Custom Rubber Knee Replacement With Composite Flexibility and Strength
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Solution Overview
Problem
Conventional prosthetic knee joints made of metal are inflexible, prone to degradation, and may cause discomfort and additional health issues, necessitating frequent replacements.
Innovation Solution
A prosthetic knee replacement joint constructed primarily of rubber material, customizable through medical scans, ensuring flexibility, comfort, and durability, with optional reinforcement using hemp-fiber biopolymers for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If prosthetic knee joints are constructed of metal, then strength and durability are improved, but flexibility and comfort deteriorate
Solution Approach 1:
The patent applies composite materials by combining rubber with hemp-fiber biopolymers to create a prosthetic knee joint that achieves both flexibility and strength. The rubber base material provides flexibility and comfort, while the hemp-fiber reinforcement adds structural strength and durability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent changes the material parameter from traditional metal to rubber-based composite materials. This fundamental material substitution transforms the mechanical properties of the prosthetic, providing the desired flexibility and comfort while maintaining adequate strength through the composite structure and optional reinforcement.
2Stability of the object's composition
If prosthetic knee joints are constructed of metal, then structural integrity is improved, but resistance to degradation deteriorates
Solution Approach 1:
The rubber-hemp fiber composite structure provides both structural integrity and resistance to degradation. The natural rubber and hemp-fiber biopolymers are inherently resistant to rust and corrosion that affect metal, while the composite structure maintains the necessary structural integrity through the reinforcement fibers.
Solution Approach 2:
The patent employs biodegradable hemp-fiber biopolymers as reinforcement, which can be replaced more easily than metal components. This approach accepts that the prosthetic may have a shorter service life but eliminates the problems of metal degradation, rust, and the complexity of metal component replacement.
3Ease of operation
If rubber material is used for prosthetic knee joints, then flexibility and comfort are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by selectively reinforcing specific areas of the rubber prosthetic with hemp-fiber biopolymers. Rather than uniformly complex manufacturing throughout, the reinforcement is applied locally where structural strength is needed, while other areas maintain the simple flexible rubber construction.
4Adaptability or versatility
If custom-molded or 3D printed prosthetics are produced, then adaptability to patient anatomy is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the manufacturing approach from traditional metal fabrication to rubber molding and 3D printing. These methods are inherently more suitable for customization and can produce patient-specific anatomical shapes more cost-effectively than custom metal fabrication, while the rubber material itself is less expensive than medical-grade metals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rubber-based joint provides improved flexibility, reduces friction, and is cost-effective, minimizing the need for frequent replacements while being tailored to individual patient anatomy.
Implementation Method 1
Natural rubber compounds are exceptionally flexible
Implementation Method 2
optional reinforcement using hemp-fiber biopolymers for enhanced strength
Data Source
AI summary
A prosthetic knee replacement apparatus constructed of rubber avoids the disadvantages of metal prosthetics. The knee replacement apparatus includes a base member as a spacer between the upper and lower legs of a patient. A femoral portion extends upwardly from an upper surface of the base member and a tibial portion is coupled to a lower surface of the base member. The knee replacement apparatus may be constructed completely or substantially from a rubber material so as to reduce friction and degeneration. The knee replacement system may be constructed or even 3D printed after the leg bones of the patient are scanned.