Composite Porous Spinal Interbody for Osseointegration and Strength
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Solution Overview
Problem
Current spinal interbody implants face challenges with long-term stability and osseointegration, as well as issues with bone anchors loosening and causing tissue damage due to micro motion, leading to potential implant failure and complications.
Innovation Solution
A composite interbody design is developed, featuring a metal alloy body with porous metal bonding on both surfaces, and a locking mechanism to prevent bone anchor back-out, utilizing titanium alloys and porous titanium to enhance osseointegration and stability, with a locking mechanism that includes a cylinder with an outwardly projecting tab to secure bone screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous titanium is used to enhance osseointegration, then bone integration is improved, but mechanical strength and durability are reduced
Solution Approach 1:
The patent applies composite materials by combining solid titanium alloy (providing mechanical strength) with porous titanium (providing osseointegration) in a single interbody implant structure. The solid anterior face and medial portion provide structural integrity while the porous top and bottom portions facilitate bone ingrowth, resolving the contradiction between strength and osseointegration.
2Force
If bone anchors are used to fix the interbody in place, then initial stability is improved, but long-term stability deteriorates due to loosening and back-out
Solution Approach 1:
The patent removes bone anchors from the implant design entirely. Instead of using separate bone anchors that can loosen and back-out, the interbody implant itself is designed with a solid anterior face and integrated medial portion that directly provide stable fixation to the vertebral bodies, eliminating the source of long-term instability.
Solution Approach 2:
The patent merges the fixation function with the interbody implant structure itself. The solid titanium alloy anterior face and medial portion are integrated into a single piece that provides both structural support and fixation capability, eliminating the need for separate bone anchors and improving long-term reliability.
3Strength
If solid metal alloy is used throughout the implant, then mechanical strength is maintained, but osseointegration is insufficient
Solution Approach 1:
The patent applies local quality by giving different portions of the implant different material properties. The anterior face and medial portion use solid titanium alloy for strength, while the top and bottom portions use porous titanium for osseointegration. This localized differentiation allows each region to optimize its 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
The composite interbody design improves long-term stability and osseointegration, reduces the risk of implant failure, and prevents bone anchor back-out, enhancing fusion and reducing complications related to micro motion and tissue damage.
Implementation Method 1
modifications may include a rough surface, modified surface topography, heat treatment, alkali treatment, removal of Na ions, porous material conversion, and/or HA coating. These modifications can improve its osseointegrative potential and bioactivity.
Implementation Method 2
fusion bonding may be used to fuse the porous material to the metal alloy body
Data Source
AI summary
A method of forming a composite titanium body for use in forming spinal implant interbodies includes selecting a metal alloy body, carving out a top portion and a bottom portion from the metal alloy body, and bonding a porous material to the carved-out top and bottom portions. Multiple pieces may be cut from the composite titanium body, each having a front face formed of the metal alloy, top and bottom portions formed of the porous material, and with a medial portion of the metal alloy extending from the front face to the back. Methods and devices for spinal interbodies having locking mechanisms to prevent bone screw back-out are also described.