Passive Valve Diaphragm for Medical Suction Pressure Control
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Solution Overview
Problem
Existing fluid control devices for medical suction, such as those used in medical suction devices, have complex structures and high manufacturing costs due to the need for sensors, solenoid valves, and control devices to manage excess negative pressure.
Innovation Solution
A fluid control device with a simple structure that includes a container, a pressure resistance portion, and a passive valve, which automatically adjusts communication states between ventilation holes based on pressure differences to release excess negative pressure without the need for sensors or solenoid valves, using a diaphragm and ventilation holes to manage airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors, solenoid valves, and control devices are used to manage excess negative pressure, then the fluid control device can effectively release excess negative pressure, but the structure becomes complicated and manufacturing cost increases
Solution Approach 1:
The passive valve automatically opens and closes based on pressure differential without requiring external control systems. When negative pressure exceeds a certain threshold, the pressure differential causes the valve to open automatically, allowing air to enter and equalize the pressure. This self-regulating mechanism eliminates the need for sensors, solenoid valves, and control devices while maintaining effective pressure management.
Solution Approach 2:
The patent replaces the electronic control system (sensors, solenoid valves, control devices) with a purely mechanical passive valve mechanism. The valve uses pressure differential forces to automatically control air flow, substituting complex electronic mechanics with simple mechanical pressure-responsive operation.
2Reliability
If sensors, solenoid valves, and control devices are used to manage excess negative pressure, then the fluid control device can effectively release excess negative pressure, but manufacturing cost increases
Solution Approach 1:
The passive valve automatically opens and closes based on pressure differential without requiring external control systems. When negative pressure exceeds a certain threshold, the pressure differential causes the valve to open automatically, allowing air to enter and equalize the pressure. This self-regulating mechanism eliminates the need for sensors, solenoid valves, and control devices while maintaining effective pressure management.
Solution Approach 2:
The passive valve is designed as a simple, inexpensive mechanical component that can be easily manufactured and potentially replaced. By using basic mechanical elements rather than expensive electronic components, the overall manufacturing cost of the fluid control device is significantly reduced.
3Device complexity
If a passive valve with diaphragm and ventilation holes is used instead of sensors and solenoid valves, then manufacturing cost is reduced and structure is simplified, but the ability to precisely control pressure may be affected
Solution Approach 1:
The passive valve is designed with specific structural parameters (diaphragm area, ventilation hole size, spring constant) that determine the pressure threshold at which the valve opens. By carefully selecting these parameters, the valve provides sufficient pressure control precision for medical applications without requiring complex electronic sensing and control systems.
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
The device effectively releases excess negative pressure and reduces manufacturing costs by eliminating the need for sensors and solenoid valves, while maintaining efficient fluid management and preventing dust and dirt from entering the patient's body.
Implementation Method 1
The pressure resistance portion is provided between the storage chamber and the suction hole and generates a difference between an air pressure in the storage chamber and an air pressure in the suction hole
Implementation Method 2
The diaphragm having this configuration passively switches a communication state between the first ventilation hole and the second ventilation hole based on a pressure in the first region and a pressure in the second region
Data Source
AI summary
A fluid control device includes a container and a passive valve. A vacuum source has a suction hole. The container has a first connection hole, a second connection hole, a third connection hole, a storage chamber, and a water-sealing chamber. The passive valve includes a first valve housing, a second valve housing, and a diaphragm. A ventilation hole, a second ventilation hole, and a third ventilation hole are provided in the first valve housing and the second valve housing. The first ventilation hole of the passive valve communicates with the second connection hole of the container. The second ventilation hole of the passive valve communicates with the suction hole of the vacuum source. The third ventilation hole is opened to the atmosphere. The diaphragm is pinched between the first valve housing and the second valve housing and forms a first region and a second region.