DE20110521U1 - Safety syringe - Google Patents

Description

BOEHMERT & BOEHMERT

LAW FIRM

Bocnmcrt &. Bochmcit · N cnunnswug 131 · D-24105 Kiel

German Patent and Trademark Office Zweibrückenstr.

80297 Munich DR-ING. KARL BOEHMERI, PA (UW-1973) DIPL-INO ALBERTBOEHMERT.pa(IWMWi WILHELM JH STAHLBERO. RA. Bremen DR-ING WALTER HOORMANN. PA·. Bremen DIPL-PHYS. DR.HEINZGODDAR.PA·.Some DR-ING ROLAND LIESECANG. PAV Monks. WOLF-DIETER KUNTZE. KA. Breran. Alioru

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DR LUDWIG KOUKER. &bgr;&lgr;. Bremen DP. (CHEM I ANDREAS W1HK1.ER. pa·. B MICHAELA HUTH-DIERIG, RA. Mönchen DIPL-PHYS DR MARION 1ONHARDT, PA·. DR ANDREAS EBERT-WEIDENFELI.ER, RA. b DIPL-INO EVA UESEGANG, PA· Monks DR AXEL NORDEMANN. RA. BoIu. DIPL-PHYS. DR DOROTHEE WEBER-BRULS. PA·. Film* DIPL-PHYS. DR.STEFANSCHOiIE&Ggr;&Lgr;-.MONAo HR-ING. MATTHIAS PHIUPP.PA·.Diorfdd DR MARTIN WIRTZ, RA. Oo^-.ürf DR DETMAR SCHÄFER. «/·. Dm" DR !AN BERND NORDFWAiiN. Li..V...RA. B<Hi.i

PROF. DR WILHELM NORDEMANN, RA. BRB" DIPL-PHYS EDUARD BAUMANN.PA·. DR-ING.GERALD KLOPSCHPA·. DIPL-ING. HANS W. GROENING,PA·. DIPL-ING. SIEGFRIED SCHIRMER, PA·.Bielefeld DIPL-PHYS. LORENZ HANEWINKEL.PA · DIPL-ING. DR. JAN TONNIES, PA. RA. Kid DIPL-PHYS CHRISTIAN BIEHL, PA-. Kid DIPL-PHYS. DR-ING. UWE MANASSE,Pa· Bre DR CHRISTIAN CZYCHOWSKI. RA. Messenger DR. CARL- RICHARD HAARMANN. Attorney, DIPL-PHYS. DR.THOMAS L BITTNER, pa· Bali DR VOLKER SCHMITZ. Attorney, Mönchen DIPL-PHYS CHRISTIAN W. APPELT, pa·. DR. ANKE NORDEMANN-SCHIFFEL. Attorney". KERSTIN MAUCH . LLM, RA. Poutem DIPL.-BIOL· DR. JAN B. KRAUSS, PA. Moncfce, JÖRGEN ALBRECHT. RA. Manchen ANKE SIEBOLD, RA. Bra» DR. KLAUS &EEacgr;&Mgr; BROCKER, RA. Berlin ANDREAS DUSTMANN, LLM ..RA.Poudm, DIPL-ING. NILS T. F SCHMID, PA. Mtod»,

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S 5390 Kiel,

22 June 2001

Siekmann GmbH, Uferstr. 39, 24536 Neumünster

Safety syringe

The invention relates to a safety syringe according to the preamble of the main claim.

A safety syringe with the features of the preamble of the main claim is already known from the generic document DE 197 05 892 Cl.

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MUNICH - BREMEN - BERLIN - DÜSSELDORF ■ FRANKFURT - BIELEFELD - POTSDAM - BRANDENBURG - KIEL - PADERBORN - HOHENKJRCHEN - ALICANTE

http://www.boehmert.de e-mail: Dostmasterl2iboehmcrt.de

BOEHMERT & BOEHMERT
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With this safety syringe, the needle base is also held in the Luer cone at the tip of the cylinder and when the medication is dispensed, a head of the piston enters the needle base so that when the piston is pulled back again, the needle base is pulled into the cylinder of the syringe, where it remains as intended for the disposal of the used syringe, so that on the one hand the syringe cannot be reused, which would pose a considerable risk of infection, and on the other hand there is no risk of injury from the sharp needles when the syringe is disposed of.

In this way, it can be ensured that the risks of transmission of AIDS and other similar infectious diseases, which have recently arisen through used syringes, particularly in developing countries, can be significantly reduced.

In the case of the above-mentioned prior art device, it has been found to be disadvantageous that a resistance arises shortly before the pointed head enters the cannula base, which could cause the doctor not to administer the remaining medication or, in the event that he overcomes this resistance, a jolt occurs which causes pain to the patient.

According to the invention, this problem is solved by a device having the features of the main claim.

The proposed at least one or a plurality of spring tongues can be overcome more easily without the formation of resistance, so that the injection process does not have to be stopped before the entire medication has been dispensed.

