Platen pump
First Claim
1. An infusion pump for expelling fluid from a fluid bag having an outlet, comprising:
- a base having a bag-engaging inner surface for supporting said fluid bag, said base having a substantially continuous side wall extending away from said bag-engaging inner surface, said side wall having a port configured to accommodate a fluid delivery tube of said bag;
a cover cooperating with said base to define a space in which said bag may be positioned, said cover configured such that it may be selectively connected to said base;
a pressure plate movably connected to said cover and moveable from a first position in which a bag-engaging surface of said pressure plate is located a first distance above said inner surface of said base to a second position in which said bag-engaging surface of said pressure plate is located a second distance nearer said inner surface of said base than said first distance, said bag-engaging surface of said pressure plate being complementary to said bag-engaging inner surface of said base, said pressure plate connected to said cover by an assembly comprising a linkage, a shaft having a first end and a second end, a pair of slides movable along said first and second shafts, and a spring mounted between each of said ends of said shaft and said slides, said linkage having a parallelogram shape formed by four arms, said arms rotatably connected to said slides and rotatably connected to said pressure plate and said cover; and
a fluid level indicator arrangement comprising a view window within said side wall of said base and encompassing both said first and second positions of said pressure plate such that a fluid level within said fluid bag may be determined from external said infusion pump.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is an infusion pump for expelling a fluid from a collapsible fluid reservoir to a patient. The pump includes a housing having a chamber therein for receiving the fluid reservoir. A first wall is provided on the housing for contacting the fluid reservoir, and a second wall is movable from a first position distanced from the first wall to form the chamber therebetween, and a second position relatively closer to the first wall. Advancing the movable wall from the first position to the second position expels fluid from the collapsible reservoir at a substantially constant rate by applying increasing force on the fluid reservoir through the dispensation cycle. Preferably, the first and second walls are provided with non-planar complementary surface configurations for contacting the collapsible reservoir. Retraction mechanisms for retracting the movable wall from the second position to the first position, and user readable indicium of the status of the dispensation cycle are also disclosed.
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Citations
8 Claims
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1. An infusion pump for expelling fluid from a fluid bag having an outlet, comprising:
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a base having a bag-engaging inner surface for supporting said fluid bag, said base having a substantially continuous side wall extending away from said bag-engaging inner surface, said side wall having a port configured to accommodate a fluid delivery tube of said bag; a cover cooperating with said base to define a space in which said bag may be positioned, said cover configured such that it may be selectively connected to said base; a pressure plate movably connected to said cover and moveable from a first position in which a bag-engaging surface of said pressure plate is located a first distance above said inner surface of said base to a second position in which said bag-engaging surface of said pressure plate is located a second distance nearer said inner surface of said base than said first distance, said bag-engaging surface of said pressure plate being complementary to said bag-engaging inner surface of said base, said pressure plate connected to said cover by an assembly comprising a linkage, a shaft having a first end and a second end, a pair of slides movable along said first and second shafts, and a spring mounted between each of said ends of said shaft and said slides, said linkage having a parallelogram shape formed by four arms, said arms rotatably connected to said slides and rotatably connected to said pressure plate and said cover; and a fluid level indicator arrangement comprising a view window within said side wall of said base and encompassing both said first and second positions of said pressure plate such that a fluid level within said fluid bag may be determined from external said infusion pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification