GB817325A - Improvements in or relating to electrically operated warning systems - Google Patents
Improvements in or relating to electrically operated warning systemsInfo
- Publication number
- GB817325A GB817325A GB12690/55A GB1269055A GB817325A GB 817325 A GB817325 A GB 817325A GB 12690/55 A GB12690/55 A GB 12690/55A GB 1269055 A GB1269055 A GB 1269055A GB 817325 A GB817325 A GB 817325A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermistor
- mask
- contact
- wearer
- fed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract 3
- 238000004804 winding Methods 0.000 abstract 3
- 229910052770 Uranium Inorganic materials 0.000 abstract 1
- 239000011324 bead Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 239000011572 manganese Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000035812 respiration Effects 0.000 abstract 1
- 230000000241 respiratory Effects 0.000 abstract 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/006—Indicators or warning devices, e.g. of low pressure, contamination
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0051—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes with alarm devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
Landscapes
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Emergency Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
817,325. Respiratory appliances. NORMALAIR Ltd. May 1, 1956 [May 2, 1955], No. 12690/55. Class 81 (2). [Also in Group XXXVIII] In a system in which a warning device p is operated when the respiration rate of the wearer of a mask (not shown) falls below a predetermined value, the mask is provided with a diaphragm a which, on each inhalation, causes switch b to close and a current pulse to be fed to a heater winding d associated with a thermistor e which forms one arm of a Wheatstone bridge which also comprises a similar thermistor f to compensate ambient temperature variations and two resistors g and h of negligible temperature coeffiicent of resistance. The bridge output current is fed to a relay winding k and, under normal breathing conditions, maintains a movable contact m clear of a fixed contact o. When the breathing rate falls below the permitted value, the thermistor cooled during the exhalation period sufficiently to reduce the current through the relay winding k, so that contact m closes on contact o, thus operating the warning device p. The death of the wearer of the mask, or a fault in the apparatus, produces a similar effect. The thermistor e is made of a material of high negative temperature coefficient of resistance, e.g. oxides of copper, uranium, or manganese, and may be in the form of a flat strip, a spirally grooved rod, a thin-walled tube, or a bead encased in insulating cement and located, with the heater coil d, in an evacuated glass tube.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB817325A true GB817325A (en) | 1959-07-29 |
Family
ID=1720784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12690/55A Expired GB817325A (en) | 1955-05-02 | Improvements in or relating to electrically operated warning systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB817325A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3122731A (en) * | 1961-10-23 | 1964-02-25 | Robert W Hutchison | Hospital signal device |
| FR2364039A1 (en) * | 1976-09-13 | 1978-04-07 | Auergesellschaft Gmbh | Respirator monitoring and alarm system - gas consumption sensor which transmits signal to supervisor in radio communication with wearer (NL 5.3.78) |
| FR2545364A1 (en) * | 1983-05-05 | 1984-11-09 | Banyaszati Aknamelyito | ELECTRONIC ALARM DEVICE FOR BACKUP DEVICE COMPRISING A HIGH-PRESSURE GAS TANK |
| US20180147384A1 (en) * | 2015-01-27 | 2018-05-31 | W.O.M. World Of Medicine Gmbh | Method and device for controlling the temperature of the gas flow in medical devices |
| US12023446B2 (en) * | 2015-01-27 | 2024-07-02 | W.O.M. World Of Medicine Gmbh | Method and device for controlling the temperature of the gas flow in medical devices |
-
1955
- 1955-05-02 GB GB12690/55A patent/GB817325A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3122731A (en) * | 1961-10-23 | 1964-02-25 | Robert W Hutchison | Hospital signal device |
| FR2364039A1 (en) * | 1976-09-13 | 1978-04-07 | Auergesellschaft Gmbh | Respirator monitoring and alarm system - gas consumption sensor which transmits signal to supervisor in radio communication with wearer (NL 5.3.78) |
| FR2545364A1 (en) * | 1983-05-05 | 1984-11-09 | Banyaszati Aknamelyito | ELECTRONIC ALARM DEVICE FOR BACKUP DEVICE COMPRISING A HIGH-PRESSURE GAS TANK |
| US20180147384A1 (en) * | 2015-01-27 | 2018-05-31 | W.O.M. World Of Medicine Gmbh | Method and device for controlling the temperature of the gas flow in medical devices |
| US12023446B2 (en) * | 2015-01-27 | 2024-07-02 | W.O.M. World Of Medicine Gmbh | Method and device for controlling the temperature of the gas flow in medical devices |
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