Controlled delivery drive mechanisms for drug delivery pumps
First Claim
1. A controlled delivery drive mechanism comprising:
- a drug container having a barrel and a plunger seal;
a drive housing within which at least initially partially resides a piston having an interface surface and a drive rack, the interface surface being external to the drive housing;
a power spring coupled, directly or indirectly, to a drive pinion which interfaces with the drive rack of the piston to convert rotational movement of the power spring and the drive pinion to axial translation of the drive rack; and
an escapement regulating mechanism comprising a lever and an escape wheel,wherein the piston is configured to contact and axially translate the plunger seal within the barrel, and wherein the escapement regulating mechanism meters the drive pinion to axially translate the piston within the barrel at a controlled rate.
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Accused Products
Abstract
A controlled delivery drive mechanism includes a drug container having a barrel and a plunger seal; a drive housing within which at least initially partially resides a piston having an interface surface and a drive rack; and a power spring. The piston is configured to contact and axially translate the plunger seal within barrel. The mechanism may be configured to convert rotational movement of a drive pinion to axial translation of the drive rack, or to convert axial force of a linear power spring into torsional motion of a drive pinion. A regulating mechanism meters the drive pinion such that the piston is axially translated at a controlled rate. The drug container may contain a drug fluid within a drug chamber for drug delivery at a controlled rate. The regulating mechanism may be an escapement regulating mechanism. A drug delivery pump includes such controlled delivery drive mechanisms.
71 Citations
27 Claims
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1. A controlled delivery drive mechanism comprising:
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a drug container having a barrel and a plunger seal; a drive housing within which at least initially partially resides a piston having an interface surface and a drive rack, the interface surface being external to the drive housing; a power spring coupled, directly or indirectly, to a drive pinion which interfaces with the drive rack of the piston to convert rotational movement of the power spring and the drive pinion to axial translation of the drive rack; and an escapement regulating mechanism comprising a lever and an escape wheel, wherein the piston is configured to contact and axially translate the plunger seal within the barrel, and wherein the escapement regulating mechanism meters the drive pinion to axially translate the piston within the barrel at a controlled rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A controlled delivery drive mechanism, comprising:
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a drug container having a barrel and a plunger seal; a drive housing within which at least initially partially resides a piston having an interface surface and a drive rack; a power spring coupled, directly or indirectly, to a drive pinion which interfaces with the drive rack of the piston to convert rotational movement of the power spring and the drive pinion to axial translation of the drive rack, wherein the piston is configured to contact and axially translate the plunger seal within the barrel, and wherein a regulating mechanism meters the drive pinion such that the piston is axially translated within the barrel at a controlled rate; and a status reader configured to read or recognize one or more corresponding status triggers, wherein, during operation of the drive mechanism, interaction between the status reader and the status triggers transmits a signal to a power and control system to provide feedback to a user. - View Dependent Claims (24, 25, 26, 27)
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Specification