Patents Represented by Attorney, Agent or Law Firm Richard P. Beem
  • Patent number: 5938634
    Abstract: A variable pressure drive peritoneal dialysis system has a pneumatic pressure system for purging and controlling a flow of dialysate through a disposable dialysate cassette of a disposable dialysate delivery set. The pneumatic pressure system has a variable-opening flow proportional valve for supplying air at selected profiled pressure or vacuum to a pneumatic interface. The disposable dialysate cassette has a diaphragm pump actuable by the profiled air pressure or vacuum to move dialysate to and from a patient via the disposable dialysate delivery set at a desired profiled dialysate pressure.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: August 17, 1999
    Assignee: Baxter International Inc.
    Inventor: Warren J. Packard
  • Patent number: 5803888
    Abstract: An apparatus (31) and a method are disclosed for performing an operation upon multiple webs (51,53), including the feeding of multiple webs (51,53), the provision of a carrier (65) for assisting in moving the webs (51,53) along a predetermined path (83), the performance of an operation (69) upon the webs, the insertion of a carrier (65) between the webs (51,53), and the provision of a sealing device (71) for sealing the webs together to form a sealed portion (75) to cooperate with the carrier (65) for assisting in moving the webs (51,53). The carriers (65) are mounted on a conveyor (83) and each carrier (65) pushes against the sealed portion (75) to pull the webs (51,53), and the packages (41) formed therefrom in the direction of conveyor travel. The preferred carrier (65) has a shaped head on the end of a flat plastic blade.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: September 8, 1998
    Assignee: Baxter International Inc.
    Inventors: Dale R. Severs, David Frankenberger, Richard Williams, Michael Kemp
  • Patent number: 5690600
    Abstract: An apparatus (31) and a method are disclosed for temporarily separating multiple webs (51,53) while performing an operation (123,125,133) thereon, including the feeding of multiple webs (51,53), the provision of a retractable web separator (68) for temporarily separating the webs, the performance of an operation (123,125,133)) upon the webs, the provision of a gripping device (65) for gripping the webs and assisting in moving the webs (51,53) along a predetermined path (83), and the provision of a sealing device (71) for sealing the webs together to form a package seal (73). The retractable separators (68) are mounted on a conveyor (83) and each separator (68) in turn temporarily separates the webs (51,53), for insertion of a port (45), fitting or the like, whereupon the separator (68) may be retracted and the port (45) may be sealed into the packages (41) being manufactured. The preferred separator (68) has a shaped head (170) on the end of a reciprocating shaft (158).
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: November 25, 1997
    Assignee: Baxter International Inc.
    Inventors: Sungwook Yang, Dale R. Severs, David Frankenberger, Michael Kemp
  • Patent number: 5634896
    Abstract: Pumping mechanisms for performing peritoneal dialysis and the like employ a pumping mechanism comprising a diaphragm that operate in response to applied fluid pressure. Flexible tubing is attached to the pumping mechanism for carrying liquid to and from the patient's peritoneal cavity. An actuating station for pumping mechanism receives the pumping mechanism and attached tubing. A pressure transfer element conveys fluid pressure to the diaphragm for moving liquid through the cassette. An occluder element contacts and crimps closed the tubing attached to the cassette. A first reservoir inflates with positive fluid pressure for contacting the pressure transfer element to hold it in operative contact against the diaphragm. A second reservoir inflates with positive fluid pressure for contacting the occluding element to hold it away from crimping contact with the tubing. At least one of the first and second reservoirs also transports fluid pressure to the pressure transfer element for conveyance to the diaphragm.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: June 3, 1997
    Assignee: Deka Products Limited Partnership
    Inventors: Robert J. Bryant, Clement D. Bouchard, Dean Kamen, Richard Lanigan, Bradley D. Miller, Geoffrey P. Spencer, Douglas E. Vincent
  • Patent number: 5628908
    Abstract: Systems and methods for peritoneal dialysis establish flow communication between a patient's peritoneal cavity and a drain through a pump chamber having generally vertically spaced upper and lower regions andt a diaphragm. The systems and methods operate the pump chamber, with the upper and lower regions oriented generally vertically, by applying fluid pressure to the diaphragm. The systems and methods direct liquid to the patient's peritoneal cavity only from the lower region of the pump chamber. In this way, the improved systems and methods collect air in the upper region of the vertically oriented pump chamber, while isolating the patient's peritoneal cavity from air in the pump chamber.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: May 13, 1997
    Assignee: Deka Products Limited Partnership
    Inventors: Dean Kamen, Richard Lanigan, Douglas E. Vincent
  • Patent number: 5474683
    Abstract: Peritoneal dialysis systems and methods move liquid using a pump chamber that is operated in response to pneumatic pressure variations applied by a pump actuator. The systems and methods periodically measure air pressures in the actuator and an associated reference air chamber and derive from these a measurement of liquid volume moved through the pump chamber. The systems and methods minimize derivation errors by compensating for temperature differences among the pump chamber; the pump actuator; and the reference chamber.
    Type: Grant
    Filed: March 3, 1993
    Date of Patent: December 12, 1995
    Assignee: Deka Products Limited Partnership
    Inventors: Robert J. Bryant, Dean Kamen, Douglas E. Vincent
  • Patent number: 5466322
    Abstract: A method of making a peelable tube assembly (76,80,84,88) having a plurality of adjacent tube portions (62) joined by intermittent breakable webs (72) of plastic allowing the individual portions (62) to be peeled from the tube assembly, including providing a plurality of plastic tube portions (62) each having a tube wall (66) defining a flow passage (70). The tube portions (62) are aligned adjacent to one another in a die assembly (12) having compression channels (30). Narrow confined flow chambers (32) are defined between adjacent portions (62) of the tube walls (66), and between the ends of the tube walls (66). The tube portions (62) are radially compressed without occluding the flow passage (70). Small compressed portions of the tube walls (66) proximate the flow chambers (32) are heated and plasticized.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: November 14, 1995
    Assignee: Baxter International Inc.
    Inventor: John M. Munsch
  • Patent number: D445555
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: July 24, 2001
    Inventor: Wayne D. Hanson