Percutaneous Vertebral Osteosynthesis Assembly with Side-Loading Connectors
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Solution Overview
Problem
Traditional vertebral osteosynthesis techniques cause significant trauma and tissue damage due to the difficulty in connecting bars with anchor members, leading to prolonged operations and noticeable scarring.
Innovation Solution
A percutaneous vertebral osteosynthesis assembly using 'side loading' connecting pieces and tubular handling instruments that facilitate easy engagement of the connecting bar with anchor members, reducing tissue trauma and operation duration by allowing precise placement and controlled dissection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional open surgery technique is used to place anchor members and connecting bars, then reliable vertebral immobilization is achieved, but significant tissue trauma and large scars are caused
Solution Approach 1:
The procedure is divided into separate percutaneous steps: first placing anchor members through small incisions, then separately introducing connecting bars through the same incisions using guiding instruments. This segmentation allows each component to be placed minimally invasively while maintaining the reliability of the final immobilization construct.
2Object-affected harmful factors
If percutaneous technique with blind connecting bar engagement is used, then tissue trauma is reduced, but difficulty in engaging connecting bar with screw channels increases
Solution Approach 1:
A tubular guiding instrument is introduced as an intermediary tool. The instrument has a longitudinal slot that guides the connecting bar into proper alignment with the screw channels, and engaging means at its distal end that directly engage the connecting bar. This intermediary device eliminates the need for blind engagement while maintaining percutaneous access and minimizing tissue trauma.
3Object-affected harmful factors
If percutaneous technique with large diameter instruments is used, then tissue trauma is reduced compared to open surgery, but instrument size still causes significant dissection
Solution Approach 1:
The connecting bar is introduced through a tubular guiding instrument, with the bar passing through a longitudinal slot in the instrument's wall. The engaging means are positioned at the distal end of the instrument, allowing the connecting bar to be grasped and engaged without requiring the instrument itself to have a large diameter. This nested arrangement allows precise control with a minimally invasive instrument size.
Data Source
AI summary
In this assembly; each connecting piece comprises engaging means situated outside said conduit for engaging a connecting bar and outside said conduit for engaging on an anchor member, making it possible to grasp said connecting piece using a handling instrument. The assembly comprises at least one handling instrument comprising engaging means complementary to those comprised by each connecting piece. According to the invention, each anchor member is equipped with a proximal shaft, the length of which is such that it protrudes past the patient's skin after implantation of said anchor member on a vertebra. Each handling instrument is tubular and can be engaged on the proximal shaft of each anchor member so as to allow the movement of a connecting piece grasped by the instrument along the proximal shaft of each anchor member.