Obstruction detector for a fluid flow line of a medical laboratory instrument

• US 5,451,373 A
• Filed: 02/16/1994
• Issued: 09/19/1995
• Est. Priority Date: 02/16/1994
• Status: Expired due to Fees

• Current Assignee: AKZO NV (Nouryon BV)
• Original Assignee: AKZO NV (Nouryon BV)
• Inventors: Moreno, Mario, Lewis, Gregory D., Keiter, Dean L.
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): TRAN, LIEN THUY
• Application Number:
  US08/197,762
• Time in Patent Office: 580 Days
• Field of Search: 422/81, 422/82.13, 422/44, 422/103, 422/104, 422/73, 436/50, 436/48, 436/52, 436/55, 436/148, 73/37, 73/49.5, 73/49.6, 73/49.8
• US Class Current: 422/82.13
• CPC Class Codes: G01L 9/0001 Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means G01L9/0026, G01L9/0033, G01L9/0082, G01L9/0089, G01L9/0091 take precedence
• CPC Class Codes: G01N 2035/1018 Detecting inhomogeneities, e.g. foam, bubbles, clots
• CPC Class Codes: G01N 35/1016 Control of the volume dispensed or introduced
• CPC Class Codes: Y10T 436/114165 with step of insertion or removal from test line
• CPC Class Codes: Y10T 436/117497 with a continuously flowing sample or carrier stream
• CPC Class Codes: Y10T 436/12 Condition responsive control

Abstract

An apparatus for detecting obstructions of a flow line. A detector housing is provided having a cavity therein. The detector housing has first and second openings into the cavity. The flow line is attached to the detector housing establishing a flow path through the first opening, the cavity, and the second opening, respectively. A pressure detector detects changes in pressure within the cavity, indicating the presence of an obstruction.

Claims

1. An apparatus for detecting obstructions of a flow line, comprising:

a cylindrically-shaped essentially solid detector housing defining a concentric cavity integrally formed therein, said detector housing having first and second openings into said cavity;

means for attaching the flow line to said detector housing whereby said first opening, said cavity, and said second opening, respectively, establish a flow path; and

pressure detection means comprising a piezo-electric element located directly on an exterior surface of said detector housing in an area corresponding to said cavity for detecting changes in pressure within said cavity.

2. The apparatus as defined in claim 1, wherein said detector housing consists of first and second housing portions connected to each other in a leak-proof manner.

3. The apparatus as defined in claim 2, wherein said first housing portion threads onto said second housing portion to form said detector housing.

4. The apparatus as defined in claim 1, wherein said cavity has first and second conically shaped end regions corresponding to said first and second openings and a cylindrically shaped central region therebetween, each said first and second end region tapering outward in a direction away from the respective opening and towards said central region.

5. The apparatus as defined in claim 1, wherein said detector housing has an inside diameter at each said opening of about 0.05 inches.

6. The apparatus as defined in claim 1, wherein said detector has an inside diameter at each said opening corresponding generally to about the inside diameter of the flow line.

7. The apparatus as defined in claim 1, wherein said pressure detection means detects a time rate of change in pressure.

8. An apparatus for detecting obstructions of a flow line, comprising:

a cylindrically-shaped essentially solid detector housing defining an integrally formed, concentric cavity having first and second conically shaped end regions and a cylindrically shaped central region therebetween, each said first and second end region tapering outward in a direction towards said central region, said housing including first and second openings in communication with said first and second end regions;

means for attaching the flow line to said detector housing whereby said first opening, said cavity, and said second opening, respectively, establish a flow path; and

pressure detection means for detecting changes in pressure within said cavity.

9. The apparatus as defined in claim 8, wherein said cylindrically shaped central region has a diameter of about 0.5 inches.

10. The apparatus as defined in claim 8, wherein said pressure detection means comprises a piezo-electric tape wrapped circumferentially around the exterior of said detector housing in an area corresponding to said central region.

11. An apparatus for detecting obstructions of a flow line, comprising:

a cylindrically-shaped essentially solid detector housing defining a concentric cavity integrally formed therein, said detector housing having first and second openings into said cavity;

means for attaching the flow line to said detector housing whereby said first opening, said cavity, and said second opening, respectively, establish a flow path; and

pressure detection means including a piezo-electric tape wrapped circumferentially around said detector housing in an area corresponding to said cavity for detecting changes in pressure within said cavity.

12. An apparatus for detecting obstructions of a flow line, comprising:

a cylindrically-shaped essentially solid detector housing defining a concentric cavity integrally formed therein, said detector housing having first and second openings into said cavity;

means for attaching the flow line to said detector housing whereby said first opening, said cavity, and said second opening, respectively, establish a flow path; and

pressure detection means comprising a piezo-electric element located directly on an exterior surface of said detector housing in an area corresponding to said cavity for measuring a microstrain of said housing corresponding to a change in pressure within said cavity.