Dosing Unit For An Infusion Pump Device

• US 20140039396A1
• Filed: 10/09/2013
• Published: 02/06/2014
• Est. Priority Date: 04/12/2011
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics International AG (Roche Holding AG)
• Inventors: Geipel, Andreas, Dogwiler, Joerg, Haueter, Ulrich, Scheurer, Simon, Zihlmann, Rudolf, Teutsch, David, Kuehni, Florian, Schaltegger, Reto
• Granted Patent: US 9,446,193 B2
• Time in Patent Office: Days
• US Class Current: 604/152
• CPC Class Codes: A61M 2005/1402 Priming
• CPC Class Codes: A61M 2005/14208 with a programmable infusion control system, characterised by the infusion program
• CPC Class Codes: A61M 2005/14264 with means for compensating influence from the environment
• CPC Class Codes: A61M 2005/16868 Downstream occlusion sensors
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3355 Controlling downstream pump pressure
• CPC Class Codes: A61M 2205/3365 Rotational speed
• CPC Class Codes: A61M 2205/3396 Reservoirs being alternately filled and emptied for measuring flow rate or delivered volume
• CPC Class Codes: A61M 5/14216 Reciprocating piston type
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/16809 by repeated filling and emptying of an intermediate volume pressure infusion using positive displacement pumps A61M5/142
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626

Abstract

A dosing unit for an ambulatory infusion pump device is presented. The dosing unit comprises a cylinder pump with a cylinder and a piston arranged in the cylinder. The piston has a shaft with a first threaded segment interacting with a threaded portion of the cylinder and can be displaced along a longitudinal axis of the cylinder by rotating the piston in regard to the cylinder around the axis. Furthermore, the piston allows for the relative or absolute determination of the longitudinal and/or rotational displacement of the piston in regard to the cylinder. In one embodiment, the piston shaft comprises a second segment provided with optically detectable markings that allow the monitoring of the longitudinal and/or rotational displacement of the piston in regard to the cylinder.

Claims

1. A dosing unit for an ambulatory infusion pump device, the dosing unit comprises:

a cylinder pump comprising,

a cylinder; and

a piston displaceable along a longitudinal axis of the cylinder, wherein the piston has a piston head and a piston shaft, wherein the piston shaft has a segment provided with markings that can be detected, and wherein the markings are a plurality of stripes arranged on the shaft segment.

2. The dosing unit according to claim 1, wherein the shaft segment is provided with markings in the form of at least two stripes arranged on the shaft segment along the circumference of the shaft and parallel to the longitudinal axis.

3. The dosing unit according to claim 1, wherein the shaft segment is provided with markings in the form of a multitude of circumferential rings arranged on a second shaft segment along the longitudinal axis.

4. The dosing unit according claim 1, wherein the markings are optically detectable stripes.

5. The dosing unit according to claim 1, further comprising,

a valve that can be in two operational states;

and

a window provided on the cylinder for providing optical access to the plurality of stripes,

wherein the window provides optical access to the plurality of stripes when the valve is in one of the two operational states and does not provide optical access to the plurality of stripes when the valve is between the two operational states.

6. The dosing unit according to claim 1, wherein the piston shaft comprises a threaded segment interacting with a threaded portion of the cylinder in such a way that the piston is displaced along the longitudinal axis when the piston shaft is rotated around the axis.

7. The dosing unit according to claim 6, wherein a second marker segment is between the first threaded segment and the piston head.

8. The dosing unit according to claim 7, wherein the second marker segment at least partially overlaps the first threaded segment.

16. An infusion pump device with a dosing unit according to claims 1.

17. An infusion pump device according to claim 16, further comprising,

one or more sensor units to detect the markings of the piston of the dosing unit mounted in the infusion pump device;

and

an evaluation unit that based on the signal received from the one or more sensor units determines an absolute position of the piston within the cylinder of the dosing unit and/or of a relative displacement of the piston within the cylinder.

18. The infusion pump device according to claim 17, wherein the markings of the piston of the dosing unit mounted in the infusion pump device are optical markings and that the dosing unit comprises a valve that can be in two operational states, and a window on the cylinder allowing optical access to the optical markings of the piston, wherein the optical access window and the one or more sensor units of the infusion pump device are arranged in such a way that the one or more sensor units have optical access to the optical markings when the valve is in one of the two operational states and have no optical access to the optical markings when the valve is between the two operational states.

19. A kit comprising an infusion pump device and one or more dosing units according to claim 1.

9. A dosing unit for an ambulatory infusion pump device, the dosing unit comprises:

a cylinder pump comprising,

a cylinder; and

a piston displaceable along a longitudinal axis of the cylinder, wherein the piston has optically detectable markings allowing for the determination of an absolute position of the piston within the cylinder and/or of a relative displacement within the cylinder;

a valve that can be in two operational states; and

a window on the cylinder for providing optical access to the optically detectable markings, wherein the optical access window provides optical access to the optically detectable markings when the valve is in one of the two operational states and does not provide optical access to the optically detectable markings when the valve is between the two operational states.

10. The dosing unit according to claim 9, wherein a piston shaft of the piston has a marker segment on which the optical markings are provided in the form of at least two stripes arranged on a second shaft segment along the circumference of the piston shaft and parallel to the longitudinal axis.

11. The dosing unit according to claim 9, wherein a piston shaft of the piston has a marker segment on which the optical markings are provided in the form of a plurality of optically circumferential rings arranged on a second shaft segment.

12. The dosing unit according to claim 9, wherein the piston comprises a piston head and a piston shaft with a threaded segment interacting with a threaded portion of the cylinder in such a way that the piston is displaced along the longitudinal axis when the piston shaft is rotated around the axis.

13. The dosing unit according to claim 12, wherein a second marker segment is between the first threaded segment and the piston head.

14. The dosing unit according to claim 13, wherein the second marker segment at least partially overlaps the first threaded segment.

15. The dosing unit according to claim 9, wherein the valve for alternatingly connecting an inner volume of the cylinder in a first operation state to an inlet conduit and in a second operational state to an outlet conduit comprising a valve seat and a valve member, wherein the valve member is part of the cylinder, and wherein the cylinder is rotatably or slidably mounted in a bearing of the valve seat such that the valve can be switched between the two states by rotating the cylinder with the valve member by a certain angle along the longitudinal axis of the cylinder, or by displacing the cylinder with the valve member in regard to the valve seat by a certain distance along the longitudinal axis.