Detector system for monitoring a fluid containing tube

• US 4,797,655 A
• Filed: 03/23/1987
• Issued: 01/10/1989
• Est. Priority Date: 03/24/1986
• Status: Expired due to Term

• Current Assignee: Gambro Lundia AB (Baxter International Inc.)
• Original Assignee: Gambro AB (Baxter International Inc.)
• Inventors: Orndal, Carl-Henry, Ericson, Bjorn-Inge, Gummesson, Bengt-Ake G.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US07/029,252
• Time in Patent Office: 659 Days
• Field of Search: 340/521, 340/522, 340/501, 340/500, 340/531, 340/870.28, 340/870.29, 340/612, 340/614, 340/615, 340/618, 340/619, 340/661, 340/603-606, 340/592, 340/686, 137/15.2, 137/38, 137/39, 137/100, 128/633, 128/634, 128/636, 128/645, 128/646, 128/664, 128/665, 128/DIG. 3, 128/13, 604/31, 604/65, 604/66, 604/50, 604/67, 604/122, 604/123, 604/253, 604/256, 250/336.1, 250/338, 250/347, 250/491.1, 250/492.1, 250/493.1, 250/495.1
• US Class Current: 340/521
• CPC Class Codes: A61M 1/3626 Gas bubble detectors
• CPC Class Codes: A61M 1/367 Circuit parts not covered by the preceding subgroups of group A61M1/3621
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/331 used as turbidity change detectors, e.g. for priming-blood or plasma-hemoglubine-interface detection
• CPC Class Codes: A61M 2205/3313 used specific wavelengths

Abstract

Apparatus for monitoring fluid flow in dialysis systems include a tube holder for mounting the tube at a predetermined location on a dialysis monitor, a transmitter for transmitting a signal such as ultraviolet light through that location, a receiver for receiving the signal after it has passed through that location, and a sensor for sensing whether the tube is mounted at that location and whether the fluid is contained within the tube in response to the signal received by the receiver.

Claims

1. Apparatus for monitoring a fluid flow system including a tube through which fluid is intended to flow comprising mounting means for mounting said tube at a predetermined location, transmitting means for transmitting a signal through said predetermined location, receiver means for receiving said signal after it has passed through said predetermined location, and sensing means comprising comparator means for comparing said signal received by said receiver means with a first predetermined reference signal for determining whether or not said tube is mounted at said predetermined location and with a second predetermined reference signal for determining whether or not said fluid is contained within said tube, whereby both said determinations can be made on the basis of the same signal received by said receiver means.

2. The apparatus of claim 1 wherein said signal comprises infrared light.

3. The apparatus of claim 1 wherein said fluid comprises first and second fluids, said first fluid having a lower transmitting property for said signal than said second fluid, and wherein said comparator means comprises dual comparator means for sensing whether said tube is mounted at said predetermined location and for determining whether either said first fluid or said second fluid is contained within said tube.

4. The apparatus of claim 3 wherein said first fluid comprises blood and said second fluid comprises a priming fluid, and wherein said comparator means comprises means for comparing said signal received by said receiver means with a first predetermined reference signal for determining whether or not said tube is mounted at said predetermined location and with a second predetermined reference signal for determining whether or not said first fluid or said second fluid is contained within said tube.

5. The apparatus of claim 4 including alarm means for actuating an alarm upon said sensing means sensing that said first fluid is contained within said tube.

6. The apparatus of claim 1 including a monitor, and wherein said mounting means, said transmitting means, and said receiving means are mounted on said monitor.

7. The apparatus of claim 6 including clamp means for clamping said tube so as to prevent said flow of said fluid therethrough, said clamping means being mounted on said monitor adjacent to said mounting means whereby said tube is automatically mounted on said clamping means when said tube is mounted at said predetermined location in said mounting means.

8. The apparatus of claim 4 including pump means for pumping said fluid through said tube, and actuation means for deactivating said pump upon said sensing means sensing that said tube is not mounted at said predetermined location, for temporarily actuating said pump for a predetermined period upon said sensing means sensing that said tube is mounted at said predetermined location or that said second fluid is contained within said tube, and for actuating said pump upon said sensing means sensing that said first fluid is contained within said tube.

9. The apparatus of claim 6 wherein said transmitting means comprises conducting means for conducting said signal through said predetermined location in a direction outwardly from said monitor, and wherein said receiver means includes refractor means for refracting said signal back towards said monitor.

10. The apparatus of claim 9 wherein said mounting means comprises a generally circular passage for said tube, and including securing means for securing said tube in said generally circular passage.

11. The apparatus of claim 10 wherein said securing means comprises slot means for providing access to said generally circular passage, said slot means having a width smaller than the width of said tube.

12. The apparatus of claim 1 wherein said transmitting means comprises means for transmitting said signal in a defined form.

13. The apparatus of claim 12 wherein said defined form comprises a pulse train of a predetermined frequency.

14. The apparatus of claim 13 including comparative means for comparing said signal received by said receiver means with said signal in order to detect interference therein.

15. The apparatus of claim 1 including computer means for providing said signal for transmission by said transmitting means, and secondary computer means for providing said first and second predetermined reference signals.