Cardiacassist, Inc

Cardiac Assist Technologies, Inc.

Yu, Yih-choung

Chiasson, John

Lehmann, Kirk A.

Griffin, Wayne P.

Kirk A Lehmann

Yih-Choung Yu

John C Marous, Iii

Zafiris G Zafirelis

Greg A Johnson

Wayne P Griffin

Gregory A Johnson

John Chiasson

John C Marous

John C Iii Marous

Greg A John

A method of providing a pumping system for assisting a human patient's heart and providing a blood pump to be disposed outside the patient's body is disclosed. The blood pump has an inlet and an outlet. An inlet cannula is provided for insertion percutaneously into the vascular system of the patient, and is adapted to be placed in fluid communication with the blood pump inlet to provide blood to the blood pump. An outlet perfusion cannula is provided for insertion percutaneously into the vascular system of the patient, and is adapted to be placed in fluid communication with the blood pump outlet to provide blood to the patient's vascular system. The blood pump includes a control system to control the blood pump. The control system includes at least two control units for redundant control of the blood pump, and each control unit includes a watchdog for monitoring the control unit.

Method and system for closed chest blood flow support

A pumping system for assisting a patient's heart includes a blood pump disposed outside the patient's body and having an inlet and an outlet. An inlet cannula is configured for insertion percutaneously into the vascular system of the patient, and in fluid communication with the blood pump inlet to provide blood to the blood pump. An outlet perfusion cannula is configured for insertion percutaneously into the vascular system of the patient, and in fluid communication with the blood pump outlet to provide blood to the patient's vascular system. A control system is provided to control the blood pump and includes at least two control units for redundant control of the blood pump. Each control unit includes a watchdog for monitoring the control unit. A variation of the pumping system includes a bidirectional cannula for insertion percutaneously into the vascular system of the patient and to extend into the patient's heart.

A system for assisting flow of blood by a patient's heart. The system includes a transseptal cannula adapted to be inserted percutaneously in the jugular vein and extend through the atrial septum from the right atrium to the left atrium. The system includes a blood pump mechanism having a blood pump for pumping blood received from the transseptal cannula that has been oxygenated at specified flow rates over a range of physiological pressures. The blood pump is connected to the transseptal cannula. The system includes a perfusion cannula adapted to be inserted percutaneously in the axillary artery for returning oxygenated blood to the atrial system of the patient. The perfusion cannula is connected to the blood pump. A method for assisting blood flow by a patient's heart. The method includes the steps of inserting percutaneously in the jugular vein of the patient and extending through the atrial septum from the right atrium to the left atrium a transseptal cannula. Next there is the step of inserting percutaneously in the axillary artery a perfusion cannula for returning oxygenated blood to the arterial system of the patient. Then there is the step of pumping blood with a blood pump connected to the transseptal cannula and the perfusion cannula at specified flow rates over a range of physiological pressures.

A system for assisting flow of blood by a patient's heart. The system includes a transseptal cannula adapted to be inserted percutaneously in the femoral vein and extend through the atrial septum from the right atrium to the left atrium. The system includes a blood pump mechanism having a blood pump for pumping blood received from the transseptal cannula that has been oxygenated at specified flow rates over a range of physiological pressures. The blood pump is connected to the transseptal cannula. The system includes a perfusion cannula adapted to be inserted percutaneously in the femoral artery for returning oxygenated blood to the atrial system of the patient. The perfusion cannula is connected to the blood pump. A method for assisting blood flow by a patient's heart. The method includes the steps of inserting percutaneously in the femoral vein of the patient and extending through the atrial septum from the right atrium to the left atrium a transseptal cannula. Next there is the step of inserting percutaneously in the femoral artery a perfusion cannula for returning oxygenated blood to the arterial system of the patient. Then there is the step of pumping blood with a blood pump connected to the transseptal cannula and the perfusion cannula at specified flow rates over a range of physiological pressures.

An apparatus for non-invasive flow indication through a rotary blood pump. The apparatus includes a blood pump adapted for implantation into a patient. The blood pump has a moving mechanism which contacts blood and imparts energy to the blood to move the blood in the patient at a desired flow rate. The apparatus a mechanism for causing the moving mechanism to move the blood. The causing mechanism is engaged with the moving mechanism. The causing mechanism receiving energy to power the causing mechanism. The apparatus comprises a sensorless flow indicator connected to the blood pump to identify the flow of blood through the pump based only on an energy balance between the energy imparted to the blood by the moving mechanism and the energy received by the causing mechanism. A method for determining blood flow in a patient. The method includes the steps of providing energy to a blood pump implanted in a patient to operate the pump. Then there is the step of imparting energy to blood in the patient with the blood pump at a desired flow rate. Next there is the step of identifying the flow rate only by balancing the energy imparted to the blood with energy provided to the pump.

Non-invasive flow indicator for a rotary blood pump

An apparatus for non-invasive flow indication through a rotary blood pump. The apparatus includes a blood pump adapted for implantation into a patient. The blood pump has a moving mechanism which contacts blood and imparts energy to the blood to move the blood in the patient at a desired flow rate. The apparatus includes a mechanism for causing the moving mechanism to move the blood. The causing mechanism is engaged with the moving mechanism. The causing mechanism receiving energy to power the causing mechanism. The apparatus comprises a sensorless flow indicator connected to the blood pump to identify the flow of blood through the pump based only on an energy balance between the energy imparted to the blood by the moving mechanism and the energy received by the causing mechanism. A method for determining blood flow in a patient. The method includes the steps of providing energy to a blood pump implanted in a patient to operate the pump. Then there is the step of imparting energy to blood in the patient with the blood pump at a desired flow rate. Next there is the step of identifying the flow rate only by balancing the energy imparted to the blood with energy provided to the pump.

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Library, PA, United States of America

Kirk A Lehmann