1 1902 Willis Haviland Carrier invented the first air conditioner to control the temperature and humidity of a printing company, marking the first time effort taken to control the temperature of the surroundings. 2  This starts the history of air conditioning.
Following the introduction and widespread use of central venous catheters (CVCs) in adult patients, these devices are now frequently used also in the pediatric population. They have become an indispensable route for venous access, especially in pediatric intensive care units (PICUs).
Central venous catheter (also called central venous âlineâ or hemodialysis catheter) The central venous catheter. The central venous catheter is a flexible synthetic (man-made) tube that is usually placed in a. large vein in your chest. Sometimes these catheters are placed in a vein in the neck, groin or. back. Each central venous catheter has two openings called ports or limbs. One port takes. blood from your body to be cleaned by the dialysis machine and the clean blood returns to your. body through the other port. The spot where the catheter goes into the skin is called the exit site. A central venous catheter can be used while you are waiting for surgery for your AV fistula or. graft.