91 results about "Cardiac assist" patented technology

The invention relates to a method for determining a flow rate of a fluid flowing through an implanted vascular assist system, said method comprising the following steps: a) carrying out a first pulsed Doppler measurement at a first pulse repetition rate by means of an ultrasonic sensor of the assist system; b) carrying out a second pulsed Doppler measurement at a second pulse repetition rate by means of the ultrasonic sensor of the assist system, wherein the second pulse repetition rate differs from the first pulse repetition rate; c) determining the flow rate using measurement results of the first pulsed Doppler measurement and the second pulsed Doppler measurement.

The invention relates to a method for determining at least a flow velocity or a fluid volume flow of a fluid flowing through an implanted vascular support system, comprising the following steps: a) carrying out a pulsed Doppler measurement by means of an ultrasonic sensor of the support system, b) evaluating a measurement result from step a), which has a possible ambiguity, c) providing at least one operating parameter of a flow machine of the support system, d) determining at least the flow velocity or the fluid volume flow using the measurement result evaluated in step b), wherein the possible ambiguity of the measurement result is corrected using the operating parameter.

A cardiac assist device with an expandable cup (4) having a transport state and an operational state, the expandable cup comprising a plurality of inflow apertures (5), and an outflow nozzle (6), and an inflatable balloon (8) positioned inside the expandable cup (4). A catheter assembly (3) is connected to the inflatable balloon (8) during operation, and a control unit (2) is connected to the catheter assembly (3). The control unit (2) is arranged to operate the inflatable balloon (8) with a frequency of more than 100 beats per minute.

The utility model discloses a double-gas-path gas source system and a double-gas-path heart auxiliary system. The double-air-path heart assisting system comprises a pressure generating mechanism which alternately generates positive pressure and negative pressure when working; the first auxiliary device comprises first driven equipment and a first piping pipeline, a pipe body at the farthest end of the first piping pipeline is provided with an inflow channel and an outflow channel, and the first driven equipment is located in the pipe body of the first piping pipeline and corresponds to the outflow channel in position; the second auxiliary device comprises second driven equipment and a second piping pipeline communicated with the second driven equipment; the pressure generating mechanism enables the second driven device to repeatedly expand and contract through the second piping. The detection device is used for acquiring the pressure in the cardiac chamber and the pressure in the aorta; and the control mechanism is used for controlling the pressure generation mechanism to respectively drive the first driven equipment and the second driven equipment according to the corresponding time sequence in a cycle control period according to the pressure signal sent by the detection device.

A control device (100) for controlling the rotational speed (nVAD(t)) of a non-pulsatile ventricular assist device, VAD, (50) uses an event-based within-a-beat control strategy, wherein the control device is configured to alter the rotational speed of the VAD within the cardiac cycle of the assisted heart and to synchronize the alteration of the rotational speed with the heartbeat by at least one sequence of trigger signals (σ(t)) that is related to at least one predetermined characteristic event in the cardiac cycle. Further, a VAD (50) for assistance of a heart comprises the control device (100) for controlling the VAD, wherein the VAD is preferably a non-pulsatile rotational, for example catheter-based, blood pump.

A cardiac support system (20) is equipped with a retaining structure (30) for the cardiac support system, said retaining structure (30) being intended to fix the cardiac support system in place. The cardiac support system comprises a device for monitoring the integrity of the retaining structure (30).

A system and method for the installation and operation of a cardiac assist device. Flexible guides are advanced into a prepared space using minimally invasive techniques. A heart pump construct is advanced into position in the pericardial area along the flexible guides. Once in position, the heart pump construct is activated while still engaged with the flexible guides. The flexible guides provide structural integrity to the heart pump construct needed in order for the heart pump construct to function properly. The forces supplied to the heart by the heart pump construct are affected by the presence of the flexible guides. The structure of the flexible guides, the position of the flexible guides and the structure of the heart pump construct are customized to supply the forces needed by a particular heart in order to assist the heart in pumping more efficiently.

A cardiac assist system having a pumping device for moving blood, wherein a pumping capacity of the pumping device is adjustable using an adjustment signal based on laser doppler with an optical fiber. A measuring device measures a flow rate of the body fluid, the measuring device comprising at least one light source for outputting a light beam and at least one sensor element for detecting a reflected partial beam of the light beam. The measuring device is adapted to measure the body fluid using the reflected partial beam of the light beam. A determination device is adapted to determine the adjustment signal using the measurement signal. The device may include a bore opening to a blood flow channel, with an optical fiber extending through the bore.

