WO2001010486A1

WO2001010486A1 - Device for extracting a liquid from a container in sterile conditions

Info

Publication number: WO2001010486A1
Application number: PCT/DE2000/002660
Authority: WO
Inventors: Roland Gerlach; Jürgen Reuter; Peter Heise
Original assignee: Caremed Medical Produkte Ag
Priority date: 1999-08-04
Filing date: 2000-08-04
Publication date: 2001-02-15
Also published as: DE29913550U1

Abstract

The invention relates to a device for extracting a liquid from a container, especially a medical container, in sterile conditions. Said device is composed of a needle comprising a flow channel for the liquid and a liquid filter for filtering the extracted liquid. Said liquid filter (89 is placed in the channel at an angle ( alpha ) comprised between 3 and 10 degrees, preferably 6 degrees, in relation to the longitudinal axis of the channel (6). In addition, the liquid filter (8) is located in a filter chamber (7) inside the channel (6), whereby the longitudinal axis of said filter chamber (7) extends along the longitudinal axis of the channel (6).

Description

description

Removal device for the sterile removal of a liquid from a container

Technical field

The invention relates to a removal device for the sterile removal of a liquid from a container, in particular for the removal of liquids from medical containers by means of syringes or infusion devices, according to the preamble of claim 1.

Devices of this type are used in particular to protect the patient from bacterial contamination.

State of the art

DE 3820204 AI describes a device for the filtered supply or removal of liquids into or from a container, in particular a bottle, in which separate chambers for the liquid channel and the air channel are arranged in a carrier plate, each containing filter elements. The device has the disadvantage of complicated manufacture and handling. In addition, there is a higher flow resistance, which requires a long period of time for removing the media.

DE 4010202 AI describes an extraction spike which has an extraction channel and an air channel for pressure equalization. The air duct is connected to the atmosphere by an air filter on the side. Compared to the piercing mandrel, the removal spike is provided with a cone for attaching a syringe, for example, and a Luer lock attachment for holding the syringe. This removal spike has the disadvantage that the removal material can only be removed unfiltered. This means a risk of infection for the patient, since any particles and germs are not filtered out.

Presentation of the invention

The invention is based on the object of specifying a removal device for the sterile removal of liquids from a container of the type mentioned at the outset which, with little technical effort, ensures flow-efficient filtering of the removed liquid and a compact and material-saving design.

The invention solves the problem by the features mentioned in the characterizing part of claim 1. Advantageous developments of the invention are characterized in the subclaims and are described in more detail below together with the description of the preferred embodiment of the invention, including the drawing.

The essence of the invention consists in that a liquid filter with an angle α to the longitudinal axis of the channel is arranged in the channel in the piercing mandrel through which the liquid to be removed flows. The angle is in the range between 3 to 10 degrees, preferably 6 degrees.

In particular in the embodiment according to claim 2, a favorable flow rate is thus achieved and there are no dead water areas in the filter chamber in which vortices can form. In a known manner, pressure equalization between the atmosphere and the interior of the container is ensured via an air duct with an air filter in the spike during the removal of the liquid.

For better handling of the removal device, it has proven to be advantageous to provide a handle plate in the central region which is provided with transverse ribs arranged on the surface.

At the end of the removal device, which lies opposite the piercing mandrel, an extraction cone is advantageously provided, in which, for example, a syringe cone engages.

A luer lock attachment known per se can advantageously be provided coaxially with the removal cone. The Luer lock approach is advantageously arranged coaxially with the removal cone.

To protect the combination of the extraction cone and Luer lock attachment against contamination during the period of non-use, it is advantageous to provide elastic protective sleeves or cover caps. It is advantageous that the protective sleeve has openings around the Luer lock attachment through which liquid can escape if necessary.

Instead of the removal cone or the Luer lock attachment, another technologically suitable connection attachment can also be provided.

The advantages of the invention are in particular:

With regard to hygiene, the entire compact design of the removal device and thus also the patient three different types protected against bacterial contamination:

no dead water areas in front of and behind the liquid filter, in which increased bacterial growth can occur during the withdrawal and service life;

Protection of the extraction cone and the Luer lock attachment against contamination by the elastic cuff during use and the cover cap during downtimes;

Drainage of the elastic cuff in the event of accidental overflow of liquid residues via the breakthroughs, which can lead to increased bacterial growth if the liquid accumulates. Good ventilation and drying of the entire interior (no damp chamber).

The following advantages should be emphasized with regard to handling:

small filter and thus compact design, since flow resistances are low;

ergonomic design for safe handling with non-slip cross ribs;

Possibility of integrating the bacteria-proof air filter into the handle geometry;

- One-hand operation of the cover cap.

The invention is explained in more detail below using an exemplary embodiment. The removal device according to the invention is applied to a removal spike for medical fluids. Figure 1 shows a container with the liquid to be removed and an attached removal spike according to the invention in section.

FIG. 2 shows an enlarged section from FIG. 1 in the area of the filter chamber.

FIG. 3a shows an enlarged section from FIG. 1 in the region of the removal cone.

FIG. 3b shows an enlarged section from FIG. 1 in the area of the Luer lock attachment.

FIG. 1 shows the exemplary removal device for the liquid transport from a container 4 (bottle, bag, Blasco) to a removal cone 5, from which the liquid can be removed using a syringe (not shown) or an infusion device (also not shown). A corresponding syringe attachment 18 is indicated in FIGS. 3a and 3b.

The removal device essentially consists of a piercing mandrel 1 with a channel 6, a filter chamber 7 and a liquid filter 8.

