Catheter Hub Collet Locking Mechanism for Reverse Tunneling
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Solution Overview
Problem
Existing multi-lumen catheters face challenges in maintaining a secure and leak-proof connection after reverse tunneling, particularly in preventing unintentional disconnection and fluid leakage during medical procedures.
Innovation Solution
A connection system featuring a hub assembly with a collet and collar configuration, including barbed or ridged surfaces, provides an irreversible locking mechanism that enhances mechanical fixation and sealing, while a multifunction adaptor with a C-clip, valve, and retention ring facilitates secure attachment and fluid management during catheter placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection system is attachable following reverse tunneling procedure, then the catheter can be accurately positioned within the blood vessel and subcutaneous tunnel, but the connection may be unintentionally disconnected
Solution Approach 1:
The connection system is divided into separate components (catheter shaft, hub assembly, collar, collet) that can be assembled after tunneling. The collet is inserted through the catheter lumen and secured with a collar, creating a modular connection that is both reliable and adaptable to reverse tunneling placement requirements.
Solution Approach 2:
The collet is inserted through the lumen of the catheter shaft and positioned within the hub assembly, creating a nested structure. The collar then engages with the collet to secure the connection, with the catheter wall passing between the collet and cannula. This nested arrangement ensures reliable connection while accommodating the post-tunneling attachment requirement.
2Reliability
If a connection system provides irreversible connection, then unintentional disconnection is prevented, but the connection cannot be adjusted or removed if needed
Solution Approach 1:
The collet is inserted through the catheter lumen and positioned within the hub assembly before final securing. This preliminary positioning allows for adjustment and verification of the connection before the collar is fully engaged, providing adaptability while maintaining eventual irreversibility for safety.
Solution Approach 2:
The connection system transitions from a dynamic state during assembly (where the collet can be positioned and adjusted within the hub assembly) to a static locked state when the collar engages with the collet. This dynamic assembly process allows for adjustment, while the final state provides irreversible security.
3Reliability
If a connection system provides fluid tight connection, then leaking is prevented, but the connection structure becomes more complex
Solution Approach 1:
The collet is nested within the hub assembly with the catheter wall passing between the collet and cannula. This nested configuration naturally creates fluid tight seals at the interfaces without requiring additional sealing components, maintaining simplicity while ensuring fluid integrity.
Solution Approach 2:
The catheter wall itself acts as a flexible barrier that passes between the collet and cannula, creating a fluid tight seal. This use of the catheter's own structure as the sealing element avoids adding complex sealing mechanisms while ensuring leak prevention.
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 connection system ensures a secure, irreversible attachment of the catheter to the hub assembly, preventing accidental disconnection and fluid leakage, thereby ensuring reliable and safe medical device operation.
Implementation Method 1
the barbed or ridged surface presses into the catheter shaft, causing material creep to take place into the voids between adjacent barbs or ridges
Data Source
AI summary
A catheter connection system and a method of connecting the catheter connection system to a catheter. The catheter connection system includes a hub assembly and a collar. The hub assembly includes a cannula extending from a distal end thereof, and a collet defining an inner surface spaced apart from the cannula to permit passage of a catheter wall between the body and the cannula.