Safety device for a pre-filled syringe and injection device

摘要

According to the invention a safety device for a pre-filled syringe comprises a substantially cylindrical and hollow support body and a hollow needle shield slideably arranged relative to the support body. The support body comprises at least one resilient arm and the hollow needle shield or a needle shield assembly comprises at least one curved actuation ramp. The curved actuation ramp protrudes in a lateral direction (L) perpendicular to a central axis (A) of the safety device. The curved actuation ramp comprises a first lateral dimension (L1) at a proximal end of the needle shield and a second lateral dimension (L2) exceeding the first lateral dimension (L1) at a distal end of the needle shield. The resilient arm engages the curved actuation ramp when the needle shield is slid relative to the support body.

主权项

1. A safety device for a pre-filled syringe, comprising
a substantially cylindrical and hollow support body comprising at least one resilient arm having an inner surface; a hollow needle shield slideably arranged relative to the support body, wherein the needle shield or a needle shield assembly comprises at least one curved actuation ramp protruding in a lateral direction (L) perpendicular to a central axis (A) of the safety device, characterized in that the curved actuation ramp comprises an outside surface, a first lateral dimension (L1) at a proximal end of the needle shield and a second lateral dimension (L2) exceeding the first lateral dimension (L1) at a distal end of the needle shield, whereby the inner surface of the resilient arm engages the outside surface of the curved actuation ramp when the needle shield is slid relative to the support body; characterized in that the needle shield is slideable with respect to the support body from an initial position (I) to a retracted position (II) and further to an advanced position (III), wherein the needle shield protrudes the support body in the initial position (I) and in the advanced position (III) and whereas the needle shield is substantially received within the support body in the retracted position (II).