WO2003037409A1

WO2003037409A1 - Needle protection device for a syringe

Info

Publication number: WO2003037409A1
Application number: PCT/DE2002/003857
Authority: WO
Inventors: Abdolhamid Huschmand Nia
Original assignee: Georg-August-Universität Göttingen
Priority date: 2001-10-23
Filing date: 2002-10-14
Publication date: 2003-05-08
Also published as: DE20208394U1

Abstract

The invention relates to a needle protection device which is embodied as a clippable sliding element (7) which can be retrofitted for commercially available syringes (1). Said element can be laterally clipped onto the syringe cylinder in order to cover the needle (4) in a protective manner, and can be axially displaced on said cylinder, from its protective position in which it covers the needle (4) into a working position in which the needle (4) is released for insertion. The sliding element (7) comprises a hollow, conical end section (8) which surrounds the needle (4) when said element is clipped onto the needle in the protective position, and the end section, in turn, is provided with a longitudinal slit (9) for laterally inserting the needle (4) during the positioning of the needle protection device, and an opening (10) for the needle (4) in its cone tip. The sliding element (7) comprises a manually actuatable wheel drive (15, 16, 17), on its end located opposite the conical end section (8), for the axial displacement thereof.

Description

Needle protection device for a syringe

The invention relates to a needle protection device for the needle of a syringe for taking blood, an injection syringe or the like, which has a syringe cylinder equipped at one end with the needle to receive the blood to be drawn off or containing a spray liquid, in which a manually operated piston can be axially displaced is led.

Blood sampling, especially in critical situations, is associated with the risk of all persons involved injuring themselves after or during the withdrawal or while handling the blood collection set at the tip of the needle and possibly infecting it. Whether z. B. a pregnant woman is infected with hepatitis or HIV, is usually not known at the time of birth. Basically, all body fluids should therefore be treated as if the patient is infectious.

In order to largely rule out this risk of injury, a large number of proposals for syringes with a needle protection device have been developed. However, all these proposals have in common the disadvantage that they are special syringes with integrated needle protection, which are accordingly expensive.

The invention has for its object to develop a cheaper solution that offers comprehensive protection during syringe handling. Starting from the needle protection device described at the outset, this object is achieved according to the invention by the following features:

a) The needle protection device is designed as a component which can be retrofitted for commercially available syringes in the form of a clip slide, which can be clipped onto the side of the syringe barrel for protective covering of the needle and can be axially displaced from its protective position covering the needle into a working position releasing the needle for puncture ;

b) the clip slide has a hollow, in the clipped-on protective position surrounding the needle conical end portion, which for a lateral insertion of the needle when placing the needle guard with a longitudinal slot and in its cone tip with a

Passage for the needle is provided;

c) the cone-shaped end section is followed by a partially cylindrical clip part which has an inner partially cylindrical contact and sliding surface for the syringe cylinder and spring-elastic expandable brackets which partially grip the syringe cylinder when the clip slide is clipped on and represent guide elements in the axial displacement of the clip slide on the syringe cylinder ;

d) for this axial displacement, the clip slide at its end opposite the conical end section has a manually actuable wheel drive which can be rotated manually about a wheel axis lying transversely to the longitudinal axis and, when the clip slide is clipped on, with frictional engagement on the

The barrel of the syringe barrel is in contact. The needle protection device according to the invention is therefore suitable both for the withdrawal and for the injection of a liquid. The syringe can be placed in protected mode without the needle becoming non-sterile. In addition, the user is protected against accidental puncture injury during the handling of the syringe or third parties after removal or injection from a potentially infectious patient from contact with harmful liquid. It is even possible to manufacture the portion of the clip pusher surrounding the needle from a material that provides radiation protection if the syringe can be handled in conjunction with radioactive material.

The needle protection device according to the invention is not tied to a very specific syringe assembly. The majority of the cases occurring in practice can be covered with only two to three different sizes of needle protection device (based on the diameter and / or length of the syringe to be used).

Due to the lateral longitudinal slot provided in the conical end section of the clip slide, injuries can already be avoided when the two parts are assembled.

Overall, the concept according to the invention offers a universal, but nevertheless inexpensive needle protection device which can be used in a simple manner in normal removal and injection systems.

It is expedient if the wheel drive comprises two wheels which are arranged on the wheel axis with an axial spacing from one another and which preferably each have a plastic casing. This not only enables the clip slide to be moved continuously back and forth, but also to lock it in any position, caused by the adhesion of the wheel cover mentioned on the cylinder surface.

Further features of the invention are the subject of the dependent claims and are explained in connection with further advantages of the invention using an exemplary embodiment.

In the drawing, an exemplary embodiment of the invention is shown. Show it

Figure 1 is a perspective view of a syringe with a clipped-on needle, in the working position and here the needle for pricking the needle protection device;

Figure 2 shows the representation of Figure 1 in plan view;

Figure 3 shows the bottom view of the needle protection device according to

Figure 1 and

Figure 4 shows the placement of the needle guard on a

Syringe.

