Sleeve Augment Device Solid Bulkhead Cement Block
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Solution Overview
Problem
Existing augment devices for joint endoprosthesis face challenges due to bone defects near the implantation site, where cement can enter porous metal material, compromising bone ingrowth and making future removal difficult.
Innovation Solution
The augment device features a sandwich structure with a solid wall acting as a bulkhead to prevent cement flow, combined with porous material for bony ingrowth, and optional features like embossments and bending joints for improved fixation and placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cement is used to fill gaps or provide better seating for the augment device, then the seating quality is improved, but the cement enters the porous metal material which compromises bone ingrowth capability and makes future removal difficult
Solution Approach 1:
The augment device is segmented into distinct zones: a first porous zone for bone ingrowth, a solid bulkhead zone to block cement, and a second porous zone for additional bone ingrowth. This segmentation allows cement to be contained in specific areas while preserving bone ingrowth capabilities in other areas.
Solution Approach 2:
The solid bulkhead acts as an intermediary barrier between the cement-filled channel and the porous metal material. It mediates the interaction by allowing mechanical load transfer while preventing cement penetration into the bone-ingrowth-promoting porous structure.
2Reliability
If the sleeve is made entirely of porous material to maximize bone ingrowth, then bone ingrowth capability is improved, but the structural stiffness and strength are reduced
Solution Approach 1:
Different portions of the augment device have different material properties optimized for their specific functions: the first and third portions are porous for bone ingrowth, while the second portion (bulkhead) is solid for providing structural strength and blocking cement. Each local region has the quality it needs.
Solution Approach 2:
The augment device uses a composite structure combining porous metal material and solid metal material in a sandwich configuration. This composite approach allows the device to simultaneously achieve bone ingrowth promotion (through porous regions) and structural strength (through solid bulkhead regions).
3Reliability
If the augment device is designed with high porosity to enhance bone ingrowth, then bone ingrowth capability is improved, but the device becomes more susceptible to cement penetration
Solution Approach 1:
The solid bulkhead serves as an intermediary barrier that stops cement flow before it can reach the porous metal material. It protects the porous structure from the harmful effect of cement penetration while allowing the porous structure to maintain its high porosity for bone ingrowth.
Solution Approach 2:
The device has different functional zones with different properties: the bulkhead zone is solid to block cement, while the porous zones maintain high porosity for bone ingrowth. Each local region has the quality appropriate for its specific function.
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 effectively prevents cement from entering the porous material, preserving its bone ingrowth promoting capability, while also providing greater stiffness and facilitating easier placement and removal of the augment device.
Implementation Method 1
the sleeve being formed of porous material which is configured for ingrowth of bony material
Implementation Method 2
the wall forms a bulkhead between the inner face and the outer face, the bulkhead being configured for blocking cement flow between the inner face and the outer face
Data Source
AI summary
An augment device for a joint endoprosthesis, the device comprising: a sleeve having a top and a bottom, a distance between said top and said bottom defining an entire height of said sleeve, wherein the sleeve surrounds a channel extending through the sleeve from the top to the bottom of the sleeve wherein the channel is configured to receive a stem of the joint endoprosthesis; the sleeve comprising an inner face and an outer face, the inner face defining the channel, and a distance between the inner face and the outer face defining a thickness; the sleeve further comprising a porous material configured for ingrowth of bony material.