E-Module with Interface-Proof Inductive Sensing

• US 20080169307A1
• Filed: 02/13/2007
• Published: 07/17/2008
• Est. Priority Date: 02/14/2006
• Status: Abandoned Application

• Current Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Original Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Inventors: Hofstetter, Michael
• Application Number:
  US11/674,519
• Publication Number:
  US 20080169307A1
• Time in Patent Office: Days
• US Class Current: 222/14
• CPC Class Codes: A61M 2205/3317 Electromagnetic, inductive or dielectric measuring means
• CPC Class Codes: A61M 5/31525 Dosing burettes, pipettes B01L3/02
• CPC Class Codes: A61M 5/31546 Electrically operated dose setting, e.g. input via touch screen or plus/minus buttons
• CPC Class Codes: A61M 5/3155 by rotational movement of dose setting member, e.g. during setting or filling of a syringe
• CPC Class Codes: A61M 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/31556 Accuracy improving means
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

A dose setting module and method for use with an injection device, the module including at least one sensor element and at least one sensor actuating element, wherein the at least one sensor element and at least one sensor actuating element at least partially overlap along the longitudinal axis of the injection device and can be moved into at least one position in which they at least partially overlap in the circumferential direction of the injection device, and wherein the at least one sensor element generates a magnetic field and, in the at least one position, the at least one sensor actuating element causes a change in the magnetic field.

Claims

1. An injection device comprising a dose setting module comprising at least one sensor element and at least one sensor actuating element, wherein the at least one sensor element and at least one sensor actuating element at least partially overlap along a longitudinal axis of the injection device and can be moved into at least one position in which they at least partially overlap circumferentially relative to the injection device, and wherein the at least one sensor element generates a magnetic field and, in the at least one position, the at least one sensor actuating element causes a change in the magnetic field.

2. The injection device according to claim 1, further comprising an evaluating unit configured so that when there is no change in a magnetic field of a sensor element the evaluating unit generates a low signal for said sensor element and when a change is detected in the magnetic field of a sensor element the evaluating unit generates a high signal for said sensor element.

3. The injection device according to claim 2, wherein at least one sensor element of the at least one sensor elements is a Hall-effect sensor.

4. The injection device according to claim 2, further comprising a resetting mechanism comprising at least one resetting element moveable into at least one position circumferentially relative to the injection device by turning or sliding, whereby the resetting element and at least one of the at least one sensor elements at least partially overlap circumferentially.

5. The injection device according to claim 2, further comprising a reference sensor for detecting an external magnetic field, said reference sensor not overlapping any sensor actuating element longitudinally relative to the injection device.

6. The injection device according to claim 5, wherein the dose setting module further comprises an electrically conductive housing shell able to screen the sensor elements and the sensor actuating elements from the external magnetic field.

7. A dose setting module for an injection device, said dose setting module comprising at least one sensor element for measuring a magnetic field and at least one sensor actuating element, the at least one sensor element and at least one sensor actuating element at least partially overlapping in the longitudinal direction of the injection device, wherein at least one of the at least one sensor elements and at least one of the at least one sensor actuating elements can be moved into at least one position in circumferentially relative to the injection device by turning or sliding, wherein the at least one sensor element and at least one sensor actuating element at least partially overlap circumferentially, and wherein the at least one sensor element is able to generate a magnetic field and the at least one sensor actuating element can cause a change in the magnetic field in said at least one position.

8. The dose setting module as claimed in claim 7, comprising from two to six sensor elements, the sensor elements offset from one another in the longitudinal direction of the injection device.

9. The dose setting module as claimed claim 8, comprising from two to six sensor elements, the sensor elements offset from one another in the circumferential direction of the injection device.

10. The dose setting module as claimed claim 7, comprising from two to six sensor elements, the sensor elements offset from one another in the circumferential direction of the injection device.

