TY - JOUR
AU - Amplatz, Kurt
AB - A Vascular Injector with Program Selector 1 Kurt Amplatz , M.D. Excerpt A portable cardiovascular injector previously described (1) proved satisfactory for selective cardioangiography. For peripheral angiography and especially cerebral angiography certain features were lacking, which led to the development of a new device considered suitable for any type of angiographic work. Special emphasis has been placed on simplicity of construction, on operation, and especially on compactness, since floor space is limited in most x-ray rooms. The pertinent features of this injector are: A small power source, namely, a carbon dioxide cartridge. Use of glass syringes as well as a 55-c.c. stainless steel syringe for high pressure injections. Pressure control ranging from minimal thrust up to very high pressure for selective cardioangiography. Automatic heating control in a transparent syringe holder allowing observation of the syringe. One single power cable leading to the x-ray machine. Remote control from the control panel on the x-ray machine. Built-in timer allowing multiple automatic x-ray exposures anywhere from the beginning of the injection up to 10 seconds delav. Since regular glass syringes with a ground-glass piston tend to “freeze,” special metal plungers were developed. These plungers have low friction and can be used with multifit BD glass syringes with no tendency to “freeze.” The stroke is adjusted so that a few cubic centimeters of rest volume remain in the syringe, eliminating air injection. Obviously, air bubbles can be easily detected through the transparent well illuminated syringe holder. A commercially available carbon dioxide cartridge is placed in a cartridge holder (A) (Fig.1) and punctured. The carbon dioxide gas under a pressure of 750 to 800 pounds per square inch is released. The desired pressure in the pressure cylinder is regulated by a reducing valve (B). The pressure is indicated in pounds per square inch on a manometer (C). (Example: Peripheral angiography 15 to 25 pounds, selective cardioangiography 200 to 280 pounds per square inch.) The syringe is filled with contrast medium and placed in the heated syringe holder (D), controlled by a thermostat. The first exposure is triggered from an actuator on the calibrated piston rod (E). Additional exposures can be set at half-second intervals on the mechanical timer (F). The injector is fired remotely from the x-ray control stand. A radiopaque timer is placed on the x-ray film; it is energized at the start of the injection indicating the exact time of exposure. After the injection, the syringe can be reloaded with contrast medium through the syringe (G) through a plastic tubing and three-way stopcock (H). This type of reloading has proved to be simple and fast and therefore especially practical for cerebral angiography. The two-syringe system may be left in place for the examination of several patients. For low injection pressures, as for peripheral angiography, 15 injections can be made with a single carbon dioxide cartridge.
TI - A Vascular Injector with Program Selector
JF - Radiology
DO - 10.1148/75.6.955
DA - 1960-12-01
UR - https://www.deepdyve.com/lp/radiological-society-of-north-america-inc/a-vascular-injector-with-program-selector-QuQtyk00QC
SP - 955
VL - 75
IS - 6
DP - DeepDyve
ER -