초록 ▼

A fluid delivery device (1) for discharging a fluid comprises a housing (2, 3), piston pump (4), biasing mechanism (5, 101), and trigger mechanism (6); the housing (2, 3) comprising a basal end (3) and discharge end (2) having an outlet (10) for discharging the fluid; the piston pump (4) comprising

A fluid delivery device (1) for discharging a fluid comprises a housing (2, 3), piston pump (4), biasing mechanism (5, 101), and trigger mechanism (6); the housing (2, 3) comprising a basal end (3) and discharge end (2) having an outlet (10) for discharging the fluid; the piston pump (4) comprising a casing (20) defining a pump chamber (35) for fluid storage, piston (21) slidably movable relative to the pump chamber (35), piston plunger (22), and delivery channel (59) for delivering fluid discharged from pump chamber (35) to outlet (10); the trigger mechanism (6) being movable from cocked configuration, preventing transfer of biasing mechanism (5, 101) force to the casing (20) to prevent casing (20) movement towards the outlet (10), to triggered configuration, enabling transfer of biasing mechanism (5, 101) force to the casing (20) to cause casing (20) movement towards the outlet (10) to discharge fluid from the pump chamber (35). The biasing mechanism (5, 101) comprises one or more flexible catch members (104) which in cocked configuration are catched and in triggered configuration are decoupled from the housing (2, 3). The trigger mechanism (6) comprises a manually movable button (100) at the housing basal end (3) comprising an obstructer (114) that in cocked configuration engages the catch members (104) to prevent decoupling.

대표청구항 ▼

1. A fluid delivery device for discharging a fluid comprising: a housing;a piston pump;a biasing mechanism;an obstructor; anda trigger mechanism;the housing comprising a basal end and a discharge end, the discharge end having an outlet for discharging the fluid;the piston pump comprising a casing de

1. A fluid delivery device for discharging a fluid comprising: a housing;a piston pump;a biasing mechanism;an obstructor; anda trigger mechanism;the housing comprising a basal end and a discharge end, the discharge end having an outlet for discharging the fluid;the piston pump comprising a casing defining a pump chamber for storage of the fluid, a piston slidably movable relative to the pump chamber, a piston plunger, and a delivery channel for delivering fluid discharged from the pump chamber to the outlet of the housing;the trigger mechanism being movable from a cocked configuration to a triggered configuration;in the cocked configuration, the obstructor prevents transfer of a biasing force of the biasing mechanism to the casing to thereby prevent movement of the casing towards the outlet of the housing;in the triggered configuration the trigger mechanism enables transfer of the biasing force to the casing to thereby cause movement of the casing towards the outlet of the housing so as to discharge fluid from the pump chamber, along the delivery channel and out of the outlet of the housing;wherein the biasing mechanism comprises one or more flexible catch members which, in the cocked configuration, are catched to the housing and in the triggered configuration are decoupled from the housing;wherein, in the cocked configuration, the obstructor engages the one or more flexible catch members to prevent decoupling of the one or more catch members from the housing; andwherein the trigger mechanism comprises a button that is manually movable to the triggered configuration to displace the obstructor and permit the one or more flexible catch members to decouple from the housing. 2. The fluid delivery device as claimed in claim 1 wherein the button is movable along a longitudinal axis of the device between the cocked and triggered configurations. 3. The fluid delivery device as claimed in claim 1 wherein the biasing mechanism comprises a spring biasing the one or more catch members towards the triggered configuration. 4. The fluid delivery device as claimed in claim 1 wherein the one or more catch members and the housing comprise inter-engaging surfaces that, in the cocked configuration, urge the catch members to flex and decouple from the housing, wherein the position of obstructor in the cocked configuration prevents said flexure. 5. The fluid delivery device as claimed in claim 4 wherein the inter-engaging surfaces comprise inclined surfaces on the catch members. 6. The fluid delivery device as claimed in claim 1 wherein the button comprises, or is coupled to, an inwardly directed projection comprising an enlarged head at a distal end, wherein the enlarged head comprises the obstructor. 7. The fluid delivery device as claimed in claim 6 wherein the one or more flexible catch members comprises a plurality of flexible legs depending from a body portion, each flexible leg comprising a catch member at a distal end. 8. The fluid delivery device as claimed in claim 7 wherein, in the cocked configuration, the one or more catch members are located around the enlarged head of the obstructor and axially aligned therewith. 9. The fluid delivery device as claimed in claim 8 wherein the button comprises, or is coupled to, a narrow body below the obstructor and the button is movable into the triggered configuration by movement away from the basal end into the housing so as to slide the enlarged head of the obstructor within the flexible legs to bring the narrow body into alignment with the one or more catch members. 10. The fluid delivery device as claimed in claim 1 wherein the button comprises a body portion and a projecting portion formed from different materials; wherein the body portion is formed from a relatively flexible material and the projecting portion is formed from a relatively stiff material. 11. The fluid delivery device as claimed in claim 10 wherein the projecting portion comprises the obstructor. 12. The fluid delivery device as claimed in claim 10 wherein the body portion of the button forms a collapsible member. 13. The fluid delivery device as claimed in claim 1 further comprising a slide member which comprises the one or more flexible catch members. 14. The fluid delivery device as claimed in claim 13 wherein the slide member comprises a recess for receiving and, optionally, abutting against the casing. 15. The fluid delivery device as claimed in claim 13 wherein the slide member is configured, in the triggered configuration, to transfer the biasing force to the casing of the piston pump. 16. The fluid delivery device as claimed in claim 15 wherein the slide member transfers the biasing force to the casing by direct contact therebetween. 17. The fluid delivery device as claimed in claim 1 wherein the obstructor is configured, in the triggered configuration, to transfer the biasing force to the casing of the piston pump. 18. The fluid delivery device as claimed in claim 17 wherein the obstructor transfers the biasing force to the casing by direct contact therebetween. 19. The fluid delivery device as claimed in claim 17 wherein in the cocked configuration, one or more assembly gaps are present between components of the device, and the obstructor is of a sufficient length such that, starting from the cocked configuration, initial movement of the button causes the obstructor to contact and displace the casing and the piston to close said one or more assembly gaps prior to decoupling of the one or more catch members from the housing. 20. The fluid delivery device of claim 1 wherein the button is at least partially deformable such that in the triggered configuration the button is retained in a visibly deformed state to provide a visual indication to a user that the device has been activated. 21. The fluid delivery device of claim 1 wherein the piston and the piston plunger are fixed relative to the housing. 22. The fluid delivery device of claim 1 wherein the device is a single-use device. 23. The fluid delivery device of claim 1 combined with a single dose of fluid contained in the pump chamber. 24. The fluid device of claim 19 wherein said one or more assembly gaps include an assembly gap between the piston plunger and the piston.