DE1944006A1 - Inoculation gun with delay device - Google Patents

Description

■ Oscar Henry Banker ■

261 Breezewood Drive Munich * on August 29th, 1969

Bay Village, Ohio 44140 USA ⁽ Attorney File M-826)

Inoculation gun with delay device

The invention relates to gas-operated vaccination guns, which are intended to replace to inject vaccine under the skin \ a patient's subcutaneous needle.

A vaccination gun with a fluidized piston is known (U.S. Patent 3,293,622) connected to the rod of a smaller piston which is part of; a vaccine pump ", the latter has one; small · ^: opening through which the vaccine is expelled »The fluid for actuating the plunger is preferably COg gas> supplied by a bottle, the size of which depends on the likely frequency of use of the vaccination gun! is in tune. For an occasional use of the Flasch4 can be so great that it summarizes 8.5 g, said bottles size '

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easy ', is borrowed and carried in the handle of the pistol can be "With so small sizes it has however, it has been shown that the number of inoculations per bottle is less than expected. Furthermore, the pressure exerted on the vaccine may not be sufficient to produce a "satisfactory." Vaccination to surrender "

The invention is therefore based on the object, a gas-operated To create vaccination gun at the correct working pressure the pistol, especially the vaccine, is always ensured '

With the vaccination gun according to the invention can be advantageous Way a larger number of vaccinations can be achieved with the same amount of gas ^ Operation of the vaccination gun is blocked if the gas pressure is not sufficient for a satisfactory vaccination to create"

In an advantageous manner, in the case of the vaccination pistol according to the invention the pressure under which the vaccine is delivered can be varied so that it is adapted to the skin of the patient.

An embodiment of the invention will now be based on the attached drawings. It shows: FIG. 1 a partial side view, partially in section, a gas-powered vaccination gun according to the invention;

FIG. 2 is an enlarged end view of part of the FIG. 1 gun shown in the direction of the arrows 2-2; !

3 shows a partially sectioned top view of part of the pistol mechanism in the direction of the arrows 3-3 ] of FIG. 4-j. _r , \. '■■■;

-3- 1944Q06

4 is an enlarged, partial side view in section the pistol shown in Fig. 1, the er.findungsgemäße Facility is shown prior to actuation of the gun?

Fig. 5 is the same partial side view as in Fig. 4, wherein

the device according to the invention in its actuated ν state is shown; and

6 is a further enlarged side elevational view in section of the pressure actuated plunger through which the operation of the Inoculation device is controlled.

The Erfindungsaufgäbe is achieved in the preferred embodiment in that a pawl is provided to the gas-actuated piston of the gun ge ^ un movement hold until the pressure of the gas reaches a predetermined value. The pawl is released by a small plunger which extends through the gun housing from the cylinder for the piston and thereby overcomes the "pressure of the gas in this cylinder" at one end when the pressure in the cylinder reaches the predetermined value the plunger takes up the resistance of the pawl and moves the pawl so that the piston is released. A valve in the plunger, which is operated by the gas-operated piston, shuts off the gas supply to the cylinder when the piston is released and at the end of the piston’s working stroke when the gas is expelled, it is moved back by a spring provided for this purpose , whereby the pawl holding the piston is reset and the plunger is moved back to its original position by the pawl »The valve in the

00981 1./1020

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The plunger is pushed open by the trapped gas that by the return movement of the gas-actuated piston under pressure ■ is set. The valve is then through the in its end; position held piston open. The resistance that the pawl opposes to a movement of the plunger, is given by a spring that is used to change the gas pressure can be set at which the vaccination takes place »

In FIG. 1, a gas-operated vaccination gun according to the invention is shown in section. Similar to our own US Pat. No. 3,293-622, the gun has a housing 10 with a cylinder 11 arranged therein, in which a piston 1 2 , and movably mounted 1st to pressurize the vaccine. add "The piston 12 is connected via a piston rod 13 to a power pump 14, which is only shown in outline. This power pump draws the medicament in predetermined doses from an ampoule 15, which is fastened in an inverted position to the pump 14 by a clamp 16. The pump 14 pushes the drug through a nozzle 17, which has a small opening, so that a small stream 18 of the drug is generated which is injected under high pressure into the patient's skin. The pressure of the drug leaving the nozzle 17 is sufficient to penetrate the patient's skin.

