Related Experiment Video
Updated: Jun 6, 2026
07:12
Design of a Cyclic Pressure Bioreactor for the Ex Vivo Study of Aortic Heart Valves
Published on: August 23, 2011
Proportional mechanical ventilation through PWM driven on/off solenoid valve.
I Sardellitti1, S Cecchini, S Silvestri
1Dept. of Advanced Robotics, Italian Institute of Technology, Genoa, Italy. irene.sardellitti@iit.it
Summary
This study introduces a novel system using on-off solenoid valves for proportional ventilation, offering a cost-effective and compact alternative to traditional methods. This innovation enables precise control for high-frequency ventilation, paving the way for portable devices.
Area of Science:
- Biomedical Engineering
- Respiratory Care Technology
- Mechanical Ventilation
Background:
- Current proportional ventilation systems primarily utilize proportional valves.
- On-off solenoid valves offer advantages in size, cost, and switching speed, making them suitable for high-frequency ventilation.
Purpose of the Study:
- To develop and evaluate a novel system for proportional ventilation using on-off solenoid valves.
- To demonstrate the feasibility of achieving precise flow rate control for advanced ventilatory support.
Main Methods:
- A new system integrating a fast-switching driver circuit with on-off solenoid valves was designed.
- Pulse Width Modulation (PWM) control was implemented to reduce valve response time.
- Experimental trials were conducted to assess dynamic response and flow rate pattern generation.
Main Results:
- The PWM-driven on-off valve system demonstrated smooth tracking of reference flow rate patterns, even with rapid changes (20 ms intervals).
- Achieved flow rate resolution of up to 1 L/min and repeatability of approximately 0.5 L/min.
- Verified the system's effectiveness in generating variable ventilatory flow rate patterns.
Conclusions:
- On-off solenoid valves, when driven by a novel PWM circuit, can effectively implement proportional ventilation.
- This technology presents a feasible pathway for developing standalone, portable devices capable of both proportional and high-frequency ventilation.
Related Concept Videos
01:14Ventilatory Modes
Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
01:23Mechanical Ventilation II: Invasive Ventilation
Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
01:29Mechanical Ventilation I: Indication and Settings
Mechanical ventilation is a life-saving technique for managing acute respiratory failure and other respiratory complications. The process involves using a machine known as a ventilator to supply oxygen to the lungs and assist in removing carbon dioxide. It serves as a bridge to long-term mechanical ventilation or a temporary measure until ventilatory support is discontinued. The ventilator can maintain this function for a prolonged period, providing critical support for patients until they can...
01:23Mechanical Ventilation III: Noninvasive Ventilation
Noninvasive positive-pressure ventilation (NIPPV), continuous positive airway pressure (CPAP), and bilevel positive airway pressure (BiPAP) are essential methods in respiratory care. These ventilation techniques offer unique benefits for patients with various respiratory conditions, providing adequate support without requiring intubation. Let's explore how each method is crucial in improving patient outcomes and enhancing respiratory therapy.
Noninvasive Positive-Pressure Ventilation (NIPPV)
Noninvasive Positive-Pressure Ventilation (NIPPV)
01:17Solenoids
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field for a solenoid is the vector sum of the magnetic field due to its individual turns. For an ideal solenoid, the magnetic field inside is almost uniform and parallel to the solenoid axis, while the magnetic field outside the solenoid is nearly zero.
Each turn in a solenoid can be approximated as a circular current carrying coil that generates a dipole moment. The...
Each turn in a solenoid can be approximated as a circular current carrying coil that generates a dipole moment. The...
01:24Pulmonary Ventilation: Inhalation
Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...
Boyle's law becomes particularly pertinent when examining respiratory...