Adjustable Hip Trial Head Offset in Limited Surgical Space
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 complex, time-consuming, and disruptive manipulation of trial devices, which complicates the limited space and tissue disruption during the procedure.
Innovation Solution
The development of hip arthroplasty trial devices and systems featuring a head member with a spacer, rotatable member, drive gear, and locking mechanism that allow for offset positioning and adjustment within the limited space, enabling precise determination of the femoral head offset without repeated assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple trial devices of different head lengths are used to determine offset, then the desired offset can be determined, but the procedure becomes complex and time-consuming with repeated assembly and disassembly
Solution Approach 1:
The trial device is segmented into a head member and a separate spacer component. The spacer can be independently adjusted and locked to different positions relative to the head member, allowing offset adjustment without replacing the entire trial device. This segmentation enables precise offset determination while reducing procedural time.
Solution Approach 2:
The trial device incorporates a dynamic adjustment mechanism with a rotatable member that rotates the spacer to different angular positions. The offset is dynamically adjustable during the procedure through rotation and locking, eliminating the need for multiple static trial devices and repeated assembly/disassembly operations.
2Measurement precision
If multiple trial devices are manipulated in limited surgical space, then offset can be tested, but tissue disruption increases and surgical complexity increases
Solution Approach 1:
The trial device is designed as a universal assembly where a single head member can accommodate multiple spacers with different offset values. This multi-functional design allows all offset trials to be performed with one device platform, reducing the number of separate trial devices needed and minimizing tissue disruption from manipulating multiple devices in limited space.
3Loss of time
If adjustable trial devices are used to reduce trials, then the number of assemblies is reduced, but the device complexity increases
Solution Approach 1:
The spacer is nested within the head member, with the spacer fitting into a cavity or opening in the head member. The rotatable member and locking mechanism are integrated within this nested structure. This nesting approach consolidates multiple adjustment functions into a compact integrated assembly, reducing overall device complexity while maintaining adjustability and procedural efficiency.
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 determination of the desired offset between the femoral head and stem, reducing procedural complexity and tissue disruption while allowing for single-use disposable components, thus improving surgical efficiency and reducing the need for sterilization.
Implementation Method 1
a rotatable member defining a gear and a cam adapted to translate the spacer upon rotation of the rotatable member
Implementation Method 2
a rotatable member defining a gear and a cam adapted to translate the spacer upon rotation of the rotatable member
Implementation Method 3
a drive gear having teeth that mesh with teeth of the gear defined by the rotatable member
Data Source
AI summary
Improved hip arthroplasty trial devices and hip arthroplasty trial systems are described. A hip arthroplasty trial device has a head member having a central axis and defining an inner chamber, a head member opening providing access to the inner chamber, and a cavity extending inward from the outer surface of the head member. A rotatable member is disposed in the inner chamber and along an axis between the central axis and one side of the head member. The cavity extends along an axis between the central axis and another, opposite side of the head member. A spacer is disposed within the head member opening and is moveable between a spacer first position and a spacer second position. Rotational movement of the rotatable member moves the spacer from the spacer first position to the spacer second position.