US 12,527,915 B2Granted

Injection device

AssigneeShl Medical AG

InventorsDonald William Steel, Elliot Henry Porter, Adam Jonathan Frederick Stops

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Abstract

An injection device has an outer housing that receives a syringe containing medicament, a movable stopper, and a needle. A plunger rod moves the stopper and a needle shield moves relative to the outer housing between a needle covering position and a needle exposing position, where the needle exposing position is axially rearward of the needle covering position. The needle shield is biased axially forwardly toward the needle covering position. A locking member is axially moveable in the outer housing from a first axial position to a second axial position in response to forward axial movement of the plunger rod. A locking sleeve is axially movable relative to the outer housing between a non-locking position and a locking position, the locking position being axially rearward of the non-locking position, in which axial movement of the locking sleeve is selectively limited by the locking member when in the second axial position.

Claims16

Dependent claims

An injection device comprising:

an outer housing configured to receive a syringe, the syringe having a barrel for containing medicament, a stopper that is axially moveable in the barrel, and a needle in fluid communication with the barrel;
a plunger rod that is axially moveable within the outer housing and configured for axially moving the stopper of the syringe when received in the outer housing;
a needle shield axially moveable relative to the outer housing between a needle covering position and a needle exposing position to selectively provide a needle enclosure, the needle exposing position being axially rearward of the needle covering position;
a biasing means for biasing the needle shield axially forwardly toward the needle covering position;
a locking member that is axially moveable in the outer housing from a first axial position to a second axial position in response to forward axial movement of the plunger rod;
a locking sleeve that is axially movable relative to the outer housing between a non-locking position and a locking position, the locking position being axially rearward of the non-locking position, in which axial movement of the locking sleeve is selectively limited by the locking member when in the second axial position;
wherein the locking member comprises one or more locking protrusions that are engageable with the locking sleeve when the locking sleeve is in the locking position, wherein engagement between the locking protrusions and the locking sleeve prevents forward axial movement of the locking sleeve relative to the locking member;
wherein in a first configuration the needle shield is in the needle covering position and the locking sleeve is in the non-locking position so that at least a portion of the needle shield is axially slideable within the locking sleeve to permit rearward axial movement of the needle shield from the needle covering position to the needle exposing position;
and
in a subsequent configuration the needle shield is in the needle covering position and the locking sleeve is in the locking position so that the needle shield is prevented from moving axially rearwardly by interference with the locking sleeve.

7 more elements

An injection device comprising:

an outer housing;
a syringe;
a plunger rod;
a needle shield that moves relative to the outer housing between a needle covering position and a needle exposing position, where the needle exposing position is axially rearward of the needle covering position;
a spring engaged with the needle shield to bias the needle shield axially forwardly toward the needle covering position;
a shut arm engageable with the plunger rod and that moves within and relative to the outer housing from a first axial position to a second axial position when the plunger rod moves forward axially relative to the outer housing;
and
a locking sleeve that moves between a non-locking position and a locking position, the locking position being axially rearward of the non-locking position, where axial movement of the locking sleeve is selectively limited when the locking member is in the second axial position;
wherein the locking sleeve moves from the non-locking position to the locking position when the needle shield moves from the needle covering position to the needle exposing position;
wherein the locking sleeve comprises a rear leg comprising a guiding portion and a hard stop and the shut arm comprises a locking protrusion that is engageable with the locking sleeve when the locking sleeve is in its locking position, where the locking protrusion is engaged with the locking sleeve when the locking protrusion is disposed along the guiding portion;
and
wherein when the needle shield is in the needle covering position, the locking sleeve is in the non-locking position such that the needle shield is axially slidable within the locking sleeve which permits rearward axial movement of the needle shield from the needle covering position to the needle exposing position.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/797,657Filed 11 Feb 2021
Priority: GB 200207514 Feb 2020
Published: US 2023/0062046 A12 Mar 2023
Granted: 20 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

A61M 5/2033
Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically: spring-loaded one-shot…
A61M 5/3243
Means for protection against accidental injuries by used needles: being axially-extensible, e.g. protective sleeves coaxially slidable on the…
A61M 5/3245
Being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel: constructional features thereof, e.g. to improve…
A61M 5/326
Being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel: fully automatic sleeve extension, i.e. in which…