Bone Plate Bending Tool with Axial Locking Mechanism
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Solution Overview
Problem
Existing bone plate bending tools require manual grip and can cause the bone plate to shift or drop out during operation, leading to inaccurate bending and potential distortion of holes, which can prevent proper screw insertion.
Innovation Solution
A tool with a rod-shaped first and second member and a connection tubular member that allows for axial movement, providing a projection to insert into the bone plate's through-hole, which is then pinched between the members to securely hold and bend the plate without manual grip, using a threaded engagement and urging mechanism to maintain the pinching force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual grip operation is used to hold the bone plate during bending, then the operator can control the bending process, but the bone plate may shift or drop out when grip force is loosened
Solution Approach 1:
The bone plate bending tool uses a self-locking mechanism where the connection tubular member, upon axial movement, automatically restricts expansion between the sandwiching surfaces and immovably holds the bone plate through the projection inserted in the through-hole. This eliminates the need for continuous manual grip force while maintaining secure positioning.
Solution Approach 2:
The tool employs a dynamic locking mechanism where the connection tubular member can move axially to transition between locked and unlocked states. When moved forward axially, it restricts expansion and locks the bone plate in position; when moved backward, it releases the lock, enabling controlled operation while ensuring reliability during bending.
2Reliability
If the bone plate is held firmly during bending, then positioning stability is improved, but the holes may be distorted
Solution Approach 1:
The tool applies localized pinching force through the projection inserted in the through-hole and the sandwiching surfaces positioned at specific locations. This concentrates the holding force at precise points (the projection and sandwiching surfaces) while leaving the hole areas free from distortion, achieving both secure positioning and hole integrity.
Solution Approach 2:
The projection acts as an intermediary element that inserts into the through-hole to provide secure positioning without directly compressing or distorting the hole. It mediates between the need for firm holding and the requirement to preserve hole integrity, enabling the bone plate to be immovably held while maintaining hole shape for subsequent screw insertion.
3Reliability
If the bone plate is securely held without manual grip, then positioning stability is improved, but the device complexity increases
Solution Approach 1:
The bone plate bending tool is divided into functionally independent segments: the first member with the first sandwiching surface, the second member with the second sandwiching surface, and the connection tubular member with the projection. This segmentation allows each component to perform its specific function (sandwiching and locking) independently, achieving secure positioning through a relatively simple modular structure rather than a complex integrated system.
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
Prevents slippage and dropout of the bone plate during bending, maintains hole integrity, and allows for precise control of the bending process, ensuring accurate deformation and secure screw insertion.
Implementation Method 1
said connection tubular member that has moved forward in an axial direction restricts an expansion between said first sandwiching surface and said second sandwiching surface, and said first sandwiching surface and said second sandwiching surface, in cooperation with said connecting tubular member that has moved forward in said axial direction, pinchingly sandwich and immovably hold a peripheral edge of said through-hole of said bone plate
Implementation Method 2
said second member has a second member-side threadedly engaging portion provided at an outer side surface of a rear end portion of said second member, said connection tubular member has a tubular member-side threadedly engaging portion which is provided at an inner surface of said connection tubular member and screws with said second member-side threadedly engaging portion
Data Source
AI summary
A bone plate bending tool includes a substantially rod-shaped first member having a first sandwiching surface, a substantially rod-shaped second member slidable along a side part of the first member and having a second sandwiching surface, and a connection tubular member connected to the second member and enclosing a peripheral surface of the first member. A projection on one of the sandwiching surfaces is insertable into a through-hole of the bone plate and does not prevent the bone plate from being sandwiched between the sandwiching surfaces. The connection tubular member is axially movable on the peripheral surface of the first member while the second member is disposed on the first member's side part. The connecting tubular member that has moved axially forward restricts expansion between the sandwiching surfaces. The sandwiching surfaces, together with the forward-moved connecting tubular member, sandwich and immovably hold a peripheral edge of the bone plate through-hole.