Processor-controlled angiographic injector device

An angiographic injector device for infusing a contrast medium into the vascular system of a patient, comprising a syringe enclosing a reservoir holding the contrast medium therein and having a port from which the contrast medium is discharged, said syringe including piston means for discharging the contrast medium from the port in response to displacement thereof, drive means operatively connected to the piston means for effecting said displacement thereof, means for monitoring said displacement of the piston means to a limit position, signal generating means operatively connected to the monitoring means for producing a stop command signal in response to the piston means reaching said limit position during said displacement thereof, a stop member engagable by the piston means in the limit position thereof, controller means operatively connected to the stop member for selectively positioning said stop member to establish said limit position, and means operatively connected to the controller means and responsive to said stop command signal for disabling the drive means to prevent continued displacement of the piston means beyond the established limit position.

In a system for infusing contrast media from a syringe reservoir through a catheter into a vascular system of a patient by means of a plunger acting against load conditions dependent on plunger resistance, syringe reservoir volume, contrast media viscosity and catheter length and flow area, powered drive means operatively connected to the plunger for displacement thereof to effect infusion at a predetermined flow rate and pressure, servo means connected to said drive means for establishing said predetermined flow rate and pressure in accordance with a plurality of injection control parameters independent of said load conditions, means for selecting said injection control parameters pursuant to which the predetermined flow rate and pressure is established to controllably change the flow rates and pressures under which the contrast media is infused, and

• including mechanical stop means engagable by the plunger for limiting displacement thereof to a limit position and controller means operatively connected to the mechanical stop means and the servo means for establishing the limit position in accordance with a selected one of the injection control parameters.

In a system for infusing contrast media from a syringe reservoir through a catheter into a vascular system of a patient by means of a plunger acting against load conditions dependent on plunger resistance, syringe reservoir volume, contrast media viscosity and catheter length and flow area, powered drive means operatively connected to the plunger for displacement thereof to effect infusion at a predetermined flow rate and pressure, servo means connected to said drive means for establishing said predetermined flow rate and pressure in accordance with a plurality of injection control parameters independent of said load conditions, mechanical stop means engagable by the plunger for limiting displacement thereof to a limit position and controller means operatively connected to the mechanical stop means and the servo means for selectively establishing the limit position prior to said displacement of the plunger.

An angiographic injector device for infusing a contrast medium into the vascular system of a patient, comprising a syringe enclosing a reservoir holding the contrast medium therein and having a port from which the contrast medium is discharged, said syringe including piston means for discharging the contrast medium from the port in response to displacement thereof, drive means operatively connected to the piston means for effecting said displacement thereof, means for monitoring said displacement of the piston means to a limit position, signal generating means operatively connected to the monitoring means for producing a stop command signal in response to the piston means reaching said limit position during said displacement thereof, a stop member engagable by the piston means in the limit position thereof, controller means operatively connected to the stop member for positioning thereof to establish said limit position, means operatively connected to the controller means and responsive to said stop command signal for disabling the drive means to prevent continued displacement of the piston means beyond the established limit position, and interlock means for alternately enabling the drive means and the controller means to prevent operation of the drive means until said limit position is established by the controller means.

In a system for infusing contrast media from a syringe reservoir through a catheter into a vascular system of a patient by means of a plunger acting against load conditions dependent on a plunger resistance, syringe reservoir volume, contrast media viscosity and catheter length and flow area, powered drive means operatively connected to the plunger for displacement thereof to effect infusion at a predetermined flow rate and pressure, servo means connected to said drive means for establishing said predetermined flow rate and pressure in accordance with a plurality of injection control parameters independent of said load conditions, mechanical stop means engagable by the plunger for limiting displacement thereof to a limit position, controller means operatively connected to the mechanical stop means and the servo means for establishing the limit position prior to said displacement of the plunger, and interlock means for atlternatively enabling the drive means and the controller means to prevent said displacement of the plunger until said limit position is established through the controller means.

