US1371702A - Respirating device - Google Patents

Description

E. H. LYON.

RESPIRATING DEVICE.

APPLICATION FILED 1AN.H, I919.

Patented Mar. 15, 1921.

2 SHEETSSHEET 1.

E. H. LYON.

RESPIRATING DEVICE.

APPLICATION FILED JAN, H. 1919.

Patented Mar. 15, 1921.

2 SHEETSSHEET 2.

will,

PATENT OFFICE.

EDWARD H. LYON, OF CLEVELAND, OHIO.

'REsPinATING DEVICE.

Application filed January 11, 1919.

To all whom it may concern: 7

Be it known that I, EDWARD H. LYON, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Respirating Devices, of which the following is a specification.

My invention relates to improvements in respirating machines orresuscitating appliances particularly designed and adapted for use in resuscitating people by the introduction of fresh air or oxygen, or mixtures of these or othergases into the lungs ot' the patient, and the withdrawal of the used gases from the lungs at regular intervals.

7 The invention relates more particularly to that class or type of such machines or appliances in which the flow of fluid to and from the lungs is produced by mechanical means adapted to simulate that oi ordinary respiration.

The primary object of the invention is to provide a generally improved machine or device of this class which will be exceedingly simple in construction, cheap of manufacture, and ei'licient in use.

The fluid or gas capacity of the lungs being largely dependent upon the age and size of the patient, and, the volume of fluid or Q'as which will be drawn in and exhaled by the lungs at each breath being largely depencnt upon the capacity of the lungs, it follows that mechanism which is intended to induce artificial respiration should cause a lung movement as nearly normal as possibleJand the volume of fluid or gases introduced into and withdrawn from the lungs at each movement or impulse of the mechanism should therefore correspond. as nearly as possible, to the normal capacity oi the lungs.

A further object of the invention is therefore the provision of improved means whereby the volume of fluid which will be handled at each operation or working impulse of the mechanism will correspond, as nearly as possible, to the natural volume, together with improved volume regulator and indicator mechanism whereby the capacity ot' the machine during its worlring impulses may be ad usted trom tlme to tune to correspond with the varying exigencies oi actual service.

It being found desirable in certain cases and under certain conditions (for example Specification of Letters Patent.

Patented Mar. 15, 1921. Serial No. 270,633.

in the caseot asphyxiation) to assist or reinforce the resuscitat-ing action of ordinary air by the use or" a certain per cent. or proport on of oxygen, a still further object of the invention is therefore the provision of separate air and oxygen inlet ports, together with improved 'mixing valve and valve indicator mechanism leading to a common port communicating with the charging cylinder, whereby the ratio or proportion between oxygen and air may be controlled within wide limits and whereby the proportion which will be introduced at any instant canbe estimated by examination of a suitable scale or indicator connected to the mixer valve mechanism.

A still'turther object of the invention is the provision of an improved machine of this class which may be readily sterilized through the provision of few and simple parts which may be readily disassembled for sterilization and thereafter readily as;

sembled without the use, of wrenches or special tools.

lVith the above mentioned or other ends in view, the invention consists in the novel construction, arrangement, and combination of parts, hereinafter described, illustrated in one of its embodiments in the accompanying drawings and particularly pointed out in the appended claims,

Referring to the drawings, forming a part of this specification, Figure l, is a per spective view of a respirating machine constructed in accordance with this machine, the piston operating handle and volume regulator sleeve and volume indicator dial being partially withdrawn or elevated for the purpose of clearer illustration of the parts.

Fig. 2, a perspective view of the supporting base in a reversed position, together with a fragmentary view of the discharging cylinder and chamber, illustrating in particular the port in the cylinder walls communicating between the oxygen and air inlet ports and the oxygen and airmixing and the control valves in the supporting base and the charging cylinder and chamber above. 1

Fig. 3, a fragmentary disassembled perspective view of the detachable connect-ion between the machine body or casing and the cap or cover therefor.

Fig. 4:, aview, partly in side elevation, and partly in section,'ot' the piston plunger the mouth or of the machine, certain portions of the plunger stem and volume regulator mechanism being broken away and shown in section for the purpose of clearer illustration of the cooperating parts.

