Prosthetic Implant Lateral Retention for Bone Preservation
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Solution Overview
Problem
Current prosthetic implants for joint replacement often require invasive procedures and result in significant bone loss and instability, limiting their effectiveness and adaptability for minimally invasive techniques.
Innovation Solution
The use of lateral retaining structures, such as T-shaped members and grommet features, within the prosthetic implant to secure it to the bone, reducing the implant's size and mass while facilitating minimally invasive surgical techniques and promoting bone preservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pegs and longitudinal fins are used for implant retention, then the implant can be securely retained in the bone, but the implant size and mass increase and more bone volume is lost during preparation
Solution Approach 1:
The patent transitions from conventional longitudinal retention features (pegs and fins extending along the implant axis) to lateral retention structures (protrusions extending perpendicular to the axis). This dimensional change allows the implant to be secured through side walls rather than requiring large longitudinal features, thereby reducing implant mass while maintaining retention reliability.
2Reliability
If conventional pegs and longitudinal fins are used for implant retention, then the implant can be securely retained in the bone, but the overall implant size increases
Solution Approach 1:
The patent employs lateral protrusions that extend perpendicular to the implant's longitudinal axis rather than using conventional longitudinal features. This allows retention functionality to be achieved with smaller overall implant dimensions, as the retention mechanism is distributed laterally rather than requiring extended longitudinal features.
3Reliability
If conventional invasive procedures are used for implantation, then the implant can be securely fixed, but significant bone loss occurs
Solution Approach 1:
The patent uses localized lateral protrusions at specific positions on the implant rather than requiring extensive bone resection and large retention features. This localized approach allows secure fixation to be achieved with minimal bone removal, preserving bone volume while maintaining implant fixation reliability.
4Loss of substance
If lateral retaining structures are used to reduce implant size, then bone volume loss is reduced, but the implantation procedure becomes more complex
Solution Approach 1:
The patent divides the retention function into multiple discrete lateral protrusions distributed around the implant rather than using a single large retention feature. This segmentation allows each protrusion to be relatively simple in structure while collectively providing secure retention, thus reducing overall implant complexity despite the distributed nature of the retention mechanism.
Data Source
AI summary
A prosthetic implant utilizes lateral retaining structures as part of the interior surface of the implant to more effectively secure and retain the implant while reducing the overall size and mass of the implant. In one embodiment, the prosthetic implant is provided with one or more T-shaped members extending from the inner surface of the implant, with the cross-member of the T-shaped member forming the laterally retaining structure that mate with a correspondingly shaped channel formed in the bone and are inserted into that channel at one or more oversize locations along the channel. In another embodiment, the prosthetic implant is provided with one or more retentions apertures in a projection structure extending inwardly from the inner surface of the implant that are laterally secured with a force fitted cross pin inserted through the retention aperture.