WO1989002285A1

WO1989002285A1 - Injection syringe/mixing system

Info

Publication number: WO1989002285A1
Application number: PCT/EP1988/000697
Authority: WO
Inventors: Mohandes Bader
Original assignee: Transcojekt Gmbh & Co. Kg
Priority date: 1987-09-10
Filing date: 1988-08-01
Publication date: 1989-03-23
Also published as: DE3730437A1

Abstract

An injection syringe (10) for administering and/or for mixing at least two different injection fluids generally has a cylinder (13) closed by a bottom (14) and containing a piston (12) movable by means of a pusher (11). In order to achieve a more simple design and a safer operation or action of the device, at least two connections (15', 15'', 17) are provided in the area of the bottom (14).

Description

Syringe / mixing system

Description :

The invention relates to a syringe according to the preamble of claim 1 or a mixing system according to the preamble of claim 14.

To administer medication, it is often necessary to deliver exactly adjustable amounts of a solution or mixture of solutions from a vessel or bag to a patient, for which purpose an administration or so-called perfusion syringe is used. In many cases, several liquids still have to be mixed together in order to apply them together. A conventional arrangement is shown in FIG. 1. Here, the perfusor syringe 1 10 is connected via a hose line 4 to an input of a T-piece 6, 5 on the one hand th whose two other fittings via further tubing 4 having therein check ^valves' to a container with a solution of 3 and on the other hand to the Patien¬ connected are. If no mixing of two liquids is to take place, the perfusion syringe 10 is empty at the beginning of the injection process (the plunger sits on the bottom of the syringe), if liquids are to be mixed, the perfusion syringe 10 can already be mixed with a certain amount of a first one Liquid 2 must be filled. The administration process is such that the operator first pulls the plunger of the perfusion syringe 10 out of the cylinder so that the liquid 3 flows through the check valve 5 in the direction of the arrow and enters the perfusion syringe 10 until it is sufficiently filled. The operator then presses the piston down, so that liquid contained in the perfusion syringe 10 is conveyed through the other check valve 5 to the patient 1 in the direction of the arrow.

This known arrangement is now very cumbersome to set up since a large number of hose connections have to be made. Due to the many hose connections, the operational reliability of the arrangement is further reduced, since each

Connection must be plugged in (or screwed) and this can cause leaks or the hose connection can even come loose. Especially if you want to mix two or more liquids, the arrangement becomes even more confusing and fragile. Furthermore, when several liquids are mixed, the problem arises that ⁽ in the arrangement shown in FIG. 1) the hose connection between the T-piece 6 and the perfusion syringe 10 is completely filled with the liquid 3 after it has been sucked in and only becomes in "the perfusion syringe 10 the desired one Mixture is located. When the syringe contents are applied, a certain amount of the pure liquid 3 is thus first applied.

Starting from the above-mentioned prior art, it is an object of the present invention to facilitate or improve the application of solutions or liquids by means of a syringe and to make them safer, in particular to improve the mixing of several liquids to be applied.

This object is achieved in a surprisingly simple manner by a syringe according to claim 1 or a mixing system according to claim 14. Because the syringe is provided with at least two connections, the structure when assembling the arrangement is made considerably easier and the number of connections required is reduced. The resulting structure is much clearer than before, in particular when a large number of different solutions or liquids have to be applied. Finally, the mixing of the liquids is significantly improved, since each liquid can be assigned a separate hose path into the interior of the syringe and thus the entire amount of liquid coming from the syringe contains the desired mixture. The syringe is however also suitable for bare administering a -medizinischen or parenteral solution and pre ^• geous.

Further features essential to the invention result from the subclaims and the following description of preferred embodiments of the invention, which are explained in more detail with reference to illustrations. Here shows :;

Figure 1 shows an arrangement according to the prior art.

Figure 2 shows a first preferred embodiment of the invention in partial longitudinal section and semi-schematic representation. 3 shows a partial longitudinal section of a syringe end piece according to a further preferred embodiment of the invention;

4 shows a partial longitudinal section through a further preferred embodiment of the invention, and

5 shows a longitudinal section through the bottom section of a further preferred embodiment of the invention.

