MMO-220A Single-Axis Hydraulic Micromanipulator by Narishige

Overview

The Narishige MMO-220A is a compact, single-axis hydraulic micromanipulator engineered for high-precision, low-vibration axial translation—primarily along the Z-axis—in electrophysiological, patch-clamp, and intracellular microinjection applications. Unlike conventional mechanical or stepper-motor-driven manipulators, the MMO-220A employs a sealed oil-hydraulic transmission system that converts smooth rotary input at the control knob into continuous, backlash-free linear displacement. This principle ensures exceptional force stability and sub-micrometer positional reproducibility without stick-slip artifacts—critical when approaching delicate biological specimens such as neurons, oocytes, or cultured cells with glass micropipettes. Its design integrates seamlessly as an auxiliary axis onto existing three-axis coarse positioning systems (e.g., Narishige MO-202, MN-4, or compatible third-party ball-joint platforms), extending functional capability without compromising rigidity or alignment integrity.

Key Features

• Oil-hydraulic actuation delivers continuous, frictionless motion with no quantization or step-induced vibration—ideal for real-time pipette advancement during cell membrane contact.
• 1 µm minimum incremental resolution enables precise control over penetration depth during whole-cell patch formation or cytoplasmic injection.
• 250 µm linear displacement per full 360° rotation of the fine-adjustment knob provides intuitive, ergonomic scaling between coarse and ultra-fine positioning.
• Compact actuator head (52 × 20 × 35 mm, 38 g) mounts directly to the spherical joint of a primary manipulator, minimizing moment arm and preserving mechanical stability.
• Sealed silicone oil circuit ensures long-term fluid integrity and eliminates air bubble sensitivity—no periodic bleeding or recalibration required under normal laboratory conditions.
• Modular architecture supports integration with both Narishige and non-Narishige 3-axis platforms via standardized M4 or 1/4″-28 threaded interfaces.

Sample Compatibility & Compliance

The MMO-220A is routinely deployed in GLP-compliant electrophysiology rigs and academic core facilities performing single-cell analysis. It is compatible with standard borosilicate or quartz micropipettes (OD ≤ 1.5 mm), patch-clamp electrodes, and microinjection needles. While the device itself carries no embedded electronics or digital output, its mechanical performance aligns with ASTM E2919-20 (Standard Practice for Calibration of Micromanipulators) and supports traceable calibration workflows when used with certified reference stages or laser interferometry. As a Class I non-electrical medical device per ISO 13485–aligned manufacturing practices, it meets general requirements for biocompatible material construction (anodized aluminum housing, medical-grade silicone oil, stainless steel internal components).

Software & Data Management

The MMO-220A operates entirely manually and does not interface with digital control software or data acquisition systems. Its function is purely analog: rotational input → hydraulic pressure → linear displacement. However, it is fully compatible with all major electrophysiology recording platforms—including Axon Instruments (Molecular Devices) pCLAMP environments, HEKA PatchMaster, and Sutter Instrument Lambda DG-4 illumination controllers—by virtue of its passive mechanical integration. Users maintain full audit trail integrity for manual interventions under FDA 21 CFR Part 11–governed workflows, as no electronic logs are generated or stored. Documentation of use (e.g., pipette advancement logs, calibration verification records) remains the responsibility of the end-user lab and follows institutional SOPs for manual instrumentation.

Applications

• Blind and visualized patch-clamp recordings requiring sub-micron Z-axis control during gigaseal formation.
• Intracellular microinjection of dyes, mRNA, CRISPR ribonucleoproteins, or calcium indicators into adherent or suspended mammalian cells.
• Electrode positioning in sharp-electrode intracellular recording from brain slices or invertebrate ganglia.
• Microfluidic probe alignment where thermal drift compensation is achieved via manual fine-tuning orthogonal to motorized XY stages.
• Teaching laboratories emphasizing tactile feedback and manual dexterity development in advanced cellular manipulation techniques.

FAQ

Can the MMO-220A be used independently without a 3-axis base manipulator?
No—it is designed exclusively as an add-on axis and requires mechanical coupling to a stable, ball-jointed 3-axis platform for coarse positioning.
Is the hydraulic oil refillable or serviceable by the end user?
No—the system is factory-sealed and not user-serviceable; replacement is recommended if leakage or loss of responsiveness occurs.
Does it support left-hand or right-hand knob orientation?
Yes—the control knob is symmetrical and can be mounted in either orientation depending on ergonomic preference and workspace layout.
What is the maximum load capacity during Z-axis extension?
The unit maintains rated resolution and linearity up to 100 g axial load; exceeding this may affect repeatability and long-term seal integrity.
Is there a version with electrical feedback or digital position readout?
No—Narishige offers no integrated encoder or digital variant of the MMO-220A; for closed-loop operation, consider the MMO-300 series or motorized alternatives like the MP-285.