Self-Locking Screwdriver Guide Tube Blocking System
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Solution Overview
Problem
Existing screwdrivers for orthopedic implants can become detached from the connector under external resistance, leading to poor guidance and weakened clamping of the implant in osseous tissues.
Innovation Solution
A self-locking screwdriver with a guide tube and clamping rod, featuring a blocking system with a retractable stop and gripping wheel, which locks the screwdriver onto the implant during anchoring and prevents loosening, ensuring secure rotational drive and immobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a removable screwdriver is used to anchor bone screws for orthopedic implants, then the screwdriver can be easily assembled and disassembled, but the screwdriver can become detached from the connector under external resistance, causing poor guidance and weakened clamping
Solution Approach 1:
The blocking system transitions from a static to a dynamic state through the retractable stop mechanism. The stop can be retracted to allow assembly/disassembly and extended to provide locking engagement during operation, making the system adaptive to different operational phases
Solution Approach 2:
The retractable stop acts as an intermediary element between the guide tube and the connecting rod. It mediates the interaction by providing a blocking function that prevents detachment while allowing controlled movement during assembly and disassembly operations
2Reliability
If a blocking system is added to prevent detachment of the screwdriver from the connector, then the reliability of secure engagement is improved, but the device complexity increases
Solution Approach 1:
The blocking system is merged with the existing guide tube structure. The retractable stop is integrated into the guide tube, and the blocking function is combined with the rotational drive mechanism, reducing the need for separate independent components
Solution Approach 2:
The gripping wheel serves multiple functions: it provides the blocking action through the retractable stop, transmits rotational torque to the clamping rod, and controls the locking/unlocking sequence. This multi-functionality reduces the number of separate components needed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The screwdriver maintains secure engagement with the orthopedic implant during tightening and prevents detachment, enhancing the stability and effectiveness of the implant anchoring process.
Implementation Method 1
a blocking system consisting of a connecting rod comprising on its periphery a series of teeth cooperating according to the direction of rotation of said rod with a retractable stop arranged in the guide tube
Implementation Method 2
inside the first space of the gripping wheel, a cam whose external profile comes into contact with the inclined face of the opening of the retractable stop
Implementation Method 3
a connecting device consisting, on the one hand, of a blind internal bore and, on the other hand, of an elastically deformable lamella arrangement for receiving and blocking the clamping rod in translation and rotation
Data Source
AI summary
The self-locking screwdriver includes a guide tube inside which a clamping rod is guided and rotatably driven, one end of which is provided with a cavity which allows the rotational drive and tightening of an anchoring screw, ensuring the immobilization of an orthopedic implant against an osseous body of an individual, the screwdriver including, on the one hand, between The guide tube and the clamping rod, a blocking system cooperating with the guide tube in order to prevent the latter from being loosened from the orthopedic implant when the anchoring screw is tightened and, on the other hand, on the outer periphery of the guide tube, a gripping wheel for locking and/or unlocking the blocking system and the rotational drive of the guide tube.