Joint Replacement Prosthesis With Trans-Cortical Modular Stems
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Solution Overview
Problem
Existing joint replacement prosthesis systems face challenges in inserting stems into long bones without violating adjacent sensitive anatomy, often requiring invasive procedures and compromising bone healing.
Innovation Solution
A novel joint replacement prosthesis system featuring a base component with stem connectors and modular stems, where the stems are inserted from the bone-facing surface side, allowing for coaxial drilling and axial compression to form a secure friction lock connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stems are inserted from the bottom of the foot through drilling and reaming, then rigid fixation of the implant is achieved, but sensitive anatomy (tendons, nerves, blood vessels) and bone are violated
Solution Approach 1:
The patent inverts the traditional insertion approach by drilling holes from the top surface of the base component rather than from the bottom of the foot. This allows stems to be inserted through the base component into the tibia canal without making incisions or drilling through sensitive structures at the bottom of the foot, thereby achieving rigid fixation while protecting tendons, nerves, and blood vessels
Solution Approach 2:
The patent changes the insertion dimension by transitioning from a distal-to-proximal approach (through the bottom of the foot) to a proximal-to-distal approach (through the top surface of the base component). This dimensional change allows the surgical team to access the tibia canal through the base component without violating the sensitive anatomy at the calcaneus level
2Ease of operation
If the anterior tibia cortex is removed to insert the stem, then the stem can be placed in the tibia canal, but the cortex must be replaced and healing is delayed or compromised
Solution Approach 1:
The patent applies preliminary action by pre-forming holes through the base component at the desired angles and positions before stem insertion. This allows the stems to be inserted directly into prepared pathways through the base component and into the tibia canal, eliminating the need to remove and replace the anterior cortex and avoiding delays in healing
3Stability of the object's composition
If modular stems are used to provide robust stabilization, then implant stability is improved, but the complexity of assembling and implanting increases
Solution Approach 1:
The base component is designed with universal stem connectors that can accommodate multiple different modular stem designs and configurations. This allows the same base component to work with various stem options, providing robust stabilization while simplifying the overall system by using a standardized interface rather than requiring multiple specialized components
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
This solution enables robust stabilization of the implant in the bone while minimizing the violation of sensitive anatomy, promoting better healing and reducing the risk of complications.
Implementation Method 1
axially compressing the modular stem and said one of the one or more stem connectors together to form a connection between the modular stem and the stem connector
Data Source
AI summary
Provided is a novel joint replacement prosthesis that includes a base component, and one or more modular stems. The base component includes a bone-facing surface including one or more stem connectors configured for receiving and forming connections with the one or more modular stems inserted from the bone-facing surface side.