Patents Assigned to Imed Corporation
  • Patent number: 5601445
    Abstract: A connector for structurally and electronically interconnecting modular electronic components which permits as single connection to provide both electrical communication and structural support between the modular components is disclosed. The interconnector may be a separate component from the housing for the electronic components or may be integrated therein.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: February 11, 1997
    Assignee: IMED Corporation
    Inventors: Jeffery D. Schipper, David R. Williams
  • Patent number: 5453098
    Abstract: A device for holding an IV tube in a pumping apparatus and for selectively occluding the tube when the door of the pumping apparatus is opened, to prevent free flow of fluid in the tube. The device consists of a base member to which the IV tube is attached or through which it passes, and a slide clamp which slides relative to the base member and relative to the tube. The IV tube is passed through an elongated aperture in the slide clamp, and the slide clamp is slidingly mounted on the base member. The aperture in the slide clamp has a relatively open hole at one end, through which the tube passes when the slide clamp is in one position, allowing fluid to flow through the tube. The aperture also has a relatively constricted slot at the other end, through which the tube passes when the slide clamp is in a second position, preventing fluid flow through the tube.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: September 26, 1995
    Assignee: Imed Corporation
    Inventors: Charles R. Botts, Robert B. Cushman, Ahmad-Maher M. Moubayed, John Thompson
  • Patent number: 5423746
    Abstract: A method for testing for patency at a venous access site during intravenous infusion of a medical solution includes the steps of occluding an intravenous injection tube upstream from the venous access site and monitoring the time and fluid pressure within the tube while the fluid pressure within the tube is varied by external contact with the tube. An apparatus for practicing the method of the invention includes a housing formed with a tube receiving portion for holding a portion of the tube in contact with an occluder finger, a fluid moving finger and a pressure transducer. The fluid moving finger is adapted to contact the tube so as to achieve a testing base pressure in the fluid, after occlusion by the occluder finger. A sequence of pressure drops are then effected by moving the fluid moving finger in stepped increments.
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: June 13, 1995
    Assignee: IMED Corporation
    Inventors: David H. Burkett, David E. Kaplan
  • Patent number: 5419770
    Abstract: A self priming tubing set for infusing a medical solution from an infusion device to a patient includes a supply tube, an air/particle filter, and a restrictor tube. The air/particle filter is adapted to remove air, particularly air contained in the supply tube at the initiation of fluid flow. The air/particle filter also removes particles from the medical solution. The restrictor tube is adapted to reduce the pressure of the medical solution from the delivery pressure of the infusion device to about a mean venous pressure of the patient. The length and inside diameter of the restrictor tube are calibrated to achieve a desired pressure drop dependent on design criteria of the system. The tubing set also includes a slide clamp for closing fluid flow from the supply tube and a connector for connection to a patient interface such as a hypodermic needle or cannula.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: May 30, 1995
    Assignee: Imed Corporation
    Inventors: Richard E. Crass, John S. Thompson
  • Patent number: 5368570
    Abstract: An IV infusion method and apparatus includes a plurality of fluid pumps mounted within a portable support housing and coupled to an IV tube. Each separate fluid pump is adapted to deliver fluid at a substantially constant delivery pressure predetermined by the characteristics of the pump. Each fluid pump includes an elastomeric membrane stretched into its region of nonlinear elasticity over a contour surface. Check valves located between the pumps and the IV tube control sequential dispensing of fluids from the pumps. The method and apparatus are especially adapted to a SASH process.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: November 29, 1994
    Assignee: Imed Corporation
    Inventors: John Thompson, Charles R. Botts
  • Patent number: 5290238
    Abstract: A self priming tubing set for infusing a medical solution from an infusion device to a patient includes a supply tube, an air/particle filter, and a restrictor tube. The air/particle filter is adapted to remove air, particularly air contained in the supply tube at the initiation of fluid flow. The air/particle filter also removes particles from the medical solution. The restrictor tube is adapted to reduce the pressure of the medical solution from the delivery pressure of the infusion device to about a mean venous pressure of the patient. The length and inside diameter of the restrictor tube are calibrated to achieve a desired pressure drop dependent on design criteria of the system. The tubing set also includes a slide clamp for closing fluid flow from the supply tube and a connector for connection to a patient interface such as a hypodermic needle or cannula.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: March 1, 1994
