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US 11,969,583 B2Granted
Injection device with dose interruption fail safe
AssigneeMedmix Switzerland AG
InventorsJoachim Keitel, Herbert Bechtold
Life of this patent
Estimating the term…
Abstract
An injection device incorporating a dose setting mechanism is presented where the dose setting mechanism contains a fail safe feature that activates during an interrupted dose delivery event. A dose selector having a projecting rib engages a protrusion on a snap element to prevent the dose knob from moving distally if a user removes an axial force in the proximal direction during dose delivery. The dose setting mechanism can further include a reuse prevention feature.
Claims19
A dose setting mechanism comprising:
- a snap element;
- a dose knob;
- a floating spline positioned on an outer surface of the snap element such that the snap element can rotate relative to the floating spline, but is axially fixed on the outer surface;
- a dose selector comprising an inner surface having one or more dose stops that correspond to finite set of one or more predetermined fixed dose settings;
- and
- a fail safe mechanism comprising a protruding rib circumferentially positioned on the inner surface of the dose selector such that the protruding rib engages a protrusion on the outer surface of the snap element when an axial proximal force exerted on the dose knob is reduced.
3 more elements
A dose setting mechanism comprising:
- a dose knob;
- a dose selector;
- a radial projecting rib positioned circumferentially on an inside surface of the dose selector;
- and
- a snap element comprising a first protrusion and a second protrusion,
- wherein engagement of the second protrusion with the radial projecting rib prevents axial movement of the dose selector in a distal direction, the distal direction being a direction toward an end of the dose setting mechanism that is furthest from an injection site of a patient, and
- wherein the radial projecting rib further comprises a cut-out that is positioned in alignment with a dose stop that corresponds to one of a finite set of predetermined fix dose settings.
4 more elements
A dose setting mechanism comprising:
- a dose knob;
- a dose selector;
- a radial projecting rib positioned circumferentially on an inside surface of the dose selector;
- and
- a snap element comprising a first protrusion and a second protrusion,
- wherein engagement of the second protrusion with the radial projecting rib prevents axial movement of the dose selector in a distal direction, the distal direction being a direction toward an end of the dose setting mechanism that is furthest from an injection site of a patient, and
- wherein the dose selector only moves in a proximal direction to start a dose delivery when the second protrusion is aligned with a cut-out in the radial projecting rib.
4 more elements
A dose setting mechanism comprising:
- a dose knob;
- a dose selector;
- a radial projecting rib positioned circumferentially on an inside surface of the dose selector;
- and
- a snap element comprising a first protrusion and a second protrusion,
- wherein engagement of the second protrusion with the radial projecting rib prevents axial movement of the dose selector in a distal direction, the distal direction being a direction toward an end of the dose setting mechanism that is furthest from an injection site of a patient, and
- wherein the radial projecting rib comprises a plurality of cut-outs that are axially aligned to a plurality of dose stops positioned on an inside surface of the dose selector, where each dose stop corresponds to one of a finite set of predetermined fix dose settings.
4 more elements
A dose setting mechanism comprising:
- a dose knob;
- a dose selector;
- a radial projecting rib positioned circumferentially on an inside surface of the dose selector;
- and a snap element comprising a first protrusion and a second protrusion, wherein engagement of the second protrusion with the radial projecting rib prevents axial movement of the dose selector in a distal direction, the distal direction being a direction toward an end of the dose setting mechanism that is furthest from an injection site of a patient, and wherein the dose selector can only move in a distal direction during dose delivery when the second protrusion is aligned with the cut-out of the radial projecting rib.
1 more element
A dose setting mechanism comprising:
- a dose knob;
- a dose selector;
- a radial projecting rib positioned circumferentially on an inside surface of the dose selector;
- and
- a snap element comprising a first protrusion and a second protrusion,
- wherein engagement of the second protrusion with the radial projecting rib prevents axial movement of the dose selector in a distal direction, the distal direction being a direction toward an end of the dose setting mechanism that is furthest from an injection site of a patient,
- wherein the radial projecting rib comprises a plurality of cut-outs that are axially aligned to a plurality of dose stops positioned on an inside surface of the dose selector, where each dose stop corresponds to one of a finite set of predetermined fix dose settings, and
- wherein the dose knob can only move axially relative to the snap element, when the first protrusion is engaged with one of the dose stops of the dose selector.
5 more elements
A dose setting mechanism comprising:
- a dose knob;
- a dose selector;
- a radial projecting rib positioned circumferentially on an inside surface of the dose selector;
- and a snap element comprising a first protrusion and a second protrusion, wherein engagement of the second protrusion with the radial projecting rib prevents axial movement of the dose selector in a distal direction, the distal direction being a direction toward an end of the dose setting mechanism that is furthest from an injection site of a patient, and wherein the second protrusion will abut a proximal side of the radial projecting rib if the dose knob is released during dose delivery.
1 more element
Dependencies are inferred from the claim text.