Arthroscopic Delivery of Cell-Seeded Matrices for Cartilage Repair

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Solution Overview

Problem

Current methods for treating cartilage defects, such as matrix-induced autologous chondrocyte implantation (MACI), often require invasive open surgical techniques, leading to increased risk of infection, longer recovery times, and greater pain, while also facing challenges in maintaining cell viability during arthroscopic delivery.

Innovation Solution

The development of arthroscopic surgical methods for delivering cell-seeded matrices, using techniques like templating, shaping, and fixation with biocompatible glues, to achieve cell viability comparable to open surgical methods, with the use of cannulas and surgical tools for precise delivery and fixation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If open surgical techniques (mini-arthrotomy) are used for MACI implantation, then cell viability and treatment efficacy are maintained, but patient recovery time increases, infection risk increases, and pain increases

Engineering Contradiction:

Improvecell viabilityVSAvoidrecovery time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the traditional open surgical mechanical approach with an arthroscopic system that uses a cannula-based delivery mechanism. The cell-seeded matrix is delivered through a cannula inserted through small incisions, eliminating the need for large open incisions while maintaining cell viability through controlled delivery conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cell-seeded matrix itself acts as a flexible thin film that can be delivered through the narrow cannula. The matrix is designed to be thin enough to pass through the cannula while maintaining structural integrity and cell viability, then expands or conforms to the defect site upon delivery.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If open surgical techniques are used for MACI implantation, then cell viability is maintained, but the invasiveness and patient pain increase

Engineering Contradiction:

Improvecell viabilityVSAvoidinvasiveness and pain

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-affected harmful factors

If arthroscopic delivery is attempted, then invasiveness is reduced, but cell viability may be compromised

Engineering Contradiction:

ImproveinvasivenessVSAvoidcell viability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The cannula serves as an intermediary delivery device that protects the cell-seeded matrix during transport through the arthroscopic system. The matrix is delivered in a protected state within the cannula, then released in a controlled manner at the target site, ensuring cell viability is maintained throughout the minimally invasive delivery process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent controls physical parameters during delivery (such as temperature, pressure, and handling conditions) to maintain cell viability. The delivery system is designed to preserve appropriate physiological conditions for the cells throughout the arthroscopic delivery process.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250000672A1Methods for repairing cartilage defects

Publication Date: 2025.01.02 VERICEL CORP

AI summary

The present disclosure describes methods for repairing cartilage defects by arthroscopic surgery to deliver cultured chondrocyte implants to defect sites. The implants may include bioresorbable matrices seeded with chondrocytes that are shaped to match cartilage defect sites, and which may be delivered to the cartilage defect sites by methods described in the present embodiments.