Drive system for an infusion pump
7 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.
-
Citations
31 Claims
-
1-25. -25. (Canceled)
-
26. A method of dispensing a liquid from a barrel of a cassette having a piston, comprising:
-
(a) coupling a piston drive member to the piston, the piston drive member carrying a rotatable shaft;
(b) actuating a clamping mean 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. - View Dependent Claims (27, 28, 29)
-
-
30. A method of dispensing a medicament from a cartridge
including a barrel which receives a piston comprising: -
(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)
-
Specification