Use of a "pneumatic" tube in anatomic pathology

In anticipation of the temporary relocation of Surgical Pathology some distance from the operating rooms, a "pneumatic" tube system was installed to transport fresh tissue from surgery to pathology at the Hospital of the University of Pennsylvania. The point-to-point 4-inch internal diameter system is actually of the blower or "pea-shooter" type. Side-opening carriers were preferred, and electronic sensors were installed for monitoring and safety. At the pathology end of the system, a complete panel of electrical controls exist that are capable of initiating the blower at either end, enabling full control. For possible future retrieval of stuck carriers, several points of mechanical entry were desired and constructed. The transit time over 886 feet varies with the weight of the specimen but averages 25-35 seconds. Thus far, after 32 months and 12,652 transits, no specimens have been lost or damaged. During the first few months, two specimens became stuck for reasons relating to human error but were easily retrieved. This system, in conjunction with operating room telephone intercoms, has become fully accepted and trusted by surgeons and pathologists.