arificial respirator

When it comes to safety requirements, as everyone certainly recognizes, the level of requirements towards the field of medical equipment is extremely high. Heaters are necessary for medical equipment such as artificial respirators, which are used for patients whose life support situation is precarious, such as when they cannot breathe well or at all on their own.

During normal breathing, the air that you breathe passes through the upper respiratory tract and is warmed by the respiratory mucosa before flowing to the body’s organs. However, in the case of gas inhaled from an artificial respirator, it remains as dry gas which can cause damage to the epithelial cells in the trachea and bronchial tubes, not to mention impair their fimbric movement, which may cause atelectasis or increase the risk of infection. The inhaled gas within the body changes with even minor fluctuations in temperature, humidity, and absolute humidity. This is why controlling the temperature and humidity of inhaled gas in an artificial respirator is of critical importance.

We received a request in which the customer said they could not immerse a heater directly into a water tank for sanitary reasons, so they needed a way to indirectly heat the outside of the tank.

At the hospital, heaters are periodically removed, so the ease of maintenance for the heater was important. Kawai Corporation proposed the installation of a silicone rubber heater around the outside of the tank, as the area of the tank was small. The temperature fuse and thermocouple would both serve to control the temperature for safety purposes, and heater and insulator were to be combined to ensure adhesion as well as to allow for easy installation and removal. These methods made it possible to reduce the burden on workers.

Despite this, when considering the heater installation area and the necessary wattage, as the watt density would be high, we made frequent and detailed inquiries on how the heater would be used. It was necessary to make detailed decisions to place limits on the number of hours the heater should be used at maximum temperature.

We are planning to hold product lifespan tests to check the condition of the internal heating element.

In the past, we decided that some cases like this would be impossible in light of product safety and lifespan… but in this case, we put our heads together with the customer and created rules on how the product would be used, to realize new possibilities. Control through establishing rules is not as thorough as we would like yet, so we want to continue to make proposal to our clients from this perspective.