Upper Limb Prostheses

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Upper Limb Prostheses
FERRANDINI Emilie ESIL - GBM 3
Upper Limb Prostheses
Study of prosthetic hand

• Study of prosthetic hand

Mr. BRUNET - Mr. DANIELS - Mr. FRAJUT
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Synopsis

• Introduction.
• Active Prostheses.
• Study of the hand.
• Hydraulic hand prosthesis.
• Evolutions.
• Conclusion.

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Introduction

• 85 000 people with just one hand in Europe.
• Causes accident, war, disease
• First prostheses only cosmetic.
• 1960 first functional prosthetic hand.
• Two main types
• passive prostheses.
• active prostheses.

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Active Prostheses
Active Prostheses
Study of the Hand
Hydraulic Hand Prosthesis
Evolutions

• Body-powered prostheses
• Requirements
• possess at least one gross body movement
• sufficient residual limb and musculature

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Active Prostheses
Active Prostheses
Study of the Hand
Hydraulic Hand Prosthesis
Evolutions

• Electrically powered prostheses
• Use of small electrical motors.
• Myoelectric control most popular.

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Study of the Hand
Study of the Hand
Hydraulic Hand Prosthesis
Evolutions
Active Prostheses

• Hand anatomy

• Movement and rotation around 3 axes.
• Flexion and extension of each finger.
• Thumb opposition.

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Study of the Hand
Study of the Hand
Hydraulic Hand Prosthesis
Evolutions
Active Prostheses

• Hand Representation
• Degrees of freedom (DOF)
• Interphalangeal 1 DOF
• Metacarpophalangeal 2 DOF
• Thumb 2 DOF
• Wrist 6 DOF

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Hydraulic Hand Prosthesis
Hydraulic Hand Prosthesis
Evolutions
Active Prostheses
Study of the Hand

• Patients needs
• An increase of functionality.
• A reduction of weight.
• A better cosmetic appearance.
• A tactile feedback system.
• Other requirements
• Low power consumption.
• Compactness.

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General Considerations
Hydraulic Hand Prosthesis
Evolutions
Active Prostheses
Study of the Hand

• Why hydraulic system ?
• Weight requirements.
• Power
• Cosmetic
• Feedback signal

micropump
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Ultralight Prosthesis
Hydraulic Hand Prosthesis
Evolutions
Active Prostheses
Study of the Hand

• Pump and valves far away from the hand.
• Reduced stress
• Lightness impression

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Multifunctional Prosthesis
Hydraulic Hand Prosthesis
Evolutions
Active Prostheses
Study of the Hand

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Evolutions
Evolutions
Active Prostheses
Study of the Hand
Hydraulic Hand Prosthesis

• Communication with prostheses.
• Feedback system.
• Prosthesis attachment.

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Evolutions
Evolutions
Active Prostheses
Study of the Hand
Hydraulic Hand Prosthesis

• Reduction of energy consumption.

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Conclusion

• Only Cosmetic
• Difficult design ? Simplest functions
• New technologies and materials
• Importance of patients needs

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