The piston 12 can be moved to the left (viewing direction as in FIG. 1) on its working stroke, for example through ■

2 a gas such as COp under a pressure of about 14 kg / cm, which in a bottle 19 is contained, which is received by a hollow handle 20 which is attached to the housing 10 of the pistol

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if the pistol is only used occasionally for vaccination should be used, a small bottle of about '

8.5 g COp at a pressure of 56 kg / cm are sufficient, with such a bottle is small enough to be picked up by the handle 20, if many people are being vaccinated at the same time the COp can be taken from a large cylinder connected to the gun with suitable hose lines o

The gas is passed through a hollow tube 21 to a trigger operated Valve 22, from this through a channel 23 in the housing 10 to the control valve 24 of the delay device and from there fed to the cylinder 11 “A manually operated trigger 25 actuates a plunger 26, which in turn operates the valve 22 actuated by the trigger.

In known vaccination guns which are not provided with the delay device according to the invention, the actuation of the trigger-operated valve 22 enables gas under pressure to enter the cylinder 11 behind the piston 12, as soon as the pressure exerted on the piston 12 exceeds the pressure of the return spring 26 exceeds for the piston, the piston moves to the left and actuates the pump 14 «This often resulted; a movement of the piston that was too slow to generate the necessary impact pressure in the pump 14, so that. hence the ^: vaccine did not leave nozzle 17 with sufficiently high pressure; In order to penetrate the patient's skin, it has been shown that a high initial vaccination pressure is necessary in order to:

i penetrate skin, but that once the skin is pierced i

is, the pressure can be reduced significantly without

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the effectiveness of the vaccine drops; i.e. without the Amount of vaccine injected correspondingly decreased. It is therefore important that the vaccine be pressurized initially becomes, as if by a sudden activation of the piston 12, and not by a gradual movement of the same »

In Figure 4 the ram and device are shown through which the piston is held back until there is enough pressure behind it is constructed to pressurize the vaccine in a suitable manner »on the piston 12 (Fig. 4) is at the rear At the end of a rod 24 attached, on the end of which a nut 29 is screwed on. Between the nut 29 and the housing 10 several hook-shaped metering parts 30 (Fig. 1) are arranged, which serve to hold the nut 29 after it has been displaced by a predetermined "distance, so that the piston 12 and the associated pump 14 is locked to the amount or regulate the dose of the vaccine injected into the patient. When these metering parts 30 (Fig. 2) over the Rod 28 are hooked, they hold the nut 29 and the associated rod 28 and the piston 12 so that through Unscrewing a predetermined number of metering parts 30 out of the way of the mother, the dose (vaccination amount) can be regulated can.

The delay device of the invention is designed so that they use the nut 29 to hold the piston 12 against bending used in its cylinder 11 until enough pressure has built up in the cylinder behind the piston 12, which is used for pressurizing the vaccine is sufficient »

The delay device consists of one on a pin

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0981171020

. ». 1944008

32 pivotably mounted trigger 31, which is held by the sides of a U-shaped retaining bracket 22 (Fig. 3) β This bracket 33 has diverging mounting flanges 34 and 35, with which it is attached to the housing 10 (Fig. 2) The trigger 31 has spaced projections 36 and 37 between which the nut 27 can be retained. The extension 36 serves as a stop to prevent the movement of the nut 29 and the associated rod 28 and the piston 12 to the left (FIG. 4 Y) . The extension 37 is used, as will be described below, to move the trigger 31 into the to move back the position shown in Fig. 4 after the trigger has been released once and the piston 12 has been actuated.

On the underside of the trigger 31 (FIG. 4) is a tooth 38 formed, which is formed similar to a switching tooth with which a pawl 39 can interact. The pawl 39 has a tooth 40 which engages in tooth 38 «The pawl is pivotably mounted on a pin at 41, the also held by the sides of the U-shaped retaining bracket 33 will. A Blattfedeit 42 is the space between the Arranged pawl 39 and the underside 43 of the U-shaped bracket. The leaf spring 42 is at one end 44 below hooked into this underside 43 and clamped to it by a nut 45 which is screwed on via a thumb screw 46 is. The latter is in turn screwed into the underside 43 and extends through this in contact with it the leaf spring 42. The pressure exerted by the spring 42 against the pawl 39 can be regulated by the thumb screw 46

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will. The selected pressure can then be passed through the nut 45 '

; firmly set as blocking mothers for the thumb.

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screw 46 worked!

■ ' j

The pawl 39 has a vertical arm 46 'which extends to J

if "

extends up to the vicinity of a plunger 47, the> 'forms part of the control valve 24, the plunger 47 (Figo;

6) is mounted slidably in a bore 48 which communicates with a] of the ahzugbetätigten valve 22 coming passage 23 in communication. The S.tößel has a circumferential groove 49 which is connected by transverse bores 50 to a central recess 51 in the W tappet 47, which is in connection with the cylinder 11 behind the piston 12 and forms the means through which the gas is under pressure in this cylinder is introduced.

