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Össur Unity Vacuum System: An Elevated Vacuum System for All Users

Posted by Bryan Potok, CPO on

An elevated vacuum system describes a style of suspension that prevents excessive motion and pistoning within your socket using a vacuum pump. To date, above-knee amputees have been left out of the prosthetic elevated vacuum revolution, not because they would not benefit from the technology. Instead, the fault lies in the existing systems—which have been dependent upon a sleeve to maintain vacuum—were not suitable for above-knee applications.  

 The Össur Unity Vacuum System is an elevated vacuum system that can accommodate all types of prosthetic users.

Össur boasts "Unity for All" with their Unity Sleeveless Vacuum System. There is finally an elevated vacuum system for all prosthetic users. Whether an above-knee or below-knee, low active, or high active, mechanical, or microprocessor solution, the Unity Sleeveless Vacuum System offers the flexibility to combine a variety of Össur feet and knees to achieve the optimal combination of equipment for each unique user. 

Most stable suspension

Össur’s latest sleeveless vacuum system also makes for one of the most stable prosthetic suspension systems ever produced. In comparison to a vacuum system that employs a prosthetic sleeve, the Unity is not laden with restrictions that may occur with a sleeved suspension. Generally, users report a greater feeling of stability and confidence with the Unity over other suspension technologies, including suction.

A first-of-its-kind vacuum system

The Unity is also a first-of-its-kind vacuum system that pulls the vacuum in the socket using the energy created by the natural motion of the prosthetic foot. The heel pad and the carbon foot work together to pull and expand the pump mechanism membrane between the prosthetic foot’s carbon struts. When the membrane expands for any reason, the air is pulled from your prosthetic socket. Check valves near the center of the foot ensure that no air returns to the socket while walking.

Who can benefit from it?

Although all types of lower-limb amputees can use the Unity, prosthetic users who experience excessive sweating, volume stability issues, and long residual limbs can largely benefit from this vacuum system.

Experiencing improved suspension and fit can make it easier to feel where your leg is in space, as well as improve the symmetry of your walking. 

Additional features

While the features mentioned above are enough to convince most amputees to get their own Unity, there are a few more additional features that should be highlighted.

Össur’s Unity Vacuum System features a tri-function valve that connects quickly for a secure hold and releases with a single push of a button.   

Do you currently wear an Össur Unity Vacuum System? If yes, can you offer the community any insight and your experiences? Please share your thoughts in the comments section below.  
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  • I’m about to be an above the knee. Please send me more information on this.

    Adam Gadach on

  • I am a farrier and and could use a more stable prosthetic

    george phillips on

  • I currently wear the OSSUR sleeveless elevated vacuum system and I love it , I am a Very active RBKA , I went with the sleeveless system for the ROM it allows my in my right knee. I work in a lumber yard. and I climb up and over and out fork lifts & semi trucks all day. this system is so great that my amputation NEVER crosses my mind , leg is always tight and secure . the steady PSI relies on movement in the foot so I do wear a sleeve on it when I ride my motorcycle for more then a couple of hours, wouldn’t want anything flying off at 80 MPH Hehe

    Dee on

  • Please send more information on this to me. I’m an active btk amputee. Thx

    Rose on

  • I am a quadrilateral amputee (BE, BK) and would like to know if this could be covered by my Medicare and my UHC (AARP) supplement. I currently play golf, bowl and dance among other things and could certainly use more stability to do those things even better. Even simple walking could be enhanced with more stability.


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