Needle Connector Barb for Catheter Bonding
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Solution Overview
Problem
The existing methods for bonding a needle connector end to a catheter or cannula often result in disengagement or dislodgment under high pressure conditions, disrupting fluid communication during medical procedures.
Innovation Solution
A needle with a specifically configured connector end, featuring a formation such as a barb or bead, is used, which is secured with a curable material that hardens upon exposure to UV radiation, ensuring a stable bond with the catheter or cannula, preventing movement even under differential pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional bonding methods are used to attach needle connector end to catheter, then the bonding process is simple, but the bond strength is insufficient under high pressure conditions
Solution Approach 1:
The needle connector end is pre-formed with a barb structure before bonding, creating a mechanical interlock feature that enhances bond strength. This preliminary structural preparation allows the subsequent bonding process to achieve stronger attachment without requiring complex multi-step procedures, as the barb provides inherent mechanical reinforcement.
Solution Approach 2:
The bonding system combines mechanical interlocking (barb structure) with chemical bonding (adhesive material) to create a composite bonding mechanism. This dual approach integrates two different bonding principles - physical interlocking and chemical adhesion - to achieve superior overall bond strength that neither method could provide alone under high pressure conditions.
2Productivity
If high pressure fluid infusion is used to achieve desired flux, then fluid delivery efficiency is improved, but needle connector end disengagement occurs
Solution Approach 1:
The barb structure is pre-formed on the needle connector end to provide preliminary mechanical resistance against disengagement forces. This preemptive structural feature creates an opposing mechanical interlock that counteracts the disengagement tendency caused by high pressure fluid infusion, allowing efficient fluid delivery without connector failure.
3Reliability
If needle connector end is made to prevent disengagement under high pressure, then connector stability is improved, but the bonding process becomes more complex
Solution Approach 1:
The barb structure is pre-formed on the needle connector end before the bonding step, providing preliminary mechanical stability. This advance preparation of the mechanical interlock feature reduces the complexity of the bonding process, as the barb structure naturally guides alignment and provides inherent stability without requiring complex bonding procedures or additional components.
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
The solution effectively reduces the risk of needle disengagement, maintaining fluid communication and stability during high-pressure fluid infusion, as demonstrated by improved performance in simulation tests compared to traditional bonding methods.
Implementation Method 1
secured with a curable material that hardens upon exposure to UV radiation
Data Source
AI summary
A cannula-catheter bonding method and apparatus can include a needle having a specifically configured connector end to reduce the risk of the connector end disengaging with an adapter (e.g., a catheter, a cannula, or a connector of a Huber needle assembly, etc.). The specifically configured needle connector end can be a formation, such as a barb, a bead, an annular structure, a rib, etc. The formation can be formed on the connector end, and may be elongated with a conical shaped nose leading to a base with a bottom. The formation can be used to prevent movement of the needle relative to the adapter. A method for producing the formation can include forming a mold for the formation in a plate, where the connector end can then be placed within the mold so that curable material can be disposed within the mold. Upon hardening of the curable material, the formation can take the shape of at least a portion of the mold.