Modular Hip Stem Implant Two-Incision Technique

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Solution Overview

Problem

Traditional hip arthroplasty methods require large incisions that cause damage to muscle and skin tissues due to the need for accommodating full-sized instrumentation and implants, leading to significant trauma during the procedure.

Innovation Solution

A two-incision technique is employed to implant a modular hip stem implant, where the stem portion is inserted through a posterior incision and the body portion through an anterior incision, allowing for interconnection and placement into the medullary canal with reduced incision sizes, utilizing specific instrumentation such as assembly shafts, slap hammers, and locking mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a large incision is made to accommodate full-sized instrumentation and implants, then the implantation process can be completed, but significant trauma is caused to muscle and skin tissues

Engineering Contradiction:

Improveease of implantationVSAvoidtissue trauma

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The hip stem implant is divided into two separate portions: a stem portion and a body portion. The stem portion is inserted through a small posterior incision, while the body portion is inserted through a separate anterior incision. This segmentation allows the use of smaller incisions that cause less tissue trauma while still enabling complete implantation of the functional implant.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If a small incision is made to reduce tissue trauma, then less damage is caused to muscle and skin, but it is difficult to accommodate full-sized instrumentation and implants

Engineering Contradiction:

Improvetissue traumaVSAvoidease of implantation

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The implant is segmented into two portions that can be inserted through separate small incisions. This allows each incision to be small enough to minimize tissue trauma while still being large enough to accommodate the respective portion of the implant and necessary instrumentation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The body portion is designed to be inserted through the anterior incision and positioned within the medullary canal, while the stem portion is inserted through the posterior incision and connected to the body portion. The modular design allows each component to be inserted through a small incision and then assembled in vivo.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Ease of manufacture

If the incision is made large enough to pass the full girth of the femoral broach and implant, then the implant can be installed, but the muscle fibers and skin margins are damaged by excessive stretching

Engineering Contradiction:

Improveease of implantationVSAvoidtissue integrity

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The implant is divided into two portions that can be inserted through separate smaller incisions. This avoids the need for a single large incision that would require excessive stretching of tissue, thereby preserving muscle fiber and skin margin integrity while still enabling complete implantation.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS7854769B2Method and instrumentation for performing minimally invasive hip arthroplasty

Publication Date: 2010.12.21 BIOMET MFG LLC

AI summary

A method of implanting a modular hip stem implant having a stem portion and a body portion into a medullary canal of a patient's femur utilizing a two-incision technique. The stem portion is inserted through an anterior incision and the body portion is inserted through a posterior incision where they are interconnected in vivo. The modular hip stem implant is then driven into the medullary canal with force applied through either of the two incisions.