Rotation sensor for an injection device
AssigneeSanofi
InventorsMichael Helmer, Christian Rehbein
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a rotation sensor for an injection device, the rotation sensor comprising: a rotatable element configured for a mechanical engagement with a ratchet mechanism, the rotatable element comprising an outer rim and a hub is configured for transmission of a torque between the outer rim and the hub, at least one sensor attached to the rotatable element and configured to measure at least one of a mechanical force, a mechanical pressure or a mechanical strain at a portion of the rotatable element during a rotation of the rotatable element, a processor connected to the at least one sensor and configured to calculate an angle of rotation of the rotatable element on the basis of a sensor output of the at least one sensor.
Claims21
A rotation sensor for an injection device, the rotation sensor comprising:
- a rotatable element comprising an outer rim and a hub configured for transmission of a torque between the outer rim and the hub, wherein the rotatable element comprises at least one ratchet feature configured to periodically engage with at least one counter ratchet feature when the rotatable element is subject to a rotation relative to the counter ratchet feature;
- at least one sensor attached to, and rotationally fixed relative to, the rotatable element, and configured to measure a rotation of the rotatable element as the at least one sensor rotates with the rotatable element relative to the counter ratchet feature while the at least one ratchet feature periodically engages with the at least one counter ratchet feature;
- and
- a processor connected to the at least one sensor and configured to calculate an angle of rotation of the rotatable element based on a sensor output of the at least one sensor.
An injection device for setting and expelling of a dose of a medicament, the injection device comprising:
- a housing;
- a trigger to initiate and/or to control expelling of the dose;
- a dial member rotatable relative to the housing for setting of the dose;
- a ratchet mechanism;
- and
- a rotation sensor comprising:
- a rotatable element mechanically engaged with the ratchet mechanism, the rotatable element comprising an outer rim and a hub configured for transmission of a torque between the outer rim and the hub,
- at least one sensor attached to, and rotationally fixed relative to, the rotatable element, and configured to measure a rotation of the rotatable element as the at least one sensor rotates with the rotatable element relative to the housing while engaged with the ratchet mechanism, and
- a processor connected to the at least one sensor and configured to calculate an angle of rotation of the rotatable element based on a sensor output of the at least one sensor,
- wherein the rotatable element is rotationally locked to one of the dial member and the housing and wherein the rotatable element is rotatable relative to the other one of the dial member and the housing via the ratchet mechanism.
Dependencies are inferred from the claim text.