Expandable Dome Acetabular Inserter for Double Mobility Implants
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Solution Overview
Problem
Double mobility acetabular implants lack a handle for easy manipulation during implantation, making them difficult to control and position accurately, and existing surgical instruments are challenging to clean and sterilize, posing risks of disease transmission and tissue trauma.
Innovation Solution
A modular acetabular inserter with a drive train, frusto-conical nose, and expandable dome subassembly that provides precise control and easy cleaning, featuring a handle for orientation and a design that minimizes crevices and blind holes to facilitate sterilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rod is threaded through the cup opening for easy manipulation, then ease of operation is improved, but device complexity increases and sterilization becomes difficult
Solution Approach 1:
The inserter device is divided into distinct modular components: a handle assembly, a drive train, and an engaging subassembly with frustro-conical nose and expandable dome. This segmentation allows each component to be optimized independently and facilitates easy disassembly for sterilization while maintaining the functional capability to manipulate double mobility implants
2Adaptability or versatility
If the inserter design includes many crevices and recesses for functionality, then adaptability is improved, but ease of manufacture and sterilization worsen
Solution Approach 1:
The engaging subassembly with the expandable dome is designed as a separable component that can be extracted from the main body of the inserter. This extraction principle allows the complex functional components to be removed for separate sterilization processing, eliminating the problem of trapped contaminants in crevices while preserving the adaptability of the overall device
3Manufacturing precision
If the implant position is fixed before insertion, then manufacturing precision is improved, but reliability worsens due to position change risk
Solution Approach 1:
The frustro-conical nose and expandable dome are designed to preliminarily engage and secure the implant at the desired position before final insertion. The expandable dome creates a firm grip on the implant surface, preliminarily fixing its position and orientation, which prevents position changes during the subsequent insertion through the incision
4Loss of substance
If surgical instruments are reused to reduce cost, then loss of substance is reduced, but object-generated harmful factors increase due to sterilization risks
Solution Approach 1:
The inserter incorporates dynamic elements such as the expandable dome that can change volume and shape during operation. This dynamic capability allows the device to adapt to different implant sizes and shapes, enhancing versatility while the modular design enables complete disassembly for thorough sterilization, making safe reuse possible
Data Source
AI summary
An orthopaedic prosthetic inserter used for the implantation of double mobility implants is described. The inserter consists of a drive train, a C-shaped housing, and a prosthetic cup grabbing subassembly. The subassembly comprises a frustro-conical nose and an expandable dome. When activated by the drive train, the dome expands into the cup of the prosthetic to manipulate the prosthetic during implantation.