Spinal Osteosynthesis Device with Modular Fixation Element
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Solution Overview
Problem
Existing osteosynthesis devices for spine treatment, such as pedicel screws, are inflexible and insecure in terms of positioning and fixation, requiring complex installation and having poor maneuverability for surgeons.
Innovation Solution
A fastening system that allows for a temporarily clampable osteosynthesis device, enabling a bone anchor to be assembled from a distal direction without the pressure piece being loaded during temporary clamping, and maintaining clamping independently even after instruments are removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bone anchor with larger outer diameter is used, then the anchoring strength is improved, but the mounting becomes problematic when the outer diameter exceeds the opening diameter of the fork head
Solution Approach 1:
The bone anchor is divided into two separate components: a bone screw portion that is inserted into the bone and a ball head portion that is inserted into the fork head. This segmentation allows the bone screw to have a large outer diameter for strong anchoring while the ball head can be separately matched to the fork head opening diameter, resolving the contradiction between anchoring strength and mounting ease.
2Force
If the pressure piece is used to generate temporary clamping force, then the clamping effect is achieved, but the pressure piece experiences increased combined compression and bending stress limiting the maximum clamping effect
Solution Approach 1:
The temporary clamping function is extracted from the pressure piece and transferred to the fixation element. The fixation element is movable along the transverse opening and can be actuated independently to generate temporary clamping force on the ball head, eliminating the combined compression and bending stress on the pressure piece and allowing for greater maximum clamping effect.
3Force
If the pressure piece is mechanically involved in temporary clamping, then the clamping is achieved, but the device height must be increased to accommodate the necessary material thickness
Solution Approach 1:
The temporary clamping mechanism is extracted from the pressure piece structure and implemented through the fixation element that moves along the transverse opening. This separation allows the pressure piece to maintain its original compact thickness while the fixation element provides the necessary clamping action, thereby reducing the overall device height.
4Reliability
If traditional osteosynthesis devices are used, then fixation is provided, but the devices require considerable space for implantation and adjustment and are difficult to handle
Solution Approach 1:
The device is segmented into modular components (bone screw, ball head, fork head, pressure piece, fixation element) that can be independently handled and assembled. The fixation element can be actuated through the transverse opening without requiring large instrument access spaces, improving handling ease while maintaining fixation reliability through the modular design.
Solution Approach 2:
The fixation element is designed to be movable along the transverse opening, allowing dynamic adjustment during surgery. This movability enables the surgeon to position the fixation element optimally for temporary clamping and final fixation, improving ease of operation while ensuring reliable fixation through the adjustable mechanism.
Data Source
Figure 1a~1b
Figure 2
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AI summary
The invention relates to an attachment system (300) for an osteosynthesis device, in particular for spinal treatment, having a main body (301) comprising: - a first receiving region (310) which is designed for receiving a connecting element; - a second receiving region (319) which is designed for receiving a bone anchor; - a third receiving region (313) having a linear transverse opening, the transverse opening having a first opening at its first end and a second opening at its second end; and - an axial opening (14) for receiving and guiding a positioning element (40); and the device further having a fixing element and a positioning element.