Drive system for an infusion pump
First Claim
1. A liquid delivery system comprising:
- a housing which accommodates a syringe containing the liquid;
a motor carried by the housing;
a drive system, operatively connected with the motor, which advances a piston of the syringe to expel liquid from a barrel of the syringe, the drive system including;
a threaded rotatable shaft; and
a piston drive member, which linearly advances the piston, the drive member defining a threaded portion which engage threads of the shaft, the piston drive member advancing linearly as the shaft rotates.
6 Assignments
0 Petitions
Accused Products
Abstract
A pump system for an infusion system includes a linear drive (36, 36′) which minimizes the space occupied by the pump components in a portable housing (10, 10′). A motor (34) and a motor drive shaft (42) are arranged in parallel with, and adjacent to a syringe (14, 14′) and lead screw (94, 94′). A gear box (54) connects the drive shaft and lead screw to transfer rotational movements between them. A piston driving member, such as a cone (116) or drive nut (116′) converts the rotational movement of the lead screw into linear motion of a syringe piston (24). Sensors (150, 152) detect when the piston or cone is in a “home” position and in an “end” position, respectively. Optionally, a proximity sensor (170) is used to ensure that the cone and the piston (24) are abutting during dispensing. Alternatively, a clamping member (350) selectively clamps the lead screw (94′) against linear motion in at least a dispensing direction.
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Citations
31 Claims
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1. A liquid delivery system comprising:
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a housing which accommodates a syringe containing the liquid;
a motor carried by the housing;
a drive system, operatively connected with the motor, which advances a piston of the syringe to expel liquid from a barrel of the syringe, the drive system including;
a threaded rotatable shaft; and
a piston drive member, which linearly advances the piston, the drive member defining a threaded portion which engage threads of the shaft, the piston drive member advancing linearly as the shaft rotates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An infusion system comprising:
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a housing which receives a cartridge, the housing defining an opening for receiving the cartridge therethrough;
a threaded shaft which is selectively drivingly coupled with a piston of the cartridge, the threaded shaft linearly advancing the piston as the shaft rotates to expel a liquid from a barrel of the cartridge; and
a clamping member which is selectively actuated to engage the shaft and thereby inhibit linear advancement of the shaft, relative to the barrel. - View Dependent Claims (23, 24, 25, 27, 28, 29)
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26. A method of dispensing a liquid from a barrel of a cassette having a piston, comprising:
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(a) coupling a piston drive member to the piston, the piston drive member carrying a rotatable shaft;
(b) actuating a clamping means which clamps the shaft against linear motion in a dispensing direction;
(c) after step b, rotating the shaft to advance the piston drive member and the piston to dispense the fluid from the barrel.
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30. A method of dispensing a medicament from a cartridge including a barrel which receives a piston comprising:
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(a) bringing a piston drive member and the piston into an abutting relationship in a first position;
(b) sensing that the piston drive member is in the first position and sending a signal to a controller;
(c) advancing the piston drive member incrementally under the control of the controller to advance the piston to dispense the fluid from the barrel until the piston drive member is in a second position linearly spaced from the first position; and
(d) sensing that the piston drive member is in the second position and sending a signal to a controller. - View Dependent Claims (31)
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Specification