DE1929317A1 - Syringes, in particular injection syringes for medical purposes, and associated, in particular exchangeable preparation containers - Google Patents

Description

Γ. i, ■ Dr. I ^

V " l. τ, κ r'-.

£ · ,. ^:> . .Schmitz

f- · T-.vlitr.23

Lothar Schwarz
dentist

75 Karlsruhe Munich, May 28, 1969

Belchenstr.flt (lawyer file M-694)

Syringes, in particular injection syringes for medical purposes Purposes and associated, in particular exchangeable, preparation containers

The invention relates to syringes, in particular injection syringes!

for medical purposes, and associated preparation containers, especially 1 specially designed as replaceable preparation cartridges j

can. ',

In known injection syringes, handling and keeping the hollow needle sterile are difficult. When the syringes are sterilized together with attached hollow needles, the needles can be easily bent or damaged. handling and storing such syringes is cumbersome. There has therefore often been a switch to injection needles or hollow needles to be used for single use only. Such single-use hollow

needles are delivered sterile packed in a thread holder, which are screwed onto a thread provided on the syringe can. The connection with the preparation container of the syringe is made in the usual way by the rear end of the needle pierces an elastic front end of the preparation container. Specimen containers are usually used in conjunction with disposable needles in the form of replaceable preparation cartridges that are thrown away with the needle after use. However, there remains the need to remove the needle from its packaging, screw it onto the syringe, and after use unscrew from the syringe again. This is still relatively cumbersome, and when unscrewing there is a risk of that the sterility of the needle is lost.

There are also known syringes that are used as a whole for only one time Intended for use. In these syringes, which are largely made of lightweight plastic, the needle is already firmly attached to the connected to the front end of the filled preparation container and surrounded by a sterility-ensuring hood, which immediately removed before use. The hood or some other packaging part can be used as an actuating piston and in addition serve, a closing the rear end of the preparation container Push the stopper forward to force the preparation out of the needle. However, such disposable syringes have under among other things, the disadvantage that they take up a relatively large amount of space for the needle and its protective hood when stored.

* ■ <Λ Α Λ Γ * * / "» Λ Λ »·

1923317

The invention is based on the task of the syringe and the associated To train preparation container so that the difficulties described with respect to the needle are overcome and the Syringe ready for use in the simplest possible way without endangering sterility can be made.

To solve the problem is used according to the invention Syringe, in particular injection syringe for medical purposes, with one for advancing a stopper in a preparation container, ter serving actuating piston, which is characterized by an independently of the actuating piston can be advanced parallel to this Auxiliary piston for pushing out a hollow needle held ready in the specimen container through the front closure of the specimen container, and an optionally releasable locking device for holding the hollow needle in the advanced position.

In the case of the syringe according to the invention, any handling of ' avoided the needle; instead, only parts that do not need to be sterile are handled to prepare the syringe. In addition, advancing the auxiliary piston is particularly simple and operation independent of manual dexterity.

In a further embodiment of the invention, the Arreitervorrich-i attack on the hollow needle or a part connected to it.

Another possibility, according to the invention, is that the locking device on the auxiliary piston or one connected to it

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Attacks part and locks the auxiliary piston in the advanced position. This option, which can also be used together with the locking mechanism on the hollow needle described first, offers the advantage that the preparation container and the associated ones Parts may have larger tolerances and can be constructed more simply.

It is also advantageous according to the invention if the locking device is designed to snap in, so that for the plague the needle in the advanced position no special manipulations are required. Preferably the locking device is optional solvable.

In a further embodiment of the invention, the auxiliary piston in the The actuating piston can be guided and actuated through a slot provided in the actuating piston. It is preferably the Auxiliary piston attached at its rear end to a block guided on the actuating piston. This construction is special simple and easy to use. You can according to the invention further be designed so that the locking device with each other has engageable locking elements which are provided on the block and a component resting with respect to the preparation container. In particular, it can advantageously be on the block at least one locking member that can be moved by hand in the release direction! be stored and biased in the blocking direction. This snaps in place complete advancement of the block and the auxiliary piston attached to it, the locking device automatically, whereby ι the advanced needle held in its position of use i-

will. ■!