During the removal, the liquid flows through the channel 6 into a first half of the filter chamber 7, flows through the liquid filter 8, passes into a second half of the filter chamber 8 and finally flows into the removal cone 5. The liquid filter 8 in the filter chamber 7 is opposite the longitudinal axis of the channel 6 arranged at an angle. The inclination of the angle is 6 degrees in the exemplary embodiment. This relatively slight inclination of the liquid filter 8 has the advantage over horizontally or vertically installed filters that the flow undergoes almost no redirection and thus no stagnation and vortex areas, also known as so-called dead water areas, occur in which suspended particles can be deposited. At the same time, a long residence time of the infusion or injection liquid in the filter chamber 7 is avoided, which would promote a rapid multiplication of any bacteria that may be present. In addition, the minimal deflection of the liquid flow causes low resistances, which enables the user to remove it more easily.

FIG. 2 shows an enlarged section from FIG. 1 with direction lines which indicate the direction of flow of the liquid removed. It is obvious that the liquid flows through the filter chamber 7 relatively freely without the formation of dead water areas.

To ensure pressure equalization during the removal of the liquid, filtered air flows into the container 4 in a known manner via an air filter 10 known per se and an air duct 11.

For better handling, the

Removal device, here combined with a cover of the filter chamber 7, a handle plate 2 arranged, which is provided with superimposed transverse ribs. The user can put his thumb on the grip plate 2 and thus has a good grip when

Inserting the removal device into the container 4.

A known Luer lock attachment 12 is arranged coaxially with the removal cone 5. This ensures an exact coupling of the removal device with the respective attachment devices, e.g. guaranteed a syringe.

For the intended use of the medical fluid dispenser, the guarantee of Cleanliness is paramount. For this purpose, the Luer lock attachment 12 is surrounded by a rubber-elastic protective dome 13.

When the removal device is not in use, when no syringe is coupled, the protective dome 13 stretches automatically due to its rubber-elastic forces, so that contamination of the Luer lock attachment 12 is not possible from the outside (FIG. 1).

Furthermore, a cover cap 3 is provided in the example, which is connected to the protective dome 13 via an elastic web 16. The cover cap 3 has a peripheral edge 14 and a truncated cone 15. This cover cap 3, in combination with the protective dome 13, advantageously enables the entire combination of Luer lock attachment 12 and removal cone 5 to be covered. The truncated cone 15 engages sealingly in the removal cone 5 and the peripheral edge 14 simultaneously overlaps the Luer lock attachment 12. When the protective cap is put on, the protective dome 13 is compressed, as is done in a similar way in FIG. 3b by a syringe cone 18.

In the bottom of the protective dome 13, openings 17 are provided all around, which enable any liquids that may occur to be drained and thus prevent increased bacterial growth in a moist chamber. This minimizes possible bacterial contamination.

As shown in FIG. 3a, when a liquid is removed from the container 4 (e.g. with a syringe) and the cap 3 is open, a syringe cone 18 is inserted into the removal cone 5 of the removal device. The

Protection dome 13 is relaxed at this time. If a lock 19 of the Luer lock attachment 12 is used, the rubber-elastic protective dome 13 is deformed and releases the Luer lock attachment 12 of the removal device. After the liquid has been withdrawn and the Luer lock attachment 12 has been unlocked, the relaxed state according to FIG. 1 is automatically restored. The Luer lock attachment 12 and the removal cone 5 are protected against contamination from the outside. To further protect the removal device, the cover cap 3 is closed manually.

List of the reference symbols used

1 spike 2 handle plate 3 cover cap 4 container 5 extraction cone 6 channel 7 filter chamber 8 liquid filter 9 10 air filter

11 Air duct 12 Luer lock attachment

13 protective pin 14 edge

15 truncated cone 16 bridge

17 breakthrough 18 syringe cone

19 Lock 20

21 22

23 24

25 26

27 28

Claims

Expectations

1. Removal device for the sterile removal of a liquid from a container, in particular from medical containers, with a piercing mandrel in which a channel for draining off the liquid is present, and a liquid filter for filtering the removed liquid, characterized in that the liquid filter (8) is arranged within the channel (6) at an angle (α) to the longitudinal axis of the channel (6) between 3 to 10 degrees, preferably 6 degrees.

2. Removal device according to claim 1, characterized in that the liquid filter (8) within the channel (6) in a filter chamber (7) is arranged, wherein the longitudinal axis of the filter chamber (7) lies in the longitudinal axis of the channel (6).

3. Removal device according to claim 1 or 2, characterized in that a removal cone (5) is present at the end of the removal device, which is opposite the piercing mandrel (1).

4. Removal device according to claim 1 or 2, characterized in that at the end of the removal device, which is opposite the piercing mandrel (1), a Luer lock attachment (12) is present.

5. Removal device according to claim 4, characterized in that an elastic sleeve is present on the Luer lock attachment (12), which preferably has openings

(17) for the escape of liquid.

6. Removal device according to claim 3 and 5, characterized in that the Luer lock extension (12) is arranged coaxially to the removal cone (5). Extraction device according to claim 3 or 6, characterized in that a cover cap (3) is present which has an edge (14) and a truncated cone (15), such that when the cover cap (3) is used, the truncated cone (15) seals in the Removal cone (5) engages and the edge (14) fits over the Luer lock projection (12), the cover cap (3) being preferably elastically connected to the protective dome (13).

Removal device according to one of claims 1 to 7, characterized in that a handle plate (2), in particular with transverse ribs, is present parallel to the longitudinal axis of the piercing mandrel (1).