Syringe including different materials

Abstract

A syringe includes a syringe body, a syringe cone having a distal opening, and a connection arranged in the region of the syringe cone, wherein the syringe body includes a first material and the connection includes a second material, and wherein the first material is different from the second material and the second material is a softer material than the first material.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The invention relates to syringes, and in particular, syringes having a syringe body, a syringe cone including a distal opening, and a connection arranged in the region of the syringe cone.2. Description of the Related Art[0002]Syringes have become known from a multitude of patents that have a connection for various connectors that are mounted manually onto the tip of the syringe.[0003]A syringe of this type is described, for example in US 2013 / 079 276 A. A syringe body has become known from US 2013 / 079 276 A wherein a transport cap, an intravenous port or an injection needle can be screwed into a thread above the syringe cone. If, for example a transport cap is screwed into the thread, the syringe cone can be protected.[0004]A syringe with a thread in the region of the Luer-Lock connection has become known from DE 202 158 07 U1, wherein the thread is part of the syringe body. The Luer-Lock connection according to DE 202 158 ...

AI Technical Summary

Benefits of technology

The patent text describes a syringe design that uses a softer material to connect the syringe body to a threaded connector or adaptor. This softer material absorbs stresses and load peaks that might occur during the connection process, preventing them from affecting the syringe body. The use of a soft plastic material compensates for various stress situations. The syringe body itself is made of a hard material, but the connection between the two is made with a softer material to prevent crack formation. The patent also discusses a manufacturing method that involves producing the entire component using multicomponent injection molding, which allows for cost-effective production and lower positional tolerances. The softer material can be sprayed onto the hard material or vice versa, resulting in a physical connection between the two materials. It is important to ensure that the attachment surface has a large surface contact to ensure the stability of the connection.

Problems solved by technology

When using COC or COP as the material for the syringe cylinder, the problem arises that due to mechanical stresses between the connection or respectively the thread and the mating thread that is allocated to the connector, cracks can occur in the material of the syringe body, thereby compromising the functionality of the syringe.

In the worst-case scenario such mechanical stresses result in damage of the syringe itself or in leakage of same.

In all arrangements according to the current state of the art it was disadvantageous that the connecting piece, for example the thread of the Luer-Lock was of the same material as the syringe itself.

This resulted in that, due to mechanical stresses between the connection or respectively the thread and the mating thread that is allocated to the connector, cracks occurred in the material of the syringe body, thereby compromising the functionality of the syringe.

In the worst-case scenario such mechanical stresses can result in damage of the syringe itself or in leakage of same.

If—in order to avoid the problem of cracking—the entire syringe body consists of a softer plastic material, the problem arises that on the one hand a polypropylene (PP) syringe body due to its material properties can indeed compensate for the stresses caused by the connectors; however, a pharmaceutical medium cannot be stored over several months in a polypropylene (PP) syringe body due to the diffusion characteristics.

An additional problem consists in that connectors that, for example are to be screwed into the thread of the Luer-Lock include a multitude of different materials such as PC, PVC, polyethylene (PE) that will connect with the material of the Luer-Lock thread.

An additional problem of the current connectors is that they are generally screwed manually into the thread and that the insertion torque can fluctuate over a wide range, for example 12 Ncm to 56 Ncm, preferably 12 Ncm to 80 Ncm.

These stresses result in cracks on either the thread or on the connector.

At worst, breaks can even occur due to these stresses.

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