Fig. 6, an enlarged fragmentary isometric view f the oxygen and air inlet ports and fluid mixing and control valve mechanism therefor, certain parts of said valve mechanism being shown in disassembled positlon.

Fig. 7, a sectional view of the fluid discharging port and valve mechanism com: municating between the exhaust conduit of discharging cylinder and chamber and the discharge or exhaust port leading from the discharging chamber to the atmosphere or exterior of the machine.

Fig. 8, a cross sectional view of the fresh air inlet port and valve mechanism leading to the fluid mixing and control valve.

Fig. 9, a fragmentary perspective view of the piston stem or tubular plunger shank, and illustrating in particular the internal stop mechanism therefor for interlocking with and projecting through the surrounding volume regulator sleeve in variable relative positions to regulate the length of the working stroke of the piston to correspondingly regulate the volume of fluid drawn into and discharged from the charging and discharging piston chambers, respectively, in accordance with the normal lung ca pacity of the particular patient being operated upon.

Fig. 10, a perspective view of the volume regulator dial and latch mechamsm at the top of the volume regulator sleeve for eooperating with the volume indicator pointer and tubular piston stem of the operating handle.

Similar numerals of reference designate like parts throughout all the figures of the drawings.

The improved machine comprises a main body or casing 1, provided with a suitable supporting base 2, in which the valve ports and valves are located. The base 2, is pro vided with side members or legs 2, which are spaced apart a proper distance to receive the'foot of the operator in holding and stabilizing the machine, as a whole, during operation, said sidemembers or legs 2 being connected together by means of a base plate 2', and, if desired, one side of the base 2, may be provided with a name plate 2.

The cylindrical body or casing 1, forms a discharging cylinder and conjointly with the main and trunk pistons, hereinafter described, forms a discharging piston chamber 1-", immediately above the base 2, and a face piece and the suction and superposed charging cylinder 1, forming a piston charging portion 1.

The cylindrical body or casing 1, may be secured upon the base 2, in any suitable and convenient manner, as for eXample,-by

means of screws 3, as shown in Fig. 5, of the drawings.

The upper end of the body or casing 1, is provided with a removable cap or cover at, having a central opening 4:, to receive and contain the piston stem and volume regula tor sleeve, hereinafter described.

As a means of removably securing the cap or cover 4-, upon the casing 1, the outer upper marginal edges of the latter are preferably provided with oppositely disposed bayonet grooves 1, to receive and contain inwardly extending pins or projections i carried by the depending rim portion of the cover at, and adapted to be mounted therein,

as shown most clearly in Fig. 8, of the drawings.

The charging cylinder 1, is provided with a main piston 5, carrying a trunk piston 6, adapted to reciprocate in the discharging cylinder 1, said pistons 5 and 6, being preferably provided with piston rings 5 and 6 respectively. It will be observed upon reference to Fig. 5, of the drawings, that the walls of the charging cylinder 1, conjointly with the upper walls of the trunk piston 6, and the main piston 5, form an a11- nular charging portion 1, and as a means of reciprocating the main and trunk pistons and 6, said main piston 5, is provided with a tubular piston stem 7, terminating at its upper end in an operating handle loop 8, the latter, in the present instance, being provided with a depending pointer or indicator 8, for cooperating with a volume regulator dial and'a volume regulating sleeve,

hereinafter described.

As a means of limiting the reciprocatory movements of the main. and trunk pistons 5 and 6, within the charging and discharging cylinders 1 and 1, respectively, and thereby correspondingly varying the volume of fluid drawn into and discharged from said cylinders in accordance with the length of the stroke of said pistons, the tubular piston stem 7, is provided with a plurality of internally arranged spring pressed stop members 9, spaced longitudinally of the piston stem and adapted to be projected through a series of openings 7, said step members 9, in the present instance, being in the specific form of pivetally mounted latch members providing shoulders on their upper portions to engage with the under side of the cap or cover 4, immediately beneath'the opening 4?, said latch or stop members 9, being inclined on their lower sides as at 9 for detachment by the volume regulator sleeve hereinafter described, and said stop members being mounted by means of trunnions 9", extending through openings in the tubular stem 7, and being normally pressed outwardly by means of springs 10.

