Source: http://www.google.com/patents/USRE39075?ie=ISO-8859-1&dq=7,403,220
Timestamp: 2015-07-03 09:23:35
Document Index: 10773622

Matched Legal Cases: ['application No. 08', 'application No. 08', 'application No. 08', 'application No. 07', 'application No. 07', 'application No. 06']

Patent USRE39075 - Heater for physiological fluids - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA self-contained portable unit for heating physiological fluids is disclosed. A heat exchanger is disposable to ensure sterility, and the hot exchanger is attached to a heating system by inserting it between opposed fluid connection elements. One of the fluid connection elements is movable to permit...http://www.google.com/patents/USRE39075?utm_source=gb-gplus-sharePatent USRE39075 - Heater for physiological fluidsAdvanced Patent SearchPublication numberUSRE39075 E1Publication typeGrantApplication numberUS 10/032,559Publication dateApr 18, 2006Filing dateJan 2, 2002Priority dateMay 27, 1986Also published asCA1271796A1, DE3751504D1, DE3751504T2, EP0247989A2, EP0247989A3, EP0247989B1, US4759749Publication number032559, 10032559, US RE39075 E1, US RE39075E1, US-E1-RE39075, USRE39075 E1, USRE39075E1InventorsWesley H. VerkaartOriginal AssigneeSmiths Medical Asd, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (17), Referenced by (3), Classifications (15), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetHeater for physiological fluids
US RE39075 E1Abstract
A self-contained portable unit for heating physiological fluids is disclosed. A heat exchanger is disposable to ensure sterility, and the hot exchanger is attached to a heating system by inserting it between opposed fluid connection elements. One of the fluid connection elements is movable to permit the heat exchanger to be installed and removed easily by inserting one end of the heat exchanger in one of the fluid connection units and moving the other fluid connection unit into contact with an opposite end of the heat exchanges. The heating fluid is heated by an electric heating element and is circulated by an electric pump.
first and second fluid connector means for removably receiving respective first and second warming fluid ports of a heat exchanger and for facilitating passage of a warming fluid, and support means for supporting said first and second fluid connector means, each of said fluid connector means comprising a passageway for passing said warming fluid and means for engaging a respective said first or second warming fluid port to allow said warming fluid in said passageway to communicate with said port and to physically support said heat exchanger in cooperation with the other of said fluid connector means, fluid circulation means for circulating said warming fluid to said first and second fluid connector means, and temperature control means for controlling the temperature of said warming fluid, wherein one of said first and second fluid connector means is movably mounted to said support means for movement with respect to said support means between at least first and second positions, wherein such that said first and second fluid connector means are spaced by a first distance for engaging engage said warming fluid ports when said one of said fluid connectors is in said first position and are spaced by a second distance for releasing release said warming fluid ports when said one of said fluid connectors is in said second position, wherein each of said means for engaging comprises means for removably receiving or releasing one of said warming fluid ports in a single mechanical action. 2. A combination according to claim 1 wherein said means for engaging removably receiving or releasing comprises means forming a recess for receiving a said fluid port.
12. A combination according to claim 11 wherein said heater means comprises an electrical fluid heating element, a storage tank containing said first warming fluid, and pump means for circulating said first warming fluid in a circuit including said heating element, said tank, and said central tube of said heat exchanger.
15. A sterile heat exchange for controlling the temperature of a physiological fluid comprising a central tube having high heat conductivity for carrying a temperature-controlled fluid, an outer tube shorter than said central tube and surrounding a part of said central tube to form a passageway for said physiological fluid between said central and outer tubes, and first and second end caps, each of said end caps having a first part extending axially along an outer surface of said outer tube and being sealed and secured to said outer surface and a second part sealingly engaging said central tube to ensure maintenance of sterility during operation, said second part comprising an elongate cylindrical opening engaging an outer surface of said central tube and extending away from said first part and wherein said inner tube extends beyond each of said second parts and forms two elongate connections for being slidingly received in an elongate recess.
16. A heat exchanger according to claim 15 19 wherein said central tube is of aluminum.
17. A heat exchanger according to claim 15 19 wherein said central tube has an exterior surface providing increased surface area.
19. A heat exchanger according to claim 15 A sterile heat exchanger for controlling the temperature of a physiological fluid comprising a central tube having high heat conductivity for carrying a temperature-controlled fluid, an outer tube shorter than said central tube and surrounding a part of said central tube to form a passageway for said physiological fluid between said central and outer tubes, and first and second end caps, each of said end caps having a first part extending axially along an outer surface of said outer tube and being sealed and secured to said outer surface and a second part sealingly engaging said central tube to ensure maintenance of sterility during operation, said second part comprising an elongate cylindrical opening engaging an outer surface of said central tube and extending away from said first part and wherein said inner tube extends beyond each of said second parts and forms two elongate connections for being slidingly received in an elongate recess, wherein each of said end caps includes a port for communicating a fluid to be warmed with said passageway.
first and second fluid connector means for removably receiving respective first and second warming fluid ports of a heat exchanger for receiving a warming fluid, and support means for supporting said first and second fluid connector means, each of said fluid connector means comprising a passageway for passing said warming fluid and means for engaging a respective said first or second warming fluid port to allow said warming fluid in said passageway to communicate with said port and to physically support said heat exchanger in cooperation with the other of said fluid connector means, fluid circulation means for circulating said warming fluid to said first and second fluid connector means, and temperature control means for controlling the temperature of said warming fluid, wherein one of said first and second fluid connector means is movably mounted to said support means for movement with respect to said support means between at least first and second positions, such that said first and second fluid connector means are spaced by a first distance for engaging said warming fluid ports when said one of said fluid connectors is in said first position and are spaced by a second distance for releasing said warming fluid ports when said one of said fluid connectors is in said second position, said means for engaging comprises means forming a recess for receiving a said fluid port, said recess includes an O-ring seal for preventing leakage of said warming fluid, and wherein said support means is elongated in a first direction, said one of said first and second connector means is mounted to said support means for linear movement in said direction toward or away from the other of said first and second connector means between said first and second positions, and said other of said first and second connector means is fixed with respect to said support means. 21. A combination according to claim 20 wherein said means for engaging comprises a cylindrical recess and wherein said cylindrical recess of said first fluid connector means is axially aligned with said cylindrical recess of said second fluid connector means.
