Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-06-16
1997-10-28
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 65, 604 67, 604153, A61M 3700
Patent
active
056812841
ABSTRACT:
An infusion pump for infusing solutions from IV bags through tubing to patients. The pump comprises a housing having a compartment which receives an IV bag in a solution-dispensing position. The bag is placed over a bladder within the compartment, and the bladder is expanded by a pressurized fluid to apply a pushing force against the bag which collapses to infuse solution through the tubing. A pump in the housing pumps a fluid such as air into the bladder under influence of a control circuit. A pressure sensor indirectly senses pressure of fluid in the bladder through a pressure of pad which contacts the bladder wall. A control circuit generates a pressure signal responsive to movement of the pressure pad for operating a valve which directs fluid between the pump and bladder. A dispensing spike is provided for interconnecting a dispensing port of the bag in fluid communication with the tubing. The spike is formed with an annulus which cooperates with a wall of the housing to prevent unintended withdrawal of the spike from a dispensing port while infusion takes place. The annulus also operates a switch which is connected in the control circuit to ensure that infusion proceeds only when the bag is in its proper solution-dispensing position in the housing.
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Racunas Robert V.
Rimell Sam
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