00985 1/10 0 5

A syringe according to the invention, in which the preparation container as exchangeable preparation cartridge is formed, can be characterized in a further embodiment of the invention by a hinged and in the closed position lockable closure for receiving the preparation cartridge. Another advantageous design option consists in the fact that the closure has a foldable half, and that in the closure one with the preparation cartridge holding into engagement profiling is provided.

^v ■■ '. ■■■

In order to make the syringe also usable for sucking in preparations, it can be used in a further embodiment of the invention be characterized in that the actuating piston at the front end has a profile that locks with a corresponding profile when the stopper of the preparation cartridge is pushed forward of the plug of the preparation cartridge engages.

To solve the problem, the invention also uses a preparation container, in particular in the form of an exchangeable ^! Seibaren preparation cartridge, which has a closure that closes the front end of the preparation container and can be connected to a hollow needle and a stopper that closes the rear end of the preparation container and can be pushed into the preparation container, according to the invention, this preparation container is characterized for use in the syringe according to the invention that when the specimen container is still unused, the hollow needle inside the

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Preparation container is arranged to be advanced. This invention Feature is decisive for the important advantages achieved by the invention, that a special packaging and A special space requirement for the needle is eliminated and that no handling of the sterile one is necessary to prepare the syringe Needle are required.

In a further embodiment of the invention, it is expedient that To guide the hollow needle inside the preparation container, a stationary tube is provided which seals the stopper penetrated, wherein the stopper is displaceable on the tube, and that the rear end of the hollow needle in a the tube to the rear tightly closing, sealed in the pipe slidable stopper is mounted. With this construction one results particularly reliable guidance and sealing of the needle. It is useful that on the one adjacent to the front closure the front end of the tube and in the hollow needle close to the stopper openings are provided, which the interior of the tube with the inside of the preparation container or the inside of the hollow needle with the inside of the tube.

The tube is expediently in the front end of the preparation container anchored .. For lateral support of the pipe, it is useful that the pipe in the radial direction on the wall of the preparation container is supported.

00 9851/100 5

In order to facilitate the ejection of the needle, is in a further embodiment the invention conveniently the front end of the The hollow needle is mounted in a recess of the termination that is closed to the outside by an easily pierceable thin wall.

In order to also have the possibility, in a simple manner, of preparations to be drawn into the preparation container, in a further advantageous embodiment of the invention, the rear end of the preparation * the container's final push-in stopper protruding laterally, Have claw-shaped approaches that when advancing the plug by engaging the wall of the specimen chamber in an inward direction be held in the folded position. In this way, the claw-shaped approaches locking with a correspondingly profiled Actuation piston of the syringe cooperate.

The preparation container also preferably has a holder for it serving profiling, in particular from a circumferential direction :; extended groove may exist.

The invention is explained in more detail below with the aid of exemplary embodiments in conjunction with the drawings. It shows:

Pig. 1 is a schematic side view of a with a

replaceable preparation cartridge working inventively

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proper syringe with an advanced needle, roughly natural size,

2 shows an enlarged schematic sectional illustration of the front end of the syringe shown in Figure 1, but with the needle and actuator plunger shown in their retracted positions are,

3 likewise an enlarged schematic sectional illustration through the front end of the syringe, with the needle and actuator plunger up to are advanced to their respective end positions,

Fig. 4 shows a section along the line IV-IV of Fig. 1,

Fig. 5 is a schematic sectional view of the middle part of another embodiment of an inventive Syringe, and

Fig .6 is a schematic partial section through an ab-.

modified embodiment in which the locking ' device engages the hollow needle. !

009851/1005

The one in Pig. 1 syringe shown approximately natural size ar-:

j works in a known manner with a preparation container in the form of a! exchangeable preparation cartridge. Pure syringes with permanently attached Preparation containers, especially disposable syringes, apply the following; according to the explanations.

A cylinder 2 with elongated viewing openings 4 is provided, so that you can see the level the preparation cartridge 6 can be observed. In the position of use shown, a hollow needle 8 connected to the front end of the preparation cartridge 6 protrudes from one provided in the cylinder 2 their opening out. At its rear, open "end is the Zy-;

"i

linder 2 with pins 10 in a fork-shaped part 12 of a closure 14 mounted pivotably about a transverse axis. In the lock 14 is an actuating piston 16 displaceable with his thickened front end 18 can be inserted into the preparation cartridge 6; In Pig. 1 illustrated embodiment -is the actuation- Piston 16 provided with a longitudinal slot 20 extending from the front

End 18 extends from to the rear end of the actuating piston; which is anchored in a handle 22. At this point is. the Slot 20 is filled by a wedge 24. Also on lock 14 a handle 26 is provided.