A fluid controlled system for a cardiac assist device and its method of operation. The cardiac assist device has a cup assembly with a receptacle area. The cup assembly has at least one inflatable membrane that expands into the receptacle area. A single pressure tube connects the cup assembly to a fluid pump. A valve assembly is incorporated into the cardiac assist device. The valve assembly includes at least one valve that controls fluid flow between the inflatable membranes and the pressure tube and / or fluid flow between the receptacle area and the pressure tube. The valve assembly controls fluid flow to advance the cup assembly onto the heart, to maintain the cup assembly in an operable position, to operate the cup assembly, and to remove the cup assembly.

A system for improving cardiac performance includes a delivery tube and an expandable implant sized for delivery within the delivery tube. The expandable implant is adjustable between an expanded form and a compressed form. In the expanded form, the expandable implant is sized and shaped to extend beyond the delivery tube for compressing a portion of a heart. The expandable implant may take the form of a balloon and may be inflated and deflated during use. A sensor is preferably provided for measuring cardiac rhythm, wherein the expandable implant moves in synchronization with the measured cardiac rhythm. The sensor is preferably coupled to the expandable implant. The delivery tube may be sized for advancement through a thoracic cavity.

The invention relates to the technical field of medical instruments, and discloses a blood pumping device and a heart assisting device.A notch is formed in the inner wall of a machine shell, a lining is fixed to the inner wall of the machine shell, and an outer flow path groove is defined by the lining and the notch; the stator assembly is fixed to the inner wall of the lining, the rotor assembly comprises a rotating shaft and magnetic steel, and an inner flow path groove is formed in the interval between the stator assembly and the magnetic steel. The far-end bearing is fixedly arranged at the far end of the machine shell; the outer fixing piece is fixedly arranged at the near end of the machine shell, a communicating groove communicating with the outer flow path groove and a flow path hole penetrating through the communicating groove are formed in the outer fixing piece, and an outer side pipeline is fixed to the position of the flow path hole; an inner ring of the near-end bearing is fixedly connected with the near end of the rotating shaft, and an outer ring of the near-end bearing is fixedly connected with the outer fixing part; one end of the inner fixing piece is fixedly connected with the outer fixing piece, and the pipe wall directly faces the outer ring of the near-end bearing; and an inner side pipeline is fixed at the other end of the inner fixing piece. The outer side pipeline and the inner side pipeline are located on the same side of the device, perfusate flowing into the body of a patient can be reduced, and the safety and applicability of the device are improved.

The present invention relates to systems, methods and algorithms for determination of heart pump function and their use in livings subject are described.The invention further relates to complementary parts of such systems that work best in combination.Medical catheters, sheaths and shafts are disclosed that carry an arrangement of integrated digital sensor systems-on-chip (SoC) in the portion thereof residing inside the body. These devices combine at their portion that resides inside the body, the complete chain of signal transduction, signal analog-to-digital conversion and digital signal transmission, and allow to acquire single and multiple physical entities in a single setup. In specific instances the devices integrate wireless data transfer functionality, and in specific instances they integrate wireless energy harvesting for battery-free functionality.The present invention further describes complementary monitor systems that are suited for reception, processing and analysis of data acquired by such catheters / sheaths / shafts to yield a robust assessment of cardiac performance.Moreover, the present invention relates to innovations which render such systems applicable to patients with and without cardiac assist devices.

A cardiac assist system having a pumping device for moving blood, wherein a pumping capacity of the pumping device is adjustable using an adjustment signal based on laser doppler with an optical fiber. A measuring device measures a flow rate of the body fluid, the measuring device comprising at least one light source for outputting a light beam and at least one sensor element for detecting a reflected partial beam of the light beam. The measuring device is adapted to measure the body fluid using the reflected partial beam of the light beam. A determination device is adapted to determine the adjustment signal using the measurement signal. The device may include a bore opening to a blood flow channel, with an optical fiber extending through the bore.

The present invention relates to a brushless DC motor, in particular for an actuator unit of an implant, preferably for a heart assist system, comprising a stator and a rotor, the stator having a hollow cylindrical ironless winding, and a rotor rotatable relative to the stator, the rotor comprising a shaft with p permanent magnet pole pairs, the winding having n three-phase systems separated from one another. For a number of permanent magnet pole pairs p=1, the number of three-phase systems separated from one another is 2, and for a number of permanent magnet pole pairs p>1, the number of three-phase systems separated from one another corresponds to either an integer divisor of p (wherein the integer divisor is not equal to 1), or to the number p, or to twice the number p of permanent magnet pole pairs, wherein the n three-phase systems separated from one another in the hollow cylindrical ironless winding are arranged spatially offset from one another by an angle of 360° / n.

