MODULAR MEDICAL PUMP ASSEMBLY

• US 20100280501A1
• Filed: 04/07/2010
• Published: 11/04/2010
• Est. Priority Date: 04/30/2009
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Haase, James M., Elmouelhi, Ahmed, Nelson Konen, Cynthia R., Pattock, Brian M., Whitehead, Nicholas R., Hovind, Thomas W., Young, Dale A., Gray, John Michael
• Granted Patent: US 8,632,496 B2
• Time in Patent Office: Days
• US Class Current: 604/891.1
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: Y10T 29/49002 Electrical device making
• CPC Class Codes: Y10T 29/49764 with testing or indicating

Abstract

A medical pump subassembly comprises a magnetic cup forming a recess. The magnetic cup includes a protrusion within the recess. The cup forms a central aperture through the protrusion. The medical pump subassembly further comprises an electromagnetic coil within the recess and circumscribing the protrusion, a weld ring surrounding the recess, a barrier plate covering the recess, and a seal between the weld ring and the barrier plate to fluidically separate an interior of the cup from an external surface of the barrier plate.

Claims

1. A medical pump subassembly comprising:

a magnetic cup forming a recess, wherein the magnetic cup includes a protrusion within the recess, wherein the cup forms a central aperture through the protrusion;

an electromagnetic coil within the recess and circumscribing the protrusion;

a weld ring surrounding the recess;

a barrier plate covering the recess; and

a seal between the weld ring and the barrier plate to fluidically separate an interior of the cup from an external surface of the barrier plate.

2. The medical pump subassembly of claim 1, further comprising a potting material encasing the electromagnetic coil within the recess.

3. The medical pump subassembly of claim 1, wherein the seal is a first weld joint, the subassembly further comprising:

a sleeve within the central aperture, wherein the barrier plate forms a mating aperture that coincides with the central aperture of the cup; and

a second weld joint between the sleeve and the barrier plate to fluidically separate the interior of the cup from the external surface of the barrier plate.

4. The medical pump subassembly of claim 3, wherein the sleeve is interference fit in the central aperture of the cup.

5. The medical pump subassembly of claim 3, further comprising a one-way valve in the sleeve opposite to the barrier plate.

6. The medical pump subassembly of claim 1, wherein the cup forms a groove surrounding the recess, and wherein the weld ring is interference fit in the groove.

7. The medical pump subassembly of claim 1, further comprising a one-way valve in the central aperture opposite to the barrier plate.

8. The medical pump subassembly of claim 1, wherein the weld ring includes a notch adjacent to an outer perimeter of the barrier plate, wherein the seal is a weld joint between the barrier plate and the weld ring, and wherein the weld joint is at least partially located within the notch.

9. The medical pump subassembly of claim 1, wherein the weld ring comprises titanium.

10. A medical pump assembly comprising:

a magnetic cup forming a recess, wherein the magnetic cup includes a protrusion within the recess, wherein the cup forms a central aperture through the protrusion;

a one-way valve that controls fluid flow within the central aperture;

an electromagnetic coil within the recess and circumscribing the protrusion;

a barrier plate covering the recess;

a piston within the central aperture;

a magnetic pole attached to the piston, wherein the magnetic pole is adjacent to an external surface of the barrier plate;

a cover enclosing the magnetic pole between an interior surface of the cover and an external surface of the barrier plate, wherein the cover constrains the motion of the piston within the central aperture; and

a seal between the cup and the barrier plate and the cover to fluidically separate an interior of the cup from the external surface of the barrier plate.

11. The medical pump assembly of claim 10, wherein the seal includes a weld joint between the cup, the barrier plate and the cover.

12. The medical pump assembly of claim 11, wherein the seal is a first seal, the assembly further comprising:

a sleeve within the central aperture, wherein the barrier plate forms a mating aperture that coincides with the central aperture of the cup; and

a second seal between the sleeve and the barrier plate to fluidically separate the interior of the cup from the external surface of the barrier plate.

13. The medical pump assembly of claim 10, wherein the cup comprises a weld ring surrounding the recess, wherein the seal is between the weld ring and the barrier plate.

14. The medical pump assembly of claim 13, wherein the weld ring includes a first notch adjacent to an outer perimeter of the barrier plate, wherein the cover includes a second notch adjacent to the first notch, wherein the seal is a weld joint between the cup, the barrier plate and the cover, and wherein the weld joint is at least partially located within both the first notch and the second notch.

15. The medical pump assembly of claim 10, further comprising:

a bulkhead including a cup-mounting bay, wherein the cup is mounted within the bay; and

a second seal between the cup and the bulkhead to fluidically separate an exterior of the cup from an external surface of the barrier plate.

16. The medical pump assembly of claim 10, wherein the cover includes a filter within an inlet flow path of the medical pump assembly.

17. The medical pump assembly of claim 10, wherein the cover includes one or more protrusions on the interior surface of the cover, wherein the protrusions define a stroke length of the piston.

18. A method of manufacturing a medical pump comprising:

placing an electromagnetic coil within a recess of a magnetic cup and circumscribing a protrusion in the magnetic cup, wherein the a protrusion is within the recess, wherein the magnetic cup forms a central aperture through the protrusion, and wherein the magnetic cup is included in a magnetic cup/weld ring assembly also including a weld ring surrounding the recess;

sealing a barrier plate to the weld ring to enclose the electromagnetic coil within the recess to fluidically separate an interior of the cup from an external surface of the barrier plate; and

potting the electromagnetic coil within the recess after sealing the barrier plate to the weld ring to create a potted magnetic cup/electromagnetic coil assembly.

19. The method of claim 18, further comprising:

placing the potted magnetic cup/electromagnetic coil assembly within a cup-mounting bay of a bulkhead; and

sealing the weld ring to the bulkhead to fluidically separate an exterior of the cup from an external surface of the barrier plate.

20. The method of claim 18, further comprising:

positioning a piston of a piston/pole subassembly within the central aperture;

positioning a cover configured to mate with the weld ring to enclose the magnetic pole between an interior surface of the cover and an external surface of the barrier plate; and

sealing the cover to the weld ring.