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Pressure control system for cardiac assist device
| Details |
Inventors: Freed, Paul S.; Psakhis, Michael;
Assignee: L. Vad Technology, Inc. (Detroit, MI)
Primary Examiner: Kamm; William E.
Assistant Examiner:
Attorney, Agent or Firm: Young & Basile, P.C.
A control system for an inflatable chamber operably positionable with respect to an aorta of a patient monitors an actual flow duration time for inflating and/or deflating the inflatable chamber with a predetermined volume of pressurized fluid and compares the actual flow duration time to a target flow duration time. The system controls the fluid pressure in a high pressure reservoir, and/or in a vacuum reservoir, based on the results of the comparison. If the actual time for inflation is too short compared to the target time, the fluid pressure in the high pressure reservoir is reduced. If the actual time for inflation is too long compared with the target time, the fluid pressure in the high pressure reservoir is increased. If the actual time for deflation is too short compared to the target time, the vacuum in the vacuum reservoir is decreased. If the actual time for deflation is too long compared with the target time, the vacuum in the vacuum reservoir is increased. The incremental step change in fluid pressure within either reservoir can be controlled within predetermined minimum and maximum values, and/or based on the magnitude of the difference between the actual and target time intervals. The change in fluid pressure within either reservoir can be controlled by the system manipulating a control valve, or varying the speed of the compressor, or any combination of the two, until the new calculated value is reached within the reservoir. |
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DETAILED DESCRIPTION The invention provides a driving and control system for inflatable chambers, such as balloons and pumps for cardiac assist devices, by determining the inflation duration and adjusting the pressure stored in at least one reservoir accordingly.
The invention is applicable to a permanent blood pump that is sutured into the wall of the descending thoracic aorta, as well as a temporary balloon pump introduced into the aorta in the vicinity of the heart.
In the first configuration, a flexible internal fluid conduit is implanted in a patient and extends from an implanted internal permanent blood pump device to a percutaneous access device (PAD) implanted beneath and projecting through the patient's skin.
The PAD allows the implanted pump device to be operatively connected to or disconnected from an external gas handling means and control means.
In the second configuration, a temporary balloon pump can be inserted into the descending thoracic artery through the femoral artery of a patient's leg.
The temporary balloon pump has a relatively thin flexible tube extending externally of the patient through the incision in the patient's leg for connection to a drive means including an external fluid handling means and control means.
In either case, an elongated fluid conduit is provided and connected at one end to an inflatable member disposed within or connected to a patient's descending thoracic aorta and connectible to drive means for controlling inflation and deflation cycles of the inflatable member at an opposite end.
The control means measures arterial pressure of the patient for a specific number of heartbeats during a scheduled pressure measurement procedure.
The control means adjusts the inflation and deflation rates of the pump for subsequent heartbeats in accordance with a ventricle assist program stored in memory of the control means based on the arterial pressure measured during the scheduled pressure measurement.
The fluid handling means inflates and deflates the inflatable chamber or pumping bladder in accordance with the evaluation of the arterial pressure measured by the control means
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Heart Surgery 
