SPIROMETER
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Spiro-meter (Joint less Body)
A general purpose wedge type spirometer with a capacity of 9 liters. It is designed for teaching ‘A’ level, Medical and University classes the principles of Spirometry. It can be used in ascertaining: basal metabolic rate flowing exercise, Vital Capacity Subdivisions of Lung Volume Inspiratory and expiratory reserve volume, effect on ventilation of rebreathing CO2, hyperventilation effect on breathing patterns etc. The apparatus is manufactured from modern materials to a proven design which gives both strength and reliability. The float pivot and counter balance ensure precise movement over the float measurement range. The float capacity scale and associated pointer allow direct observation comparisons to be recorded and a thermometer sealed into the float records accurately the temperature of the float gases. Facilities are provided in the inside of the float to attach a pen to record float movement on a chart recorder. A two-way valve situated on the side of the spirometer allows the subject to be connected either to the spirometer or the atmosphere. This allows the subject to become accustomed to breathing through a mouthpiece and establish a regular breathing rhythm before starting experiments. A detachable soda-lime canister is mounted in a vertical position on the spirometer and may be inserted into the system if required. However, a closed system can be easily maintained without the canister, if the effect to rebreathing CO2 is to be investigated. Flexible corrugated tubing; 30mm diameter is used to connect a mouthpiece to the spirometer via a unidirectional valve and the soda-lime canister. Small bore tubing is fitted for the purpose of tank drainage and to facilitate flushing the system with oxygen.
This Spirometer is supplied complete with two lengths of corrugated tubing, noseclips, tube clamps, mouthpiece, pens with lever, soda lime canister and instruction manual. |
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Spiro-meter (Transparent Body) The ideal Spiro meter offers so little resistance to the movement of air to and from the subject’s lungs that does not affect the subject’s respiratory movements. This new student Spirometer has the following basic design features. Air ways that have a 30mm inside diameter - nearly 50% greater than the cross-section of the traditional 22mm bore. A one way value with a new mica disc construction that minimizes resistance. A 9 liter gas holder that pivots only on needle points acting in a metal dimple. A counterweight so designed that, when properly adjusted the gas holder is of minimal weight. As a teaching device, this spirometer also has a number of important extra features: a) It is completely made of transparent plastic, so that students can easily follow the air flow lines. b) It has an air line valve, for open or closed circuit work, that connects the line to atmosphere while the subject is becoming accustomed to the apparatus and regulating his breathing. (When a handle is raised, the line is connected to the spirometer). This makes it possible for the exact moment of the start of the rest to be determined. c) The soda lime canister can be placed in or out of the circuit by altering the connections of the tubing. The canister is transparent, so that color indicating absorbents can be used. d) There is an oxygen line leading directly to the gas holder, for experiments with oxygen consumption. e) The spirometer can be used in either open or closed circuits. The Spirometer housing is made of heavy transparent plastic 6mm thick. It measures 300 x 375 x 375mm overall (12 x 15 x 15 in). The Spirometer housing is made of heavy transparent plastic 6mm thick. It measure 300 x 375 x 375mm overall ( 12 x 15 x 15 inch ) The 9 liter gas holder is made of light transparent plastic, and carries two needle points rest in metal dimples and serve as the pivot points for the gas holder. The counterweight is free to move for adjustment on a Counter poise arm and, when adjusted, is locked in Place. On the side corner of the gas holder there is a scale 130mm long (5 1/4 in). Graduated from 0 to 9 liters in 0.1liter increments. This scale is read by a metal point that can be adjusted for zero. This corner of the gas holder also carries a mounting for a writing pointer that can be used with a Kymograph or Chart Recorder. The water chamber for sealing the gas holder has been reduced to the minimum capacity that allows easy clearance for the gas holder for the gas holder, and has a drain in its base with tubing and a plug. The 30mm bore tubing for the airways, which is made of low density polythene, is light and strong. This tubing has extremely low- profile annular rings, which offers the minimum distortion on bending and therefore preserves the maximum cross-section area. The mouthpiece is made of moulded soft rubber. It fits behind the lips, and has two soft rubber bites to locate the teeth and make it more comfortable for breathing through the mouth. The noseclip is also constructed of soft moulded rubber. This instrument is supplied with a one-way valve that fits onto the mouthpiece. This valve ensures that the gas stream flows only in one direction. On inspiration, one valve opens and the other one closes, and vice versa on expiration. The valves are a new design and consist of thin mica discs mounted in cast plastic frame. The mica disc is held at its center by a nickel plated brass threaded shank that has a soft stainless steel spring mounted on it. The mica disc moves against this soft spring and opens with the slightest positive pressure. It locks with slightest negative pressure. The mouthpiece and tubing assembling fits to a tubing valve that is mounted in the side of the spirometer base. This tubing valve can be used for either an open or closed circuit. It has tubing attachments for one or two tubes on both the back and the front. It also has two ports to atmosphere. When the rotating handle is down, the mouthpiece tube or tubes are vented to the atmosphere. When the handle is rotated up, the mouthpiece circuit is connected into the spirometer circuit. This not only allows the subject to become accustomed to the apparatus with the tubing vented to atmosphere, but also allows an exact starting time to be determined for the experiment. The soda lime canister is made of transparent plastic, and can therefore be used with a color indicating absorbent. The canister is 80mm in diameter x 125mm in length (3 ¼ x 5 in), and has a capacity of 600 ml. it mounts on a metal plate at the back of the spirometer, and can be connected in or out of the circuit by changing only one hose. |
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