    Assignee: Imed Corporation
    Inventors: Richard E. Crass, John S. Thompson
  • Patent number: 5219330
    Abstract: An apparatus for infusing TPN fluids to a patient includes a source of fluid, a pump for infusing fluid from the source to the patient, and a computer for controlling the operation of the pump. During the operation of the apparatus the infusion rate of the pump is varied according to an infusion regimen that is based on the volume of fluid to be infused and the time during which the fluid is to be infused. This regimen is characterized by a trifurcated ramp up region having interrelated incremental rates of infusion which transition the pump from a zero rate of infusion to a steady state rate of infusion. The infusion regimen is also characterized by a period of steady state infusion which follows the ramp up region, and a ramp down region in which the infusion rate is decremented from the steady state rate based on the remaining volume of fluid to be infused to the patient and the remaining time for infusing this remaining volume of fluid.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: June 15, 1993
    Assignee: IMED Corporation
    Inventors: Stephen J. Bollish, Robert A. Bramble, Eric L. Firing
  • Patent number: 5219331
    Abstract: A pumping system is provided for administering a secondary treatment fluid to a patient intravenously in cooperation with a primary treatment fluid administration set already in place. The system includes a self-contained pumping unit having a pumping chamber and a secondary treatment fluid reservoir integral therewith. A secondary fluid line extending from the unit merges with a primary fluid line at a fitting for delivery of the fluids carried in the primary and secondary lines to the patient via a combined IV line.
    Type: Grant
    Filed: May 7, 1991
    Date of Patent: June 15, 1993
    Assignee: IMED Corporation
    Inventor: Timothy W. Vanderveen
  • Patent number: 5217355
    Abstract: A linear peristaltic pump for pumping fluid through a resilient tube has a pair of pumping fingers, a pair of pinching fingers, and a strain gauge to monitor pressure inside the tube. The first pumping finger squeezes the tube at a first location, and the second pumping finger squeezes the tube at a second location. Additionally, the first pumping finger is configured and operated to displace approximately twice the fluid volume displaced by the second pumping finger. The first pinching finger occludes the tube upstream to the first pumping finger and the second pinching finger occludes the tube between the first and second pumping fingers. To monitor dimensional changes in the outer diameter of the tube and thereby indicate pressure inside the tube, the strain gauge is mounted on the pump between the second pinching finger and first pumping fingers. Finally, a leaf spring and photoelectric sensor are associated with the first pumping finger to indicate when the finger is in its fully withdrawn position.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: June 8, 1993
    Assignee: IMED Corporation
    Inventors: Oscar E. Hyman, Ahmadmahir M. Moubayd, Larry L. Wilson
  • Patent number: 5213573
    Abstract: An apparatus for determining whether an IV infusion set has infiltrated the tissue of a patient includes a pump for pumping fluid through the IV set into the patient and a pressure transducer operably engaged with the IV set between the pump and patient. The pressure transducer is electrically connected to a microprocessor, and the microprocessor is electrically connected to the motor of the pump to control the pump to alternately withdraw from and infuse into the patient a predetermined volume of fluid.This predetermined volume of fluid is withdrawn from the patient by the pump at a preselected withdrawal pressure, while the pump infuses the predetermined volume of fluid into the patient at a preselected infusion pressure. The microprocessor measures both the time period for infusing the predetermined volume of fluid and the time period for withdrawing the predetermined volume of fluid. Based upon these time periods, the microprocessor evaluates whether the IV set has infiltrated the patient's tissue.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: May 25, 1993
    Assignee: IMED Corporation
    Inventors: Richard A. Sorich, David Burkett
  • Patent number: 5171301
    Abstract: An apparatus for infusing multiple fluid medicaments to a patient includes a base for supporting a plurality of pumping chambers. Each pumping chamber has a housing and a flexible membrane attached to the housing to establish a contractible fluid chamber between the housing and the membrane for holding a fluid medicament. Separate IV lines extend in fluid communication from each of the pumping chambers and each line is individually engageable with a flow controller which is mounted on the base. An electronic controller is mounted on the base and is operatively connected with each of the flow controllers to individually open each IV line at a predetermined time, and for a predetermined period of time, to establish a sequence for infusing fluids to the patient from the separate pumping chambers.
