US2003171712A1PendingUtilityA1

Injectors, injector systems and injector control

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Priority: Nov 24, 1999Filed: Jan 28, 2003Published: Sep 11, 2003
Est. expiryNov 24, 2019(expired)· nominal 20-yr term from priority
Inventors:Richard G. CritchlowMartin UramDavid A. MishlerRichard Anthony BatesRobert Doiron
A61M 5/007A61M 5/14546A61M 5/16854A61M 5/14566A61M 5/172A61M 5/1413A61M 2205/702
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PatentIndex Score
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References
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Claims

Abstract

An injector for use in injecting a fluid in a medical injection procedure includes a drive having a motor to pressurize the fluid; a sensor to provide a measure of fluid pressure; and a pressure monitor in communication with the sensor and the drive to stop the motor using 4-quadrant control when the sensor communicates a measured pressure of at least a pressure hazard limit. The pressure monitor also limits power input to the motor to a power limit once the sensor communicates a measured pressure of at least a power limiting pressure. The power limiting pressure is below the pressure hazard limit.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . An injector system comprising: 
 a syringe comprising a plunger movably disposed therein and containing a fluid;    a drive operably connected to the plunger of the syringe, the drive including a motor operable to pressurize the fluid;    a sensor to provide a measure of fluid pressure; and    a pressure monitor in communication with the sensor and the drive to stop the motor using 4-quadrant control when the sensor communicates a measured pressure of at least a pressure hazard limit, the pressure monitor also limiting power input to the motor to a power limit once the sensor communicates a measured pressure of at least a power limiting pressure, the power limiting pressure being below the pressure hazard limit.    
     
     
         2 . The injector system of  claim 1  wherein the power limit is predetermined for the injector.  
     
     
         3 . The injector system of  claim 1  wherein the power limit is set during operation of the injector when the power limit pressure is reached.  
     
     
         4 . The injector system of  claim 1  wherein the pressure hazard limit is set during operation of the injector.  
     
     
         5 . The injector system of  claim 1  wherein feedback from the sensor is used to perform a periodic recalibration.  
     
     
         6 . The injector system of  claim 1  wherein the sensor measures force upon a component of the drive.

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