Expression pad

• US 7,384,402 B2
• Filed: 06/10/2004
• Issued: 06/10/2008
• Est. Priority Date: 06/10/2004
• Status: Expired due to Fees

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics Operations Incorporated (Roche Holding AG)
• Inventors: Wong, Daniel, Chan, Frank A.
• Primary Examiner(s): Hindenburg; Max
• Assistant Examiner(s): SMITH, FANGEMONIQUE A
• Application Number:
  US10/865,378
• Publication Number:
  US 20050277972A1
• Time in Patent Office: 1,461 Days
• Field of Search: 600/583, 600/573, 606181-183, 606/185
• US Class Current: 600/583
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150068 by tissue compression, e.g. with specially designed surface of device contacting the skin area to be pierced
• CPC Class Codes: A61B 5/150358 Strips for collecting blood, e.g. absorbent optical reagent test strips G01N21/8483; chemical reagent test strips G01N33/4875, G01N33/52
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/150748 Having means for aiding positioning of the piercing device at a location where the body is to be pierced means for aiding positioning of devices for bringing media into the body A61M5/427, locating blood vessels A61B5/489
• CPC Class Codes: A61B 5/15144 comprising driving means, e.g. a spring, for retracting the piercing unit into the housing

Abstract

An integrated body fluid sampling device is used to sample a body fluid from an incision in the skin of a body part. The device includes a lancet for forming the incision in the skin. A housing is coupled to the lancet. The housing defines at least in part a capillary channel with an opening. The capillary channel is sized to draw the body fluid from the incision via capillary action. An expression pad is coupled to the housing. The expression pad has opposing angled sides for compressing the backside of a body part where the incision is made. The lancet extends from the housing to form the incision. Fluid from the incision is drawn into the channel and is deposited on the test strip for analysis. A test strip is positioned along the capillary channel for analyzing the fluid.

Claims

1. A body fluid sampling device comprising:

a housing defining a capillary channel with an opening configured to draw a body fluid via capillary action;

a lancet for forming an incision in a front side of a finger, the finger has a backside that is opposite the front side, the lancet being slidably disposed within the housing; and

a pad secured to the housing, and aligned with the lancet such that the slidable motion of the lancet is in the direction of the pad, the pad having a first angled surface interconnected to an opposing second angled surface wherein deflection of the interconnection causes the first surface to deflect toward the second surface to compress only the backside of the finger to express the body fluid from the incision without compressing the front side of the finger.

2. The body fluid sampling device of claim 1, further comprising a test area positioned along the capillary channel for analyzing the body fluid.

3. The body fluid sampling device of claim 1, further comprising a testing system positioned along the capillary channel to analyze the body fluid.

4. The body fluid sampling device of claim 1, wherein the pad defines a flex recess for facilitating the rotation of the opposing angled surfaces inward against the backside of the finger,

the flex recess is opposite the opposing angled surfaces.

5. The body fluid sampling device of claim 1, wherein the pad is made of a compressible material.

6. The body fluid sampling device of claim 1, wherein the pad is made of foam rubber.

7. The body fluid sampling device of claim 1, wherein the opposing angled surfaces are oriented generally 90°

to 120°

apart.

8. A method for expressing a body fluid, comprising:

providing an integrated device that includes a lancet, a housing, and an expression pad, wherein the lancet and the housing define an annular space for drawing body fluid via capillary action, wherein the expression pad is coupled to the housing to define a finger access opening, wherein the expression pad has opposing angled surfaces facing the lancet, wherein a finger has a backside with a fingernail and an opposite front side;

inserting the finger into the finger access opening of the integrated device with the backside of the finger facing the expression pad and the front side of the finger facing the lancet;

forming an incision in the front side of the finger;

expressing the body fluid from the incision by pressing only the backside of the finger against the opposing angled surfaces of the expression pad without compressing the front side of the finger; and

drawing the body fluid into the annular passage; and

expressing the body fluid from the incision by pressing only the backside of the finger against the opposing angled surfaces of the expression pad without compressing the front side of the finger; and

drawing the body fluid into the annular passage.

9. The method of claim 8, further comprising:

drawing the body fluid into the annular space of the integrated device, wherein the integrated device includes a test strip; and

analyzing the body fluid with the test strip.

10. The method of claim 8, wherein the expressing and the drawing occur simultaneously.

11. The method of claim 8, wherein said pressing occurs before said forming the incision.