Otto Bock C-Leg 4 User manual

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C-Leg 4 3C98-3/3C88-3
Academy
Certification course complete –V 1.6

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Agenda
1. Introduction
2. Gait cycle
3. Component selection
4. Alignment and adjustment
5. Cockpit App
6. User instructions
7. Service and warranty concept
8. User training
Certification course | C-Leg 4 | Global Academy | 225.09.2019

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Introduction
Certification course | C-Leg 4 | Global Academy | 3
The development of C-Leg 4
25.09.2019
•With its evolution, the improved C-Leg offers
additional benefits for users of high MG2, MG3
and low MG4 –primarily more safety and
improved dynamics
•An enhanced stumble recovery minimizes the
risk of falling
•Furthermore, stance release and standing with a
flexed knee are now a lot easier and therefore
noticeably improve the user’s flexibility and
freedom of movement

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Introduction
Certification course | C-Leg 4 | Global Academy | 4
Goals which were set during development
25.09.2019
•Improved swing phase behavior
•Broader range of ADL’s
•Enhanced safety
•Easier use for user and CPO
•Improved outcomes for user and CPO
•Broader group of users
•Maintain and improve proven C-Leg
stability

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Introduction
Certification course | C-Leg 4 | Global Academy | 5
Technology
25.09.2019
Tube clamp
Inertial Motion Unit (acceleration
sensors and gyroscope)
Charging plug
Servo electronics
Battery / knee angle sensor
Hydraulics
Main electronics
Bluetooth
Tube stop

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Introduction
Certification course | C-Leg 4 | Global Academy | 6
Technology –New control concept for C-Leg 4
25.09.2019
Detected parameters (sampling rate: 100 Hz)
•Knee angle
+ angular velocities
•Knee extension moment
•Inertial Motion Unit (IMU)
Linear accelerations
+ velocities & distances
Orientation of shank in space
+ angular velocities
•No ankle sensor needed due to IMU

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Introduction
Certification course | C-Leg 4 | Global Academy | 7
Technical overview
25.09.2019
Notation:
3C98-3 / 3C88-3
Weight:
1.250 g / 2,8 lbs
Amputation
level:
KD / TF / HD
ROM:
130°
Mobility grade:
2 / 3 / 4
Integrated:
Bluetooth
System height:
Distal: 289 mm
Prox. 3C98-3: 5 mm
Prox. 3C88-3: 26 mm
Operation
time:
approx. 2 days of
average use
(recommended to
charge every night)
Maximum user
weight:
136 kg / 300 lbs
Water
protection:
IP67
(weatherproof but not
corrosion resistant)

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Introduction
Certification course | C-Leg 4 | Global Academy | 8
Technical overview
25.09.2019
•The knee joint is weather-proof but not resistant to
corrosion
•Should the knee joint come into contact with salt water,
chlorinated water or other solutions remove the protective
cover if necessary. Clean the knee joint, tube adapter and
protective cover
•Use fresh water and lint-free cloth and allow the
components to fully air dry
If the knee joint shows a malfunction after drying it must
be inspected by an authorized Ottobock Service Center!

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Introduction
Certification course | C-Leg 4 | Global Academy | 9
Technical overview
25.09.2019
Knee-
extender

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Introduction
Certification course | C-Leg 4 | Global Academy | 10
Technical overview
25.09.2019
Important!
With C-Leg 1/2/3
6° inclination of pyramid
Be careful with test
fittings!
•If an additional Protector or Guard are used at
least 10 mm additional safety distance are
needed!
•When using a 4R57 rotation adapter take care
that the push-button is positioned medially!

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 11
Technical overview –Comparison of build heights
25.09.2019
C-Leg 4:
Min. distal
system height
≥ 289 mm
C-Leg:
Min. distal
system height
≥ 338 mm
∆ 49 mm

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Introduction
Certification course | C-Leg 4 | Global Academy | 12
Characteristics –Improved swing phase behavior
25.09.2019
Regulation of maximum flexion
with a high accuracy!
•Adaptive swing phase flexion control
Very good support for slow and fast
walking speeds
Adapts flexion resistances to different
walking speeds
Adapts to changed parameters (e.g.
shoe weight)

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Introduction
Certification course | C-Leg 4 | Global Academy | 13
Characteristics –Improved swing phase behavior
25.09.2019
•Real-time swing phase extension control
Adapts extension resistances to
different situations and walking speeds
Adjustable basic resistance for
extension during slow walking
Minimal resistance when walking stairs
and ramps (reliable foot positioning)

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Introduction
Certification course | C-Leg 4 | Global Academy | 14
Characteristics –Broader range of ADL’s
25.09.2019
Elective:
•Intuitive Stance Function
If the joint is at rest in a
flexed position, it is
instantaneously locked
E.g. useful for standing
on ramps
•Manual Stance Function
Via motion pattern
Locked
joint in
flexion
Flexion
possible
→ no
stable
standing
Stance Function
deactivated
Stance Function
activated

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 1525.09.2019
•Sitting Function (low flexion and
extension resistance)
•Weatherproof (IP67, not
corrosion resistant)
•2 additional MyModes for specific
activities
Characteristics –Broader range of ADL’s

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Introduction
Certification course | C-Leg 4 | Global Academy | 16
Features –Easier use for user and CPO
25.09.2019
•Cockpit App 2.2 for Android and iOS
Available for Android and Apple
devices
MyMode changes
Adjustment changes
Battery level indicator
Status information
•iOS and Android compatible knee
joints are marked by a “DUAL” logo
right on the main electronics and a
small line on the front of the main
electronic housing
Cockpit

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 17
Characteristics –Easier use for user and CPO
25.09.2019
•The Protective Cover or Guard are available to
provide protection for the knee joint
•Easy adjustment (few parameters)
•Integrated Bluetooth®(by default always activated)
•Posterior position for charging receptacle
Additionally protected by a cover
•Normal tube adapter (34 mm diameter) without
electronics (with / without torsion unit)

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 18
Characteristics –Improved outcome for user and CPO
25.09.2019
•Safety
Safe backwards walking
Enhanced stumble recovery
Easier stance release
→ smaller steps, sand… (real time
control)
Adjustable safety mode

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 19
Characteristics –Improved outcomes for user and CPO
25.09.2019
•Enhanced stumble recovery
Additional safety aspect (increased trust in the
prosthesis)
Falls may be prevented easier
•Method:
Flexion resistance during swing extension is
permanently higher (→ response time = 0ms!)
This results in enhanced stability on the
prosthetic side
More time to shift body weight to contralateral
side

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 20
Characteristics –Broader group of users
25.09.2019
•MOBIS2 –4
•Bilateral users
•Maximum knee angle: 130°
•Up to 136 kg (300 lbs) of body weight
•Minimal installation height = 307 mm (using
LoRider foot)
Shorter users possible
More functional feet possible