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Volume controlled ventilators

RODENT VENTILATOR UB 7025
	Advantages: Simple adjustment of stroke volume, also while running. Adjustment knobs readily accessible Very small and constant dead space (does not alter when changing stroke volume). Electrically driven, independent of compressed air. Compact construction, no projecting components. No vibration, little noise.
	Order numbers: 7025 Rodent ventilator, complete with 5ml, 10ml, 30 ml or 50ml cylinder 7128 5ml cylinder 7026 10 ml cylinder, with piston 7027 30 ml cylinder, with piston xxxx  50ml cylinder, with piston 7028 Set of O-rings for 10 ml cylinder 7029 Set of O-rings for 30 ml cylinder 7030 Valve block, complete 7031 Spare Plexiglas window 7032 Plastic cover 7033 Tube Silicone grease 7034 Operating Instructions
The ventilator UB 7025 operates on the principle of the STARLING pump (positive pressure ventilation). The ventilator is designed for small animals such as guinea-pigs, rats and hamsters. The respiration rate is adjustable between 20 and 180 strokes per minute. General details: The animal is connected through a Y-piece fitting to the ventilator. The single outlet of the fitting is attached to the intubation fitting or inserted into the trachea, the two outlets of the Y-piece are connected with the ventilator through tubing as shown in the diagram. The connecting tubing should be as short as possible to avoid any appreciable increase in the low dead volume. The expired air from the animal can be collected at the top outlet of the ventilator, analysed, or returned through a C02 absorber. For testing purposes a small rubber balloon can be attached to the single outlet of the Y-piece in order to observe the volume changes. The ventiiator 7025 produces constant-volume ventilation in accordance with the set volume. It is advisable to provide overpressure protection; a beaker is filled with water and a tube is immersed in it so that the immersion depth limits the inspiration pressure (e.g. to 8 cm H20) while excess air escapes through the water. The immersion tube is connected through a T-piece into the supply line from the ventilator to the animal. For the generation of a positive end-expiratory pressure (PEEP) which prevents collapse of the alveolae when the thorax is opened, the air outlet from the pump can be connected directly to an immersion tube; in this way the expired air has to overcome the backpressure set by the immersion depth of the immersion tube. The ventilator is driven by a shunt motor whose speed is regulated by electronic control. The ventilator can be fitted either with a 5, 10, 30, and 50 ml cylinder. The cylinder is screwed directly to the housing of the control valve so that valve slide travels up and down directly before the end of the cylinder. This ensures short connections and minimum dead volume. The stroke adjustment mechanism is specially designed so that the piston always travels up to the cylinder end at the control valve, irrespective of the volume setting. This ensures that the entire air volume contained in the cylinder is ejected (no undefined dead volume when changing the respiration volume!). The required volume is adjusted on a triangular knob between 1 and 10 ml for the 10 ml cylinder, and between 3 and 30 ml for the 30 ml cylinder. The adjustment can be made with the ventilator either stopped or moving. A 6cm long scale is arranged on the circular adjustment disc; il permits accurate and reproducible setting of the required volume. Heavy-duty guides and bearings ensure perfect mechanical operation so that the crank drive operates without any need for maintenance. Absence of play in the mechanical drive ensures a low noise level.
TECHNICAL DATA stroke volume 5 ml cylinder: 0.5-5 ml 10 ml cylinder: 1-10 ml 30 ml cylinder: 3-30 ml 50 ml cylinder: 5-50 ml rate  20-180 strokes per minute overall dimensions  26 x 27 x 18 cm weight  9.5 kg  mains supply  220V, 50Hz, 40VA max.

