Pumping device having improved emptying detection features
First Claim
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1. A device for holding a medical fluid comprising:
- a reservoir;
a movable wall configured to change a capacity of the reservoir;
an access port for communicating with the reservoir; and
a biasing means configured to apply a biasing force to the movable wall,wherein, when emptying the medical fluid from the reservoir,a constant phase applies a substantially constant pressure to the reservoir when the movable wall reduces the capacity of the reservoir until a predefined volume is reached, anda variable phase applies a variable pressure to the reservoir by the biasing force of the biasing means after the predefined volume is reached.
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Abstract
Sensor for dynamically detecting the residual fluid volume Vres of a collapsible reservoir (1,3) characterized by the fact that it is adapted to detect a threshold pressure Pth which corresponds to a phase within said reservoir (1,3) when only said residual fluid volume Vres remains, said residual volume Vres corresponding to a safety volume sufficient to ensure a safety margin to alert the user before the reservoir (1,3) is empty.
6 Citations
27 Claims
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1. A device for holding a medical fluid comprising:
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a reservoir; a movable wall configured to change a capacity of the reservoir; an access port for communicating with the reservoir; and a biasing means configured to apply a biasing force to the movable wall, wherein, when emptying the medical fluid from the reservoir, a constant phase applies a substantially constant pressure to the reservoir when the movable wall reduces the capacity of the reservoir until a predefined volume is reached, and a variable phase applies a variable pressure to the reservoir by the biasing force of the biasing means after the predefined volume is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A pumping device for delivering a fluid, the pumping device comprising:
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a reservoir including, a collapsible wall, an access port which communicates with an interior of the reservoir, and a biasing means configured to apply a biasing force on the collapsible wall, the biasing means configured to generate a behavior change of a pressure inside the reservoir when a predefined volume is reached; a pressure sensor; and a pumping system in communication with the reservoir through the access port. - View Dependent Claims (15, 16, 17, 18)
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19. A pumping device comprising:
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a reservoir having a main volume and a cavity, the reservoir defined by a rigid wall and a flexible wall; a filter; and an outlet; wherein the rigid wall includes the cavity that is in direct communication with the outlet and separated from the main volume of the reservoir by the filter, the cavity having a volume approximately equivalent to a residual volume Vres sufficient to ensure a safety margin to generate an alert before the reservoir is empty. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification