초록 ▼

A cannula pump is provided which incorporates a miniature rotary pump into a cardiac cannula of essentially the same size as currently utilized with routine cardiopulmonary bypass. The pump may be inserted via a single small incision in the heart to obtain both inflow and outflow cannulation simulta

A cannula pump is provided which incorporates a miniature rotary pump into a cardiac cannula of essentially the same size as currently utilized with routine cardiopulmonary bypass. The pump may be inserted via a single small incision in the heart to obtain both inflow and outflow cannulation simultaneously, and provide sufficient flow to completely unload the ventricle during its use. Because application of the device is extraordinarily simplified, it is suitable for rapid emergency insertion in any setting where the chest can be safely opened, including emergency room and battlefield applications. A small electric motor, implanted within the heart, provides power to the impeller via a small shaft supported on blood immersed bearings. A disposable cannula pump utilized with a reusable motor provides an inexpensive device for routine surgical use.

대표청구항 ▼

[ I claim:] [1.] A method for supporting all or part of the pumping function of a heart, comprising the steps of:a) providing a cannula pump including a cannula housing having a pump section and a motor section, the pump section having a pumping mechanism, the motor section having an electric motor

[ I claim:] [1.] A method for supporting all or part of the pumping function of a heart, comprising the steps of:a) providing a cannula pump including a cannula housing having a pump section and a motor section, the pump section having a pumping mechanism, the motor section having an electric motor mounted therein for imparting movement to the pumping mechanism, the pump section and motor section having substantially equal outer diameters, the cannula housing further including at least one blood inflow opening disposed in the pump section to permit blood to enter the pump section and at least one blood outflow opening to permit blood to exit the cannula housing;b) positioning the cannula pump within one of the left and right ventricles of a patient's heart such that at least the electric motor is contained within the one ventricle and the outflow opening of the cannula housing is disposed within a respective artery associated with the one ventricle; andc) activating the electric motor such that the pumping mechanism directs blood entering through the inflow opening of the cannula housing through the outflow opening of the cannula housing.