Breaking strength of hypodermic needles

Hegewald & Peschke with testing solution for medical technology manufacturer

Syringes are used in many medical fields. Their designs are correspondingly diverse. In addition to flexible syringes, rigid cannulas are used.

To enable the gentlest possible treatment of the patient, syringes have become finer and finer over the course of time. It is important that despite the fineness of the needle, a certain breaking strength is maintained. This breaking strength is defined in DIN EN ISO 9626.

The standard DIN EN ISO 9626 refers to bending-resistant cannula tubes made of stainless steel for the manufacture of medical devices. A hypodermic needle consists of a tube in different lengths and different inner and outer diameters and is bevelled and ground on one side. The breaking strength of hypodermic needles is determined according to the standard by means of a 2-point bending test. For the test on the stiffness of the cannula tube, a 3-point bending device is used. The bending distance is selected depending on the fineness of the needle.

A universal testing machine inspekt duo 10kN from Hegewald & Peschke is used for the test. The specimens are clamped with so-called pyramid jaws. The LabMaster testing software is available for carrying out and evaluating the test.