In particular, FIG. 4 shows a commercially available syringe 1 for taking blood or for an injection. The syringe comprises a syringe cylinder 2 which receives the blood to be aspirated or contains a spray liquid, which at one end merges into a slender cone extension 3 which carries a needle 4. In the syringe cylinder 2, a manually operable piston 5 is axially displaceably guided, which protrudes from the end of the syringe cylinder 2 opposite the needle 4 and is equipped with a pressure plate 6 at its free end. FIG. 3 shows a needle protection device which is designed as a component which can be retrofitted for commercially available syringes 1 in the form of a clip slide 7. This has a hollow conical end section 8 which surrounds the needle 4 when the clip slide 7 on the syringe 1 assumes its protective position. In order to be able to slide the clip slide 7 laterally onto a syringe 1 (see FIG. 4), the conical end section 8 has a longitudinal slot 9, which allows the needle 4 to pass into the interior of the conical end section 8 (as shown in FIG. 4) illustrated). The conical end section 8 has a passage opening 10 for the needle 4 in its cone tip (see also FIG. 2).

Connected to the conical end section 8 of the clip slide 7 is a partially cylindrical clip part 1 1, which has an inner partially cylindrical contact and sliding surface 1 2 for the syringe barrel 2, on the outer lateral surface of which the contact and sliding surface 1 2 is adapted in its curvature , The clip part 1 1 also has three spring-elastic spreadable bracket pairs 1 3, which partially grip around the syringe cylinder 2 when the clip slide 7 is clipped on (see in particular FIG. 2) and represent guide elements in the axial displacement of the clip slide 7 on the syringe cylinder 2. In the illustrated embodiment, the axial width b of the middle pair of brackets is only about half as large as that of the two outer bracket pairs.

At its end opposite the conical end section 8, the clip slide 7 has a manually actuable wheel drive for an axial displacement of the clip slide 7 on the syringe cylinder 2. This wheel drive comprises two axially spaced apart wheels 1 6 arranged on a wheel axis 1 5 lying transversely to the longitudinal axis 14, each of which is provided with a plastic sheath 17, which is frictionally engaged when the clip slide 7 is clipped onto the syringe cylinder 2 rest on the jacket of the syringe barrel 2 (see in particular FIG. 1).

On the clip slide 7, a locking device 1 8 is provided which, in cooperation with a counter element located on the syringe cylinder 2, fixes the clip slide 7 in its protective position surrounding the needle 4 on all sides. This lock can be a cam interacting with a recess or the like.

FIG. 4 shows how a commercially available syringe 1 is equipped with a clip slide 7 according to the invention. When the clip slide 7 is pushed on laterally, the needle 4 of the syringe 1 dips through the longitudinal slot 9 of the conical end section 8 into the inner cavity of this conical end section 8 and is then enclosed on all sides by the conical end section 8. The clip slide 7 is then fixed on the syringe barrel 2 by laterally pressing the two parts against one another, which leads to a spreading of the spring-elastic pairs of clips 1 3 of the clip slide 7, which can thus be clipped onto the syringe barrel 2, as a result of which the wheels 16 or their plastic -Sheath 1 7 come to rest on the outer surface of the syringe barrel 2. From this protective position, which surrounds the needle 4 on all sides, the clip slide 7 can be moved in the longitudinal direction into a working position by manually turning the wheels 16 on the syringe barrel 2. In this case, the needle 4 passes through the passage opening 10 of the conical end section 8 into a position which releases a puncture. This axial displacement of the needle protection device can be carried out by the person operating the syringe 1 with one hand, with the hand operating the piston 5 of the syringe 1 at the same time.

Claims

Expectations

1 . Needle protection device for the needle (4) of a syringe (1) for taking blood, an injection syringe or the like, which has a needle (4) at one end which contains the blood to be drawn off or contains a spray liquid

Syringe barrel (2), in which a manually operated piston (5) is guided axially displaceably, characterized by the following features:

a) The needle protection device is as for commercially available syringes

(1) retrofittable component in the form of a clip slide (7), which can be clipped onto the side of the syringe barrel (2) for protective covering of the needle (4) and on this from its protective position covering the needle (4) into a needle (4) the working position releasing the puncture is axially displaceable;

b) the clip slide (7) has a hollow, in the clipped-on protective position, the needle (4) enclosing conical end portion (8), for a lateral insertion of the

The needle (4) is provided with a longitudinal slit (9) when the needle protection device is attached and in its cone tip with a passage opening (10) for the needle (4);

c) to the conical end section (8) is a part-cylindrical clip part (1 1), which has an inner part-cylindrical contact and sliding surface (1 2) for the Has syringe barrel (2) and spring-elastic expandable bracket (13) which partially grip around the syringe barrel (2) when the clip slide (7) is clipped on and represent guide elements in the axial displacement of the clip slide (7) on the syringe barrel (2);

d) for this axial displacement, the clip slide (7) has, at its end opposite the conical end section (8), a wheel drive (15, 16, 17) which can be acted upon manually and which rotates about a wheel axis (15) transverse to the longitudinal axis (14) ) can be rotated manually and, when the clip slide (7) is clipped on, is in frictional engagement with the jacket of the syringe barrel (2).

2. Needle protection device according to claim 1, characterized by a on the clip slide (7) provided locking device (1 8) which, in cooperation with the syringe cylinder (2), fixes the clip slide (7) in its protective position.

3. Needle protection device according to claim 1 or 2, characterized in that the wheel drive (1 5, 1 6, 1 7) comprises two wheels (1 6) arranged on the wheel axis (15) with an axial spacing from one another.

4. Needle protection device according to claim 3, characterized in that each wheel (1 6) has a plastic sheath (1 7).

5. Needle protection device according to one of the preceding claims, characterized in that the clip slide (7) has three pairs of brackets (13) spaced apart from one another in the axial direction. Needle protection device according to claim 5, characterized in that the axial width (b) of the middle pair of brackets (13) is only about half as large as that of the two outer bracket pairs (13).