Rotatable Guide Tube for Precise Cannula Puncture
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Solution Overview
Problem
Conventional medical instruments for inserting cannulas into bodily passages face challenges such as limited angular penetration, imprecise puncture site establishment, and complexity in manipulating multiple guide channels, leading to painful procedures and difficulty in achieving precise angular distributions for punctures.
Innovation Solution
A medical instrument featuring a guide tube with a single axial guide channel that deflects laterally at the distal end, allowing flexible cannula insertion and rotation for precise angular control, facilitated by a rotatable handle piece and marker system, enabling easy and reliable penetration at various angles without increasing the instrument's diameter or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple axially parallel guide channels are provided in the guide tube to enable punctures at various angular positions, then the number of punctures and their angular distribution can be predetermined, but the device complexity increases and the guide tube diameter must be large
Solution Approach 1:
The guide tube is made rotatable relative to the handle piece, transforming the static multiple-guide-channels design into a dynamic single-channel system. The single guide channel remains axially aligned, but the entire guide tube can be rotated to different angular positions around the longitudinal axis, allowing the single puncture site to be positioned at various angles without requiring multiple fixed channels.
Solution Approach 2:
The single guide channel serves multiple functions by combining the roles that would otherwise require multiple separate channels. Through rotation, the same guide channel can be positioned to create punctures at different angular locations, making the system universal for various puncture patterns without increasing structural complexity.
2Productivity
If the guide tube has multiple guide channels for different angular positions, then multiple punctures can be made without rotating the instrument, but the guide tube must have a large diameter
Solution Approach 1:
The rotatable guide tube allows a single narrow channel to access multiple angular positions dynamically during the procedure. Instead of requiring all puncture sites to be accessible simultaneously through multiple parallel channels (which would require large diameter), the system uses temporal sequencing through rotation, maintaining a small guide tube diameter while achieving the same productivity.
3Ease of operation
If the cannula is inserted at a small angle to the axis of the bodily passage, then the lumen constraints are respected, but the penetration into the wall is flat and imprecise
Solution Approach 1:
The guide channel is bent continuously along its length rather than having sharp angles or discrete segments. This continuous curvature allows the cannula to follow a smooth path from the axial insertion direction through the guide tube into the lateral emergence direction, maintaining continuous contact and control throughout the deflection, thereby achieving precise puncture sites while respecting lumen constraints.
4Reliability
If the injection cannula is advanced through a great distance through tissue to reach the inner opening of the uterus, then anesthetic can be delivered, but the procedure is painful and blood vessels are present
Solution Approach 1:
The guide tube is inserted first to establish a safe pathway through the tissue to the target location near the inner opening of the uterus. The cannula is then advanced through the pre-established guide channel, which has already negotiated the complex tissue path. This preliminary action by the guide tube eliminates the need for the cannula to independently traverse the dangerous path, reducing pain and avoiding blood vessels that would otherwise be encountered during direct cannula insertion.
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 provides a flexible and easy-to-manipulate medical instrument that allows for precise and pain-reduced cannula insertion with flexible angular options, improving the accuracy and ease of medical procedures like intrauterine coil insertion and biopsy sampling.
Implementation Method 1
an inner axial guide channel which leads to a lateral opening at the periphery of the guide tube behind the closed distal end of the guide tube, so that an elastically flexible cannula may be proximally inserted into the guide channel and when advanced in the guide channel emerges laterally at its distal tip through the opening at an angle to the axis of the guide tube
Data Source
AI summary
A medical instrument comprises a guide tube (10) that can be inserted into a bodily passage of a patient. An elastically flexible cannula may be displaced within an inner axial guide channel of the guide tube (10), the distal tip (52) of the cannula being able to emerge from a lateral opening at the periphery of the guide tube (10) at an angle to the axis of the guide tube (10). The guide tube (10) at its proximal end is accommodated in a handle piece (22) so as to be rotatable about the longitudinal axis of the guide tube.