In the central recess 51 a three-stage valve member 52 is arranged, the section 53 of which has the largest diameter has a slight play in the central recess, so that Sas can pass it into the recess. The middle section 54 has such a distance between itself and the bore so that gas can freely pass between them, \ and the smallest portion 55 extends out of the plunger

• to the left in contact, with the back of the piston 12 out, · Between the sections 54 and 55, a shoulder 56 is formed, which cooperates as a valve with a seat 57, the in an insert 58 pressed into the end of the plunger 47 is trained. Two O-rings 59 are around the tappet 47

j arranged on the sides of the circumferential groove 49 to counter the hat. ; to seal over the atmosphere.

"- ■■ ι The right end 6Ό (Figures 4-6) of the plunger 47 stands out;

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the housing 10 in contact with the adjacent surface 61 of the vertical arm 46 *. the pawl 39 emerges “The latter is held against rotation by the above-mentioned spring 42;

The operation of the device is described below. At the beginning, the parts of the vaccination gun have the positions shown in FIGS lifted from the seat in the insert 58 and is therefore in the open position. The plunger 47 presses against the arm 46 * ο The spring 42, however, holds the arm 46 ¹ and the pawl 39 with its tooth 40 in contact with the tooth 38 of the trigger 31 »

When actuation of the vaccination gun is desired, the presses Doctor pulls the trigger 25 »to open the valve 22, which then lets gas into the passage 23 under the pressure of 56 kg / cm. That Pressurized gas flows into the circumferential groove 49, the transverse bores 50 and the recesses 51 * where it goes to the bottom of the recess behind the The end of the valve member 52 flows. The rest flows around the valve body 52 past the insert 58 and into the cylinder 11 behind the piston 12. When the resistance of the return spring 27 is exceeded by the gas pressure in the cylinder 11, the piston 12 tries to move to the left (Fig. 1), > but held back by the trigger 31. j

The gas in the cylinder 11 pushes against the end at the same time;

of the plunger 47, which in turn presses against the arm 46 'in order to pivot the pawl 39 and to release the trigger 31. The spring 42 provides a resistance to the plunger 47.

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against, in the exemplary embodiment shown with a me-; ch.anisch.en translation of 3: 1 is exercised. Therefore, the pressure in the cylinder 11 continues to build up, instead of being converted into a movement of the piston until the pressure reaches a predetermined value, In one embodiment it has ^;

* ■ ^r ,

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It has been shown "that a pressure of 14 kg / cm is satisfactory.; The lower the pressure, the smaller is apparently ⁰ (read; gas volume used. At this pressure, the spring 42 gives way, the pawl 39 is pivoted clockwise ( Fig. 5) and the trigger 31 is pushed out of the way by the nut 29, while the piston 12 is released to carry out its working stroke.

As soon as the tappet 47 moves away from the piston 12, the valve member 52 is pushed onto the seat 58 by the gas pressure in the recess 51 behind the valve member so that the recess is closed off from the cylinder 1-1 . Removing the cylinder ^11;. locked and the plunger 12 is moved by the expansion of the trapped behind the piston gas "the movement of the piston 12 is performed except gewähnlieh rapidly and therefore there is a risk that it the trigger 31 excessively about the pin - 32 · swings around, leaving it in an undesirable position for the next working cycle.As a result, the movement of the trigger 31 is slowed down by the insertion of a ball 62 (Fig. 3), which is held by a spring 63 against a hole 64 the inside of the U-shaped retaining bracket 33 j. The spring 63 is seated in a recess 65 in the trigger 3T and acts on the trigger in such a way that it moves against j

00981Ί / Τ020

the opposite side of the bow is held. Through this a frictional force is generated, which additionally brakes the free movement of the trigger 31, so that the trigger in Figure 5 assumes the position shown after the nut 29 has moved over him. The expanded gas in the cylinder 11 is kept locked in it as long as the trigger is held in its operating position by the doctor.

The valve 22 is designed in such a way that it vented the exhaust duct 25 and the cylinder 11 connected to it when the doctor releases the trigger 25. When the gas has been emptied from the cylinder, the return spring 27 becomes effective and pushes the piston 12, its rod 28 and the nut 29 back into the position shown in FIG. The nut 29 engages the shoulder 37 and pivots the trigger 31 clockwise (Figures 4 and 5) until the tooth 40 of the pawl 39 again engages the tooth 38 of the trigger 31 due to the continuous, upward pressure, which is exerted against the pawl 39 by the spring.

