Longitudinal Seam Vascular Prosthesis Arch Stabilization

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Solution Overview

Problem

Existing vascular prostheses face challenges in stabilizing the arch shape, particularly in machine-based production methods, which often require complex transverse seams or stents, and lack a simple method to maintain the accordion-like structure and tensile strength.

Innovation Solution

A vascular prosthesis with a longitudinal seam that gathers the prosthesis wall while preserving the accordion-like structure, allowing for machine-based stabilization and tensile strength, using a single or double-chain stitch with thread looping around compacted folds, and optionally thermal fixing for preforming the arch shape.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If transverse seams are used to stabilize the arch shape, then the arch shape is stabilized, but the production complexity increases and machine-based production becomes difficult

Engineering Contradiction:

Improvearch shape stabilizationVSAvoidproduction complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

Instead of using transverse seams to stabilize the arch, the invention uses longitudinal seams that run parallel to the arch direction. This inverted approach allows the seam to follow the natural curvature of the arch, simplifying the production process while maintaining stabilization effectiveness.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention changes the orientation parameter of the seam from transverse to longitudinal, and modifies the stitching pattern to create gathering effects. This parameter change enables machine-based production while achieving the same arch stabilization function.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the pleating is pressed together in the radial direction to facilitate machine seams, then machine production becomes easier, but the accordion-like structure is lost

Engineering Contradiction:

Improvemachine production easeVSAvoidaccordion-like structure

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The invention applies different treatments to different regions: the pleating is pressed together only in the specific area where the longitudinal seam is applied, while the rest of the prosthesis maintains its full accordion structure. This localized pressing enables machine seams without sacrificing the overall accordion-like structure.

Inventive Principle:

Principle #3Local quality

3Device complexity

If longitudinal seams are used to gather the prosthesis wall, then the arch shape is stabilized and production is simplified, but the tensile strength must be maintained

Engineering Contradiction:

Improveproduction simplicityVSAvoidtensile strength

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The invention creates preliminary gathering effects through the longitudinal seam stitching pattern before final assembly. This preliminary action of gathering the pleats along the longitudinal seam path prepositions the folds to mutually support each other, ensuring both arch stabilization and maintenance of tensile strength in the final product.

Inventive Principle:

Principle #10Preliminary action

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 method enables effective arch stabilization with improved tensile strength and simplified production, maintaining the compacted state of pleating without losing the accordion structure, suitable for machine production and ensuring the vascular prosthesis maintains its shape and functionality.

Implementation Method 1

an arch-shaped longitudinal flexion extending over at least a partial section and formed by asymmetric shortening gathering of the prosthesis wall by means of at least one longitudinal seam extending along the partial section

Methodology Applied

Scientific EffectGathering:

Implementation Method 2

The arch shape of the vascular prosthesis can be preformed by thermal fixing, which proves to have a favorable effect

Methodology Applied

Scientific EffectThermal fixing:

Implementation Method 3

the tightly contiguous folds of the pleating mutually support one another, so that the arrangement of a seam whose stitches pass radially through the compacted prosthesis wall are formed in a simple manner

Methodology Applied

Scientific EffectStructural interlocking:

Data Source

PatentUS8128683B2Longitudinally flexible textile vascular prosthesis

Publication Date: 2012.03.06 AESCULAP AG

AI summary

The invention relates to a textile vascular prosthesis (1) with a circulatory pleating formed by folds (4), and with an arch-shaped longitudinal flexion (2) extending over at least a partial section and formed by asymmetric shortening gathering of the prosthesis wall by means of at least one longitudinal seam (7) extending along the partial section. The at least one longitudinal seam gathers the prosthesis wall while preserving the accordion-like structure (4) and the compacted state of the pleating (4) in the longitudinal direction.