Medical Pump Throttle Channel for Precise Contamination-Free Flow
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Solution Overview
Problem
Existing medical pump devices face challenges in accurately adjusting the flow rate of medical fluids due to material removal machining, which can introduce contaminants and pose health risks, and are prone to tolerance-related issues affecting delivery pressure and flow rate.
Innovation Solution
The throttle device features movable surfaces forming a channel with a variable effective length, allowing for fine adjustment of the flow rate without material removal, using a helical design and profiling to enhance adaptability and prevent blockages, and ensuring a fluid-tight interference fit to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If material removal machining is used to adjust the channel for fine flow rate adjustment, then the flow rate can be precisely adjusted, but particles of material are generated that may contaminate the pump device and pose health risks
Solution Approach 1:
The channel is designed with movable surfaces that can be positioned at different locations, allowing the effective length of the channel to be variable. This dynamic adjustment mechanism enables flow rate fine-tuning without material removal, thus avoiding particle generation and contamination risks while maintaining manufacturing precision.
Solution Approach 2:
The invention changes the parameter of channel length dynamically by moving surfaces relative to each other. This allows the effective length of the channel to be adjusted to achieve the desired flow rate without removing material, thereby eliminating the harmful effect of particle generation while preserving manufacturing precision.
2Manufacturing precision
If material removal machining is used to adjust the channel, then the flow rate can be adjusted, but the process is complex and requires careful removal of particles after adjustment
Solution Approach 1:
Instead of irreversible material removal, the invention employs movable surfaces that can be dynamically positioned to adjust the channel's effective length. This simplifies the adjustment process by eliminating the need for complex particle removal procedures while maintaining manufacturing precision for flow rate control.
3Productivity
If the channel has a small effective diameter to act as flow resistance, then the flow rate can be controlled, but fluid-dynamic interface phenomena may occur causing delayed onset or premature blockage
Solution Approach 1:
The invention uses movable surfaces to dynamically adjust the channel's effective length, providing flow rate control through length variation rather than relying solely on small diameter. This approach maintains delivery reliability by avoiding the fluid-dynamic interface phenomena that occur in narrow channels, while still achieving the desired flow resistance and control.
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
This solution allows for precise adjustment of the flow rate at manufacture without generating waste material, reducing the risk of contamination and ensuring consistent delivery of medical fluids, while avoiding fluid-dynamic interface issues and blockages.
Implementation Method 1
the elastomeric membrane is elastically expanded in a filling state of the pump volume at least partially filled with the medical fluid, and wherein, by means of the elastically expanded membrane, a delivery pressure is exerted on the pump volume
Implementation Method 2
the surfaces are movable relative to each other for the fine adjustment of the flow rate at the time of manufacture, in such a way that an effective length of the channel is variable
Data Source
AI summary
A pump device for conveying a medical fluid, the pump device includes a membrane forming a pump volume. The membrane is expanded in a filling state of the pump volume with the medical fluid. The expanded membrane exerts a delivery pressure on the pump volume to deliver the medical fluid into a fluid-line system. The pump device also has a throttle device with a channel having an inlet connected to the pump volume and an outlet connectable to the fluid-line system. The delivery of the medical fluid through the outlet is finely adjustable to a flow rate at a time of manufacture. The throttle device has two bodies. The channel is formed between oppositely arranged surfaces of the bodies. The oppositely arranged surfaces are movable relative to each other for the fine adjustment of the flow rate during the manufacture, so that an effective length of the channel is variable.