Injectors, injector systems and injector control
First Claim
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1. An injector for use in injecting a fluid in a medical injection procedure, the injector comprising:
- a drive including 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 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.
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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.
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Citations
13 Claims
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1. An injector for use in injecting a fluid in a medical injection procedure, the injector comprising:
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a drive including 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 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An injector system for use in injecting a fluid in a medical injection procedure, the injector comprising:
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a motor to pressurize the fluid;
a servo controller in communication with the motor;
a sensor including a force transducer to provide a measure of fluid pressure; and
a pressure monitor in communication with the sensor and the servo controller to stop the motor using 4-quadrant control when the sensor measures a pressure of at least a pressure hazard limit, the pressure monitor also limiting power input to the motor to a power limit when the sensor measures a pressure corresponding to a power limiting pressure, the power limiting pressure being below the pressure hazard limit. - View Dependent Claims (8)
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9. An injector system for use in injecting a fluid in a medical injection procedure, the injector system comprising:
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a motor to pressurize the fluid;
a servo controller in communication with the motor;
a sensor in communication with the servo controller including a force transducer to provide a measure of fluid pressure; and
a safety monitoring system in communication with the sensor, the safety monitoring system further being in communication with the servo controller, the safety monitoring system setting a pressure hazard limit and communicating the pressure hazard limit to the servo controller, the servo controller stopping the motor using 4-quadrant control when the sensor communicates a fluid pressure measurement of at least the pressure hazard limit. - View Dependent Claims (10)
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11. A method of controlling an injector system for use in a medical injection procedure, the method comprising the steps of:
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measuring a variable that is proportional to fluid pressure;
limiting power input to a motor of the injector to a power limit once the variable reaches a value corresponding to at least a power limiting pressure; and
stopping the motor using 4-quadrant control if the variable reaches a value corresponding to at least a pressure hazard limit, the pressure hazard limit being greater than the power limiting pressure. - View Dependent Claims (12, 13)
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Specification