EchelonVT

Suitable for outdoor use
Activity Level (2) 3 (4)

EchelonVT combines the advanced hydraulic technology of Echelon with an additional rotation and vertical shock absorption element, to reduce the shear forces at the socket interface. This reduces the rate of loading at the socket interface and allows the socket to rotate with the residual limb, rather than against it. This means the user is able to move and adapt more freely, making EchelonVT ideal for taking part in activities such as golf and hiking.

Key Features

  • Hydraulic control of dorsi-flexion and plantar-flexion
  • Dorsi-flexed toe for swing phase
  • Rotation and vertical shock absorption
  • Tripod action for conformance and vertical compliance
  • Smooth hydraulic and spring action
  • Slimline foot design
  • Responsive e-carbon foot springs
  • Sandal Toe Foot Shell

Unique & Proven Echelon Technology

The Echelon range sits at the heart of our pioneering prosthetic philosophy which makes our products so popular with users around the world. Created with a sharp focus on replicating a natural and safe walking experience, each product in the Echelon Range has a characteristic to suit different users and their requirements, providing confidence in every step.

 

This not only provides excellent energy storing and release properties but also works in harmony with the range of movement in the ankle to provide a natural and comfortable walking experience. 

 

When walking up slopes, the additional range allows the body to move forward over the foot, reducing energy requirements by making rollover easier. When walking down slopes, the foot complies with the slope without forcing the leg forward, allowing for a more controlled descent.

Hydraulic damping and foot springs produce a visco-elastic response that simulates the behaviour of muscles by storing and releasing energy. When compared to non-hydraulic ankles*, this technology is clinically proven to provide comfort, safety, natural walking, balanced limb loading and overall greater patient satisfaction.

*Clinical studies, latest research papers and full references available on our website.

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

Download PDF

Download the AvalonK2 Whitepaper

Clinical Evidence

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’. 

Download PDF

*Clinical studies, latest research papers and full references available on our website.

 

EchelonVT Clinical Evidence Reference

Improvements in Clinical Outcomes using Echelon compared to ESR feet

  • Reduced risk of tripping and falls
    • Increased minimum toe clearance during swing phase1,2
  • Improving standing balance on a slope
    • 24-25% reduction in mean inter-limb centre-of-pressure root mean square (COP RMS)3
  • Reduced energy expenditure during walking
    • Mean 11.8% reduction in energy use on level ground, across all walking speeds4
    • Mean 20.2% reduction in energy use on slopes, across all gradients4
    • Mean 8.3% faster walking speed for the same amount of effort4
  • Improved gait performance
    • Faster self-selected walking speed2,5-7
    • Higher PLUS-M scores than FlexFoot and FlexWalk style feet8
  • Improved ground compliance when walking on slopes
    • Increased plantarflexion peak during level walking, fast level walking and cambered walking9
    • Increased dorsiflexion peak during level walking, fast level walking and cambered walking9
  • Less of a prosthetic “dead spot” during gait
    • Reduced aggregate negative COP displacement5
    • Centre-of-pressure passes anterior to the shank statistically significantly earlier in stance5
    • Increased minimum instantaneous COM velocity during prosthetic-limb single support phase5
    • Reduced peak negative COP velocity7
    • Reduced COP posterior travel distance7
  • Improved ground compliance when walking on slopes
    • Increased plantarflexion range during slope descent10
    • Increased dorsiflexion range during slope ascent10
  • Helps protect vulnerable residual limb tissue, reducing likelihood of damage
    • Reduced peak stresses on residual limb11
    • Reduced stress RMS on residual limb11
    • Reduced loading rates on residual limb11
  • Greater contribution of prosthetic limb to support during walking
    • Increased residual knee negative work6
  • Reduced reliance on sound limb for support during walking
    • Reduced intact limb peak hip flexion moment6
    • Reduced intact limb peak dorsiflexion moment6
    • Reduced intact ankle negative work and total work6
    • Reduced intact limb total joint work6
  • Better symmetry of loading between prosthetic and sound limbs during standing on a slope
    • Degree of asymmetry closer to zero for 5/5 amputees3
  • Reduced residual and sound joint moments during standing of a slope
    • Significant reductions in both prosthetic and sound support moments12
  • Less pressure on the sole of the contralateral foot
    • Peak plantar-pressure13
  • Improved gait symmetry
    • Reduced stance phase timing asymmetry14
  • Patient reported outcome measures indicate improvements
    • Mean improvement across all Prosthesis Evaluation Questionnaire domains15
    • Bilateral patients showed highest mean improvement in satisfaction15
  • Subjective user preference for hydraulic ankle
    • 13/13 participants preferred hydraulic ankle13