As a means of controlling the actuation of the stop members 9, and selectively bringing the same into projected stop positions in accordance with the various circumferential movements of a regulating and indicating device, the tubular piston stem is surrounded by a volume regulator sleeve 11, circumferentially and longitudinally movable thereon, said sleeve being provided with a series of stop receiving openings 11, spaced longitudinally to correspond with the stop members 9, and arranged circumferentially and spirally to correspond with certain circumferentially arranged markings and indications on a volume regulator dial 11*, extend ing above the cap or cover 4:, and arranged in suitable proximity to the pointer or indicator 8, of the handle 8.

As a means of locking the volume regulator sleeve 11, and volume regulator dial 11 in fixed adjusted position in accordance with the indications on the dial 11 the latter is provided with a barrel or casing 11", carrying a spring pressed plunger pin or detent 19,. the inner end of said plunger or detent being adapted to engage and interlock with a series of openings 7*, arranged circumferentially at the top of the piston stem 7.

As a means of bringing the desired stop receiving openings 11 into registry with the desired stop member 9, whereby the latter will be projected through the re istering openings of the piston stem 7, and the sleeve 11, and whereby to limit the reciprocation of the piston and correspondingly limit the volume of fluid drawn into and expelled from the piston chamber in accordance with the age and size of the patient, the regulator dial 11 is provided with a series OfClI'CllDl-r ferentially arranged markings 11 arranged to correspond with the circumferential arrangement of the stop receiving openings ll fand the corresponding longitudinal positions of the latter to correspondingly limit the reciprocation of the piston and piston stem. For example the marking indicating Infant (see Fig. 10) is in vertical alinement with the uppermost stop receiving opening 11, so as to give the shortest reciprocation or stroke of the pistons and correspondingly limit the volume, the next indication being years, the next years, the next 15 years, the next average adult? and the last adult large,

As a means of designating appropriate frequencies of piston reciprocation corresponding to the several positions of the volume regulator sleeve 11, and dial 11*, the latter is provided on its inner side or periphery with suitable numerals 11 to correspond substantially with the normal respiratory movements of the patient at the ages given.

As a means of providing a suitable supply of fluid into the inspirating or charging cylinder 1, and chamber 1 such for ex ample as air or oxygen or mixtures of the same, according to the requirements, the base 2, is provided with afresh air port 13, provided at its exterior with a nipple 13*, andcontrolled by means of a ball check valve 13 said fresh air port 13, intersecting a valve chamber 14, provided with a rotatably mounted tubular mixing valve 15, the

latter being provided with a port opening 15, adapted, when the valve 15, is in one of its extreme positions, (see Fig. 8) to fully register with the fresh air port 13, for the admission of fresh air exclusively, or when moved to an intermediate position to partially registertherewith for a partial supply of air to mix with a partial supply of oxygen from an oxygen inlet port hereinafter referred to. i

As a means of providing for a supply of pure oxygen, the relative positions of the ports 15 and 15*, with respect to the ports 13 and 16, being such that, when the valve is moved to 'a position midway between its two extreme or pure air and pure oxygen delivering positions, an equal supply of oxygen and air from the ports mentioned is received. 4

As a means of adjusting the mixing valve 15, in its various positions and also indicating the kind and proportions of fresh air or oxygen, or both, passing through the mixing valve, the projecting end of the latter is provided with a hand piece 17, removably secured therein by means of a cross pin 17, (see Fig. 6)' said'hand piece or operating member 17, being provided, onits face, with an indicator scale 17', arranged in cooperative relation to a pointer or indicator 18, and operating in an obvious manner.

The fluid passes through the mixing valve 15, and out through a port 15, leading to an inlet port 19, in the walls of the discharging cylinder 1, said port 19, communicating with the charging'cylinder 1, and annular charging portion 1.