BOEHMERT &*B0EHMERT

is broken and no jerk occurs that could be painful for the patient.

Further advantageous embodiments of the invention relate to the arrangement of the spring tongues, which ensure that the cannula is freely movable in the cylinder and is not located in the axial center and thus potentially re-extractable, but rather, unlike in Fig. 3 of the invention, rests with the tip against the cylinder wall, so that the tip is blocked when the piston is pushed forward again.

In order to completely prevent the syringe from being pushed forward again, the plunger is finally provided with a kink, which enables the treating physician to permanently render the syringe unusable by leaving the needle in the plunger.

Further advantages and features of the invention will become apparent from the following description of a preferred embodiment with reference to the accompanying drawing.

Fig. 1 the syringe with an enclosed needle already attached, but the needle guard is still on the needle and the medication has not yet been sucked in,

Fig. 2 the needle after injection without needle protection with plunger fully depressed,

Fig. 3 is a view of the syringe with the needle drawn into the plunger and through two positions of the rear plunger

BOEHMERT & BOEHMERT

section whose cancellation is shown,

Fig. 4 is a detailed view of the cannula base in section along the line A-A of Fig. 5,

Fig. 5 is a representation of the cannula base rotated by 90° compared to Fig. 4, in which the two webs for holding the socket can be seen, and

Fig. 6 is a cross-sectional view taken along line B-B in Fig. 5 of the spring tongue of the socket portion of the cannula base in a view from above.

The safety syringe shown in Fig. 1 has a cylinder 10 in which a piston 12 is slidably mounted. A cannula 16 provided with a cannula base 14 can be stored in the tip of the cylinder. A protective cover 18 is provided around the cannula, which must be removed before using the syringe. The piston 12 is provided with a piston head 20 which can enter the cannula base 14 to form a traction-mediated connection in order to draw the cannula base 14 from its seat in the tip of the cylinder into the cylinder together with the cannula when the piston is retracted.

In Fig. 2, the piston head can be seen which has entered the cannula base 14 and is locked behind two spring tongues 2 2 .

BOEHMERf &'ßOEHMER ^# t

Finally, in Fig. 3, the syringe is shown in a position in which the cannula 16 is retracted into the cylinder 10 and thus no longer represents a risk of injury. Advantageously, a free space is provided behind the spring tongues for the mushroom-shaped end 26 of the head of the piston.

The piston itself is provided with a cross-shaped cross-section, wherein a front end can be separated from the main part of the piston by a weakened point 28 in which the rear end of the piston is broken off after the piston is retracted, as shown in Fig. 3.

Finally, in Fig. 4, the cannula base 14 is shown in detail. The two spring tongues 22 can be clearly seen in section, which allow the mushroom-shaped head of the piston to move without resistance into a generously dimensioned free space 30, which is best seen in Fig. 5. Two webs 32, 34 carry the bushing part 36, which is designed as a ring on which the spring tongues project inwards and are formed in one piece with the ring, essentially parallel to the webs 22.

Finally, Fig. 6 shows a sectional view B-B showing an axial view from above of the spring tongues 22. The webs 32, 34 are shown in section. It can be clearly seen how an inner lumen between the spring tongues 22 is essentially round in order to make the support surface for the mushroom-shaped head as large as possible.

Claims (6)

1. Safety syringe with a cylinder ( 10 ), a piston ( 12 ) and a cannula ( 16) mounted on a cannula base (14 ) which can be retracted into the cylinder, the head of the piston ( 12 ) being designed to be mounted in the cannula base ( 14 ) to form a tension-promoting connection, and the cannula base ( 14 ) being held in a seat at the tip of the cylinder ( 10 ), characterized in that the cannula base ( 14 ) has at least one spring tongue ( 22 ). 2. Safety syringe according to claim 1, characterized by a bushing ( 36 ) on the cannula base ( 14 ) which carries the at least one spring tongue ( 22 ) and is connected to the cannula-carrying main section of the cannula base ( 14 ) via at least two axial webs ( 32 , 34 ). 3. Safety syringe according to one of the preceding claims, characterized by two spring tongues ( 22 , 22 ) which are arranged substantially parallel to the webs ( 34 , 34 ) in a free space left between them on the circumference of the bushing in the direction of the cannula and projecting obliquely inwards. 4. Safety syringe according to one of the preceding claims, characterized in that the spring tongue or tongues ( 22 ) have an inwardly inclined inner edge ( 38 ) which supports the piston tip after it has passed through and which narrows the lumen of the sleeve ( 36 ) while reducing it to a cross-section smaller than that of the piston head end. 5. Safety syringe according to one of the preceding claims, characterized in that the free end of the spring tongue(s) is spaced from the inner circumference of the seat of the cannula base ( 14 ) in the cylinder ( 10 ). 6. Safety syringe according to one of claims 4 and 5, characterized in that the inner edge ( 38 ) is concavely rounded corresponding to the substantially round shape of a mushroom-shaped end of the piston head.