Composite Vertebral Implant with Radiolucent Polymer
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Solution Overview
Problem
Current interbody vertebral implants either obstruct radiographic visualization of bone growth due to metallic materials or lack sufficient osteoconductive properties for effective fusion between adjacent vertebrae.
Innovation Solution
Composite interbody vertebral implants are designed with alternating layers of porous metal and radiolucent polymeric materials, where the polymeric material is infused into the pores of the porous metal to create an osteoconductive scaffold for bone ingrowth and facilitate fusion, while allowing post-operative visualization of bone growth through radiographic means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic materials are used for interbody vertebral implants, then structural support strength is improved, but radiographic visualization of bone growth is obstructed
Solution Approach 1:
The implant combines metallic layers (providing structural support and osteoconductivity) with polymeric layers (providing radiolucency for imaging). This composite structure allows simultaneous achievement of mechanical strength and radiographic visualization capability.
Solution Approach 2:
Different regions of the implant have different material properties: metallic regions provide structural support where needed, while polymeric regions provide radiolucency for imaging. The alternating layer structure creates local quality variations that address both requirements simultaneously.
2Difficulty of detecting and measuring
If radiolucent polymeric materials are used for interbody vertebral implants, then radiographic visualization of bone growth is enabled, but osteoconductive properties for effective fusion are insufficient
Solution Approach 1:
The implant combines metallic layers (providing osteoconductivity) with polymeric layers (providing radiolucency). The metallic porous layers maintain osteoconductive properties while the polymeric layers enable imaging, creating a composite that satisfies both requirements.
Solution Approach 2:
The metallic layers are designed with porous structures that provide osteoconductive pathways for bone ingrowth. The porosity allows bone cells to migrate and grow through the implant, ensuring reliable fusion while the alternating polymeric layers maintain radiolucency.
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 composite implants provide an effective osteoconductive scaffold for bone ingrowth and fusion while enabling clear radiographic visualization of bone growth post-operatively, addressing the limitations of existing implants by combining the structural support of metal with the radiolucency of polymers.
Implementation Method 1
a first body of porous metal, a second body of porous metal, and a polymeric body of a thermoplastic polymeric material positioned between the first body of porous metal and the second body of porous metal. The first body of porous metal defines a plurality of pores formed by a metallic scaffold configured to allow bone in-growth
Implementation Method 2
The first body of porous metal defines a plurality of pores formed by a metallic scaffold configured to allow bone in-growth from a first vertebra
Implementation Method 3
interbody implants made of a radiolucent material, such as polyetheretherketone (PEEK), may allow post-operative visualization of bone growth or fusion through the implant with an imaging device, such as on an X-ray
Data Source
AI summary
A composite interbody vertebral implant for facilitating fusion of adjacent vertebrae. The implant includes a first endplate of a porous metal material and a second endplate of a porous metal material which are configured to allow bone in-growth. The implant also includes a polymeric body positioned between and bonded to the first and second endplates such that polymeric material of the polymeric body is impregnated into pores of the first and second endplates to bond the components together. The implant may include a cavity extending through the composite implant configured to receive bone growth material to facilitate fusion between a first vertebra and a second vertebra.