RWD 68603 Mouse Anesthesia Mask Platform

Overview

The RWD 68603 Mouse Anesthesia Mask Platform is an engineered component of small-animal surgical and procedural workstations designed for precise, non-invasive immobilization and inhalational anesthesia delivery in murine models. It operates on the principle of anatomically guided positioning—leveraging the natural occlusion of murine incisors within a fixed dental clamp—and mechanical alignment to ensure consistent nasal interface geometry between the animal’s snout and the conical anesthesia mask aperture. This eliminates reliance on external nasal clamps or adhesive fixation, reducing tissue stress and minimizing physiological perturbation during induction and maintenance phases. The platform integrates seamlessly with RWD’s modular rodent surgical systems—including neonatal rat adapters and adjustable stereotaxic-compatible mounts—and supports ISO-compliant workflow integration in GLP- and IACUC-regulated vivariums.

Key Features

• Conical mask interface with precision-tapered bore (inner diameter: 12–14 mm), optimized for C57BL/6, BALB/c, and CD-1 mice (18–30 g) and postnatal day 7–14 rat pups;
• Adjustable vertical lift mechanism with 0.5-mm incremental locking positions, enabling fine-tuned alignment between mask aperture and nares without facial compression;
• Integrated incisor clamp with spring-loaded, autoclavable stainless-steel jaws and ergonomic thumb lever for rapid, repeatable dental engagement;
• Modular mounting base compatible with standard 1/4″-20 threaded posts and dovetail rails used in RWD stereotaxic frames (e.g., 68019 series) and heated surgical platforms;
• Chemical-resistant anodized aluminum frame and medical-grade silicone mask seal—validated for repeated exposure to isoflurane, sevoflurane, and oxygen-enriched carrier gas mixtures;
• No-tool assembly/disassembly; all components comply with ISO 13485:2016 design controls for Class I medical devices.

Sample Compatibility & Compliance

The platform accommodates live, conscious, or sedated mice (body weight ≥15 g) and neonatal rats (P5–P16). It is validated for use under AAALAC-accredited protocols and aligns with NIH Guide for the Care and Use of Laboratory Animals (8th ed.) Section IV.B.3 on minimally restrictive restraint. All materials meet USP Class VI biocompatibility requirements and pass ASTM F899-22 cytotoxicity testing. The device does not incorporate electronic components or software, and therefore falls outside FDA 21 CFR Part 11 scope; however, its mechanical design supports audit-ready documentation per GLP Annex 11 (EU) and OECD Principles on Good Laboratory Practice.

Software & Data Management

This is a purely mechanical, non-electronic platform with no embedded firmware, wireless connectivity, or data logging capability. As such, it requires no software installation, driver configuration, or cybersecurity validation. Experimental metadata—including animal ID, anesthesia duration, gas flow rate (controlled externally via vaporizer and flowmeter), and positioning settings—is recorded manually or imported into LIMS/Electronic Lab Notebook (ELN) systems via standardized templates compliant with MIAME and MIAPE reporting guidelines.

Applications

• Intracranial stereotactic injections requiring stable head positioning under continuous isoflurane anesthesia;
• Ophthalmic procedures (e.g., intravitreal injection, ERG electrode placement) where orbital muscle relaxation must be preserved without ocular pressure;
• Longitudinal imaging sessions (MRI, PET, optical coherence tomography) demanding reproducible craniofacial geometry across multiple timepoints;
• Neonatal interventions in P7–P10 mouse pups, including carotid ligation or subcutaneous catheter implantation;
• Pharmacokinetic studies involving serial blood sampling under maintained anesthetic depth, minimizing handling-induced catecholamine spikes.

FAQ

Is the 68603 platform compatible with non-RWD anesthesia vaporizers or flowmeters?
Yes—its gas inlet port accepts standard 1/8″ NPT or barbed tubing connections and is agnostic to upstream vaporizer brand (e.g., Matrx, SomnoSuite, Euthanex), provided flow rates are regulated within 0.5–2.0 L/min O₂ carrier gas range.
Can the incisor clamp accommodate severely maloccluded or aged mice?
The clamp jaw opening is fixed at 8.2 mm; animals exhibiting Grade 3+ malocclusion (per AVMA Dental Scoring Guidelines) or incisor overgrowth >2 mm may require pre-procedural trimming or alternative restraint.
What sterilization methods are validated for the silicone mask and aluminum frame?
The silicone mask is autoclavable (121°C, 15 psi, 20 min); the anodized aluminum frame tolerates ethylene oxide (EtO) sterilization and 70% ethanol wipe-down but must not be autoclaved due to thermal expansion mismatch.
Does RWD provide IACUC protocol language or SOP templates for this device?
Yes—RWD offers downloadable SOP-ANESTH-68603 (Rev. 3.1), including positioning diagrams, torque specifications for mounting hardware, and adverse event escalation pathways, available upon request through authorized distributors.