Motor control system for an automatic catheter inflation system
First Claim
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1. An automatic inflation device for a catheter system for use in a body lumen of a patient, comprising:
- a catheter having a proximal end and a distal end, and an inflatable member near said distal end;
an inflation lumen within said catheter for providing fluid communication between said proximal end and said inflatable member;
a pump adapted to pressurize fluid in said inflation lumen and said inflatable member, said pump having an associated movement speed and movement directions;
a pressure sensor adapted to measure fluid pressure in said inflatable member; and
a controller adapted to be programmed with a selected rate of fluid pressure change, that receives the measured pressure sensed by the pressure sensor and determines the actual rate of pressure change therefrom, that compares the actual rate of pressure change to the programmed selected rate of change and determines the difference, and that controls the speed of the pump to decrease said difference, whereby said inflatable member is inflated by fluid pressurized at the selected rate of pressure change.
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Abstract
A motor controller for providing a constant rate of change of pressure during inflation and deflation of an expandable member of a catheter for use in a body lumen by an automated inflation system is disclosed. The system conforms the rate of change of pressure to a set point value by means of a feedback loop controller, and makes possible consistent inflations and deflations using an automated system regardless of variations in catheter volume and compliance characteristics. Safety features such as maximum pressure and balloon rupture alarms are also disclosed.
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Citations
33 Claims
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1. An automatic inflation device for a catheter system for use in a body lumen of a patient, comprising:
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a catheter having a proximal end and a distal end, and an inflatable member near said distal end; an inflation lumen within said catheter for providing fluid communication between said proximal end and said inflatable member; a pump adapted to pressurize fluid in said inflation lumen and said inflatable member, said pump having an associated movement speed and movement directions; a pressure sensor adapted to measure fluid pressure in said inflatable member; and a controller adapted to be programmed with a selected rate of fluid pressure change, that receives the measured pressure sensed by the pressure sensor and determines the actual rate of pressure change therefrom, that compares the actual rate of pressure change to the programmed selected rate of change and determines the difference, and that controls the speed of the pump to decrease said difference, whereby said inflatable member is inflated by fluid pressurized at the selected rate of pressure change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An automatic inflation device for a catheter system for use in a body lumen of a patient, comprising:
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a catheter having a proximal end and a distal end, and an inflatable member near its distal end; an inflation lumen within said catheter for providing fluid communication between said proximal end and said inflatable member; a pump adapted to pressurize fluid in said inflation lumen and said inflatable member, said pump having an associated movement speed and movement directions; a pressure sensor adapted to measure fluid pressure in said inflatable member; and a controller adapted to be programmed with a selected rate of fluid pressure change, that receives the measured pressure sensed by the pressure sensor and determines the actual rate of pressure change therefrom, that compares the actual rate of pressure change to the programmed rate of change and determines the difference, and that controls the speed of said pump to decrease said difference, said controller also adapted to automatically control the pump to maintain a selected programmed pressure wherein the controller automatically controls the pump movement direction after reaching said selected programmable pressure to maintain said selected programmed pressure. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An automatic inflation device for an angioplasty catheter system for use in a body lumen of a patient, comprising:
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a catheter having a proximal end and a distal end, and an inflatable member near its distal end; an inflation lumen within said catheter for providing fluid communication between said proximal end and said inflatable member; a syringe pump in fluid communication with said inflation lumen and adapted to pressurize fluid in said lumen and said inflatable member, said syringe pump comprising a motor having an associated motor movement speed and movement directions; a fluid pressure transducer in fluid communication with said inflatable member, adapted to measure fluid pressure in said inflatable member and produce a pressure signal which is a function of the fluid pressure in the inflatable member; a motor movement sensor for monitoring said motor movement speed and providing a signal representative of said motor movement speed; and a feedback loop controller adapted to control a rate of change of fluid pressure within the inflation member in accordance with a programmed rate of pressure change by varying the motor speed and direction in response to a rate of change of pressure error signal derived by comparing a measured pressure in the inflatable member at a first sample time and a measured pressure at a second sample time separated by a predetermined time interval, the measured pressure being based upon the pressure signal, said feedback loop controller comparing the rate of change of pressure signal to the programmed rate of change of pressure and generating the error signal whereby said inflatable member is inflated by fluid pressurized at a rate of change of pressure that tracks closely the user programmed rate of change of pressure, wherein said controller receives said pump speed signal, compares it to the actual sensed rate of pressure change and provides an alarm based on said comparison. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification