NARISHIGE H-7 Pipette Holder
| Brand | NARISHIGE |
|---|---|
| Origin | Japan |
| Model | H-7 |
| Material | Stainless Steel & High-Performance Polymer |
| Balance Rod Diameter × Length | 4 mm × 100 mm |
| Total Length | 120 mm |
| Weight | 10 g |
| Mounting Type | Standard 3-Rail Micromanipulator Compatibility (e.g., MO-10, MN-151) |
| Clamping Range | 0.5–2.0 mm OD Glass Capillaries & Borosilicate Pipettes |
Overview
The NARISHIGE H-7 Pipette Holder is a precision-engineered mechanical fixture designed for stable, repeatable positioning of glass micropipettes in electrophysiology, patch-clamp, microinjection, and single-cell manipulation setups. It operates on a passive clamping principle—utilizing calibrated spring tension and conformal arc-shaped jaws—to secure pipettes without slippage or torsional deformation. Unlike adhesive or friction-based mounts, the H-7 relies on geometric constraint and material-specific surface contact to maintain axial alignment under dynamic load conditions typical during electrode advancement or pressure application. Its compact 120 mm total length and 10 g mass minimize inertial coupling with adjacent manipulators, ensuring minimal interference in high-resolution positioning systems. The 4 mm diameter × 100 mm long balance rod is compatible with standard NARISHIGE three-rail micromanipulator tracks (e.g., MO-10, MN-151), enabling seamless integration into established rig architectures.
Key Features
- Optimized jaw geometry with radius-matched curvature for 0.5–2.0 mm outer-diameter borosilicate and quartz pipettes—ensuring uniform radial force distribution and eliminating point-loading-induced fracture.
- Stainless steel structural frame combined with wear-resistant polymer contact surfaces to prevent scratching of pipette shafts while maintaining long-term dimensional stability.
- Tool-free, one-handed clamp actuation mechanism allowing rapid pipette exchange without compromising positional repeatability (< ±2 µm axial deviation across 50 insertion cycles).
- Low-profile design (max height: 28 mm) facilitating unobstructed optical access in inverted microscope configurations and compatibility with stage-top incubators.
- Pre-aligned mounting interface ensures coaxial registration with manipulator translation axes—critical for minimizing lateral drift during fine-step advancement in voltage-clamp experiments.
Sample Compatibility & Compliance
The H-7 accommodates standard pulled and fire-polished glass micropipettes used in intracellular recording, whole-cell patch clamp, and iontophoresis applications. It is routinely deployed in GLP-compliant neurophysiology laboratories where equipment traceability and mechanical consistency are documented per ISO/IEC 17025 requirements. While the device itself carries no electrical certification, its non-conductive polymer components and absence of active electronics render it suitable for use in Faraday cages and low-noise recording environments. All materials comply with RoHS Directive 2011/65/EU and are free from phthalates and halogenated flame retardants—supporting laboratory chemical safety protocols.
Software & Data Management
As a purely mechanical holding device, the H-7 requires no firmware, drivers, or software integration. Its performance is independent of digital control systems, eliminating latency, calibration drift, or cybersecurity dependencies common in motorized alternatives. This analog architecture supports audit-trail integrity in regulated environments: physical setup parameters (e.g., pipette angle, clamping position, manipulator coordinates) are manually recorded in lab notebooks or LIMS entries without software-mediated metadata generation. For labs operating under FDA 21 CFR Part 11, the absence of electronic records simplifies validation—no electronic signature or audit log functionality is required or implemented.
Applications
- Stable fixation of patch-clamp electrodes during gigaseal formation and membrane rupture protocols.
- Secure mounting of injection pipettes in zebrafish or C. elegans embryonic microinjection rigs.
- Supporting dual-pipette configurations (e.g., recording + stimulation) on dual-manipulator stages.
- Positioning capillary tubes in microfluidic interface assemblies requiring precise vertical alignment relative to PDMS channels.
- Temporary immobilization of fragile quartz pipettes during laser-assisted cell ablation or optogenetic probe calibration.
FAQ
Is the H-7 compatible with non-NARISHIGE micromanipulators?
Yes—when paired with universal adapter plates (e.g., Sutter Instrument MP-200 mounting brackets), the H-7’s standardized 3-rail interface can be retrofitted to Sutter, Scientifica, or Luigs & Neumann systems.
Can the clamping force be adjusted?
No—the spring tension is factory-set to deliver optimal grip without pipette deformation; manual adjustment would compromise repeatability and void calibration documentation.
Does the H-7 support heated or cooled pipettes?
It is rated for ambient operation only (15–30°C); prolonged exposure to thermal gradients >±5°C may affect polymer jaw elasticity and clamping consistency.
What maintenance is required?
Wipe contact surfaces with 70% ethanol after each use; inspect jaw edges quarterly for micro-scratches using 10× magnification—replace if visible wear exceeds 5 µm depth.
Is sterilization possible?
Autoclaving is not recommended; however, ethylene oxide (EtO) gas sterilization and UV-C (254 nm, 30 min) are validated methods per ISO 14937 for reuse in aseptic procedures.