As a means of controlling the passage of fluid from the charging cylinder to the service conduit and a face piece leading to the lugs, as hereinafter described. one end of the mixing valve 15, communicates with an inlet port 20, controlled by means of a ball check valve 21, the latter operating in a chamber in cooperative relation to a stop pin 22?, on a threaded plug 22, the port 20, communicating with a nipple 23, suitably connected to a service pipe or conduit 24, leading to a face ,;iece 25, the latter being in the specific form of a face mask adaptedto cover the mouth and nose of the patient and held in place by means of an adjustable head band 25. It will be observed that the port 15"", communicates at all times with the port 19, irrespective of the positions of the IIHK- ing valve 15, and that the ball check valve 21, will be moved toward and from its seated position with the respective impulses or reciprocations of the piston 5. i

The air is drawn from the lungs through the service pipe or conduit 26, the latter being connected to a nipple 27, communicating with a port 28, in a threaded valve housing 29, (see Fig. 7) said port 28, being controlled by means of a ball check valve 30, the ball valve 30, being retained in the valve housing 29, by means of a cross pin 31, the port 28, and valve 30 communicating with a second port 32, intersected by a port 33, communicating with the discharging portion 1 As a means of controlling the exhaust of the foul air to the atmosphere with the .movements of the trunk piston 6, the port 32, terminates in a valve opening 3a, provided with a ball check valve 35, the ball valve 35, being limited in its movements by a cross pin 36, and the valve opemng communicating with an exhaust fitting 37, leading to the atmosphere or exterior of the machine. The valve opening may be closed by means of a plug 38.

A screw 39, operates in a cross slot 40, of the tubular mixing valve 15, to limit the movements of the latter, and also retain the same longitudinally in the valve housin Havingthus described one of the embodiments of myinvention, without having at tempted to set forth all the forms in which it may be made, or all the modes of its use, what I claim and desire to secure by Letters Patent, is,--

1. In a respirating machine, piston stem carrying movable stops, and a movable sleeve having openings to selectively receive said stops.- l

2. In a respirating machine, a piston stem, and an indicator and indicator dial sleeve surrounding said piston stem, said piston stem carrying movable stop tmechanism operable by said dial sleeve at predetermined positions of the latter.

3. In a respirating machine, a piston stem carrying movable stops, and an indicating dial carrying means for moving said stops at predeterminedpositions of said dial.

1%. In a respirating machine, a piston provided with a piston stem, a sleeve surrounding the latter and provided with sleeve adjusting means, stop mechanism common to said sleeve and piston stem for limitingthe movements of said piston and piston stem, and dial and pointer mechanism on said sleeve and piston stem, respectively, for indicating predetermined positions of sa'id stop mechanism for controlling the movements of said piston.

5. In a respirating machine, a piston stem, provided with movable stops and an indicator dial carrying a sleeve provided with piston stem stop actuating mechanism operable by. said sleeve, and dial predetermined positions of the latter.

6. In a respirating machine, a piston stem having stops, and a volume indicator dial carrying a sleeve having stop receiving openings located at predetermined positions indicated by said dial.

7. Ina respirating machine, a piston stem provided with movable stop members, and a surrounding regulator sleeve having openings adapted to selectively receive said stop members as moved relatively.

8. In a respirating machine, a piston stem, an indicator dial provided with a sleeve member movable relatively of said piston stem, and stop members actuated at predetermined positions of said stem and mov- 10 able sleeve member as indicated on said dial.

9. In a respirating machine, the combination with a reciprocatory piston stem carrying an operating handle; of a sleeve and an. indicating dial, and piston stop mecha- 105 nisui carried by said piston stem and actuated by said sleeve and dial at predetermined positions of the latter.

10. In a respirating machine, a piston stem having movablestops, and a sleeve sur- 110 rounding the latter and provided with recesses adapted to selectively receive the same as moved relatively circumferentially and detachthe same as moved relatively longitudinally.

11. In a respirating machine, the combination with a reciprocatory piston stem carrying an operating handle, and an indicater finger; of an indicating dial in proximity to said handle and finger, and piston 120 stem stop mechanism movable relatively to said piston stem by said dial at predetermined positions of the latter.

