| 摘要 |
A pump for medical implantation is disclosed which comprises a housing forming a cylindrical cavity, a cylindrical piston movable in the cavity for providing fluid communication between the cavity and channels opening to the cavity, and a motion device for magnetically rotating the piston and moving it back and forth to provide fluid flow between the cavity and the channels. Advantageously, the cylindrical piston is movable as a loose body in the cavity, and thus, functions as a valve. As a result, the pump of the invention is simple and very reliable, since it is devoid of traditional valves. When implanted in a patient, the pump can be used to pump hydraulic fluid between a reservoir and a hydraulic constriction device also implanted in a patient to thereby operate the device and form a the constriction of a passage of the patient's organ. Also disclosed is a method for laparascopically implanting the hydraulically operable implant together with the pump in a patient's abdomen.
|
