Felt Meniscus Implant With Zoned Fiber Alignment for Load Matching

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Solution Overview

Problem

Existing medical implants for meniscus replacement or repair often differ significantly from natural tissue in mechanical properties, leading to complications such as suturing fixation challenges, surface mismatches, and uneven load distribution, which can increase friction and require repeated surgeries.

Innovation Solution

A medical implant made from a felt material with varying fiber density and alignment, mimicking the mechanical properties of the natural meniscus by creating zones with differing compressive and tensile strengths, achieved through controlled felting processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a medical implant is designed with uniform mechanical properties throughout, then manufacturing is simplified, but it cannot mimic the natural meniscus which has varying mechanical properties in different zones

Engineering Contradiction:
Improvemanufacturing simplicityVSAvoidmechanical property matching
Core Design Contradiction:
Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by creating zones with different fiber densities and orientations within the implant. The first zone has a first fiber density and the second zone has a second fiber density, allowing each zone to provide mechanical properties matched to the corresponding natural meniscus region while maintaining a unified manufacturing process through controlled fiber placement

Inventive Principle:
Principle #3Local quality

2Strength

If traditional suturing fixation is used to attach the implant to healthy meniscus, then the implant can be secured, but the fixation is complex and the attachment strength depends on limited stitches

Engineering Contradiction:
Improveattachment strengthVSAvoidsuturing complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical suturing system with a biological integration system. The implant is designed with living cells that can proliferate and integrate with the healthy meniscus tissue, substituting the need for external sutures with internal biological attachment mechanisms that provide continuous strength distribution

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If the implant surface does not match the natural meniscus surface, then manufacturing is easier, but it causes surface disparities that increase contact stress and friction

Engineering Contradiction:
Improvesurface fabricationVSAvoidfriction and contact stress
Core Design Contradiction:
Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by precisely controlling the surface topology parameters of the implant to match the natural meniscus. The surface characteristics including roughness, curvature, and geometric features are adjusted to correspond to the donor meniscus, reducing contact stress and friction while maintaining manufacturing feasibility through controlled fabrication processes

Inventive Principle:
Principle #35Parameter changes

4Reliability

If screws or interlocking mechanisms are used for total meniscus replacement, then the implant can be securely fixed, but the procedure becomes more invasive and complex

Engineering Contradiction:
Improvefixation stabilityVSAvoidsurgical simplicity
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent applies self-service by designing an implant that performs its own fixation through biological integration. The living cells within the implant proliferate and attach to the healthy meniscus tissue, enabling the implant to secure itself without requiring external fixation devices such as screws or interlocking mechanisms, thereby simplifying the surgical procedure while maintaining reliable fixation

Inventive Principle:
Principle #25Self-service

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 provides a more natural mechanical match, reducing friction and improving functional integration by distributing load similarly to the natural meniscus, with a suture-less fixation that enhances stability and reduces the need for additional surgeries.

Implementation Method 1

a felting needle (210) comprising at least one barb (211) is repeatedly advanced through the sheet (10) at specified locations

Methodology Applied
Scientific EffectMechanical Force: Mechanical Force

Implementation Method 2

a felting needle (210) comprising at least one barb (211) is repeatedly advanced through the sheet (10) at specified locations to increase the density of the fibers

Methodology Applied
Scientific EffectFriction: Friction

Data Source

PatentEP4243738B1Medical implant, method for manufacturing a medical implant, medical product, alignment tool, method for customizing a medical implant, and felting instrument
Publication Date: 2026.04.01 ZURIMED TECH AG
  • EP4243738B1 patent drawingFigure 1A~2F
  • EP4243738B1 patent drawingFigure 3~4E
  • EP4243738B1 patent drawingFigure 5A~6D

AI summary

The invention relates to a medical implant (100) extending along a plane (P) perpendicular to a first axis (A1), wherein the medical implant (100) comprises a felt material (F) comprising a plurality of fibers (101), wherein a density of said fibers (101) varies along said plane (P), and/or a percentage of said fibers (101) aligned in a circumferential direction (C) in respect of said first axis (A1) differs along said plane (P), a method for manufacturing the medical implant (100) by felting and a method for customizing the medical implant (100). Furthermore, the invention relates to s medical product (300) comprising the medical implant (100) and a transparent packaging (310) comprising printed markings (320), and to a felting instrument (200) comprising a felting needle (210) comprising at least one barb (211).