The device according to the invention therefore creates means that the Block the operation of a gas-operated vaccination gun until a vorjestiminter Pressure in the actuation cylinder of the vaccination gun is generated. If the pressure is not available because the source is consumed, the vaccination gun will not operate set to produce a full vaccination, and therefore no vaccine is wasted. When the doctor has a child wants to vaccinate with generally tender skin, he can do the Reduce the actuation pressure by setting the thumb screw 46 accordingly by that exerted by the spring 42

Reduce pressure . -_1J -

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Claims (1)

H UWO Pafsnfonwölte
Dr. Ing.H. Negendank Dipl. Ing. H. Hsuck
Dipl. Phys. W. Schmitz 8 Munich 15, Moeerf $ tr. 23 Tel. 5380586 Oscar Henry Banker Breezewood Drive Munich, August 19th, 69 Bay Village. Ohio 44140 USA (Attorney File H-826> Claims M _e J Fluid operated device marked. by a housing (10) which forms a cylinder (11), a working piston (12) in the cylinder (11), a stop connected to the piston (12), a trigger (31) which is attached to the housing (10) is pivotally mounted and cooperates with the stop to hold or release the stop, a source of gas under pressure connected by a passage to the cylinder (11), a valve (.22) in the passage that controls the gas flow controlled by this, .and by a device (52) actuated by gas under a predetermined pressure in the cylinder (11) for actuating the trigger (31) in order to release the trigger (31) and the piston (12), 009811/1020 -O- Device according to claim 1, characterized in that the stop a rod (28) connected to the piston (12) j, which extends through the housing (10) up to the Outside of the same extends, and that a radially attached ! arranged area on the rod (28) is provided, which with! * the trigger (31) interacts _o 3ο device according to claim 1, characterized. That. ".'..- ■■■ -" - ■■ j the device operated under a predetermined gas pressure device has a shut-off valve (52), and that one with the Piston (12) movable device for actuating the shut-off valve (52) is provided, through which the in the cylinder (11) the amount of gas under pressure is determined. 4. Device according to claim 1, characterized in that the by the gas under a predetermined pressure: actuated device has a plunger (47) in "the housing (10), which on one side the pressure of the gas in the housing (10 ) is exposed ^, that a pivotable. ^ mounted lock (39) presses against the other side of the plunger '(37); to hold this against the plunger (47), and that the trigger (31) in a position of the Lock (39) can be held, wherein the trigger (31) in the position in which it is held by the lock (39) forms a stop (36) against which the one connected to the piston (12) ^! Stop can press «, ■ '^;-' • 5ο device according to claim 4, characterized by an on-j '■' - ■ · I Direction (46) for setting the pressure with which the spring (42 ) presses against the lock (59), the unit pressure of the gas at which the lock (38) is adjustable. 009811M020 ■■■ "■ - - ■■. ■;" .- ■ '■■ .- ■'. '■■ - - ί actuated by the plunger (47) * .vir.d. ,. ! 6. Device according to claim 4, characterized .ge-kennzeichnai j that the spring (42) is a leaf spring that a plate (43) on the housing. (10) is attached to which the spring (4?) ' . ί is hooked at one end that aligns with one another. End openings in the hooked end (44) and in the plate (43) are _{provided, the opening provided in the plate:} (43) being provided with a thread, and that a thumb screw (46) is provided in the openings ; and presses against the spring (42) to the pressure of: adjusting spring (42) against the lock (39), said 'thumbscrew holds (46) and the spring (42) on the _disk% _ (43) . . _; ... ■ ■ I 7ο device according to claim!, Characterized in that a return spring (27) is provided in the cylinder (11), around the piston (12) and the rod (28) in the opposite one Direction to when actuated by the gas pressure to move, and that one provided on the trigger (31) The stop (37) can attack the rod (28), in order to move the piston (12) and the rod (28) to reverse the movement of the trigger (31) in this opposite direction, the lock (39) is reset will" Device according to claim 4, characterized in that operated by gas under a predetermined pressure Device has a shut-off valve (52) arranged in the tappet (47), and that one with the working; piston (12) movable device for actuating the down; " - 3 - '- ■ J- f / 1 0038tf / 1r020 Check valve (52) is provided by the amount of in the Cylinder (11) set pressurized fluid will. 9. Device according to claim 1, characterized in that means are provided between the housing (10) and the trigger (31) to control the movement of the trigger ν (31) to delay. 10. Device according to claim 1, characterized in that the Geliäuse (10) has a U-shaped retaining bracket (33), between the sides of the trigger (31) is pivotably arranged that a recess (65) in the next to one of the sides of the bracket (33) lying side of the trigger (31) is provided, in "which a ball (62) and a spring (63) are arranged, the spring (63) forming the ball (62) against one side of the U-shape Bracket and the trigger (31) presses against the other side of the U-shaped bracket, s ο that a frictional force is generated to brake the movement of the trigger against the Bü * rel (33). -A- 009811/1020