Active vacuum socket suspension system
An overview of the working principle and supportive role of a suspension approach that creates continuous negative pressure between the residual limb and the socket.
What is active vacuum suspension?
Active vacuum suspension is a socket attachment approach that aims to create a continuous negative-pressure environment by drawing the air out of the space between the residual limb and the socket. This environment is intended to help the prosthesis stay on the limb more stably.
The mechanism that creates the pressure manages the air exchange that occurs during the gait cycle and can help maintain the connection throughout the day. The suitability of the system is determined solely by the assessment of the physician and the clinical team, according to factors such as the condition of the residual limb and the person's activity level.
How is negative pressure created?
The residual limb is usually covered with a soft liner; the space between the socket and the liner is kept airtight. A pump or mechanical device evacuates the air in this space, creating a pressure inside that is lower than the outside environment and providing a hold that gently draws the limb into the socket.
- Creating a closed volume of air with a liner and an airtight seal
- Evacuating the air from this volume by means of the device
- Balancing the pressure throughout the step in an effort to maintain the connection
Key aspects of the approach
The headings below are for general information; individual results vary according to the person and the clinical assessment.
Adapting to volume changes
It is intended to help stabilize the connection when small changes in residual limb volume occur during the day.
Skin–socket contact
It works toward more consistent contact between the limb and the socket; this can help in managing load distribution.
Perception of movement
The stable position of the limb inside the socket can support feedback about the position of the prosthesis during the step.
Components of the system
An active vacuum setup usually consists of several parts working together. The components are selected by the clinical team.
Liner
The soft intermediate layer that encloses the residual limb acts as a cushion between the skin and the socket and contributes to the airtight seal.
Socket and suspension unit
The socket shaped to the limb and the device that evacuates the air work together with the aim of maintaining the connection.
The fitting process
Physician's Assessment
The fitting begins with a specialist physician's assessment and a prescription/medical report.
Measurement and Trial
The condition of the residual limb is assessed; the suitable liner, socket and suspension approach are planned.
Fitting and Adjustment
The system is fitted; the seal and pressure settings are adjusted to the individual.
Follow-up
Training on use is given; regular follow-up is provided for check-ups and, when necessary, adaptations.
Frequently asked questions
Is active vacuum suspension suitable for everyone?
Suitability depends on factors such as the condition of the residual limb, skin health and activity level, and is determined solely through an assessment by the physician and the clinical team.
Does the system require maintenance throughout the day?
It is recommended that the seal and the condition of the liner be reviewed regularly. Care and the manner of use are explained by the clinical team.
How does it differ from other suspension methods?
Active vacuum tries to maintain the connection with continuous negative pressure. Which approach is suitable is assessed individually; the suitable method may differ from person to person.
This content is for information purposes; please consult your physician for diagnosis and treatment. Fittings are carried out at our licensed center locations in line with a specialist physician's prescription/medical report.
