Test strip ejector for medical device

• US 9,494,569 B2
• Filed: 02/07/2013
• Issued: 11/15/2016
• Est. Priority Date: 02/07/2013
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Inventors: Bishop, Will A., Hanson, James R., Trese, Joyce A.
• Primary Examiner(s): Warden, Jill
• Assistant Examiner(s): Whatley, Benjamin
• Application Number:
  US13/761,465
• Publication Number:
  US 20140219712A1
• Time in Patent Office: 1,377 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/0295 Strip shaped analyte sensors for apparatus classified in A61B5/145 or A61B5/157 disposable multilayered or laminated electrodes G01N27/307; details of handling chemical test elements G01N33/4875
• CPC Class Codes: G01N 2035/00108 Test strips, e.g. paper
• CPC Class Codes: G01N 2035/00138 Slides
• CPC Class Codes: G01N 27/3273 Devices therefor, e.g. test element readers, circuitry details not specific to biochemical electrodes G01N33/4875
• CPC Class Codes: G01N 33/4875 Details of handling test elements, e.g. dispensing or storage, not specific to a particular test method test-elements per se B01L, automatic analysers G01N35/00, in-vivo analysis on the human body for medical diagnosis A61B
• CPC Class Codes: Y10T 403/591 having operating mechanism

Abstract

A system for receiving and ejecting a fluid testing device test strip includes a strip connector having first and second guide rails, and divider walls each having a channel. A sled has first and second legs connected to a cross member. Each leg has a contact leg extending inwardly from a chamfered end. The first and second legs when positioned parallel to the guide rails have the contact leg captured in the divider wall channels retaining the sled in sliding contact with the guide rails for motions in loading and ejection directions. A mechanism assembly is movably connected to the fluid testing device. The cross member is coupled so operation in a first direction displaces the sled in the loading direction positioning the sled in a test strip test position, and opposite operation positions the contact legs in direct contact with and ejects the test strip.

Claims

1. A test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device, the system comprising:

a strip connector configured to receive the test strip, the strip connector including first and second guide rails, and first and second divider walls between the first and second guide rails, wherein a first channel is defined between the first divider wall and the first guide rail, wherein a second channel is defined between the second divider wall and the second guide rail;

a sled having parallel first and second legs connected to a cross member at one end, each of the legs having a chamfered end located opposite to the end with the cross member, each of the legs having a contact leg extending inwardly from the chamfered end towards the divider walls, the first and second legs positioned in an orientation parallel to the first and second guide rails having the contact leg of each of the first and second legs captured in the first and second channels respectively, wherein the first and second legs of the sled are slidably disposed on and snap fitted to the first and second guide rails respectively to retain the sled in sliding continuous contact with the first and second guide rails for sled motion in each of a loading direction and an ejection direction; and

a mechanism assembly having an actuator arm coupled to the cross member of the sled to promote movement of the sled such that operation of the actuator arm of the mechanism assembly in a first direction displaces the sled in the loading direction to position the sled in a test strip test position, and opposite operation of the actuator arm of the mechanism assembly in a second direction displaces the sled in the ejection direction away from the test strip test position and to position the contact legs in direct contact with the test strip to eject the test strip from the fluid testing device by sled travel toward a test strip ejection position.

2. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 1, wherein the guide rails each include a guide rail planar portion upon which the sled is disposed in sliding contact.

3. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 2, wherein the contact legs are each oriented at an angle beta relative to the planar portion of one of the guide rails.

4. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 3, wherein the angle beta ranges from approximately 20 to approximately 70 degrees.

5. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 2, wherein each of the first and second legs includes a leg planar portion aligned parallel with and in sliding contact with the guide rail planar portion of one of the first or second guide rails.

6. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 1, wherein the legs are configured to deflect away from each other to allow the contact leg of each of the first and second legs to be received in the channels defined between the divider walls and the guide rails during installation of the sled onto the guide rails.

7. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 1, wherein the legs each include a convex portion transitioning into a concave portion, the concave portion capturing a guide rail bottom side of one of the first and second guide rails allowing retention of the sled with respect to the first and second guide rails.

8. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 7, wherein the contact leg of the first leg extends on a side of the first leg that is opposite with respect to the convex portion of the first leg and the contact leg of the second leg extends on a side of the second leg that is opposite with respect to the convex portion of the second leg.

9. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 1, further comprising:

the fluid testing device, wherein the fluid testing device includes a printed circuit board having the mechanism assembly connected thereto.

10. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 9, wherein the mechanism assembly includes:

a mounting pin connected to the printed circuit board;

a button body having an elongated slot receiving the mounting pin allowing the button body to slide inwardly and outwardly with respect to the fluid testing medical device; and

the actuator arm rotatably coupled to the mounting pin and rotatably connected to each of the button body and the cross member of the sled such that inward sliding motion of the button body induces axial rotation of the actuator arm and displacement of the sled in the ejection direction.

11. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 1, wherein the contact leg of the first leg and the contact leg of the second leg are aligned with one another to contact at the same time an end face of the test strip at two different locations to reduce any racking of the test strip.

12. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 1, wherein:

a strip receiving passage is located between the first guide rail and the second guide rail;

the first divider wall having a first notch;

the second divider wall having a second notch;

the contact leg of the first leg extends into the first notch of the first divider wall, wherein the contact leg of the first leg extends into the strip receiving passage to contact an end face of the test strip during ejection from the strip receiving passage; and

the contact leg of the second leg extends into the second notch of the second divider wall, wherein the contact leg of the second leg extends into the strip receiving passage to contact the end face of the test strip during ejection from the strip receiving passage.

