Activity Level (2) 3 (4)
Impact Level

By pairing Biomimetic Hydraulic Technology with an elevated vacuum system, the design of EchelonVAC works to create a secure and comfortable socket connection.

Optimal socket connection is critical to an amputee’s comfort, security and stability. By harnessing natural ankle motion, EchelonVAC quietly creates elevated vacuum, helping to maintain an optimally fitting socket throughout the day.


  • Biomimetic Hydraulic Technology with integrated elevated vacuum
  • No power required, quiet gentle operation
  • Lightweight, compact design
  • Low build height
  • E-carbon springs for efficient energy return
  • Split toe design for ground compliance on uneven terrain
  • Weatherproof – suitable for outdoor use

How does EchelonVAC work?

With every step, the wearer presses their weight into the prosthesis, initially expelling air through a one-way valve. Simultaneously the ankle plantar exes, actively drawing air out of the socket. This air is held in the vacuum chamber and expelled through a secondary one way valve as the tibia progresses and the ankle dorsi exes.

The result is greater residual limb volume control and an improved connection between the residual limb and the socket. For the user, this reduces relative movement, improving proprioception and control of the prosthesis for greater comfort and safety every day.

EchelonVAC - How it works

Innovative Design

The innovative design of EchelonVAC is lightweight and has a low build height as no external power source is required.

With no batteries or pump to worry about, EchelonVAC is quiet and easy to fit.

When used in conjunction with a Silcare Breathe liner, the vacuum is applied directly to the residual limb to further enhance the connection between the limb and the socket.

The Evidence

Active vacuum systems help to stabilise residual limb volume to improve socket stability and proprioception. Scientific studies have shown that elevated vacuum systems help to:

  • Reduce volume fluctuation
  • Reduce interface pressures
  • Improve wound healing
  • Reduce pistoning
  • Improve gait symmetry, balance and reduce risk of falls
  • Greater comfort and improved overall satisfaction

Technical Data

Max User Weight


Component Weight


Max Vacuum

17" Hg

Heel Height



Max. user weight: 125kg 
Activity level:  2*, 3, 4*
Component weight:  930g†
Max. vacuum 17″ Hg
Build height: Sizes 22-24: 121mm
Sizes 25-26: 126mm
Sizes 27-30: 131mm
Heel height:  10mm
Warranty: 36 months
Foot shell – 12 months
Glide Sock – 3 months

*Dependent on local reimbursement guidelines. May not be suitable for running or high impact activities.
†Component weight shown is for a size 26cm without footshell.

Suitable for outdoor use



EVAC 25L 3 (D)
  Size Side Spring set Optional dark tone


Selection Chart

Click the image for full size version.

Patent reg. US8308815 GB2536056 App EP2124843 App EP2124842 App US8574312 US7985265 US8740991 US8641780 JP5336386 JP5560045 WO 2007/054736 WO 2008/071975 WO 2008/103917

An annual visual inspection is recommended. Check for visual defects that may affect proper function. Maintenance must be carried out by competent personnel.

Blatchford trademarks.

Last updated: 5th December 2016

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