Blatchford PDAC Approved Products »


Suitable for outdoor use
Activity Level 2
AvalonK2VAC combines the award winning AvalonK2 biomimetic hydraulic ankle with an integrated elevated vacuum system. This combination offers K2 users a unique product that both improves safety and long term health, and increases the feeling of socket security.

Key Features

  • The benefits of the Biomimetic Hydraulic Technology together with integrated elevated vacuum
  • Walking motion generates a natural vacuum
  • No power required, quiet gentle operation
  • Residual limb volume is more stable resulting in reduced relative movement, improved socket connection, improved ground clearance and improved proprioception
  • 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.
  • Foot Shell and Glide Sock included.


Avalon Unique Design

The Avalon range enhances walking confidence by hydraulically adjusting to inclines and self-aligning to secure the knee joint, to encourage good posture and joint position. This improves stability, helping to prevent falls and increases balanced limb loading to provide the best performance for limited community ambulators.

The main driving force behind advancing lower limb prosthetic technology in the 21st century is biomimetic design; reproducing the biomechanical performance of natural limbs. Inherent in this is recognising that different demographics of the amputee population have different biomechanical requirements, and that the engineering principles behind different devices must accommodate for this.

With over 130 years of innovation and expertise in lower limb prosthetic technology our award-winning prosthetic products are designed with the patient in mind.

Explore Features

The Benefits of AvalonK2

Hydraulic ankles help align the body interface with the ground interface, allowing for more natural movement and posture. By continuously adjusting to absorb energy, our hydraulic ankles allow for an efficient roll-over, remaining in a dorsiflexed position, increasing clearance to help reduce the risk of falls. This technology has been proven to provide a number of benefits to limited community ambulators optimising posture and comfort.

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AvalonK2VAC offers a range of motion of 6˚ plantar and 3˚ dorsiflexion with independent hydraulic adjustment. This function allows the fine tuning of the hydraulics. The improved socket connection created by the elevated vacuum compensates for the slight reduction in motion range as the better connection improves ground clearance and reduces interface pressures, this combination delivers benefits for the higher K2 level user.

AvalonK2 Purpose Designed Keel

Limited community ambulators tend to walk more slowly, with a shorter step and stride length. Providing a foot keel that is designed to accommodate natural changes in gait can provide a smoother rollover for such users. The optimised keel shape of the Avalon range considers such requirements and encourages a consistent, stable, and comfortable rollover so the user can walk more easily and move around confidently.

AvalonK2 Elevated Vacuum

AvalonK2VAC features integrated elevated vacuum, increasing stability and preserving skin health. The vacuum system creates a more secure socket connection resulting in minimized pistoning, improved symmetry of gait patterns and enhanced proprioception, all improving stability and confidence of the user.

To preserve skin health the elevated vacuum draws blood into the residual limb, providing better circulation. The elevated vacuum improves tissue oxygenation during walking and compared to other prosthetic suspension methods, decreases trans-epidermal water loss and attenuated reactive hyperaemia. A study carried out suggested that decreasing trans-epidermal water loss preserves the skin barrier function, which protects against ulcer formation.

The Silcare Breathe liner is highly recommended for use with AvalonK2VAC. Its unique design transmits moisture away from the skin to ensure a comfortable, cool and secure fit.

Scientifically Proven


Download the AvalonK2 Whitepaper

White Paper: A Study of AvalonK2

To take a more in-depth look into the Avalon range, discover our White Paper ‘A Study of AvalonK2’ where the biomechanics of the limited community ambulators gait are considered along with the latest clinical evidence for biomimetic hydraulic technology. Then uncover how the biomechanical performance of AvalonK2 can improve mobility and independence.

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Download the AvalonK2 Whitepaper

White Paper: A Study of Residual Limb Health

While prosthetic technology edges ever closer to restoring natural performance, there is also a more basic consideration – the residuum-socket interface. Even with the world’s most advanced prosthetic limb, if it is not comfortable to wear and walk with, amputees will not use it. Socket fit and comfort are inextricably linked to residual limb health, making this a critical element in achieving and maintaining a successful prosthetic prescription.

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Download the AvalonK2 Whitepaper

White Paper: A Study of Hydraulic Ankles

Over a decade after challenging conventional wisdom, new scientific evidence continues to be published on the medical advantages of hydraulic ankles. Discover our White Paper ‘A Study of Hydraulic Ankles’. 

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Clinical Compendium

Clinical Compendium

Blatchford Biomimetic Hydraulic Technology mimics the dynamic and adaptive qualities of muscle actuation to encourage more natural gait. Multiple independent scientific studies, comparing Blatchford hydraulic ankle-feet to non-hydraulic feet, have shown:

  • Greater comfort, reduced socket pressures
  • Improved safety, reduced risk of trips and falls
  • Smoother, easier and more natural gait
  • More evenly balanced inter-limb loading
  • Greater satisfaction
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This product is only available in the US and Canada.

AvalonK2VAC Technical Data

Max. User Weight:


Activity Level:


Size Range:


Component Weight:

1lb 5oz

Build Height:


Heel Height:


†Component weight shown is for a size 26cm without foot shell.


Alignment Wedge 940093


  Size Side

For dark tone add suffix D. 
Foot example: AvalonK2 size 25 left.