In a system for infusing contrast media from a syringe reservoir through a catheter into a vascular system of a patient by means of a plunger acting against load conditions such as those dependent on plunger resistance, syringe reservoir volume, contrast media viscosity and catheter length and flow area, powered drive means operatively connected to the plunger for displacement thereof to effect infusion at a predetermined flow rate and pressure, servo means connected to said drive means for establishing said predetermined flow rate and pressure in accordance with a plurality of injection control parameters independent of said load conditions, means for selecting said injection control parameters pursuant to which the predetermined flow rate and pressure is established to controllably change the flow rates and pressures under which the contrast media is infused, memory means for storing sets of said injection control parameters, means for producing an identification tag for association with each set of said injection control parameters and for storing said tags with said sets in said memory means, recall means responsive to a given one of the tags for recalling from said memory means an associated set of the injection control parameters to enable quick recall of routine sets of the injection control parameters without operator input prior to infusion.

In a system for infusing contrast media from a syringe reservoir through a catheter into a vascular system of a patient by means of a plunger acting against load conditions dependent on plunger resistance, syringe reservoir volume, contrast media viscosity and catheter length and flow area, powered drive means operatively connected to the plunger for displacement thereof to effect infusion at a predetermined flow rate and pressure, servo means connected to said drive means for establishing said predetermined flow rate and pressure in accordance with a plurality of injection control parameters independent of said load conditions, means for selecting said injection control parameters pursuant to which the predetermined flow rate and pressure is established to controllably change the flow rates and pressures under which the contrast media is infused, self-calibration means for producing a test command signal positioning said drive means at a test position, means for monitoring said drive means to detect the actual position thereof, means for comparing the test position with the actual position, and means for re-calibrating said drive means on the basis of said comparison.

In a system for infusing contrast media from a syringe reservoir through a catheter into a vascular system of a patient by means of a plunger acting against load conditions dependent on plunger resistance, syringe reservoir volume, contrast media viscosity and catheter length and flow area, powered drive means operatively connected to the plunger for displacement thereof to effect infusion at a predetermined flow rate and pressure, servo means connected to said drive means for establishing said predetermined flow rate and pressure in accordance with a plurality of injection control parameters independent of said load conditions, means for selecting said injection control parameters pursuant to which the predetermined flow rate and pressure is established to controllably change the flow rates and pressures under which the contrast media is infused, mechanical stop means engagable by the plunger for limiting displacement thereof to a limit position, controller means operatively connected to the mechanical stop means and the servo means for establishing the limit position in accordance with a selected one of the injection control parameters, and interlock means for alternatively enabling the drive means and the controller means to prevent said displacement of the plunger until said limit position is established through the controller means.

In a system for infusion of contrast media from a reservoir into a patient in response to discharge of the media from a port of the reservoir, including injection drive means for effecting said discharge of the media from the port, means for generating at least one injection control signal as a function of at least one injection parameter supplied thereto, means for monitoring at least one operational condition during said discharge of the media, servo control means operatively interconnecting the generating means, the monitoring means and the drive means for establishing said infusion of the media in accordance with said injection parameter under the monitored operational condition, said drive means including a media displacing piston and said monitored operational condition being the position of the piston, said servo control means including a stop member, a control motor operatively connected to the stop member, means for producing a stop command signal when the monitored position of the piston reaches a forward limit and means responsive to said stop command signal for actuating the control motor to advance the stop member whereby forward movement of the piston beyond said forward limit is mechanically prevented by the stop member.

In a system for infusion of contrast media from a reservoir into a patient in response to discharge of the media from a port of the reservoir, including injection drive means for effecting said discharge of the media from the port, means for generating at least one injection control signal as a function of at least one injection parameter supplied thereto, means for monitoring at least one operational condition during said discharge of the media, servo control means operatively interconnecting the generating means, the monitoring means and the drive means for establishing said infusion of the media in accordance with said injection parameter under the monitored operational condition, memory means for storing sets of said injection control parameters, means for producing an identification tag for association with each set of said injection parameters and for storing said tags with said sets in said memory means, recall means responsive to a given one of the tags for recalling from said memory means an associated set of the injection parameters to enable quick recall of routine sets of the injection parameters without operator input prior to infusion.