Capsule-Preserving Hip Joint Fixation via Pelvic Bone Access
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Solution Overview
Problem
Current hip joint replacement surgeries for osteoarthritis are invasive, requiring significant hospitalization and recovery time, and often result in limited functional hip movements due to damage to the hip joint capsule and prolonged strain restrictions.
Innovation Solution
A medical device comprising artificial hip joint surfaces with convex and concave forms that can be fixated to the pelvic and femoral bones using various mechanical connecting members, allowing for minimally invasive insertion and fixation without penetrating the cortex, and potentially using self-lubricating materials like PTFE for reduced wear and tear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hip joint replacement surgery is performed with lateral incision and capsule penetration, then the hip joint can be accessed for prosthesis implantation, but the hip joint capsule is damaged leading to limited functional movements and prolonged recovery
Solution Approach 1:
Instead of approaching the hip joint from the lateral side through the capsule, the invention inverts the approach by accessing the hip joint through the pelvic bone from the front. The artificial caput femur is inserted through a hole created in the pelvic bone, allowing capsule-preserving implantation while maintaining full hip joint functionality.
2Ease of manufacture
If traditional hip joint replacement surgery is performed, then the prosthesis can be implanted, but one week of hospitalization and 6 weeks of recovery with strain restrictions are required
Solution Approach 1:
The invention segments the implantation procedure into minimal invasive steps: creating a small hole in the pelvic bone, inserting the artificial caput femur through the hole, and fixing it with screws. This segmented approach avoids extensive soft tissue dissection and capsule penetration, enabling same-day discharge and rapid recovery within 1-2 weeks.
3Object-affected harmful factors
If the artificial hip joint surface is inserted through a hole in the pelvic bone, then minimally invasive insertion is achieved, but the hole creation and fixation process becomes complex
Solution Approach 1:
The invention performs preliminary actions by pre-drilling the hole in the pelvic bone and pre-positioning the artificial caput femur before final fixation. The hole is created through the pelvic bone cortex, and the prosthesis is temporarily held in position before being secured with screws, simplifying the overall complex process into manageable sequential steps.
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 a more functional and durable artificial hip joint with reduced recovery time and strain limitations, allowing for improved mobility and reduced risk of infection and wear, while maintaining the natural hip joint's functionality.
Implementation Method 1
potentially using self-lubricating materials like PTFE for reduced wear and tear
Data Source
AI summary
A method for fixating an artificial convex caput femur surface to the pelvic bone of a patient, the method comprising the steps of: exposing the acetabulum surface, creating a hole or recess in the pelvic bone from the acetabulum side of the pelvic bone, providing the artificial convex caput femur, comprising an elongated member to the hip joint, inserting said elongated member in said hole, and performing an action on the acetabulum side of the pelvic bone such that the elongated member is structurally changed on the abdominal side of the pelvic bone or inside the pelvic bone.