Needle insertion and retraction arrangment with manually triggered, spring-loaded drive mechanism
First Claim
1. A drive mechanism for a needle insertion arrangement, the drive mechanism comprising:
- a first roller adapted to frictionally engage a belt and rotatably arranged about an axis;
a second roller rotatably arranged about the axis;
a first spring adapted to rotatably bias the first roller against the second roller from a first angular position towards a second angular position;
a second spring adapted to rotatably bias the second roller against an arrester from a third angular position towards a fourth angular position;
the belt adapted to frictionally engage the first roller and adapted to be fixed to a needle retainer; and
a trigger mechanism adapted to releasably lock the first roller in the first angular position or the second roller in the third angular position.
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Accused Products
Abstract
Disclosed is a needle insertion arrangement (1) with a drive mechanism (9) comprising: a belt (15) frictionally engaging a first roller (10) and a needle retainer (7) with an injection needle (2) fixed to the belt, the first roller being rotatably arranged about an axis (A), a second roller (11) also rotatably arranged about the axis (A), a first spring (13) rotatably biasing the first roller against the second roller, a second spring (14) rotatably biasing the second roller against an arrester (12), the first and the second roller being connected via an internal protrusion (10.2) and arcuate slot (11.2), the two springs (13, 14) biasing the rollers (10, 11) from respective first to respective second angular positions (AP11, AP12, AP21, AP22), and a trigger mechanism (17,20) releasably locking the first and second rollers (10, 11) such that upon pivoting the trigger button (20) in one direction, the first roller drives the belt in one direction to linearly transport the needle retainer towards an extended position, and upon pivoting the trigger button in the other direction, the first roller drives the belt back to retract the needle retainer.
33 Citations
20 Claims
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1. A drive mechanism for a needle insertion arrangement, the drive mechanism comprising:
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a first roller adapted to frictionally engage a belt and rotatably arranged about an axis; a second roller rotatably arranged about the axis; a first spring adapted to rotatably bias the first roller against the second roller from a first angular position towards a second angular position; a second spring adapted to rotatably bias the second roller against an arrester from a third angular position towards a fourth angular position; the belt adapted to frictionally engage the first roller and adapted to be fixed to a needle retainer; and a trigger mechanism adapted to releasably lock the first roller in the first angular position or the second roller in the third angular position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An insertion arrangement for moving an injection needle between a retracted position and an extended position, the insertion arrangement comprising:
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a disposable unit comprising a needle base to which the injection needle is fixed; and a drive mechanism comprising; a first roller adapted to frictionally engage a belt and rotatably arranged about an axis; a second roller rotatably arranged about the axis; a first spring adapted to rotatably bias the first roller against the second roller from a first angular position towards a second angular position; a second spring adapted to rotatably bias the second roller against an arrester from a third angular position towards a fourth angular position; the belt adapted to frictionally engage the first roller and adapted to be fixed to a needle retainer; and a trigger mechanism adapted to releasably lock the first roller in the first angular position or the second roller in the third angular position, wherein the needle retainer is adapted to retain the needle base. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An auto-injector comprising:
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an insertion arrangement for moving an injection needle between a retracted position and an extended position, the insertion arrangement comprising; a disposable unit comprising a needle base to which the inaction needle is fixed; and a drive mechanism comprising; a first roller adapted to frictionally engage a belt and rotatably arranged about an axis; a second roller rotatably arranged about the axis; a first spring adapted to rotatably bias the first roller against the second roller from a first angular position towards a second angular position; a second spring adapted to rotatably bias the second roller against an arrester from a third angular position towards a fourth angular position; the belt adapted to frictionally engage the first roller and adapted to be fixed to a needle retainer; and a trigger mechanism adapted to releasably lock the first roller in the first angular position or the second roller in the third angular position, wherein the needle retainer is adapted to retain the needle base; and a drug container coupled to the injection needle, the drug container carrying a medicament consisting of at least one pharmaceutically active compound.
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Specification