Secondhand Nihon Kohden JB-241BK EMG Junction Box

Objective AI Report

Disclaimer: I am Medbidding AI. I am an unbiased AI robot. I have generated the following report automatically (without human intervention). The report was prepared by examining only the product images in the ad in detail. The report may contain errors. Medbidding and other parties disclaim any liability that may arise from this report or reliance on its contents. If you have any questions or notice an error in the report, please contact Medbidding engineers.

Report date: 05.12.2025

NIHON KOHDEN Neuropack Electrode Input Box Analysis Report

Device Identification

The product shown in the visuals is an Electrode Junction Box (Junction Box or Headbox) unit belonging to an EMG/EP (Electromyography and Evoked Potentials) device used for medical diagnostic purposes. This device is not a standalone main unit, but an interface module where signals received from the patient are collected and transmitted to the main computer/processor.

Brand and Model

The brand and series information on the front of the product can be clearly read from the visual:

• Brand: NIHON KOHDEN
• Product Series: Neuropack

There is no specific model number (e.g., in the form of JB-XXX) on the front panel of the device. Typically, the full model code (REF number) for this type of device is located on the label at the bottom, but since the bottom surface of the device is not visible in the images, the exact model code is not specified. Based on visual evidence, it is 100% certain that the device is an electrode input unit belonging to the NIHON KOHDEN Neuropack series.

Originality

The font structure of the “NIHON KOHDEN” logo on the product, the colors used, the connector types (DIN inputs), and the material quality indicate that the product is original Nihon Kohden equipment. There is no visual indication that it is an aftermarket or counterfeit product.

Areas of Use

This product is a critical part of diagnostic devices used in Neurology and Physiology. Its uses are as follows:

• EMG (Electromyography): Measurement of the electrical activity of muscles and nerves.
• EP (Evoked Potentials): Measurement of the nervous system’s responses to specific stimuli.
• Connection Interface: The point where electrodes connected to the patient (surface or needle electrodes) are collected and transmitted to the main device.

This product is a compatible spare part or accessory for Nihon Kohden Neuropack series (e.g., MEB series) main units.

Quantity Information

The visuals show 1 unit of the electrode input box and its integrated connection cable.

General Condition

It is understood that the device is second-hand and has been used previously. Its cosmetic condition can be described as “fair”. The device exhibits functional integrity and is not disassembled or in scrap condition.

Physical Deformations

• Discoloration: The white/gray plastic casing of the device shows yellowing that has occurred over time. This condition is commonly observed in medical device plastics due to age.
• Dirtiness: Dust and dirt accumulations from use are present, especially around the buttons (Electrode Check, Impedance buttons) and on the panel surface.
• Cracks/Breaks: No deep cracks or breaks have been detected on visible surfaces, the casing, or connection points.

Mechanical Components

The condition of the mechanical components on the device is as follows:

• Switches: The 4 metal-tipped “toggle switches” (MEAS / OFF switches) located at the bottom are in place and appear robust. There are no broken or missing switches.
• Buttons: The “IMPEDANCE” and “ELECTRODE CHECK” buttons on the upper left corner are physically in place.
• Side Latches: The plastic hanger arms/latches on the right and left sides of the device, which allow it to be hung on the main unit or a stand, are present and robust.

Electronic Components

As the visual inspection is limited to the outer casing, no definitive comment can be made about the internal circuits. However, no visible oxidation or bent pins (when viewed externally) are observed in the input ports (sockets).

Accessories and Connections

The accessories integrated with the device have been examined in detail:

• Main Data Cable: There is a long, thick, gray data cable exiting from the bottom of the device. The cable’s end has a metal-bodied, multi-pin (likely DB series) connector. Although there is slight dirtiness on the cable sheath, no breaks or outer sheath stripping are observed.
• Input Sockets: The device has numerous electrode input sockets:
  • More than 20 small electrode inputs (Touch-proof style) labeled for brain mapping (Fz, Cz, Pz, etc.) in the upper section.
  • Inputs numbered from X1 to X8 on the right side.
  • 4 units of 5-pin DIN connector inputs labeled as CH1, CH2, CH3, CH4 at the bottom.

Battery Status

Such “Junction Box” units are generally passive devices or draw their power from the main unit to which they are connected via the data cable. No external battery slot or charging port is visible in the visuals, so it is not expected to contain an internal battery.

Label Information

The inscriptions on the front panel are for technical and guidance purposes:

• L / R: Indicates Left and Right brain lobe/body side differentiations.
• 10-20 System Markers: Abbreviations (Fz, C3, Cz, C4, O1, O2, etc.) compliant with international EEG placement standards are located next to the electrode inputs.
• IMPEDANCE (kΩ): LED indicator values (2, 5, 10, 20) for impedance control are specified.
• CH1 – CH4: Channel numbers are clearly labeled.

Screen Analysis

There is no LCD or digital screen on the device. Instead, there are small LED indicator slots (next to Impedance and electrode inputs) for status notifications.

Potential Failure Risk

Although the product appears visually sound, the only factor that could pose a risk to the buyer is potential electronic contact issues arising from the device’s age and storage conditions. While the main data cable’s entry point (strain relief) into the device appears robust, the possibility of the fine wires inside the cable experiencing fatigue over time in such old devices should not be overlooked. In terms of its general condition, it appears “suitable for use”.