Mechanical injection pump and method of use

Patent metadata

Field	Value
Publication number	US-2016144101-A1
Application number	US-201414553584-A
Country	US
Kind code	A1
Filing date	Nov 25, 2014
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

A mechanical injection pump wearable by a user to deliver a first fluid and a second fluid, including: a pump body having a first fluid chamber to hold the first fluid and a second fluid chamber to hold the second fluid; a common connector having a first inlet, a second inlet, and a common outlet; a first fluid system including the first fluid chamber, a first button drive connected to the first fluid chamber, and first fluid delivery path between the first fluid chamber and the first inlet; and a second fluid system including the second fluid chamber, a second button drive connected to the second fluid chamber, and second fluid delivery path between the second fluid chamber and the second inlet. Force by the user on the button drive increases pressure within the fluid chamber to drive a predetermined volume of the fluid from the fluid chamber.

First claim

1 . A mechanical injection pump wearable by a user to deliver a first fluid and a second fluid, the mechanical injection pump comprising:
a pump body defining a first fluid chamber and a second fluid chamber, the first fluid chamber being operable to hold the first fluid and the second fluid chamber being operable to hold the second fluid; a common connector having a first inlet, a second inlet, and a common outlet; a first fluid system including the first fluid chamber, a first button drive operably connected to the first fluid chamber, and a first fluid delivery path in fluid communication between the first fluid chamber and the first inlet; and a second fluid system including the second fluid chamber, a second button drive operably connected to the second fluid chamber, and a second fluid delivery path in fluid communication between the second fluid chamber and the second inlet; wherein force by the user on the first button drive is converted to increased pressure within the first fluid chamber to drive a predetermined volume of the first fluid from the first fluid chamber, through the first fluid delivery path to the common connector, and out the common outlet; and force by the user on the second button drive is converted to increased pressure within the second fluid chamber to drive a predetermined volume of the second fluid from the second fluid chamber, through the second fluid delivery path to the common connector, and out the common outlet.

2 . The mechanical injection pump of claim 1 wherein the first fluid is basal insulin and the second fluid is bolus insulin.

3 . The mechanical injection pump of claim 1 wherein the predetermined volume of the first fluid is not equal to the predetermined volume of the second fluid.

4 . The mechanical injection pump of claim 1 further comprising an adhesive patch attached to the pump body, the adhesive patch being operable to affix the pump body to the user.

5 . The mechanical injection pump of claim 1 for use with a first fluid reservoir and a second fluid reservoir, the first fluid delivery path further including a first outlet check valve, the second fluid delivery path further including a second outlet check valve, the mechanical injection pump further comprising:
first fluid supply path including a first inlet check valve in fluid communication between the first fluid reservoir and the first fluid chamber; and
second fluid supply path including a second inlet check valve in fluid communication between the second fluid reservoir and the second fluid chamber;
wherein, with the increased pressure within the first fluid chamber, the first inlet check valve prevents flow from the first fluid chamber towards the first fluid reservoir, and the first outlet check valve permits flow from the first fluid chamber toward the common outlet; and
with the increased pressure within the second fluid chamber, the second inlet check valve prevents flow from the second fluid chamber towards the second fluid reservoir, and the second outlet check valve permits flow from the second fluid chamber toward the common outlet.

6 . The mechanical injection pump of claim 5 , wherein:
with normal pressure within the first fluid chamber, the first inlet check valve permits flow from the first fluid reservoir towards the first fluid chamber, and the first outlet check valve prevents flow from the common outlet toward the first fluid chamber; and with normal pressure within the second fluid chamber, the second inlet check valve permits flow from the second fluid reservoir towards the second fluid chamber, and the second outlet check valve prevents flow from the common outlet toward the second fluid chamber.

7 . The mechanical injection pump of claim 5 wherein volume of the first fluid chamber equals the predetermined volume of the first fluid and volume of the second fluid chamber equals the predetermined volume of the second fluid chamber.

8 . The mechanical injection pump of claim 7 wherein the volume of the first fluid chamber is not equal to the volume of the second fluid chamber.

9 . The mechanical injection pump of claim 5 wherein the pump body further defines a first reservoir space and a second reservoir space, the first fluid reservoir being removably disposed in the first reservoir space and the second fluid reservoir being removably disposed in the second reservoir space.

10 . The mechanical injection pump of claim 9 wherein the first reservoir space is complementary in shape to the first fluid reservoir, the second reservoir space is complementary in shape to the second fluid reservoir, and the shape of the first reservoir space is different than the shape of the second reservoir space, so the first fluid reservoir cannot seat in the second reservoir space and the second fluid reservoir cannot seat in the first reservoir space.

11 . The mechanical injection pump of claim 9 wherein:
the first fluid reservoir comprises:
a hollow body;
a septum closing one end of the hollow body;
a slideable piston disposed within the hollow body; and
insulin disposed within the hollow body between the septum and the slideable piston; and

the first fluid supply path further comprises a hollow needle projecting into the first reservoir space, the hollow needle being operable to pierce the septum and establish fluid communication between the first fluid reservoir and the first fluid chamber when the first fluid reservoir is inserted in the first reservoir space.

12 . The mechanical injection pump of claim 5 wherein a portion of the pump body adjacent the first fluid reservoir and the second fluid reservoir is transparent.

13 . The mechanical injection pump of claim 5 wherein the first button drive comprises a piston slideably disposed in the first fluid chamber and a spring biasing the piston toward a released position, wherein force on the piston by the user slides the piston to a compressed position to drive the predetermined volume of the first fluid from the first fluid chamber.

14 . The mechanical injection pump of claim 5 wherein the first button drive comprises a piston slideably disposed in the first fluid chamber and a spring biasing the piston toward a released configuration, wherein force on the piston by the user slides the piston to a compressed position to fill the first fluid chamber with the predetermined volume of the first fluid from the first fluid chamber and release of the force on the piston by the user slides the piston to the released configuration to drive the predetermined volume of the first fluid from the first fluid chamber.

15 . The mechanical injection pump of claim 1 further comprising:
a first piston slideably disposed in the first fluid chamber and a first axial shaft operably connected between the first button drive and the first piston; and
a second piston slideably disposed in the second fluid chamber and a second axial shaft operably connected between the second button drive and the second piston;
wherein the force by the user on the first button drive advances the first piston a first predetermined distance into the first fluid chamber to drive the predetermined volume of the first fluid out the common outlet; and
the force by the user on the second button drive advances the second piston a second predetermined distance into the second fluid chamber to drive the predetermined volume of the second fluid out the common outlet.

16 . The mechanical injection pump of claim 15 wherein the first axial shaft has external threads, and the first button drive comprises:
an axially fixed ratchet wheel having exte

Assignees

• Medtronic Minimed Inc

Inventors

• Pananen Jacob E

Classifications

• A61M5/1409 Primary

  in series, e.g. first substance passing through container holding second substance, e.g. reconstitution systems (needle sets A61M5/162) · CPC title

• A61M5/1408 Primary

  in parallel, e.g. manifolds, sequencing valves (access sites A61M39/02; tube connectors A61M39/10) · CPC title

• A61M5/148

  flexible, {e.g. independent bags}(A61M5/155 takes precedence) · CPC title

• A61M2205/6045

  having complementary physical shapes for indexing or registration purposes · CPC title

• A61M2205/582

  by tactile feedback · CPC title