Orientable Acetabulum Cup With Elastic Retention Ring
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Solution Overview
Problem
Current acetabular prostheses require dislocation of the hip joint to adjust the orientation of the acetabulum, which is invasive, time-consuming, and poses risks to the patient due to the need for multiple manipulations and potential dislocation-related injuries.
Innovation Solution
An orientable acetabulum with an elastic ring having a transverse slot and asperities that can be deformed to change its angular orientation without dislocating the joint, allowing for adjustment via a tightening ancillary device accessible without dislocating the coxo-femoral joint, enabling the cup to rotate freely within the acetabulum for optimal positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the acetabulum is made adjustable to modify orientation, then the adaptability is improved, but the device complexity increases due to multiple components and complex instruments required
Solution Approach 1:
The acetabulum is divided into two functional parts: a fixed base portion anchored to the acetabular cavity and a movable cup portion that can rotate independently. This segmentation allows the cup to be adjusted to different orientations while the base remains stable, providing adaptability without requiring complex multi-component systems.
Solution Approach 2:
The cup is designed with dynamic adjustment capability, allowing it to rotate freely on the base during surgery to achieve optimal orientation. After positioning, the cup can be locked in place. This dynamic design enables orientation modification without dislocating the hip joint, simplifying the overall device structure compared to previous rigid systems.
2Adaptability or versatility
If the acetabulum allows orientation modification, then the adaptability is improved, but the operation time increases due to multiple manipulations and dislocations
Solution Approach 1:
The cup's ability to rotate dynamically on the fixed base eliminates the need to dislocate the hip joint for orientation adjustments. The surgeon can modify the cup's angular position while the joint remains reduced, significantly reducing the time required for multiple manipulations and dislocations.
Solution Approach 2:
The cup incorporates self-adjustment mechanisms that allow the surgeon to modify its orientation directly without requiring complex external instruments or repeated dislocations. The rotation and locking features are designed for straightforward manual operation, reducing procedural time.
3Reliability
If the acetabulum is made adjustable without dislocation, then the patient safety is improved, but the ease of operation decreases due to limited access for adjustment
Solution Approach 1:
The cup is designed with pre-positioned rotation axes and locking mechanisms that are accessible from the anterior approach. The rotation feature is built into the cup-base assembly, allowing the surgeon to adjust the orientation without needing to access the joint from multiple directions or perform complex manipulations.
Solution Approach 2:
The adjustment mechanism is designed to be self-contained within the cup structure, with rotation and locking features that can be operated directly by the surgeon during the procedure. This eliminates the need for complex external instrumentation and maintains ease of operation while improving patient safety.
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
Enables the surgeon to adjust the acetabulum's orientation without dislocating the patient's hip, reducing the complexity and duration of the surgical procedure while minimizing risks, and allows for precise fitting of the prosthesis, potentially reducing the need for multiple dislocations and associated complications.
Implementation Method 1
un anneau élastique comportant une fente transversale... le permettant de se déformer sous l'action d'un resserrement
Implementation Method 2
ses rebords extérieurs présentant des aspérités aptes à pénétrer la paroi de la cavité acétabulaire
Data Source
Figure 1
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Figure 4
AI summary
An orientable acetabulum for a hip prosthesis, comprising a cup generally hemispherical in shape, and a device for holding the angular orientation of said cup in the acetabular cavity, characterised in that said holding device comprises an elastic ring (3) having a transverse slot (8) delimited by two edges (9, 10) of the ring (3), the ring (3) being generally circular in shape, and the outer periphery of same comprising asperities (6) that can become embedded in the surface of the acetabular cavity when the elastic ring (3) is in the relaxed state, said elastic ring (3) comprising means for gripping, by means of a tightening ancillary, making it possible to deform the elastic ring (3), by tightening that tends to bring together the edges (9, 10) of the ring (3) delimiting the slot (8), the shapes and dimensions of the different parts of the ring (3) being designed such that, in the tightened state of the ring (3), the asperities (6) do not project beyond the outer surface of the cup, thus making it possible to modify the angular orientation of the cup, and allowing said modification to be carried out without needing to dislocate the hip joint of the patient. A hip prosthesis comprising said acetabulum.