Liquid drug delivery micropump

• US 20070071596A1
• Filed: 10/15/2004
• Published: 03/29/2007
• Est. Priority Date: 10/27/2003
• Status: Active Grant

• Current Assignee: Sensile Medical AG (Gerresheimer AG)
• Original Assignee: Sensile Pat Ag
• Inventors: Ryser, Peter, Straessler, Sigrid
• Granted Patent: US 7,726,955 B2
• Time in Patent Office: Days
• US Class Current: 415/172.100
• CPC Class Codes: A61M 2205/3546 Range
• CPC Class Codes: A61M 2205/6054 Magnetic identification systems
• CPC Class Codes: A61M 2209/01 Remote controllers for specific apparatus
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/16881 Regulating valves on-off valves, e.g. clamps A61M39/28
• CPC Class Codes: F04B 19/006 Micropumps F04B43/043 and F04B43/095 take precedence
• CPC Class Codes: F04B 7/06 the pistons and cylinders being relatively reciprocated and rotated

Abstract

A pump system for the subcutaneous delivery of a liquid medicament, having a pump module (10) comprising a stator housing (28) with a chamber (30), a rotor (32) rotatably and axially slidably received in the chamber and comprising a first axial extension (46) with a liquid supply channel (50) and a second axial extension with a liquid supply channel (52), the first and second axial extensions having different diameters, and first and second sealing rings (54, 56), mounted around the first and second axial extensions.

Claims

1. A pump system for the subcutaneous delivery of a liquid medicament, having a pump module (10) comprising

a stator housing (28) with a chamber (30),

a rotor (32) rotatably and axially slidably received in the chamber and comprising a first axial extension (46) and a second axial extension (48), the first and second axial extensions having different diameters, and

first and second sealing rings (54, 56), mounted around the first and second axial extensions.

2. The pump system according to claim 1, wherein the first and second axial extensions comprise liquid supply channels.

3. The pump system according to the preceding claim wherein the first and second sealing rings (54, 56) are mounted at an oblique angle φ

₁,φ

₂ with respect to a plane perpendicular to an axis of rotation of the rotor.

4. The pump system according to claim 2 or 3 wherein the sealing rings are O-ring seals.

5. The pump system according to any one of claims 2 to 4, wherein the liquid supply channels (50) are in the form of axially extending grooves on the surface of the axial extensions.

6. The pump system according to any one of the preceding claims, wherein the axial extensions extend from opposite sides of a body of the rotor.

7. The pump system according to any one of the preceding claims, wherein the rotor comprises one or more permanent magnets mounted close to a radial periphery of a body of the rotor.

8. The pump system according to any one of the preceding claims, further comprising magnetic induction coils (18) mounted in a stator part and acting on one or more permanent magnets mounted in the rotor to function as a step motor.

9. The pump system according to any one of the preceding claims, further comprising a position sensor (66) mounted in a stator part for detecting the axial position of the rotor and a position sensor (64) for detecting the axial position of the rotor

10. The pump system according to any one of the preceding claims, further comprising a reservoir (8) containing a supply of the liquid medicament, the pump module being assembled to the reservoir and having an inlet (42) in liquid communication with inside of the reservoir.

11. The pump system according to the preceding claim, wherein the pump module is mounted on the reservoir and forms therewith a disposable liquid supply unit (6).

12. The pump system according to any one of the preceding claims, further comprising an electronic control and communications module (20) connected to magnetic induction coils for driving the rotor.

13. The pump system according to the preceding claim, wherein the electronic control and communications module comprises a RF transceiver for wireless communication with a user'"'"'s display and control unit.

14. The pump system according to any one of the preceding claims, wherein the rotor is primarily made of injected plastic material.

15. The pump system according to the preceding claim, wherein magnets are embedded by overmolding in a body portion of the rotor.

16. The pump system according to any one of the preceding claims, wherein the stator housing is primarily made of injected plastic material.

17. The pump system according to any one of the preceding claims, wherein the pump module comprises a RFID transponder (23) storing information on calibration of the pump module related to the number of rotor revolutions as a function of the volume of liquid pumped.

18. The pump system according to claim 12 or 13, wherein the electronic control and communication module comprises a RFID reader (21) for wireless communication with a RFID transponder (23) mounted to a disposable liquid supply unit (6) comprising the pump module (10).