Bladder Wall Cannula Placement Using Balloon Distension
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Solution Overview
Problem
Minimally invasive bladder surgery faces challenges in reliably placing a cannula without damaging adjacent organs due to the flaccid nature of the bladder wall, which lacks reactive resistance, and the risk of misalignment during blunt force dilation, leading to potential damage and procedural complications.
Innovation Solution
A method and apparatus that utilize a placement guide with a placement balloon to maintain bladder wall alignment and resistance, combined with an obturator with retractable blades for controlled penetration, allowing for controlled blunt force dilation and reduced risk of organ damage, facilitating the enlargement of the surgical pathway while minimizing the need for substantial pushing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If blunt force dilation is used to expand the surgical pathway through the bladder wall, then the enlarged opening is created for cannula insertion, but the flaccid bladder wall lacks reactive resistance causing misalignment and potential organ damage
Solution Approach 1:
The bladder wall is distended with fluid before the dilation procedure to create reactive resistance and stabilize the tissue, preventing misalignment during subsequent blunt force dilation
Solution Approach 2:
The placement balloon is inflated to apply counter-pressure against the obturator during penetration, maintaining control and preventing unintended deeper penetration into the bladder
2Force
If cutting surfaces or blades are attached to the trocar or obturator to facilitate penetration, then the force required to break through the abdominal wall is reduced, but the risk of unintended deeper penetration and organ damage increases
Solution Approach 1:
The abdominal wall is insuflated with gas or fluid before insertion to pre-expand the tissue and reduce the force needed for penetration, eliminating the need for cutting blades
Solution Approach 2:
The placement balloon acts as an intermediary that provides controlled resistance during obturator insertion, allowing penetration with reduced force while preventing unintended deeper penetration through its sealing and counter-pressure functions
3Stability of the object's composition
If the placement balloon is inflated to create a seal around the surgical pathway, then fluid distention is maintained for wall stability, but the balloon must be deflated to allow obturator removal
Solution Approach 1:
The placement balloon is inflated during the dilation and cannula insertion phases to maintain wall stability, then deflated in a periodic cycle to allow obturator removal while maintaining the surgical pathway opening
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 enhances control and reduces trauma during minimally invasive bladder surgery by maintaining bladder wall alignment and resistance, minimizing the risk of organ damage, and allowing for more precise placement of the cannula, thereby improving the reliability and efficiency of the surgical procedure.
Implementation Method 1
inflating a placement balloon on the forward end of the placement guide within the bladder... moving the inflated placement balloon into contact with the bladder wall adjacent to the small surgical pathway and creating a seal around the small surgical pathway
Implementation Method 2
distending the bladder wall with fluid introduced into the bladder while the placement balloon seals the small surgical pathway to hold the distention fluid within the bladder
Data Source
AI summary
A cannula is placed in an enlarged opening through a bladder wall and an abdominal wall by applying pulling tension to a placement guide extending through a small pathway to hold an inflated placement balloon in sealing contact with the bladder wall. The seal confines distension fluid in the bladder to establish sufficient reactive resistance to enlarge the opening through the bladder wall with blunt force dilation from an obturator.