DE9415349U1 - Device for the controlled absorption of a predetermined amount of liquid - Google Patents

Description

BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS

LAW FIRM

B & B, N u. P, Niemannsweg 133, D-24105 Kiel

German Patent Office Zweibrückenstr. 12

80297 Munich

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Your letter from DR.-ING. KABL BOEHMERT, PA(WH-i»n) DIPL.-ING. ALBERT BOEHMERT, PA (1954.1993) WILHELM JH STAHLBERG, RA, bremen DR.-ING. WALTER HOORMANN, PA*, bbemen DIPL.-PHYS. DR. HEINZ GODDAR, PA·, Munich DR.-ING. ROLAND LIESEGANG, PA·, Munich WOLF-DIETER KUNTZE, RA, Bremen DIPL.-PHYS. ROBERT MÜNZHUBER, PA <i965-i»2i DR. JUR. LUDWIG KOUKER ₁ RA, Bremen DR. (CHEM.) ANDREAS WINKLER, PA*, Bremen MICHAELA HUTH, RA, Bremen DIPL-PHYS. DR. MARION TONHARDT, PA*, düseeldokf DR. JUR ANDREAS EBERT-WEIDENFELLER, RA, Bremen DR. JUR. AXEL NORDEMANN, RA ₁ Bremen DIPL.-ING. DR. JUR. JAN TÖNNIES, PA, RA, kiel DIPL.-PHYS. CHRISTIAN BIEHL, PA, kiel DIPL.-ING. EVA LIESEGANG, PA Munich

PROE DR. JUR. WILHELM NORDEMANN, LAWYER", bejo

DR. LAWYER KAI VINCK, lawyer**, Berlin

PROF. DR. LAWYER PAUL W. HERTIN, LAWYER, Berlin

KLAUS VOM BROCKE, lawyer, Berlin

HERMANN-JOSEF OMSELS, lawyer, Berlin

HORST HUMMEL, LAWYER, Berlin

DR. LAWYER MONIKA PASETTI, ULM,, RA***, berlin

GABRIELE TTTZ, lawyer, Leipzig

PA - Patent Attorney RA - Attorney at Law * - European Patent Attorney ** - Notary public ·**- Attorney at Law (N.Y.)

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O 5013 Kiel 21.09.94

Andreas Ostwald, Schulterblatt 58c, 20357 Hamburg

Device for controlled recording
a predetermined amount of liquid

The invention relates to a device for the controlled absorption of a predetermined amount of liquid according to the preamble of the main claim, in particular a blood collection suction device.

It is known that hollow bodies that expand can partially suck back in flowable material that has escaped from their outlet openings. Everyone is familiar with this phenomenon from their toothpaste tubes.

1940

Bremen:

HoUerallee 32, D-28209 Bremen
PO Box 10 71 27, D-28071 Bremen

Telephone (04 21)3 40 90
Fax (04 21) 3 49 17 68
Telex 244 958 bopat d

Berlin:

Uhlandstrasse 173/174 D-10719 Berlin

Munich:

Franz-Joseph-Strasse D-80801 Munich

Leipzig:

Philipp-Rosenthal-Strasse 21
D-04103 Leipzig

Telephone (0 30) 8 81 10 36 . * "rtlejhon (0 8&bgr;*.34 50*8*0* * * * Jlejephon (03*4^) 9 60 29

fax
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(0 30) 8 81 39 27 183 661 fronod

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Dusseldorf.

Neßlerstrasse D-40593 Düsseldorf

Telephone (02 11) 71 89 Fax (02 11)7 18 27

Kiel:

Niemannsweg D-24105 Kiel Telephone (04 31) 8 40 Fax (04 31)8 40

BOEHMERT & BOEHMERT, NORDEMV&iN

The invention was based on the task of simplifying the practice of taking in liquids, which had previously been laborious and required the use of both hands, using piston syringes, so that it could be easily done with one hand. It is particularly desirable to have a second hand available to calm the patient with small children.

