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.

The devices and methods described herein are for use with conventional catheters and guidewires. Access can be maintained with the catheter and/or guidewire and the device can be backloaded onto the guidewire and into the catheter to be advanced to a target. The devices can include a tubular shaft having a lumen for receiving a guidewire; at least one aperture for receiving a feature of an implant positioned on the tubular shaft; and a plurality of relief cuts. The outer diameter of the tubular shaft is sized relative to an inner diameter of a catheter for receiving the tubular shaft, such that a sheath is not positionable in a lumen of the catheter when the tubular shaft is in the lumen of the catheter. The tubular shaft can be axially displaced in the lumen of the catheter to advance or retract the implant positioned on the tubular shaft.

The present invention provides a preparation method of a material for a puncture-resistant artificial blood vessel. The artificial blood vessel prepared by the method comprises two layers: the dense outer layer and the electrospun inner layer, the structures of these two layers are combined tightly and are inseparable, so that the properties of blood oozing resistance and repeated puncture resistance required by the artificial blood vessel can be provided. The puncture-resistant artificial blood vessel provided by the present invention has excellent biocompatibility, blood compatibility and flexibility and has the functions of blood oozing resistance and repeated puncture resistance. The method provided by the present invention has the characteristics such as convenience in operation, simplicity in production process and liability to the realization of large scale.

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.