Hip Implant Distal Stem Segmentation for Bone Preservation
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Solution Overview
Problem
Current hip replacement surgeries face challenges in minimizing the enlargement of the femoral canal, which can weaken the surrounding femur walls, and in achieving optimal fixation and stability of prosthetic implants.
Innovation Solution
A hip implant system featuring an elongated distal stem with a tapered trunnion and a proximal body, including a fastener that securely connects the components, with design features such as ridges on the stem body and cable grooves on the proximal body to enhance stability and minimize canal enlargement, allowing for better fixation and reduced reaming requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the femoral canal is enlarged to accommodate the prosthetic implant, then the implant can be securely fitted, but the surrounding femur walls are weakened
Solution Approach 1:
The implant is divided into multiple segments: a distal stem portion for canal insertion, a proximal body portion for structural support, and a modular connection interface. This segmentation allows the distal stem to fit into a smaller reamed canal while the proximal body provides the necessary structural framework, reducing the need for extensive canal enlargement and preserving femur wall strength.
Solution Approach 2:
The distal stem is nested within the femoral canal, while the proximal body encompasses the distal stem through a modular connection mechanism. This nested configuration allows the implant components to be compactly arranged, minimizing the required canal diameter and reducing the extent of reaming needed, thereby preserving bone strength.
2Adaptability or versatility
If a modular connection mechanism is used to connect stem and proximal body, then assembly flexibility is improved, but device complexity increases
Solution Approach 1:
The connection mechanism is extracted as a separate, standardized interface between the distal stem and proximal body. This extracted modular interface can be independently designed and manufactured, allowing for simplified production and assembly while maintaining flexibility in configuring different implant configurations based on patient needs.
Solution Approach 2:
The modular connection interface is designed with universal characteristics that allow it to accommodate various stem and proximal body configurations. This universal interface simplifies the overall device complexity by using a standardized connection method that can serve multiple assembly scenarios, reducing the need for multiple specialized connection mechanisms.
3Stability of the object's composition
If the distal stem is elongated to improve fixation, then stability is enhanced, but the device complexity increases
Solution Approach 1:
The distal stem incorporates dynamic features such as tapered surfaces and geometric profiles that adapt to the femoral canal geometry. These dynamic geometric features enhance fixation stability through mechanical interlocking and stress distribution without requiring additional active components or complex mechanisms, maintaining structural simplicity while improving stability.
Data Source
AI summary
Hip implant systems described herein can include a distal stem, a proximal body, and a fastener. In some embodiments, the distal stem can include a cavity configured to receive the fastener when a portion of the distal stem is positioned within the proximal body. In some embodiments, the distal stem can include a threaded exterior surface configured to mate with a fastener when a portion of the distal stem is positioned within the proximal body. In some embodiments, a distal end of the distal stem can include an anterior relief configured to conform to interior surface of a femoral canal of a patient.