Felt Meniscus Implant With Zoned Fiber Alignment for Load Matching
Find Innovative SolutionsGenerate Solutions
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
Engineering 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
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
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
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
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
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
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
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
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
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
Data Source
Figure 1A~2F
Figure 3~4E
Figure 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).