Inverted Hip Joint Implant with Segmented Femoral Head
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Solution Overview
Problem
Current treatments for hip joint osteoarthritis, such as hip replacement surgery, involve invasive procedures with significant recovery time and risk of infection, and do not fully replicate the natural functionality of the hip joint.
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 using various mechanical connecting members, allowing for minimally invasive insertion and reduced penetration of bone cortex, utilizing materials like polyethylene and PTFE for durability and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hip replacement surgery is performed with lateral incision and penetration of hip joint capsule, then access to hip joint is achieved, but the hip joint capsule is damaged making it difficult to achieve fully functional joint after surgery
Solution Approach 1:
The patent inverts the traditional surgical approach by accessing the hip joint through the pelvic bone rather than through the hip joint capsule. The artificial caput femur is inserted through a hole created in the pelvic bone, avoiding penetration and damage to the hip joint capsule, thereby preserving its integrity and enabling fully functional joint recovery
2Reliability
If traditional hip replacement surgery is performed, then hip joint prosthesis is replaced, but recovery time is increased with one week hospitalization and 6 weeks recovery
Solution Approach 1:
The patent segments the artificial caput femur into multiple parts that can be inserted separately through a small hole in the pelvic bone. The caput femur is divided into a first part and a second part that are inserted sequentially, allowing for minimally invasive surgery with reduced recovery time compared to traditional complete prosthesis replacement
Solution Approach 2:
The patent employs a flexible or expandable structure where the artificial caput femur parts can be compressed or folded to fit through a small insertion hole, then expanded or assembled to their final functional configuration inside the hip joint, enabling minimally invasive insertion
3Reliability
If traditional hip replacement surgery is performed, then prosthesis is implanted, but risk of infection is increased
Solution Approach 1:
The patent divides the implantation procedure into segmented steps with the caput femur inserted in parts through a small hole, reducing the size of the surgical wound and exposure time, thereby lowering the risk of postoperative infection compared to traditional open surgery
4Ease of operation
If artificial caput femur is inserted through hole in pelvic bone, then minimally invasive treatment is achieved, but mechanical connection and fixation must be ensured
Solution Approach 1:
The artificial caput femur is divided into multiple parts that are inserted sequentially through the hole in the pelvic bone. This segmentation allows for minimally invasive insertion while the parts are designed to assemble and mechanically connect inside the hip joint, ensuring proper fixation and structural integrity
Solution Approach 2:
The patent employs a nested structure where one part of the artificial caput femur is inserted inside another part. The first part and second part are nested during insertion, allowing compact placement through the small hole while maintaining mechanical strength and proper articulation in the final configuration
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
The solution enables a more functional and minimally invasive treatment for hip joint osteoarthritis, reducing recovery time and infection risk while providing a durable and lubricated artificial joint surface that supports normal hip movements.
Implementation Method 1
utilizing materials like polyethylene and PTFE for durability and lubrication
Data Source
AI summary
A medical device for treating hip joint osteoarthritis in a human patient by providing at least one artificial hip joint surface is provided. The 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 etabulum as part of the pelvic bone with a concave hip joint surface towards the center of the hip joint. The medical device comprises the artificial hip joint surface comprising at least one of; an artificial caput femur or an artificial caput femur surface comprising, a convex form towards the center of the hip joint, and an artificial acetabulum or an artificial acetabulum surface comprising, a concave form towards the center of the hip joint. The artificial convex caput femur or the artificial convex caput femur surface is adapted to be fixated to the pelvic bone of the human patient and the artificial concave acetabulum or artificial concave acetabulum surface is adapted to be fixated to the femoral bone of the human patient.