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Publication Number
US-11690960-B2
Publication Date
2023-07-04
Expiration Date
Abstract
A syringe includes a dosage setter operatively coupled to a plunger rod and comprising a rotatable body that comprises a set of one or more stops for engaging the set of one or more protrusions of the plunger rod depending on at least a rotational position of the set of one or more stops relative to the set of one or more protrusions, wherein a first rotational adjustment associated with the dosage setter is configured to set a first dosage increment by adjusting a relative axial position between the rotatable body and the plunger rod, and a second rotational adjustment associated with the dosage setting assembly is configured to set a second dosage increment that is larger than the first dosage increment by adjusting a relative rotational alignment between the set of one or more stops and the set of one or more protrusions.
Core Innovation
The invention relates to a plunger rod assembly for a syringe that enables selectable dosage increments by using a dosage setter operatively coupled to a plunger rod. The plunger rod has one or more protrusions, and the dosage setter includes a rotatable body with one or more stops that engage the protrusions depending on a rotational position.
A first rotational adjustment associated with the dosage setter sets a first dosage increment by adjusting a relative axial position between the rotatable body and the plunger rod. A second rotational adjustment sets a second dosage increment that is larger than the first dosage increment by adjusting a relative rotational alignment between the stops and the protrusions.
The dosage setter defines a dosage delivery end position via different alignments of first stops with first protrusions, while a second stop defines a dosage delivery start position. The dosage delivery start position is the same for different dosage settings, and the document also describes end-of-dose indicators and a needle safety feature including a retractable needle cover locked in an extended position at the end of dosage delivery.
Claims Coverage
The document includes two independent claims. They focus on two rotational adjustments that set first and larger second dosage increments, and on a common dosage delivery start position with different dosage delivery end positions.
Two rotational adjustments for different dosage increments
A dosage setter having a rotatable body with one or more stops that engage one or more protrusions of a plunger rod depending on rotational position, where a first rotational adjustment sets a first dosage increment by adjusting relative axial position between the rotatable body and the plunger rod, and a second rotational adjustment sets a second dosage increment larger than the first by adjusting relative rotational alignment between the stops and the protrusions.
Common dosage delivery start with rotatable end-position stops
A dosage setter comprising a rotatable body with one or more first stops that align with one or more protrusions to define a dosage delivery end position, where different alignments define different dosage settings, and a second stop engages the one or more protrusions to define a dosage delivery start position that is the same for the different dosage settings.
Across the independent claims, the inventive concept is implemented by engaging protrusions on a plunger rod with stops on a rotatable dosage setter body. One claim distinguishes first and larger second dosage increments using a first rotational adjustment that changes relative axial position and a second rotational adjustment that changes relative rotational alignment. The other claim fixes the dosage delivery start position across different settings while varying the dosage delivery end position via different alignments of first stops with protrusions.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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