Hip Endoprosthesis Holding Element Centering and Retention
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Solution Overview
Problem
Current hip joint endoprosthesis systems face difficulties in handling and securely inserting joint inserts, particularly with ceramic materials, due to lack of feedback on correct positioning and ease of removal, leading to time-consuming follow-up inspections.
Innovation Solution
The hip joint endoprosthesis system features a holding element with an inclined retention surface, forming an inner cone surface that tapers distally, allowing for secure centering and holding of the joint insert, enabling easier insertion and removal with a single holding element, and providing feedback on correct positioning through a deformable retaining member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple individual holding elements are used to hold the joint insert, then the holding function is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple holding elements into a single integrated holding element that features a centering body and a retaining member with an inclined retention surface. This unified structure maintains the reliability of multiple holding points while eliminating the complexity of managing separate elements, as the single holding element provides both centering and retention functions simultaneously.
Solution Approach 2:
The single holding element is designed to perform multiple functions: it centers the joint insert through the centering body, holds the insert securely through the retaining member, and guides insertion into the joint socket. This multi-functional design replaces what would traditionally require multiple specialized elements, reducing complexity while maintaining or improving holding reliability.
2Reliability
If a self-locking clamp is used to couple the joint insert to the joint socket, then the coupling security is improved, but the ease of removal deteriorates
Solution Approach 1:
The holding element is designed with dynamic characteristics that allow it to transition between a locked state during insertion (providing secure coupling) and a released state for removal. The deformable retaining member can be compressed to release the joint insert, enabling easy removal while maintaining secure coupling during the insertion process.
3Device complexity
If traditional insertion instruments are used without feedback mechanisms, then the device complexity is reduced, but the measurement precision of positioning deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms through the deformable retaining member that provides tactile feedback to the surgeon during insertion. When the joint insert reaches the correct position, the retaining member deforms in a predictable manner, providing immediate feedback on positioning accuracy without requiring complex electronic or optical measurement systems.
4Ease of operation
If ceramic joint inserts are handled without specialized guidance, then the ease of operation is improved, but the manufacturing precision of insertion positioning deteriorates
Solution Approach 1:
The holding element acts as an intermediary between the surgeon and the ceramic joint insert. It provides a secure grip on the insert while guiding it into the joint socket with precise positioning. The centering body and inclined retention surface work together to ensure accurate alignment, making it easy to handle ceramic inserts without compromising positioning precision.
Data Source
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AI summary
Hip joint endoprosthesis system (10) with a medical instrument set (12) for implanting a hip joint endoprosthesis (20) comprising at least one medical instrument (14) for inserting a joint insert (16) into a joint socket (18) of the hip joint endoprosthesis (20), characterized in that the instrument (14) comprises a retaining element (84) for temporary coupling with the joint insert (16) and a centering body (126) for centering the joint insert (16) relative to the retaining element (84).