Neck Trial Plate Spring Fixation for Stem Broach
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Solution Overview
Problem
Conventional neck trials for hip replacement arthroplasty procedures face challenges in secure fixation to the stem broach, leading to either unintentional detachment during temporary reduction or requiring additional instruments for removal, which complicates the surgical process.
Innovation Solution
A neck trial with a plate spring fixing portion that engages with a recessed portion of the stem broach, allowing for integral formation and secure attachment/detachment, ensuring stable fixation without excessive strength or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the neck trial is manually removably fixed to the stem broach, then the fixation can be adjusted, but the fixation strength is insufficient causing unintentional detachment
Solution Approach 1:
The fixing portion is designed with a resilient (elastic) material that allows dynamic interaction between the neck trial and stem broach. The elastic deformation enables the fixing portion to flex during attachment and removal while maintaining secure engagement during use, resolving the contradiction between strong fixation and ease of removal.
Solution Approach 2:
The fixing portion changes its physical state between engaged and disengaged positions through elastic deformation. By changing the engagement parameter (engaged/disengaged) and utilizing material elasticity, the system achieves both strong fixation when needed and easy removal when needed, without requiring excessive force or special instruments.
2Reliability
If the fixation is excessively strong, then the neck trial remains securely attached, but special instruments are required for removal increasing procedural complexity
Solution Approach 1:
The resilient fixing portion is designed to be manually operable by the surgeon's fingers. The elastic material allows the fixing portion to be compressed and released using simple manual force, enabling attachment and removal without requiring any special instruments or tools, thus reducing device complexity while maintaining reliable fixation.
3Reliability
If the neck trial requires special instruments for removal, then secure fixation is maintained, but the surgical flow is impeded
Solution Approach 1:
The fixing portion is designed for direct manual operation by the surgeon. The resilient material allows easy compression and release with finger pressure, enabling quick attachment and removal during surgery without interrupting the surgical flow or requiring additional instruments, thereby maintaining both reliability and surgical efficiency.
Solution Approach 2:
The system uses elastic deformation to change the engagement state of the fixing portion. By applying small manual forces to change the deformation parameter, the surgeon can quickly attach or remove the neck trial, maintaining surgical efficiency while ensuring secure fixation during the temporary reduction procedure.
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
The neck trial provides reliable and efficient attachment and detachment from the stem broach, simplifying the surgical process by maintaining consistent fixation strength and reducing the need for additional instruments, thus enhancing procedural efficiency.
Implementation Method 1
The fixing portion includes a plate spring (33) having a protruding portion (34) that engages with a first recessed portion (24) of the stem broach (2)
Data Source
AI summary
A shape of a neck trial is simplified more than a known one. The neck trial includes a body portion and a fixing portion protruding from a contact surface (P) of the body portion to fix the body portion to a stem broach. The fixing portion includes a plate spring including a protruding portion that engages with a first recessed portion of the stem broach. The fixing portion and the body portion are integrally formed and can be attached to and detached from the stem broach.