DE1261280B - Ventilator for anesthetic purposes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Jnt. CI .:

A61m

German KL: 30 k -14/01

Number: 1261280

File number: A 32681IX d / 30 k

Filing date: August 17, 1959

Open date: February 15, 1968

The invention relates to a hand-operated anesthesia device in which the volume or extent ventilation can be displayed. When supplying the anesthetic agent, the patient becomes frequent assisted in breathing by the anesthetist. For this purpose, the anesthesia machine usually has a pressure bag that can be hand pressurized to prevent inhalation during to support the breathing process; This pressure bag is available with the gaseous anesthetic containing system of the device in connection. Becomes the ruling one in the system If the pressure is reduced by not exerting any pressure on the bag by hand, the exhalation phase begins of the breathing process. If the patient breathes spontaneously, the pouch expands and contracts in accordance with the exhalation or inhalation phase.

The volume of ventilation gas supplied to the patient indicates whether ventilation is adequate has taken place. If you are able to observe the ventilation process at all times, so this means an important control over the functioning of the device and the breathing of the patient.

There is already an anesthetic device known in which a breathing bag in a rigid chamber with transparent wall and scale is arranged so that one inhaled or exhaled by the patient Can keep track of the amount of gas measured continuously. With this device, ventilation is automatic. For A special pressure bag is provided for manual operation, if necessary by turning a valve lever can be connected directly in parallel with the breathing bag. An exact display of the ventilation volume is not possible in manual mode.

The object of the invention is to create an anesthetic device in which, on the one hand, the usual hand-operated pressure bag is held, the operation of which the anesthetist gets used to has, on the other hand, the volume of the ventilation gas supplied to the patient is always accurate is shown.

This is a ventilator for anesthetic purposes, with a bellows that is in a chamber with transparent wall is arranged to observe the extended position of the bellows with a Display device is provided, and the two areas of space separates from each other, of which the first on the source for the breathing gas and / or the breathing air and to the ventilation device of the patient and the second is connected to a device with

Ventilator for anesthetic use

Applicant:

Air-Shields, Inc., Hatboro, Pa. (V. St. A.)

Representative:

Dipl.-Ing. K. Lengner, patent attorney,

2000 Hamburg 26, Jordanstr. 7th

Named as inventor:

James Otis Elam, Elma, N.Y. (V. St. A.)

Claimed priority:
V. St. v. America August 21, 1958
(756418)

which alternating pressures can be exerted on the bellows surface facing this spatial area, according to the invention designed in such a way that the device connected to the second space area has a is known, hand-operated pressure bag.

In the device according to the invention, the hand-operated pressure bag and the volume indicating bag are thus Bellows connected in series. This enables an exact display of the ventilation volume and at the same time felt by the change in shape of the pressure bag in the hand of the anesthetist. The invention is explained in more detail below with reference to the description and the drawing.

Fig. 1 shows in side view and partially in Section through an anesthesia machine according to the invention;

F i g. Fig. 2 shows in detail and on a larger scale as well as in section the valve of the display device.

An anesthetic mask 5 (FIG. 1) is connected to the gas supply via an inhalation line 6; a pipe 7 returns the exhaled gas to the system. Suitable valves ensure that the flow in the pipes 6 and 7 can only take place in the direction indicated by the arrows. The exhaled gas is returned to the system of the device through a carbon dioxide absorber 8. A tube 9 connected to a connector 10 is used to supply the ventilation gas. The breathing gas is composed of oxygen and an anesthetic gas, which are taken from the bottles 10a and 10 &.

809 SOS / 13

3 4

With this anesthesia system, a display chamber 12 immediately shows the atmospheric pressure.

device 11 in connection, which sinks from a closed; the patient can now through the

Senen chamber 12 with transparent side walls mask 5 and the tube 7 exhale. During this

is formed. Inside the chamber 12 is the exhalation process, additional ventilation

a compressible bellows 13; this bellows 5 gas supplied to the system through line 10, and

is at its lower end via a narrowed outlet together with the gas that comes out of the

outlet opening 14 connected to a channel 15 which is fed back into the system in absorber 8; this

perpendicular direction and in turn with the consequence that the bellows 13 is back on his

the pipe 9 expands through a pipe 16 and an intermediate original shape. Through the expansion piece 17 is connected. A pressure indicator 18 is on io tion of the bellows 13, the gas from the chamber

the pipe 16 is connected and shows the pressure, 12 displaced and transferred to the pressure bag 19

that prevails in the anesthesia system. which is executed again during this process

In order to be able to support the inhalation process - its compressed state 19 α in the original

nen, a pressure bag 19 is expanded by a line 20 to the initial state 19, connected to the interior of the chamber 12. Will ig To ensure that there is sufficient

that is, this pressure bag 19 is manually lumened together with the ventilation gas supplied to the system

presses, a pressure arises in it, which becomes in the In-, it is generally customary to use a quantity of gas

nere of the chamber 12 is forwarded; from there, which is slightly larger than that actually

the pressure via the bellows 13 is reduced to the required volume. In these circumstances it will Aesthetic gas containing line system transmitted, ao the upper wall 28 of the bellows 13 at the end of a

At the lower end of the tube 15 is each exhalation phase slightly higher than after

Valve 21, the details of which in FIG. 2 shows the previously terminated breathing process. In the end

are light. A valve closing plate 22 rests on one of the top wall 28 of the bellows being its outermost one

lower stationary plate 23 and locks so for reaching upper position and it becomes the tendon usually an opening provided in this plate 25 26 are tightened and the valve flap 22 of

24. Stop rods 25 are used to lift the opening stroke of their seat 23. This will cause the anesthetic

the valve plate 22 to limit. A flexible system connected to the atmosphere

Tendon 26, ζ. B. a piece of chain, engages the so that too much too much during the exhalation phase.

