Long-Bone Fracture Fixation With Direct Plate-to-Implant Locking
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Solution Overview
Problem
Existing revision total hip arthroplasty procedures face challenges with the loosening of tensioned cables and detachment of bone fragments due to slippage or erosion, hindering proper bone regeneration and healing.
Innovation Solution
A bone fixation system comprising a femoral implant with angled openings and a bone plate with prongs and openings, along with a drill guide, to provide secure fixation and alignment, using locking bolts and screws for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a trochanteric grip plate and cabling system are used to compress and secure detached bone fragments, then bone fragments can be temporarily fixed, but the tensioned cables loosen over time due to slippage or erosion, preventing proper bone healing
Solution Approach 1:
The patent removes the cable component from the fixation system entirely, replacing it with a direct bone-to-implant fixation mechanism. The grip plate is secured to the implant through holes in the implant body, eliminating the intermediate cable element that was prone to slippage and erosion, thereby resolving the reliability issue while maintaining fixation stability.
Solution Approach 2:
The patent introduces a new intermediary mechanism - the hole structure in the implant body that directly receives the grip plate. This intermediary feature provides a stable, erosion-resistant connection between the grip plate and implant, replacing the cable's function while eliminating its vulnerabilities to slippage and tissue erosion.
2Force
If tensioned cables are used to secure detached bone fragments, then compression and fixation can be achieved, but the cables slip under tension or erode due to soft tissue and bone contact
Solution Approach 1:
The cable is completely removed from the system. The compression and fixation functions are achieved through the grip plate's direct mechanical connection to the implant via holes in the implant body, eliminating the cable's harmful interaction with soft tissue and bone while maintaining the necessary compression force.
Solution Approach 2:
The patent changes the fundamental parameter of the fixation mechanism from a flexible cable system to a rigid, direct mechanical connection. The holes in the implant body provide a fixed, non-eroding pathway that maintains compression force without the slippage and erosion problems of cable-based systems.
3Productivity
If conventional fixation methods are used in revision THA, then initial fixation can be achieved, but bone fragments detach or cables loosen, hindering bone regeneration
Solution Approach 1:
The patent removes the problematic cable element that caused slippage and erosion, replacing it with a direct hole-based fixation mechanism. This extraction of the harmful component allows the fixation system to maintain reliability throughout the healing process, thereby improving bone regeneration efficiency.
Solution Approach 2:
The hole structure in the implant body serves as a reliable intermediary that directly connects the grip plate to the implant. This intermediary feature provides consistent, erosion-resistant fixation that maintains reliability during the critical healing period, enabling effective bone regeneration without the setbacks caused by cable failure.
Data Source
AI summary
In one embodiment, the present disclosure relates to a kit for providing fixation of a proximal portion of a femur of a patient. The kit includes an implant including a stem and a neck extending from the stem along a first axis, and the stem includes a stem opening for receipt of a locking bolt. The stem opening is centered along a second axis transverse to the first axis, and the first axis extends through a first plane defined by a first end of the stem, a second end of the stem, and the first axis. The kit also includes a bone plate which includes a bone plate opening for receipt of the locking bolt, and the locking bolt is configured to pass through the bone plate opening and into the stem opening to secure the bone plate to the implant.