Hip Prosthesis Restricting Mechanism for Dislocation Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hip joint prosthetics face challenges such as dislocation and loosening due to abnormal strain, leading to complications like infection and prolonged recovery, as they do not fully replicate the natural motion range and stability of the hip joint.
Innovation Solution
A medical device with an artificial caput femur and acetabulum system featuring an elongated portion with a restricting mechanism that limits motion range to prevent dislocation, while allowing for an advantageous range of motion, is implanted using a surgical or minimally invasive method, ensuring secure fixation to the pelvic and femoral bones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal prosthesis is placed in Femur and a plastic bowl in Acetabulum through traditional hip joint surgery, then the hip joint can be replaced to treat osteoarthritis, but the risk of dislocation and loosening increases due to abnormal strain and macrophage reaction
Solution Approach 1:
The elongated portion with restricting portion is designed in advance to prevent dislocation before it can occur. The restricting portion creates a mechanical constraint that actively counteracts the tendency of the prosthesis to dislocate under abnormal strain, rather than merely reacting to dislocation after it happens.
Solution Approach 2:
The prosthetic joint allows dynamic movement within a controlled range. The restricting portion dynamically limits the motion range to prevent dislocation while still permitting beneficial movement, creating a balance between mobility and stability that adapts to the patient's movement patterns.
2Ease of manufacture
If the hip joint capsule is penetrated to access the hip joint during surgery, then the joint can be accessed for prosthesis implantation, but the ability to achieve full functional joint recovery is compromised
Solution Approach 1:
The prosthesis is segmented into distinct components: the spherical portion for articulation, the elongated portion for structural support, and the restricting portion for motion control. This segmentation allows each component to perform its specific function optimally while working together to restore overall joint functionality despite the surgical incision.
3Ease of operation
If the prosthesis allows full range of motion to replicate natural hip joint function, then mobility is improved, but the risk of dislocation increases due to abnormal strain from rapid movements or falls
Solution Approach 1:
The restricting portion modifies the motion range parameter by limiting extreme movements while preserving functional mobility. This parameter change creates an optimized motion envelope that maintains ease of operation for daily activities while eliminating the dangerous range where dislocation could occur from rapid or abnormal movements.
Data Source
AI summary
A medical device for implantation in a hip joint of a patient, the natural hip joint having a ball shaped caput femur integrated with a collum femur having a collum and caput center axis, extending longitudinal along the collum and caput femur, in the center thereof, as the proximal part of the femoral bone with a convex hip joint surface towards the centre of the hip joint and a bowl shaped acetabulum as part of the pelvic bone with a concave hip joint surface towards the centre of the hip joint, the medical device comprising; an artificial caput femur comprising a convex surface towards the centre of the hip joint, an elongated portion adapted to be connected to a prosthetic spherical portion of said artificial convex caput femur and fixated to the pelvic bone of the human patient,