Soft Fusion Intervertebral Disc Replacement
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Solution Overview
Problem
Conventional treatments for degenerated or herniated intervertebral discs, such as discectomy followed by spinal fusion, result in loss of flexibility and unnatural stress on neighboring discs, leading to their degeneration due to the use of rigid hardware and bone fusion, which lacks natural biomechanical properties.
Innovation Solution
A method involving the combination of minced intervertebral disc fragments, mesenchymal or progenitor cells, and a scaffold, along with a binding agent, to create a soft fusion tissue that remodels in vivo, mimicking cartilage biomechanics, allowing natural weight distribution and minimizing stress on adjacent discs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid hardware (plates, screws, intervertebral cages) and bone fusion are used to stabilize the spinal defect, then mechanical stability is improved, but flexibility is lost and unnatural stress is placed on neighboring discs
Solution Approach 1:
The invention changes the mechanical parameters of the fusion tissue by using a hydrogel composition with specific elastic modulus (0.1-10 MPa) that matches native disc tissue, allowing the tissue to be initially soft for flexibility but capable of strengthening over time through biological remodeling while maintaining natural motion and stress distribution
Solution Approach 2:
The invention uses a composite hydrogel material combining crosslinkable monomers, polymers, and biological components (growth factors, cells) that creates a tissue with tunable mechanical properties - soft enough to allow natural spinal motion but strong enough to provide structural support, eliminating the need for rigid metallic hardware
2Strength
If bone fusion is used to stabilize the spinal defect, then mechanical strength is improved, but the tissue becomes too stiff and transmits unnatural forces to adjacent discs
Solution Approach 1:
The hydrogel composition is designed with an elastic modulus of 0.1-10 MPa that closely matches native intervertebral disc tissue, allowing the replacement tissue to distribute stresses and forces naturally across the spinal column rather than creating stress concentrations that occur with stiffer bone or metal implants
Solution Approach 2:
The hydrogel tissue contains living cells and growth factors that enable the tissue to self-remodel and adapt its mechanical properties over time in response to applied loads, continuously optimizing stress distribution without requiring external intervention or rigid structural support
3Object-affected harmful factors
If autologous cells and disc material are used to create the soft fusion tissue, then disease transmission risk is reduced, but material availability is limited
Solution Approach 1:
The invention uses a synthetic hydrogel matrix as an intermediary carrier that can accommodate various cell sources (autologous or allogenic) and growth factors, allowing the beneficial mechanical and biological properties to be achieved while flexibly selecting cell sources based on patient-specific needs and availability
Solution Approach 2:
The hydrogel composition parameters (monomer types, crosslinking density, concentration) can be adjusted to optimize tissue properties regardless of the specific cell source used, allowing flexibility in material selection while maintaining consistent performance and safety outcomes
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 soft fusion tissue adapts over time to exhibit mechanical properties between those of bone and cartilage, providing natural shock absorption and flexibility, reducing the risk of disease transmission and infection by using autologous cells and materials, thereby preserving spinal flexibility and reducing stress on neighboring discs.
Implementation Method 1
The function of the cells is to modulate inflammation, deposit new extracellular matrix proteins, recruit endogenous cells and blood vessels by secretion and diffusion of growth factors, and remodel the consolidated tissue over time
Implementation Method 2
The function of the rigid scaffold is to provide mechanical stiffness to the consolidated mass and a binding site for cells
Implementation Method 3
The function of the cells is to modulate inflammation, deposit new extracellular matrix proteins, recruit endogenous cells and blood vessels by secretion and diffusion of growth factors
Implementation Method 4
The binding agent bonds the various elements together and improves the implant's handling properties
Data Source
AI summary
The invention comprises a combination of biological elements that will naturally remodel in vivo based on applied mechanical forces. The final composition will possess mechanical properties similar to cartilage or a disc, and significantly less stiff than bone or implants comprised of metals or plastics. The equilibrium stress conduction will minimize unnatural forces on neighboring healthy discs.