In the preferred embodiment of the invention shown in FIG. 2, the perfusion syringe 10 comprises a plunger 11 which has a piston 12 at one end and a thumb grip ring 27 at its other end. The piston 12 sits tightly in a cylinder 13 which is closed at one end by a base 14 and at the other end

»Either has two spaced apart grip flanges 25 and 26 (Fig. 2 - left) or two finger grip rings 28 (Fig. 2 - right). ^" The grip flanges 25/26 are spaced so far apart (the opening of the grip ring 28 is so

^' large) that the operator can move the piston 12 with three fingers of one hand in both directions.

The bottom 14 of the perfusion syringe 10 is provided with at least two connecting pieces 15 ", 15", on the connecting nipple

«30 hose connections 4 can be plugged on. In the simplest embodiment shown in FIG. 2 (with only two connecting pieces), both are required, while in a further embodiment, not shown here, a large number of such connecting pieces are provided with nipples 30, which can be sealed or closed by means of end caps which hose connections can be plugged on as required.

One connection piece 15 ″ is connected to a patient 1 via a hose 4 with a check valve contained therein. The other connection piece 15 ′ is also connected Via a hose connection 4 and a check valve 5 with a container with a solution 3 in connection, the two check valves 5 being arranged opposite one another with respect to their passage direction. When the piston 12 is pulled out, liquid 3 is thus passed through the

Socket 15 'sucked in, when the piston 12 is pushed in, the liquid contained in the perfusion syringe 10 is supplied to the patient 1.

To add another liquid, e.g. B. to be able to easily mix a medication, in the preferred embodiment shown in FIG. 2 the check valve 5 leading to the liquid 3 is provided with a puncture nozzle 17 which is closed by a puncture seal 16 which is opened by means of an injection needle ( an injection syringe) can be pierced.

In the further preferred embodiment of the invention shown in FIG. 3, the puncture nozzle 17 is arranged to protrude either from the base 14 (axially) or from the cylinder 13 (radially). In the preferred embodiment shown in FIG. 4, the connector 17 is located in the transition area between the cylinder 13 and the base 14.

The connecting pieces are advantageously arranged such that their arrangement can be assigned to a determination. So z. For example, it is advantageous if the connector 15 "leading to the patient 1 is arranged either on its own (compared to a large number of connecting connectors 15 ') or centrally. Especially when a large number of connecting connectors are to be provided , it is advantageous to distribute them also on the cylinder 13 or the transition zone between cylinder 13 and base 14.

3 shows yet another advantage of arranging a puncture nozzle 17 directly on the body (bottom 14 or cylinder 13) of the perfusor syringe, which lies in the fact that when a cannula 7 is inserted, it projects directly into the interior of the perfusor syringe so that the injected liquid can mix directly with the syringe content (e.g. an infusion solution) and thereby desired concentration of injected medication and infusion solution is ensured.

5 shows a particularly important detail of the invention, which consists in the fact that the connecting pieces 15 'and 15 "contain the check valves. In the embodiment shown in FIG. 5, each of the two valves consists of a valve body 18 compliant material, which is pressed by a valve holder 19 onto a valve seat 20. The valve body 18 continues to be guided through a valve guide 21 in the valve housing 22. The entire valve arrangement opens outwards on the one hand via a connecting nipple 30 and on the other hand through a bore into the interior of the perfusor ¬ syringe and is inserted into a housing connection piece 29 integral with the housing base 14 and held therein by means of a union piece 23. In a further, particularly preferred variant, which is not shown in the drawing, the nipple 30 is in one piece with the union piece 23 trained.

This particularly preferred embodiment of the invention further simplifies the overall structure of the arrangement and considerably reduces the dead volume (in FIG. 1 the space between the check valves 5 and the perfusion syringe 10). The clarity is further increased if the nipples 30 (optionally together with the union pieces 23 and / or the valve housings 22) are made of different colored plastic depending on the direction of flow. A filter 24 is preferably arranged at least between the valve through which liquid can be expelled from the perfusion syringe and the interior of the perfusion syringe, by means of which it is ensured that no solids can reach the patient.

