Magnetic occluding device

• US 4,994,019 A
• Filed: 02/06/1990
• Issued: 02/19/1991
• Est. Priority Date: 07/28/1989
• Status: Expired due to Fees

• Current Assignee: Micro Magnetics, Inc.
• Original Assignee: Micro Magnetics, Inc.
• Inventors: Lindquist, Dale C., Keldahl, Loren R., Fernandez, Mario F., Miller, Paul L.
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): Cermak, Adam J.
• Application Number:
  US07/474,680
• Time in Patent Office: 378 Days
• Field of Search: 128/325-327, 128/346, 128/885, 128/DIG. 25, 251/4, 251/5, 251/7, 251/9, 251/10, 251/65, 600/12, 600/29-32, 604/250
• US Class Current: 600/30
• CPC Class Codes: A61F 2/0036 implantable A61F2/0018 takes precedence
• CPC Class Codes: A61F 2210/009 magnetic
• CPC Class Codes: A61N 2/06 using magnetic fields produced by permanent magnets A61N2/12 takes precedence
• CPC Class Codes: Y10S 128/25 Artificial sphincters and devices for controlling urinary incontinence

Abstract

A self-contained, implantable device for controlling passage of material through internal body conduits, and in particular to control the material passage through a closure point commonly referred to as a sphincter, such as flow through the urethra from the bladder, movement through the bowel, or flow of medications from an artificial conduit that is implanted. The magnetic occluding device comprises a fixed magnetic pressure plate assembly, positioned on one side of a conduit, and a permanent magnet on an opposite side of the conduit. The permanent magnet can be moved so that the magnetic force between the pressure plate and the magnet can be altered from a position wherein the attraction between the movable magnet and the pressure plate carries the conduit between the magnet and the pressure plate to collapse to close off flow through the conduit, to a position wherein the conduit can open. The position of the magnetic poles of the movable magnet is changed either by being rotated or displacing it laterally with the pressure plate so the magnets tend to at least slightly repel each other when the conduit is to be opened. Control of the magnetic force is achieved to insure that the flow of blood in the conduit is not cut off.

Claims

1. A magnetic occluding device for a conduit in a body comprising:

first and second assembles, said assemblies including means for mounting the assemblies on opposite sides of a bodily conduit;

at least a first of said assemblies including magnet means having a pair of poles that are spaced apart in a reference direction passing through the poles, said magnet means being movably mounted on the first assembly for movement between first and second positions, the reference direction of the poles being substantially transverse to the conduit in one of said positions;

a second of said assemblies including means that are magnetically attracted to the poles of the magnet means in a first position of the magnet means the magnet attraction between the two assemblies is substantially reduced to permit a bodily conduit placed between the assemblies to expand, the magnet means being movable between the first and second positions in a direction parallel to a plane defined by the second assembly; and

means for actuating the magnet means between the first and second positions.

2. The apparatus as specified in claim 1 wherein the means for actuating comprises a fluid pressure actuator coupled to the magnet means, and a reservoir for containing fluid fluidly connected to the actuator and which can be subjected to pressure to move the actuator, whereby upon pressure being applied to said reservoir, the magnet means is moved to its second position.

3. The apparatus as specified in claim 2 wherein both of said assemblies include permanent magnet means, and at least one of said magnet means being movable.

4. A magnetic occluding device according to claim 1 wherein said magnet means is rotatably mounted on one of the first and second assemblies for actuation about a rotational axis, the magnetic poles being movable substantially 90°

about the rotational axis of the magnet means to vary the magnetic attraction between the two assemblies.

5. A magnetic occluding device for a bodily conduit comprising a totally implantable member having first and second housings;

means for supporting said first and second housings on opposite sides of a bodily conduit, said first housing having first magnet means therein;

means forming a part of the second housing to provide for attraction of the first magnet means toward the second housing, said means to provide attraction having regions of greater and less magnetically attractive capabilities for the first magnet means, whereby in the first position of the first magnet means the conduit between the assemblies is collapsed to be closed, and in the second position of said first magnet means, the magnetic force reduces sufficiently to permit the conduit to open; and

means for moving the first magnet means between its first and second postions.

6. The apparatus as specified in claim 5 wherein said first magnet means is rotatably mounted with respect to the second housing to shift the position of the magnetic poles thereon to control the magnetic force with respect to the second housing.

7. The apparatus as specified in claim 5 wherein said first magnet means is movable laterally with respect to a longitudinal axis of the conduit with which the housings are associated, wherein the magnetic poles of the first magnet means are changed in position upon laterally linear sliding movement.

8. The apparatus as specified in claim 5 wherein the second of the housings includes a second magnet means, the second magnet comprising the means for providing attraction for the first magnet, the first and second magnet means having poles that are generally aligned across the conduit in a first position of the first magnet means, and wherein the magnetic poles of the first and second magnets are offset sufficiently to reduce the magnetic force with the first magnet means in its second position.

9. The apparatus of claim 8 wherein the housings are implantable in the body, and actuator means for moving the first magnet means between its respective positions, said actuator means being totally implantable in a body and having means manually operable from the exterior of the body for moving the first magnet means to its second position.

10. The apparatus of claim 9 wherein the first magnet means is rotatably mounted with respect to the second housing.

11. A magnetic occluding device for a bodily conduit comprising a totally implantable member having first and second housings;

means for supporting said first and second housings on opposite sides of a bodily conduit, the first housing having first magnet means therein;

means forming a part of the second housing to provide for attraction of the first magnet means toward the second housing, said means to provide attraction having regions of greater and less magnetically attractive capabilities for the first magnet means, whereby in a first position of the first magnet means the conduit between the assemblies is collapsed to be closed, and in a second position of said first magnet means, the magnetic force reduces sufficiently to permit the conduit to open;

said housings comprising interchangeable substantially identical housing members that are reversed and inverted when placed on opposite sides of the conduit, each of said housing members each having a central pad and a pair of spaced apart legs on one end of the pad, and a single leg on an opposite side of the pad, the single leg of each housing member interfitting between the pair of legs from the other housing member, the interfitting legs being oriented on each of opposite lateral sides of the conduit when placed on a conduit; and

pin means for holding the respective interfitting single legs and the associated pair of legs together whereby the legs can permit the housing members to span the conduit on which they are placed and to be able to move apart, the first magnet means and the means for providing attraction being mounted on the pads of the respective first and second housing members and being aligned with the conduit on opposite sides thereof when the housing members are placed on a conduit.

12. The apparatus as specified in claim 11 and means for spacing the magnet means of the housing members a different distance apart when the conduit is collapsed, comprising removable spacer means for positioning between the housing pads and the conduit to vary the spacings of the magnet means.