# US 10,478,550 B2 · Device with a Lavet-type motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,478,550 B2 - Document ID: US10478550B2 - Status: Granted - Kind: B2 - Application number: 14/908,002 - Filed: 2014-08-26 - Published: 2016-06-16 - Granted: 2019-11-19 - Earliest claimed: 2013-08-27 - Assignees: PharmaSens AG - Applicants: PharmaSens AG - Inventors: Paul Hadvary; Rudolf Dinger; Hansjorg Tschirky - Web page: https://patentgrep.com/patent/US10478550B2 ## CPC - A61M 5/14216: {Reciprocating piston type} - A61M 5/14232: {Roller pumps} - A61M 5/14248: {of the skin patch type} - A61M 5/1452: {pressurised by means of pistons} - A61M 5/1483: {using flexible bags externally pressurised by fluid pressure} - A61M 5/1723: {using feedback of body parameters, e.g. blood sugar or pressure} - A61M 5/14228: {with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member} - A61M 2005/14208: {with a programmable infusion control system, characterised by the infusion program} - A61M 2005/14252: {with needle insertion means} - A61M 2005/14268: {with a reusable and a disposable component} - A61M 2005/14506: {mechanically driven, e.g. spring or clockwork} - A61M 2205/8212: with means or measures taken for minimising energy consumption - A61M 2230/201: Glucose concentration - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract In a device for ambulatory wearing by the patient containing a pump for delivery of injection fluid or for removal of analysis fluid, the drive motor for the mechanically driven pump system is a Lavet-type stepper motor of small size designed for having a high mechanical power and low peak current requirement. Using this Lavet-type motor for syringe-type or peristaltic preferably patch-type pumps high infusion rates needed for e.g. bolus insulin injection or the delivery of therapeutic antibodies are achieved, and important safety features can be easily and reliably controlled, manufacturing costs get significantly reduced, and the overall size and weight of the device becomes smaller, for patient convenience. ## Claims ### Claim 1 A device for ambulatory wearing by a patient, comprising: a pump for delivery of injection fluid including a pump system with a fluid reservoirs; and a Lavet-type stepper motor to drive the pump system, the stepper motor including a rotor with a magnet made of high energy density magnetic material which is a magnetic alloy including a rare earth element, wherein when the stepper motor successfully performs a step, there is an induced current of opposite polarity with respect to applied voltage pulse, and when the stepper motor does not successfully perform the step, there is an induced current that is of a same polarity with respect to the applied voltage pulse, wherein a maximum speed of the stepper motor is restricted by a design of the stepper motor, wherein a maximum torque of the stepper motor is restricted by a design of the stepper motor, wherein the injection fluid includes therapeutic proteins like insulin or antibodies. ### Claim 2 (depends on 1) The device according to claim 1 wherein constructive and electronics features of the Lavet-type motor are designed and used to: provide high powerless holding torque, and allow detection of necessary torque for the step. ### Claim 3 (depends on 1) The device according to claim 1 wherein the rotor magnet is made from a Samarium Cobalt (SmCo) alloy or from an Iron Neodym Boron (FeNdB) alloy. ### Claim 4 (depends on 1) The device according to claim 1 wherein the pump system includes a syringe having as reservoir, a tubular barrel with a connecting opening in a vicinity of one end of the barrel for the passage of fluid, and a piston movable along an axis and fitting in the interior of the barrel with a piston moving rod for moving the piston. ### Claim 5 (depends on 4) The device according to claim 4 wherein the barrel has a toroidal shape, and the piston moving rod is circularly bent curved and corresponds to the axis of the barrel. ### Claim 6 (depends on 1) The device according to claim 1 wherein the pump system includes a flexible bag reservoir and a plunger squeezing the bag. ### Claim 7 (depends on 1) The device according to claim 1 wherein the pump system includes a peristaltic pump with a reservoir. ### Claim 8 (depends on 7) The device according to claim 7 wherein pulsations in delivery are minimized by regulating the motor step frequency. ### Claim 9 (depends on 7) The device according to claim 7 wherein rollers compressing a peristaltic tube and a form of the pump casing against which the peristaltic tube is pressed by the rollers are arranged such that occlusion of the tube by the roller rolling-on and opening of the tube to its natural state after the passing of the roller rolling-off, respectively takes place synchronously and thus largely eliminates the motor torque needed for compression of the tube by the roller rolling-on. ### Claim 10 (depends on 1) The device according to claim 1 further comprising a motor control system comprising a drive electronics component, an operation control component and a control unit for programming pump function. ### Claim 11 (depends on 10) The device according to claim 10 wherein the operation control component has an element for adjusting a motor pulse duration and/or a pulse voltage in order to determine a torque the motor is delivering to the pump. ### Claim 12 The device according to 10 wherein the operation control component has an element analyzing motor current and/or voltage to control the motor steps. ### Claim 13 (depends on 10) The device according to claim 10 wherein the operation control element has a magnetic field sensor to control the motor steps. ### Claim 14 (depends on 10) The device according to claim 10 wherein the operation control element is controlling over-delivery or under-delivery and other safety related features and alarms. ### Claim 15 (depends on 1) The device according to claim 1 wherein a control unit for programming pump function has a remote element connected by a wireless link. ### Claim 16 (depends on 15) The device according to claim 15 further comprises an inbuilt or remote diagnostic probe, generating signals for the control unit. ### Claim 17 (depends on 16) The device according to claim 16 wherein the diagnostic probe is a glucose sensor generating signals for controlling insulin delivery. ### Claim 18 (depends on 1) The device according to claim 1 wherein the device is an insulin pump. ### Claim 19 (depends on 1) The device according to claim 1 wherein the pump is collecting body fluid samples for analyte determination. ### Claim 20 (depends on 1) The device according to claim 1 further comprising an adhesive contact surface for contacting the patient's skin and adhering the device to the patient's skin. ### Claim 21 (depends on 1) The device according to claim 1, wherein the device includes a reusable part comprising the stepper motor and control elements, and a disposable part comprising other elements. ### Claim 22 (depends on 21) The device according to claim 21, further comprising: a self-adjusting gear-gear connection coupling the stepper motor and the pump system. ### Claim 23 (depends on 21) The device according to claim 21 wherein the reservoir is filled before assembly of the reusable and disposable parts, before coupling of the stepper motor and the pump system, and not requiring a rewind by the stepper motor. ### Claim 24 (depends on 1) The device according to claim 1 further comprising: a cannula having a tip for piercing the patient's skin; and a diagnostic probe. ### Claim 25 (depends on 1) The device according to claim 1 further comprising: an adhesive layer fixed on the device for adhering to skin of the patient. ### Claim 26 (depends on 1) The device according to claim 1 wherein the device is applied to the skin using a functional package with a pressing an adhesive layer towards the skin and protecting release and actuation elements of the device against unintended activation.