Page 17025 Instruction Manual (Rev. 2)Rodent VentilatorCat. 7 0 2 5 / 7 1 2 51 GENERALThe 7025 Rodent Ventilator is a mechanically unique positive pressure pump, accordingto Starling’s ventilation method, designed for use with guinea pigs, rats, mice and smallbirds, which features:Mechanically,A. a unique valve gear with negligible dead spaceB. a novel variable stroke linkage mechanism, without sliding componentsC. no protruding elements: both the controls and the tubing connectors are re-cessed into the chassisElectrically,D. digital display of “strokes per minute”E. TTL start-stop commandF. no electronic noise broadcasting1.1 Synchronized START/STOP on model 7125The operation of the Rodent Ventilator may be “paused” by an external TTL logic signal.For more demanding electrophysiological-pharmacological investigations, an optionalsynchronised command is available to START and STOP the Ventilator during forcedinspiration. Ask for special model Cat. 7125.This feature is particularly useful when coupling the operation of the Ventilator to soft-ware for physiology or neurophysiology experiments. See paragraph 4.6-SynchronisedStart/Stop .2 INSTRUMENT DESCRIPTION2.1 KinematicsA D.C. geared motor, operated by solid state speed control, is coupled to the cylin-der/piston assembly, via a unique variable stroke linkage (see datasheet picture & Figure1 “Linkage”), with the following advantages: