Becton Dickinson and Company Limited

Richard E Cronenberg

Michael Vincent Quinn

Haiming Wu

A medication injection pen comprises a dose set knob rotatable with respect to a housing to set a desired injection dose. The dose set knob comprises at least one internal thread. A leadscrew includes a thread element for advancing in a first direction via a corresponding thread engagement. A driver is rotationally fixed to the leadscrew and is rotatable in a first direction to rotate and advance the leadscrew in the first direction. The setback member is rotationally fixed to the driver. The dose stop member is rotationally coupled to the setback member and is axially movable relative to the dose set knob when the dose set knob is rotated relative to the setback member. Axial movement of the dose stop member limits the user from setting a dose that is greater than an injectable volume of medication remaining in a cartridge.

Injection pen with dial back and last dose control

An injection method is provided for using an injection pen, the injection pen comprising a housing, a lead screw axially moveable in the housing, a dose set member for dose setting and dose correcting, threadably connected to the housing and having a first mating feature, a setback member having a second mating feature for engaging the first mating feature, a clicker that generates an audible or tactile indication during operation, the clicker being operatively connected to the dose set member, and a push button operatively connected to the setback member to cause the second mating feature to engage the first mating feature during an injection, the push button receiving the clicker, wherein the first mating feature is disengaged from the second mating feature during the dose setting and the dose correcting and engaged with the second mating feature during the injection.

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Mahwah, NJ, United States of America

Richard E Cronenberg