Otto Bock Microprocessor Knees

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Otto Bock Microprocessor Knees
Jeff Honma C.P.O. Otto Bock Health Care
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Walking with an AK Prosthesis
What are the scary parts of the gait cycle while
walking with an AK prosthesis?
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Introduction to the C-Leg
C-Leg The Worlds First Microprocessor
Controlled Hydraulic Stance and Swing
Phase Prosthetic System
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Introduction to the C-Leg

• C-Leg History
• 1988 First Prototype developed by Kelly
  James, Canada

1997 C-Leg brought onto the market in
Canada and Europe 1999 C-Leg introduced in the
US 2006 over 13,000 sold world wide in over 20
different countries. Over 1,900 practitioners
trained in the United States. Fall 2006 New C-Leg
released
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How the C-Legworks
Concept of Real time gait analysis

The knee joint measures gait parameters 50 times
per second, analyzes the patients gait and
changes the hydraulic controls to prepare for
the patients next movement.

• Knee angle change
• Direction and velocity
• Ankle plantarflexion moment
• Increasing/ decreasing
• Ankle dorsiflexion moment
• Increasing/ decreasing

Yielding
ISPO walk speed
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C-Leg
How does it work?
Input
Processing
Output
Knee Angle
Valve Position for Hydraulic Knee Control
Ankle Bending Moments
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Stance Disengagement Rules

• Dorsiflexion moment loading gt70 of max
• Knee is fully extended

• ONLY if BOTH criteria are met!

Safe Mode default is Stance
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Stance Flexion Damping
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2nd Mode

• gt For switching over, load the toe three times
  with the leg extended but without completely
  unloading the prosthesis.
• gt Success is indicated by a signal. Then lift
  the prosthesis off the ground. The C-Leg will
  then switch Modes and confirm by a signal.

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Wireless Remote Control
Switching 1st and 2nd mode
Enabling/disabling standing mode
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Introduction to the Compact
Otto Bock Compact Microprocessor Controlled
Stance Phase Prosthetic System
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Introduction to the Compact

• The Otto Bock Compact features the security of
  Microprocessor Stance Phase Control
• Swing Phase is controlled by hydraulics for
  smooth swing phase.
• No 2nd Mode.
• No standing mode
• No remote control functions

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Introduction to the Compact

• Controlled stable decent on stairs ramps and
  uneven surfaces!

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• Who is a C-Legor
• Compact
• Candidate ?

• C-Leg K3 or K4
• Compact K3
• Weight Limit- 275 Pounds

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Battery Power

• Otto Bock Microprocessor Knees are
• powered by a lithium ion battery.
• The battery will last 40-45 hours.
• Recharging a dead battery takes
• about 4 hours.
• Most people recharge the battery
• every night.
• The battery doesnt have a memory
• so it can be charged at any time.

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C-Leg and Compact
A loaner Knee is available while the C-Leg or
Compact are in for service

• C-Leg and Compact Warranty
• World Wide Mobility Concept
• 3 Year period
• Service at 24 months
• 5 year warranty available for C-Leg with service
  at 48 months

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Questions?