In particular, the disposable needles and syringes previously used for blood collection, from which the sample is transferred into sample containers, are to be simplified, especially with regard to safety for the treatment staff and the avoidance of handling errors, such as mix-ups and the like.

Since it is currently still often necessary to hold the syringe with one hand when taking a blood sample while pulling back the plunger with the other hand, the procedure for taking a blood sample is complicated. There are also additional equipment requirements for the cannulas, such as a bayonet lock on the needle on the syringe so that the needle is not left behind when the syringe is pulled back.

In addition, there is no guarantee that the needle will not be accidentally used twice by putting the needle back into the protective cap after it has been separated from the filled syringe, so that the needle appears to be in its original condition again.

Furthermore, sample mix-ups should be avoided at the stage of filling a blood sample into the sample container.

BOEHMERT & BOEHMERT, N0RDE1VPANN

It is also advantageous to take the blood sample initially at a low suction speed and then at a higher suction speed. This serves to first determine whether enough blood can be taken from a vein or the like, and if this is the case, i.e. if the tip is in the vein and not inserted too far or incorrectly in some other way, the main volume of blood can be taken.

It has also been shown that it is difficult to identify the opening of the cannula, i.e. the direction of the cut when pushing it out of a sterile package. However, since handling the cannulas and the syringe body does not require any special alignment, they are sometimes repositioned after the cannula protector has already been removed. This repositioning can lead to a person providing treatment pricking themselves with the needle or the needle becoming contaminated. This should therefore be avoided if possible.

It is also known that with bayonet closures, the moment a sharpened hollow needle is attached punctures the rubber membrane in a rotating motion, this can lead to an undesirable change in the angle of the needle, possibly even in the vein. This should also be avoided.

It is also known that some people bend a needle to make it easier to insert it. This is obviously dangerous as the needle can break and should be avoided by taking appropriate measures. Bending a needle also reduces the effective cross-section of the needle and is therefore not permitted.

BOEHMERT & BOEHMERT, NORDPMANNl^*

According to the invention, problems occurring during blood collection are solved by a suction device having the features of the main claim.

The subclaims reflect advantageous embodiments of the invention. It is particularly advantageous to keep the hollow body stable in its state with increased volume by means of foldable base parts, so that no more liquid escapes from the hollow body due to its internal pressure when the pressure on the narrow sides decreases. Because the corners of the base are made thin, they are more elastic, so that no breaks occur due to material fatigue.

The blood taken from a patient no longer needs to be transferred, but can be sent to a laboratory, possibly with the attached needle covered by a protective cap. In this laboratory, the needles can then be professionally separated from the blood sample containers (if necessary by machine) and disposed of properly.

The design of part of the narrow side with a strong radius of curvature makes it easier to press in the hollow body, without it tipping over if the fingers slip.

When using the device according to the invention as a blood collection suction device, a rubber valve closure can be provided in the fluid intake opening for attaching a cannula, which is pierced by a double needle that is placed on the hollow body shortly before the blood is taken. The needle is advantageously slightly eccentric and at an angle to the axis of the blood collection

BOEHMERT & BOEHMERT, NORTOEMAISSN: urfo'

device is designed so that it can be inserted as parallel as possible to the skin and the vein.

In order to avoid the problems with a removable cannula protector, which has to be carefully repositioned with the sharp needle in order to avoid injury, it is proposed to provide a sliding cannula protector, which in an advantageous embodiment of the invention also extends beyond a narrow neck of the hollow body when pushed towards the hollow body.

Further features and advantages of the invention will become clear in the following description of a preferred embodiment based on the accompanying drawings. Here:

Fig. 1 the device according to the invention in the flat state with a separately provided needle, and

Fig. 2 shows the device according to the invention in the state in which it is filled.

The device shown in Fig. 1 is advantageously designed with a slightly matte finish on its outside, so that it can be labeled. Prefabricated fields 3 0 can also be provided for the application of certain patient data.

The device shown in Fig. 1 consists essentially of the hollow body 12 on which the fields 30 for labeling are arranged. The narrow sides 14 and 16 are only indicated at the sides.

BOEHMERT & BOEHMERT, N0REiEMA ^: NN: urirfPARTNER.

