CPT Prosthetic Fabrication & Assembly Techniques

Question 1

What is the purpose of vacuum forming in prosthetic socket fabrication?

Accepted Answer

To shape the socket over a positive model

Answer

Vacuum forming is a manufacturing process where a heated sheet of plastic material is stretched over a positive mold (the positive model of the residual limb) and then a vacuum is applied. This process pulls the softened plastic tightly against the mold, precisely shaping it to create a custom-fitting prosthetic socket.

Question 2

Which material is commonly used for lamination in prosthetics?

Accepted Answer

Carbon fiber

Answer

Carbon fiber is widely used in prosthetic lamination due to its exceptional strength-to-weight ratio and stiffness. When combined with resins, it creates lightweight yet incredibly durable prosthetic components, such as sockets and frames, that can withstand significant forces and provide long-lasting support.

Question 3

What tool is typically used to align lower limb prosthetic components?

Accepted Answer

Alignment jig

Answer

An alignment jig is a specialized tool used by prosthetists and technicians to precisely position and secure prosthetic components (like the socket, knee unit, and foot) relative to each other. This ensures that the prosthesis is correctly aligned biomechanically, which is crucial for optimal gait, comfort, and function for the user.

Question 4

Why is the positive model critical in prosthetic socket design?

Accepted Answer

It guides socket shape and fit

Answer

The positive model is a replica of the patient's residual limb, created from a cast. It serves as the foundational mold over which the prosthetic socket is fabricated, ensuring that the final socket precisely matches the contours of the limb for an intimate, comfortable, and functional fit.

Question 5

What is the benefit of using a modular prosthetic system?

Accepted Answer

They allow easy adjustments and repairs

Answer

Modular prosthetic systems are designed with interchangeable components that can be easily assembled, disassembled, and replaced. This modularity allows prosthetists to make fine-tuned adjustments to alignment, height, and component selection, and facilitates efficient repairs or upgrades without needing to replace the entire prosthesis.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Prosthetic Fabrication & Assembly Techniques