12; In a respirating machine, a piston stem having spring pressedstops, and a 1:25 sleeve confining said stops having openings adapted when said sleeve is moved circumferentially to predetermined positions to selectively release said stops and when moved longitudinally to detach all of the latter until returned to its original longito predetermined positions and to detachall of the same when moved longitudinally, and a dial on said adjustable member for moving the latter and provided with means for indicating predetermined stop engaging positions.

14:. In a respirating machine, the combina tion with a charging cylinder, separate fluid inlet ports, a common induction and eduction port, and a valved outlet port; of a tubular mixing valve having port openings adapted to communicate with either or both of said separate fluid inlet ports and communicating at all times with said common induction and enuction port and said valved outlet port.

In a respirating machine, the combination with a charging cylinder and a base provided with separate fluid inlet ports, a port leading to said charging cylinder, and

a valved outlet port; of a mixing valve communicating with said separate inlet ports when in an intermediate position and with one or the other when in its extreme positions, said mixing valve communicating in all of its positions with said common port and valved outlet port.

16. In a respirating machine, the combination with a charging cylinder provided with a pair of fluid inlet ports, a port communicating with said charging cylinder, and a valved port; of a mixing valve communi eating with said pair of inlet ports when in an intermediate position and exclusively with one or the other of said ports when in its extreme positions, said mixing valve communicating in all of its positions with said port and valved port.

17. In a respirating machine, a cylinder provided with a removable cap having a piston stem opening, a piston and piston stem operable in said cylinder and opening, respectively, movable stop members carried by said piston stem, a sleeve surrounding said stem and stop members and extending through said piston stem opening and provided with means for selectively operating said stop members, and a dial on said sleeve for operating the same and provided with scale markings indicating predetermined stop operating positions.

18. In a respirating machine, a. cylinder provided with a removable cap having a piston stem openlng, a piston and p1s ton stem operable in said cylinder and openmg,

respectively, movable stop members carried by said piston stem and adapted to engage said cap on the return movement pf sa1d piston stem, a sleeve surrounding sald stem andconfining said stop members and extending through said piston; stem opening, means on said sleeve for selectively operating said stop members, and a dial ior operating said sleeve and provided with scale markings indicating predetermined stop 'operating positions of said sleeve.

19. In a respirating machine, a cylinder provided with a removable cap having a pis- 'ton'stem opening, a pistonand piston stem operable in sald cylinder and openlng,

spectively, said piston stem' terminating in an operatinghandle and pointer, movable stop members carried by said piston stem, a sleeve surrounding said stem and stop members and extending through said piston stem opening, said sleeve having openings adapted to selectively receive said stop members when moved circumferentially and adapted to detach all of said members when moved longitudinally, and a dial for operating said sleeve and provided with markings in cooperative relation to said stop members and said pointer. I

20. In a respirating machine, a reciprocatory piston provided with a piston stem carrying a plurality of longitudinally spaced spring pressed stop members adapted to limit the reciprocation of the piston stem, and a volume regulator sleeve having similarly spaced openings adapted to receive said stop members, said sleeve terminating at its top in a volume regulator dial having circumferential indications and markings corresponding to the circumferential location of said stop receiving openings on said sleeve to indicate the relative position required to receive the desired sto member and correspondingly limit the reciprocation of said piston and piston stem.

21, In a respirating machine, a cylinder provided with a removable cap having a piston stem opening, a piston and piston stem operable in said cylinder and opening, respectively, said piston stem terminating in an operating handle. movable spring pressed stop members carried by said piston stem, a movable member adiacent to said stem and confining said stop members and extending through said piston stem opening, said movable member having openings adapted to selectively receive said stop members when moved circumferentially and adapted to detach and confine all of said members when moved longitudinally, and a dial for operating said sleeve and provided with markings in cooperative relation to said stop members and'stop receiving openings.