CAT/RABBIT VENTILATOR UB 6025
	New Look Ventilator, featuring: Compact Valve Block with negligible "dead spaces" Original Variable Stroke Linkage, without sliding components No protruding element: recessed controls and hook-up connections to the animal
The UB 6025 Cat/Rabbit Ventilator is a positive pressure pump (according to Starling's ventilation method), designed for use with cats, rabbits and small dogs. It basically consists of a shunt wound motor operated by a solid state speed control, coupled to a 50 or 100 ml piston/cylinder assembly via an original variable stroke linkage (see picture) which features: The piston almost touches the cylinder end at each stroke, regardless of the preset volume. This insures that all air taken into the pump is expelled at each stroke. The volume is adjustable by means of a knob while the pump is either running or at standstill. Volume is clearly indicated on a STATIONARY DIAL and not on a mobile slotted link or by graduation marks on the cylinder, both systems leading to uncomfortable volume setting, the latter adjustable with pump in motion only. The mechanism does not incorporate any slotted link as all other ventilators do. The reciprocating motion is generated, adjusted and transmitted to the piston by rods and articulated joints only. The lack of sliding friction leads to: a) practically no wear b) no backlash and hence silent operation and exact stroke reproducibility. A crank-link combination operates the slide valve, located perpendicularly to the cylinder axis, ensuring cylinder/valve connections very short and hence minimum dead space. Hook-up to animal A "Y" connection should be inserted between the connection to the animal (cannula etc.) and the two tubes coming from the pump. Dead space is minimized if the "Y" is as close to the animal as possible (see sketch). Rate and Volume The speed control potentiometer is provided with a dial located on the front panel (see picture). The linear scale STROKES P.M. (strokes per minute) with a 10 s.p.m. division provides adequate precision and reproducibility. The stroke volume is adjusted by the STROKE VOLUME knob on the front panel, being the volume in ml indicated on the double scale disk dial 10-50 and 20-100 ml (see picture). Expired air can be recovered at the collection tube (see sketch) for sampling, partial or total recycling, etc. Room air or any non explosive mixture can be used to feed the pump intake.
TECHNICAL DATA stroke volume 50 ml cylinder: 10-50 ml 100mlcylinder: 20-100 ml rate  5-100/min overall dimensions  26 x 24.5 x 18 cm  weight  10.5 kg  mains supply  115 or 220 Volt, 50/60 Hz, 60VA max.

DOG VENTILATOR UB 5025
	New Look Ventilator, featuring: Compact Valve Block with negligible "dead spaces" Original Variable Stroke Linkage, without sliding components No protruding element: recessed controls and hook-up connections to the animal Attractive trolley which moves swiftly thanks to its heavy-duty casters
The UB 5025 Dog Ventilator is a positive pressure pump (according to Starling's ventilation method), designed for use with dogs. It basically consists of a squirrel cage motor operated by a solid state inverter/speed control, coupled to a 700 ml piston/cylinder assembly via an original variable stroke linkage (see picture) which features: The piston almost touches the cylinder end at each stroke, regardless of the preset volume.This insures that all air taken into the pump is expelled at each stroke. The volume is adjustable by means of a thumb wheel while the pump is either running or at standstill. Volume is clearly indicated on a STATIONARY DIAL and not on a mobile slotted link or by graduation marks on the cylinder, both systems leading to uncomfortable volume setting, the latter adlustable with pump in motion only. The mechanism does not incorporate any slotted link as all other ventilators do. The reciprocating motion is generated, adjusted and transmitted to the piston by rods and articulated joints only. The lack of sliding friction leads to: a) practically no wear b) no backlash and hence silent operation and exact stroke reproducibility. A crank-link combination operates the slide valve, located perpendicularly to the cylinder axis, ensuring cylinder/valve connections very short and hence minimum dead space. Hook-up to animal A "Y" connection should be inserted between the connection to the animal (cannula etc.) and the two tubes coming from the pump. Dead space is minimized if the "Y" is as close to the animal as possible (see sketch). Rate and Volume The speed control potentiometer is provided with a dial located on the front panel (see picture). The linear scale STROKES P. M. (strokes per minute) with a 5 s.p.m. division provides adequate precision and reproducibility. The stroke volume is adjusted by the STROKE VOLUME thumb wheel on the front panel, being the volume in ml indicated on the setting disc dial. Division 50 ml. Expired air can be recovered at the collection tube (see sketch) for sampling, partial or total recycling, etc. Room air or any non explosive mixture can be used to feed the pump intake.
TECHNICAL DATA stroke volume 100-700 ml, adjustable within scale divisions of 50 ml continuously  rate  10-50/min  overall dimensions  45 x 38 x 83 cm  weight  30 kg  mains supply  115 or 220 V, 50/60 Hz, 300 VA max.

HUGO SACHS ELEKTRONIK-HARVARD APPARATUS GmbH
Gruenstrasse 1 · D-79232 March-Hugstetten · GERMANY
Phone: +49 (0) 76 65 - 92 00-0 · Fax: +49 (0) 76 65 - 92 00-90