Guide Wire Catheter Assembly for Long-Catheter Vessel Insertion
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Solution Overview
Problem
Long inner needles and catheters in catheter assemblies make puncturing and insertion into blood vessels difficult, especially in vessels with meandering or branching paths.
Innovation Solution
A catheter assembly with a guide wire that is longer than the inner needle and catheter, allowing for easier puncturing and insertion by using a wire operating member to advance the guide wire and catheter along the blood vessel, and a pressing member to prevent deflection during puncturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lengths of the inner needle and catheter are increased to enable central intravenous catheterization, then the catheter can reach distant blood vessels, but puncturing becomes difficult due to deflection
Solution Approach 1:
A guide wire is introduced as an intermediary tool to facilitate catheter insertion. The guide wire is first inserted into the blood vessel through the inner needle, providing a stable trajectory. The catheter is then advanced over the guide wire, using it as a rail to prevent deflection during insertion, thus enabling successful central intravenous catheterization despite the catheter's length
2Length of moving object
If the lengths of the inner needle and catheter are increased to enable central intravenous catheterization, then the catheter can reach distant blood vessels, but insertion into meandering and branching blood vessels becomes difficult
Solution Approach 1:
The guide wire serves as a mediator that adapts to the blood vessel's anatomy. Its flexible nature allows it to follow meandering and branching paths, while the catheter, constrained by the guide wire, can be accurately guided into the target vessel without excessive deflection or difficulty
Solution Approach 2:
The guide wire is inserted into the blood vessel before the catheter is advanced. This preliminary action establishes a stable pathway and trajectory, allowing the catheter to be subsequently inserted along the pre-defined path, thereby simplifying insertion into complex vascular structures
Data Source
AI summary
A catheter assembly includes a catheter, a catheter hub fixed to the proximal end portion of the catheter, a hollow inner needle removably located in the catheter and including a distal end portion at which is located a needlepoint to puncture skin of a patient, and a guide wire slidably positioned in the inner needle. The guide wire is longer than both the inner needle and the catheter. A wire operating member is connected to the guide wire and is displaceable in the forward direction relative to the inner needle and the catheter. A main body is detachably connected to the catheter hub and includes a finger-engaging projection at a distal portion of the main body that is engageable by a user's finger to advance the main body and the catheter in the forward direction.