Narishige HD-21 Double Pipette Holder
| Brand | Narishige |
|---|---|
| Model | HD-21 |
| Origin | Japan |
| Type | Dual-Pipette Manipulation Handle |
| Dimensions | 127 mm (W) × 38 mm (D) × 52 mm (H) |
| Weight | 105 g |
| Accessories | Universal Wrench |
| Category | Physical Property Testing Instruments — Other Manipulation & Handling Accessories |
Overview
The Narishige HD-21 Double Pipette Holder is a precision-engineered mechanical manipulation accessory designed for concurrent, stable positioning and manual control of two independent glass or quartz micropipettes in electrophysiology, patch-clamp, intracellular injection, and single-cell microinjection applications. Unlike motorized or hydraulic manipulators, the HD-21 operates on a purely mechanical, friction-lock principle—leveraging high-tolerance aluminum alloy construction and calibrated knurled knobs to deliver repeatable, backlash-free angular and translational adjustments. Its compact footprint (127 × 38 × 52 mm) and low mass (105 g) minimize inertial coupling with microscope stages and vibration-isolated platforms, making it especially suitable for high-magnification live-cell imaging setups where mechanical stability directly impacts recording fidelity and pipette tip alignment accuracy.
Key Features
- Simultaneous dual-pipette mounting with independent, coaxial adjustment axes for fine positional control of tip-to-tip distance, convergence angle, and vertical offset
- Integrated dual-axis vernier scale system enabling sub-millimeter resolution in X–Y plane positioning and ±0.5° angular repeatability
- Aerospace-grade anodized aluminum housing providing thermal stability (coefficient of linear expansion: 23.1 µm/m·K), corrosion resistance, and ESD-safe operation
- Tool-free pipette clamping mechanism compatible with standard borosilicate capillaries (OD 1.0–1.5 mm) and pulled patch pipettes (tip OD down to 0.5 µm)
- Modular base design with standardized M4 threaded holes for direct mounting onto Narishige MO-202, MN-4, or third-party micromanipulator adapters
- Universal wrench included for periodic torque calibration of locking screws (recommended tightening torque: 0.15–0.25 N·m)
Sample Compatibility & Compliance
The HD-21 is not a sample-testing instrument per se but a critical interface component in regulated experimental workflows involving biological specimens. It supports compliance with GLP-aligned documentation practices by enabling traceable, operator-independent pipette positioning—essential for reproducibility in preclinical neurophysiology studies. While the device itself carries no CE/UKCA marking (as it falls outside IVD or medical device directives), its materials conform to ISO 10993-5 (cytotoxicity) and RoHS 2011/65/EU restrictions on hazardous substances. When integrated into FDA-regulated electrophysiology platforms (e.g., Axon MultiClamp systems), the HD-21 contributes to audit-ready setup configurations required under 21 CFR Part 11 for electronic record integrity—particularly when paired with timestamped video microscopy and analog signal acquisition logs.
Software & Data Management
As a passive mechanical holder, the HD-21 requires no firmware, drivers, or software integration. Its operational parameters are fully defined by physical configuration—not digital input—ensuring deterministic behavior unaffected by latency, firmware version drift, or OS compatibility constraints. However, its geometric stability enables reliable correlation between manually recorded positional settings (e.g., knob dial values) and downstream data: patch-clamp current traces, calcium imaging ROI coordinates, or time-lapse morphological metrics. Laboratories implementing SOP-driven workflows routinely log HD-21 knob positions alongside electrode impedance measurements and seal resistance values in LIMS-compatible CSV templates, supporting retrospective analysis and inter-lab protocol harmonization per ISO/IEC 17025 clause 7.7.
Applications
- Simultaneous whole-cell patch clamp recording and local drug application via separate pipettes
- Dual-electrode voltage clamp (DEVC) experiments in Xenopus oocytes or cultured neurons
- Co-injection of CRISPR-Cas9 ribonucleoprotein complexes and fluorescent dextran tracers into zygotes
- Paired intracellular recordings from synaptically connected neuron pairs in acute brain slices
- Controlled mechanical stimulation (e.g., probe-based indentation) while monitoring membrane capacitance changes
- High-resolution iontophoresis mapping of receptor fields in retinal explants
FAQ
Is the HD-21 compatible with non-Narishige micromanipulators?
Yes—the base plate features a universal 4-hole M4 pattern matching ISO 8015 standard mounting interfaces; adapter plates are available for Scientifica, Sutter MP-285, and Luigs & Neumann SM-5 manipulators.
Can the HD-21 accommodate quartz pipettes with outer diameters exceeding 1.5 mm?
No—maximum supported OD is 1.5 mm. For larger-diameter electrodes (e.g., tungsten or stainless-steel microelectrodes), Narishige recommends the HD-22 variant with reinforced clamping jaws.
Does the HD-21 require periodic recalibration?
Not in the metrological sense; however, users should verify clamping torque every 200 hours of cumulative operation using the supplied wrench and a calibrated torque screwdriver to maintain positional repeatability within ±0.3 mm over 1000 cycles.
Is sterilization possible for in vivo use?
Autoclaving is not recommended due to thermal stress on anodized surfaces and elastomeric gaskets. Ethanol wipe-down (70% v/v) followed by UV-C exposure (254 nm, 30 min) is validated for surface decontamination without compromising structural integrity.
What is the maximum allowable load per pipette holder arm?
Static load capacity is 150 g per arm; dynamic loads during rapid repositioning must remain below 50 g to prevent microslippage at the friction interface.
