Syringe Pump, and Related Method and System
First Claim
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1. A syringe pump comprising:
- a body;
a motor;
a lead screw operatively coupled to the motor, wherein the motor is configured to actuate the lead screw;
a linear cam moveable between an extended position and a retracted position;
first and second half-nut arms pivotally coupled together, each having first and second ends, wherein the second ends of the first and second half-nut arms are configured to engage with the linear cam such that actuation of the linear cam toward the extended position causes the second ends of the first and second half-nut arms to pivotally approach each other to engage the lead screw.
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Accused Products
Abstract
A method for discharging fluid from a syringe and for mitigating occlusion conditions includes actuating the plunger of a syringe into a barrel. The method monitors fluid pressure within the barrel of the syringe and determines that an occlusion exists when the fluid pressure exceeds a predetermined threshold. The method actuates the plunger out of the barrel by a predetermined amount in response to the detected occlusion and actuates the plunger of the syringe into the barrel until a measured fluid pressure within the barrel of the syringe exceeds another predetermined threshold.
76 Citations
28 Claims
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1. A syringe pump comprising:
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a body; a motor; a lead screw operatively coupled to the motor, wherein the motor is configured to actuate the lead screw; a linear cam moveable between an extended position and a retracted position; first and second half-nut arms pivotally coupled together, each having first and second ends, wherein the second ends of the first and second half-nut arms are configured to engage with the linear cam such that actuation of the linear cam toward the extended position causes the second ends of the first and second half-nut arms to pivotally approach each other to engage the lead screw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28)
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27. A syringe pump comprising:
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a body; a motor; a lead screw operatively coupled to the motor, wherein the motor is configured to actuate the lead screw; a linear cam moveable between an extended position and a retracted position; first and second half-nut arms pivotally coupled together, each having first and second ends, wherein the second ends of the first and second half-nut arms are configured to engage with the linear cam such that actuation of the linear cam toward the extended position causes the second ends of the first and second half-nut arms to pivotally approach each other to engage the lead screw; and at least one processor operatively coupled to the motor and configured to control the rotation of the motor to thereby control actuation of a plunger head assembly, the at least one processor is also operatively coupled to a force sensor to receive a measured force therefrom, wherein the at least one processor is configured to; receive a target flow rate of the syringe loaded on the syringe pump; determine a therapy actuation speed corresponding to the target flow rate; command the motor to actuate the plunger of the syringe out of the barrel at a first predetermined speed until a force sensor coupled to the plunger measures a force that is less than a first predetermined force threshold or the plunger travels out of the barrel by a first predetermined distance; command the motor to actuate the plunger of the syringe into the barrel at a second predetermined speed greater than the therapy actuation speed until the force sensor coupled to the plunger measures a force that exceeds a second predetermined threshold or the plunger travels into the barrel by a second predetermined distance; and command the motor to actuate the plunger of the syringe into the barrel at the therapy actuation speed.
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Specification