Device for subcutaneous delivery of fluid medicament
An improved device delivers a fluid medicament to the subcutaneous tissue of a user. The device is better suited for patients with Parkinson's Disease and other central nervous system disorders, than conventional infusion devices. The device can include a reusable part including a drive component (e.g., motor) and control electronics and a disposable part including a medicament reservoir. Medicament can be evacuated from the medicament reservoir by a plunger assembly that includes a plunger attached to a lead screw that is rotated by a nut, all within the disposable part. The device can be fluidically coupled with the tissue via a flexible cannula. Various embodiments relate to an improved cannula insertion mechanism that delivers the cannula under a force applied by a spring. Various embodiments relate to improved filling of the device, for example, using a vial adapter and an automated filling station.
1 . A device for delivering a fluid medicament into or through the skin of a user, the device comprising:
a reusable part comprising:
a drive component; and
a control unit for controlling the drive component; and
a disposable part engageable with the reusable part, the disposable part comprising:
a first reservoir for containing the fluid medicament, wherein the first reservoir comprises a first bushing;
a first plunger head, the first plunger head moveable in the first reservoir by a first lead screw; and
a first nut concentrically secured by and rotatable in the first bushing, the first nut threadedly engaged with a thread of the first lead screw, wherein the first bushing comprises a first compliant portion that permits the first nut a degree of lateral freedom of movement, and wherein the first nut is configured to be detachably coupled with and rotatable by the drive component upon engaging the reusable part with the disposable part and while the reusable part is engaged with the disposable part, and wherein the first nut is configured, upon rotation of the first nut in the first bushing, to linearly displace the first lead screw in a direction dependent on a rotation direction of the first nut.
2 . The device of claim 1 , wherein the disposable part further comprises:
a second reservoir for containing additional fluid medicament, wherein the second reservoir comprises a second bushing;
a second plunger head for driving the additional fluid medicament out of the second reservoir, the second plunger head moveable in the second reservoir by a second lead screw; and
a second nut concentrically secured by and rotatable in the second bushing, the second nut threadedly engaged with a thread of the second lead screw, wherein the second bushing comprises a second compliant portion that permits the second nut a degree of lateral freedom of movement, and wherein when the reusable part and the disposable part are attached, the second nut is operably coupled with and rotatable by the drive component in a direction controllable by the control unit, and wherein the second nut is configured, upon rotation of the second nut in the second bushing, to linearly displace the second lead screw in a direction dependent on a rotation direction of the second nut.
3 . The device of claim 1 , wherein the first nut comprises a first circumferential groove formed by a first circumferential ledge and a second circumferential ledge spaced apart from the first circumferential ledge, wherein the first bushing secures the first nut via the first compliant portion of the first bushing adapted to fit within the first circumferential groove of the first nut.
4 . The device of claim 3 , wherein each of the first circumferential groove and the first compliant portion comprises a rounded profile.
5 . The device of claim 3 , wherein a cross-section perpendicular to a first longitudinal axis of the first nut through the first compliant portion and the first circumferential groove forms two complete concentric circles.
6 . The device of claim 3 , wherein the fluid medicament in the first reservoir comprises levodopa or carbidopa, or a combination of levodopa and carbidopa.
7 . A disposable part for containing fluid medicament for delivery by a fluid medicament delivery device into or through the skin of a user, the disposable part comprising:
a first reservoir for containing the fluid medicament;
a first plunger head, the first plunger head moveable in the first reservoir by a first lead screw;
a first bushing disposed in the first reservoir; and
a first nut concentrically secured by and rotatable in the first bushing, wherein the first bushing comprises a first compliant portion that permits the first nut a degree of lateral freedom of movement, the first nut threadedly engaged with the first lead screw to linearly displace the first lead screw in the first reservoir in a direction dependent on a rotation direction of the first nut in the first bushing.
8 . The disposable part of claim 7 , further comprising:
a second reservoir for containing an additional fluid medicament;
a second plunger head, the second plunger head moveable in the second reservoir by a second lead screw;
a second bushing disposed in the second reservoir; and
a second nut concentrically secured by and rotatable in the second bushing, wherein the second bushing comprises a second compliant portion that permits the second nut a degree of lateral freedom of movement, the second nut threadedly engaged with the second lead screw to linearly displace the second lead screw in the second reservoir in a direction dependent on a rotation direction of the second nut in the second bushing.
9 . The disposable part of claim 7 , where the fluid medicament delivery device comprises a reusable part, and wherein the first nut is configured to be operably coupled with and rotatable by a drive component of the reusable part upon engaging the disposable part with the reusable part and while the disposable part is engaged with the reusable part.
10 . The device of claim 7 , wherein the first nut comprises a first circumferential groove formed by a first circumferential ledge and a second circumferential ledge spaced apart from the first circumferential ledge, wherein the first bushing secures the first nut via the first compliant portion of the first bushing adapted to fit within the first circumferential groove of the first nut.
11 . The disposable part of claim 10 , wherein each of the first circumferential groove and the first compliant portion comprises a rounded profile.
12 . The disposable part of claim 10 , wherein a cross-section perpendicular to a first longitudinal axis of the first nut through the first compliant portion and the first circumferential groove forms two complete concentric circles.
13 . The device of claim 10 , wherein the fluid medicament in the first reservoir comprises levodopa or carbidopa, or a combination of levodopa and carbidopa.
14 . A reservoir assembly for containing fluid medicament for delivery into or through the skin of a user by a fluid medicament delivery device comprising a reusable part, the reservoir assembly engageable with the reusable part and comprising:
a reservoir;
a plunger head, the plunger head moveable in the reservoir by a lead screw;
a bushing disposed in the reservoir; and
a nut concentrically secured by and rotatable in the bushing, wherein the bushing comprises a compliant portion that permits the nut a degree of lateral freedom of movement, the nut threadedly engaged with the lead screw to linearly displace the lead screw in the reservoir in a direction dependent on a rotation direction of the nut in the bushing.
15 . The reservoir assembly of claim 14 , wherein the nut is configured to be operably coupled with and rotatable by a drive component of the reusable part upon engaging the reservoir and the reusable part and while the reusable part is engaged with the reservoir.
16 . The reservoir assembly of claim 14 , wherein the nut comprises a circumferential groove formed by a first circumferential ledge and a second circumferential ledge spaced apart from the first circumferential ledge, wherein the bushing secures the nut via the compliant portion of the bushing adapted to fit within the circumferential groove.
17 . The reservoir assembly of claim 16 , wherein the circumferential groove and the compliant portion each comprises a rounded profile.
18 . The reservoir assembly of claim 16 , wherein a cross-section perpendicular to a longitudinal axis of the nut through the compliant portion and the circumferential groove forms two complete concentric circles.
19 . The reservoir assembly of claim 14 , wherein the fluid medicament to be contained in the reservoir comprises levodopa or carbidopa, or a combination of levodopa and carbidopa.