The Cook Gas-Operated Dye Injector
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Before electric and
electronically controlled injectors came into common use in vascular
radiology, gas operated high pressure dye injectors were the state of the art
in the sixties and the seventies, and the Cook was one of them. It was in
high esteem and considered, in spite of its simplicity and its draw-backs, as
one of the most reliable. The injector is firmly
connected on the rear to an external high pressure gas cylinder (usually carbon
dioxide). On the front side is a cradle for a metal syringe containing the
dye and connected to the catheter, and fitted with attachments for triggering
the x-rays and the film changer. The pusher
of the injector is put in contact with the graduated plunger of the syringe,
and the injection is initiated by pushing a pedal in the gas circuit. Multiple
injections from one filling of the syringe were possible. Three syringe sizes
were available: 50, 75 and 100ml. DESCRIPTION : (From the 1967 Catalog) :
..It consists of a pneumatic
piston mounted on a chassis which holds a metal syringe. The piston is
controlled by a variable pressure-regulating valve and foot valve. When the
foot valve is depressed, the gas passes to the piston cylinder which applies
thrust to the syringe. Release of the foot valve completes the cycle. Advantages : Simplicity. Reliability. No down-time. Draw-backs : Injection rate depends on the gas pressure
in the gas cylinder, the size
of the syringe, and dimensions of the catheter. Unavailability of disposable
syringes. The injector shown has
served for many years, and thereafter was on stand by and occasionally used
when more sophisticated injectors needed servicing. Its use was totally
abandoned in the eighties.
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