In a further preferred embodiment of the invention, which is not shown here in the drawing, the valves leading to the interior of the perfusion syringe are additionally or alternatively formed as shut-off valves, in particular when the perfusion syringe 10 is provided with more than two connecting pieces. through which different liquids can be sucked in.

5 The features described above can be combined over a wide range without departing from the inventive concept. The important point here is that the perfusion syringe is provided with a variety of connection options, so that the entire existing mixing system is simplified. 0

5

Q

5 Reference list

11 stamps

12 pistons

13 cylinders

14 bottom

15 connecting piece 16 puncture seal

17 puncture nozzles

18 valve body

19 valve holder

20 valve seat

21 valve guide

22 valve housing

23 union piece

24 filters / 26 handle flanges

27 thumb grip ring

28 finger grip ring

29 housing connection piece

30 connection nipples

Claims

Claims:

1. Syringe, in particular for mixing at least two different injection or similar liquids (2, 3) with a cylinder (13) closed off by a base (14), in which a piston (12) is held by a plunger (11). 5 is arranged such that it can be moved, characterized in that at least two connections (15 ', 15 ", 17) are provided in the region of the base (14).

T0 2. Syringe according to claim 1, characterized in that at least one of the connections is designed as a puncture nozzle (17), 70

a cannula (7) can be inserted through the puncture seal (16).

3. Syringe according to one of the preceding claims, characterized in that at least one of the connections (15 ¹ , 15 ", 17), preferably a stub (17), in the region of the transition between the cylinder (13) and the base (14) or is arranged on the cylinder (13).

10 4. Syringe according to one of the preceding claims, characterized in that at least one of the connections (15 ', 15 ") is provided with a check valve (18 to 23).

- ^{■ •} - 5. Syringe according to claim 4, characterized in that the Rückschlag¬ valve (18 - 23) sits in a housing nozzle (29) which is integrally formed with the bottom (14) '.

20 ^""' 6. Syringe according to claim 5, characterized in that the check valve (18-23) is held via a union piece (23) in the housing nozzle.

5 7. Syringe according to claim 6, characterized in that the union piece (23) has a connecting nipple (30) for attaching a hose (4) or the like.

30 8. Syringe according to one of claims 4 to 7, characterized in that two connecting pieces (15 ¹ , 15 ") are provided and are equipped with check valves (18-23), the flow directions of which are opposite one another.

35

9. Syringe according to one of the preceding claims, It is indicated that at least one of the connections (15 ', 15 ") can be shut off.

10. Syringe according to one of the preceding claims, characterized by the fact that at least one of the connections (15 *, 15 ", 17) is provided with a filter (24).

11. Syringe according to one of the preceding claims, characterized by the fact that the cylinder (13) and the plunger (11) are provided with handles (25-28) which are designed in such a way that the piston

(12) by the operator with one hand in the cylinder

(13) is movable in both directions.

12. Syringe according to claim 11, characterized by the fact that at least the handle (27) provided on the plunger (11) is designed as a ring (27).

13. Syringe according to one of claims 11 or 12, characterized by the fact that two cylinder elements (13) are provided on the cylinder (13) as a double flange (25, 26) or as a grip ring (28).

14. Mixing system for mixing at least two different injection liquids (2, 3) with a syringe with a cylinder (13) closed off by a base (14), in which a piston (12) can be moved via a plunger (11) is arranged, characterized by the fact that at least two connections (15 ', 15 ", 17) are provided in the region of the base (14), which can be connected to liquid containers and / or to an infions line via hose connections (4) . 1Z

15. Mixing system according to claim 14, characterized in that the hose connection (4) is a check valve. (5) and / or puncture socket (17) for tight insertion of a cannula (7).

16. Mixing system according to one of claims 14 or 15, characterized in that the hose connection (4) comprises a shut-off device.

17. Mixing system according to one of claims 14 to 16, characterized in that the syringe is designed according to one of claims 2 to 13.