Fluid transfer devices with resilient valve structures and ambulatory infusion devices including same
View Patent ↗Fluid transfer devices for use in, for example, ambulatory infusion devices and infusions devices including fluid transfer devices.
1. An infusion device, comprising:
a fluid transfer device including
a pump, and
a valve, associated with the pump, having a valve base defining a lumen having an outlet and a seal surface that extends around the lumen outlet, and a resilient structure stretched over the valve base seal surface and the lumen outlet and including a valve member movable between a closed state where the valve member engages the seal surface and an open state where at least a portion of the valve member is spaced apart from the seal surface;
an infusion device outlet operably connected to the fluid transfer device; and
a reservoir operably connected to the fluid transfer device.
2. An infusion device as claimed in claim 1 , further comprising:
a housing; and
wherein the fluid transfer device and the reservoir are located within the housing.
3. An infusion device as claimed in claim 1 , wherein the reservoir comprises a negative pressure reservoir.
4. An infusion device as claimed in claim 1 , wherein the seal surface or the valve member includes a protrusion that extends around the lumen outlet.
5. An infusion device as claimed in claim 1 , wherein the resilient structure includes a plurality of slots that define the movable valve member.
6. An infusion device as claimed in claim 1 , wherein the resilient structure includes a wall and the movable valve member is connected to the wall by a plurality of supports.
7. An infusion device as claimed in claim 1 , wherein
the pump includes a piston; and
the piston is biased to a position in contact with the resilient structure and is movable to a pull-back position in spaced relation to the resilient structure.
8. An infusion device as claimed in claim 1 , wherein the pump includes an electromagnet.
9. An infusion device as claimed in claim 1 , wherein the resilient structure is stretched in a direction that is substantially parallel to the valve member seal surface.
10. An infusion device as claimed in claim 1 , wherein the valve member comprises a resilient valve member.
11. An infusion device, comprising:
a fluid transfer device including
a pump, and
a valve, associated with the pump, having a valve base defining a lumen having an outlet, a seal surface that extends around the lumen outlet and an outer diameter, and a cup-shaped resilient structure defining a relaxed inner diameter that is substantially less than the outer diameter of the valve base, mounted in tension on the valve base, including a valve member movable between a closed state where the valve member engages the seal surface and an open state where at least a portion of the valve member is spaced apart from the seal surface;
an infusion device outlet operably connected to the fluid transfer device; and
a reservoir operably connected to the fluid transfer device.
12. An infusion device as claimed in claim 11 , wherein
the pump includes an outer pump tube; and
a portion of the cup-shaped resilient structure is located between the valve base and the outer pump tube.
13. An infusion device as claimed in claim 12 , wherein
the pump includes an inlet chamber and an inlet tube, with a main portion and the valve base, adjacent to the inlet chamber; and
the main portion defines an outer surface, the outer pump tube defines an inner surface, and the outer surface of the inlet tube main portion abuts the inner surface of the outer pump tube.
14. An infusion device as claimed in claim 12 , wherein
the pump includes an electromagnet having a core with a main portion and the valve base; and
the main portion defines an outer surface, the outer pump tube defines an inner surface, and the outer surface of the main portion abuts the inner surface of the outer pump tube.
15. An infusion device as claimed in claim 11 , wherein the relaxed inner diameter of the cup-shaped resilient structure is about 50% to 95% of the outer diameter of the valve base.
16. An infusion device, comprising:
a fluid transfer device having
an inlet valve including a valve base defining a lumen having an outlet and a seal surface that extends around the lumen outlet, and a resilient membrane including at least one narrow opening, mounted on the valve base, and a valve member associated with the narrow opening and movable between a closed state where the valve member engages the seal surface and an open state where at least a portion of the valve member is spaced apart from the seal surface, and
a pump including an inlet chamber adjacent to the resilient membrane, and a piston including an end surface that is biased to a position where the end surface the holds the valve member against the seal surface and is movable to a pull-back position where the end surface is in spaced relation to the resilient structure;
an infusion device outlet operably connected to the fluid transfer device; and
a reservoir operably connected to the inlet valve of the fluid transfer device.
17. An infusion device as claimed in claim 16 , further comprising:
a housing; and
wherein the fluid transfer device and the reservoir are located within the housing.
18. An infusion device as claimed in claim 16 , wherein the reservoir comprises a negative pressure reservoir.
19. An infusion device as claimed in claim 16 , wherein the resilient membrane is mounted in tension on the valve base.
20. An infusion device as claimed in claim 16 , wherein the resilient membrane includes a plurality of narrow openings.
21. An infusion device as claimed in claim 16 , wherein the seal surface or the valve member includes a protrusion that extends around the lumen outlet.
22. An infusion device as claimed in claim 16 , wherein the pump includes an electromagnet.
23. An infusion device, comprising:
a fluid transfer device having
an inlet valve including a valve base defining a lumen having an outlet, a seal surface that extends around the lumen outlet and an outer diameter, and a cup-shaped resilient membrane, defining a relaxed inner diameter that is substantially less than the outer diameter of the valve base and including at least one narrow opening, mounted on the valve base, and a valve member associated with the narrow opening and movable between a closed state where the valve member engages the seal surface and an open state where at least a portion of the valve member is spaced apart from the seal surface, and
a pump including an inlet chamber adjacent to the resilient membrane, and a piston including an end surface that is biased to a position where the end surface the holds the valve member against the seal surface and is movable to a pull-back position where the end surface is in spaced relation to the resilient structure;
an infusion device outlet operably connected to the fluid transfer device; and
a reservoir operably connected to the inlet valve of the fluid transfer device.
24. An infusion device as claimed in claim 23 , wherein
the pump includes an outer pump tube; and
a portion of the cup-shaped resilient membrane is located between the valve base and the outer pump tube.
25. An infusion device as claimed in claim 24 , wherein
the pump includes an inlet tube with a main portion and the valve base; and
the main portion defines an outer surface, the outer pump tube defines an inner surface, and the outer surface of the inlet tube main portion abuts the inner surface of the outer pump tube.
26. An infusion device as claimed in claim 23 , wherein the relaxed inner diameter of the cup-shaped resilient membrane is about 50% to 95% of the outer diameter of the valve base.