Valve plate 22 by means of an eyelet 27 and escaped gas into the atmosphere extends upwards; at its upper end is 30 can. As soon as pressure is applied for the inhalation phase

this tendon is connected to an approach 27 a, leads, the bellows begins to collapse again

the len on the inside of the upper end wall 28; as a result, the valve plate 22 also becomes

of the bellows 13 is seated (FIG. 1). The length of the instep is returned to its seat; now can

member 26 is chosen so that it is stretched when the pressure affect the system, and the the upper end 28 of the bellows its uppermost position- 35 inhalation phase can be in the previously described-

development achieved, d. H. play shortly before the arrival of an Anne wise man.

Blow 29 a, on the upper wall 29 of the cam- The valve 21 can also be used as a safety device mer 12 is provided. act, to the creation of a negative pressure In Fig. 1 is prevented with full lines, which is revealed in the anesthesia system Shown in the position it could wrap at the beginning of a 40. Should for some reason the Inhalation process. To prevent the patient from supplying the anesthetic gas to the system To assist the inhalation process, the pushes to be sufficient to provide the full ventilation volume Anesthesiologist to provide the pressure bag 19, resulting in the bellows 13 at jehat, that the gas contained therein pushed out the work cycle more and more coincide until and thus a pressure is generated in the chamber 12. 45 he finally got through the position 286 of the upper one This pressure exerted on the bellows 13 is indicated completely by the wall 28 Bellows on the tube 9 of the anesthesia device has reached the pressed state. In this situation it would transferred so that the anesthetic gas can easily be inhaled naturally by the patient in the pressure create a slight negative pressure through the inhalation tube 6 of the mask, will lead; the gas then escapes from this mask. If this were not taken into account and corrected, so into the patient's lungs. Only an insufficiently large one would be used in the system a pressure bag 19 of conventional type, so that the feeling of the amount of ventilation gas for the patient approximately the same are available when operating the device. Under the circumstances it would remains like a normal anesthesia machine. On the valve 22 under the influence of the resulting this way the anesthetist can open the correct pressure 55 negative pressure so that air is maintained in the hold and the desired volume of gas penetrate the esthetic system and supply the gas supplement to the patient's lungs. The train could in each case, which is fed through the line 10, led gas volume is indicated immediately by It is easy to see that a spontaneous, the degree of collapse of the bellows 13; unsupported breathing can cause widening or zuan the position of the upper bellows wall 28 (e.g. at 60 compressing the bellows 13 together so that 28 α) can be read off, namely on a scale 30, the respiratory volume even under these conditions which is displayed immediately attached to the transparent chamber wall. Is the influx of the anist. It is advisable that several of these scales of the pre-aesthetic gas are larger than required, so the appearance thus the reading from any expansion of the expandable container results in that Angle can be made out. The scale is useful - 65 the relief valve releases the excess gas, moderately calibrated in units of 100 cc. Is the one to ventilate a patient during the Breathing process ended, so the anesthetist leaves the device serving anesthesia after the pressure bag 19 free again, so that the pressure in the finder makes it easy to keep constantly

zen anesthesia process to read the volume of ventilation. The visibility of the display element from all directions increases security of the patient and ensures that adequate ventilation is taking place. It can be more accurate Adjustment of the gas supply takes place, as any inadequate supply due to the gradual decrease the position of the indicator element is displayed after each inhalation. The influx can corrective readjustments long before the situation becomes questionable. The combination the safety valve and the indicator bellows automatically ensure that excess anesthetic gas flows away without this requiring special attention on the part of the anesthetist. Even The design of the valve ensures the supply of air for the patient through the whole in an emergency System through in the event that the anesthesia system only an insufficient amount of ventilation gas should deliver. All of these details allow the anesthetist to keep the patient under constant observation because less time is needed than before to see the device itself in its mode of operation to monitor. On the other hand, the operation of the device has been maintained so that the anesthetist does not need to learn any new operating instructions.

Claims (8)

Claim: Anesthetic ventilator with a bellows that is placed in a chamber with transparent Wall is arranged to observe the extended position of the bellows with a Display device is provided, and the two areas of space separates from which the first to the source for the breathing gas and / or the breathing air and to the ventilation device of the Patient and the second is connected to a device with which on this Room area facing bellows surface alternating pressures can be exerted, characterized in that that the device connected to the second space is a known, manually operable pressure bag (19). Considered publications: German patent specifications No. 876 317, 928 505,
637; French patents No. 561 677,
1160627; U.S. Patent No. 2,847,001; Advertising leaflet from the Drägerwerk Lübeck: "Circulatory anesthesia machine model Romulus", brochure 5121, 8th edition, December 1956. 1 sheet of drawings 809 508/13 2.68 © Bundesdruckerei Berlin