Method for Correcting Medical Fluid Injection Pressures Based on Usage
First Claim
1. A medical fluid injector, comprising:
- a fluid container;
a motor for driving fluid from the fluid container; and
a motor drive control that;
delivers electrical energy to the motor;
measures the electrical energy delivered to the motor;
computes a pressure value of the fluid delivered from the fluid container based upon the electrical energy that is measured, wherein the pressure value is computed utilizing a calibrated relationship between the electrical energy delivered and fluid pressure;
tracks a time factor over an operative life of the motor; and
alters the calibrated relationship based upon the time factor.
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Accused Products
Abstract
Certain embodiments of the invention are directed to a medical fluid injector of the type that uses a motor to drive fluid from a fluid container by receiving electrical energy from a power source. The medical fluid injector has a motor drive control that delivers electrical energy to the motor. The motor drive control measures electrical energy delivered to the motor and computes a pressure value of the fluid delivered based upon the measured electrical energy. This pressure value is computed utilizing a calibrated relationship between the electrical energy delivered to the motor and resulting fluid pressure from the fluid delivered. The control further tracks a time factor over an operative life of the motor and alters the calibrated relationship based upon the time factor.
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Citations
20 Claims
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1. A medical fluid injector, comprising:
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a fluid container; a motor for driving fluid from the fluid container; and a motor drive control that; delivers electrical energy to the motor; measures the electrical energy delivered to the motor; computes a pressure value of the fluid delivered from the fluid container based upon the electrical energy that is measured, wherein the pressure value is computed utilizing a calibrated relationship between the electrical energy delivered and fluid pressure; tracks a time factor over an operative life of the motor; and alters the calibrated relationship based upon the time factor. - View Dependent Claims (2, 3, 4, 5, 6, 18, 19, 20)
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7. A method of adjusting a motor feedback current-verses-pressure relationship for a medical fluid injector, the method comprising:
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studying a sample size of individual specimens of a medical fluid injector type, the injector type comprising a motor drive control and a motor controlled by the motor drive control to inject fluid from a fluid container; forming a model of usage-related changes in efficiency of the injector type based upon parameters-of-usage; calibrating a motor drive control of a specific injector of the injector type, to compute injection pressure from electrical energy delivered to the motor; monitoring the parameters-of-usage of the specific injector; and recomputing the calibration of the motor drive control of the specific injector based upon the monitored parameters-of-usage utilizing the model formed for the injector type. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification