Negative Pressure Suction Sheath With Hand-Adjusted Pressure Control
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Solution Overview
Problem
Existing ureteral access sheaths face challenges in adjusting suction force according to intrapelvic pressure during surgeries due to the negative pressure device being out of reach, leading to calculi accumulation and blockage in the suction channel, affecting surgical efficiency.
Innovation Solution
A negative pressure suction sheath with a pressure regulating port on the main channel cavity, allowing adjustment of suction force through a hand-held mechanism, bypassing the suction channel, and featuring a flexible tip and multi-layer construction for enhanced maneuverability and suction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative pressure device is disposed on a wall of the operating room, then the device is stable and can provide continuous negative pressure, but the operator cannot reach the device to adjust the suction force during surgery
Solution Approach 1:
The system is divided into two functional parts: a remote negative pressure device that provides stable continuous pressure, and a local pressure regulating port on the sheath that allows hands-free adjustment. This segmentation resolves the contradiction by separating the functions of stability and adjustability to different locations.
Solution Approach 2:
A pressure regulating port with a regulating mechanism (valve or slider) is introduced as an intermediary between the operator and the negative pressure device. This intermediary allows the operator to adjust suction force during surgery without needing to reach the wall-mounted device, while the device itself remains undisturbed and stable.
2Device complexity
If the suction force is not adjusted according to intrapelvic pressure, then the negative pressure device remains stable and simple, but fragmented calculi accumulate in the suction channel causing blockage
Solution Approach 1:
The pressure regulating mechanism is designed to be easily accessible and operable by the surgeon during surgery, allowing real-time adjustment of suction force according to intrapelvic pressure conditions. This enables the system to self-adapt to changing surgical conditions, preventing calculi accumulation and blockage while maintaining operational simplicity.
3Ease of operation
If the pressure regulating port is disposed on the sheath near the suction channel, then the operator can easily adjust suction force, but fragmented calculi may enter the pressure regulating port causing blockage
Solution Approach 1:
The pressure regulating port is extracted from the suction channel path and placed on the outer surface of the sheath body. This spatial separation ensures that fragmented calculi flowing through the suction channel cannot enter the pressure regulating port, while the port remains easily accessible for operator adjustment during surgery.
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 precise control of suction force without operator distraction, preventing calculi blockage, and improving surgical efficiency by facilitating access to hard-to-reach areas like renal calyces.
Implementation Method 1
The sheath is connected to a negative pressure device through the negative pressure joint, so as to suck and discharge intraoperative fragmented calculi and fluids by a negative pressure
Implementation Method 2
a negative pressure in the sheath may be adjusted by adjusting an opening size of the pressure regulating port
Data Source
AI summary
A negative pressure suction sheath includes a sheath, a negative pressure joint, and a dilator; the negative pressure joint includes a main channel cavity and a negative pressure suction channel cavity located at one side of the main channel cavity, a proximal end of the sheath is connected to a distal end of the main channel cavity, the dilator is inserted from a proximal end of the main channel cavity and extends out of a distal end of the sheath, and is detachably connected to the main channel cavity; the main channel cavity is provided with a side channel port, the negative pressure suction channel cavity is communicated with the side channel port; a cavity wall of the main channel cavity is provided with a pressure regulating port. Therefore, an operator only needs to adjust the size of the pressure regulating port to adjust the negative pressure.