Osseointegration Implant with Self-Centering Nut and Compression Screw
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Solution Overview
Problem
Current osseointegration systems for prosthetic limbs face challenges such as wound issues, loss of suction, and difficulties in fitting due to volume changes and short residual limbs, necessitating improved attachment structures that can secure with minimal residual bone and be easily removable without significant bone destruction.
Innovation Solution
The development of osseointegration devices featuring self-centering/nut configurations, centering devices with adjustable diameters, tapered mounting screw holes, and coupling devices with bias members to securely attach prosthetic limbs to bone, allowing for minimal bone engagement and easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional socket-based prosthetic attachment is used, then attachment to residual limb is achieved, but wound issues, loss of suction, and difficulties with volume changes occur
Solution Approach 1:
The patent replaces the traditional socket-based suction attachment system with an osseointegration system that uses direct bone-to-prosthesis attachment through titanium implants. This substitution eliminates the soft tissue interface that causes wound issues and suction loss, providing a more reliable mechanical connection directly to the skeletal structure.
2Reliability
If osseointegration implants are used to secure prosthetics, then attachment reliability improves, but bone destruction occurs during removal
Solution Approach 1:
The implant system is divided into separate components: a titanium implant fixture that integrates with the bone, an abutment that connects to the implant, and a prosthetic component. This segmentation allows the implant fixture to remain permanently integrated with minimal bone destruction, while the prosthetic components can be detached and replaced as needed without affecting the bone integration.
3Strength
If compression is applied to secure the implant to bone, then attachment strength improves, but removal becomes difficult
Solution Approach 1:
The fastening system uses a dynamic compression mechanism with a compression screw that can be adjusted between tightened and loosened states. During implantation, the screw is tightened to apply compression force for strong attachment. During removal or adjustment, the screw can be loosened to release compression, enabling easy removal without permanent damage to the bone or implant.
4Manufacturing precision
If custom-fitted sockets are used for different residual limb sizes, then fit accuracy improves, but device complexity and fitting difficulty increase
Solution Approach 1:
The osseointegration implant system provides a universal attachment method that works across different residual limb sizes and bone structures. The titanium implant fixtures can be placed in the iliac crests or other suitable bone locations regardless of limb dimensions, eliminating the need for custom-fitted sockets for each patient while maintaining secure attachment.
Data Source
AI summary
Improved osseointegration devices and structures, including such structures that can be used in connection with prosthetic limbs. Examples include a self-centering implant/nut configuration, a centering device, a tapered mounting screw hole, a coupling device, and an aiming device. The devices are highly efficacious. For example, they can be secured with minimal residual bone, and may be removed without significant bone destruction.