Kinked Hose Valve for Steep High-Pressure Injection Pulses
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Solution Overview
Problem
Existing devices fail to deliver a fluid under high pressure with a steep pressure rise while requiring minimal effort and having low sterilization and replacement costs, especially for needle-free injection systems.
Innovation Solution
The instrument incorporates a first fluid hose connected to a hose bending device, forming a valve by creating a loop that can be easily sterilized or replaced, allowing for high-pressure fluid delivery with a steep pressure rise, and a second fluid hose for medical fluid introduction after channel opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a flexible hose is arranged inside a pressure vessel to create a pinch valve, then the closing force required is reduced, but the steepness of the pressure rise when opening the valve is reduced
Solution Approach 1:
A resilient element (spring) is introduced as an intermediary to store and release energy rapidly. The spring is pre-compressed during valve closing and then releases this energy to rapidly open the valve, achieving steep pressure rise without requiring high closing forces from the drive mechanism.
Solution Approach 2:
The valve operation utilizes periodic compression and release of the resilient element. The spring is compressed during valve closing and then releases this stored energy in a rapid periodic action to open the valve, creating the necessary steep pressure rise flank.
2Reliability
If valves are designed to be sterilizable as a whole, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The valve system is segmented into two distinct parts: a sterile, disposable valve body made of flexible material, and a non-sterile, reusable actuating device. This segmentation allows the valve body to be easily sterilized or replaced, while the complex actuating mechanism remains outside the sterile field.
Solution Approach 2:
The flexible valve body is designed as a disposable component that can be easily sterilized or replaced after use. This eliminates the need to sterilize the entire valve assembly, reducing complexity and cost while maintaining reliability for sterile applications.
3Productivity
If high pressure fluid is delivered in pulses with steep pressure rise, then injection channel opening efficiency is improved, but the complexity of pressure control increases
Solution Approach 1:
The system uses the fluid pressure itself to operate the valve. The high-pressure fluid automatically opens the valve when needed, eliminating the need for complex external pressure control mechanisms. The resilient element and fluid pressure work together to create the pulsed delivery automatically.
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 efficient, low-effort delivery of high-pressure fluid pulses with a steep pressure rise for needle-free injections, minimizing sterilization and replacement costs, and ensuring effective fluid penetration into biological tissue.
Implementation Method 1
The hose bending device (8) has an actuating device (22) to kink off or release a loop (12) formed by the fluid hose (5) in a targeted manner
Implementation Method 2
a first fluid channel is provided in the instrument, via which a sharp jet of a fluid can be emitted, which is used to open an injection channel in the tissue
Data Source
Figure 1~2
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Figure 7~9
AI summary
According to the concept of the invention, a kinked hose valve is provided to generate a high-pressure pulse. This valve comprises a loop (12) provided in the supply hose (fluid hose (5)) of an instrument (2) and a hose kink device (8) designed as a reusable component. Such a valve has a very simple design and allows the generation of very steep pressure rise flanks at very high pressures up to 100 bar, as required for needleless injection. Sterilization requirements are minimal. Likewise, material costs are minimal when using disposable components.