with no embedded software or network connectivity—minimizing RF emissions and eliminating cybersecurity or firmware update dependencies. All control inputs (vaporizer dial, O₂ flow selector, bypass valve) are mechanical and tactile, ensuring deterministic behavior inside the MRI scanner room. Optional external digital flow meters (e.g., Brooks 5850E series) may be integrated upstream for quantitative gas flow logging, compatible with LabChart, MATLAB, or custom Python-based acquisition pipelines. Audit trails for maintenance and calibration are maintained manually per institutional SOPs, supporting 21 CFR Part 11–aligned recordkeeping when paired with electronic lab notebooks (ELNs).

Applications

• Longitudinal functional MRI (fMRI) studies requiring stable anesthesia over extended scan durations (≥2 hours).
• Diffusion tensor imaging (DTI) and spectroscopic MRI where motion artifacts and magnetic susceptibility distortions must be rigorously controlled.
• Multi-modal imaging workflows combining MRI with concurrent electrophysiology or optical imaging.
• Pharmacological challenge paradigms involving dynamic anesthetic titration during BOLD signal acquisition.
• Validation of novel anesthetic agents or delivery methods under MRI-guided physiological monitoring.

FAQ

Is the R620-MRI certified for use in 7T MRI systems?
No. The R620-MRI is validated for static magnetic fields up to 3T. Use in higher-field systems (e.g., 7T) requires site-specific EMC testing and is not supported by RWD’s regulatory dossier.
Does the unit include an integrated oxygen analyzer or apnea alarm?
No. The R620-MRI is a core anesthesia delivery platform; ancillary monitoring (O₂ concentration, end-tidal CO₂, respiratory rate) must be provided by third-party MRI-compatible sensors and data loggers.
Can the evaporator be used with sevoflurane or desflurane?
No. The R620-MRI evaporator is calibrated exclusively for isoflurane. Substitution with other volatile agents invalidates output accuracy and voids calibration certification.
What maintenance intervals are recommended for the CO₂ absorber?
Absorbent replacement is required after 4–6 hours of continuous use or upon color indicator change (if using indicator soda lime); maximum shelf life post-opening is 24 hours under ambient conditions.
Is service and calibration support available outside mainland China?
Yes. RWD maintains authorized service partners in the US, EU, and APAC regions; all calibrations follow traceable NIST-equivalent reference standards and include documented uncertainty budgets.