Flowable Bone Implant with Crosslinked Surface Membrane
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Solution Overview
Problem
Current bone grafting methods, such as autografts and allografts, face challenges including disease transmission, immune reactions, and interference from soft tissue cells, which can inhibit bone growth and lead to failed implants, increased morbidities, and higher costs.
Innovation Solution
A flowable biomedical implant comprising a biodegradable polysaccharide carrier matrix with ceramic particles and a crosslinkable surface membrane, which prevents soft tissue cell infiltration by forming an impermeable barrier, and optionally includes therapeutic agents like bone morphogenetic proteins to enhance bone growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the implant is made porous to allow bone growth, then osteoconduction is improved, but soft tissue cells can infiltrate and inhibit bone growth
Solution Approach 1:
The implant is segmented into two distinct zones: an inner porous region that allows bone cell infiltration and growth, and an outer impermeable membrane layer that blocks soft tissue cell infiltration. This segmentation enables the implant to simultaneously achieve osteoconduction while preventing harmful soft tissue invasion.
Solution Approach 2:
Different regions of the implant are assigned different properties: the inner core has high porosity (50-90%) to facilitate bone cell migration and vascularization, while the outer surface layer has low porosity (0-20%) to act as a barrier against soft tissue cells. This local differentiation of quality allows the implant to fulfill multiple conflicting functions.
2Object-affected harmful factors
If the implant surface is made impermeable to prevent soft tissue infiltration, then protection from harmful factors is improved, but bone cell infiltration is inhibited
Solution Approach 1:
The implant structure is divided into functional zones where the outer membrane provides impermeability to block soft tissue cells, while the inner porous matrix provides permeability for bone cell infiltration. This segmentation resolves the contradiction by applying different permeability characteristics to different regions.
Solution Approach 2:
The implant exhibits spatially varying porosity: the outer 10-50% thickness has low porosity (0-20%) for protection, while the inner 50-90% thickness has high porosity (50-90%) for bone growth. This local quality differentiation enables simultaneous achievement of barrier function and osteoconduction.
3Reliability
If bone graft material is obtained from autograft, then biocompatibility is improved, but additional surgery and infection risk increase
Solution Approach 1:
The implant serves as an intermediary bone graft substitute that eliminates the need for autograft harvesting surgery. It provides a biocompatible scaffold made from biodegradable polymers and ceramics that supports bone regeneration without requiring additional donor site surgery, thus reducing overall surgical complexity and infection risk.
Solution Approach 2:
The implant uses biodegradable materials that are resorbed by the body over time as new bone forms, eliminating the need for removal surgery. This approach replaces the need for complex autograft harvesting and potential secondary removal procedures with a single implantation of a temporary, biodegradable scaffold.
4Quantity of substance
If bone graft material is obtained from allograft, then availability is improved, but disease transmission and immune reaction risk increase
Solution Approach 1:
The implant acts as an intermediary that provides the mechanical and biological functions of bone grafting without using actual bone tissue from donors. It uses biocompatible synthetic materials that eliminate disease transmission and immune rejection risks while maintaining availability and osteoconductive properties.
Solution Approach 2:
The implant uses biodegradable synthetic materials that are resorbed by the body as new bone forms, replacing the need for allograft materials that carry disease transmission risks. This approach provides unlimited availability without the biological hazards associated with donor-derived bone grafts.
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 implant effectively inhibits soft tissue infiltration, promotes bone growth, and reduces the risk of implant failure by creating a conducive environment for new bone formation, thereby improving treatment outcomes and reducing complications.
Implementation Method 1
contacting the biodegradable polysaccharide including the ceramic particles with 0.1% by weight to about 20% by weight of a crosslinking agent
Data Source
AI summary
A flowable biomedical implant for application to a bone defect to promote bone growth is provided. The flowable biomedical implant comprises a carrier matrix including a biodegradable polysaccharide and ceramic material. An impermeable membrane can be integrally formed at the surface of the carrier matrix by applying a crosslinking agent to the biodegradable polysaccharide mixed with ceramic materials.