Intravenous Catheter Needle Guard Dynamics
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Solution Overview
Problem
Intravenous catheter apparatuses face challenges with high withdrawal force and friction when a needle is withdrawn through a catheter hub protected by a needle guard, which can cause discomfort and increase the risk of accidental needle contact.
Innovation Solution
The design features a catheter hub composed of two parts with a chamber that accommodates the needle guard, preventing the guard's arms from contacting the inner surface, and a tension element to ensure the needle tip is safely covered, reducing friction and withdrawal force by allowing the arms to deflect outward during insertion and inward during retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a needle guard is added to protect the needle tip, then safety is improved, but withdrawal force and friction increase
Solution Approach 1:
The needle guard arms are designed to be movable rather than fixed, allowing them to deflect outward during needle insertion and inward during needle withdrawal. This dynamic movement enables the arms to clear the needle tip path during insertion while automatically positioning to protect the needle tip during withdrawal, resolving the contradiction between protection and withdrawal force.
Solution Approach 2:
The needle guard is divided into multiple arms that can independently deflect and move. This segmentation allows each arm to respond independently to the needle's movement, providing targeted protection where needed while minimizing interference with the needle withdrawal path, thereby reducing overall withdrawal force while maintaining protection.
2Reliability
If the needle guard arms are positioned to protect the needle tip, then safety is improved, but friction during insertion increases
Solution Approach 1:
The arms are designed with flexibility to deflect outward during insertion, allowing the needle to pass through with minimal resistance. After insertion, the arms return to their protective position, automatically providing protection without having been in the way during insertion. This dynamic positioning resolves the contradiction between protection and insertion smoothness.
3Reliability
If the housing is designed to accommodate the needle guard, then protection is improved, but device complexity increases
Solution Approach 1:
The needle guard is integrated into the catheter hub structure, with the arms formed as part of the hub assembly rather than separate components. This merging of functions reduces the number of separate parts and simplifies the overall structure while maintaining the protective function, thereby resolving the contradiction between protection and device complexity.
Data Source
AI summary
An intravenous catheter apparatus (10) comprising: a catheter tube (14); a catheter hub (12) having a distal end (22) and a proximal end (24), wherein the distal end (24) is joined to the catheter tube (14) and the proximal end (24) defines a housing (48); a needle (20) extending through the catheter hub (12) and the catheter tube (14) and defining an axial direction (A), wherein the needle (20) has opposite proximal and distal ends, the distal end forming a needle tip; a needle hub (16) attached to the proximal end of the needle (20); a needle guard (26) slidably arranged on the needle (20), wherein the needle guard (26) is movably retained in the housing (48) of the catheter hub (12), when the needle (20) extends through the catheter hub (12) and the catheter tube (14), wherein the needle guard (26) is removable from the catheter hub (12) once the needle tip is received in the needle guard (26) upon withdrawal of the needle (20) from the catheter tube (14), and wherein the housing (48) defines a chamber (54) at one end thereof ensuring that a first and second arm (40, 42) of the needle guard (26) do not engage or interact with an inner surface (56) of the chamber (54) prior and during venipuncture of a patient.