Title of Invention	"AN ANESTHETIC VAPORIZER DEVICE"
Abstract	The present invention relates to an improved anaesthetic vaporizer.

Full Text

ANAESTHETIC VAPORIZER Field of the invention The present invention relates to an improved anaesthetic vaporizer. Background Anaesthetic liquids such as ether, halothane trilene are liquids with different boiling point Ether 34.6 °C, Halothane 50.2°C, Trilene more than 80 °C. Usually, during surgery and prior thereto, the anaesthetic liquid is kept in a glass container wherefrom it vaporizes and these vapors are administered to a patient. Over the years, various kinds of anaesthetic vaporizers have been developed. The function of an anaesthetic vaporizer is to enable vaporization of the liquid in a controlled fashion. It is reasonably independent of both changes in the ambient temperature and the volume flow of gas acts as vehicle in the vaporizer. The saturated vapor mixed with gas in Anaesthesia machine is fed to the patient depends upon the nature of the liquid and its temperature. It is important that the vaporization occurs at a constant rate, which is usually possible only if the operation theatre is provided with an air conditioner. In villages and places away from major cities, operation theaters are usually not provided with air conditioners. The rate of vaporization of the anaesthetic liquid is therefore difficult to regulate and monitor at same percentage to the patient. To solve this problem, the invention proposes an improved anaesthetic vaporizer, which may be used in summer as well as in winter. Both type of operation theatres (i) air conditioned & non-air conditioned, always suffer loss of temperature of liquid and this invention ensures that the temperature of the liquid anaesthetic is kept constant. Description of the invention To achieve the above objective, the invention proposes a system wherein the rate of vaporization of the anaesthetic is regulated by providing an environment wherein the temperature of the liquid is maintained constant and whereby the rate of vaporization is regulated. As shown in figure 1, the system of the invention includes a first chamber (10) with water kept at room temperature. A first outlet (15) from this chamber (10) ends in a second chamber (20). In this second chamber is placed a bottle (18) with the anaesthetic liquid (16). The first outlet (15) from the first chamber brings water (at room temperature) into the second chamber at a constant rate. The rate of flow of water from the first chamber (10) to the second chamber (20) may be regulated by a stop cork (14). The water from the second chamber (20) is drained out by a second outlet (25) into a bucket (30). The outlet pipe (25) may be provided with a stop cork (26) to regulate the flow of water into the bucket (30). The temperature of ether and room temperature are monitored constantly. By this system, the temperature of the anaesthetic is kept 1°C below room temperature or water of chamber (20). Since water is constantly circulating around the chamber containing the anaesthetic vaporizer (glass bottle), the temperature of the anaesthetic liquid is maintained at 1°C below room temperature. Usually, the temperature of water in the second chamber is kept at 20-30°C; for better results. Once a particular volume of the anaesthetic vaporized, it may be replenished by pouring fresh liquid into vaporizer. The main idea is to maintain the temperature of the anesthetic liquid below its boiling point and ensure that vaporization occurs at constant rate. As such, the circulation of water maintains the temperature of the liquid anaesthetic. The temperature of water in two chambers is also noted at room temperature before surgery. To assess the efficiency of the system of the invention, an example experiment was conducted and the rate of vaporization of the anaesthetic was determined. Duration of Anaesthesia remained 35 minutes. From time to time temperature of ether and water was noted. Water kept circulating from first chamber to second chamber and then outside in a bucket. Plastic is bad conductor of heat. It is the most preferred material. The results are set out in Table I and II. TABLE -1 Room Temperature Liquid Ether Temp. Range of Upper Lower Age Initial End of In Start In End variation of water water Chamber Surgery temperature Chamber (A) (B) Temp. during procedure Temp. 3 Year 26°C 26°C 26°C 20°C 11 °C to 26°C 26°C to 25°C Child 20°C TABLE - II Duration of Pulse Total Liquid Percentage of Recovery Time Anaesthesia Ether used Ether used of Patient 35 minutes 140/mt 75 ml 5% 30 minutes Table-I shows that room-temperature remained constant and temperature of liquid ether was variable. It decreased from 26°C to 11°C but by modified method again raised to 20°C. Similarly, temperature of upper first water chamber (A) remained constant. Temperature of lower second water chamber (B) decreased from 26°C to 25°C. Table-II shows that duration of Anaesthesia was about 35 minutes and complete consciousness of the patient returned after 30 minutes of stopping ether anaesthesia if 5% Ether vapor was inhaled. (Percentage is calculated by a calculation method). In this study water has circulated around Ether vaporizer and fresh liquid (Ether) poured in Ether Vaporizer to keep temperature constant, throughout anaesthesia procedure. Secondly inhaled percentage of Ether vapor to the patient was also constant while temperature remained at 20°C. Dr. Taimini (1989) worked on inhalation of ether vapor percentage which can be found out in Glass Vaporizer and which was not possible so far in Anaesthesia circuit and concluded that recovery time may have some relationship with stages of Ether anaesthesia. In previous study 75ml liquid Ether 6.6% Ether vapor and recovery time was 85 minutes; but in present study 5% Ether vapor 75 ml liquid Ether and 30 minutes recovery time was with complete consciousness. Early recovery with consciousness post operatively may be controlled by this procedure. If anaesthesia kept in III stage for short duration and then allow patient to come in consciousness automatically by spontaneous breathing, complete consciousness may get earlier. Temperature of Ether liquid may be kept constant - approximately, 25C of water of outer chamber (20), 20°C by adopting the present indigenous method by filling fresh Ether at room temperature nearly 4C of (18) make raised, which is lost due to Ether vaporization on room temperature. By pouring fresh Ether temperature is made constant for first few minutes. An advantage of this system of the invention is that water at room temperature from the first container is constantly fed to a second container wherein the anaesthetic liquid is placed whereby cold water keeps circulating around the anaesthetic liquid. By such circulation of water, the temperature of the anaesthetic liquid which is less than room temperature due to vaporization is maintained much near room temperature promotes constant rate of vaporization.

Documents:

405-del-2004-abstract.pdf

405-del-2004-claims.pdf

405-del-2004-correspondence-others.pdf

405-del-2004-correspondence-po.pdf

405-del-2004-description (complete).pdf

405-del-2004-drawings.pdf

405-del-2004-form-1.pdf

405-del-2004-form-19.pdf

405-del-2004-form-2.pdf

405-del-2004-form-26.pdf

405-del-2004-form-3.pdf

405-del-2004-form-5.pdf