Blocking condition detection device in a fluid injection system
First Claim
Patent Images
1. A fluid injection system comprising:
- a flexible conduit;
supply means for supplying a pressurized fluid through said flexible conduit;
movable means to force the flexible conduit in a stressing direction said movable means including a spring means and a movable element wherein said spring means provides a stress via said movable element to cause creep in said flexible conduit; and
blocking condition detection means comprising a coil means and core means to form a resonance circuit for detecting whether or not the flexible conduit is forced in an anti-stressing direction opposed to said stressing direction thereby indicating that a blocking condition has developed in said flexible conduit, wherein movement of said movable means is detected in terms of the change of a resonance frequency, said resonance frequency increasing when the movable means stresses the flexible conduit to create a creep condition in said conduit and said resonance frequency decreasing when the movable means is forced in said anti-stressing direction separated from the flexible conduit.
1 Assignment
0 Petitions
Accused Products
Abstract
A medical fluid injection system comprises a flexible conduit, a supply device, a movable element, and a blocking condition detection device. The supply device supplies a pressurized medical fluid through the flexible conduit. The movable element is moved for forcing the flexible conduit in a stressing direction to cause creep in the flexible conduit. The blocking condition detection device detects whether or not the flexible conduit is forced in an anti-stressing direction opposed to the stressing direction. In a specific form of the present invention, a monitor may be provided for monitoring whether the movable element is exactly moved or not.
-
Citations
8 Claims
-
1. A fluid injection system comprising:
-
a flexible conduit; supply means for supplying a pressurized fluid through said flexible conduit; movable means to force the flexible conduit in a stressing direction said movable means including a spring means and a movable element wherein said spring means provides a stress via said movable element to cause creep in said flexible conduit; and blocking condition detection means comprising a coil means and core means to form a resonance circuit for detecting whether or not the flexible conduit is forced in an anti-stressing direction opposed to said stressing direction thereby indicating that a blocking condition has developed in said flexible conduit, wherein movement of said movable means is detected in terms of the change of a resonance frequency, said resonance frequency increasing when the movable means stresses the flexible conduit to create a creep condition in said conduit and said resonance frequency decreasing when the movable means is forced in said anti-stressing direction separated from the flexible conduit. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A detection system for detecting a blocking condition in a flexible conduit through which a pressurized fluid is supplied, said detection system comprising:
-
a movable means to force said flexible conduit in a stressing direction, said movable means including a spring means and a movable element wherein said spring means provides a stress via said movable element to cause creep in said flexible conduit; and blocking condition detection means comprising a coil means and core means to form a resonance circuit for detecting whether or not said flexible conduit is forced in an anti-stressing direction opposed to said stressing direction, thereby indicating that a blocking condition has developed in said flexible conduit. - View Dependent Claims (7, 8)
-
Specification