11. The dose setting module as claimed in claim 7, comprising from two to six sensor actuating elements, the sensor actuating elements offset from one another in the longitudinal direction of the injection device.

12. The dose setting module as claimed in claim 11, comprising two or more sensor actuating elements, wherein at least two of the sensor actuating elements are offset from one another in the circumferential direction of the injection device.

13. The dose setting module as claimed in claim 7, comprising two or more sensor actuating elements, wherein at least two of the sensor actuating elements are offset from one another in the circumferential direction of the injection device.

14. The dose setting module as claimed in claim 7, wherein at least one sensor element is a Hall-effect sensor configured to detect a change in the magnetic field.

15. The dose setting module as claimed in claim 7, further comprising an evaluating unit configured so that when there is no change in a magnetic field of a sensor element the evaluating unit emits a low signal for said sensor element and when a change is detected in the magnetic field of a sensor element the evaluating unit emits a high signal for said sensor element.

16. The dose setting module as claimed in claim 7, further comprising a reference sensor element for detecting an external magnetic field, wherein the reference sensor element does not overlap with any sensor actuating system in the longitudinal direction of the injection device.

17. The dose setting module as claimed in claim 7, wherein the at least one sensor element comprises a coil and a magnetic core and is designed so that it can generate one of a magnetic field or a concentric magnetic field.

18. The dose setting module as claimed in claim 7, wherein the at least one sensor element and the at least one sensor actuating element are separated from one another by a housing part.

19. The dose setting module as claimed in claim 7, further comprising an electrically conductive housing shell around the dose setting module so that the electrically conductive housing shell screens the at least one sensor element and the at least one sensor actuating element from an external magnetic field.

20. The dose setting module as claimed in claim 7, wherein at least two sensor actuating elements have different lengths.

21. The dose setting module as claimed in claim 7, further comprising a resetting mechanism at least partially overlapping a sensor element in the longitudinal direction of the injection device.

22. The dose setting module as claimed in claim 21, wherein the resetting mechanism comprises at least one resetting element moveable into at least one position in the circumferential direction of the injection device by turning or sliding, whereby the resetting element and a sensor element at least partially overlap in the circumferential direction of the injection device.

23. A method of detecting a dose setting in an infusion or injection device comprising at least one sensor element, at least one sensor actuating element and an evaluation unit, wherein a magnetic field is generated by the at least one sensor element, the method comprising the steps of moving the at least one sensor element and at least one sensor actuating element into a relative position by turning or sliding, in which position the at least one sensor element and at least one sensor actuating element at least partially overlap and the at least one sensor actuating element causes a change in the magnetic field of the at least on sensor element.

24. The method as claimed in claim 23, wherein the change in the magnetic field at a sensor element is detected by the sensor element at which the change in magnetic field occurred.

25. The method as claimed in claim 24, wherein the infusion or injection device further comprises a reference sensor and wherein an external magnetic field is detected by the reference sensor.

26. The method as claimed in claim 25, wherein the external magnetic field is detected when changes are detected in the magnetic field of the respective sensor element at all of the at least one sensor elements.

27. The method as claimed in claim 23, wherein the evaluation unit generates a first signal when there are changes in the magnetic field of the at least one sensor element and a second signal different from the first signal when there is no change in the magnetic field of the at least one sensor element.

28. The method as claimed in claim 25, wherein the evaluation unit regulates the magnetic field at the at least one sensor element on the basis of the detected external magnetic field so that the external magnetic field is compensated at the at least one sensor element.

29. The method as claimed in claim 28, wherein the evaluation unit generates an error signal if the detected external field exceeds a pre-set value at which the external field can no longer be compensated.

30. The method as claimed in claim 23, wherein when there is a drop below a pre-set critical value for the change in the magnetic field at the at least one sensor element, the evaluation unit generates a first signal and when the pre-set critical value for the change in the magnetic field at the at least one sensor element is exceeded the evaluation unit generates a second signal different from the first signal.