Injection devices
First Claim
1. An injection device comprising a barrel (3, 10), spring means (20) within the barrel to act in a forward direction on a capsule (1) with a needle at its leading end housed therein, and a trigger (11) that holds the capsule (1) in a needle retracted position, actuation of the trigger (11) releasing the capsule for that to be urged forwardly by the spring means (20) to project the needle (2) through a passage at the leading end of the barrel (3, 10), characterised in that the trigger (11) has a portion for manual actuation and a portion (12, 14) that co-operates with the capsule, in that the barrel comprises two mutually telescoped parts (3, 10) one of which initially conceals said actuating portion, and in that, for operation, those parts have their telescopic overlap increased to energise the spring means (20) and to expose said portion for manual actuation.
1 Assignment
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Accused Products
Abstract
An injection device has a two part barrel. The forward part (10) telescopes into the rear part (3) and within the barrel a capsule (1) with a needle (2) at its forward end is initially held by a trigger (11) formed integrally with the forward part (10) so that the needle (2) does not project. The trigger (11) is inoperable at this stage, being inaccessible because of the telescopic overlap. A spring (20) acts on a plunger at the rear of the capsule. When the overlap is increased, the trigger (11) becomes accessible through a slot (7), and when it is operated the capsule (1) is released for the spring (20) to shoot it forwards and eject the dose through the now projecting needle (2). The capsule (1) may have a two part dose and its mixing may then be effected by the spring (20), fully compressed after the overlap increase, urging the plunger forwards.
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Citations
9 Claims
- 1. An injection device comprising a barrel (3, 10), spring means (20) within the barrel to act in a forward direction on a capsule (1) with a needle at its leading end housed therein, and a trigger (11) that holds the capsule (1) in a needle retracted position, actuation of the trigger (11) releasing the capsule for that to be urged forwardly by the spring means (20) to project the needle (2) through a passage at the leading end of the barrel (3, 10), characterised in that the trigger (11) has a portion for manual actuation and a portion (12, 14) that co-operates with the capsule, in that the barrel comprises two mutually telescoped parts (3, 10) one of which initially conceals said actuating portion, and in that, for operation, those parts have their telescopic overlap increased to energise the spring means (20) and to expose said portion for manual actuation.
Specification