FIG. 1 shows the position of use of the syringe in which the cylinder 2 is coaxial with the actuating piston 16, with the actuating piston partially pushed forward (to the right in FIG. 1).

009851/10 05

knows that the front end 18 of the actuating piston has pushed a stopper 28 originally located in the rear (left in FIG. 1) end of the preparation cartridge 6 forward so that a corresponding part of the preparation cartridge 6 has been emptied through the hollow needle 8 . Furthermore, a tube 30 can be seen in FIG. 1, which extends through the preparation cartridge 6. The actuating piston 16 has a longitudinal bore (not visible in FIG. 1) which "receives the tube 30 when the actuating piston 16 is advanced. As will be explained in more detail below, the tube 30 serves to receive the hollow needle 8 as long as the preparation cartridge is present 6. An auxiliary piston, not shown in FIG. 1, is used to push the hollow needle 8 into the position of use shown in FIG The block 32 is anchored, namely with the aid of a web 34 which engages from the block 32 through the slot 20 of the actuating piston 16. When the block 32 is completely displaced into the right-hand end position shown in FIG so that the auxiliary piston (not shown) and thus also the hollow needle 8 are locked in their position of use iff stepping locking elements, namely in the embodiment shown in = Fig.l two locking levers 36, which in the | Block 32 are rotatably mounted about pins 38 and have hook-shaped front ends 40, and a groove 42 engaging with these ends on the closure 14, which is a stationary component with respect to the preparation container 6. The rear ends the rest! levers 36 protrude from the block 32 and are attached to a handle plate 44 connected to the block by means of leaf springs. 46

resiliently supported; the leaf -9- ⁱ

009851/1005

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Feathers 46 thus serve to bias the locking lever into the in;

the locking position shown in Fig. 1, in the / block J52 with the ■

Terminal 14 is connected. It can be seen from Fig. 1 readily that the lock between the block j52 and the shutter 14 released i

when pulling back the block with your fingers the pushes the feeler lever 36 against the handle plate 44.

If a new preparation cartridge 6 is to be inserted, un-1

; he actuation of the locking lever 36 as well as the block 32 with the thereon |

Fixed auxiliary pistons (not shown in FIG. 1) as well the actuating piston 16 all the way back (infig. 1 to the left)

pushed. After all out of the shutter 14 in this way!

Before parts protruding into the cylinder 2 have been withdrawn, the cylinder 2 can be pivoted about the pins 10 by about 90 °

ground so that the rear open end of the cylinder 2 for the Ent-j lame boring introduction of a preparation cartridge 6 becomes accessible. In ■ Fig. 1 is indicated by dashed lines lying on the other side of the plane of the drawing boundary 48 of the fork-shaped part 12 of the closure 14; this limitation serves as a stop for cylinder 2 both in the ready-to-use position shown and in:

3 position swiveled by 90 °. A more detailed description of the pivoting process is dispensed with, as it is also done in the same way The known syringes are used.

? ig. Fig. 2 shows, on an enlarged scale, a longitudinal section through the Cylinder 2 after inserting a fresh preparation cartridge 6 and fold back the cylinder into the lock 14 and actuation olben l6 coaxial position of Fig, 1. In the example shown

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the cylindrical side wall 50 of the cartridge 6 goes forward into an annular one End wall 52 over which a central opening 54 for the passage the needle 8 has. The end wall 52 is shown in the -. set the operating position on a likewise annular end wall 56 of the cylinder 2, in which also a central opening is provided for the passage of the needle 8. At its rear end, the cartridge 6 is supported by a sleeve 60 which is resilient to the front (in Fig. 2 to the right) is biased, detected and pushed forward. The sleeve 60 has an inner projection 62, which with a Step 64 of the actuating piston 16 can engage so that by pulling back the actuating piston l6 against the sleeve 60 their biasing force can be pulled backwards until it no longer enters the cylinder 2 and the cylinder 2 thus around the Pins 10 can be pivoted. These details can also be found in known syringes.

