Urinary Catheter Pilot Balloon Placement Verification
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Solution Overview
Problem
Urinary catheters often cause complications due to improper placement, balloon inflation within the urethra, balloon burst, and failure to deflate, leading to injuries, infections, and increased medical intervention.
Innovation Solution
A urinary catheter design featuring a retention balloon and a pilot balloon with different inflation pressures, where the pilot balloon inflates only when the retention balloon is incorrectly positioned, alerting users to incorrect placement, and a method for manufacturing and using the catheter to prevent such complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single balloon is used in the catheter, then the device structure is simple, but it cannot provide reliable indication of correct placement and may lead to urethral injury
Solution Approach 1:
The single balloon is divided into two separate balloons: a retention balloon at the distal end for bladder anchoring and a pilot balloon at the proximal end for placement verification. This segmentation allows each balloon to perform its specific function independently, providing reliable placement indication while maintaining structural simplicity.
Solution Approach 2:
The pilot balloon acts as an intermediary indicator between the retention balloon and the user. It provides visual feedback about the inflation status and placement correctness of the retention balloon, enabling users to verify proper placement without direct observation of the distal balloon.
2Ease of operation
If the balloon inflates at low pressure, then it is easy to inflate, but it may inflate incorrectly in the urethra causing injury
Solution Approach 1:
The two balloons are designed with different local qualities: the retention balloon has larger volume and lower inflation pressure for comfortable bladder anchoring, while the pilot balloon has smaller volume and higher inflation pressure for reliable placement verification. This local differentiation ensures each balloon operates in its optimal pressure range for its specific function.
Solution Approach 2:
The pilot balloon is positioned to inflate first at higher pressure, creating a preliminary indication of correct placement before the retention balloon inflates. This preliminary action prevents incorrect inflation of the retention balloon in the urethra by providing advance verification of proper positioning.
3Strength
If the balloon material is highly elastic, then it can expand to large diameter for retention, but it may burst under over-inflation
Solution Approach 1:
The pilot balloon is designed to inflate with a smaller volume of fluid (5-10 mL) compared to the retention balloon (30-50 mL). This partial action provides sufficient placement indication while reducing the risk of over-inflation and burst, as the pilot balloon reaches its functional expansion limit before the retention balloon does.
Solution Approach 2:
The pilot balloon serves as a cushioning indicator that alerts users to stop inflation before the retention balloon reaches dangerous pressure levels. By providing visual feedback at lower inflation volumes, it prevents excessive inflation that could lead to burst.
4Reliability
If the catheter requires multiple verification steps for placement, then placement accuracy improves, but the procedure time increases
Solution Approach 1:
The pilot balloon provides immediate visual feedback about placement correctness through its inflation status. When the pilot balloon inflates properly, it directly indicates that the retention balloon is correctly positioned in the bladder, eliminating the need for multiple verification steps or invasive follow-up procedures.
Solution Approach 2:
The catheter system performs self-verification through the pilot balloon's automatic inflation response to placement conditions. The system monitors its own placement status and provides self-diagnosis, eliminating the need for external verification tools or multiple manual checking steps by the operator.
Data Source
AI summary
A urinary catheter may include a catheter shaft and a connector coupled with the proximal end of the catheter shaft. The connector may have a first arm ending in a fluid outlet configured to allow urine to flow out of the urinary catheter and a second arm with an aperture and ending in an inflation inlet used for introducing inflation fluid into the urinary catheter. The catheter may further include a primary lumen, an inflation lumen, a retention balloon mounted to the catheter shaft proximal to a fluid inlet and over a distal filling hole, and a pilot balloon mounted on the second arm of the connector over the aperture. The pilot balloon inflates at an inflation pressure that is higher than the inflation pressure of the retention balloon and lower than a predetermined pressure threshold.