Sensor Arrangement for an Injection Device

Patent metadata

Field	Value
Publication number	US-2018043104-A1
Application number	US-201615555853-A
Country	US
Kind code	A1
Filing date	Mar 1, 2016
Priority date	Mar 6, 2015
Publication date	Feb 15, 2018
Grant date	—

Abstract

The disclosure relates to a sensor arrangement for an injection device to determine an axial position of at least one device component of the injection device inside a housing of the injection device. The sensor arrangement includes an elongated member located inside the housing, extending in an axial direction and having at least a first section and a second section of different magnetization. The first and second sections are separated in an axial direction. The sensor arrangement also includes at least one magnetic sensor element attached to the housing to detect the axial position of at least one of the first and second sections.

First claim

1 - 14 (canceled)

15 . A sensor arrangement for an injection device to determine an axial position of at least one device component of the injection device inside a housing of the injection device, the sensor arrangement comprising:
an elongated member located inside the housing, extending in an axial direction and having at least a first section and a second section of different magnetization, the first and second sections being separated in an axial direction, and at least one magnetic sensor element attached to the housing to detect the axial position of at least one of the first and second sections.

16 . The sensor arrangement according to claim 15 , wherein the elongated member comprises a helical pattern of differently magnetized sections.

17 . The sensor arrangement according to claim 15 , further comprising a magnetic sensor array having multiple sensor elements separated in the axial direction.

18 . The sensor arrangement according to claim 17 , wherein the at least one magnetic sensor element or the sensor array is arranged in a sensor housing attachable to the housing of the injection device.

19 . The sensor arrangement according to claim 15 , wherein the elongated member comprises a magnetized material.

20 . The sensor arrangement according to claim 15 , wherein the elongated member comprises a magnetized coating.

21 . The sensor arrangement according to claim 15 , wherein the elongated member coincides with the at least one device component.

22 . The sensor arrangement according to claim 15 , wherein the elongated member is mechanically engaged with a second device component that is axially displaceable along the elongated member.

23 . The sensor arrangement according to claim 22 , wherein the second device component is ferromagnetic or ferrimagnetic.

24 . The sensor arrangement according to claim 22 , wherein the second device component is threadedly engaged with the elongated member and is rotatably fixed to the housing but slidably displaceable relative to the housing.

25 . The sensor arrangement according to claim 22 , wherein the second device component is threadedly engaged with the housing and is rotatably fixed to the elongated member but is slidably displaceable relative to the elongated member.

26 . The sensor arrangement according to claim 22 , wherein the second device component is a last dose limiting member of a drive mechanism of the injection device.

27 . The sensor arrangement according to claim 15 , wherein the elongated member is a piston rod, a dose indicator or a drive sleeve of a drive mechanism of the injection device.

28 . An injection device for setting and injecting of a dose of a liquid medicament, comprising:
a housing to accommodate a cartridge filled with the medicament, a drive mechanism comprising a piston rod to operably engage with a piston of the cartridge, and a sensor arrangement, attached to the housing or arranged inside the housing, the sensor arrangement comprising:
an elongated member located inside the housing, extending in an axial direction and having at least a first section and a second section of different magnetization, the first and second sections being separated in an axial direction, and
at least one magnetic sensor element attached to the housing to detect the axial position of at least one of the first and second sections.

29 . The injection device according to claim 28 , further comprising a cartridge filled with the medicament.

Assignees

• Sanofi Aventis Deutschland

Inventors

• Mueller Pathle Stephan

Classifications

• A61M5/31541

  Means preventing setting of a dose beyond the amount remaining in the cartridge · CPC title

• A61M5/31525

  Dosing (burettes, pipettes B01L3/02) · CPC title

• A61M2205/3584

  using modem, internet or Bluetooth® · CPC title

• A61M5/31593

  Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir · CPC title

• A61M2205/3561

  local, e.g. within room or hospital · CPC title