The cartridge 6 is closed at its front end by a closure 66 made of elastomeric material, which rests against the end wall 52, and at the rear end by the already mentioned plug 28,

e. The tube 30, also already mentioned, is hung with his

End through the stopper 28. The stopper 28 can be displaced on the tube 30 in a sealed manner in the longitudinal direction. The front end of the pipe 30 has an opening 68 ″ immediately next to the front end 66. In the embodiment shown, the pipe j 30 continues in the end 66 in obliquely outwardly extending legs 70 J. As a result, the pipe 30 is supported on the end wall 52 from,

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so that a load on the pipe 30 in the longitudinal direction is not absorbed by the termination 66 but by the end wall 52. This is useful for the freedom of material selection.

Before the cartridge 6 is used, the hollow needle 8 is in the position shown in Fig. manner shown inside the tube j50, wherein they at their rear end of a lying inside the tube j50, the

Locking

Tube tightly closing / stopper 72 and carried and sealed at its front end by the closure 66. The conclusion 66 has zx this end a central recess 74 which is closed at the end by a thin wall 7.6. At its rear end, near the stopper 28, the needle 8 has an opening 78. Immediately before the syringe is used, the needle 8 is pushed out of the cartridge 6 through the thin wall 76. An auxiliary piston 80, which is guided in the actuating piston 16, serves this purpose. The actuating piston 16 has an axial bore 82 in which a spacer 84 is slidably mounted. The auxiliary piston 80 slides in a bore 86 of this spacer. The spacer 84 is prevented from falling out by a projection 88 on the front end of the actuating piston 16. In order to facilitate the introduction of the auxiliary piston 80 into the tube 3> 0, the tube 30 is provided with a funnel-shaped inner surface 90 at its rear end (on the left in the figures). The spacer 84 can be moved forwards (to the right in the figures) together with the pistons 16 and 80 until it touches the rear end of the tube 30. In this situation. the spacer 84 does not hinder the further movement of the pistons 16 and 80, since it is mounted so that it can move axially between these pistons.

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009851/100 5

When the auxiliary piston 80 is pushed forward (to the right in the figures) it enters through the funnel-shaped inner surface 90 in

Closure the tube 30 and pushes the stopper 72 together with the needle 8 To the right. The front end of the needle 8 penetrates the thin wall 76. The elastic closure 66 surrounds the needle in a sealing manner .

3 shows the position of the needle 8 at the end of the feed path of the auxiliary piston 80. The opening 78 is located at the rear end of the needle then approximately opposite the opening 68 at the front end of the tube 30. In this position, the auxiliary piston 80 is locked by the engagement of the block 28 on the closure 14 (see. Fig. 1). Then the hollow and slotted actuating piston 16 are advanced. He runs with radial play over the pipe 30 and pushes the plug 28 forward. This will remove the preparation from the cartridge pressed out, whereby it flows through the openings 68 and 78. In 1 Fig. 3 shows the possible end position of the actuating piston l6 * represents; the stopper 28 rests against the end 66 and the preparation cartridge 6 is practically completely emptied.

Fig. 4 shows in a schematic radial section the block 32 with ' the actuating piston 16 guided therein, the auxiliary piston 80 and the spacer 84 mounted in its axial bore 82 are. The auxiliary piston 80 is on the one guided across the Ebck 32 Web 34 attached. Furthermore, the locking levers 36, the grooves 94 serving to hold them and the + bearings are also shown in FIG. 4 pin 38 to be recognized.

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009851/1005 ~

192931

45 ι.

Pig. D explains another possible embodiment in which the: cylinder 2 for holding the preparation cartridge 6 only the beginning of the
Preparation cartridge encloses so that the front end of the preparation; cartridge is exposed. In this embodiment, part of the
ylinders 2 integrally into the closure l4. At its rear (left in the figure) end, the cartridge 6 has an outer ring ^; bead 96, which is in a corresponding annular groove 98 of the closure. 14 fits. This annular groove and the adjoining inner surface
of the cylinder 2 are lined with an elastomeric coating 100 and form a holding with the preparation cartridge 6 in a; handle stepping profiling. ,

I ι

The insertion of the cartridge 6 is in the embodiment of Figure 5; thereby made possible that the cylinder 2. one about an axis 102:

Has foldable half 104. In the shown closed

division, the foldable half 104 can be locked. As an example of a possible locking device, a locking ring 106 is shown in Fig. 5, which is axially screwed on a thread 108 bar. Of course, other locking devices can also be used. The handle 26 belonging to the closure 14 is here
provided on the locking ring 106. The locking ring 106 is after
secured by a spring ring 110 on the left.

