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Hands Free Hydro Cast – Optimising Trans-femoral Socket Design and Maximising Rehabilitation Potential. Buis AWP, McGarry A, Kamyab M , Murray KD, Hillman S Biomedical Engineering, University of Strathclyde, Glasgow, UK. Introduction. Statement of problem (Why)

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slide1

Hands Free Hydro Cast – Optimising Trans-femoral Socket Design and Maximising Rehabilitation Potential

Buis AWP, McGarry A, Kamyab M, Murray KD, Hillman S

Biomedical Engineering, University of Strathclyde, Glasgow, UK

introduction
Introduction
  • Statement of problem (Why)
  • Implementation of a “good” fit
  • Methodology (What & How)
  • Results
  • conclusion
statement of problem
Statement of problem
  • The purpose of a socket is to provide a mechanical connection between the skeleton and the rigid structure of the prosthesis.
  • The dominating concepts are the Quad and Ischial cont.
    • How stabilising are those sockets?
    • Are they reproducible?
    • Can we do better?
implementation of a good fit
Implementation of a “good” fit
  • Socket fit criteria:
        • As “stiff” as possible coupling
        • No tissue damage
        • Minimum discomfort

Implementation tools;

        • Surface matching
        • Volume matching
  • Is it possible to distribute the load to the different transmission elements in a controlled way?
  • Yes, if the force flow distributes itself proportionally to the stiffness of the available path!
slide5

Implementation of a “good” fit

Rubber Block

MetalBlock

Rubber Block

“Let nature deform the soft tissues in such a way that the stiffest path principle is achieved”

slide6

Methodology

  • Copy of the existing Ischial containment socket.
  • Pressure cast socket according the Hydro cast principle.
methodology work packages
Methodology (work packages)
  • Dynamic interface pressure (ideally shear)
  • Femoral stability
  • User performance outcome measures
    • Kinetic (forces)
    • Kinematic (position in space and time)
methodology
Methodology
  • Dynamic interface pressure
  • Validated Tekscan™ pressure
  • measurement system
methodology1
Methodology
  • Femoral stability
methodology2

User performance outcome measures

    • Kinetic (forces)
    • Kinematic (position in space and time)
Methodology
slide11

Results

  • Dynamic interface pressure

A M P L

Ischial

containment

Hydro

slide12

Sensor

Results

Ultrasound

Anterior

Video

X section socket

Medial

slide13

Results

Lateral

Lateral

A

A

P

P

Medial

Medial

Ischial Containment

Hydro Cast

slide14

Results

  • User performance outcome measures
  • Summary
  • Speed slightly higher with the old socket, but it was noted that the subject’s speed increased as she became more accustomed to the new socket.
  • Stride length slightly longer with the old socket, effected via increased step length bilaterally.
  • Cadence and double support time much the same for both conditions.
  • Single support time on the right a little decreased with the new socket.
  • Clear differences between pistoning and gapping were observed. Indicating that the Hydro concept is more stable.
conclusion
Conclusion
  • No significant pressure distribution differences.
  • Shear should be investigated!
  • No significant Kinetic and kinematic differences.
  • Significant stability differences in direction, pistoning and gapping in favour of the Hydro concept prosthesis.