Slotted-Tip Screwdriver for Reliable Screw Retention
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Solution Overview
Problem
Existing screwdriver solutions for retaining screws during insertion into a target site, such as bone, are costly and complex, often leading to screws falling or becoming lost due to disengagement.
Innovation Solution
A screwdriver with a slotted tip that expands radially outward upon insertion into a screw head recess, using mechanisms like a cannulated insert or a slidable sleeve to lock the tip within the recess, allowing easy disengagement when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conical screwdriver tip or clamp mechanism is used to retain the screw, then the screw retention reliability is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The screwdriver tip is segmented into two separable portions that can move relative to each other. The slot allows the portions to separate radially outward to engage the screw recess, providing reliable retention without requiring complex additional mechanisms.
Solution Approach 2:
The screwdriver tip transitions from a static structure to a dynamic one where the two portions can move radially outward and inward. This dynamic movement allows the tip to adapt between engaged and disengaged states with simple radial motion rather than complex mechanical linkages.
2Reliability
If a sliding shaft or threaded connection is used to secure the screw, then the screw retention reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The tip is divided into two portions that can be manufactured separately and assembled with a simple slot, avoiding complex sliding shafts or threaded connections. This segmentation enables straightforward manufacturing while achieving reliable screw retention.
3Reliability
If the screwdriver tip is designed to expand radially outward to lock into the recess, then the screw retention reliability is improved, but the device complexity increases
Solution Approach 1:
The tip employs simple radial movement of two portions rather than complex expansion mechanisms. The portions move outward along the slot to engage the recess and can be easily returned to the center, providing reliable retention with minimal mechanical complexity.
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
Provides reliable screw retention during insertion and removal without additional complexity or cost, ensuring the screw remains attached to the screwdriver until intentionally detached.
Implementation Method 1
The slot permits opposed portions of the screw engaging tip to spread apart from one another into a locking configuration in which the opposed portions apply a radially outward force against an interior surface of a recess
Implementation Method 2
a distal end of the screw engaging tip includes a chamfer configured to engage an edge of a recess into which the screw engaging tip is to be inserted so that, as a distally directed force is applied to the screwdriver against the edge of the recess, the chamfer forces the opposed portions of the screw engaging tip together
Data Source
AI summary
A screwdriver includes a body extending longitudinally from a proximal end to a distal end. The distal end includes a distal screw engaging tip. The screwdriver also includes a slot extending through a width of the screw engaging tip and extending proximally a distance into the body. The slot permits opposed portions of the screw engaging tip to spread apart from one another into a locking configuration in which the opposed portions apply a radially outward force against an interior surface of a recess in a head of a screw into which the screw engaging tip has been inserted to releasably lock the screw engaging tip within the recess.