Fig. 5 shows a further, independently usable feature,
which makes it possible to use the syringe not only for ejecting, but also for sucking in preparations. To this
The purpose of the stopper 28, which closes the rear end of the cartridge 6, is provided with a profile in the form of claw-shaped projections 112, which normally

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β "■ ■■ ~: ι

protrude obliquely outwards, as shown in the figure. The closure 14 has a corresponding annular recess 114 for the inclusion of the claw-shaped lugs 112. The claw-shaped lugs 112 are in the rest position (Pig. 5) so far outwards from that the front end 18 of the actuating piston 16 can be advanced to the rear end wall of the plug 28 unhindered

can. Behind the front end part 18 is the actuating piston 16 Profiling in the form of a

an annular groove 116 is provided which is large enough to receive the claw-shaped lugs 112 in a locking manner; When the actuating piston 16 is advanced forward (in the figure to the right). "He pushes the plug 28 forward. Here, the claw-like projections by the inclined inner surfaces 118 of the recess 114 and subsequently also by the engagement with the wall 50 are of The preparation cartridge 6 is pressed inwards so that it locks into the annular groove 116 of the actuating piston 16. The claw-shaped projections 112 remain in this locked section as long as the stopper 28 is inside the preparation cartridge 6. This results in that when the actuating piston 16 is withdrawn, the stopper 28 is also withdrawn, whereby a new filling can be sucked into the preparation cartridge 6. As soon as the stopper 28 has returned to the position shown in FIG Elasticity again out of the annular groove 116 and thus out of the path of the actuating piston 16.

In the case of syringes with a fixed, non-exchangeable preparation chamber the elimination of the structural details required for inserting and removing cartridges simplifications. _ 15 _

009851/1005

Figure 6 illustrates schematically a possible embodiment of a Locking device which engages the needle 8. The one in the pipe

J50 displaceably arranged hollow needle 8, which is fastened at its rear end in the sealing plug 72, has a locking groove in its rear end section which is delimited at the front by a steep shoulder 120 and at the rear by a conical surface 122. The hollow space 124 of the needle 8, indicated by dashed lines, preferably ends in front of the locking groove, as shown. A resilient detent pawl 126 is attached to the front end portion of the tube 50 by means of a ring 128. The front end of the detent pawl protrudes obliquely into the interior of the tube JO through an opening IJO. When the needle 8 is advanced, the front end of the detent pawl slides . 126 on the needle 8, until it finally snaps into the locking groove 120, 122 Thereafter, a return movement of the needle ■ no longer possible, the conical face 122 has the purpose of an overall \ know tolerance of the movement path of the needle or of the auxiliary piston;. ( not shown in Figure 6. When the needle is advanced a little beyond the locking point, the locking pawl 126 slides further on the conical surface, and then the needle can be moved back again until the locking pawl 126 engages the shoulder 120 In many cases, however, there is also a

be satisfactory in simple, tolerance-free 'engagement This can be, for example, a locking groove that is steeply delimited on both sides be used.

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/ S

It is clear that those in Pig. 6 shown or a similar locking device can also be constructed so that it does not acts directly on the needle, but on a part connected to it, for example the stopper 72.

