Claims
- 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.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of application Ser. No. 09/826,430, filed on Apr. 3, 2001, which is a continuation-in-part of application Ser. No. 09/721,427, filed on Nov. 22, 2000, which claims priority to Provisional Application Serial No. 60/167,309, filed on Nov. 24, 1999, the disclosures of which are incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
|
60167309 |
Nov 1999 |
US |
Continuations (1)
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Number |
Date |
Country |
Parent |
09826430 |
Apr 2001 |
US |
Child |
10353081 |
Jan 2003 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09721427 |
Nov 2000 |
US |
Child |
09826430 |
Apr 2001 |
US |