Back to results
US 4,373,525 AGranted
Method and apparatus for detecting occlusion in fluid-infusion tube of peristaltic type fluid-infusion pump
AssigneeTerumo Kabushiki Kaisha
InventorSusumu Kobayashi
Life of this patent
Estimating the term…
Abstract
A change in the internal pressure of the fluid-infusion tube of a peristaltic fluid-infusion pump due to occlusion in the fluid-infusion tube is detected through a change in the diameter of the fluid-infusion tube. The occlusion is detected by detection of the change in the distance between the opposite wall portions of the tube.
Claims15
A method for detecting occlusion in a fluid-infusion tube of a peristaltic fluid-infusion pump, comprising:
- pressing respective wall portions of the fluid-infusion tube on inlet and outlet sides of the pump with substantially equal pressures during normal fluid infusing, by means of pressing means which includes a pair of pressing parts on a common movable member;
- detecting a change in the position of said common movable member of said pressing means, said change being a result of a change in the difference between a first distance and a second distance, said first distance being defined by the distance between opposite wall portions of the fluid-infusion tube at said inlet side and being a function of the fluid pressure in the inlet portion of the tube;
- and said second distance being defined by the distance between opposite wall portions of the tube at said outlet side and being a function of the fluid pressure in the outlet portion of the tube, the sum of said first and second distances always being constant;
- and
- detecting an occlusion in the fluid-infusion tube from said detected change in position.
2 more elements
An apparatus for detecting occlusion in a fluid-infusion tube of a peristaltic fluid-infusion pump comprising:
- a pair of stationary pieces respectively mounted adjacent said fluid-infusion tube at a fluid inlet portion and a fluid outlet portion of said fluid-infusion pump;
- a common movable member having a pair of pressing parts disposed respectively in opposition to said stationary pieces, said pressing parts being adapted to press the parts of said fluid-infusion tube which correspond to said fluid inlet and outlet portion of said pump, with a predetermined substantially equal pressure between said pressing parts and said respective associated stationary pieces during normal fluid infusing, said common movable member being adapted to be displaced corresponding to a change in a first distance between opposite wall portions of said fluid-infusion tube at said inlet portion thereof, and a change in a second distance at said outlet portion thereof, the sum of said first and second distances always being constant, said first and second distances being changed by a change in the internal pressure of said fluid-infusion tube caused by occlusion in said fluid-infusion tube;
- and
- means coupled to said common movable member for detecting said occlusion by detecting said displacement of said common movable member.
1 more element
Dependencies are inferred from the claim text.