One-Way Locking Ferrules for Knotless Suture Tensioning

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Solution Overview

Problem

Existing surgical techniques face challenges in effectively treating tissue defects in joints due to repetitive trauma, leading to joint instability and discomfort, particularly in areas like the knee, ankle, hip, or shoulder, without causing further deterioration.

Innovation Solution

A suture locking system utilizing a one-way locking mechanism, such as a locking ferrule with internal barbs, allows sutures to be tensioned in one direction while preventing movement in the opposite direction, facilitating tensionable knotless surgical repairs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional knots are used to secure sutures, then the suture can be locked in place, but the surgical procedure becomes more complex and time-consuming

Engineering Contradiction:

Improvesuture locking reliabilityVSAvoidsurgical procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical knot-tying system with a one-way locking mechanism consisting of a locking ferrule with internal barbs and a suture with a tail. The locking ferrule is inserted into the suture tail, and the barbs engage with the suture to prevent sliding, eliminating the need for complex knot-tying procedures while achieving reliable suture fixation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts the locking function from the suture itself and places it in a separate locking ferrule component. This allows the suture to be simplified while the locking mechanism is handled by a dedicated device that can be independently inserted and secured, reducing the overall complexity of the surgical procedure.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If traditional knots are used to secure sutures, then the suture can be locked in place, but the surgical procedure takes more time

Engineering Contradiction:

Improvesuture locking reliabilityVSAvoidsurgical procedure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The locking ferrule is pre-loaded with the suture tail already inserted through its cannulation. During surgery, the surgeon simply needs to insert the locking ferrule into the suture tail and tension the suture, which automatically engages the one-way locking mechanism. This preliminary preparation eliminates the need for time-consuming knot-tying operations during the surgical procedure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the time-consuming mechanical knot-tying process with a simple insertion and tensioning motion. The one-way locking mechanism engages automatically when the suture is tensioned, significantly reducing the time required for suture fixation compared to traditional knot-tying techniques.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If a locking ferrule with one-way locking mechanism is used, then the suture can be tensioned efficiently, but the locking mechanism must be precisely engineered

Engineering Contradiction:

Improvesuture tensioning efficiencyVSAvoidlocking mechanism manufacturing precision

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The locking mechanism is segmented into distinct functional elements: a locking ferrule with external barbs, an internal cannulation, and a suture tail. This segmentation allows each component to be manufactured separately with standardized tolerances, and the assembly process is simplified. The barbs are formed as integral features of the locking ferrule, reducing the need for complex precision machining.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The locking mechanism utilizes geometric parameter changes rather than requiring high-precision dimensional tolerances. The barbs are designed with specific angles and lengths that create the one-way locking action through geometric interlocking. This approach allows for easier manufacturing while maintaining reliable locking performance, as the geometry provides self-aligning and self-locking characteristics.

Inventive Principle:

Principle #35Parameter changes

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 system provides secure, knotless fixation of sutures, enabling effective tissue repair and reattachment, reducing joint instability and discomfort by maintaining tension without the need for traditional knots.

Implementation Method 1

A one-way locking mechanism may be utilized when performing the tensionable knotless surgical procedures for tensioning and locking one or more strands of suture

Methodology Applied

Scientific EffectOne-way locking mechanism: Ratchet

Implementation Method 2

A locking ferrule insertable within the opening and including a one-way locking mechanism provided within a cannulation of the locking ferrule

Methodology Applied

Scientific EffectMechanical engagement: Mechanical Fastener

Data Source

PatentUS20260020850A1Suture locking systems and methods that utilize locking ferrules with one-way locking mechanisms

Publication Date: 2026.01.22 ARTHREX INC

AI summary

Systems and methods are provided for performing tensionable knotless surgical procedures. Suture locking systems that provide one or more one-way locking mechanisms may be utilized for tensioning and locking one or more strands of suture during the surgical procedures. The one-way locking mechanisms may be established by one or more locking barbs provided within the suture locking systems.