A pump body for a medical gear pump for sucking and irrigating has a pot-like pump housing with two cylindrical openings, in which two meshing gearwheels are embedded. With the device, in vivo free radicals typified by superoxide anions in systemic organ or tissue injury caused by cerebral ischemia reperfusion injury, severe infection or sepsis can be promptly and quantitatively monitored, and whether the in vivo tissue conditions are good or not can be accurately diagnosed. The bipolar transistor further includes the third collector region, which has higher impurity concentration than the second collector region, at the bottom of the base region. The invention further relates to a method for comfort ventilation of a vehicle seat having two seat parts, namely a seat bottom and a backrest, at least one of the seat parts comprising a ventilation system.