Muromachi MK-AL21D Small Animal Anesthesia Machine

Overview

The Muromachi MK-AL21D Small Animal Anesthesia Machine is a precision-engineered, benchtop vaporizer-based anesthesia delivery system designed specifically for laboratory rodents, rabbits, and other small mammals weighing up to 5 kg. It operates on the principle of calibrated carrier gas (medical-grade oxygen or medical air) saturation through a temperature-compensated, calibrated precision vaporizer—ensuring stable, repeatable anesthetic vapor output across clinically relevant flow rates. Unlike open-drop or non-vaporized methods, the MK-AL21D delivers precise, adjustable concentrations of volatile anesthetics—including isoflurane and sevoflurane—within a validated 0–5% (v/v) range, enabling controlled induction, maintenance, and rapid emergence. Its compact footprint (W × D × H: 240 × 280 × 180 mm), low mass (≈3.2 kg), and integrated flow control make it suitable for shared core facilities, mobile surgical carts, and space-constrained vivariums without compromising performance or regulatory traceability.

Key Features

• Calibrated dual-range oxygen flowmeter with fine-adjustment needle valve, supporting accurate delivery from 0.5 to 5.0 L/min in 0.1 L/min increments—optimized for both induction (1–3 L/min) and maintenance (0.5–1.5 L/min) phases.
• 250 mL stainless-steel vaporizer chamber with built-in thermal stabilization and anti-siphon design, ensuring consistent output independent of ambient temperature fluctuations between 15–30°C.
• Key-actuated fill system with proprietary adapter interface prevents accidental overfilling, solvent spillage, or cross-contamination during anesthetic refilling—fully compliant with ISO 8535-1:2021 requirements for vaporizer safety mechanisms.
• No external gas cylinder dependency: compatible with centralized medical gas supply lines via standard DISS (Diameter Index Safety System) inlet or portable oxygen cylinders equipped with CGA 870 regulators.
• Non-flammable anesthetic compatibility only—designed exclusively for use with modern halogenated agents (isoflurane, sevoflurane, desflurane); incompatible with ether or chloroform per manufacturer specifications.
• Integrated waste-gas scavenging port (19 mm OD) supports connection to active or passive ducted systems meeting OSHA PEL (Permissible Exposure Limit) and NIOSH REL (Recommended Exposure Limit) thresholds for halogenated anesthetics.

Sample Compatibility & Compliance

The MK-AL21D is validated for use with mice (C57BL/6, BALB/c), rats (Sprague-Dawley, Wistar), guinea pigs, hamsters, and New Zealand White rabbits under standardized IACUC- and AAALAC-accredited protocols. It conforms to key international standards including ISO 8535-1 (Anesthetic vaporizers — Part 1: Requirements and tests), EN ISO 80601-2-13 (Medical electrical equipment — Part 2-13: Particular requirements for basic safety and essential performance of anesthetic workstations), and supports GLP-compliant documentation when paired with optional digital flow logging modules. All wetted components are USP Class VI-certified, and the vaporizer housing meets IP20 ingress protection rating for laboratory environments.

Software & Data Management

While the MK-AL21D is a standalone analog device with no embedded microprocessor, it integrates seamlessly with third-party data acquisition platforms via optional analog voltage output (0–5 V DC proportional to flow rate) and TTL-compatible trigger signals for synchronized physiological monitoring (e.g., ECG, respiration, temperature). When deployed in FDA-regulated preclinical studies, its mechanical calibration logbook—maintained per ASTM E2500-13 (Standard Guide for Specification, Design, and Verification of Pharmaceutical and Biopharmaceutical Manufacturing Systems and Equipment)—supports 21 CFR Part 11 audit readiness when combined with electronic lab notebook (ELN) entries documenting vaporizer calibration dates, agent lot numbers, and daily leak-test records.

Applications

• Routine surgical procedures requiring stable, titratable anesthesia: craniotomy, laparotomy, orthotopic tumor implantation, and intracardiac injection.
• Long-duration functional imaging: fMRI, PET, and optical coherence tomography where hemodynamic stability and minimal anesthetic drift are critical.
• Behavioral pharmacology studies requiring precise anesthetic depth modulation across treatment arms (e.g., dose-response curves for neuroactive compounds).
• Vivarium-wide anesthesia distribution using optional Muromachi MDS-4 Anesthetic Gas Splitter, enabling simultaneous delivery to up to four independent induction chambers or nose-cone stations.
• Teaching laboratories: ideal for hands-on instruction in veterinary anesthesiology principles, including MAC (Minimum Alveolar Concentration) determination and recovery kinetics analysis.

FAQ

What volatile anesthetics are compatible with the MK-AL21D?

Isoflurane, sevoflurane, and desflurane—only. Ether, chloroform, and halothane are explicitly prohibited due to flammability and vaporizer material incompatibility.
Is calibration certification included with purchase?

Yes—a factory-issued calibration certificate traceable to NIST standards is provided, covering flowmeter accuracy (±2% FS) and vaporizer output linearity (±0.2% at 2% setting, 21°C, 1 L/min O₂) at time of shipment.
Can the unit be used with compressed air instead of oxygen?

Yes, provided medical-grade compressed air (ISO 8573-1 Class 1,2,2) is supplied at 35–60 psi and filtered to remove oil and particulates; oxygen remains recommended for hypoxia-sensitive models.
What maintenance intervals are recommended?

Vaporizer internal cleaning every 6 months or after 500 hours of operation; flowmeter recalibration annually or after physical impact; full system leak test before each daily use per AANA guidelines.
Does the MK-AL21D meet UL/CE safety certification requirements?

It carries CE marking per EU MDR 2017/745 Annex II and complies with IEC 61010-1:2010 for laboratory electrical safety; UL listing is not applicable as it contains no powered electronics.