Device for detecting air in fluid conducting tubing
AssigneeDanby Medical Limited
InventorsHal C. Danby, Alan Brundle
Life of this patent
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Abstract
A device for detecting air in large bore thin walled transparent tubing, including a body providing accommodation for the tubing; an LED in a passage body for transmitting light energy towards the tubing; a phototransistor mounted in an orthogonally extending passage for receiving light transmitted by LED and modified by changes in the constituency of fluid passing through tubing; and an optical spacer in the form of a slotted collar of material optically matched to the material of tubing occupying space between LED and the tubing and phototransistor.
Claims25
A device for detecting the presence of air in translucent or transparent tubing, comprising:
- a body having a tubing accommodating passage providing accommodation for said tubing;
- a light energy transmitter for light transmitting light energy towards said tubing;
- a light energy receiver for receiving light energy transmitted by said transmitter and modified by changes in the constituency of fluid passing through said tubing;
- and
- an optical spacer having a circular cross-section and occupying space between said light energy transmitter and said tubing and said tubing and said light energy receiver in said tubing accommodating passage,
- wherein said light energy transmitter and said light energy receiver are located in passages extending through said body and opening into said tubing accommodating passage.
A device for detecting the presence of air in translucent or transparent tubing, comprising:
- a body providing accommodation for said tubing;
- a light energy transmitter for light transmitting light energy towards said tubing;
- a light energy receiver for receiving light energy transmitted by said transmitter and modified by changes in the constituency of fluid passing through said tubing;
- and
- an optical spacer occupying space between said light energy transmitter and said tubing and said tubing and said light energy receiver, comprising a cylindrical element having a dielectric constant greater than that of air, said element having a tubing passage extending along a longitudinal axis of the cylindrical element and in which said tubing is disposed in intimate contact with said cylindrical element.
Dependencies are inferred from the claim text.