Passive Prostheses: Simple Support Without Power
Passive prostheses are artificial limbs that don't have any powered components like motors or batteries. They rely on simple mechanics and the user's body movement to provide support and function.
Here's a breakdown:
Key Features:
* No active control: Movements are driven solely by the user's body and gravity.
* Simple design: Often made with lightweight materials like plastic or carbon fiber.
* Limited functionality: Generally provide basic support and stability, not complex movements.
* Lower cost: Typically less expensive than powered prostheses.
Types of Passive Prostheses:
* Below-elbow hand: Primarily used for gripping objects, with various grip styles available.
* Above-elbow hand: Provides support and stability for the forearm and hand, with limited grip functionality.
* Below-knee leg: Offers stability and allows for walking, usually requiring a cane or crutches for balance.
* Above-knee leg: Provides stability and support for the thigh and leg, often with a locking knee joint for standing.
Advantages:
* Lightweight and easy to use: No complex controls to learn or operate.
* Durable and reliable: Fewer components to break down or require maintenance.
* More affordable: Typically cost less than powered prostheses.
Disadvantages:
* Limited functionality: Can't perform intricate movements or grasp delicate objects.
* Requires more effort: The user needs to actively move their body to activate the prosthesis.
* Not suitable for all activities: May not be suitable for high-impact activities or tasks requiring fine motor control.
Uses:
* Daily activities: Supporting and stabilizing the limb for walking, standing, and reaching.
* Cosmetics: Providing a more natural appearance.
* Individuals with limited budgets: Offering a cost-effective solution for basic limb support.
In summary:
Passive prostheses are simple, affordable, and reliable options for individuals seeking basic limb support. They are not as functional as powered prostheses but offer a valuable alternative for certain activities and budgets.