An external drive unit for an implantable heart assist pump is provided. The drive unit comprises a motor housing, a transcutaneous drive shaft and a motor for driving the heart assist pump. The motor is connectable to the heart assist pump via the drive shaft, and the motor is arranged inside the motor housing. The drive unit further comprises a catheter surrounding the drive shaft and a purge line for injecting a purge medium into a lumen of the catheter or into a space between the catheter and the drive shaft. The purge line is in thermal contact with an outer surface of the motor housing and / or with an outer surface of a proximal section of the catheter. Due to the thermal contact heat is transferred from the outer surface of the catheter in the proximal section and / or from the outer surface of the motor housing to the purge medium.

An access device for a heart chamber, a removable hemostatic valve unit, and a system including a cardiac assist unit are disclosed. In examples, the access device includes an apical base plate and a sealing unit configured to provide a separation of a wet zone from a heart chamber and a dry zone with a gaseous environment outside of said heart chamber inside a patient body at the same time.

The present invention provides a DCCD loading device comprising: a shaft that extends from a tip end to a handle; a wire frame in contact with the tip end, wherein the wire frame comprises a plethora of wire loops extending away from the tip; and a film in contact with the tip end and extending over at least a portion of the wire frame.

Used to control the rotational speed (n) of the non-pulsating ventricular assist device. VAD The control device (100) of the assisted heart (t) uses an event-based Bonnet control strategy, wherein the control device is configured to change the rotational speed (n) of the VAD (50) during the cardiac cycle of the assisted heart. VAD (t)) and by at least one trigger signal sequence (σ(t)) associated with at least one predetermined characteristic event in the cardiac cycle, the rotational speed (n) VAD The change in (t) is synchronized with the heartbeat. Furthermore, the VAD (50) for cardiac assistance includes a control device (100) for controlling the VAD, wherein the VAD is preferably, for example, a catheter-based, non-pulsating rotational blood pump.

Systems and methods assist with delivery of a medical device, such as a cardiac assistance device, within a patient. The system may include a sleeve or sheath for temporary covering of external ports into the cardiac assistance device during a procedure for the delivery. A pusher rod may also facilitate the procedure for the delivery. The cardiac assistance device may further contain grooves that may be engaged with a lasso for pulling the device through the vasculature system to position the device, to attach the device to an anchor, or to remove the device from the anchor.

The present invention relates to systems, methods and algorithms for determination of heart pump function and their use in livings subject are described.The invention further relates to complementary parts of such systems that work best in combination.Medical catheters, sheaths and shafts are disclosed that carry an arrangement of integrated digital sensor systems-on-chip (SoC) in the portion thereof residing inside the body. These devices combine at their portion that resides inside the body, the complete chain of signal transduction, signal analog-to-digital conversion and digital signal transmission, and allow to acquire single and multiple physical entities in a single setup. In specific instances the devices integrate wireless data transfer functionality, and in specific instances they integrate wireless energy harvesting for battery-free functionality.The present invention further describes complementary monitor systems that are suited for reception, processing and analysis of data acquired by such catheters / sheaths / shafts to yield a robust assessment of cardiac performance.Moreover, the present invention relates to innovations which render such systems applicable to patients with and without cardiac assist devices.

A control device (100), VAD (50) for controlling the rotational speed (nVAD (t)) of a non-pulsatile ventricular assist device, using an event-based Boron control strategy, wherein the control device is configured to change the rotational speed (nVAD (t)) of the VAD (50) within the cardiac cycle of the assisted heart and to synchronize the change of the rotational speed (nVAD (t)) with the heartbeat by means of at least one sequence of trigger signals ((t)) relating to at least one predetermined characteristic event in the cardiac cycle. Furthermore, a VAD (50) for heart assistance comprises a control device (100) for controlling the VAD, where the VAD is preferably a blood pump, for example based on non-pulsatile rotation of a catheter.

A cardiac assist device (1) has a cup-shaped element (2), an inner spherical element (5) and a tubular element (6). The cup-shaped element (2) has a cup wall (2a), one or more inflow openings (3), and an outflow element (4) with a small hole (4a). The inner spherical element (5) is positioned inside the cup element (2), not connected to the outflow element (4). The tubular element (6) is arranged to inflate and deflate the inner spherical element (5) during operation. During operation in the pumping mode of operation, the combination of the first material, the size of the cup wall (2a) and the size of the outflow element (4) provides a containment force of the cup element (2) to counteract the outward force of the inner spherical element (5).

