Patent ID: 11964132
Assignee: YPSOMED AG
Field: Medical technology (Instruments)
Classification: CPC A  Y | IPC A

Claim 10:
11. An injection device for administering a substance, comprising
a housing;
a syringe with a needle, the syringe connected to the housing in an axially fixed manner during manual piercing by the needle by pushing the injection device onto or against a surface, the needle being surrounded by a protective sleeve in a first position of the protective sleeve and exposed from the protective sleeve when the protective sleeve is pushed back to a second position of the protective sleeve;
a plunger rod;
at least one retaining element associated with the plunger rod for retaining the plunger rod in a fixed position relative to the housing;
a displaceable lock comprising the protective sleeve, wherein the protective sleeve is configured to slide inside the housing and the displaceable lock holds, in the first position of the protective sleeve, the at least one retaining element in a retained position relative to the housing, and the displaceable lock releases, in the second position of the protective sleeve, the at least one retaining element; and
further retaining elements of the protective sleeve and the housing that, in a retaining position of the further retaining elements, generate an initial resistance retaining the protective sleeve in the first position when the protective sleeve is urged towards the second position by a user pushing the injection device onto or against the surface to be pierced, and that subsequently release the protective sleeve so that the protective sleeve slides abruptly into the injection device while the user manually pierces the surface with the needle,
wherein the protective sleeve comprises two arms extending axially to a same amount each having a proximal end in contact with a protective sleeve spring.