Catheter Infusion Needle Right-Angle Projection Guide
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Solution Overview
Problem
Existing medical devices with infusion needles in catheters struggle to accurately position the distal portion of the infusion needle at a right angle relative to the catheter's axial direction, leading to inconsistent drug solution infusion, especially in sensitive areas like the brain region, where precise administration is critical and tissue damage must be minimized.
Innovation Solution
A medical device featuring a catheter with a bendable infusion needle connected via a bendable connecting part, utilizing inflatable-and-contractible members or guide members with moving means to bend the needle at a right angle relative to the catheter, ensuring precise alignment and accurate drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the infusion needle is guided by a curved-surface guide part inclined relative to the catheter axial direction, then the needle can be projected to the lateral side of the catheter, but the distal portion of the infusion needle becomes inclined instead of being set at a right angle with respect to the axial direction
Solution Approach 1:
The guide member is divided into a guide body and a separate guide tip. The guide body is integrated into the catheter structure while the guide tip can be independently positioned and adjusted. This segmentation allows the guide tip to be precisely oriented at a right angle to the catheter axis, ensuring accurate needle projection without compromising the overall ease of operation.
Solution Approach 2:
The guide tip is designed to be movable relative to the guide body, allowing dynamic adjustment of the guide tip's position and orientation. This dynamic capability enables the guide tip to be positioned precisely at a right angle to the catheter axis during needle projection, while the guide body remains integrated into the catheter structure for ease of operation.
2Ease of operation
If the distal portion of the infusion needle is projected at an inclined angle, then the needle can be guided through the catheter opening, but the position of the distal portion varies in axial and radial directions according to the amount of movement of the drug solution infusion tubing
Solution Approach 1:
The guide tip serves as an intermediary element between the infusion needle and the catheter opening. It provides a stable, right-angle reference point that mediates the transition from the inclined needle path to the vertical projection through the catheter opening. This intermediary structure ensures consistent needle position regardless of infusion tubing movement.
Solution Approach 2:
The guide tip changes the angular parameter of the needle projection from an inclined angle to a precise right angle relative to the catheter axis. This parameter transformation ensures that the distal portion of the infusion needle maintains a consistent position during projection, eliminating position variation caused by infusion tubing movement.
3Manufacturing precision
If the distal portion of the infusion needle is projected at a right angle to the catheter axial direction, then accurate drug solution infusion can be achieved, but the structure becomes more complex requiring bending means
Solution Approach 1:
The guide tip is pre-formed and pre-positioned at a right angle to the catheter axis before needle projection. This preliminary preparation eliminates the need for complex real-time bending mechanisms during operation. The pre-configured guide tip simply guides the needle into the correct position, reducing device complexity while maintaining projection accuracy.
Solution Approach 2:
The guide tip acts as a simple intermediary structure that mediates between the catheter and the infusion needle. It provides a straightforward right-angle reference without requiring complex bending mechanisms. This intermediary approach achieves accurate needle projection through a simple, elegant structure rather than through complexity.
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
Enables accurate and controlled infusion of drugs or therapeutic substances into specific tissue regions by ensuring the infusion needle is projected at a right angle, facilitating precise administration while minimizing tissue damage during medical treatments, particularly in the brain region.
Implementation Method 1
a first inflatable-and-contractible member which in a contracted state is disposed inside the catheter so as to face the opening with the infusion needle between the opening and the inflatable-and-contractible member. When the inflatable-and-contractible member is inflated, the inflatable-and-contractible member contacts the infusion needle to push the infusion needle toward the opening, thereby bending the infusion needle.
Data Source
AI summary
A medical device includes a catheter having an opening formed in a side portion of the catheter, an infusion tubing extending within the catheter along an axial direction of the catheter; an infusion needle disposed at a distal portion of the infusion tubing, a connecting part which bendably connects the infusion needle to the distal portion of the infusion tubing, and a bending unit by which the infusion needle located inside the catheter so as to face the opening is bent at the connecting part at essentially a right angle with respect to the distal portion of the infusion tubing.