Secondhand Healthcair GK420G M-113900-EE CPAP Device with Humidifier

Objective AI Report

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Report date: 14.02.2026

Tyco Healthcare Puritan Bennett GoodKnight 420G and H2O Analysis Report

Device Identification

The product shown in the images is a respiratory support device used for medical purposes. The product is seen as a single unit formed by the combination of two main components: a main control unit (CPAP device) in the upper part and a heated humidifier unit integrated into this device in the lower part.

Brand and Model

Upon detailed examination of the writings and logos on the product, the following definitive identifications have been made:

• Main Device Brand: On the left side of the panel, the labels Tyco Healthcare and on the right side, Puritan Bennett are clearly legible.
• Main Device Model: The writing GoodKnight 420G is located at the top center of the control panel.
• Humidifier Unit Model: The label GoodKnight H2O is present on the front face of the transparent water chamber in the lower part.

Areas of Use

This device is generally a CPAP (Continuous Positive Airway Pressure) machine used in the treatment of Sleep Apnea (Obstructive Sleep Apnea Syndrome). It delivers pressurized air to the patient to keep the airways open during sleep. The H2O unit in the lower part is designed to humidify this air to prevent the drying of the respiratory tracts. It is suitable for home medical use.

Authenticity

The print quality, logo placements, keypad design, and industrial design features on the device indicate that the product is an original Puritan Bennett production. The labeling and material quality appear to be consistent with medical device standards.

Overall Condition

It is clear that the displayed device is used. It is not in “new” or “mint” condition. There are noticeable signs of use and wear on the device. There is dirt present on its outer surface.

Physical Deformation and Cosmetic Examination

During the physical examination conducted via the images, the following details are noticeable:

• Casing Dirtiness: Especially on the base (lower grey plastic) part of the device and around the edges of the water chamber’s housing, black stains and scuff marks are present. Dust and dirt accumulation are observed at the joints.
• Color Condition: A slight discoloration (yellowing) that may occur over time can be observed on the upper plastic casing, but this could also be due to lighting.
• Transparent Components: The water chamber is made of transparent plastic but may contain opaqueness or cloudiness similar to limescale stains due to use. It is not completely clear.
• Cracks/Fractures: No deep cracks or fractures that would affect functionality have been detected on visible surfaces; deformations are superficial and primarily cosmetic.

Quantity Information

The images show 1 unit of the main device (GoodKnight 420G and H2O chamber combined) in an integrated form.

Mechanical and Electronic Components

Visual analyses regarding the mechanical and electronic structure of the device are as follows:

• Keypad: There are 3 physical buttons on the front face of the device. The button symbols are legible, but there is slight dirt accumulation around the buttons.
• Screen: The device has a small LCD screen. Since the device is off, it is not possible to determine from the image whether the screen is functional (dead pixels, etc.). There are no visible cracks on the screen.
• Water Chamber: The GoodKnight H2O humidifier chamber is in place. Air intake and outlet ports appear clear.

Accessories and Missing Parts

As a result of the product analysis in the image, essential accessories required for its use are found to be missing:

• Power Cable (Adapter): The power adapter and cable required for the device’s electrical connection are not present in the images.
• Hose and Mask: The hose (tubing) and face mask necessary for patient use are not present in the image.
• Carrying Case: Not available.

Label and Text Information

The technical and instructional texts legible on the device are as follows:

• Brand/Model Texts: “GoodKnight 420G”, “GoodKnight H2O”, “tyco Healthcare”, “Puritan Bennett”.
• Level Indicator: At the bottom of the water chamber, there is a black MAX line and text indicating the maximum water level.
• Icons Around the Screen: Functional icons such as “Ramp” (slanted triangle), “Setting/Decrease” (inverted triangle), and “Start/Set” (symbol within a circle) are visible above the buttons.

Battery Status

This model (GoodKnight 420G) is a device that operates with an external power source (adapter). There is no indication or sign of an internal battery in the image. A portable battery unit is also not attached.

Potential Malfunction Risk

Based on the images, the potential risks identified are as follows:

• Hygiene Risk: The humidifier section and airways of the device are directly related to respiration. The dirt on the exterior and at the joints of the product suggests that the interior of the device or the water chamber may require sterilization. Using it without cleaning may not be hygienically appropriate.
• Water Sealing: The seals of the water chamber cannot be clearly discerned in the image; however, considering the age and general wear of the device, the possibility that the rubber seals may have lost their properties should be taken into account.

Documents and Warranty

No documents such as an invoice, warranty certificate, or user manual are present in the images.