MULTI-MATERIAL SINGLE-PIECE ACTUATOR MEMBER FOR MINIATURE RECIPROCATING PISTON PUMP IN MEDICAL APPLICATIONS

• US 20110172646A1
• Filed: 01/08/2010
• Published: 07/14/2011
• Est. Priority Date: 01/08/2010
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Elmouelhi, Ahmed, Li, Bernard Q., Haase, James M.
• Granted Patent: US 8,430,651 B2
• Time in Patent Office: Days
• US Class Current: 604/891.1
• CPC Class Codes: A61M 5/14212 Pumping with an aspiration and an expulsion action
• CPC Class Codes: A61M 5/14276 specially adapted for implantation

Abstract

An implantable medical device including a two piece actuator member which comprises a monocrystaline piston and a magnetizable pole. The monocrystalline piston is positioned within a piston channel having a surface having a titanium-oxide layer. The monocrystalline piston is selectively movable within the piston bore to permit intake and output of fluids.

Claims

1. An implantable medical device, comprising:

a housing;

a reservoir disposed within the housing;

a drive mechanism assembly coupled to the housing, comprising;

a sleeve having a hollow piston channel, the surface of the channel including an oxidized layer;

a two piece actuator member, the actuator member comprising;

a bio-compatible monocrystalline piston axially disposed within the piston channel bore; and

a magnetizable pole coupled to an end of the piston.

2. The device of claim 1, wherein the bio-compatible monocrystalline is sapphire.

3. The device of claim 1, wherein the bio-compatible monocrystalline is ruby.

4. The device of claim 1, further comprising a lubricious layer disposed over the oxidized layer.

5. The device of claim 1, wherein the piston is coupled to the pole through press fit coupling.

6. The device of claim 1, wherein the piston is moveable within the piston channel upon magnetic attraction of the pole.

7. A pump assembly for delivery of an infusion medium, comprising:

a pump housing open on one side to a hollow interior section;

an actuator member sleeve disposed within the housing having a piston-receiving channel, wherein a surface of the channel comprises an oxidized layer;

an two piece actuator member assembly including;

a bio-compatible monocrystalline piston axially disposed to reciprocate within the piston-receiving channel; and

a magnetizable pole coupled to the piston.

8. The pump assembly of claim 7, wherein the pole is secured to the piston through press fit coupling in a perpendicular orientation.

9. The pump assembly of claim 7, wherein the bio-compatible monocrystalline is sapphire.

10. The pump assembly of claim 7, wherein the bio-compatible monocrystalline is ruby.

11. The pump assembly of claim 7, wherein the bio-compatible monocrystalline piston is moveable within the piston-receiving channel upon magnetic attraction of the magnetizable pole to the sleeve.

12. The pump assembly of claim 7, further comprising a cover coupled to the housing substantially adjacent the open side of the housing.