Title of Invention

AN AIR VENTILATOR ALARM FOR A VENT I LATOR OR ART I FICIAL RESPIRATORY SYSTEM

Abstract

ABSTRACTS This invention relates to an air ventilator alarm for a ventiletor or artificial respiratory system Comprising £,£ ventilator or respirator connectible to a patient through a humidifier and patient circuit, and an alarm charaterised in b. a sensor c a transducer connected to said sensor d. an alarm connected to said transducer through an amplifier (b) said sensor comprising an air tunnel with a limb estending There from so as to form an inverted 'T' member (b2) a displatesble member in said limbs.

Full Text

A still further object of this invention is to propose an alarm system for a ventilator which is very much sensitive to any dis¬connection or leak in the circuit. Yet a further object of this invention is to propose an alarm system for a ventilation which is capable of giving both audible £is well as visual alarm. Further objects and advantages of this invention will be more apparent from the ensuing description. At the outset of the description which follows, it is to be understood that the ensuing description only illustrates a particular form of this invention. However, such a particular form is only an exemplary embodiment without intending to be understood as an exemplary embodiment and teaching of the invention and not intended to be taken restrictively. The invention will now be explained in greater detail in the ensuing description and illustrated with the help of the accom¬panying drawings where Fig.l shows the ventilator alarm connected to the ventilator through an external line; Fig.2(a) shows a block diagram of the mode of connection of the alarm; Fig.2(b) shows the sensor in the form of an inverted 'T' member; Fig-2(c) shows the structural design of the transducer; Fig.2(d) is a block diagram of the electronic circuit; Fig.2(e) is a cross-sectional view of the inverted T-member. Fig.1(a) of the accompanying drawings shows how the alarm 2 connected to s ventilator 1 and a humidifier 3 and to a patient through a patient circuit 4. The alarm is normally connected to the inspiratory limb of the ventilator. Alternatively, alarm 2 also can be kept auiay from the patient or ventilator 1 by connec¬ting an external line as shown in Fig.1(b). This alarm system can also be connected to the expiratory limb. The block diagram of the system is shown in Fig.2(3) and comprises a sensor 5 connected to a transducer 6. The alarms 8 S Sensor 5 basically consists of an air tunnel as shown in Fig.2 can enable an alarm circuit after this 5 seconds if the monoshort circuit is not receiving any other pulse within this time. In other words, if the ball is not lifted up within thie 5 seconds, it will enable the alarm circuit. The audible alarm circuit is an intermittent tone generator and the visual alarm is an interini ttent blinking LED. Once the alarm circuit is enabled, it continues to give alram till the fault Js rectified. A reset button is provided to reset the alarm. But this can be reset only for few seconds. In the fault is not rectified within the few seconds, this will again give alarm. If by any chance the fault is sutumatically rectified, the alarm also cresses automtatically. WE CLAIM: 1. An air ventilator alarm for a ventilator or artificial respiratory system comprising : a ventilator or respirator (1) connectible to a patient through a humidifier (3) and patient circuit characterised in that said alarm system comprises : a sensor (5), a transducer (6) connected to said sensor (5), an alarm (7,8) connected to said transducer through an amplifier, said sensor comprising an air tunnel (12) with a limb (11) extending therefrom so as to form an inverted 'T' member, a displsceable member (21) in said limb (11). 2. An air ventilator alarm as claimed in claim 1 comprising a knife edge ring (10) disposed in said limb for supporting said displaceable member, a hole provided in said limb and closable by said displaceable member. 3. An air ventilator alarm as claimed in claim 1 wherein said transducer comprises an opto coupler (18) disposed diagonally opposite to each other on the cup of said sensor. 4. An air ventilator alarm as claimed in claim 3 wherein said opto coupler comprises a transmitter (14) which is an incande¬scent lamp and s receiver which is a photo sensitive detector (13) . 5. An air ventilator alarm as claimed in claim 4 wherein said transmitter and detector are disposed diagonally opposite on the side walls of said cup and such that during a rising movement of the displaceable member, the light beam from said lamp is inter¬rupted and causes a variation in the output signal of said detector. 6. Air air ventilator alarm as claimed in claim 5 wherein a switching circuit is connected to said detector. 7. An air ventilator alarm as claimed in claim 6 wherein said switching circuit is a pulse generator 8. An air ventilator alarm as claimed in claim 7 wherein a retriggerable monoshort multi-vibrator 9. An air ventilator alarm for a ventilator or artificial respi¬ ratory system substantially as herein described and illustrated.

Documents:

137-mas-95 abstract.pdf

137-mas-95 claims.pdf

137-mas-95 correspondences-others.pdf

137-mas-95 correspondences-po.pdf

137-mas-95 description (complete).pdf

137-mas-95 drawings.pdf

137-mas-95 form-1.pdf

137-mas-95 form-26.pdf

137-mas-95 form-4.pdf

137-mas-95 others document.pdf