RWD VentStar Small Animal Ventilator

Overview

The RWD VentStar Small Animal Ventilator is a precision-engineered, compact ventilatory support system designed specifically for controlled mechanical ventilation in preclinical research and academic teaching environments. It operates on the principle of intermittent positive pressure ventilation (IPPV), delivering reproducible tidal volumes or airway pressures to small laboratory animals under anesthesia or during acute physiological studies. Engineered for high reproducibility and low system compliance, the VentStar employs a patented low-flow solenoid-based inspiratory cutoff mechanism—minimizing acoustic noise, reducing dead space, and enabling fine-grained volumetric control with minimal interference to animal physiology. Its architecture adheres to fundamental respiratory physiology principles, ensuring physiologically relevant gas exchange dynamics across species ranging from mice (10 g) to juvenile rabbits (up to 1 kg). The device is not intended for human use and complies with general electrical safety standards applicable to Class II medical-grade laboratory equipment.

Key Features

• Two clinically relevant ventilation modes: Volume-Controlled Ventilation (VCV) and Pressure-Controlled Ventilation (PCV), each configurable with independent parameter sets
• Integrated piston-driven IPPV mechanism with real-time pressure monitoring and peak inspiratory pressure (PIP) limit protection to prevent barotrauma
• Adjustable respiratory parameters including tidal volume (0.05–5 mL), respiratory rate (10–300 bpm), and inspiratory-to-expiratory ratio (I:E) with 0.1:1 to 4:1 range
• Advanced breath modulation functions: apnea detection with auto-resume, sigh breath (periodic augmented ventilation), and expiratory pause capability
• 7-inch full-color LED touchscreen with wide viewing angle, intuitive icon-based navigation, and responsive touch interface
• One-touch weight-based parameter initialization: automatically calculates and applies recommended VT, rate, and I:E based on user-entered animal body mass
• 10 programmable memory slots for saving and recalling protocol-specific configurations—ideal for multi-animal or longitudinal study workflows
• Gas compatibility with medical-grade oxygen, balanced air, isoflurane/sevoflurane vaporized mixtures, and other non-corrosive anesthetic carrier gases

Sample Compatibility & Compliance

The VentStar supports consistent ventilation across a defined biological weight range: 10 g (neonatal mice) to 1,000 g (young rabbits or large guinea pigs). Its flow path is optimized for low resistance and minimal internal volume (< 1.2 mL), preserving dynamic response fidelity during rapid breathing cycles. All wetted components are constructed from USP Class VI-certified biocompatible polymers and stainless-steel fittings compatible with common inhalational anesthetics. While not certified as a Class IIa medical device under EU MDR or FDA 510(k)-cleared, the VentStar is manufactured under ISO 13485-aligned quality management practices and conforms to IEC 61000-6-3 (EMC emissions) and IEC 61000-6-2 (immunity) standards. It is validated for use in GLP-compliant pharmacology and toxicology studies where instrument traceability and procedural consistency are documented per SOP.

Software & Data Management

The VentStar operates via embedded firmware without external PC dependency; however, it supports optional USB data logging (via proprietary RWD LogView software) for time-stamped export of real-time pressure, flow, and volume waveforms in CSV format. Audit trails include session timestamps, parameter change logs, and operator ID entry (when integrated into networked lab systems). The firmware architecture incorporates built-in self-diagnostics and fault-code reporting aligned with ISO/IEC 17025 calibration traceability requirements. For regulated environments, optional 21 CFR Part 11-compliant electronic signature modules and role-based access controls are available through RWD’s enterprise deployment package.

Applications

• Establishment and maintenance of ischemia-reperfusion models (e.g., myocardial infarction, cerebral hypoxia-ischemia)
• Intraoperative respiratory support during stereotaxic surgery, thoracotomy, or craniotomy in rodents
• Pharmacodynamic assessment of respiratory depressants or stimulants (e.g., opioid effects, analeptic screening)
• Respiratory mechanics studies—including compliance and resistance calculations using optional pneumotachograph integration
• Teaching laboratories for demonstrating ventilatory physiology, gas exchange principles, and anesthetic gas delivery kinetics
• Combined use with RWD’s inhalation anesthesia systems (e.g., E-Z Anesthesia series) to form fully integrated anesthetic-ventilation platforms

FAQ

Is the VentStar suitable for long-term ventilation (>6 hours)?
Yes—when used with appropriate humidification and temperature control (e.g., inline heated humidifier), the VentStar supports extended-duration ventilation protocols commonly employed in chronic disease modeling.
Can I connect third-party gas analyzers or pressure transducers?
Yes—the device features standardized 1/8″ NPT ports and analog 0–5 V output for synchronized external monitoring of airway pressure and flow signals.
Does it support spontaneous breathing modes like PSV or SIMV?
No—the VentStar implements controlled mandatory ventilation only (VCV/PCV); it does not provide patient-triggered or assisted spontaneous modes.
What maintenance is required for the solenoid valve assembly?
The electromagnetic cutoff valve requires no routine lubrication or recalibration; annual functional verification using RWD’s QC test kit is recommended.
Is firmware upgradable in the field?
Yes—updates are delivered via USB flash drive and retain all stored user protocols post-installation.