Secondhand Console Type Pulse Oximeter Nellcor N-550

Objective AI Report

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Report date: 31.10.2025

Nellcor N-550 Pulse Oximeter Analysis Report

Overview and Product Description

The device shown in the visuals is a Nellcor N-550 model pulse oximeter. This device is used to continuously and non-invasively monitor patients’ functional oxygen saturation of arterial hemoglobin (SpO2) and pulse rate. The front panel of the device features digital displays for SpO2 and pulse values, LED lights indicating alarm status and battery level, and control buttons. On its upper part, there is a quick guide label explaining the basic functions. The overall structure of the product indicates its suitability for use in medical environments.

The products covered by this report are as follows:

• 1 Nellcor N-550 Pulse Oximeter main unit
• 1 sensor connection cable

Physical Condition and Deformation Analysis

The general condition of the device has been evaluated as used. There is a slight yellowing on its casing, especially on the plastic components, which may occur over time. However, its overall condition is good. No significant scratches, dents, or cracks are observed on the device’s surfaces. The screen protector and labels on the front panel are legible and in place. The device’s carrying handle is part of the casing and has a robust appearance.

Mechanical and Electronic Evaluation

No issues have been detected in the mechanical components. All buttons on the front panel are in place and in good physical condition. The ventilation fan and grill on the back of the device appear clean and undamaged. Electronically, the device is not shown in working condition in the visuals, therefore, no comment can be made regarding the functionality of its screen or internal components. However, the connection ports (sockets) on the front and rear panels are physically in good condition; no bent or damaged pins are observed.

Accessories and Connection Ports

A connection cable, understood to belong to an SpO2 sensor, is present with the product. There are no signs of crushing, wear, or damage on the exterior of the cable and its connectors. The rear panel of the device features a serial (DB9) port and a power input. No external power adapter or cable is visible in the images. The front panel has a dedicated input for the SpO2 sensor.

Label Information and Guide

On the upper part of the device, there is a label titled “N-550 Quick Guide“. This label schematically explains how to use the device’s basic functions (e.g., power on/off, alarm silence, setting alarm limits). The meanings of the LED indicators (e.g., AC Power, Low Battery, Pulse Search) are also specified in this guide. The resolution of the visuals is insufficient to read detailed label information such as the serial number, REF code, or lot number on the device’s rear panel.

Battery Status

The “Low Battery Indicator” on the device’s front panel and the quick guide on the upper panel indicate that the device has an internal battery. However, from the visuals, no assessment can be made regarding the battery’s lifespan, capacity, or physical condition (e.g., swelling, leakage).

Potential Failure Risk

Based on visual inspections, no significant malfunction or damage has been detected in the device. The casing integrity, buttons, and connection points appear problem-free. Apart from a slight discoloration observed due to the device’s age, no serious wear and tear that would impede its use or lead to imminent failure has been observed. The only unknown factor is the condition of the internal battery, which may have been unused for a long time. Nevertheless, the device’s overall condition is quite good.