Composite Implants with Porous Substrates for Tissue Integration

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Solution Overview

Problem

Existing implant compositions for soft tissue augmentation or replacement often lack porosity, leading to instability, tissue resorption, and the need for large incisions due to their non-porous surfaces and rigid, bulky designs, which can result in unsatisfactory cosmetic outcomes and increased healing times.

Innovation Solution

Composite implants comprising a soft polymeric component coupled with a porous polymeric substrate that allows for cellular and tissue ingrowth, reducing tissue resorption and enabling smaller incision sizes through a foldable design, eliminating the need for sectioning and enhancing implant stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If non-porous implant compositions are used, then implant stability is improved, but tissue resorption occurs and cosmetic results are unsatisfactory

Engineering Contradiction:

Improveimplant stabilityVSAvoidtissue resorption

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The implant composition incorporates a porous structure that enables cellular and tissue ingrowth, directly resolving the contradiction by allowing tissue integration while maintaining structural stability. The porosity facilitates osteoblast migration and bone formation within the implant matrix, eliminating tissue resorption issues associated with non-porous surfaces.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The invention uses composite material systems combining porous ceramic phases (such as hydroxyapatite or beta-tricalcium phosphate) with polymeric matrices. This composite approach provides both the mechanical stability needed for load-bearing applications and the biological porosity required for tissue integration, simultaneously addressing both requirements.

Inventive Principle:

Principle #40Composite materials

2Strength

If rigid and bulky implant compositions are used, then implant strength is improved, but incision size increases and healing time extends

Engineering Contradiction:

Improveimplant strengthVSAvoidincision size and healing time

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The invention changes the mechanical parameters of the implant material by developing porous structures with controlled density and pore size distributions. This allows the implant to achieve sufficient strength through optimized structural architecture rather than increased bulk, enabling smaller incision sizes and reduced healing times while maintaining load-bearing capacity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The implant is designed with a segmented porous structure at the microscale, where the bulk material is divided into interconnected pore spaces. This segmentation reduces the effective density and bulk of the implant while maintaining overall structural integrity through the porous framework, allowing easier insertion through smaller incisions.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If implants are divided into smaller pieces, then incision size is reduced, but implant migration increases and surface inconsistencies occur

Engineering Contradiction:

Improveincision sizeVSAvoidimplant stability and surface consistency

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention employs thin-film porous coatings or shell structures that can be conformally applied to the implant surface or even to smaller implant fragments. These thin films provide a continuous, consistent surface layer that prevents migration while maintaining the benefits of smaller implant sizes for easier insertion through reduced incisions.

Inventive Principle:

Principle #30Flexible shells and thin films

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 stabilize the implant-tissue interface by facilitating tissue growth, reducing resorption, and allowing for smaller incisions, thereby improving cosmetic outcomes and reducing healing times while maintaining implant stability.

Implementation Method 1

The composite implants comprise a soft polymeric component coupled to a porous polymeric substrate... permitting cell migration and tissue growth into the implant

Methodology Applied

Scientific EffectPorosity: Porosity

Implementation Method 2

The soft polymeric component demonstrates mechanical properties consistent with soft, non-load bearing tissues of a mammalian body

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Data Source

PatentUS8206450B2Composite implants and methods of making and using the same

Publication Date: 2012.06.26 HOWMEDICA OSTEONICS CORP

AI summary

The present invention provides composite implants for the replacement or augmentation of non-load bearing or load bearing soft tissues, and methods of making and using these implant compositions. In one embodiment, a composite implant of the present invention comprises a soft polymeric component coupled to a porous polymeric substrate.