22. In a respirating machine, the combination with a charging cylinder, a reciprocatory piston mounted therein for delivering fluid therefrom under pressure, a tubular piston stem connected therewith and provided with a handle, and a plurality of spring pressed stop members within said tubular stem and located at difierent longitudinal positions corresponding to the desired extent of piston reciprocation; eta volume regulator sleeve surrounding said stem and provided with openings dapted to receive said spring pressed stop members and located at varying angular positions, said sleeve being provided with a volume regulator dial provided with a scale, markings in alinement with said stop receiving openings, and an indicator on said handle in cooperative relation to said markings and dial. 3 v

23. 111 a respirating machine, the combination with a charging cylinder, a reciprocatory piston therein for delivering fluid. therefrom, a tubular piston stem connected therewith and provided with a handle, and spring pressed stop members carried by said tubular stem at longitudinal positions corresponding to the desired extent of piston reciprocation; of a volume regulator sleeve surrounding said stem and provided with openings having longitudinal positions corresponding to said stop members to receive said spring pressed stop members and located at different angular positions, said sleeve being providedwith a volume regulator dial provided with a scale, markings in alinement with said circumferentially spaced stop receiving openings, and an indicator on said handle in cooperative relation to said scale markings and dial.

In a respirating machine, a reciprocatory piston provided with a piston stem terminating in an operating handle, a plurality of internally arranged longitudinally spaced spring pressed stop members carried by said stem, and a circumferentially and lon gitudinally movable volume regulator sleeve having similarly longitudinally spaced stop receiving openings spaced circumterentially thereon, and a dial carried by said sleeve having markings corresponding to the circumferential location of said stop receiving openings, said sleeve being movable circumferentially to move the correspondingly located stop receiving opening into registry to receive the correspondingly longitudinally located stop," and being movable longitu dinally to disengage the stop and permit circumferential ad ustment from one stop to another. it 25. In a respirating machine, the combination with a charging cylinder, and a re ciprocatory piston provided with a piston stem having a handle and an indicator finger, longitudinally spaced spring pressed stops on said stem adaptedto be projected therefrom, a volume regulator sleeve surrounding said stem and stops and provided with spirally arranged openings located in corresponding longitudinal positions to correspondingly receive said stop members as moved circumferentially, said sleeve. being provided with. a volume regulator dial in cooperative relation to said pointer and be ing provided with markings indicating the desired position. of said stop members to thereby limit the reciprocation of the piston, and means for connecting said regulator sleeve with said tubular piston stem when adjusted.

26. in a respirating machine, areciprocatory piston provided with a piston stem terminating in an operating handle and indicator finger, a plurality of internally arranged longitudinally spaced movable stop members carried by said stem, a sleeve provided with circumi'erentially and longitudinally spaced stop receiving openings, and a dial. carried by said sleeve having markings corresponding to the circumferential location of said stop receiving openings, said sleeve being movable circumterentially by said dial to move the correspondingly longitudinally located stop as indicated by said dial and indicator finger and being movable longitudinally to disengage the stop and permit circumferential adjustment from one stop to another through said dial and indicator finger. 27. In a respirating machine, the combination with superposed charging and discharging cylinders, main and trunk pistons operable therein, respectively, and ports having check valves adapted to open and close with the upward and downward movements of said pistons; of a mixing valve communicating with some ofsaid ports and said charging cylinder, service conduits communicating with said charging and discharging cylinders and provided with a face piece, adjustable means for limiting the movements of said pistons for adjusting the volume of fluid to be delivered by the said pistons from said charging and discharging cylinders, volume indicator scale mechanism on said adjusting means for indicating ap- 'propriate volumes in accordance with of the patients, and markings on said indicating scale indicating appropriate fre quencies of reciprocation corresponding to the several volume positions of the adjusting means.

28. In a respirating machine, the combination with a charging cylinder, and a re-' ciprocatory piston mounted therein, a tubular piston stem provided at its end with a handle and an indicator finger, a plurality of spring pressed stops in said tubular stemlocated at different longitudinal positions thereon and adapted to be projected therefrom, a volume regulator sleeve surrounding said stem and provided with spirally arranged openings located in corresponding longitudinal positions to selec' tively receive said step members in accordance with the relative circumferential posi tions of said sleeve, said sleeve being pro vided with a volume regulator die] at one end in cotiperative relation to said pointer and having markings indicatingthe relative position of said stop members to thereby limit the reciprocation of the piston to correspond with the volume indicated on said dial, and means on said regulator sleeve for connecting the same with said tubular pis ton stem when adjusted.

