| 摘要 |
<p>A medical injector has a syringe body (80) with a needle (81) secured at the forward end thereof and a plunger (82) projecting from the rearward end. The plunger (82) is arranged to drive a piston (83) forwardly into the syringe body (80) to dispense medicament through the needle. A safety device for the syringe includes a sleeve (89) slidably mounted on the syringe and spring loaded to a forward position where the sleeve (89) covers the projecting needle (81). An outwardly directed protuberance (84) is disposed partway along the length of the plunger (82) and engageable with the syringe body (80). The protuberance (84) is resiliently movable inwardly of the plunger (82) and defines a stop position for the plunger, subsequent increased pressure on the plunger (82) then allowing the plunger to move forwardly to dispense medicament. The protuberance (84) allows proper sequencing of the injector such that the needle (81) may penetrate a patient before medicament is dispensed.</p> |
