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The occupant classification system (OCS) determines the weight of a passenger in the front seat and transmits information to the airbag control module/unit. This is necessary for determining whether to deploy the passenger side airbag in case of a crash. A variety of factors are considered, including the passenger’s size and whether or not a child seat is installed in the front seat. The OCS can also identify if the seat is improperly positioned or if it is occupied by an out-of-position passenger. The OCS is usually a sensor or a series of sensors that are integrated into the seat tracks and connected to a circuit board. If the seat track sensor is damaged, the code B00A0 may set. This can increase the risk of serious injury in a crash. A professional should inspect the sensor and its circuit board before attempting to repair it.

Traditionally, donor hearts, lungs and livers are preserved by storing them on ice, which can lead to cold ischemia. This limits the potential pool of organs that can be safely transplanted. The TransMedics OCS system is a normothermic preservation and assessment technology that mimics human physiology and reduces ischemia, potentially increasing the number of viable transplantable organs.

Hearts can be procured for donation after brain death (DBD) or cardiac death (DCD). In DCD donors, the heart is placed on the OCS device and a continuous blood flow through the pulmonary artery cannula is established. The OCS machine then monitors the heart for normal ventricular rhythm and oxygenation. If it is found to be a non-viable donor, the superior vena cava and inferior vena cava are closed with silk ties. The patent foramen ovale is also closed with a 4-0 polypropylene suture to prevent the return of blood from the pulmonary artery back into the heart.

A heart perfusion system is then connected to the aorta and the pulmonary cannula is vented. The heart is then shifted to the back table. The superior vena cava is closed with a silk tie, and the inferior vena cava is closed with 4-0 polypropylene sutures. The aortic cannula is then opened, and warm blood is passed through the system’s compliance chamber, and oxygenated, pumped through a heater and then recirculated to the left atrium.

The OCS system provides an oxygenated blood flow of about 1 L/min, and the heart is maintained in a resting state in the OCS box cradle. After about 15 minutes, the pulmonary artery cannula and the return spout of the aortic cannula are closed. The heart is then attached to the aortic cannula, and normal coronary perfusion begins. In addition, the aortic cannula and pulmonary artery are continuously monitored. This enables a clinician to detect and correct any cardiac arrhythmias. This can be done by monitoring the coronary blood pressure, analyzing cardiac output and measuring the pulmonary artery blood flow. If there is no sign of abnormal blood pressure in the pulmonary artery, the heart can be reconditioned with another type of perfusate and reconnected to the aortic cannula for more testing.


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