| 摘要 |
<p>AN INJECTION DEVICE 1 INCLUDES A SYRINGE 7 HAVING A NEEDLE 23, A BARREL 21 AND A PLUNGER 25. THE DEVICE IS ARRANGED TO PROVIDE AN AUTOMATIC INJECTION CYCLE INCLUDING ADVANCING A NEEDLE FOR INSERTION, DISPENSING LIQUID FROM THE BARREL AND RETRACTING THE NEEDLE. THE DEVICE INCLUDES A DRIVE COUPLING ARRANGEMENT BETWEEN A DRIVING SPRING 13 AND THE SYRINGE 7. THE DRIVE COUPLING ARRANGEMENT INCLUDES A FIRST PART 15 AND A SECOND PART 17. A DRIVE FORCE IS SELECTIVELY TRANSMITTED OR NOT TRANSMITTED BETWEEN THE FIRST AND SECOND PARTS IN USE DEPENDING UPON THEIR RELATIVE ROTATIONAL POSITIONS SUCH THAT WHEN THE FIRST AND SECOND PARTS 15, 17 ARE IN A FIRST RELATIVE ROTATIONAL POSITION DURING THE DISPENSING STAGE A DRIVING FORCE IS TRANSMITTED TO THE PLUNGER TO DRIVE THE PLUNGER INTO THE BARREL, AND WHEN THE FIRST AND SECOND PARTS 15, 17 ARE IN A SECOND RELATIVE ROTATIONAL POSITION DURING THE REFRACTION STAGE NO FORCE IS TRANSMITTED TO THE PLUNGER TO ALLOW THE PLUNGER AND THE SYRINGE TO RETRACT. THE DRIVE COUPLING ARRANGEMENT TRANSMITS A DRIVING FORCE FROM SPRING 13 TO DRIVE FORWARD THE SYRINGE DURING A NEEDLE ADVANCEMENT STAGE TO ADVANCE THE NEEDLE AND DURING THE DISPENSING STAGE DRIVES THE PLUNGER 25 INTO THE BARREL 21 FOR DISPENSING LIQUID DEPENDING UPON THE CONFIGURATION OF THE DRIVE COUPLING ARRANGEMENT.</p> |
