DE2031841C - Injection syringe or the like - Google Patents

Description

The invention relates to a hypodermic syringe or the like with a piston movable in the axial direction in a cylinder and one with de ;;; Piston connectable piston rod, whereby the portion of the Ko! at least one rod in a connection un! a disconnected position brin ^ bares connecting ^{element 1} has and wherein the piston rod is provided with an actuator. which is suitable for bringing the connecting element into the desired one of its two solutions, according to main patent 2,024,117.

A syringe of this type is talked about the task of being easy and cheap to manufacture and the Mos. The possibility of offering the piston rod in any axial position of the piston within the Spn connect cylinder with this and desc; . to be able to solve. The syringe can therefore not only as an injection syringe, but also serve as a transport container.

In the embodiment of such a syringe described in the main patent, the pistons are rod on the one hand and the actuator for transferring the connecting elements in their locking or lost position on the other hand, two separate components that both outside of the syringe barrel are provided with handles and those due to the opposite Depending on the position of these two handles, it can already be seen from the outside whether the connection system / wipe The piston rod and piston are in the locked or 11 «release position. The operation of this conn system by means of the two handles such as also the actuation of the piston takes place by axial movement of the handle, which is an operation with comes towards only one hand.

The invention is based on the object of further simplifying a syringe according to the main patent in terms of construction and manufacturing costs in order to obtain a product that is as cheap as possible, but the condition that the piston rod is in every axial position of the piston within the cylinder should still be met should be separated from the piston or connected to it.

To solve this problem, it is proposed that the piston and the piston rod provided with a handle should be brought into or out of engagement with one another by a relative rotation between the two around the longitudinal axis of the cylinder have and that the handle located on the piston rod serves as the actuator.

In an advantageous embodiment, the piston has a diametrically extending slot in a wall facing the piston rod and extending transversely to the cylinder axis, and that on the wall facing the piston

At the end of the piston rod, a bolt that can be moved through this slot by its axial movement is attached is.

Another useful embodiment is that the two by relative rotation to each other in Engaging elements at the same time preventing each other from this relative rotation, optionally in or have disengageable locking elements. There is a particularly advantageous one Embodiment is that parallel to the piston rod axis ira piston on the one hand and on the bolt on the other hand, with the same center distance, a hole or a pin fitted to this hole are located, the mutual assignment of hole and pin is chosen so that both at a suction movement of the piston rod in engagement Piston after

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Another useful embodiment is that the piston rod is assigned at least one stop which is suitable for locking the rotation of the piston rod relative to the piston in one direction of rotation as soon as the elements which can be brought into or out of engagement are in their release position .ung be-Sch another advantageous embodiment end of ^the ^^ "^ ^ _oIbe ^S _{ns 12 e} , nschiebbar.

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- the rotation direction ram.

Direction of rotation at the front edge of the slot attached to a stop associated with the bolt is. which emerges in this direction of rotation in the form inclined ramp gradually tapering off

Finally, there is still a "ί ^^ design, then, that on both sides of this a bore is mounted in d.eser wall at equal WinkelabstandIvon.

Bcsonders sorteilhaft it is that the Ko b, n _as a hollow body is formed and the m the piston / ugeordnete part of Verbindungselemente_ a plate is formed, the associated by a piston rod opening in the elastic piston is einse.zbar and of harder matenal as this consists. The piston is preferably made of rubber. Polystyrene or polypropylene is preferred for the plate.

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^ ^at f stops 32 1 or 32 b is applied. In the -30 ^ ar1 dtn anscnug opposite

This situation ^ «» ⁿⁱ Kolbcnslanec 14 these can be removed from the £ ^^ 3 ™ _{with also from the} syringe _{cylinder The insertion of the plunger rod}

further advantage that no special seal is required and the piston is in a multiple shape

consequence.

Rotation between “ϊ in an axial

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1 sheet of drawings

Claims (8)

Patent claims: 1. Injection syringe or the like with a movable in a cylinder in the axial direction Piston and a piston rod connectable to the piston, wherein the for engagement in the Piston specific section of the piston rod at least one in a connecting and a Has separated position bringable connecting element and wherein the piston rod with a Actuator is provided that is suitable. the \ binding element to bring into the respectively desired of its two positions, according to Hauplpatent 2 024 117. characterized, that the piston (12) and the piston length (14), which is provided with a handle (22), are rotated relative to one another between the two in and out of engagement with one another about the longitudinal axis of the cylinder (10) have bringable elements (26, 30) and that as an actuator dk * on the KoIh: istange located Handle '.' serve ;. 2. Syringe according to claim I. characterized in that that the piston (12) in one of the piston rods (14) facing, extends across the cylinder axis extending wall has a diametrically extending slot (28) and that on the end of the piston rod facing your piston by its axial movement through it Slot movable latch (30) is attached. 3. A syringe according to one of claims 1 and 2, characterized in that the two elements (26, 30) which can be brought into engagement by relative rotation to each other at the same time prevent each other from this relative rotation, optionally engageable or disengageable locking elements (34 a. 34 b , 36). 4. Syringe according to claim 3, characterized in that parallel to the piston rod axis in the piston (12) on the one hand and on the bolt (30) on the other hand with the same center distance a bore (34 a. 34 b) or a pin fitted to this bore (36) are located, the mutual assignment of the bore and pin is selected so that both come into engagement when the piston rod (14) is sucked. 5. Syringe according to one of the preceding claims, characterized in that the piston rod (14) is assigned at least one stop (32 a, 32 b) which is suitable for locking the rotation of the piston rod relative to the piston (12) in one direction of rotation if the elements (26, 30) that can be brought into or out of engagement are in their release position. 6. Syringe according to one of claims 2 to 5, characterized in that in a certain Direction of rotation of the piston rod (14) relative to the piston (12) at the front in the direction of rotation located edge of the slot (28) a stop (32 a, 326) assigned to the bolt (30) is attached, which gradually runs in this direction of rotation in the form of an inclined ramp. 7. A syringe according to one of claims 2 to 6, characterized in that a bore (34 a, 34 b) is mounted in this wall on both sides of the slot at the same angular distance therefrom. 8. Syringe according to one of the preceding claims, characterized in that the piston (12) is designed as a hollow body ur.d the part of the connecting elements assigned to the piston is formed in a plate (26) which passes through an opening associated with the piston rod (24) can be inserted into the elastic piston and consists of a harder material than this.