Additive force device for drug delivery pen for intradermal medication injection

摘要

An additive force device (111) is connectible with a drug delivery device (100) to increase the amount of force exerted by a user on the dose setting knob (24) to facilitate injection. The additive force device (111) includes a first spring (121) and a loading barrel (135) connected to the first spring (121) for storing torque therein. A ratchet assembly (129) is connected to the loading barrel (135) and to the first spring (121). The ratchet assembly (129) has a first position in which torque is stored in the first spring (121) and a second position in which torque is released from the first spring (121). An inner barrel (133) is connected to the ratchet assembly and to the drug delivery device (100). The inner barrel (133) transmits the stored torque from the first spring (121) to the drug delivery device (100) to increase an injection force thereof.

主权项

1. An additive force device for use with a drug delivery device, comprising:
a first spring comprising a torsion spring and having a first end; a loading barrel connected to said first spring for storing torque therein; a ratchet assembly connected to said loading barrel and wherein said first spring is secured to said loading barrel, said ratchet assembly having a first position in which torque is stored in said first spring and a second position in which torque is released from said first spring; and an inner barrel connected to said ratchet assembly and to the drug delivery device, said inner barrel transmitting the stored torque from said first spring to the drug delivery device to increase an injection force thereof, wherein said ratchet assembly includes a lower ratchet and an upper ratchet, each of said lower and upper ratchets having a plurality of teeth for engagement therebetween.