GB1060949A – Analogue decompression computing device
– Google Patents
GB1060949A – Analogue decompression computing device
– Google Patents
Analogue decompression computing device
Info
Publication number
GB1060949A
GB1060949A
GB47704/65A
GB4770465A
GB1060949A
GB 1060949 A
GB1060949 A
GB 1060949A
GB 47704/65 A
GB47704/65 A
GB 47704/65A
GB 4770465 A
GB4770465 A
GB 4770465A
GB 1060949 A
GB1060949 A
GB 1060949A
Authority
GB
United Kingdom
Prior art keywords
pressure
analogue
analogues
ascent
simulated
Prior art date
1964-11-10
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
Application number
GB47704/65A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minister of National Defence of Canada
UK Secretary of State for Defence
Original Assignee
Minister of National Defence of Canada
UK Secretary of State for Defence
Priority date (The priority date 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 date listed.)
1964-11-10
Filing date
1965-11-10
Publication date
1967-03-08
1965-11-10
Application filed by Minister of National Defence of Canada, UK Secretary of State for Defence
filed
Critical
Minister of National Defence of Canada
1967-03-08
Publication of GB1060949A
publication
Critical
patent/GB1060949A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
A—HUMAN NECESSITIES
A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
A61B5/00—Measuring for diagnostic purposes; Identification of persons
A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
B—PERFORMING OPERATIONS; TRANSPORTING
B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
B63C11/02—Divers’ equipment
B63C11/32—Decompression arrangements; Exercise equipment
G—PHYSICS
G06—COMPUTING; CALCULATING OR COUNTING
G06G—ANALOGUE COMPUTERS
G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
G06G7/48—Analogue computers for specific processes, systems or devices, e.g. simulators
G06G7/60—Analogue computers for specific processes, systems or devices, e.g. simulators for living beings, e.g. their nervous systems ; for problems in the medical field
Abstract
1,060,949. Decompression analogue device. MINISTER OF NATIONAL DEFENCE OF HER MAJESTY’S CANADIAN GOVERNMENT. Nov. 10, 1965 [Nov. 10, 1964], No. 47704/65. Heading B7U. [Also in Division G4] The effects upon human beings of breathing air at changing pressures is simulated by deriving a first analogue of the inert gas component of the pressure of the air supply, deriving a plurality of second analogues each responsive in time to changes in the first analogue and having a magnitude representative of the partial pressure of inert gas dissolved in a body tissue, and controlling the rate of change of the magnitude of the first analogue so that the ratios of the magnitudes of the second analogues to the magnitude of the first analogue are maintained at values at least as low as given predetermined values for each of the second analogues. The analogues may be pneumatic, hydraulic or electrical. Fig. 1 is a schematic representation of the invention using a pneumatic analogue to simulate the changes in concentration of an inert gas dissolved in a diver’s body during a dive. Chambers 5-8 having pressure gauges G1-G4 are connected through orifices 11-14 to a manifold 1 provided with an » actual depth » gauge 9 and » ascent » and » descent » values 2, 3 respectively. Each volume-orifice combination of said chambers is adjusted to represent a time constant analogous to the gas diffusion time constant of a body tissue compartment. Gas from a high pressure source is admitted at 15 until a gauge 10 indicates a pressure corresponding to the desired maximum depth of the dive. The descent valve 3 is opened by an amount to control the simulated rate of the descent as monitored by the actual depth gauge 9, the chambers 5-8 being pressurized at a rate determined by their volumeorifice combinations. On reaching the desired maximum depth, pressure is maintained for the time scheduled for the dive, after which the descent valve 3 is closed and the ascent valve 2 opened by a manually adjustable amount to simulate the pressure decrease corresponding to ascent at a certain rate. The simulated ascent may be made as rapidly as possible provided that the pressure ratio for each simulated tissue pressure, as read on any of the gauges G1 to G4, to the pressure as read on the gauge 9 corresponding to any particular depth, does not exceed a given ratio (at which decompression sickness or » the bends » would occur) for each tissue.
GB47704/65A
1964-11-10
1965-11-10
Analogue decompression computing device
Expired
GB1060949A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
CA916148
1964-11-10
Publications (1)
Publication Number
Publication Date
GB1060949A
true
GB1060949A
(en)
1967-03-08
Family
ID=4142124
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB47704/65A
Expired
GB1060949A
(en)
1964-11-10
1965-11-10
Analogue decompression computing device
Country Status (3)
Country
Link
US
(1)
US3457393A
(en)
CH
(1)
CH437021A
(en)
GB
(1)
GB1060949A
(en)
Families Citing this family (15)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3746850A
(en)
*
1971-09-09
1973-07-17
J Moore
Diver decompression apparatus
GB1443707A
(en)
*
1972-10-30
1976-07-21
Nat Res Dev
Decompression meter
IT975891B
(en)
*
1972-11-29
1974-08-10
Alinari C
DECOMPRESSOMETER FOR SCUBA DIVING
CH552204A
(en)
*
1973-04-17
1974-07-31
Haenni & Cie Ag
MEASURING DEVICE FOR DISPLAYING A RATIO OF TWO PRESSURES OR PRESSURE DIFFERENCES PROPORTIONAL VALUE AND USE OF THE SAME AS A DIVE TIME MEASURING DEVICE.
US3872731A
(en)
*
1973-10-09
1975-03-25
Gen Electric
Miniaturized automatic decompression computer
US3910117A
(en)
*
1974-05-24
1975-10-07
Roy Wicklund
Rate of ascent guide device for underwater divers
US3933049A
(en)
*
1974-07-03
1976-01-20
Farallon Industries, Inc.
Decompression indicating instrument for divers
US3992948A
(en)
*
1974-09-27
1976-11-23
Antonio Nicholas F D
Diver information system
IT1027310B
(en)
*
1975-01-17
1978-11-20
Alinari Carlo
INSTRUMENT FOR INDICATING THE DURATION AND THE ALTITUDE OF THE DECOMPRESSION STOPS IN UNDERWATER DIVING
US4005282A
(en)
*
1975-09-25
1977-01-25
The United States Of America As Represented By The Secretary Of The Navy
Decometer
US4054783A
(en)
*
1976-03-09
1977-10-18
Wisconsin Alumni Research Foundation
Decompression plan device
US4192001A
(en)
*
1977-12-02
1980-03-04
Francesco Villa
Decompression ascent computer
WO1983000670A1
(en)
*
1981-08-27
1983-03-03
Hermann, Jürgen
Device for indicating diving parameters
US4782338A
(en)
*
1982-01-21
1988-11-01
Orca Industries, Inc.
Display scheme for decompression data
US5049864A
(en)
*
1982-01-21
1991-09-17
Orca Ii, Inc.
Display scheme for decompression data
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE726233C
(en)
*
1940-04-07
1942-10-09
Auergesellschaft Ag
Device for measuring the total content of several pressure vessels
US3094876A
(en)
*
1960-01-18
1963-06-25
American Radiator & Standard
Differential pressure gauge
US3247716A
(en)
*
1962-03-09
1966-04-26
Holley Carburetor Co
Pressure ratio indicator
US3269187A
(en)
*
1963-03-22
1966-08-30
Statham Instrument Inc
Differential pressure transducer
1965
1965-10-07
US
US493684A
patent/US3457393A/en
not_active
Expired – Lifetime
1965-11-10
GB
GB47704/65A
patent/GB1060949A/en
not_active
Expired
1965-11-10
CH
CH1550165A
patent/CH437021A/en
unknown
Also Published As
Publication number
Publication date
US3457393A
(en)
1969-07-22
CH437021A
(en)
1967-05-31
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None