Pump system

• US 7,726,955 B2
• Filed: 10/15/2004
• Issued: 06/01/2010
• Est. Priority Date: 10/27/2003
• Status: Active Grant

• Current Assignee: Sensile Medical AG (Gerresheimer AG)
• Original Assignee: Sensile Pat Ag
• Inventors: Ryser, Peter, Hilber, Josef, Straessler, Sigfrid
• Primary Examiner(s): Freay; Charles G
• Assistant Examiner(s): BERTHEAUD, PETER JOHN
• Application Number:
  US10/576,780
• Publication Number:
  US 20070071596A1
• Time in Patent Office: 2,055 Days
• Field of Search: 417/420, 417/423.1, 417/410.3, 417/410.1, 415/172.1, 415/170.1, 604/891.1
• US Class Current: 417/420
• 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 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 pumping of a liquid, having a pump module comprising:

a stator housing with a chamber,

a rotor rotatably and axially slidably received in the chamber and comprising a first axial extension comprising a liquid supply channel and a second axial extension comprising a liquid supply channel, the first and second axial extensions having different diameters, and

first and second sealing rings, mounted around the first and second axial extensions,

said liquid supply channel of each axial extension in conjunction with the corresponding sealing ring forming a valve that opens an closes as a function of the angular and axial displacement of the rotor.

2. The pump system according to claim 1, wherein the first and second sealing rings are mounted at an oblique angle with respect to a plane perpendicular to an axis of rotation of the rotor.

3. The pump system according to claim 1, wherein the sealing rings are O-ring seals.

4. The pump system according to claim 1, wherein the liquid supply channels are in the form of axially extending grooves on the surface of the axial extensions.

5. The pump system according to claim 1, wherein the axial extensions extend from opposite sides of a body of the rotor.

6. The pump system according to claim 1, wherein the rotor comprises one or more permanent magnets mounted close to a radial periphery of a body of the rotor.

7. The pump system according to claim 1, further comprising magnetic induction coils mounted in a stator part and acting on one or more permanent magnets mounted in the rotor to function as a step motor.

8. The pump system according to claim 1, further comprising a position sensor mounted in a stator part for detecting an axial position of the rotor.

9. The pump system according to claim 1, further comprising a reservoir containing a supply of liquid, the pump module being assembled to the reservoir and having an inlet in liquid communication with the reservoir.

10. The pump system according to claim 9, wherein the pump module is mounted on the reservoir and forms therewith a disposable liquid supply unit.

11. The pump system according to claim 1, further comprising an electronic control and communications module connected to magnetic induction coils for driving the rotor.

12. The pump system according to claim 11, wherein the electronic control and communications module comprises a RF transceiver for wireless communication with a user'"'"'s display and control unit.

13. The pump system according to claim 1, wherein the rotor is primarily made of injected plastic material.

14. The pump system according to claim 13, wherein magnets are embedded by overmolding in a body portion of the rotor.

15. The pump system according to claim 1, wherein the stator housing is primarily made of injected plastic material.

16. The pump system according to claim 1, wherein the pump module comprises a RFID transponder storing information on calibration of the pump module related to the number of rotor revolutions as a function of the volume of liquid pumped.

17. The pump system according to claim 11, wherein the electronic control and communication module comprises a RFID reader for wireless communication with a RFID transponder mounted to a disposable liquid supply unit comprising the pump module.