Guidewire Catheter Assembly for Reduced Insertion Deflection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Long inner needles and catheters are difficult to puncture and insert into blood vessels due to deflection and challenges with meandering and branching vessels.
Innovation Solution
A catheter assembly with a guide wire and movable components that facilitate easy puncturing and insertion, including a catheter, inner needle, guide wire, and movable wire operating member, allowing for controlled movement and alignment of the needle and catheter.
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 vessel positions, but the catheter becomes difficult to puncture and insert due to deflection
Solution Approach 1:
A guide wire is introduced as an intermediary component to facilitate catheter insertion. The guide wire is inserted into the blood vessel first, then the long catheter is advanced over the guide wire, which provides a stable track that prevents deflection and enables successful placement of long catheters in central intravenous applications
2Length of moving object
If the catheter length is increased to navigate meandering and branching blood vessels, then the catheter can reach target positions in complex vessel structures, but insertion becomes more difficult due to deflection
Solution Approach 1:
The guide wire serves as a mediator that conforms to the natural anatomy of meandering and branching blood vessels. By following the vessel path and providing a pre-established track, the guide wire enables the long catheter to navigate complex vessel structures without deflection, improving adaptability to various vascular anatomies
3Length of moving object
If a long inner needle and catheter are used for central intravenous catheterization, then the catheter can be indwelled in distant blood vessels, but the puncturing operation becomes difficult due to deflection
Solution Approach 1:
The guide wire acts as a reliable intermediary that stabilizes the puncturing operation. By inserting the guide wire first to establish a secure path, subsequent advancement of the long inner needle and catheter becomes more reliable and less prone to deflection, even in central intravenous catheterization
Solution Approach 2:
The guide wire is inserted into the blood vessel before the inner needle and catheter are advanced. This preliminary action creates a stable track that prevents deflection during the subsequent puncturing and insertion operations, improving reliability of the overall procedure
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.