Osteosynthesis Plate with Triangular Recess for Transverse Positioning
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Solution Overview
Problem
Existing osteosynthesis systems for distal bone fractures lack the ability to achieve precise transverse positioning, leading to potential discomfort for patients due to protrusions and difficulties in correcting lateral positioning defects.
Innovation Solution
An osteosynthesis system featuring a plate with an enlarged epiphyseal part and a diaphyseal part that includes an oblong orifice for longitudinal adjustment, along with a removable adjustment piece allowing both longitudinal and transverse movement, enabling precise positioning of the plate on the bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a plate with only longitudinal adjustment (oblong hole) is used, then the device complexity is reduced, but the positioning precision in transverse direction deteriorates
Solution Approach 1:
The adjustment system is segmented into two independent components: an oblong hole for longitudinal adjustment and a triangular recess with adjustment piece for transverse adjustment. This segmentation allows each component to specialize in one direction of adjustment, achieving precise positioning in both directions without requiring a complex multi-directional adjustment mechanism.
Solution Approach 2:
The triangular recess acts as an intermediary structure that enables transverse adjustment. By providing a recess that receives an adjustment piece with a pin, the system introduces a mediating mechanism that facilitates precise transverse positioning without complicating the overall plate structure.
2Manufacturing precision
If transverse adjustment is added to the plate, then the positioning precision is improved, but the device complexity increases
Solution Approach 1:
The plate structure applies local quality by providing different adjustment capabilities in different regions: the oblong hole provides longitudinal adjustment capability while the triangular recess provides transverse adjustment capability. This localized approach to adjustment functionality allows precise positioning without requiring the entire plate structure to be complex.
Solution Approach 2:
The adjustment piece with pin provides dynamic transverse adjustment capability. The pin can slide within the triangular recess to adjust the transverse position of the plate relative to the bone, enabling dynamic positioning in both longitudinal and transverse directions during the surgical procedure.
3Device complexity
If the plate position cannot be corrected in transverse direction, then the device complexity is reduced, but the patient comfort deteriorates due to protrusions
Solution Approach 1:
The triangular recess and adjustment piece enable preliminary transverse positioning adjustments before final plate fixation. By allowing transverse adjustment during the surgical procedure, the system prevents the need for post-operative protrusions that would cause patient discomfort.
4Manufacturing precision
If re-drilling is performed to correct lateral positioning, then the positioning precision can be improved, but the difficulty of operation increases due to hole proximity
Solution Approach 1:
The adjustment piece with pin provides a dynamic mechanism for transverse positioning adjustment that operates independently of the fixing holes. This dynamic adjustment capability allows lateral positioning correction without requiring additional drilling operations, maintaining surgical operation ease while achieving positioning precision.
Data Source
Figure 1~3
Figure 4A~4C
Figure 5A~5C
AI summary
The invention relates to an osteosynthesis system (S), for reducing a distal fracture (F) of an elongate bone, and to the corresponding reduction method. The system includes a plate, provided with an epiphyseal portion comprising a substantially triangular recess and a diaphyseal portion including an oblong opening, and a removable adjustment part (9), a proximal portion of which is wider than the oblong hole and a distal portion of which is of a length L' that is greater than the length L of the recess, said adjustment part having an opening (17) suitable for placing a screw (18) for transversely positioning the plate in relation to the bone.