13. A test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device, the system comprising:

a strip connector configured to receive the test strip, the strip connector including first and second guide rails, and first and second divider walls between the first and second guide rails, wherein a first channel is defined between the first divider wall and the first guide rail, wherein a second channel is defined between the second divider wall and the second guide rail;

a sled having parallel first and second legs connected to a cross member at one end, each of the legs having a chamfered end located opposite to the end with the cross member, each of the legs having a contact leg extending inwardly from the chamfered end towards the divider walls, the first and second legs positioned in an orientation parallel to the first and second guide rails having the contact leg of each of the first and second legs captured in the first and second channels respectively to retain the sled in sliding continuous contact with the first and second guide rails for sled motion in each of a loading direction and an ejection direction;

a mechanism assembly coupled to the cross member of the sled such that operation of the mechanism assembly in a first direction displaces the sled in the loading direction to position the sled in a test strip test position, and opposite operation of the mechanism assembly in a second direction displaces the sled in the ejection direction away from the test strip test position and to position the contact legs in direct contact with the test strip to eject the test strip from the fluid testing device by sled travel toward a test strip ejection position; and

wherein the mechanism assembly includes an actuator arm having an engagement post extending from the actuator arm; and

the cross member of the sled includes an elongated slot, the engagement post positioned in the elongated slot such that rotation of the actuator arm with respect to a longitudinal axis slidably displaces the sled.

14. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 13, wherein the mechanism assembly further includes a button body disposed to slide inwardly and outwardly with respect to the fluid testing medical device, the button body rotatably coupled to the actuator arm such that sliding displacement of the button body causes rotation of the actuator arm with respect to the longitudinal axis.

15. A test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device, the system comprising:

a strip connector configured to receive the test strip, the strip connector including first and second guide rails, and first and second divider walls between the first and second guide rails, wherein a first channel is defined between the first divider wall and the first guide rail, wherein a second channel is defined between the second divider wall and the second guide rail;

a sled having parallel first and second legs connected to a cross member at one end, each of the legs having a chamfered end located opposite to the end with the cross member, each of the legs having a contact leg extending inwardly from the chamfered end towards the divider walls, the first and second legs positioned in an orientation parallel to the first and second guide rails having the contact leg of each of the first and second legs captured in the first and second channels respectively to retain the sled in sliding continuous contact with the first and second guide rails for sled motion in each of a loading direction and an ejection direction;

a mechanism assembly coupled to the cross member of the sled such that operation of the mechanism assembly in a first direction displaces the sled in the loading direction to position the sled in a test strip test position, and opposite operation of the mechanism assembly in a second direction displaces the sled in the ejection direction away from the test strip test position and to position the contact legs in direct contact with the test strip to eject the test strip from the fluid testing device by sled travel toward a test strip ejection position; and

wherein the mechanism assembly includes a mounting pin having a first pin portion and a second pin portion, the second pin portion having a diameter smaller than a diameter of the first pin portion such that a pin shoulder is created between the first and second pin portions.

16. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 15, wherein the mechanism assembly further includes a button body having an elongated slot receiving the first portion of the mounting pin allowing the button body to slide inwardly and outwardly with respect to the fluid testing medical device, and the button body supported on the pin shoulder of the mounting pin.

17. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 15, wherein the mechanism assembly further includes an actuator arm rotatably coupled to the second pin portion of the mounting pin permitting only rotational motion of the actuator arm with respect to a longitudinal axis extending longitudinally through the mounting pin, the actuator arm is coupled to the cross member of the sled such that rotational motion of the actuator arm induces sliding displacement of the sled.

18. A test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device, the system comprising:

a strip connector configured to receive the test strip, the strip connector including first and second guide rails, and first and second divider walls positioned between the first and second guide rails, wherein a first channel is defined between the first divider wall and the first guide rail, wherein a second channel is defined between the second divider wall and the second guide rail;

a sled having parallel first and second legs connected to a cross member at one end, each of the legs having a free end located opposite to the end with the cross member, the cross member received in a cavity between the first and second guide rails, each of the legs having a contact leg extending inwardly from the free end towards the divider walls, the first and second legs positioned in an orientation parallel to the first and second guide rails having the contact leg of each of the first and second legs captured in the first and second channels respectively, wherein the first and second legs of the sled are slidably disposed on and snap fitted to the first and second guide rails respectively to retain the sled in sliding continuous contact with the first and second guide rails for sled motion in each of a loading direction and an ejection direction; and

a mechanism assembly having an actuator arm coupled to the cross member of the sled such that operation of the mechanism assembly in a first direction displaces the sled in the loading direction to position the sled in a test strip test position, and opposite operation of the mechanism assembly in a second direction displaces the sled in the ejection direction away from the test strip test position and to position the contact legs in direct contact with the test strip to eject the test strip from the fluid testing device by sled travel toward a test strip ejection position.

19. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 18, wherein the cross member includes first and second flanges acting to stiffen the cross member, the first and second flanges positioned entirely within the cavity between the first and second guide rails.

20. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 19, wherein the strip connector includes multiple insulator members having ends that define a travel stop for the sled when moved in the ejection direction, and the first flange is aligned to contact the ends of the insulator members that define the travel stop for the sled when moved in the ejection direction.

21. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 18, wherein the free end of the first and second legs of the sled is chamfered defining an angle with respect to a planar surface of each of the first and second guide rails when the sled is coupled in sliding contact with the first and second guide rails.

22. The test strip ejector system for receiving and ejecting a test strip of a fluid testing medical device of claim 18, wherein the strip connector includes a test strip receiving port for slidable receipt of the test strip, the channel of each of the first and second divider walls aligned in parallel with the test strip receiving port.