Patent ID: 7909796
Filing Date: 2011-03-22
Classification: A61M

Abstract:
1. An injection device for a syringe, having a syringe body, a cannula with a needle, and a plunger with a plunger rod, and having at least one actuating element ( 120 , 220 , 320 ) for converting the actuating work, to be performed manually by the patient, into a displacement of the syringe body ( 101 , 201 , 301 ) during an insertion stroke (H 1 ) and a return stroke (H 3 ), and into a displacement of the plunger rod during an injection stroke (H 2 ), with a guide device in which the syringe body ( 101 , 201 , 301 ) is mounted, and with a ram ( 150 , 250 , 350 ) which can be displaced against this in order to displace the plunger rod, and wherein the actuating work, by means of a single, targeted linear movement of the actuating element ( 120 , 220 , 320 ), is converted into the insertion stroke (H 1 ), the injection stroke (H 2 ) and the return stroke (H 3 ) in such a way that the guide device and the ram ( 150 , 250 , 350 ) are acted on jointly by the actuating element in the insertion stroke (H 1 ) and in such a way that only the ram ( 150 , 250 , 350 ) is acted on in the injection stroke (H 2 ), wherein the guide device includes a displaceable syringe holder ( 140 , 240 , 340 ) in which the syringe ( 100 , 200 , 300 , 400 ) is fixed and which is coupled releasably to the ram ( 150 , 250 , 350 ) and is part of an injection carriage, and, in order to perform a return stroke (H 3 ) corresponding in magnitude substantially to the insertion stroke (H 1 ), the actuating element ( 120 , 220 , 320 , 420 ) acts on the injection carriage in a positionally and directionally defined manner by means of locking and coupling elements with intercalation of a further carriage ( 114 A, 260 , 323 , 423 ).