Injection devices
First Claim
1. An injection device comprising:
- i) a barrel with an opening at a forward end, ii) a syringe carrier within the barrel and axially movable between a rearward position, in which a syringe carried thereby is retracted so that its needle is non-projecting from said forward end, and a forward position, in which the needle projects from said forward end, iii) spring means acting between the barrel and the syringe carrier to urge the syringe carrier rearwardly, iv) a connector with limited axial movement carried within the barrel and receiving the rear end of the syringe carrier within its forward end, v) a removable locking element inserted laterally through the barrel to engage and hold at least one of the connector and the syringe carrier against axial movement, its removal freeing both for axial movement, and vi) a locking element on the connector that snap fits to the barrel, the locking element being prevented from engaging the barrel before use and during injection, wherein forward movement of the carrier relative to the connector upon effecting an injection frees the locking element to snap fit to the barrel when, after injection, the spring means urges the carrier, and hence the syringe and the connector, rearwardly, vii) and wherein the rear end of the connector is adapted to receive a firing device, the firing device having an element to engage a piston within the syringe so that, when fired with the connector at its forward position, the syringe with its carrier is first thrust forwards to project the needle from the forward end of the barrel by the element acting through the piston and the dose within the syringe and then the piston is urged forwards to eject the dose.
1 Assignment
0 Petitions
Accused Products
Abstract
An injection device is disposable, and is designed to have a reusable firing mechanism fitted to its rear end. A syringe carrier within the barrel of the device is initially locked in a position with the needle of the syringe retracted by a locking element inserted laterally through the barrel. This element also holds an axially movable connector to which the firing mechanism connects. The device is made operable by removal of the locking element, and after use a return spring ensures that neither the syringe carrier nor the connector assume positions where the locking element can be reinserted. An adaptor may be provided to facilitate preparing a syringe with a two-component dose, and for disposal after use the adaptor with an empty vial still attached can be fitted to the rear end of the injection device in place of the firing mechanism.
166 Citations
17 Claims
-
1. An injection device comprising:
-
i) a barrel with an opening at a forward end, ii) a syringe carrier within the barrel and axially movable between a rearward position, in which a syringe carried thereby is retracted so that its needle is non-projecting from said forward end, and a forward position, in which the needle projects from said forward end, iii) spring means acting between the barrel and the syringe carrier to urge the syringe carrier rearwardly, iv) a connector with limited axial movement carried within the barrel and receiving the rear end of the syringe carrier within its forward end, v) a removable locking element inserted laterally through the barrel to engage and hold at least one of the connector and the syringe carrier against axial movement, its removal freeing both for axial movement, and vi) a locking element on the connector that snap fits to the barrel, the locking element being prevented from engaging the barrel before use and during injection, wherein forward movement of the carrier relative to the connector upon effecting an injection frees the locking element to snap fit to the barrel when, after injection, the spring means urges the carrier, and hence the syringe and the connector, rearwardly, vii) and wherein the rear end of the connector is adapted to receive a firing device, the firing device having an element to engage a piston within the syringe so that, when fired with the connector at its forward position, the syringe with its carrier is first thrust forwards to project the needle from the forward end of the barrel by the element acting through the piston and the dose within the syringe and then the piston is urged forwards to eject the dose. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification