Acetabular Shell Porous Regions and Screw Holes
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Solution Overview
Problem
Existing acetabular revision implants lack adaptability during surgery and are not well-suited to varying patient bone structures, limiting surgical options and fixation capabilities.
Innovation Solution
A hemispherical acetabular shell with varying porosity regions for enhanced bone cement adhesion and customizable screw placement, combined with solid struts for structural integrity, allowing for both mechanical locking and cement fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid acetabular shell is used, then structural strength is maintained, but bone cement adhesion and fixation options are reduced
Solution Approach 1:
The shell incorporates regions of varying porosity (first porous region with first porosity, second porous region with second porosity) within the substantially solid structure. These localized porous regions provide enhanced bone cement adhesion and fixation options without compromising the overall structural strength of the shell, as the solid portions maintain mechanical integrity while the porous portions enable better biological fixation.
2Ease of manufacture
If fixed screw hole placements are used, then manufacturing is simplified, but adaptability to varying bone structures is reduced
Solution Approach 1:
The shell includes multiple bone screw holes positioned at different locations and orientations throughout the structure, allowing the surgeon to dynamically select and use only the holes needed for a specific patient's anatomy and surgical approach. This dynamic configuration provides adaptability to varying bone structures while maintaining manufacturing simplicity through the use of standardized hole patterns that can be selectively utilized.
3Adaptability or versatility
If a fully porous shell is used, then bone integration is enhanced, but structural integrity and durability are reduced
Solution Approach 1:
The shell employs a hybrid structure with substantially solid portions providing structural integrity and durability, combined with localized porous regions (first porous region and second porous region) that enhance bone cement adhesion and bone integration. This local quality differentiation allows the shell to achieve both structural strength and biological fixation without requiring the entire structure to be porous.
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
Improves adhesion and fixation of the acetabular liner, providing greater surgical flexibility and better outcomes by aligning porous regions with anatomical features for improved bone integration and screw placement.
Implementation Method 1
bone cement may be disposed on the more porous portions to adhere a liner to the shell. The bone cement may have better adhesion with the more porous portions of the shell and form a relatively stronger bond between the shell and the liner.
Implementation Method 2
the shell may have regions of varying porosity, such as certain portions having a first porosity, which may be formed by pores with consistent pore sizes, and other portions having a second porosity, which may be formed by pores with consistent pore sizes, or lack of porosity.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
An orthopedic implant (100, 400) includes a first surface (106), a second surface (108), and a first body portion (109) extending between the first surface (106) and the second surface (108) to define a thickness of the implant (100, 400). The first body portion (109) includes a first porous section (412a-412c) defining pores, solid bounding struts (432a-432i, 434a-434d) including a first set of bounding struts (432a-432i, 434a-434d), and a first bone screw hole (436a-436c) extending through a thickness of the implant (100, 400). Each of the struts of the first set of bounding struts (432a-432i, 434a-434d) bound the first porous section (412a-412c). The first set of bounding struts (432a-432i, 434a-434d) include a first curved strut (432a-432i) that further bounds a portion of a perimeter of the first bone screw hole (436a-436c).