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Floor segments 18 and 20 lie flat against each other as circular segments, whereby the common secant forms the end line 40.

A valve closure 22 is provided in the liquid intake opening 10 to prevent blood in the device from flowing out once it has been sucked in.

In Fig. 2, the device according to the invention is shown in its second stable state with an increased volume. It is held permanently in this state because the base segments 18, 20 now enable the hollow body 12 to remain stable with its increased volume without requiring external pressure on the narrow sides. The base segments designed as circular segments, which in the state with an increased volume form a curved base surface that has a shape similar to a convex lens in cross section, end in ends 42 in which they form a corner with the remaining wall area of the hollow body, which is exposed to relatively strong buckling loads. Instead of reinforcing this corner, it has been shown that a thinner design contributes to greater elasticity and is therefore more durable.

The base segments themselves are made thicker than the other wall areas in order to be able to better achieve their stabilizing effect. On the lateral middle sections of the hollow body, the hollow body is not designed to be relatively flat as in the other areas, but rather to be given a larger radius of curvature so that there is a larger pressure surface for fingers and they can more easily convert the hollow body into its second shape.

BOEHMERT & BOEHMERT ₅ NORELEMANJN: u^'PÄ

In the front area of the hollow body, i.e. in the area of the liquid intake opening 10, a valve closure 22 is provided which can be passed through with a needle and which is provided on its outside for clamping a needle/needle protection unit.

The needle 34 of this unit, which is advantageously attached eccentrically and at an angle, is designed as a double needle so that it can pierce the valve closure 22 of the hollow body with its rear pointed end. If this is achieved, a needle guard 36 can be pushed back over the clamping device and possibly also over the thin neck of the hollow body to release the front tip of the needle 34 for use. After use, the needle guard 36 can be pushed back again so that further injury with the needle 34 is effectively excluded. This valve guard can remain in place for a longer period of time; according to the invention, this should be until the needle can be properly disposed of and there is no longer any risk of it being used again for blood collection because used and unused needles are handled at the same time.

Claims (8)

BOEHMERT & BOEHMERT, NORIXEMÄNN üMJ PARTNER O 5013 CLAIMS 1. Device for controlled intake of a certain amount of liquid, marked by an at least partially elastic hollow body (12) provided with a liquid receiving opening (10), which can be permanently temporarily converted from a flat state into a further stable state with an increased volume by pressure on its narrow sides (14, 16). 2. Device according to claim 1, characterized in that the hollow body (12) is provided with crescent-shaped foldable base segments (18, 20) connected to one another at their semicircular edges, which in the flat state abut against one another with their inner sides and in the narrow-side loaded state form a base surface resembling a cross-section of a convex lens. 3. Device according to one of the preceding claims, characterized in that the material of the elastic * ? ARTNER*&Ggr; BOEHMERT & BOEHMERT, NORÖEMANN* <ä?d BARTNER*&Ggr; astic hollow body (12) is thinner in the pointed ends, the corners (42) of the bottom of the hollow body than in the remaining wall areas. 4. Device according to one of the preceding claims, characterized in that the material thickness of the crescent-shaped base segments (18, 20) is greater than the remaining material of the hollow body (12). 5. Device according to one of the preceding claims, characterized in that the narrow sides (14, 16) are provided with a larger radius of curvature at the beginning of a straight middle section, so that pressure can be applied to the narrow sides more easily. 6. Blood collection suction device with the features of one or more of the preceding claims, characterized by a valve closure (22) in the liquid receiving opening (10) that can be passed through with a needle. 7. Blood collection suction device according to claim 6, characterized in that a removable needle tip (32) which can be clamped onto the liquid receiving opening and has an eccentrically inclined needle (34) is provided. 8. Blood collection suction device according to claim 6 and 7, characterized in that a needle (34) is attached to the BOEHMERT & BOEHMERT, NORTH AMERICA: The blood collection suction device is provided with a retractable needle guard (36) which releases the needle (34) for use and can be pushed onto the blood collection suction device via the clamping device of the needle and the narrow neck of the hollow body.