Adjustable Trial Neck Piece With Latching for Precise Implant Fitting
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Solution Overview
Problem
Existing joint endoprosthesis systems face challenges with secure anchoring and precise fitting due to the use of separate trial instruments, which are cumbersome and risky, and reamers, which obstruct precise examination and alignment.
Innovation Solution
A trial neck piece designed for temporary attachment to a reamer shaft, featuring a plug-on connection with multiple latching stages for adjustable height, a self-locking mechanism, and a quick-release coupling, allowing secure and defined height adjustment without additional parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate trial instruments are used for precise examination and alignment, then measurement precision is improved, but device complexity and handling difficulty increase
Solution Approach 1:
The trial neck piece is integrated directly onto the reamer shaft, merging the examination function with the excavating instrument. This eliminates the need for separate trial instruments while maintaining precise examination capability through the unified design.
Solution Approach 2:
The reamer is designed to serve multiple functions: it can be used for excavating the medullary canal and simultaneously as a trial instrument for examining and aligning the joint endoprosthesis. The trial neck piece enables the reamer to perform both excavating and trial functions.
2Adaptability or versatility
If multiple trial neck pieces of different heights are provided for individual anatomy adaptation, then adaptability is improved, but device complexity and handling difficulty increase
Solution Approach 1:
The trial neck piece incorporates an adjustable height mechanism with multiple positioning possibilities, allowing dynamic adaptation to different patient anatomies. The height can be adjusted during the procedure by rotating the trial neck piece to engage different latching positions, eliminating the need for multiple fixed-height pieces.
Solution Approach 2:
The trial neck piece is designed as a modular component with segmented height adjustment capability. The adjustment mechanism includes discrete positioning stages that allow selection of appropriate height levels, providing adaptability without requiring multiple separate trial neck pieces.
3Adaptability or versatility
If intermediate pieces and screws are used for height adjustment, then adaptability is improved, but ease of operation deteriorates due to handling small parts
Solution Approach 1:
The height adjustment function is integrated into the trial neck piece itself through a rotational adjustment mechanism. The adjustment is achieved by rotating the trial neck piece to engage different latching positions, eliminating the need for separate intermediate pieces and screws.
Solution Approach 2:
The trial neck piece includes a self-locking adjustment mechanism that automatically secures the selected height position through latching stages. The mechanism is designed to be self-contained, requiring no additional fastening components or complex assembly steps.
4Power
If the reamer drive head protrudes far out of the bone, then power transmission is improved, but measurement precision deteriorates due to obstruction
Solution Approach 1:
The reamer is designed as a two-part system with a shaft portion inserted into the bone and a separate trial neck piece attached to the upper end. This segmentation allows the drive head to remain outside the bone for power transmission while the trial neck piece extends into the cavity for precise examination and alignment.
Solution Approach 2:
The trial neck piece acts as an intermediary component that transfers the drive function from the reamer shaft to the joint endoprosthesis trial assembly. It mediates between the external drive mechanism and the internal trial components, enabling both power transmission and precise measurement.
Data Source
AI summary
A trial neck piece for a joint endoprosthesis is designed for temporary arrangement on a separate shaft body (60) that is insertable into a tubular bone (9). It comprises a fastening region (12) which can be plugged temporarily onto a head part (61) of the shaft body (60) by means of a plug connection (l l), and a neck region (IO) for receiving a joint element (19) of the joint endoprosthesis. The trial neck piece (I) is designed as a separate, plug-on attachment piece which, with its fastening region (12), can be plugged with form-fit engagement onto the head part (61) and locked. A latching device (2) is provided which comprises a plurality of latching stages for different height stages of the trial neck piece (I). The invention thus makes available an easily attachable trial neck piece which can be arranged in a defined manner in different height positions in order, on the one hand, to obtain a secure and defined arrangement and, on the other hand, to permit the setting of different heights. The invention further relates to an arrangement with a trial neck piece and with an excavating tool, in particular a reamer, and to an instrument set comprising a trial neck piece and an insertion instrument.