Artificial Hip Joint Surfaces via Segmented Fixation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hip joint replacement surgeries for osteoarthritis are invasive, require lengthy hospitalization, and result in limited functional recovery due to the need to penetrate the hip joint capsule and risk of infection, with patients unable to perform strenuous activities post-surgery.
Innovation Solution
A medical device comprising artificial hip joint surfaces with convex and concave components that can be fixated to the femoral bone and pelvic bone without penetrating the cortex, using elastic members and self-locking mechanisms for secure fixation, allowing for minimally invasive procedures and reduced recovery time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal prosthesis is placed in Femur and a plastic bowl in Acetabulum through lateral incision penetrating the hip joint capsule, then the hip joint can be replaced to treat osteoarthritis, but the surgery becomes invasive with increased risk of infection and limited functional recovery
Solution Approach 1:
The medical device is divided into separate components: an artificial caput femur with convex surface and an artificial acetabulum with concave surface. These segmented components can be inserted through a single small puncture in the hip joint capsule rather than requiring extensive surgical incisions, thereby reducing tissue damage and infection risk while maintaining joint replacement functionality
Solution Approach 2:
A puncture needle serves as an intermediary tool to deliver the artificial joint surfaces through a small puncture in the hip joint capsule. This intermediary approach allows minimally invasive insertion of the prosthetic components, avoiding the need for large incisions and extensive dissection of surrounding tissues
2Reliability
If the hip joint capsule is penetrated to access the hip joint for prosthesis placement, then the joint can be replaced, but functional recovery is limited and patients cannot perform strenuous activities
Solution Approach 1:
The artificial joint is segmented into separate convex and concave surfaces that can be inserted independently through a small puncture. This segmentation enables minimally invasive delivery while maintaining the full functional capability of the joint, allowing patients to recover faster and perform strenuous activities sooner
Solution Approach 2:
The artificial convex surface and concave surface are designed to work together dynamically, with the convex surface rotating within the concave surface to enable natural hip joint movements. This dynamic design restores full range of motion and functional capability, enabling patients to perform strenuous activities after recovery
3Stability of the object's composition
If the artificial convex caput femur surface is fixated to the pelvic bone and artificial concave acetabulum surface is fixated to the femoral bone, then secure joint fixation is achieved, but the insertion procedure becomes complex
Solution Approach 1:
Instead of inserting the artificial acetabulum first and then the caput femur, the invention inverts the sequence by inserting the artificial caput femur with its convex surface first, followed by the artificial acetabulum with its concave surface. This inverted approach simplifies the insertion procedure while achieving stable fixation, as the convex surface can be delivered through the puncture needle more easily and then received by the concave surface
Data Source
AI summary
A medical device for implantation in a hip joint of a human patient, the natural hip joint having a ball shaped caput femur as the proximal part of the femoral bone with a convex hip joint surface towards the center of the hip joint and a bowl shaped acetabulum as part of the pelvic bone with a concave hip joint surface towards the center of the hip joint. The medical device comprising; an artificial caput femur, comprising a convex surface towards the center of the hip joint. The artificial convex caput femur is adapted to, when implanted: be fixated to the pelvic bone of the human patient, and be in movable connection with an artificial acetabulum surface fixated to the femoral bone of the patient, thereby forming a ball and socket joint. The medical device further comprises a fixation element comprising a fixation surface adapted to be in contact with the surface of the acetabulum and adapted to fixate the artificial convex caput femur to at least the acetabulum of the pelvic bone.