Multi-Layer Bone Lattice for Irregular Recesses

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Solution Overview

Problem

Existing implants used for bone growth stabilization often face challenges due to irregularities in the bone recess, which can reduce the surface contact between the bone and the implant, limiting its mechanical fixation and effectiveness.

Innovation Solution

The development of an implant with a multi-layer bone interfacing lattice, where the layers have varying compressibility to conform to the irregularities in the bone recess. The lattice is composed of elongate curved structural members, with layers closer to the substrate having less compressibility and those further away having more compressibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a single-layer bone interfacing lattice is used, then the implant structure is simple, but the surface contact with irregular bone recesses is insufficient

Engineering Contradiction:

Improvesurface contact areaVSAvoidlattice structure complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The bone interfacing lattice is divided into multiple layers (first layer, second layer, third layer) with different compressibility characteristics. Each layer can independently deform to accommodate irregularities in the bone recess, allowing the overall structure to achieve better conformability and surface contact without requiring an overly complex single-layer design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different layers of the lattice are assigned different compressibility properties. The first layer has lower compressibility for structural stability, while the second and third layers have progressively higher compressibility to conform to bone irregularities. This local differentiation of mechanical properties enables optimized performance for both structural integrity and surface contact.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If rigid structural members are used in the lattice, then the implant provides stability, but it cannot conform to irregularities in the bone recess

Engineering Contradiction:

Improveconformability to bone irregularitiesVSAvoidstructural stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The compressibility parameter of the lattice layers is systematically varied. The first layer maintains lower compressibility for stability, while the second and third layers have increasing compressibility to enable conformability. This parameter gradient allows the lattice to adapt to bone irregularities while preserving overall structural integrity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The lattice structure functions as a composite system where different layers exhibit different mechanical compliance. This composite approach combines the stability of rigid structures with the adaptability of more compliant structures, achieving both structural integrity and conformability to irregular bone surfaces.

Inventive Principle:

Principle #40Composite materials

3Reliability

If the lattice layers have uniform compressibility, then the manufacturing process is simple, but the mechanical fixation is limited

Engineering Contradiction:

Improvemechanical fixation effectivenessVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The lattice structure is designed with dynamic compressibility characteristics where the second and third layers can deform more readily than the first layer. This dynamic response allows the lattice to adapt to the specific geometry of the bone recess during implantation, enhancing mechanical fixation through improved surface contact and interlocking with irregular bone surfaces.

Inventive Principle:

Principle #15Dynamics

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

This design enhances the surface contact between the bone and the implant, improving the mechanical fixation and effectiveness of the implant in stabilizing bone growth, even in irregular bone recesses.

Implementation Method 1

the layers have varying compressibility to conform to the irregularities in the recess within the bone

Methodology Applied

Scientific EffectCompressibility: Compression

Implementation Method 2

the first layer has a first deformability and the second layer has a second deformability, wherein the second deformability is greater than the first deformability

Methodology Applied

Scientific EffectDeformability: Deformation

Data Source

PatentUS20250161054A1Implant With Multi-Layer Bone Interfacing Lattice

Publication Date: 2025.05.22 INSTITUTE FOR MUSCULOSKELETAL SCIENCE & EDUCATION LTD

AI summary

An implant includes a body including a substrate and a bone interfacing lattice disposed on the substrate. The bone interfacing lattice includes at least two layers of elongate curved structural members. In addition, the at least two layers of elongate curved structural members include a first layer adjacent the substrate and a second layer adjacent the first layer. Also, the first layer has a first compressibility and the second layer has a second compressibility, wherein the second compressibility is greater than the first compressibility. Further, an interface between the first layer and the second layer is a transition region having a thickness within which the elongate curved structural members of the first layer are intermingled with the elongate curved structural members of the second layer such that a boundary of the first layer overlaps with a boundary of the second layer.