Secondhand Ottobock 6A20=20 Leg Orthosis

Objective AI Report

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Report date: 12.01.2026

Ottobock 6A20=20 Mechanism Prosthetic Leg System Analysis Report

Device Identification

The product analyzed in the visuals is a modular prosthetic leg system consisting of a socket, a lock mechanism (shuttle lock), a pylon (tube), and a foot component, used to enable mobilization for amputee individuals. The product is a medical orthopedic aid that includes mechanical connection points and locking systems.

Brand and Model

As a result of a detailed examination of the label located on the product’s connection and lock mechanism, brand and model information has been identified with 100% certainty.

• Brand: Ottobock
• Model/Reference Code: 6A20=20

Note: The 6A20=20 code on the label indicates Ottobock’s lamination anchor and lock system (shuttle lock). The product is considered a complete system built upon this mechanism.

Originality

Upon examination of the font of the “ottobock.” logo on the product, the material quality of the label, technical details of the laser printing (torque values and warning icons), and the product’s workmanship details; it is concluded that the part in question is an original Ottobock production. Furthermore, the “MD” (Medical Device) inscription and CE mark on the label confirm that the product is a medical device compliant with European standards.

Areas of Use

This product is used to help patients who have undergone lower extremity amputation regain their walking functions. The structure of the system in the visual includes a lock mechanism (shuttle lock) that connects the socket (stump receptacle) to other parts of the prosthesis and is used with a pin system. This mechanism ensures the stump securely attaches to the prosthesis for patients using a silicone liner. It is suitable for use in physical therapy and rehabilitation, as well as in orthopedics.

Quantity Information

In the visuals, there is 1 unit of a fully assembled prosthetic leg (socket, mechanism, pylon, and a foot with a shoe). (Note: Although a very small part of a similar socket structure is visible in the background of visual 5, the focal point and the product analyzed is a single unit).

General Condition

The device is a used product. The color of the socket part and slight yellowing on the plastic connection components indicate that the product has been used for a certain period. However, its general condition appears clean, and its structural integrity has been preserved. No missing parts are apparent.

Physical Deformation

No significant rusting or deep scratches have been observed on the product’s metal components. The black anodized metal sections (upper connection part) are in clean condition. However, the following minor signs of use are present:

• Natural color changes (slight yellowing) that can occur over time are present on the white plastic parts under the mechanism (the area where the pin release mechanism is located).
• Surface dullness due to use may be present on the socket (beige-colored hard part), but no cracks or fractures have been detected.

Mechanical Components

The mechanical parts appear sound. The pin release mechanism of the lock system (shuttle lock) is visible with its protruding cord/cable system. No signs of looseness or breakage are visible in the spring systems or screw connection points. The pylon (leg tube) is straight and shows no bending.

Accessories

On the device, there is a black, laceless, leather-like shoe worn to protect the prosthetic foot for daily use. Additionally, the cord/cable assembly used to release the lock system is mounted on the mechanism. External accessories such as a box, user manual, or spare pin are not present in the visuals.

Label Information and Technical Details

The data on the technical label (Visual 6) on the product are as follows:

• Brand: ottobock.
• Reference Code: 6A20=20
• Torque Value (Upper Connection): 20 Nm (Indicates that it should be tightened with 20 Newton-meters of torque).
• Torque Value (Lower Connection): 15 Nm (Indicated near the adjustment screw).
• LOT Number: LOT 0461202422 (Indicates the production batch).
• Carrying Capacity: max. 125kg / 275lbs (User weight limit).
• Certifications: CE Mark, MD (Medical Device) logo.

Size and Compatibility

The label on the product states the maximum user weight as 125 kg (275 lbs). This information indicates that the product is suitable for adult use and resistant to heavy loads. Although body or length measurements cannot be fully determined from the visual, it can be stated that it is of standard adult dimensions.

Existing Defects and Potential Risks

No apparent breakage, detachment, or missing parts (existing defects) that would hinder the device’s operation have been detected in the visuals. As a potential risk, given that the product is used, it should be considered that the internal lock mechanism (springs and gears) may require maintenance over time due to metal fatigue or lack of lubrication. However, from a visual perspective, the product appears to be in good and usable condition.