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: December 15, 1992
    Assignee: IMED Corporation
    Inventor: Timothy W. Vanderveen
  • Patent number: 5167631
    Abstract: A fluid pump for infusing medical fluids to a patient includes a housing having an inlet port and an outlet port. The housing further includes a substantially hemispherically shaped surface which is circumscribed by a periphery. An elastomeric membrane is attached to the periphery of the surface and is stretched over the surface to place the membrane in its region of nonlinear elasticity. With this combination, a potential fluid chamber is established between the surface of the housing and the stretched membrane.In operation, fluid is injected through the inlet port and into the potential chamber between the housing and the elastomeric membrane to fill the chamber with the desired medical fluid. A fluid line is connected to the outlet port of the pump and a flow restrictor is coupled with the fluid line to control the flow of fluid from the chamber. Fluid flows from the chamber as a result of the nonlinear contraction of the elastomer membrane.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: December 1, 1992
    Assignee: IMED Corporation
    Inventors: John Thompson, Giorgio di Palma, Charles R. Botts
  • Patent number: 5165873
    Abstract: A device for pumping fluid through a resilient tube has a platen for holding the tube and a pumping mechanism for squeezing the tube against the platen. The pumping mechanism includes a first pumping finger which squeezes the tube at a first location and a second pumping finger which squeezes the tube at a second location. For their respective alternating pumping actions, the first finger is configured and operated to displace approximately twice the fluid volume displaced by the second pumping finger. A valve means is also mounted on the base and is positioned to alternately occlude the tube upstream from the first and second pumping fingers during the pumping action of the first pumping finger and to occlude the tube between the first and second locations upstream from the second pumping finger during the pumping action of the second pumping finger.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: November 24, 1992
    Assignee: IMED Corporation
    Inventor: Robert S. Meijer
  • Patent number: 5092749
    Abstract: A drive mechanism for actuating the fingers of a peristaltic pump has a base, and a drive member reciprocally mounted on the base. A jointed arm is pivotally attached at one end to the drive member and at the other end to a fixed point on the base. A rotary cam actuator is mounted on the base to urge against the arm to reciprocate the drive member.
    Type: Grant
    Filed: May 7, 1990
    Date of Patent: March 3, 1992
    Assignee: Imed Corporation
    Inventor: Robert S. Meijer
  • Patent number: 5022422
    Abstract: A ball valve device for controlling fluid flow has a stainless steel ball positioned in the lumen of an I.V. tube. The outer diameter of the ball is equal to the inner diameter of the I.V. tube, so that the outer surface of the ball establishes a fluid seal with the inner surface of the tube. A latex sheath surrounds the tube in the proximity of the ball to provide resilience and memory for the tube. Inserts are positioned in the lumen both upstream and downstream from the ball to hold the ball in position under the sheath. Each insert is formed with a lumen for fluid flow, and has a tapered surface adjacent to the ball, which prevents the ball from forming a seal with the insert.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: June 11, 1991
    Assignee: IMED Corporation
    Inventor: Giorgio di Palma
  • Patent number: 5020562
    Abstract: A multiline check valve assembly has an elongated body which defines a fluid passageway and which is formed with a plurality of valve cavities that are in fluid communication with the fluid passageway. Each valve cavity has a resilient valve element disposed within the cavity and each valve element rests in the cavity with one end against a protrusion disposed in the cavity for centering the element within the cavity. The resilient valve element is biased to urge its other end against a valve seat that surrounds an opening to the valve cavity to create a fluid tight seal with the valve seat and close the opening. In addition, an access port is formed circumferentially around both the valve seat and opening to establish a fluid communication path through the access port to the fluid passageway in the body when the valve element is separated from the valve seat.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: June 4, 1991
    Assignee: IMED Corporation
    Inventors: Frank M. Richmond, Timothy Vanderveen, Rick Kimes
  • Patent number: D331108
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: November 17, 1992
    Assignee: IMED Corporation
    Inventor: Charles Curbbun
  • Patent number: D339193
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: September 7, 1993
    Assignee: Imed Corporation
    Inventors: John Thompson, Giorgio di Palma, Charles R. Botts
  • Patent number: D352778
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: November 22, 1994
    Assignee: IMED Corporation
    Inventors: Ronald D. Irvin, Richard A. Sorich
  • Patent number: D362062
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: September 5, 1995
    Assignee: Imed Corporation
    Inventors: Charles R. Botts, Bill Porter