Injection device
First Claim
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 (H1) and a return stroke (H3), and into a displacement of the plunger rod during an injection stroke (H2), 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 (H1), the injection stroke (H2) and the return stroke (H3) 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 (H1) and in such a way that only the ram (150, 250, 350) is acted on in the injection stroke (H2), 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 (H3) corresponding in magnitude substantially to the insertion stroke (H1), 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 (114A, 260, 323, 423).
4 Assignments
0 Petitions
Accused Products
Abstract
An injection device for a syringe, having a syringe body, a cannula with a needle, a plunger with a plunger rod, and an injection carriage for displacing the syringe body and the plunger, comprises at least one actuating element that acts on the injection carriage to carry out the injection procedure. The actuating element (120, 220, 320) cooperates with components which withdraw the needle (108, 208, 308) from the puncture site once the injection procedure has been completed, using a return stroke (H3) that is applied to the injection carriage. A single, targeted linear movement inserts the needle to a defined depth, injects the medicament and, once the injection has been completed, produces a return stroke which allows the needle to be withdrawn into the housing and thus out from the puncture site.
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Citations
31 Claims
- 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 (H1) and a return stroke (H3), and into a displacement of the plunger rod during an injection stroke (H2), 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 (H1), the injection stroke (H2) and the return stroke (H3) 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 (H1) and in such a way that only the ram (150, 250, 350) is acted on in the injection stroke (H2), 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 (H3) corresponding in magnitude substantially to the insertion stroke (H1), 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 (114A, 260, 323, 423).
Specification