SENSING A STATUS OF AN INFUSER BASED ON SENSING MOTOR CONTROL AND POWER INPUT

• US 20180117248A1
• Filed: 12/27/2017
• Published: 05/03/2018
• Est. Priority Date: 05/03/2013
• Status: Active Grant

• Current Assignee: West Pharma. Services IL, Ltd. (West Pharmaceutical Services Incorporated)
• Original Assignee: Medimop Medical Projects Ltd. (West Pharmaceutical Services Incorporated)
• Inventors: CABIRI, Oz, FILMAN, Reuven Y.
• Granted Patent: US 10,398,837 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/16863 Occlusion detection
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence

Abstract

A status of a battery operated infuser may be detected by measuring a controlled input parameter. The measurement may be used to determine a magnitude of the input parameter and a parameter of the control. For example, control of power input to a motor may be by pulse density modulation. An integral of current over time may serve as a measure of current magnitude and pulse density. The result of the integral may be used to determine the status of the injector. The status may include normal functions for example start of pumping and/or malfunctions such as occlusion or drive disengagement.

Claims

1. A drug infusion device comprising:

a DC power source;

an actuator;

a performance sensor operationally coupled to an output of said actuator;

a controller which adjusts a power input of said actuator according to an output of said performance sensor;

an input sensor operationally coupled to said power input;

a processor which ascertains the status of the device dependent on said adjusting based on an output of said sensor.

2. The drug infusion device of claim 1, wherein said performance sensor includes a revolution counter.

3. The drug infusion device of claim 1, wherein said actuator includes a DC motor.

4. The drug infusion device of claim 3, further comprising:

a pulse density circuit, and wherein said adjusting is by pulse density modulation.

5. The drug infusion device of claim 4, wherein said sensor is a current sensor and said power input includes a current.

6. The drug infusion device of claim 5, wherein said processor computes a product of a magnitude of said current over time and wherein said ascertaining is dependent on said product.