Acetabular Cup Positioning Guide with Curved Angle Member
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Solution Overview
Problem
Inaccurate positioning of the acetabular cup during hip replacement surgery often leads to post-operative complications, necessitating a precise assistive device for correct placement.
Innovation Solution
An implant guide system comprising an angle guide member and positioning plates with strategically placed holes and rods, allowing for accurate alignment and positioning of the acetabular cup relative to the acetabulum, utilizing computer-simulated designs to match individual patient anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual positioning methods are used for acetabular cup placement, then the surgical procedure is simpler to perform, but the positioning accuracy deteriorates leading to post-operative complications
Solution Approach 1:
The angle guide member is pre-formed with a curved surface that corresponds in shape to the patient's acetabulum surface, and with through holes positioned at predetermined angles. This preliminary preparation of the guiding structure enables accurate positioning without requiring complex real-time measurements during surgery.
Solution Approach 2:
The angle guide member acts as an intermediary device between the surgeon and the acetabular cup. It includes a curved surface that contacts the acetabulum and through holes that guide the positioning rods, thereby mediating the transfer of anatomical geometry to the implant position with high precision.
2Measurement precision
If a precise positioning system with multiple rods and guides is used, then the acetabular cup placement accuracy is improved, but the ease of operation deteriorates due to complex assembly procedures
Solution Approach 1:
The positioning system is segmented into distinct functional components: the angle guide member with predetermined geometry, multiple positioning rods for different functions, and spacing portions for maintaining distances. This segmentation allows each component to be optimized for its specific function while maintaining overall system accuracy.
Solution Approach 2:
The angle guide member is pre-configured with through holes at specific angles and positions that correspond to the desired acetabular cup orientation. This preliminary setup eliminates the need for complex intraoperative angle measurements and calculations, simplifying the surgical procedure while maintaining precision.
3Reliability
If multiple positioning rods and through holes are used for accurate alignment, then the positioning reliability is improved, but the device complexity increases
Solution Approach 1:
The angle guide member is manufactured with through holes positioned at predetermined angles that correspond to the optimal acetabular cup orientation. This preliminary configuration ensures reliable positioning by eliminating the need for complex intraoperative alignment procedures and multiple adjustment steps.
Solution Approach 2:
The angle guide member serves as a reliable intermediary that translates the complex three-dimensional geometry of the acetabulum into simplified directional guidance through its predetermined through holes. This mediation ensures consistent and reliable positioning across different patients and surgeons.
Data Source
AI summary
An implant guide system for hip replacement surgery includes an angle guide member and a first positioning plate. The angle guide member has a body and a protrusion that are substantially connected to each other. The body has a curved surface corresponding in shape to a surface of a patient's acetabulum. The protrusion has a first through hole extending to the body. An acute angle is defined between an extension line of the first through hole and a flat surface of the body. The first positioning plate has a first holding portion and a first spacing portion that are substantially connected to each other. The first spacing portion has a second through hole, a third through hole and a fourth through hole that are parallel to each other.