Blood Collection Pen Needle Locking for Safe Needle Installation
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Solution Overview
Problem
Traditional blood collection pens have complex use steps and expose the needle tip during unscrewing and unscrewing operations, posing a risk of injury, and there is a risk of harm if the blood collection needle is not properly installed before use.
Innovation Solution
A blood collection pen design featuring a guide sleeve, inner core with an elastic structure, and a needle retraction rod that prevents the needle from being ejected unless properly installed, ensuring safety by locking the needle in place until correct assembly is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle mounting mechanism allows direct installation of the blood collection needle into the needle seat, then the ease of operation is improved, but the reliability deteriorates due to the risk of harm if the needle is not installed in place
Solution Approach 1:
The patent applies preliminary anti-action by designing a needle installation detection mechanism that prevents the launching operation unless the needle is properly installed. The detection mechanism detects whether the needle is correctly mounted in the needle seat before allowing the launching key to operate, thereby preventing harmful effects of improper needle installation while maintaining ease of operation.
2Ease of operation
If the pen cap is unscrewed to install the needle and discard the needle, then the ease of operation is improved, but the object-affected harmful factors increase due to exposure of the needle tip
Solution Approach 1:
The patent applies preliminary action by providing a protective cover that automatically covers the needle tip when the pen cap is unscrewed for needle installation or disposal. The protective cover is pre-positioned on the pen cap and automatically engages to protect the needle tip during handling operations, thereby reducing the risk of needle tip injury while maintaining ease of operation.
3Object-affected harmful factors
If the protective cover is designed to automatically cover the needle tip when the pen cap is unscrewed, then the object-affected harmful factors are reduced, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the protective cover function with the existing pen cap structure. The protective cover is combined with the pen cap such that it automatically covers the needle tip when the pen cap is unscrewed, eliminating the need for a separate protective mechanism and thereby reducing device complexity while still reducing the risk of needle tip injury.
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
Simplifies the use steps and ensures the needle tip is protected during handling, preventing accidental injuries and ensuring the pen can only be used safely when the needle is correctly installed.
Implementation Method 1
the inn core includes an elastic structure which is adapted for abut against an inner wall of the guide sleeve in the axial direction; and the elastic structure is adapted to abut against the needle retraction rod in a transverse direction to prevent a part of the elastic structure that abuts against the inner wall of the guide sleeve from elastically deforming or moving laterally inward
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
The present disclosure relates to a blood collection pen, including: a guide sleeve (5); an inner core (2), a front end of which is provided with a needle mounting mechanism for detachably installing a blood collection needle, and a rear end of which passes through the guide sleeve; a needle retraction rod (3) provided through the inner core in an axial direction, a front end of the needle retraction rod being adapted for passing through an inner core hole at a front end of the inner core; wherein: the inn core includes an elastic structure which is adapted for abut against an inner wall of the guide sleeve in the axial direction; and the elastic structure is adapted to abut against the needle retraction rod in a transverse direction to prevent a part of the elastic structure that abuts against the inner wall of the guide sleeve from elastically deforming or moving laterally inward in a case that the blood collection needle is not installed at the front end of the inner core.