Improvements in Clinical Outcomes using shock-absorbing pylon/torque absorber compared to rigid pylon

Reduced back pain during twisting movements e.g. golf swings16

  • Reduced compensatory knee flexion at loading response17
  • No reduction in step activity18
  • Blatchford torsion adaptors match the able-bodied rotational range19
  • Reduced loading rate on prosthetic limb20, particularly at fast walking speeds21
  • Users feel less pressure on their residual limb22
  • Patient preference, citing improved comfort, smoothness of gait and easier stairs descent20

References

1. Riveras M, Ravera E, Ewins D, Shaheen AF, Catalfamo-Formento P. Minimum toe clearance and tripping probability in people with unilateral transtibial amputation walking on ramps with different prosthetic designs. Gait & Posture. 2020 Sep 1;81:41-8.
2. Johnson L, De Asha AR, Munjal R, et al. Toe clearance when walking in people with unilateral transtibial amputation: effects of passive hydraulic ankle. J Rehabil Res Dev 2014; 51: 429. Download
Overview
3. McGrath M, Laszczak P, Zahedi S, et al. Microprocessor knees with “standing support” and articulating, hydraulic ankles improve balance control and inter-limb loading during quiet standing. J Rehabil Assist Technol Eng 2018; 5: 2055668318795396. Download
Overview
4. Askew GN, McFarlane LA, Minetti AE, et al. Energy cost of ambulation in trans-tibial amputees using a dynamic-response foot with hydraulic versus rigid ‘ankle’: insights from body centre of mass dynamics. J NeuroEngineering Rehabil 2019; 16: 39. Download
Overview
5. De Asha AR, Munjal R, Kulkarni J, et al. Impact on the biomechanics of overground gait of using an ‘Echelon’hydraulic ankle–foot device in unilateral trans-tibial and trans-femoral amputees. Clin Biomech 2014; 29: 728–734. Download
Overview
6. De Asha AR, Munjal R, Kulkarni J, et al. Walking speed related joint kinetic alterations in trans-tibial amputees: impact of hydraulic’ankle’damping. J Neuroengineering Rehabil 2013; 10: 1. Download
Overview
7. De Asha AR, Johnson L, Munjal R, et al. Attenuation of centre-of-pressure trajectory fluctuations under the prosthetic foot when using an articulating hydraulic ankle attachment compared to fixed attachment. Clin Biomech 2013; 28: 218–224. Download
Overview
8. Wurdeman SR, Stevens PM, Campbell JH. Mobility analysis of AmpuTees (MAAT 5): Impact of five common prosthetic ankle-foot categories for individuals with diabetic/dysvascular amputation. J Rehabil Assist Technol Eng 2019; 6: 2055668318820784. Download
Overview
9. Bai X, Ewins D, Crocombe AD, et al. Kinematic and biomimetic assessment of a hydraulic ankle/foot in level ground and camber walking. PLOS ONE 2017; 12: e0180836. Download
Overview
10. Bai X, Ewins D, Crocombe AD, et al. A biomechanical assessment of hydraulic ankle-foot devices with and without micro-processor control during slope ambulation in trans-femoral amputees. PLOS ONE 2018; 13: e0205093. Download
Overview
11. Portnoy S, Kristal A, Gefen A, et al. Outdoor dynamic subject-specific evaluation of internal stresses in the residual limb: hydraulic energy-stored prosthetic foot compared to conventional energy-stored prosthetic feet. Gait Posture 2012; 35: 121–125. Download