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009851/1005

Claims (1)

Claims Γΐ. j Syringe, in particular injection syringe for medical purposes, with an actuating piston serving to advance a stopper in a preparation container, characterized by an auxiliary piston (8θ) which can be advanced independently of the actuating piston (16) and parallel to it for pushing out a hollow needle (8) held ready in the preparation container (6) ) through the front end (66) of the preparation container (6), and an optionally releasable locking device (56 to 46; 120, 126) for holding the hollow needle (8) in the advanced position. 2. Syringe according to claim 1, characterized in that the locking device (120,126) engages the hollow needle (8) or a part connected to it. 0 0 9 8 51/10 0 5 > .- Syringe according to claim 1 or 2, characterized in that the locking device (36 to 46) on the auxiliary piston (8o) or ■ engages an associated part and locks the auxiliary piston (8o) in the advanced position. 4. Syringe according to one of claims 1 to 3> characterized in that the locking device (36 to 46; 120, 126) is designed to be latching. 5. Syringe according to one of claims 1 to 4, characterized in that the locking device (36 to 46) is optionally releasable is". 6. Syringe according to one of claims 1 to 5 *, characterized in that the auxiliary piston (80) is guided in the actuating piston (l6) and through a slot provided in the actuation piston (20) can be actuated. 7. A syringe according to claim 6, characterized in that the Auxiliary piston (80) attached at its rear end to a block (32.) guided on the actuating piston (16) 8. Syringe according to Claims 3 and J, characterized in that the locking device (36 to 46) has locking elements (40, 42) which can be brought into engagement with one another and which are on the block (32). and a component resting with respect to the preparation container (6) are provided. - 2 - 009851/10 0 5 BAD ORiQtNAL 9 · Syringe according to claims 5 and 8, characterized in that; the locking device at least one mounted on the block (32), has latching member (36) which can be actuated by hand in the release direction and which is biased in the blocking direction. 10. Syringe according to one of claims 1 to 9, in which the prep [ rat container is designed as an exchangeable preparation cartridge, characterized by a hinged and closed; This position can be locked (ΐΛ) to accommodate the j Preparation cartridge (6). I. 11. A syringe according to claim 10, characterized in that the closure (14) has a hinged half (104), and that in the ^! Closure (14) holding one with the preparation cartridge (6) in Engaging profiling (98) is provided. 12. Syringe according to claim 10 or 11, characterized in that the actuating piston (l6) at the front end (l8) has a profile (116) which, when the stopper (28) of the preparation cartridge (6) is pushed forwards, locks with a corresponding Profiling (112) of the stopper (28) of the preparation cartridge (6) engages. 13. Preparation container, in particular exchangeable preparation cartridge for a syringe according to one of claims 1 to 12 / with a front end of the preparation container closing a hollow needle connectable termination and a rear one - 3 -009851/1005 End of the preparation container into the final. Preparation container advancable stopper, characterized in that when the specimen container (6) is not in use, the hollow needle (8) is arranged displaceably in the interior of the preparation container. 14. preparation container according to claim 13, dadurcbjgekisiert that for guiding the hollow needle (8) inside the preparation container (6) a stationary tube (30) is provided that carries the plug (28) penetrated in a sealed manner, the stopper (28) being displaceable on the tube (30), and that the rear end of the hollow needle (8) closes the tube (30) tightly towards the rear, sealed in the tube (30) slidable stopper (72) is mounted. Preparation container according to claim 14, characterized ^in: that on the provided adjacent front \ end of the tube (30) and in the hollow needle (8) close to the sealing plug (72) openings (68, 78) the front end (66), which the interior of the tube (30) with the interior of Präparatbehäl- \ ester (6) and the interior of the hollow needle (8) with the interior of! Connect the pipe (30). | 16. preparation container according to claim 14 or 15, characterized in that the tube (30) is anchored in the front end (66) of the preparation container (6). 009851/1005 17 · Preparation container according to one of "Claims 14 to 16, characterized characterized in that the tube (JO) in the radial direction on the Wall of the preparation container (6) is supported. 18. Preparation container according to one of claims 15 to 17, characterized in that the front end of the hollow needle (8) is mounted in a recess (74) of the closure (66) closed to the outside by an easily pierceable thin wall (76). 19. preparation container according to one of claims 15 to l8, characterized marked; that the the rear end of the preparation container (6) - final pushable plug (28) protruding laterally Has claw-en-shaped approaches (112), which when advancing of the stopper (28) by engagement with the wall (50) of the preparation container (6) be held in an inwardly folded position. 20. Preparation container according to one of claims 15 to 19. » through this characterized in that it has a profiling serving for its holder having. 21. Preparation container according to claim 20, characterized in that that the profiling extended from a circumferential direction Groove (42) consists. 00 9 851/10 05 2H Blank page