Recording timer for arteriography.

Abstract

The timing of films made rapidly during arteriography is difficult with a stop watch and, at best, an estimate is all that can be achieved. The timer herein described was developed to overcome this difficulty. A simple electric clock motor was mounted in a case and a plastic disk was mounted on the shaft. Small lead numbers and serrated markings were placed around the edge of this disk, which projected just beyond the margin of the clock case. The placement of the numbers on the disk was made after timing its rotation. A handy switch was placed in the line cord of the clock to turn it on. In use, after the patient has been positioned, the timer is so placed that its image will be on the film. The switch is located near the operator of the rapid film changer and is closed at the beginning of the injection of opaque material. Thereafter, the time after injection is recorded on each film as it is taken. This timer has been used for approximately a year and a half for over 200 arteriograms with satisfactory r...