29. In a respirating machine, a charging cylinder, a reciprocatory piston therein provided with a tubular stem teri'ninating in an operating handle, said stem being provided with a plurality of spaced spring pressed stop members, a volume regulator sleeve having a series of stop receiving openings correspondingly spaced longitudinally-to said stop members and arranged circumferentially at different angular positions to be engaged by a desired one of said stop members when moved correspondingly to limit the stroke of said piston, said regulator sleeve terminating in a volume regulator dial having scale markings thereon corresponding in position to the circumferential positions of said stop receiving openings and indicating the volume of fluid discharged by the respective reciprocations of the piston, and a scale in conjunction with said dial indicating the age of the patient for each volume or ad ustment and also 1nd1cating appropriate frequencies of reciprocation in accordance with the several positions of said volume regulator sleeve.

30. In a respirating machine, a charging cylinder, a reciprocatory piston provided with a stem and an operating handle, said stem carrying longitudinally spaced spring pressed stop members, a volume regulator sleeve surrounding said stop members and having a series of stop receiving openings correspondingly spaced longitudinally to said stop members at different circumferential positions to receive and project a desired one of said stop members when moved correspondingly, to limit the stroke of said piston, said regulator sleeve terminating in a volume regulator dial having scale markings thereon corresponding in position to the circumferential positions of said stop receiving openings and indicating the volume of fluid discharged by the respective reciprocations of the piston, and a scale in conjunction with saiddial indicating the age of the patient for each volume or adjustment and also indicating appropriate frequencies of reciprocation in accordance with the several positions of said volume regulator sleeve.

In a respirating machine, the combination with superposed inspirating and discharging cylinders and main and trunk pistions operable therein, respectively, and provided with a piston stem having movable stop members, and ports having check valves adapted to open and close with the upward and downward movements of said pistons;

of a tubular rotary'mixing valve communi- -at1ng wit 1 the ports ieading to said charging cylinder, service conduits communicating-with said charging and discharging cylinders and terminating at one end in a face piece, an adjustable sleevesurrounding said stem and having stop openings receiving said stop members for limiting the movements of said pistons and the volume of fluid to be delivered thereby from said charging and discharging cylinders, volume indica tor scale mechanism on said adjusting sleeve for indicating appropriate volumes in accordance with ages of the patients, and markings on said indicating scale indicating appropriate frequencies of reciprocation corresponding to the several volume positions bers carried by said stem and adapted to be selectively operated by said stop operating elements in accordance with the circumferential adjustment of said movable member and dial, said casing being provided with separate fluid inlet ports, check valves in said ports adapted to open and close with the upward and downward movements of said main and trunk pistons, a mixing valve communicating with said ports and provided with a dial to indicate the proportion of mixture of different fluids entering into said charging cylinder, and service conduits leading from and to said charging and discharging cylinders through the respective ports and valves, said service conduits terminating in a'face piece to be secured over the nose and mouth of the patient.

33. In a respirating machine, a casing pro vided with a central discharging cylinder and a superposed annular charging cylinder, main and trunk pistons operable therein, respectively, a piston stem terminating in an operating handle, a sleeve provided' with longitudinally and circumferentially spaced stop receiving openings and terminating at one end in a dial having indications spaced correspondingly to said circumferentially spaced openings, spring pressed stop members carried by said stem and adapted to project through said openings in accordance with the adjustment of said sleeve, said casing being provided with fluid inlet ports. check valves in said ports adapted to open and close with the upward and downward movements of said main and trunk pistons,

a mixing valve communicating with said ports and provided With a dial to indicate the proportions of mixture of different fluids entering into said charging cylinder, and service conduits leading from and to said charging and discharging cylinders through the respective ports and valves, said service nose and mouth of the patient. a 10 In testimony whereof I have affixed my signature.

EDWARD H. LYON.

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