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US 2021/0236704 A1Published application
Stepper motor drive systems and tubing occluder system
AssigneeTerumo Cardiovascular Systems Corporation
InventorJames Bradley Atherton
Life of this patent
Estimating the term…
Abstract
This document describes stepper motor drive systems. The stepper motor drive systems can be used in many different applications including, for example, to drive a stepper motor of an occluder device in association with a heart-lung machine.
Claims20
A tube occluder system comprising:
- a tube clamp device configured to releasably receive a tube;
- a stepper motor having a first winding and a second winding, and arranged to adjust an amount of compression applied to the tube by the tube clamp device;
- and
- a drive system electrically coupled to the stepper motor and comprising:
- a first winding output port configured to electrically connect to a first winding input of the first winding;
- a first winding input port configured to electrically connect to a first winding output of the first winding;
- a second winding output port configured to electrically connect to a second winding input of a second winding;
- a second winding input port configured to electrically connect to a second winding output of the second winding;
- a first snubber circuit in electrical communication between the first winding input port and the second winding output port;
- and
- a second snubber circuit in electrical communication between the second winding input port and the first winding output port.
8 more elements
A method of recirculating energy in a stepper motor, the method comprising:
- providing power at a power bus to a first output and to a second output;
- flowing power through a first electrical load electrically connected to the first output;
- switching a first switch to block power flow out of the first electrical load to a low electrical potential bus;
- switching a second switch to permit power from the power bus to flow from the second output, through a second electrical load electrically connected to the second output, to the low electrical potential bus;
- directing, by a first snubber circuit, power flow out of the first electrical load to the second output;
- switching the second switch to block power flow out of the second electrical load to the low electrical potential bus;
- switching the first switch to permit power from the power bus to flow from the first output, though the first electrical load, to the low electrical potential bus;
- and
- directing, by a second snubber circuit, power flow out of the second electrical load to the first output.
6 more elements
An electrical drive system comprising:
- a first power output port configured to electrically connect to a first load input of a first electrical load;
- a first power input port configured to electrically connect to a first load output of the first electrical load;
- a second power output port configured to electrically connect to a second load input of a second electrical load;
- a second power input port configured to electrically connect to a second load output of the second electrical load;
- a first snubber circuit in electrical communication between the first load input port and the second load output port;
- and
- a second snubber circuit in electrical communication between the second load input port and the first load output port.
4 more elements
Dependencies are inferred from the claim text.