A catheter blood pump includes a cannula with an expandable central portion having a proximal end, a distal end and a blood flow conduit therebetween. A flexible inlet portion at the distal end is provided with a plurality of spaced apart inlet struts configured to prevent an obstruction from entering, and a flexible outlet portion is provided with a plurality of spaced apart outlet struts operative to reduce a swirl velocity of blood, wherein the plurality of spaced apart inlet struts and the plurality of spaced apart outlet struts are fabricated from a collapsible shape memory material.

The application discloses a double-gas-path air source system, a double-gas-path heart auxiliary system and a use method. The double-gas-path heart auxiliary system comprises a pressure generating mechanism, a first auxiliary device, a second auxiliary device, a detection device and a control mechanism. The pressure generating mechanism alternately generates positive pressure and negative pressure during work. The first auxiliary device comprises a first driven device and a first pipe line, and a tube body at the farthest end of the first pipe line is provided with an inflow and an outflow. The first driven device is located in the tube body of the first pipe line and corresponds to the position of the outflow. The second auxiliary device comprises a second driven device and a second pipe line in communication with the second driven device. The pressure generating mechanism makes the second driven device repeatedly expand and contract through the second pipe line. The detection device is used for acquiring the intraventricular pressure and the intra-aortic pressure. The control mechanism controls the pressure generating mechanism to drive the first driven device and the second driven device according to the corresponding time sequence in a cycle control period according to the pressure signal sent by the detection device.

The present disclosure relates to an implantable device for improving the pump function of the heart of a human patient by applying an external force on the heart muscle. The device is provided with a first part having a first surface comprising a ceramic material, and a second part having a second surface comprising a ceramic material.

A cardiac assist device (10) for acting on a heart (11) having an actual end-diastolic conformation in vivo and an ideal end-diastolic conformation that would cause the heart (11) to pump more efficiently. The cardiac assist device (10) has a shell configuration (13) with a top opening (24), a base (21), and a maximum interior diameter (MD) between the top opening (24) and the base (21). The shell configuration (13) has a total long axis length (TL). The shell configuration (13) has a major axis that follows a curvature rotated about a major axis. At last one inflatable membrane (26) extends from said shell configuration (13), wherein said shell configuration (13) and said at least one inflatable membrane (26) act upon said heart (11) to alter said actual end-diastolic conformation toward said ideal end-diastolic conformation.

A bidirectional intravascular blood pump system is disclosed for deployment in the descending aorta to improve perfusion in both upper and lower extremities. In some embodiments, the system includes a flexible stent housing containing an inflatable pump chamber and selectively inflatable proximal and distal check valves. In some embodiments, a controller sequences inflation and deflation of the pump components in coordination with the cardiac cycle. In some embodiments, the system capable of dynamically providing flow in opposite directions within the descending aorta to optimize systemic and cerebral perfusion. In some embodiments, the system can direct blood flow in either direction through the aorta by an inflation sequence of the check valves and pump chamber. In some embodiments, one or more bypasses in a check element, stent, and / or formed from selective inflation, enable pressurization of the aortic arch when timed with the closing of the aortic valve.

Described herein are pumps that linearly reciprocate to assist with circulating blood within the body of a patient. Red blood cell damage may be avoided or minimized by such linear pump movement. The linearly reciprocating movement may also generate a pulsatile pumping cycle that mimics the natural pumping cycle of the heart. The pumps may be configured to reside at various body locations. For example, the pumps may be situated within the right ventricle, the left ventricle, the ascending aorta, the descending aorta, the thoracic aorta, or the abdominal aorta. In some instances, the pump may be deployed within the venous circulation. In other instances, the pump may reside outside the patient.

The present invention relates to a heart pump apparatus comprising a turbine pump for assisting the heart of a human patient. The invention is based on the realization that a turbine without a centre axis would improve the capacity of the heart help pump apparatus. The present invention also relates to a turbine pump system for assisting the heart of a human patient. The present invention also relates to operation methods and methods for surgically placing a rotating body of a turbine pump and a stator of a turbine pump in a patient.

Systems and methods assist with deliver}' of a medical device, such as a cardiac assistance device, within a patent. The system may include a sleeve or sheath for temporary' covering of external ports into the cardiac assistance device during a procedure for the delivery. A pusher rod may also facilitate the procedure for the delivery. The cardiac assistance device may further contain grooves that may be engaged with a lasso for pulling the device through the vasculature system to position the device, to attach the device to an anchor, or to remove the device from the anchor.