Telescoping Bone Fixation Nail With Sleeve And Locking Screw
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Solution Overview
Problem
Conventional bone fixation devices for intertrochanteric fractures suffer from medial and lateral migration of bone fixation nails, complexity in component adjustment, and reduced anchoring strength, leading to increased risk of further fractures and complications.
Innovation Solution
A telescoping multi-component bone fixation system with an outer sleeve and bone fixation nail, featuring a locking screw and endcaps to limit movement and enhance stability, allowing for adjustable positioning and reduced external stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional bone fixation devices are used, then the procedure is simple to perform, but the bone fixation nail migrates medially and laterally within the bone
Solution Approach 1:
The bone fixation nail is nested within the outer sleeve, allowing the nail to be positioned and stabilized by the sleeve's constraints while maintaining the ability to adjust its position. The locking screw then secures the nail at the desired position within the sleeve, preventing migration while keeping the device structure manageable.
Solution Approach 2:
The device transitions from a static conventional fixation device to a dynamic system where the bone fixation nail can be adjusted axially within the outer sleeve before being locked in place. This dynamic adjustment capability allows optimization of the nail position to prevent migration while accommodating individual patient anatomical variations.
2Adaptability or versatility
If conventional bone fixation devices are used, then the device structure is simple, but the degree of adjustability of components is minimized
Solution Approach 1:
The outer sleeve and bone fixation nail form a dynamic adjustable system where the nail can be positioned at different axial locations within the sleeve. The locking screw mechanism enables the system to transition from an adjustable state to a fixed state, providing both adaptability during implantation and stability after positioning.
Solution Approach 2:
The fixation device is segmented into distinct functional components: the outer sleeve providing structural constraints, the bone fixation nail providing anchoring, and the locking screw providing positional security. This segmentation allows each component to be optimized for its specific function while maintaining overall adjustability.
3Strength
If conventional bone fixation devices are used, then the number of components is reduced, but the anchoring strength of the devices is reduced
Solution Approach 1:
The nested configuration of the bone fixation nail within the outer sleeve creates a mechanically interlocked system that enhances anchoring strength. The sleeve constrains the nail laterally while the nail provides axial anchoring, and the locking screw prevents axial migration, creating a multi-directional stabilization system stronger than conventional single-component devices.
Solution Approach 2:
The dynamic adjustment capability allows the bone fixation nail to be positioned optimally within the bone anatomy before locking, enabling maximum engagement with the bone structure. This optimized positioning, combined with the multi-component structure, enhances anchoring strength by ensuring the fixation elements engage the strongest available bone regions.
Data Source
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AI summary
A device for bone fixation comprises a bone fixation nail extending from a proximal end to a distal end, the distal end having a helical structure configured to engage a bone, the proximal end having an opening extending thereinto and a first sleeve configured for insertion over a proximal portion of the bone fixation nail and through an intramedullary nail hole, the first sleeve permitting the bone fixation nail to move axially therewithin within a predetermined range of movement along with a locking screw configured to limit movement of the bone fixation nail relative to the first sleeve, the locking screw configured to lockingly engage the opening in the bone fixation nail and having a head and a threaded shaft extending distally therefrom.