Pin-lock socket suspension system
An overview of the suspension approach that creates a mechanical connection when the pin at the end of the liner engages the locking mechanism at the base of the socket.
What is pin-lock suspension?
Pin-lock suspension is a socket suspension approach that creates a mechanical connection when a pin at the end of the liner worn on the residual limb engages the locking mechanism at the base of the socket. The connection relies on direct physical locking rather than air pressure.
With this method, putting on and taking off the prosthesis is usually easy and intuitive; the sound heard and the click felt when the pin engages the lock provide feedback that the connection has been made. The suitability of the system is determined only through the assessment of the physician and the clinical team, according to the condition of the residual limb and the person's needs.
How does pin-lock work?
The residual limb is first covered with a soft liner. As the prosthesis is put on, the pin attached to the end of the liner advances into the locking slot at the base of the socket and gradually engages the toothed mechanism. This creates a fixed mechanical bond between the limb and the socket.
To remove it, the release button on the socket is pressed; this opens the lock and allows the pin to come out of the slot. Regular checking of the connection and care of the liner are important for using the system safely.
Key aspects of the approach
The headings below are for general information; individual results vary depending on the person and the clinical assessment.
Intuitive use
The pin engaging the lock and release by button are intended to make putting on and taking off easy to understand.
Verifiable connection
The sound and feel during locking provide tangible feedback that the connection has been made.
Mechanical suspension
Since the connection relies on a direct mechanical lock rather than air pressure, it is simple in structure.
Access for maintenance
The liner and pin are components that are relatively easy to access for checking and cleaning.
Wide range of use
A commonly used suspension option that can be considered at different activity levels.
Component compatibility
Planning a suitable liner, pin and locking mechanism together supports the function of the connection.
Related suspension approaches
There is no single method for socket suspension; which approach is suitable is assessed individually.
Active vacuum suspension
An alternative approach that aims to maintain the connection by creating continuous negative pressure between the residual limb and the socket.
Learn more
Use in daily activities
The suspension approach is chosen taking into account the person's daily activity level and needs.
The application process
Physician's Assessment
The application begins with a specialist physician's assessment and prescription/medical report.
Measurement and Trial
The condition of the residual limb is assessed; a suitable liner, pin and locking mechanism are planned.
Fitting and Adaptation
The system is fitted; lock alignment and fit adjustments are made according to the individual.
Follow-up
Training in use is provided; regular follow-up is provided for check-ups and adjustments when necessary.
Frequently asked questions
Who is pin-lock suspension suitable for?
Suitability depends on factors such as the shape and condition of the residual limb, skin health and activity level, and is determined only through the assessment of the physician and the clinical team.
Is the locking sound normal?
The click heard as the pin engages the lock is expected feedback showing that the connection has been made. If unusual sounds or looseness are noticed, the clinical team should be contacted.
How should the liner be cared for?
Regular cleaning and inspection of the liner and pin are recommended. The method and frequency of care are explained by the clinical team.
This content is for informational purposes; please consult your physician for diagnosis and treatment. Applications are carried out at our licensed center locations in line with a specialist physician's prescription/medical report.
