초록 ▼

Highly miniaturized electro-mechanical medical implants for certain applications cannot be fit into the available anatomic space unless their diameter can be made small enough. With devices such as rotary blood pumps or linear actuators, using rotary or linear electric motors, a thin motor stator th

Highly miniaturized electro-mechanical medical implants for certain applications cannot be fit into the available anatomic space unless their diameter can be made small enough. With devices such as rotary blood pumps or linear actuators, using rotary or linear electric motors, a thin motor stator that provides sufficient power must be encased in a corrosion resistant hermetically sealed enclosure into which electric wires must pass. Hermetic feedthroughs of the prior art are not structurally suited to maximal miniaturization with optimal electrical properties because of the need for welding of ferrules or other support components. The sub-miniature medical implants having the robust feedthrough of the present invention integrate the feedthrough wires, insulators, and sealing within a radially extending flange that is part of the end wall of the motor enclosure. This permits the largest feedthrough wire and thickest insulator to be built into the limited available space.

대표청구항 ▼

1. An implantable blood pump comprising; a. A slot-less brushless DC motor having a motor stator enclosed in a welded hermetically sealed housing,b. A cylindrical bore through said housing within which a hydrodynamic pump rotor and impeller rotate on bearings,c. Three electric feedthroughs adapted t

1. An implantable blood pump comprising; a. A slot-less brushless DC motor having a motor stator enclosed in a welded hermetically sealed housing,b. A cylindrical bore through said housing within which a hydrodynamic pump rotor and impeller rotate on bearings,c. Three electric feedthroughs adapted to conduct electric power to terminations of said motor stator, circumferentially spaced apart from one another at locations on one end of said housing, individually hermetically sealed, insulated, and formed integral with one end wall of said housing, andd. the three hermetically sealed feedthroughs are enclosed within the housing. 2. The blood pump of claim 1 having a circumferential groove outside and adjacent to one end of the hermetically sealed housing within which groove connections of motor power leads to the electric feedthroughs may be made and encapsulated in an insulating material such as epoxy. 3. A miniaturized implantable medical device having a hermetically sealed corrosion resistant enclosure to contain the stator of an electro-magnetic actuator, comprising: a. a first generally cylindrical housing member having an outer generally tubular wall adapted to receive said motor stator within said tubular wall, and a washer shaped end wall confining the motor stator on one end,b. A second generally cylindrical housing member having a thin-walled sleeve adapted to fit through a bore of said motor stator and contact the hole within the washer shaped end wall of said first housing member around its entire circumference,c. Said second housing member including a flange extending outwardly from said sleeve to enclose said motor stator and make circumferential contact with said housing, said flange having two or more hermetic feedthroughs, comprised of wires passing through the flange, insulated by suitable material hermetically bonded to the inside of holes passing through the flange and also hermetically bonded to wires passing through holes in the insulating material,d. Said first and second housing members welded circumferentially at each end to hermetically seal the motor stator therewithin, ande. Said two or more hermetic feedthroughs and said wires passing through the flange are enclosed within the outer tubular wall. 4. The feedthrough of claim 3 in which the medical device is an implantable rotary blood pump. 5. The feedthrough of claim 3 in which each electric wire passes through a separate hole in said end wall within which it is sealed and insulated by a surrounding glass or ceramic ring, and the diameter of said hole in the flange is greater than one half of the radial dimension of the motor stator contained within said enclosure. 6. The feedthrough of claim 3 in which said hermetically sealed enclosure contains a slot-less brushless DC motor stator. 7. The feedthrough of claim 3 in which three electrical wires are located around the circumference of the end wall at approximately 90-180 degrees of separation, and the motor stator of the electro-magnetic actuator includes three phase brushless DC motor winding with terminations spaced circumferentially at positions aligned with the wires. 8. A hermetically sealed corrosion resistant enclosure to contain the stator of a miniaturized implantable medical device comprising: a. a first generally cylindrical housing member having an outer generally tubular wall adapted to receive said motor stator within said tubular wall, and a washer shaped end wall confining the motor stator on one end,b. A second generally cylindrical housing member having a thin-walled sleeve adapted to fit through a bore of said motor stator and contact the hole within the washer shaped end wall of said first housing member around its entire circumference,c. Said second housing member including a flange extending outwardly from said sleeve to enclose said motor stator and make circumferential contact with said housing,d. said washer shaped end wall of said first housing member having two or more hermetic feedthroughs, comprised of wires passing through the end wall, insulated by suitable material hermetically bonded to the inside of holes passing through the end wall and also hermetically bonded to wires passing through holes in the insulating material,e. Said first and second housing members welded circumferentially at each end to hermetically seal the motor stator therewithin, ande. Said two or more hermetic feedthroughs and said wires passing through the end wall are enclosed within the outer tubular wall. 9. The feedthrough of claim 8 in which the medical device is an implantable rotary blood pump. 10. The feedthrough of claim 8 in which each electric wire passes through a separate hole in said end wall within which it is sealed and insulated by a surrounding glass or ceramic ring, and the diameter of said hole in the flange is greater than one half of the radial dimension of the motor stator contained within said enclosure. 11. The feedthrough of claim 8 in which said hermetically sealed enclosure contains a slot less brushless DC motor stator. 12. The feedthrough of claim 8 in which three electrical wires are located around the circumference of the end wall at approximately 90-180 degrees of separation, and the motor stator of the electro-magnetic actuator includes three phase brushless DC motor winding with terminations spaced circumferentially at positions aligned with the feedthrough wires.