Modular Hip and Shoulder Prosthesis for Percutaneous Positioning

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Solution Overview

Problem

Existing hip and shoulder prosthesis positioning methods are aggressive and pose significant surgical risks, requiring minimally invasive techniques for femoral/humeral head removal and less aggressive implantation.

Innovation Solution

A prosthesis system comprising a spherical component, metaphyseal component, and diaphyseal nail, along with instruments like a cannulated extractor, Kirschner wire centering device, and insertion devices, allowing percutaneous positioning with minimal surgical aggression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard prosthesis positioning methods are used, then the prosthesis can be securely implanted, but the surgical procedure becomes very aggressive with significant risks

Engineering Contradiction:

Improveprosthesis implantation securityVSAvoidsurgical aggression and patient injury

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The prosthesis is divided into multiple modular components (spherical component, metaphyseal component, diaphyseal nail) that can be implanted separately through staged percutaneous procedures, avoiding the need for aggressive open surgery while ensuring secure implantation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The method uses preliminary percutaneous actions including inserting a Kirschner wire for centering, followed by sequential insertion of components through small incisions, allowing secure implantation without aggressive surgical exposure

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If aggressive surgical methods are used for prosthesis positioning, then the prosthesis can be properly positioned, but the incision size and soft tissue dissection increase

Engineering Contradiction:

Improveprosthesis positioning accuracyVSAvoidincision size and soft tissue disruption

Core Design Contradiction:

Manufacturing precisionVSArea of stationary object

Solution Approach 1:

The procedure transitions from traditional open surgical exposure to percutaneous access through small incisions, using instruments that pass through the skin and soft tissue to position components accurately without large incisions or extensive dissection

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

A Kirschner wire is used as an intermediary tool to establish the centering point and guide subsequent component insertion, enabling precise positioning through minimal incisions without requiring direct visual exposure of the surgical site

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP3804662B1Hip or shoulder prosthesis and positioning instrument

Publication Date: 2025.09.10 DESARROLLOS BIOMECANICOS INNOVASAN SL

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AI summary

Hip or shoulder prostheses and associated instruments which permit placement of the prosthesis in a minimally invasive way. The prosthesis includes a substantially semi-spherical component (1) supported by a metaphyseal component (2) aligned with a transverse aperture (21) for the passage of a diaphyseal nail (3), configured for insertion in the femoral or humeral canal. The metaphyseal component (2) is joined to the diaphyseal nail (3) by a locking device (24) which passes through the diaphyseal nail (3). The instrument set includes an Kirschner wire centering device (100) which permits the appropriate positioning of Kirschner wires (102, 102'), a cannulated extractor (200) for the femoral or humeral head, and respective introducers (300, 400, 500) for the prosthesis elements.