Crimping Device Thread Guide Dynamics for Suture Needle Bonding
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Solution Overview
Problem
Existing crimping devices for medical suture needles face issues where the thread guide exerts shearing forces on the suture thread during crimping, causing damage, and adjusting the guide to prevent this is difficult, especially when the needle thickness varies.
Innovation Solution
A crimping device with a thread guide that moves in a way to prevent external forces on the suture thread, using a combination of fixed and movable dies and a guide with angled faces to smoothly insert the thread into the stop hole without reducing the hole size, thereby avoiding shearing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the thread guide is fixed in position during crimping, then the guide face can provide stable guidance for the suture thread, but the stop hole size reduces during crimping causing the thread to be bent or damaged by the thread guide
Solution Approach 1:
The thread guide is made movable in the crimping direction to dynamically adjust its position during the crimping process. This allows the guide face to remain aligned with the stop hole edge throughout crimping, preventing the thread from being bent or damaged while maintaining stable guidance. The movable thread guide synchronizes its position with the changing stop hole size, eliminating the harmful shearing force.
2Object-affected harmful factors
If the thread guide is moved to prevent shearing force on the suture thread, then thread damage is avoided, but the adjustment becomes difficult when needle thickness varies
Solution Approach 1:
The thread guide is designed with a universal adjustment mechanism that can adapt to different needle thicknesses. The guide position can be adjusted along the crimping direction to accommodate varying stop hole sizes while maintaining the same guiding function. This multi-position capability allows the single thread guide structure to serve multiple needle specifications without requiring separate guides for each thickness.
3Strength
If the stop hole size is reduced during crimping, then the suture needle is properly bonded, but the axis of the stop hole displaces causing the suture thread to be bent
Solution Approach 1:
The thread guide position is dynamically adjusted during crimping to track the displacement of the stop hole axis. As the stop hole size reduces and its axis displaces, the thread guide moves correspondingly to maintain alignment between the guide face and the stop hole edge. This dynamic tracking ensures the suture thread remains properly aligned throughout the crimping process, preventing bending while achieving proper bonding.
Data Source
AI summary
A crimping die including a fixed die and a moving die which moves away from or toward the fixed die, and a thread guide arranged closely to the edge of the stop hole formed in the proximal end face of an eyeless needle held by the crimping die and having a surface for guiding the suture thread to the stop hole. The thread guide is arranged such that an external force does not act on the suture thread on the outside of the stop hole formed in the eyeless needle as a crimping operation progresses when the proximal end face of the eyeless needle is crimped by the crimping die, or arranged to move in the direction in which an external force does not act.