Prostatic Capsule Catheter with Visual Probe and Segmented Bags
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Solution Overview
Problem
Current prostatic capsule expansion catheters face issues with blind positioning, complex structure, risk of rupture leading to bleeding, difficulty in maintaining pressure, painful water injection, inadequate drainage, and compression of the seminal colliculus during prostate surgery.
Innovation Solution
The design includes a catheter main body with separate high-pressure front and rear bag cavities, a miniature visual probe for direct visualization, and two holes at the catheterization cavity's front-end opening for improved drainage, along with a rear bag cavity that can be arched to reduce compression and prevent slippage, connected to pressure gauges and water injection catheters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a composite columnar high-pressure water bag is used for positioning, then the catheter can be positioned, but the positioning is blind and the structure becomes complicated
Solution Approach 1:
The patent divides the single columnar water bag into two separate barrel-shaped water bags (front bag cavity and rear bag cavity). This segmentation eliminates the need for nested structures, simplifies the overall design, and enables visual positioning through the rear bag cavity while maintaining positioning functionality.
Solution Approach 2:
The patent introduces a miniature visual probe as an intermediary device that enables direct visualization of the positioning process. This mediator allows the surgeon to see the position of the water bags and seminal colliculus in real-time, transforming blind positioning into visual positioning without requiring complex nested bag structures.
2Reliability
If a composite columnar high-pressure water bag is used, then positioning is achieved, but the risk of rupture and bleeding increases
Solution Approach 1:
By dividing the single high-pressure bag into two separate barrel-shaped bags, the patent distributes the pressure load and reduces the risk of catastrophic failure. If one bag ruptures, the other can still maintain positioning, thereby reducing bleeding risk and improving reliability.
Solution Approach 2:
The patent uses flexible rubber or silicone material for the water bags that can withstand high pressure (≥0.48 MPa) while maintaining flexibility. This material choice ensures the bags can be inflated to necessary pressures for positioning and expansion without rupturing, reducing bleeding risk.
3Ease of operation
If water injection is used to fasten the catheter, then the catheter is secured, but the patient experiences pain
Solution Approach 1:
The patent separates the catheter fixation function from the expansion function by using the front barrel-shaped water bag specifically for fixation and the rear bag for expansion. This segmentation allows gentle water injection for securing the catheter without the high pressures needed for expansion, thereby reducing patient pain.
Solution Approach 2:
The front bag cavity is specifically designed for fixation with smaller water injection volumes, while the rear bag cavity handles expansion with larger volumes. This local differentiation of function allows painless fixation through controlled, small-volume water injection without requiring high pressure.
4Device complexity
If a single front-end side hole is provided in the catheterization cavity, then the structure is simple, but drainage is inadequate and easily blocked
Solution Approach 1:
The patent divides the single front-end opening into two separate holes in the catheterization cavity. This segmentation of the drainage opening doubles the drainage capacity and prevents clogging by distributing flow through multiple channels, while adding minimal structural complexity.
5Productivity
If regular decompression is performed after operation, then the water bags can be deflated, but the process is tedious
Solution Approach 1:
The patent uses two-way or three-way switches that control both water injection and decompression functions. This multi-functionality allows the same device to perform both filling and emptying operations, simplifying the decompression process and reducing the time required for postoperative procedures.
6Strength
If a columnar water bag is used for expansion, then expansion is achieved, but the seminal colliculus is compressed and injured
Solution Approach 1:
The patent changes the shape from columnar to barrel-shaped with a curved surface. This curvature allows the water bags to conform to the anatomical contours of the prostate and avoid direct compression of the seminal colliculus, while still providing sufficient expansion force for the procedure.
Solution Approach 2:
The rear bag cavity is specifically designed with a curved surface to straddle and protect the seminal colliculus during expansion. This local adaptation of the bag shape ensures that high expansion pressures are applied to the prostatic capsule while the seminal colliculus area is spared from direct compression.
Data Source
AI summary
An inspection positioning prostatic capsule expansion catheter includes a catheter main body. The catheter main body is internally provided with a catheterization cavity, a rinse cavity, a front bag cavity, and a rear bag cavity. The four cavities are each provided with a front-end opening. At the rear of the front-end openings of the catheterization cavity and the rinse cavity is the front bag cavity. At the rear of the front bag cavity is the rear bag cavity arranged in parallel. The catheter main body at the tail of the rear bag cavity is provided with a miniature visual probe. The miniature visual probe is mounted on a semi-circular protrusion at the tail of the rear bag cavity.