Strain-Releasing Hip Prosthesis for Loosening Prevention
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Solution Overview
Problem
Hip joint prostheses often experience complications such as dislocation and loosening due to abnormal strain, which can lead to further damage and require invasive surgical procedures for correction.
Innovation Solution
A medical device with a releasing member that changes states in response to pre-determined strain, allowing for non-invasive adjustment and reduction of strain on the femoral bone, comprising a ball-shaped piece and a bowl-shaped piece that can be implanted through a small hole in the pelvic bone, using elastic, magnetic, or rupture-based mechanisms for secure attachment and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a completely fixed hip joint prosthesis is used to prevent dislocation, then dislocation risk is reduced, but the risk of prosthesis loosening from femoral bone fixation increases due to excessive strain on the bone
Solution Approach 1:
The prosthesis incorporates a dynamic releasing member that can change state in response to applied strain. This member transitions from a locked state (preventing dislocation) to a released state (reducing strain on bone fixation) when excessive force is detected, allowing the system to adapt between stability and strain protection
Solution Approach 2:
The releasing member is designed with strain-responsive characteristics that allow it to anticipate and respond to excessive forces before they cause damage. The member is pre-configured to detect critical strain levels and automatically release, cushioning the bone fixation from damaging loads
2Ease of manufacture
If traditional hip joint surgery is performed with large incisions and capsule penetration, then prosthesis installation is achieved, but damage to surrounding structures and extended recovery time occur
Solution Approach 1:
The prosthesis is divided into separable components (first piece and second piece) connected by a releasing member. This segmentation allows for minimally invasive insertion through small holes in the bone, avoiding large incisions and extensive tissue disruption while maintaining functional integrity
Solution Approach 2:
The first and second pieces are designed to fit together with the releasing member, creating a nested configuration that can be inserted through small access holes. The components nest within each other during insertion, minimizing the surgical opening required and reducing damage to surrounding tissues
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 device reduces the risk of damaging human structures and interconnections, enabling non-invasive reinstatement of the hip joint without surgical procedures by releasing the ball-shaped piece from the bowl-shaped piece when excessive strain is applied, thereby minimizing the risk of loosening and dislocation.
Implementation Method 1
The releasing member is adapted to change from the first state to the second state when a pre-determined strain is placed on the releasing member
Implementation Method 2
using elastic, magnetic, or rupture-based mechanisms for secure attachment and release
Implementation Method 3
using elastic, magnetic, or rupture-based mechanisms for secure attachment and release
Data Source
AI summary
A medical device for implantation in a hip joint of a patient is provided. The medical device comprising a first piece being adapted to be fixated to the femoral bone and a second piece adapted to be fixated to the pelvic bone. The medical device further comprises a releasing which in a first state is adapted to hold said first piece attached to said second piece, and in a second state release said first piece from said second piece. The releasing member is adapted to change from said first state to said second state when a predetermined strain is placed on said releasing member by the connection with the first or second piece. The medical device further comprises a calibration member for calibrating the pre-determined strain required for said releasing member to change from said first state to said second state.