Abstract: An injection syringe comprises a tubular housing, a hollow plunger disposed for reciprocating displacements, partly in the housing, between an advanced and a retracted position, an elongated retraction member arranged for being moved from an advanced to a retracted position in relation to the plunger with at least a part of the retraction member placed inside the plunger, and a spring acting with a spring power between the plunger and the retraction member; a hypodermic needle, displaceable between a first position, wherein it is releasable mounted in the housing and a part of the needle is protruding from the housing, and a second position, wherein the needle is retracted into the housing or the plunger; a releasable retainer arrangement acting between the plunger and the retraction member for retaining the retraction member in its advanced position in relation to the plunger, a releasing mechanism for releasing the retainer when the plunger is in or close to its advanced position, and a coupling for connect

Abstract: A disposable injection syringe for allowing a comfortable injection at a low injury risk of the user. The syringe includes an injection needle, a tubular cylinder having a free opening at a first end, an end part with a through hole for slidably accommodating the injection needle at an opening of a second end of the tubular cylinder opposite the free opening, a piston reciprocally accommodated in the cylinder, a piston rod attached to the piston and extending into the cylinder through the free opening of the cylinder, a coupling for interlocking the piston and the injection needle at least in the reverse direction of the injection piston stroke. The coupling has two coupling parts, one of which is attached to the piston and the other of which is attached to the injection needle. The coupling parts are spaced from each other during at least part of the injection stroke and interlock during withdrawal.