This application is a continuation of application No. 08/758,853 filed Dec. 2, 1996, since abandoned, which is a continuation of application No. 08/571,706 filed Dec. 6, 1995, since abandoned, which is a continuation of application No. 08/145,099 filed Nov. 3, 1993, since abandoned, which is a continuation of application No. 07/979,434 filed Nov. 20, 1992, since abandoned, which is a continuation of application No. 07/558,177 filed Jul. 26, 1990, since abandoned, which is a reissue of application No. 06/866,910 filed May 27, 1986, U.S. Pat. No. 4,759,749.
In many medical procedures, it is necessary that fluids to be administered to a patient be heated. For example, whole blood and packed cells are stored in refrigerators at a temperature of approximately 4� C. These fluids often are required to be administered to a patient within a short period of time, which necessitates warming them to a temperature approximately equal to that of the patient, i.e. 37� C.
Great care must be exercised when heating fluids such as whole blood or packed cells to avoid damaging the cells. For example, it is generally accepted that whole blood and packed cells should not be exposed to a temperature above 44� C. This places a severe restriction on the techniques used to heat quickly fluids which have been stored in a refrigerator and which must be administered to a patient within a short period of time.
U.S. Pat. No. 2,910,981 (Wilson et at.) shows a device for conducting blood transfusions. A heat exchanger is in fluid communication with a heating element, and the blood to be ministered passes through the heat ex. changer before being administered to the patient. The heat exchanger comprises a central tube surrounded by an outer tube, and the heating fluid passes through the space between the inner and outer tubes. The heat ex. changer is threadedly connected to valves at opposite ends. No structure is described for supporting the various elements described in the patent.
The system may also include a filter which would be attached to an outlet of the heat exchanger. Sensors on the pole detect when the heat exchanger or the filter is in a correct place to control operation of the heating system. The heating system comprises a tank and a heating element in the outlet line of the tank. A pump circulates a heating fluid from the tank and heating element through the disposable heat exchanger.
FIG. 1 is an exploded view of a preferred embodiment of the invention. A base 2, which preferably has wheels for ease of mobility, supports a pole 4 and a heating unit 6. Pole 4 removably receives a disposable unit 8 which includes a heat exchanger 10 and a filter 12. Tube 14 is in fluid communication with one end of heat exchanger 10 and connects it to a pair of bags spikes 16. The bag spikes are known in the art and are used to puncture and allow the dispensing of a body fluid from a storage bag. Tube 18 connects a lower end of heat exchanger 10 to an upper end of filter 12 and tube 20 connects a lower end of filter 12 to cannula 22 to allow fluids to be introduced into a patient. As will be more fully described below, the entire unit 8 is manufactured of an inexpensive material and is disposable to ensure sterility.
Filter 12 is supported on pole 4 by U-shaped bracket 48. The distance between the legs of the bracket is slightly less than the diameter of the filter so that it “snaps” into place. Similarly, a U-shaped bracket 49 is located between connectors 36 and 38. Bracket 49 holds heat exchanger 10 aligned with connector 36 during insertion of the heat exchanger.
An outer tube 58 fits over the inner tube 50 in a central portion thereof The space between the helical central portion 56 and the outer tube 58 forms a helical path extending between opposite ends of outer tube 58.
It will be appreciated that heat exchanger 10 may be easily attached to pole 4 by inserting end 54 into fluid connector 38 and by lowering fluid connector 36 onto end $2 52. When this is accomplished, heat exchanger 10 will be supported mainly by fluid connectors 36 and 38.
With particular reference to FIG. 8, tank 96 includes an air vent and overflow tube 110, and a float switch 112. The float switch is in turn connected to a control circuit 114 to permit operation of the device only when sufficient fluid is present. Heater 94 comprises a tubular channel having an electric heating rod 116 therein, and the heating rod is connected to a temperature control circuit 118 which is in turn also connected to control circuit 114. As fluid flows from tank 96 through filter 98 and through heater 94, it is warmed, and the temperature is measured by temperature probe 120, _ which is located in the outlet of heater 94. Temperature control probe 120 is connected to temperature control circuit 118 to control energization of heating rod 116. A second temperature control probe 122 is also located in the outlet of heater 94 and is connected to control circuit 114 to ensure that the temperature does not exceed a predetermined level. If the temperature of the warming fluid is too high, the blood cells could be destroyed, and it is thus important either to automatically shut down the heating system or to activate an alarm such as that shown at 124.
In operation of the apparatus is accordance with the invention, the unit is rolled to a location adjacent to a patient, and a sterile unit 8 is installed between fluid connectors 36 and 38. Cannula 22 is attached to the patient, and bag spikes 16 are inserted into appropriate bags containing the desired fluid to be administered to the patient. Switch 130 is be warmed by the heat exchanger. If filter 12 has been placed in the circuit, the warmed body fluid then passes through the filter and into the patient. If filter 12 is not being used, tube 18 is connected directly to the cannula 22 for direct admission of the warm body fluid to the patient.
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