Openworked 3D Knit Prosthesis X-Profile Spacer Stability

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Solution Overview

Problem

Existing openworked three-dimensional knits used in surgical prostheses deform and lose transparency under compressive forces, leading to pore obstruction and reduced cell colonization capabilities.

Innovation Solution

The design features connecting yarns that cross each other at the spacer, forming an 'X-profile' to maintain structural stability and prevent deformation, while allowing pores to remain unobstructed, even under compression or tension.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If parallel connecting yarns are used to form the spacer, then the knit structure is simple to manufacture, but the knit deforms and loses transparency under compressive forces

Engineering Contradiction:

Improveease of manufactureVSAvoidstructural stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent applies asymmetry by changing the connecting yarns from a parallel arrangement to a crossed (X-shaped) arrangement. This asymmetric configuration provides structural stability under compression while maintaining manufacturing simplicity through standard knitting techniques.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent introduces a new dimensional aspect by arranging connecting yarns in a crossed pattern rather than parallel lines. This dimensional change in yarn arrangement creates geometric interlocking that resists compression-induced deformation while preserving optical transparency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If parallel connecting yarns are used to form the spacer, then the manufacturing process is straightforward, but the pores become obstructed under compression

Engineering Contradiction:

Improveease of manufactureVSAvoidpore functionality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The crossed (asymmetric) yarn arrangement prevents pore obstruction by distributing compressive forces across multiple intersection points, maintaining pore patency while keeping the manufacturing process straightforward through conventional knitting methods.

Inventive Principle:

Principle #4Asymmetry

3Stability of the object's composition

If more material is added to reinforce the knit structure, then the structural stability improves, but the foreign material implanted in the patient increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidquantity of material

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The patent changes the geometric parameter of yarn arrangement from parallel to crossed configuration. This parameter change enhances structural stability through geometric interlocking without increasing material quantity, thereby reducing foreign body burden while maintaining knit integrity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12258689B2Prosthesis comprising a three-dimensional and openworked knit

Publication Date: 2025.03.25 SOFRADIM PRODUCTION SAS

AI summary

The present invention relates to a prosthesis (100) comprising an openworked three-dimensional knit (101) comprising a front face and a rear face, each face being formed with one or more laps of yarns defining pores on said face, the front face being bound to the rear face by connecting yarns defining a spacer, characterized in that the connecting yarns are distributed so that they define an entanglement of yarns crossing each other at the spacer, without obstructing the pores of the front and rear faces.