Overview
12. McGrath M, Davies KC, Laszczak P, et al. The influence of hydraulic ankles and microprocessor-control on the biomechanics of trans-tibial amputees during quiet standing on a 5° slope. Can Prosthet Orthot J; 2.
13. Moore R. Effect of a Prosthetic Foot with a Hydraulic Ankle Unit on the Contralateral Foot Peak Plantar Pressures in Individuals with Unilateral Amputation. JPO J Prosthet Orthot 2018; 30: 165–70. Download
Overview
14. Moore R. Effect on Stance Phase Timing Asymmetry in Individuals with Amputation Using Hydraulic Ankle Units. JPO J Prosthet Orthot 2016; 28: 44–48. Download
Overview
15. Sedki I, Moore R. Patient evaluation of the Echelon foot using the Seattle Prosthesis Evaluation Questionnaire. Prosthet Orthot Int 2013; 37: 250–254. Download
Overview
16. Rogers JP, Strike SC, Wallace ES. The effect of prosthetic torsional stiffness on the golf swing kinematics of a left and a right-sided trans-tibial amputee. Prosthet Orthot Int 2004; 28: 121–131.
17. Berge JS, Czerniecki JM, Klute GK. Efficacy of shock-absorbing versus rigid pylons for impact reduction in transtibial amputees based on laboratory, field, and outcome metrics. J Rehabil Res Dev 2005; 42: 795.
18. Klute GK, Berge JS, Orendurff MS, et al. Prosthetic intervention effects on activity of lower-extremity amputees. Arch Phys Med Rehabil 2006; 87: 717–722.
19. Flick KC, Orendurff MS, Berge JS, et al. Comparison of human turning gait with the mechanical performance of lower limb prosthetic transverse rotation adapters. Prosthet Orthot Int 2005; 29: 73–81.
20. Gard SA, Konz RJ. The effect of a shock-absorbing pylon on the gait of persons with unilateral transtibial amputation. J Rehabil Res Dev 2003; 40: 109–124.
21. Boutwell E, Stine R, Gard S. Shock absorption during transtibial amputee gait: Does longitudinal prosthetic stiffness play a role? Prosthet Orthot Int 2017; 41: 178–185.
22. Adderson JA, Parker KE, Macleod DA, et al. Effect of a shock-absorbing pylon on transmission of heel strike forces during the gait of people with unilateral trans-tibial amputations: a pilot study. Prosthet Orthot Int 2007; 31: 384–393.

See all the Clinical Evidence for every Blatchford product in our Clinical Evidence Finder Tool.

EchelonVT Technical Data

Max. User Weight:

125kg

Activity Level:

2 3 4*

Size Range:

22-30cm

Component Weight:

855g

Build Height:

168mm sizes 22-24
173mm sizes 25-26
178mm sizes 27-30

Heel Height:

10mm

*Maximum user weight 100 kg and always use one higher spring rate category than shown in Spring selection table.
†Component weight shown is for a size 26cm without foot shell.

Selection Guide

Click the image for full size version.

 

Foot Shell Width Guide

Click on the table below to help choose the correct width when ordering the new Sandal Toe Foot Shell. For sizes 25, 26, 27 and 28 you can now choose between Narrow (N) and Wide (W) fittings.

Accessories

Alignment Wedge 940093
Foot Shell Cover 539096

Ordering

Example

ECVT 25 L N 5 3 S
Product Code Size Side Width* Spring set Axial Spring

Sandal Toe

*Narrow (N) and Wide (W) available for sizes 25-28 only.
For dark tone add suffix D. 
Example: foot size 25, left, narrow, spring rating 5, axial spring 3, sandal toe