Multiple use disposable injection pen
First Claim
Patent Images
1. A medication injection pen, comprising:
- a housing;
a dose set knob comprising at least one internal tooth;
a brake member having a plurality of axially extending splines; and
a driver including at least one external tooth engaging said at least one internal tooth of said dose set knob and at least one ratchet arm engaging said plurality of axially extending splines,wherein said driver is prevented from rotating with said dose set knob while moving axially with said dose set knob during dose setting and dose correcting, and said driver rotates with said dose set knob during an injection.
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Abstract
A medication injection pen (51) includes a housing (1) and a dose set knob (2) having at least one internal tooth (22). A brake member (5) has a plurality of axially extending splines (52). A driver or setback member (9) includes at least one external tooth (92) engaging the at least one internal tooth (22) of the dose set knob (2) and at least one ratchet arm (96) engaging the plurality of axially extending splines (52). The driver (9) is prevented from rotating with the dose set knob (2) while moving axially with the dose set knob (2) during dose setting and dose correcting, and the driver (9) rotates with the dose set knob (2) during an injection.
76 Citations
20 Claims
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1. A medication injection pen, comprising:
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a housing; a dose set knob comprising at least one internal tooth; a brake member having a plurality of axially extending splines; and a driver including at least one external tooth engaging said at least one internal tooth of said dose set knob and at least one ratchet arm engaging said plurality of axially extending splines, wherein said driver is prevented from rotating with said dose set knob while moving axially with said dose set knob during dose setting and dose correcting, and said driver rotates with said dose set knob during an injection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A medication injection pen, comprising:
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a housing; a dose set knob for setting and correcting a dose; a brake member axially and rotationally fixed to said housing; a driver moving axially with said dose set knob when setting and correcting the dose with said dose set knob and moving rotationally with said dose set knob when injecting a set dose; a hollow piston rod moving axially when injecting the set dose; and a brake core member disposed within said hollow piston rod to substantially prevent rotational movement of said hollow piston rod. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification