Controlling plunger drives for fluid injections in animals
First Claim
1. A medical fluid injector comprising:
- a mount that accepts a syringe, wherein the mount comprises a magnet;
a plunger drive for moving a plunger of the syringe forward and rearward inside the syringe;
an electronic control circuit controlling the plunger drive; and
a hall effect sensor located adjacent the mount and connected to the control circuit, wherein the hall effect sensor is positioned to detect magnetic field from the magnet to identify the mount and is configured to deliver a first signal to the control circuit indicative of a magnetic field, and the control circuit is configured to respond to the first signal by altering an operating function of the injector.
5 Assignments
0 Petitions
Accused Products
Abstract
A computer-controlled injector of the type having a motor which advances and retracts a plunger located within a syringe housing toward and away from a nozzle located in the front of the syringe to inject fluid into or out of an animal subject. Manual motion is induced by operating a manual motion control; the operator can manipulate the control to indicate the desired direction and velocity of motion. The manual motion control also has a locking mode in which manual motion of the plunger will continue once initiated without requiring the operator to continue manipulating the manual motion control. The injector performs injections in accordance with one of several pre-programmed protocols, and automatically tracks the fluid volume remaining. The injector compensates for plunger extenders found in some partially pre-filled syringes by applying a stored offset value to the computed plunger position.
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Citations
52 Claims
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1. A medical fluid injector comprising:
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a mount that accepts a syringe, wherein the mount comprises a magnet; a plunger drive for moving a plunger of the syringe forward and rearward inside the syringe; an electronic control circuit controlling the plunger drive; and a hall effect sensor located adjacent the mount and connected to the control circuit, wherein the hall effect sensor is positioned to detect magnetic field from the magnet to identify the mount and is configured to deliver a first signal to the control circuit indicative of a magnetic field, and the control circuit is configured to respond to the first signal by altering an operating function of the injector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A medical fluid injector comprising:
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a mount that accepts a syringe; a plunger drive for moving a plunger of the syringe forward and rearward inside the syringe; an electronic control circuit controlling the plunger drive; and a hall effect sensor connected to the control circuit, wherein the mount comprises a magnet, and the hall effect sensor is positioned to detect a magnetic field from the magnet to identify the mount, and wherein the hall effect sensor is configured to deliver a first signal to the control circuit indicative of the magnetic field, and the control circuit is configured to respond to the first signal by altering an operating function of the injector. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A medical fluid injector comprising:
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a mount that accepts a syringe; a plunger drive for moving a plunger of the syringe forward and rearward inside the syringe; an electronic control circuit controlling the plunger drive; and a hall effect sensor located adjacent the mount and connected to the control circuit, wherein the hall effect sensor is configured to deliver a first signal to the control circuit indicative of a magnetic field, the control circuit is configured to respond to the first signal by altering an operating function of the injector, the first signal from the hall effect sensor identifies whether the mount is in an open condition or a closed condition. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A medical fluid injector comprising:
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a mount that accepts a syringe; a plunger drive for moving a plunger of the syringe forward and rearward inside the syringe, wherein the plunger drive comprises a motor, a drive ram, and a gear box for translating rotary motion generated by the motor to linear motion of the drive ram; an electronic control circuit controlling the plunger drive, wherein the control circuit comprises a current sensor detecting an electrical current delivered to the motor, the control circuit responsive to the current sensor to identify a pressure generated within the syringe; and a hall effect sensor located adjacent the mount and connected to the control circuit, wherein the hall effect sensor is configured to deliver a first signal to the control circuit indicative of a magnetic field, and the control circuit is configured to respond to the first signal by altering an operating function of the injector. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification