US3396724A - Breathing apparatus with periodic volume change - Google Patents
Breathing apparatus with periodic volume change Download PDFInfo
- Publication number
- US3396724A US3396724A US544789A US54478966A US3396724A US 3396724 A US3396724 A US 3396724A US 544789 A US544789 A US 544789A US 54478966 A US54478966 A US 54478966A US 3396724 A US3396724 A US 3396724A
- Authority
- US
- United States
- Prior art keywords
- exhaust valve
- bag
- air
- patient
- tube
- 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 - Lifetime
Links
Images
Classifications
-
- 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
-
- 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
- A61M16/0057—Pumps therefor
- A61M16/0081—Bag or bellow in a bottle
-
- 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
- A61M16/0057—Pumps therefor
- A61M16/0075—Bellows-type
Definitions
- This invention relates to a breathing apparatus and in particular to a breathing apparatus for forcing a deep breath into the lungs of a person.
- a conventional breathing apparatus is used to force air into the lungs of a patient at predetermined intervals and for drawing air out of the lungs during intervening intervals.
- Such an apparatus has a housing containing a breathing bag and the pressure in the housing is alternately changed from greater than to less than atmospheric pressure in order to compress and expand the bag.
- An adjustable stop is used to limit the maximum expansion of the bag.
- Atelectasis that is lung collapse, can occur during the continuous breathing with such apparatus because the breathing cycle is very uniform.
- the breathing apparatus has an air inhaling tube to intermittently supply the patient with compressed air and an exhale tube having an exhaust valve.
- the exhaust valve is engageable with the valve closing mechanism which is operated by an adjustable automatic means for counting the cycles greater than and less than atmospheric pressures in the inhaling tube.
- this closure mechanism after a predetermined number of greater than atmospheric pressure cycles, keeps the exhaust valve closed during a period of air exhalation, that is during a period of greater than atmospheric pressure in the inhaling tube and also is provided with a second exhaust valve having a higher resistance than the first exhaust valve and which is connected in parallel with the first exhaust valve.
- the exhalation pressure is increased by blocking the first exhaust valve so that all of the air is not exhaled by the patient. Consequently, on the next inhaling of air, the patients lungs become filled with a larger amount of air which, in effect, means that the patient has taken a deeper breath.
- the drawing illustrates a breathing apparatus in which the air forced into the lungs is spontaneously exhaled.
- the invention can be applied to a breathing apparatus which not only forces the air into the lungs but also withdraws the air from the lungs.
- the drawing also shows the invention applied to a breathing apparatus in which pressure cycles are produced on a breathing bag mounted in a housing and connected to the inhaling tube leading to the patient.
- inhaling tube 1 leads to a patient in the direction of the arrows 2, this tube containing a check valve 3 which opens in the direction of the arrow 2.
- Tube 1 is connected to a T-pipe 4 Whose other leg contains a check valve 5 in communication with the intake air tube 6.
- Valve 5 opens in the direction of the arrow 2.
- Tube 6 is open to the atmosphere.
- Pipe 7 leads from pipe 4 into a bellows breathing bag 8 which is mounted in a housing 9 forming a chamber around bellows 8.
- Chamber 10 is connected by way of pipe 11 to a gas pressure generator 12, not shown in detail. This generator produces alternately greater than and less than atmospheric gas pressures, these pres- 3,396,724 Patented Aug. 13, 1968 sures being cyclically applied to chamber 10.
- bellows 8 The bottom of bellows 8 is closed by a heavy plate 13 which rests on a stop plate 14 but is not joined thereto.
- This stop plate is connected to a guide rod 15 which can be adjusted to various heights by a set screw 15a so as to limit the expansion of the breathing bag 8.
- the breathing bag 8 When the generator 12 produces a greater than atmospheric pressure, the breathing bag 8 is contracted and in so doing forces the air present in the bag through tube 1 into the lungs of the patient. A following less than atmospheric pressure produced by generator 12 then expands bag 8. In so doing, valve 3 closes, valve 5 opens, and air is drawn into the bag through tube 6 and pipe 7.
- the flexible diaphragm 18 is connected to pipe 11 and this diaphragm is attached by a pivot joint 19 to a pawl '20 which engages ratchet 21.
- Ratchet 21 carries a cam 22 and is kept from freely rotating by a leaf spring 23 which engages the ratchet teeth.
- Generator 12 is further connected to a pipe 24 which extends into connection with parallel pipes 25 and 26, which pipes lead to the common pipe 27 extending to tube 1.
- Pipe 24 is joined to a valve port 28 which is opened and closed by a flexible diaphragm 29. Chamber 30 opposite port 28 communicates with generator 12. When the port 28 is open, pipe 24 communicates through pipe 27 to the atmosphere.
- a greater than atmospheric pressure produced by generator 12 forces diaphragm 29 to close port 28. This also closes a first exhaust valve 31 mounted in pipe 25, which valve is normally held open by spring 32. A second exhaust valve 33 mounted in pipe 26 is also closed.
- first valve 31 is normally held open by spring 32.
- the valve head 35 of valve 31 is connected to a stud 36 which is engageable by cam 22 to close valve 31.
- cam 22 engages stud 36 of valve 31 so that the valve is held closed during one exhaling of air by the patient.
- the air can be exhaled only through second exhaust valve 33 which will open under the greater pressure thereagainst.
- the exhalation of the air of the patient is incomplete because of the resistance of valve 33 so that, during the next inhalation that the lungs are filled from bag 8, the lungs will be filled more than during the other breaths so that the patient receives in effect a deeper breath.
- the predetermined number of cycles for closing valve 31 can be easily adjusted by, for example, changing the ratchet 21.
- a breathing apparatus comprising a housing, a breathing bag in said housing, pressure means for putting said bag under greater than or less than atmospheric pressure to expand or contract said bag, first tube means joined to said bag for supplying air to a patient, second tube mea'ns'joined to said first tube means for removing air exhaled by the patient, first exhaust valve means in said second tube means in normally opened position for the release of exhaled air, pressure counting means engageable with said first exhaust valve means for closing said first exhaust valve means after a predetermined number of greater than atmospheric pressures applied to said bag, and second exhaust valve means in said second tube means having a greater resistance to opening than said first exhaust valve means for releasing a portion only of the air being exhaled by the patient.
- said pressure counting means including flexible diaphragm means movable in response to said pressure means for mechanically operating said first valve means.
- said pressure counting means further including a pawl and ratchet actuatable by said diaphragm and engageable with said first exhaust valve means.
- a breathing apparatus as in claim 4 further comprising a cam carried by the ratchet and engageable with a stud on said first exhaust valve means.
Landscapes
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED0047204 | 1965-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3396724A true US3396724A (en) | 1968-08-13 |
Family
ID=7050271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US544789A Expired - Lifetime US3396724A (en) | 1965-05-08 | 1966-04-25 | Breathing apparatus with periodic volume change |
Country Status (3)
Country | Link |
---|---|
US (1) | US3396724A (de) |
DE (1) | DE1491677A1 (de) |
GB (1) | GB1078247A (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3949753A (en) * | 1972-11-27 | 1976-04-13 | Rolf Dockhorn | Apparatus for supplying aseptic fluids |
WO1986004822A1 (en) * | 1985-02-20 | 1986-08-28 | Lars Jonsson | A device in artificial respiration- and/or anaesthetic systems |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3817091A1 (de) * | 1988-05-19 | 1989-11-30 | Draegerwerk Ag | Kolben-zylindereinheit als foerdervorrichtung in einem beatmungsgeraet |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2414747A (en) * | 1942-07-02 | 1947-01-21 | Harry M Kirschbaum | Method and apparatus for controlling the oxygen content of the blood of living animals |
US2770231A (en) * | 1954-08-18 | 1956-11-13 | Smith Welding Equipment Corp | Respirator system |
US2969789A (en) * | 1956-03-23 | 1961-01-31 | Morch Ernst Trier | Respirator |
US2972345A (en) * | 1955-10-26 | 1961-02-21 | Spigel Robert | Respirator |
US3033196A (en) * | 1957-09-16 | 1962-05-08 | Air Reduction | Artificial respiration apparatus |
US3033195A (en) * | 1957-09-16 | 1962-05-08 | Air Reduction | Respirator apparatus and method |
US3068857A (en) * | 1958-11-19 | 1962-12-18 | British Oxygen Co Ltd | Apparatus for controlling or assisting respiration |
US3251359A (en) * | 1963-04-25 | 1966-05-17 | Ismach Aaron | Automatic intermittent positive pressure ventilators |
-
1965
- 1965-05-08 DE DE19651491677 patent/DE1491677A1/de active Pending
-
1966
- 1966-04-25 US US544789A patent/US3396724A/en not_active Expired - Lifetime
- 1966-05-09 GB GB20534/66A patent/GB1078247A/en not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2414747A (en) * | 1942-07-02 | 1947-01-21 | Harry M Kirschbaum | Method and apparatus for controlling the oxygen content of the blood of living animals |
US2770231A (en) * | 1954-08-18 | 1956-11-13 | Smith Welding Equipment Corp | Respirator system |
US2972345A (en) * | 1955-10-26 | 1961-02-21 | Spigel Robert | Respirator |
US2969789A (en) * | 1956-03-23 | 1961-01-31 | Morch Ernst Trier | Respirator |
US3033196A (en) * | 1957-09-16 | 1962-05-08 | Air Reduction | Artificial respiration apparatus |
US3033195A (en) * | 1957-09-16 | 1962-05-08 | Air Reduction | Respirator apparatus and method |
US3068857A (en) * | 1958-11-19 | 1962-12-18 | British Oxygen Co Ltd | Apparatus for controlling or assisting respiration |
US3251359A (en) * | 1963-04-25 | 1966-05-17 | Ismach Aaron | Automatic intermittent positive pressure ventilators |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3949753A (en) * | 1972-11-27 | 1976-04-13 | Rolf Dockhorn | Apparatus for supplying aseptic fluids |
WO1986004822A1 (en) * | 1985-02-20 | 1986-08-28 | Lars Jonsson | A device in artificial respiration- and/or anaesthetic systems |
Also Published As
Publication number | Publication date |
---|---|
GB1078247A (en) | 1967-08-09 |
DE1491677A1 (de) | 1969-11-27 |
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