RWD Lightweight Mouse Stereotaxic Instrument

Overview

The RWD Lightweight Mouse Stereotaxic Instrument is a precision-engineered neurosurgical platform designed specifically for murine models in academic, pharmaceutical, and contract research organization (CRO) laboratories. Built upon the foundational principles of stereotactic coordinate geometry—where anatomical targets are localized relative to standardized bregma-lambda landmarks—the instrument enables reproducible, sub-millimeter spatial registration of intracranial interventions. Its compact footprint (255 mm × 255 mm base), POM polymer ear bars, and thermally stable mechanical architecture ensure consistent performance under routine vivarium conditions. Unlike general-purpose multi-species frames, this model prioritizes ergonomic efficiency and metrological fidelity for mouse-scale neuroanatomy, reducing setup time without compromising positional repeatability.

Key Features

• Mouse-optimized base geometry with reinforced rigidity and low center-of-gravity design to minimize vibration-induced drift during microinjection or electrophysiology.
• Dual independent locking mechanisms: separate vertical clamping and positioning knobs eliminate torque coupling, enabling precise angular alignment at any orientation between 0° and 180°.
• High-resolution micrometer-driven motion system (0.1 mm graduation) across all three axes (X/Y/Z), featuring dual-lead screw transmission for backlash-free, smooth translation and enhanced load stability.
• Ergonomic ear bar assembly constructed from polyoxymethylene (POM), offering superior stiffness-to-weight ratio, chemical resistance to disinfectants, and low-friction articulation.
• Calibrated ear bar insertion tips: 18° blunt geometry and circular hollow-serrated profile distribute mechanical load across the temporal bone surface, mitigating skull fracture risk during fixation.
• Integrated visual guidance: engraved directional indicators on vertical column prevent misalignment during reorientation; laser-etched scale markings reduce operator visual fatigue during prolonged procedures.
• Thermally invariant base plate: surface-hardened anodized aluminum substrate maintains flatness and dimensional integrity across 15–30 °C ambient range—critical for longitudinal studies requiring repeated instrumentation sessions.

Sample Compatibility & Compliance

The instrument supports standardized murine stereotaxic atlases (e.g., Paxinos & Franklin, 4th ed.) via direct coordinate mapping. Optional adapters extend compatibility to rats, rabbits, guinea pigs, avian species, and reptiles (e.g., geckos), though primary validation data and mechanical calibration are established for C57BL/6, BALB/c, and CD-1 mouse strains. All structural components comply with ISO 13485-aligned manufacturing controls. The device is intended for use in GLP-regulated nonclinical safety studies (per OECD Series 400–499) and supports audit-ready documentation when integrated with validated microinjection or electrophysiology modules. No embedded electronics or software require FDA 21 CFR Part 11 compliance; however, digital-readout variants (models 68513/68516) include traceable encoder logs compatible with LIMS integration.

Software & Data Management

As a purely mechanical positioning system, the base lightweight instrument operates without firmware or onboard computation. Digital-readout configurations (68513/68516) feature optical encoders interfaced via USB or RS-232 to third-party acquisition platforms (e.g., Spike2, MATLAB, or custom Python-based control suites). Encoder output provides timestamped, ASCII-formatted XYZ coordinates with ±0.05 mm linearity error over full travel. Raw position data exports support CSV and HDF5 formats for downstream statistical analysis in R or Python. Audit trails—including user ID, timestamp, and coordinate set—are generated only when paired with compliant lab information management systems (LIMS) or electronic lab notebooks (ELN).

Applications

• Targeted intracerebral injection of viral vectors (AAV, lentivirus), tracers (CTB, Fluoro-Gold), or pharmacologic agents (siRNA, CRISPR-Cas9 complexes).
• Chronic implantation of microelectrode arrays (MEAs), optrodes, or fiber photometry cannulas with ≤100 µm targeting variance.
• Stereotactic-guided cranial window surgery for two-photon imaging or intrinsic signal optical mapping.
• Electrolytic lesioning or radiofrequency ablation in behavioral neuroscience paradigms (e.g., fear conditioning, Morris water maze).
• Validation of MRI/PET co-registration pipelines using histologically verified injection site coordinates.

FAQ

Is this instrument compatible with standard mouse brain atlases?
Yes—coordinates align directly with Paxinos & Franklin’s *The Mouse Brain in Stereotaxic Coordinates* (4th edition) and the Allen Brain Atlas reference space.
What maintenance is required for long-term accuracy?
Annual verification using NIST-traceable gauge blocks is recommended; no recalibration is needed under normal usage if stored in controlled environments.
Can the digital-readout version connect to existing lab automation software?
Yes—USB HID and Modbus RTU protocols enable integration with LabVIEW, Python (pySerial), and commercial electrophysiology suites.
Are replacement ear bars and nose clips available as consumables?
Yes—POM ear bars (RWD P/N EB-MOUSE-01), stainless steel nose clips (NC-MOUSE-02), and adapter kits are stocked globally through authorized distributors.
Does the instrument meet ISO 13485 or CE requirements for regulated environments?
The mechanical frame complies with ISO 13485 manufacturing standards; CE marking applies to digital-readout variants when supplied with EU-declared conformity documentation.