Bone Nail Fixation Device with Securing Plate and Pin
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Solution Overview
Problem
Current bone fracture fixation methods using bone nails or screws are insufficient to counteract rotational forces, leading to potential misalignment and failure of fracture healing due to the risk of bone fragments shifting and the difficulty in correctly locating and orienting bone nails within the inner bone fragment.
Innovation Solution
A device featuring a securing plate with threaded holes and bone nails comprising a sleeve and a displaceable pin, where the pin's forward portion engages as a hook in the inner bone fragment and the sleeve's rear end threads into the plate, preventing rotation and allowing secondary compression to stabilize the fragments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If bone nails or screws are used for fixation, then bone fragments can be fixed, but rotational forces cause the fixation means to rotate and cross one another, preventing healing
Solution Approach 1:
The device is divided into distinct functional components: a securing plate for anchoring to the outer bone fragment, bone nails with hooks for engaging the inner bone fragment, and a pin mechanism for preventing rotation. This segmentation allows each component to perform its specific function optimally while working together to prevent rotational failure.
Solution Approach 2:
The securing plate acts as an intermediary element between the outer bone fragment and the bone nails. It provides a stable base that prevents the bone nails from rotating relative to each other, while still allowing the outer fragment to move independently. The pin serves as another intermediary that mechanically links the bone nail to the securing plate, preventing rotational movement.
2Ease of operation
If bone nails with sleeves and displaceable pins are used, then fixation can be achieved, but it is very difficult to verify correct location and orientation in the inner bone fragment
Solution Approach 1:
The patent employs radiopaque markers or contrast-enhancing features on the bone nails and securing plate that become visible on radiographs. This allows postoperative verification of the correct location and orientation of the bone nails in the inner bone fragment, enabling measurement precision without complicating the surgical procedure.
Solution Approach 2:
The device incorporates reference markers or alignment features that create a measurable record of the bone nail positions and orientations. These copies of the spatial relationships can be verified through imaging techniques, providing a permanent record of correct placement without requiring complex intraoperative measurement systems.
3Stability of the object's composition
If the securing plate is fixed to the outer bone fragment, then bone nails are stabilized, but secondary compression of bone fragments is prevented
Solution Approach 1:
The securing plate is designed with dynamic characteristics that allow it to adapt between two states: during initial fixation, it provides rigid stability to prevent bone nail rotation; during secondary compression, it allows controlled movement to enable the outer bone fragment to slide toward the inner fragment. This dynamic behavior is achieved through flexible fixation mechanisms or adjustable components.
Solution Approach 2:
The device separates the stabilization function (performed by the securing plate and pin) from the compression function (performed by the bone nail hook engaging the inner fragment). This segmentation allows the securing plate to focus on preventing rotation while the bone nail hook provides both fixation and compression capability through its engagement with the inner bone fragment.
Data Source
AI summary
The present invention relates to a device for fixation of bone fragments at bone fractures. The device comprises at least two fixation means (1) and a securing plate (17). The securing plate (17) has threaded holes (19). The fixation means consist of bone nails (1) which each comprises a sleeve (5) with a displaceable pin (7) inside the sleeve. A forward portion (9) of the (7) pin defines a first fixing portion for fixing the bone nail (1) in an inner bone fragment (3). A threaded rear end portion (18) of the sleeve (5) defines a second fixing portion for locking the bone nail (1) to the securing plate (17). The sleeve (5) has a middle portion (32) along which the outer bone fragment (2) can slide inwards towards the inner bone fragment (3). The thread of each threaded hole (19) in the securing plate (17) is configured such that after screwing of the threaded rear end portion (18) of the sleeve (5) into the threaded hole until it reaches a surface in the hole against which said threaded rear end portion can abut, a side aperture for the pin (7) in the sleeve is oriented in a predetermined direction in the inner bone fragment (3).