Drug infusion system and method
First Claim
Patent Images
1. An infusion drive mechanism comprising:
- a housing member including an inner surface that defines a passageway defining a longitudinal axis;
a coil housing disposed with the housing member and including a coil, the coil housing further including a pole surface;
a piston defining a first axis and being movable within the passageway to convey at least one infusion medium;
a pole disposed with the housing member and being connected to the piston, the pole including a pole surface disposed in an electromagnetic flux path with the pole surface of the coil housing, the pole surface of the pole defining at least one cavity disposed adjacent to and non-concentric with the piston; and
a biasing member located within the at least one cavity and engaged with the pole surface of the coil housing to orient the first axis transverse relative to the longitudinal axis.
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Abstract
An actuator for an infusion drive mechanism comprises a piston defining a first axis and being movable within a passageway of the infusion drive mechanism to convey at least one infusion medium. The passageway defines a longitudinal axis. An armature is connected to the piston and defines at least one cavity configured for disposal of a biasing member engageable with a surface of the infusion drive mechanism to orient the first axis transverse relative to the longitudinal axis. Systems and methods of use are disclosed.
8 Citations
7 Claims
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1. An infusion drive mechanism comprising:
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a housing member including an inner surface that defines a passageway defining a longitudinal axis; a coil housing disposed with the housing member and including a coil, the coil housing further including a pole surface; a piston defining a first axis and being movable within the passageway to convey at least one infusion medium; a pole disposed with the housing member and being connected to the piston, the pole including a pole surface disposed in an electromagnetic flux path with the pole surface of the coil housing, the pole surface of the pole defining at least one cavity disposed adjacent to and non-concentric with the piston; and a biasing member located within the at least one cavity and engaged with the pole surface of the coil housing to orient the first axis transverse relative to the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An infusion pump comprising:
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a pump housing including an inlet, an outlet and an inner surface that defines a chamber disposed in communication with a central bore; a coil housing disposed with the chamber and including a selectively energizable coil, the coil housing further including a pole surface; a piston being movable within the central bore between a forward stroke and a return stroke to convey at least one infusion medium; a pole disposed with the pump housing and being connected to the piston to cause movement of the piston, the pole including a pole surface disposed in an electromagnetic flux path with the pole surface of the coil housing, the pole surface of the pole defining at least one cavity disposed adjacent to and non-concentric with the piston; and a coil spring located within the at least one cavity and engaged with the pole surface of the coil housing to dispose the piston at an angular orientation relative to the central bore.
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Specification