Modular Hip Implant with Adjustable Cup Orientation

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Solution Overview

Problem

Conventional hip implants face challenges in achieving stable, cement-free attachment to the pelvic bone, particularly in cases with insufficient osseous substance, and struggle with adjusting anteversion and inclination angles accurately during implantation, leading to potential dislocation risks and mechanical instability.

Innovation Solution

A modular hip implant design featuring a base member with cooperating guides and a cup that allows for adjustable anteversion and inclination without cement, using screw connections and a mechanism for precise alignment and fixation, ensuring stable attachment and reduced risk of dislocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a simple acetabular cup is used for hip implantation, then the device complexity is reduced, but the reliability of attachment to pelvic bone deteriorates when osseous substance is insufficient

Engineering Contradiction:

Improvestructure complexityVSAvoidattachment stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The acetabular cup is divided into multiple modular components: a base member with support shell and a separate cup component that can be independently positioned and attached. This segmentation allows the base member to provide structural support while the cup component ensures reliable articulation, resolving the contradiction between simplicity and reliability in cases of insufficient bone substance.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If cement-free fastening is used to attach the cup, then the harmful factors from bone cement are eliminated, but the reliability of attachment deteriorates in cases with insufficient osseous substance

Engineering Contradiction:

Improvebone cement disadvantagesVSAvoidattachment stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The separation of the base member and cup component allows each to be optimized for its specific function. The base member can be designed with enhanced bone integration features for cement-free attachment, while the cup component focuses on providing stable articulation, thereby achieving reliable attachment without cement even in challenging bone conditions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base member and cup component can be made from different composite materials optimized for their respective functions. The base member may use materials with superior osseointegration properties for cement-free attachment, while the cup component uses materials optimized for low friction and wear resistance, achieving both harm reduction and reliability.

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If the cup position is fixed during implantation, then the ease of operation is improved, but the adaptability to individual anatomic conditions deteriorates

Engineering Contradiction:

Improveimplantation simplicityVSAvoidanatomic condition adaptation

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The modular design with separate base member and cup component creates a dynamic system where the cup can be independently positioned and oriented after the base member is attached. This dynamic adjustability allows surgeons to optimize anteversion and inclination angles to match individual patient anatomy while maintaining procedural simplicity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

By separating the attachment function (base member) from the articulation function (cup), the system allows independent optimization of each component's positioning. The base member provides stable anchoring while the cup component can be precisely angled to match patient-specific anatomical requirements, achieving both ease of operation and adaptability.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If the cup is tilted to achieve correct inclination and anteversion angles, then the adaptability to anatomic requirements is improved, but the stability of the cup in the shell deteriorates due to oscillations

Engineering Contradiction:

Improveangle adjustment capabilityVSAvoidcup position stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The modular design with a secure base member and separately attachable cup component allows the cup to be firmly fixed in its optimized position. The segmentation enables precise angular positioning without compromising stability, as each component can be independently secured to eliminate oscillations while maintaining the required inclination and anteversion angles.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9005302B2Modular hip implant

Publication Date: 2015.04.14 PETER BREHM HLDG GMBH & CO KG

AI summary

A modular hip implant is disclosed that includes a base member that is to be attached to a pelvic bone, and a cup for accommodating a hip joint prosthesis. The base member is provided with fasteners for mounting the base member on the pelvic bone as well as a concave accommodation portion for the cup. The cup has a convex outer shape which is complementary to the accommodation portion such that the radii of curvature determining the concave accommodation portion and the convex outer form essentially correspond to each other and the cup can be attached within the base member. The base member and/or the cup include adjustment means for adjusting the position of the cup relative to the base member. The invention allows the inclination and anteversion to be adjusted by arranging the cup in the base.