NARISHIGE MO-8HL Long Electrode Holder

Overview

The NARISHIGE MO-8HL Long Electrode Holder is a precision-engineered mechanical accessory designed for electrophysiological and microinjection applications requiring extended reach and stable electrode positioning. Unlike active instrumentation, the MO-8HL functions as a passive, rigid mounting interface—engineered to maintain mechanical integrity and positional fidelity during delicate manipulations under high-magnification microscopy. Its core function is to extend the effective working length of standard micromanipulator-mounted electrodes by replacing shorter holders (e.g., MO-10 and MDO-84), thereby enabling precise access to deep or recessed sample regions—such as intact brain slices, embryonic tissues, or organotypic cultures—without compromising stability or introducing vibration coupling. Constructed from high-grade anodized aluminum alloy, the holder exhibits low thermal expansion, non-magnetic properties, and resistance to corrosion from common laboratory solvents and saline solutions, ensuring long-term dimensional stability in humidified incubator environments or wet-cell setups.

Key Features

• Extended reach capability: Increases total electrode assembly length to 170 mm when integrated with compatible NARISHIGE manipulators and holders, facilitating access to anatomically deep or spatially constrained specimens.
• Ultra-lightweight design: Weighs only 50 g—minimizing load on micromanipulator axes and reducing drift caused by gravitational torque during fine-positioning tasks.
• Compact footprint: Dimensions of 31.5 mm (width) × 10 mm (depth) × 75 mm (height) ensure compatibility with crowded rig configurations, including multi-electrode patch-clamp stations and dual-pipette injection systems.
• Standardized mechanical interface: Features NARISHIGE’s proprietary 3/8″-24 UNF threaded base and universal clamp groove geometry, ensuring seamless integration with MO-10, MMO-10, and other NARISHIGE micromanipulator series.
• Passive thermal and electrical isolation: Non-conductive anodized surface layer prevents stray current paths and minimizes heat transfer between manipulator body and electrode shaft—critical for temperature-sensitive recordings or laser-assisted procedures.

Sample Compatibility & Compliance

The MO-8HL is routinely deployed in neuroscience, developmental biology, and single-cell physiology workflows where reproducible electrode depth control is essential. It supports glass micropipettes (1.0–1.5 mm OD), metal microelectrodes (e.g., tungsten or platinum-iridium), and patch-clamp pipettes with standard taper profiles. Its design conforms to standard laboratory ergonomics and safety practices for Class I electrical equipment environments. While the holder itself carries no active electronic components, its use aligns with ISO 13485-aligned quality management frameworks when employed in GLP-compliant preclinical electrophysiology studies. No regulatory certification (e.g., CE, FDA 510(k)) applies, as it is classified as a non-powered laboratory accessory under IEC 61010-1 Annex BB.

Software & Data Management

As a purely mechanical component, the MO-8HL does not interface with software or generate digital data streams. However, its geometric consistency directly contributes to measurement traceability in quantitative electrophysiology experiments. When used in conjunction with NARISHIGE’s digital micromanipulators (e.g., MMO-202ND) or third-party motorized stages equipped with position encoders, the holder’s fixed length extension enables accurate calibration of Z-axis displacement values in µm-per-step calculations. Users are advised to document holder type and installed configuration in experimental metadata files per FAIR data principles (Findable, Accessible, Interoperable, Reusable), particularly in multi-lab collaborative projects governed by NIH or ERC data-sharing mandates.

Applications

• Whole-cell patch-clamp recordings from subcortical neurons in acute brain slices, where standard holders fail to achieve sufficient penetration depth without excessive pipette bending.
• Intracellular microinjection into zebrafish embryos at 24–48 hpf, where the extended reach allows angled insertion through chorion layers while maintaining optical clarity.
• Simultaneous dual-electrode voltage-clamp (SEVC) configurations requiring asymmetric electrode lengths for optimal signal-to-noise ratio and minimal capacitive coupling.
• Long-duration intracellular recording in perfused cardiac tissue preparations, where mechanical stability over >2-hour sessions reduces failure rate due to holder creep or thermal drift.
• Custom integration with automated patch-clamp platforms (e.g., Sophion QPatch, Nanion Patchliner), where holder length uniformity ensures consistent tip-to-sample distance across multi-well assays.

FAQ

Is the MO-8HL compatible with non-NARISHIGE micromanipulators?
Yes—provided the host manipulator accepts 3/8″-24 UNF threaded accessories and offers a compatible clamping mechanism; however, positional repeatability may vary without NARISHIGE’s proprietary kinematic alignment features.
Does the MO-8HL affect electrode capacitance or noise performance?
No—the holder introduces no additional conductive path or dielectric interface; measured input capacitance remains unchanged relative to baseline configurations using MO-10 or MDO-84.
Can it be sterilized for in vivo use?
Autoclaving is not recommended due to potential anodization degradation; ethylene oxide (EtO) gas or 70% ethanol wipe disinfection is validated for acute in vivo applications.
What is the maximum recommended electrode weight for stable operation?
For optimal stability with ≤0.5 µm positional drift over 10 minutes, electrode assemblies should not exceed 150 mg total mass—including pipette, holder, and adapter components.
Is technical support available for custom mounting adaptations?
NARISHIGE’s global application engineering team provides CAD-based mounting guidance and mechanical interface verification upon request—subject to regional distributor coordination.