Dispensing fluid from an infusion pump system
First Claim
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1. An infusion pump device, comprising:
- a pump housing that defines a space to receive a medicine;
a drive system to dispense a medicine from the pump housing when the medicine is received in the space, the drive system comprising;
an electrically powered actuator;
a drive wheel that rotates in response to movement of the electrically powered actuator; and
a piston rod that is engaged with the drive wheel, wherein the piston rod is advanced in a longitudinally forward direction relative to the drive wheel toward the space to receive the medicine in response to rotation of the drive wheel,wherein the drive wheel is spring-biased in an axial direction that is generally opposite to the longitudinally forward direction so that the drive wheel remains in a generally fixed axial position relative to the pump housing during forward advancement of the piston rod relative to the drive wheel.
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Abstract
Some embodiments of an infusion pump system include a drive system that advances a piston rod to dispense medicine to a user. Moreover, the drive system can be configured to reliably dose selected amounts of medicine to the user while also reducing the likelihood of inadvertent dispensing of medicine in response to impacts or pressure changes exerted upon the infusion pump system.
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Citations
20 Claims
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1. An infusion pump device, comprising:
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a pump housing that defines a space to receive a medicine; a drive system to dispense a medicine from the pump housing when the medicine is received in the space, the drive system comprising; an electrically powered actuator; a drive wheel that rotates in response to movement of the electrically powered actuator; and a piston rod that is engaged with the drive wheel, wherein the piston rod is advanced in a longitudinally forward direction relative to the drive wheel toward the space to receive the medicine in response to rotation of the drive wheel, wherein the drive wheel is spring-biased in an axial direction that is generally opposite to the longitudinally forward direction so that the drive wheel remains in a generally fixed axial position relative to the pump housing during forward advancement of the piston rod relative to the drive wheel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An infusion pump device, comprising:
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a pump housing that defines a space to receive a medicine; and a drive system to dispense the medicine from the pump housing when the medicine is received in the space, the drive system comprising; a piston rod that is advanced in a longitudinally forward direction toward the space to dispense the medicine; a drive wheel that rotates to advance the piston rod; a bias member positioned coaxial with the piston rod and the drive wheel, wherein the bias member urges the drive wheel in an axial direction that is generally opposite to the longitudinally forward direction so that the drive wheel remains in a generally fixed axial position relative to the pump housing during forward advancement of the piston rod relative to the drive wheel; a ratchet wheel that is incrementally rotated in a forward direction to rotate the drive wheel and thereby advance the piston rod; a movable pawl that engages the ratchet wheel, the movable pawl being adjustable from a reset position to a forward position so as to incrementally rotate the ratchet wheel in the forward direction; a spring device that urges the movable pawl to adjust from the reset position to the forward position; and an actuator assembly that acts upon the movable pawl to force the movable pawl to the reset position and that reverses to permit the movable pawl to adjust from the reset position to the forward position. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of dispensing medicine from an infusion pump device, comprising:
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rotating a drive wheel housed inside a pump housing of an infusion pump device in response to movement of an electrically powered actuator housed inside the pump housing; and in response to rotating the drive wheel, advancing a piston rod in a longitudinally forward direction toward a space defined by the pump housing that is configured to receive a medicine, wherein the drive wheel is urged by a bias member in an axial direction that is generally opposite to the longitudinally forward direction so that the drive wheel remains in a generally fixed axial position relative to the pump housing during advancement of the piston in the longitudinally forward direction. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification