Infusion pump with magnetic bag compression
First Claim
1. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
- a housing comprising first and second housing portions removably attachable to each other and defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag;
a platen of magnetizable metal disposed within the housing; and
magnet means disposed within the housing for movement between a first position of maximum distance from the platen and a second position of minimum distance from the platen;
wherein a reservoir bag seated on the plate is compressed by the movement of the magnet means from the first position to the second position in response to the force of magnetic attraction between the magnet means and the platen.
2 Assignments
0 Petitions
Accused Products
Abstract
An infusion pump for providing a pressurized liquid flow from a collapsible, deformable reservoir bag includes a magnetically actuated pressurizing member that applies a pressure to the bag in response to the force of magnetic attraction applied by a magnet. In several embodiments, a bag is seated on a platen of magnetizable metal, and a magnet with a compressing surface is mounted for movement toward and away from the platen. As the magnet is moved toward the platen by the force of magnetic attraction, the bag is pressurized between the magnet and the platen. The magnet may be spring biased either toward or away from the platen to alter the relationship between the decreasing volume of the bag and the pressure applied to it, by compensating in a known manner for the change in the magnitude of the magnetic force with the distance between the magnet and the platen. In another embodiment, a pair of magnets are pivotably attached to opposed edges of the platen, so as to be pivotable, "drawbridge" style, toward and away from the platen. In still another embodiment, a fixed magnet attracts a magnetizable metal plate which is connected, by a pivoting linkage, to a pressure plate. A reservoir bag is placed between the pressure plate and a fixed surface. As the metal plate moves toward the magnet, the linkage causes the pressure plate to move toward the fixed surface, pressurizing the bag therebetween.
239 Citations
30 Claims
-
1. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
-
a housing comprising first and second housing portions removably attachable to each other and defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag; a platen of magnetizable metal disposed within the housing; and magnet means disposed within the housing for movement between a first position of maximum distance from the platen and a second position of minimum distance from the platen; wherein a reservoir bag seated on the plate is compressed by the movement of the magnet means from the first position to the second position in response to the force of magnetic attraction between the magnet means and the platen. - View Dependent Claims (2, 3, 4, 5, 6, 20)
-
-
7. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
-
a housing defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag, the housing including a first housing portion having a proximal interior surface and a second housing portion having a distal interior surface, the first and second housing portions being removably attachable to each other; a platen of magnetizable metal fixed to the distal interior surface; and magnet means disposed within the housing for movement between a first position of maximum distance from the platen and a second position of minimum distance from the platen; wherein a reservoir bag seated on the platen is compressed by the movement of the magnet means from the first position to the second position in response to the force of magnetic attraction between the magnet means and the platen. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
-
-
15. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
-
a housing defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag, the housing including a first housing portion having a proximal interior surface and a second housing portion having a distal interior surface, the first and second housing portions being removably attachable to each other; a pressure plate disposed within the housing and movable between a first position of maximum distance from the distal interior surface and a second position of minimum distance from the distal interior surface; and magnetic means, disposed within the housing, for moving the pressure plate between the first and second positions by the force of magnetic attraction; whereby a reservoir bag disposed within the housing between the pressure plate and the distal interior surface is compressed by the movement of the pressure plate from the first position to the second position. - View Dependent Claims (16, 17)
-
-
18. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
-
a housing defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag, the housing including a first housing portion having a proximal interior surface and a second housing portion having a distal interior surface, the first and second housing portions being removably attachable to each other; a platen of magnetizable metal fixed to the distal interior surface and having a peripheral edge; and first and second magnets disposed within the housing for movement between a first position of maximum distance from the platen and a second position of minimum distance from the platen, each of the magnets having a pivoting edge that is pivotably connected to the peripheral edge of the platen, whereby the first and second magnets are pivotable at their respective pivoting edges between the first position and the second position; wherein a reservoir bag seated on the platen is compressed by the movement of the first and second magnets from the first position to the second position in response to the force of magnetic attraction between the first and second magnets and the platen. - View Dependent Claims (19, 21)
-
-
22. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
-
a housing defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag, the housing including a first housing portion having a proximal interior surface and a second housing portion having a distal interior surface, the first and second housing portions being removably attachable to each other; a platen of magnetizable metal fixed to the distal interior surface; a guide member extending distally into the interior chamber from the proximal interior surface, and having a distal end; a magnet disposed on the guide member for axial translation between a first position of maximum distance from the platen and a second position of minimum distance from the platen; and a spring, disposed between the proximal interior surface and the magnet, that biases the magnet toward the second position. - View Dependent Claims (23, 24, 25, 26, 27)
-
-
28. An infusion pump for providing a pressurized liquid flow from a collapsible, deformable, liquid-filled reservoir bag, the pump comprising:
-
a housing defining an interior chamber sized to receive and hold a collapsible, deformable, liquid-filled reservoir bag, the housing including a first housing portion having a proximal interior surface and a second housing portion having a distal interior surface, the first and second housing portions being removably attachable to each other; a platen of magnetizable metal fixed to the distal interior surface; a guide member extending distally into the interior chamber from the proximal interior surface, and having a distal end formed as an enlarged-diameter head with a proximal surface; a magnet carrier disposed concentrically around the guide member and having flat distal surface surrounding a central aperture that is larger than the diameter of the guide member and smaller than the diameter of the head, the magnet carrier being axially movable on the guide member between a first position of maximum distance from the platen and a second position of minimum distance from the platen; a magnet fixed to the distal surface of the magnet carrier and having a central aperture with a diameter that is larger than the diameter of the head; and a spring, disposed concentrically around the guide member and seated between the distal surface of the magnet carrier and the proximal surface of the head, that biases the magnet toward the first position. - View Dependent Claims (29, 30)
-
Specification