Platen pump

• US 7,083,068 B2
• Filed: 03/24/2005
• Issued: 08/01/2006
• Est. Priority Date: 01/24/1992
• Status: Expired due to Term

• Current Assignee: BMR Medical, Ltda.
• Original Assignee: I-Flow Corporation (Kimberly-Clark Corporation)
• Inventors: Judge, Orvile L., Rake, Kenneth W., Earhart, Donald M., McPhee, Charles J.
• Primary Examiner(s): Kaufman, Joseph A.
• Application Number:
  US11/088,672
• Publication Number:
  US 20050211725A1
• Time in Patent Office: 495 Days
• Field of Search: 222/92, 222/95, 222/103, 222/386, 222/157, 128/DIG.12, 128/DIG.13, 604/31, 604131-135, 604140-143, 604145-147, 604/150, 604/151, 604153-155, 604/214, 604/216, 604/218, 604225-228, 604/232, 604/890.1, 604/891.7
• US Class Current: 222/103
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 2209/045 for filling, e.g. for filling reservoirs
• CPC Class Codes: A61M 5/148 flexible, e.g. independent bagsA61M5/155 takes precedence
• CPC Class Codes: Y10S 128/12 Pressure infusion
• CPC Class Codes: Y10S 128/13 Infusion monitoring

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.

Claims

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. The infusion pump of claim 1, further comprising a series of graduation marks on said view window configured to correspond with a position of said bag-engaging surface of said pressure plate.

3. The infusion pump of claim 1, wherein said linkage comprises a first linkage positioned on a first side of said slides and further including four arms comprising a second linkage positioned on a second side of said slides opposite said first side.

4. The infusion pump of claim 1, wherein a first and second of said arms are mounted to a first pin engaging said cover and a third and fourth of said arms are mounted to a second pin engaging said pressure plate.

5. The infusion pump of claim 1, wherein said pins are rotatably received in pin receivers connected to said cover and pressure plate, respectively.

6. The infusion pump of claim 1, wherein said side wall of said base is generally cylindrical in shape.

7. The infusion pump of claim 6, further comprising a first set of threads on said cover and a second set of treads on said base such that said cover may be selectively coupled to said base via a threaded connection of said first and second set of threads.

8. The infusion pump of claim 1, further comprising a retraction mechanism configured to move said pressure plate from said second position toward said first position while said cover is connected to said base.