Linear rotation stabilizer for a telescoping syringe stopper driverdriving assembly
First Claim
1. An assembly for driving a stopper in a drug reservoir of a drug delivery device, the assembly comprising:
- an anti-rotational stabilizer anti-rotationally coupled to a housing of the drug delivery device;
a stopper adapter configured to engage the stopper of the drug reservoir;
a telescoping assembly that telescopes by relative rotation between at least a proximal shaft and a distal shaft oriented along an axis of said reservoir;
the proximal shaft being linearly stabilized by a shoulder bearing of the anti-rotational stabilizer, said shoulder bearing preventing movement of said proximal shaft in a proximal direction with respect to the anti-rotational stabilizer while permitting rotation of said proximal shaft with respect to the anti-rotational stabilizer and the distal shaft being in engagement with the stopper adapter; and
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anti-rotational guides including telescoping posts anti-rotationally extending between the anti-rotational stabilizer and the stopper adapter,wherein rotating said proximal shaft with respect to said anti-rotational stabilizer moves said distal shaft and said stopper adapter along said axis, thereby slidably expanding the anti-rotational telescoping posts.
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Accused Products
Abstract
A cartridge interface assembly drives a stopper in a drug reservoir or a drug delivery device. An anti-rotational guide optionally moves along an axis of a cavity of the reservoir. The anti-rotational guide is optionally slidably anti-rotationally coupled to a housing of the drug delivery device. A telescoping plunger driver may include a proximal shaft and distal shaft that telescope by relative rotation. The distal shaft is optionally slidably anti-rotationally coupled to the anti-rotational guide. The shafts are optionally oriented along said axis. In some embodiments, rotating the proximal shaft with respect to the anti-rotational guide moves the guide along said axis with respect to the housing and moves the distal shaft along the axis with respect to the anti-rotational guide.
631 Citations
9 Claims
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1. An assembly for driving a stopper in a drug reservoir of a drug delivery device, the assembly comprising:
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an anti-rotational stabilizer anti-rotationally coupled to a housing of the drug delivery device; a stopper adapter configured to engage the stopper of the drug reservoir; a telescoping assembly that telescopes by relative rotation between at least a proximal shaft and a distal shaft oriented along an axis of said reservoir;
the proximal shaft being linearly stabilized by a shoulder bearing of the anti-rotational stabilizer, said shoulder bearing preventing movement of said proximal shaft in a proximal direction with respect to the anti-rotational stabilizer while permitting rotation of said proximal shaft with respect to the anti-rotational stabilizer and the distal shaft being in engagement with the stopper adapter; and
;anti-rotational guides including telescoping posts anti-rotationally extending between the anti-rotational stabilizer and the stopper adapter, wherein rotating said proximal shaft with respect to said anti-rotational stabilizer moves said distal shaft and said stopper adapter along said axis, thereby slidably expanding the anti-rotational telescoping posts. - View Dependent Claims (2, 3, 4)
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5. An assembly for driving a stopper in a drug reservoir of a drug delivery device, the assembly comprising:
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a telescoping assembly that telescopes by relative rotation between at least a proximal shaft and a distal shaft oriented along an axis of said reservoir;
said distal shaft configured to engage the stopper of the drug reservoir;an anti-rotational guide sized to move along said axis of the reservoir;
said anti-rotational guide slidably and anti-rotationally coupled to a housing of the drug delivery device;a coupling slidably and anti-rotationally linking said anti-rotational guide to said distal shaft;
said sliding and anti-rotation with respect to said axis of the reservoir such that rotating said proximal shaft with respect to said anti-rotational guide moves said distal shaft along said axis and moves said distal shaft with respect to said anti-rotational guide, said anti-rotational guide also moving along said axis;a linear stabilizer coupled to said proximal shaft, inhibiting axial movement of said proximal shaft in a proximal direction with respect to said linear stabilizer, said linear stabilizer coupled to the reservoir inhibiting axial movement of said linear stabilizer in a proximal direction with respect to the reservoir, such that said rotation of said proximal shaft causes said distal shaft to advance distally inside of the drug reservoir, wherein said linear stabilizer includes an anti-rotational connector fitting to said housing for preventing rotation of said linear stabilizer with respect to said housing and wherein said anti-rotational guide slidably engages to said housing by means of said linear stabilizer. - View Dependent Claims (6, 7, 8, 9)
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Specification