P1252428409zUonm

1
Mauch Knee
2
Mauch Knee Agenda

• Mauch Hydraulic Design
• User Profile
• Features Benefits
• Specifications
• Technical Overview
• Alignment
• Studies

3
Mauch KneeStance and Swing Hydraulic Design

• Stance
• Mauch cylinder mimics eccentric contraction of
  quadriceps
• Will stabilize knee beyond 15 for smooth,
  efficient, and secure ramp and stair descent
• Swing
• Controls Swing Flexion and Extension for a wide
  range of speeds.

4
Mauch Knee Hydraulic Design

• Designed to compliment the Flex-Foot features
• Full Length Toe and Category Selection
• Too short/soft
• Late deactivation of stance
• Too long/stiff
• Early deactivation of stance

5
Mauch Knee User Profile

• High Voluntary Control
• Can actively control knee stability under
  changing conditions
• Variable Cadence
• Ability or potential to walk at varying speeds
• Interest in Advanced Performance
• Natural and efficient method of stair and ramp
  descent
• Desire for step over step descent method on
  most terrain

6
Mauch Knee User Profile Manual Lock

• Patient requires extra stability in special
  situations
• Examples
• Descending steep or slippery terrain
• Climbing ladders
• Walking through brush or tall grass

Manual Lock
7
Mauch Knee User Profile Swing Only

• Patient requires high frequency cycling of knee
  without drag of stance control
• Examples
• Rowing
• Cycling
• Running
• Exercise Machines

Swing Only
8
Mauch Knee Alignment

• ALIGNMENT REFERENCE LINE
• Bisects the lateral wall at the ischial level of
  the socket
• Through the intersection of the posterior and
  middle third of the foot.
• Position knee so that the reference line passes
  through or slightly POSTERIOR to the knee axis
• Knee axis ANTERIOR
• Unstable - knee flexion moment
• Knee axis POSTERIOR
• Stable - difficulty initiating flexion

9
Mauch Knee Retrofittability

• Due to new pyramid repositioning 6 mm POSTERIOR
  slide of the socket is required.

6 mm
10
Mauch KneeSpecifications
Build height 8 2/3 Weight 2.5lbs with
cylinder Weight Limit 300lbs
3/17/2014
11
Mauch Knee General Design
Rear Cover (Removable) Rigid frame
material Flexible rubber material on cover. Soft
impact if socket hits knee
Front Cover (Removable) Flexible rubber
material Combines bumper function and design
Knee Shell Hard materialImpact resistant
Aluminum Frame
11
12
Mauch Knee Pyramid Position
Pyramid moved 6mm anterior Allows for slight
anterior positioning of distal socket attachment
to accommodate socket flexion.
13
Mauch Knee Extension Stop
Adjustable Extension Stop Allows the knee
extension to be customized to patient
requirements With the option of soft or firm stop.
3/17/2014
14
Mauch Knee Redesigned Axis and Bearings

• New Main Axis and Bearing Design.
• Minimizes play
• Maximizes strength
• Increases durability

3/17/2014
15
Mauch Knee Spherical Cylinder Bearings

• Sealed Spherical Bearings on Cylinder
• Isolates Cylinder from Axial and Rotational
  Forces
• Simplified Design with improved strength.
• Improved Durability with decreased wear on all
  parts

16
Mauch Knee Studies

• Clinical studies that reveal the positive effect
  of the Mauch
• 97 Mauch acceptance rate The knee gave a
  smoother gait, ability to change cadence,
  increased activity level, increased stability in
  stance, fewer falls, and less fatigue.
• Volatile TB, Roberson JR, Whitesides TE Jr. (The
  Mauch Hydraulic Knee Unit For Above-Knee
  Amputation)
• Orthopedics 1985 February 8(2) 229-30.
• Mauch minimizes knee instability by including
  stumble recovery feature and yielding stance for
  stair descent foot over foot.
• Contini R, Gage H, Yatkauskas A, Drillis RJ
  (Functional Evaluation and Acceptability Of The
  Henschke-Mauch Hydraulik Swing and Stance
  Control System) Department of Medicine and
  Surgery, Veterans Administration Contract No.
  V1005M-1917 Submitted by
• Research Division, New York University,
  School of Science and Engineering, July 1964.
• 98.2 success rate Hydraulic knee unit
  recommended for use in the active above-knee
  amputee with good strength, longer limb length,
  capability of variable cadence, and ability to
  increase activity level.
• Whitesides TE Jr, Volatile TB. (Mauch SNS
  Hydraulic Knee Units In Above-Knee Amputees. A
  Long-term Follow-up Study)
• Clin Orthop, 264-8, 1985.

17
Mauch Knee

• Thank You