Apparatus, methods and systems for dynamic ventricular assistance
OwnerRichard Wamplerinventor
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Abstract
Systems methods are disclosed for changing one or more characteristics (e.g. flow magnitude via pump speed) of mechanical circulatory assistance provided by an LVAD during specified points in the cardiac cycle, preferably using closed loop control. The system and method may be implemented for dynamically changing ventricular unloading during the cardiac cycle by adjusting the degree of ventricular assistance during systole and/or diastole. The system and methods also include a means to sense the phase of the cardiac cycle to inform the LVAD of timing within the cardiac cycle.
Claims35
An apparatus for providing mechanical circulatory assistance provided by an implanted left ventricular assist device (LVAD) pump, the apparatus comprising:
- (a) a processor;
- and
- (b) a non-transitory memory storing instructions executable by the processor;
- (c) wherein said instructions, when executed by the processor, perform steps comprising:
- (i) receiving data relating to a physiological parameter of a circulatory system in which the implanted LVAD pump is operating;
- (ii) identifying diastolic and systolic phases of the cardiac cycle of the circulatory system;
- and
- (iii) controlling the speed of the pump to have a different speed during the diastolic phase than during the systolic phase.
A method for providing mechanical circulatory assistance provided by a left ventricular assist device (LVAD) pump, the method comprising:
- installing an LVAD within a circulatory system of a patient;
- receiving data relating to a physiological parameter of the circulatory system;
- identifying diastolic and systolic phases of the cardiac cycle of the circulatory system;
- and
- controlling the speed of the pump to have a different speed during the diastolic phase than during the systolic phase.
The method of claim 17, wherein the specified intervals comprise periods of one or more of decreasing speed during the diastolic phase and increasing speed in the systolic phase to incrementally reduce assistance provided to the circulatory system by the pump.
A system for providing mechanical circulatory assistance to a patient, the system comprising:
- (a) a left ventricular assist device (LVAD) pump configured to be inserted into the patient's circulatory system;
- (b) a processor;
- and
- (c) a non-transitory memory storing instructions executable by the processor;
- (d) wherein said instructions, when executed by the processor, perform steps comprising:
- (i) receiving data relating to a physiological parameter of the circulatory system;
- (ii) identifying diastolic and systolic phases of the cardiac cycle of the circulatory system;
- and
- (iii) controlling the speed of the pump to have a different speed during the diastolic phase than during the systolic phase.
Dependencies are inferred from the claim text.