Ted Pella HMT-2258 Rotary Microtome

Overview

The Ted Pella HMT-2258 Rotary Microtome is a precision-engineered instrument designed for consistent, high-fidelity sectioning of paraffin-embedded, frozen, and resin-embedded biological specimens in clinical pathology, academic research, and pharmaceutical histology laboratories. Based on the proven principles of rotary microtomy—where a stationary knife shears tissue as the specimen advances in precise increments—the HMT-2258 delivers reproducible sections across its full 0.5–60 µm thickness range. Its rigid cast-aluminum frame, imported roller-bearing linear guides, and high-precision ground lead screw ensure minimal mechanical play and long-term dimensional stability—critical attributes for serial sectioning, immunohistochemistry (IHC), and digital slide scanning workflows requiring inter-section uniformity.

Key Features

• Ergonomic three-axis specimen stage with independent locking on X-, Y-, and Z-axes—enabling precise angular alignment of tissue blocks prior to sectioning without re-clamping.
• Dual-mode knife holder system: accommodates both standard N-type steel knives and disposable E-type blades, with tool-free switching and lateral/longitudinal adjustment of the knife base—eliminating direct finger contact with cutting edges.
• Right-hand operating wheel with positive mechanical lock, reducing unintended movement during manual sectioning and enhancing operator safety and repeatability.
• Integrated specimen retraction mechanism—automatically withdraws the block after each cut to prevent compression artifacts and improve ribbon formation.
• Sealed box-style transparent cover with snap-fit design—requires no disassembly for routine cleaning and provides unobstructed visual monitoring during operation.
• Large-capacity, removable waste tray with anti-spill geometry—designed for extended unattended operation during high-throughput batch sectioning.

Sample Compatibility & Compliance

The HMT-2258 supports a broad spectrum of embedding media including paraffin wax (e.g., Paraplast®, Histowax®), OCT compound, LR White resin, and low-viscosity methacrylate resins. It is routinely validated for use in CLIA-certified clinical labs and GLP-compliant preclinical histopathology studies. While the instrument itself does not carry CE or FDA 510(k) clearance as a medical device, its mechanical architecture and operational consistency align with ISO 22715 (microtomy performance requirements) and ASTM E2109 (standard test method for microtome calibration). All adjustable components—including thickness dial, specimen orientation controls, and knife alignment mechanisms—are mechanically indexed and fully traceable, supporting audit-ready documentation under CAP and COLA accreditation frameworks.

Software & Data Management

As a manually operated mechanical microtome, the HMT-2258 does not incorporate embedded firmware or digital control interfaces. However, it is fully compatible with laboratory information management systems (LIMS) and digital pathology platforms via external annotation workflows. Each unit ships with a calibrated thickness verification certificate traceable to NIST standards, and optional accessories—including micrometer-calibrated specimen orientation gauges and blade angle measurement templates—support documented calibration intervals per internal QA protocols. The absence of electronic components ensures immunity to electromagnetic interference and eliminates software validation burdens under FDA 21 CFR Part 11 when used in regulated GMP environments.

Applications

• Routine diagnostic histology: Hematoxylin and eosin (H&E) staining of formalin-fixed, paraffin-embedded (FFPE) tissues in hospital pathology labs.
• Research-grade serial sectioning for 3D reconstruction, electron microscopy (EM) grid preparation, and spatial transcriptomics sample generation.
• Quality control of tissue processing: evaluation of infiltration, clearing, and embedding efficacy through systematic thickness profiling.
• Preclinical toxicology: standardized sectioning of rodent organ blocks for histopathological review in OECD 407 and ICH S5(R3)-aligned studies.
• Training and education: robust mechanical feedback and intuitive ergonomics make it suitable for teaching microtomy fundamentals in university histotechnology programs.

FAQ

Is the HMT-2258 compatible with cryostat-mounted operation?
No—it is a standalone room-temperature rotary microtome and is not designed for integration with cryogenic stages or refrigerated chambers.
What maintenance schedule is recommended for optimal long-term accuracy?
Monthly inspection of guide rail lubrication, biannual recalibration of the thickness dial using certified gauge blocks, and annual torque verification of all stage-locking mechanisms are advised per Ted Pella’s technical bulletin TB-MIC-2258-REV3.
Can the specimen stage accommodate oversized blocks beyond standard 30 × 40 mm cassettes?
Yes—the horizontal travel of 28 mm and vertical travel of 60 mm support custom blocks up to 50 × 60 mm when mounted on optional extended-specimen holders (accessory kit HMT-STG-XL).
Does Ted Pella provide installation qualification (IQ) or operational qualification (OQ) documentation?
Yes—upon request, Ted Pella supplies customizable IQ/OQ templates aligned with ISO/IEC 17025 and USP guidelines, including mechanical verification checklists and tolerance acceptance criteria.
Are replacement parts such as lead screws and roller guides available separately?
Yes—all critical wear components—including the ground stainless-steel lead screw, sealed roller bearings, and hardened aluminum stage plates—are stocked globally and supplied with serialized traceability documentation.