Hip Arthroplasty Trial Head With Adjustable Femoral Offset
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hip arthroplasty procedures require multiple trials of different femoral head lengths to determine the desired offset, leading to complexity, time consumption, and tissue disruption due to frequent hip relocation.
Innovation Solution
A hip arthroplasty trial system comprising a head member, spacer, shaft, and locking member that allows for adjustable positioning and secure attachment to a femoral stem, enabling precise determination of the desired offset without repeated assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple trial heads of different lengths are used to determine desired offset, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The trial head is divided into a fixed head member and a movable spacer component. The spacer can be positioned at multiple discrete locations along the shaft to provide different offset lengths. This segmentation allows a single trial head assembly to offer multiple offset options without requiring multiple complete head replacements, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The trial head incorporates a movable spacer that can be dynamically repositioned along the shaft between different locations. This dynamic adjustment mechanism allows the offset length to be changed during the surgical trial without removing the head member from the femoral stem, enabling precise offset determination while simplifying the overall device structure compared to multiple static trial heads.
2Measurement precision
If multiple trial heads are individually trialed to determine desired offset, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The spacer is pre-positioned at multiple discrete locations along the shaft during assembly, with each position corresponding to a specific offset length. The surgeon can directly select the desired offset by moving the spacer to the appropriate pre-configured location, eliminating the need for time-consuming iterative trials with multiple separate head components.
Solution Approach 2:
The movable spacer allows rapid adjustment of offset length during the trial procedure by simply repositioning the spacer along the shaft to different predetermined locations. This dynamic repositioning capability enables the surgeon to evaluate different offset options quickly without the time loss associated with assembling and disassembling multiple complete trial head components.
3Measurement precision
If multiple trials require assembly and disassembly of different head lengths, then measurement precision is improved, but object-affected harmful factors increase
Solution Approach 1:
By segmenting the trial head into a permanent head member and a removable spacer component, the system allows offset adjustments without removing the head member from the femoral stem. This reduces the number of times the hip joint must be completely assembled and disassembled, thereby minimizing tissue disruption and harmful effects on the bone and soft tissue structures.
Solution Approach 2:
The dynamic repositioning of the spacer along the shaft allows offset length changes while maintaining the head member's attachment to the femoral stem. This dynamic adjustment eliminates the need for repeated assembly and disassembly of the entire trial head, reducing mechanical disturbance to the hip joint and surrounding tissues.
Data Source
AI summary
Hip arthroplasty trial systems and associated medical devices, methods, and kits are described that can be utilized in situ to complete a femoral head trial. An example embodiment of a hip arthroplasty trial system includes a medical device and a femoral stem. The medical device has a head member, a spacer, a shaft, and a locking member. The spacer is disposed within the head member and is moveable from a first position to a second position. The shaft is disposed within the head member and contacts the femoral stem. The shaft is moveable from a first position to a second position. Movement of the shaft from the first position to the second position moves the spacer from its first position to its second position. The locking member is disposed within the head member and releasably attaches the shaft to the head member.