Acetabular Prosthesis Positioning Instrument with Threaded Rod and Ball Bearing Lock
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Solution Overview
Problem
Positioning and aligning an acetabular prosthesis within a prepared acetabulum requires dexterity and precise control, as it needs to be both positionally and rotationally fixed to ensure proper seating and alignment with the natural anatomy, which can be challenging for surgeons due to the need for precise dexterous movements and force application.
Innovation Solution
An acetabular prosthesis positioning instrument with a threaded rod and handle body that includes detents and a locking mechanism, allowing for controlled rotation and positional fixation of the prosthesis, utilizing a ball bearing system to secure the prosthesis relative to the instrument, enabling precise alignment and rotation control during implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual positioning methods are used to position the acetabular prosthesis, then the surgeon has flexibility in positioning, but the precision and control of position and rotation are insufficient
Solution Approach 1:
The positioning instrument is divided into distinct functional segments: a threaded rod for axial positioning, a rotational control mechanism for angular adjustment, and a locking mechanism for fixation. This segmentation allows each component to perform its specific function independently, achieving precise control without excessive overall complexity.
Solution Approach 2:
The patent introduces a specialized positioning instrument as an intermediary tool between the surgeon and the prosthesis. This instrument mediates the positioning process by providing controlled movement and precise alignment, translating the surgeon's intent into accurate prosthesis placement without requiring direct manual manipulation.
2Adaptability or versatility
If dexterous movements are required to position the prosthesis, then flexibility in positioning is achieved, but the ease of operation decreases
Solution Approach 1:
The positioning instrument incorporates dynamic elements that allow controlled movement during positioning. The threaded rod enables incremental axial adjustment, while the rotational control mechanism provides stepwise angular adjustment. These dynamic features maintain positioning flexibility while reducing the need for complex dexterous movements by the surgeon.
3Reliability
If force application is needed to fix the prosthesis, then secure fixation is achieved, but the complexity of force control increases
Solution Approach 1:
The locking mechanism is designed to automatically secure the prosthesis in the desired position once the positioning parameters are set. The mechanism self-locks without requiring complex force application or additional surgical steps, maintaining fixation reliability while simplifying the overall operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates efficient and precise positioning and rotation control of the acetabular prosthesis, allowing for accurate alignment and secure fixation within the acetabulum, enhancing the surgical efficiency and reducing the complexity of the procedure.
Implementation Method 1
utilizing a ball bearing system to secure the prosthesis relative to the instrument
Implementation Method 2
The acetabular engagement instrument can include at least a first portion to thread into an acetabular prosthesis
Data Source
AI summary
Disclosed is a system for engaging and holding a prosthesis both axially and rotationally relative to an inserter assembly. The inserter assembly can engage an acetabular prosthesis in a selected position, such as axially, with a first portion and then or subsequently engage the acetabular prosthesis with a second portion in a rotationally fixed manner. The acetabular prosthesis can then be inserted into a prepared acetabulum according to a disclosed method with the inserter assembly. The inserter assembly can then be removed from the acetabular prosthesis to allow for reduction of a femur.