The roots of positive airways mechanical ventilation can be traced to WWII with the needs for pilots to breath at higher altitudes. Ventilation therapy then made accelerated progresses during the polio epidemic in the 50’s.
Today, mechanical ventilation is indicated when a patient’s spontaneous ventila tion is inadequate to maintain life. It is also indicated as p revention for imminent collapse of other physiologic functions, or ineffective gas exchange in the lungs. Mechanical ventilation in hospitals and in the field have contributed to dramatically improve the life expectancy of patients during and after surgeries, or suffering from accidental disrupted lungs function or finally of patients suffering from acute chronic pulmonary diseases. More recently home care applications previously considered as comfort – improving therap ies are showing premier medical interest in the race to extend people’s life. For instance, lower end mechanical ventilators devices known as CPAP and used at night to treat sleep apnea, a disorder once considered a simple discomfort and which is now recognized as a source of major medical complications (increased blood pressure, diabetes,… ); are increasingly popular and effective.
Medical ventilation technology has been evolving from stationary units originally relying on oxygen and compressed air drawn from the hospital supply lines into autonomous portable devices, capable of providing their own controlled pressure and flow. This migration was accelerated with the increased need to allow patients to recover in the comfort of their own home after a pulmonary surgery when affected from acute Obstructive Sleep Apnoea (OSA) syndrome or even from more severe conditions such as acute respiratory failure or Chronic Obstructive Pulmonary Diseases (COPD), a growing leading cause of death globally.
Consequently former valves or piston driven solutions progressi vely gave way to high – speed micro – turbine blower driven ventilators, which can now be distinguished in 4 major categories: intensive care, home care, transport ventilators and neonatal ventilators.
MINIATURE MOTORS FOR HIGH EFFICIENCY BLOWER SYSTEMS
High efficiency blower systems which include a specific motor and a fan have been designed in such a way that inspiration pressure (IPAP) and expiration (EPAP) pressure can be generated and controlled by acting on the motor speed only. (See Figure )
By ramping up and down motor speed from 15,000 to 60,000 rpm in a matter of 100 – 120 milliseconds, the newest ventilators are capable of ventilating modes very close to a patient ’s natural breathing pattern, hence maximizing their therapy acceptance, and are also capabl e of invasive ventilation, once not possible with turbine blower designs. Pressure of 100 CmH2O and flow in excess of 200L/min are now common requirements which ETONM brushless – motor – equipped blowers can reliably support. Indeed, brushless technology offers the longer life span at such speed. Collaborative work with ball bearing manufacturers warrant the best solution for each application requirement (speed, load, oxygen content, noise level,..).
Because of the increased demand in ambulatory ventilati on solutions mentioned above, longer battery life, and thus the need for a higher efficiency motor, is critical.
How to choose ETONM gearmotor for ventilator?