Non-invasive multi-function sensor system

• US 20090078047A1
• Filed: 09/21/2007
• Published: 03/26/2009
• Est. Priority Date: 09/21/2007
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Holdings Incorporated (Fresenius SE & Co. KGaA), Measurement Specialties, Inc. (France) (TE Connectivity Limited)
• Original Assignee: Cosense, Inc. (TE Connectivity Limited)
• Inventors: Dam, Naim
• Granted Patent: US 7,661,294 B2
• Time in Patent Office: Days
• US Class Current: 73/606
• CPC Class Codes: A61M 1/3626 Gas bubble detectors
• CPC Class Codes: A61M 1/3639 Blood pressure control, pressure transducers specially adapted therefor
• 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 2205/3375 Acoustical, e.g. ultrasonic, measuring means
• CPC Class Codes: G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• CPC Class Codes: G01N 2291/022 Liquids
• CPC Class Codes: G01N 2291/02433 Gases in liquids, e.g. bubbles, foams
• CPC Class Codes: G01N 2291/02466 Biological material, e.g. blood
• CPC Class Codes: G01N 29/02 Analysing fluids using acoustic emission techniques G01N29/14 ; constructional or flow details for analysing fluids G01N29/222; optoacoustic fluid cells G01N29/2425
• CPC Class Codes: G01N 29/222 Constructional or flow details for analysing fluids optoacoustic fluid cells G01N29/2425
• CPC Class Codes: G01N 29/2437 Piezoelectric probes

Abstract

An integrated multi-function sensor system has a head having a slot to accept a tube of a deformable material and a plurality of sensor elements mounted in the walls of the head slot to confront a tube in the slot, each sensor element being for affecting sensing of a condition relating to a liquid in the tube. An integrated electronic circuit including a microprocessor operates to determine the various conditions of a liquid flowing in the tube sensed by the sensor elements, which conditions include detection of air bubbles and/or particles by ultrasonic sensing elements, detection of an occlusion in the liquid flow by sensing the deformation of the tube wall by a force sensing element, determining the temperature of the liquid by an infrared temperature sensing element, and determining the color of the liquid by optical elements.

Claims

1. An integrated multi-function sensor system comprising:

a head having a slot to accept a tube of a deformable material;

a plurality of sensor elements mounted in said head to confront a tube in said slot, each said sensor element for affecting sensing of a condition relating to a liquid in the tube; and

an electronic circuit to which said plurality of sensor elements are connected to provide a measurement of the condition sensed by each of said plurality of sensor elements.

2. An integrated multi-function sensor system as claimed in claim 1 wherein all of said sensor elements performs its respective sensing function while being located outside of the wall of a tube in said slot.

3. An integrated multi-function sensor system as claimed in claim 2 wherein said plurality of sensors comprise:

a pair of piezoelectric elements mounted opposing each other on the side walls of said slot to contact the outer wall of a tube in the slot; and

a force sensor mounted on one wall of said slot to contact the outer wall of a tube in said slot; and

wherein said electronic circuit comprises;

a microprocessor;

an air bubble and particle detection circuit controlled by said microprocessor to supply ultrasonic energy to one of said piezoelectric sensor elements, to receive the ultrasonic energy transmitted though the tube, and to determine from the received energy the presence of air bubbles and/or particles in liquid flowing in a tube in the slot; and

a force detection circuit controlled by said microprocessor to determine from a change in deformation of a tube in said slot a change in pressure of a liquid flowing in the tube which indicates an occlusion of the liquid flow.

4. An integrated multi-function sensor system as claimed in claim 3 wherein said force detection circuit also acts to determine the presence or absence of a tube in said slot.

5. An integrated multi-function sensor system as claimed in claim 3 wherein said plurality of sensor elements further comprise:

an infrared temperature sensor element that projects a beam of infrared energy into a tube in said slot; and

a light emitting element mounted on one wall of the slot to transmit light into the interior of a tube in the slot and a light receiving element on the opposing wall of said slot to receive the light passing trough the tube; and

wherein said electronic circuit further comprises;

a temperature sensing circuit responsive to the infrared energy sensed by said infrared temperature sensing element to determine the temperature of the liquid flowing in a tube in said slot; and

a liquid type detection circuit responsive to the light received by said light receiving element to determine the color of the liquid flowing in a tube in said slot.

6. An integrated multi-function sensor system as claimed in claim 5 wherein said liquid type detection circuit also operates to determine the absence of a tube in said slot and/or the presence of liquid flowing in the tube.

7. An integrated multi-function sensor system as claimed in claim 3 wherein said electronic circuit further comprises a multiplexer controlled by timing signals to separately actuate each of said air bubble and/or particle detection circuit and said force sensing circuit.

8. An integrated multi-function sensor system as claimed in claim 5 wherein said electronic circuit further comprises a multiplexer controlled by timing signals to separately actuate each of said air bubble and/or particle detection circuit, said force sensing circuit, said temperature sensing circuit and said liquid type detection circuit.

9. A sensor head for an integrated multi-function sensor system comprising:

a head having a slot to accept a tube of a deformable material; and

a plurality of sensor elements mounted in said head to confront a tube in said slot, each said sensor element for affecting sensing of a condition relating to a liquid in the tube.

10. A sensor head as claimed in claim 9 wherein said head is made of a transparent plastic material.

11. A sensor head as claimed in claim 9 wherein said plurality of sensors comprise:

a pair of piezoelectric elements mounted opposing each other on the side walls of said slot to contact the outer wall of a tube in the slot; and

a force sensor mounted on one wall of said slot to contact the outer wall of a tube in said slot.

12. A sensor head as claimed in claim 9 wherein said plurality of sensors comprise:

an infrared temperature sensor element that projects a beam of infrared energy into a tube in said slot; and

a light emitting element mounted on one wall of the slot to transmit light into the interior of a tube in the slot and a light receiving element on the opposing wall of said slot to receive the light passing trough the tube.

13. A sensor head as claimed in claim 12 wherein said plurality of sensors further comprise:

an infrared temperature sensor element that projects a beam of infrared energy into a tube in said slot; and

a light emitting element mounted on one wall of the slot to transmit light into the interior of a tube in the slot and a light receiving element on the opposing wall of said slot to receive the light passing trough the tube.