Micro piston pump

Patent metadata

Field	Value
Publication number	US-11280327-B2
Application number	US-201816054323-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Aug 3, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A low-force, non-displacement, micro/miniature valve and/or pump assembly is provided. A tube component having a first side port coupled to an inlet portion and a second side port coupled to an outlet portion can be selectively moved to alternatively couple the side ports to a first or second piston pump chamber. First and second pistons can be actuated after positioning the tube component to either draw in fluid or push out fluid from either the first or second piston pump chambers during each actuation of the pistons. The fluid can be drawn in from a reservoir and can be expelled to a patient for providing a dose of the fluid to the patient.

First claim

The invention claimed is:

1. A drug delivery device, comprising:
a reservoir configured to store a liquid drug;
a fluid path component configured to be coupled to a patient; and
a pump system coupled to the reservoir and to the fluid path component, the pump system including:
a piston pump block;
a first septum positioned within the piston pump block;
a second septum positioned within the piston pump block, wherein the first septum and the second septum are fitted into open areas of the piston pump block;
a first piston configured to move within a first piston pump chamber, the first piston and the first piston pump chamber positioned on a first side of the first and second septa;
a second piston configured to move within a second piston pump chamber, the second piston and the second piston pump chamber positioned on a second, opposite side of the first and second septa; and
a tube component extending through the piston pump block, the first septum, and the second septum and positioned between the first and second pistons and the first and second piston pump chambers, wherein the tube component comprises a first side port, a second side port, and a center plug positioned between the first and second side ports, the first side port coupled to an inlet component portion of the tube component and the second side port coupled to an outlet component portion of the tube component,
wherein the tube component is selectively moved to couple the first side port to the first piston pump chamber and the second side port to the second piston pump chamber or to couple the first side port to the second piston pump chamber and the second side port to the first piston pump chamber, and
wherein the first and second pistons are selectively moved to draw in the liquid drug from the reservoir to the first piston pump chamber from the inlet component portion and to expel the liquid drug from the second piston pump chamber through the outlet component portion to the fluid path component when the first side port is coupled to the first piston pump chamber and the second side port is coupled to the second piston pump chamber or to draw in the liquid drug from the reservoir to the second piston pump chamber and to expel the liquid drug from the first piston pump chamber to the fluid path component when the first side port is coupled to the second piston pump chamber and the second side port is coupled to the first piston pump chamber.

2. The drug delivery device of claim 1 , further comprising a first channel positioned between the first septum and the second septum and coupled to the first piston pump chamber.

3. The drug delivery device of claim 2 , further comprising a second channel positioned between central portions of the first septum and the second septum and coupled to the second piston pump chamber.

4. The drug delivery device of claim 1 , wherein the inlet component portion is coupled to the reservoir storing the liquid drug.

5. The drug delivery device of claim 4 , wherein the outlet component portion is coupled to a cannula.

6. The drug delivery device of claim 1 , further comprising a first piston plate coupled to the first piston and a second piston plate coupled to the second piston.

7. The drug delivery device of claim 6 , further comprising a linkage actuator component coupled to the first piston plate and the second piston plate.

8. The drug delivery device of claim 7 , wherein the first piston plate comprises a first bi-stable spring coupled to a first extension component of a pump base and the second piston plate comprises a second bi-stable spring coupled to a second extension component of the pump base.

9. The drug delivery device of claim 8 , wherein the first and second bi-stable springs switch from a first stable state to a second state when the first and second pistons are moved in a first direction along a first central axis of the pump system and switch from the second stable state to the first stable state when the first and second pistons are moved in a second, opposite direction.

10. The drug delivery device of claim 1 , further comprising a pump base, and the piston pump block positioned on the pump base.

11. The drug delivery device of claim 10 , wherein the pump base further comprises a first travel stop and a second travel stop, the first travel stop configured to block further movement of the first piston in a first direction along a first central axis of the pump system after the first and second pistons are moved by a full stroke in the first direction, the second travel stop configured to block further movement of the second piston in a second, opposite direction from the first direction after the first and second pistons are moved by the full stroke in the second, opposite direction.

12. The drug delivery device of claim 11 , wherein the first and second travel stops are conductive.

13. The drug delivery device of claim 12 , wherein a position of the first and second pistons is provided based on the first piston contacting the first travel stop or the second piston contacting the second travel stop.

14. The drug delivery device of claim 1 , further comprising: a first central axis of the pump system, wherein the first septum and the second septum are aligned along a second central axis of the pump system and the second central axis of the pump system is perpendicular to the first central axis of the pump system.

15. The drug delivery device of claim 14 , wherein the first and second pistons and the first and second piston pump chambers are aligned along the first central axis of the pump system.

16. The drug delivery device of claim 15 , wherein during a first stage of operation, the tube component is moved to couple the first side port to the first piston pump chamber and to couple the second side port to the second piston pump chamber.

17. The drug delivery device of claim 16 , wherein during a second stage of operation, the first and second pistons are moved in a first direction along the first central axis of the pump system to draw the liquid drug into the first piston pump chamber from the first side port and the inlet component portion and to expel the liquid drug from the second piston pump chamber through the second side port and the outlet component portion.

18. The drug delivery device of claim 17 , wherein during a third stage of operation, the tube component is moved in a first direction parallel to the second central axis of the pump system to couple the first side port to the second piston pump chamber and to couple the second side port to the first piston pump chamber.

19. The drug delivery device of claim 18 , wherein during a fourth stage of operation, the first and second pistons are moved in a second, opposite direction along the first central axis of the pump system to draw the liquid drug into the second piston pump chamber from the first side port and the inlet component portion and to expel the liquid drug from the first piston pump chamber through the second side port and the outlet component portion.

20. The drug delivery device of claim 19 , wherein the tube component is moved along a second direction parallel to the second central axis of the pump system, wherein the second direction of the tube component is opposite to the first direction of the tube component.

Assignees

• Insulet Corp

Inventors

• Allis Daniel
• Mclaughlin Ian
• Phillips Kenneth

Classifications

• F04B19/006 Primary

  Micropumps (F04B43/043 and F04B43/095 take precedence) · CPC title

• F04B1/02 Primary

  having two cylinders (in V-arrangement F04B1/04) · CPC title

• F04B7/0053

  for reciprocating distribution members · CPC title

• F04B7/0049

  for oscillating distribution members · CPC title

• F04B7/0026

  and having an oscillating movement · CPC title