Stemless Reverse Shoulder Prosthesis Bone Preservation

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Solution Overview

Problem

Current reverse shoulder prostheses require a stem that fits down the intramedullary canal, limiting implant placement and necessitating significant bone removal, which can compromise bone quality and stability.

Innovation Solution

A stemless reverse shoulder prosthesis design that includes a humeral component with a stemless portion and a cup portion, allowing for greater freedom in surgical placement and reducing the amount of bone needed for implantation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a stemmed humeral component is used, then the implant provides structural support, but the placement is limited and significant bone removal is required

Engineering Contradiction:

Improveplacement flexibilityVSAvoidbone removal

Core Design Contradiction:

Adaptability or versatilityVSLoss of substance

Solution Approach 1:

The patent removes the stem component from the humeral prosthesis, extracting the problematic element that caused bone removal and placement limitations. The stemless design eliminates the need for intramedullary canal preparation and reduces bone resection requirements while maintaining implant functionality through alternative fixation methods.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The humeral component is divided into distinct functional segments: a cup portion for receiving the glenoid ball and a stemless portion for attachment to the humeral head. This segmentation allows each portion to be optimized independently, with the stemless portion designed to minimize bone removal while providing adequate structural support and fixation.

Inventive Principle:

Principle #1Segmentation

2Strength

If a stem is included in the humeral component, then structural support is provided, but the amount of bone that has to be removed increases

Engineering Contradiction:

Improvestructural supportVSAvoidbone removal

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

The stem component is completely removed from the design, eliminating the source of excessive bone removal. The structural support function is maintained through the cup portion and remaining humeral head anatomy, preserving more native bone while achieving the necessary mechanical strength for implant fixation.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If a stem portion is used, then the implant can be fixed in the intramedullary canal, but the bone quality and stability are compromised

Engineering Contradiction:

Improveimplant stabilityVSAvoidbone quality compromise

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The stem portion is extracted from the implant design, removing the harmful effect of bone quality compromise. The stemless design avoids intrusion into the intramedullary canal and surrounding bone structures, preserving bone integrity and quality while maintaining implant stability through alternative fixation mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250177153A1Stemless reverse humeral implant systems

Publication Date: 2025.06.05 ENCORE MEDICAL L P (D B A DJO SURGICAL)

AI summary

A humeral component of a prosthetic assembly that is used in repairing or reconstructing a joint between a humerus and a scapula that includes a stemless portion and a liner portion. The liner portion is attached to the stemless portion and adapted to receive a ball portion of a cooperating “reverse” type glenoid component.