ELASTOMERIC TOROIDAL RING FOR BLOOD EXPRESSION

• US 20080065130A1
• Filed: 08/22/2006
• Published: 03/13/2008
• Est. Priority Date: 08/22/2006
• Status: Abandoned Application

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Inventors: Wong, Daniel, Patel, Paul
• Application Number:
  US11/466,202
• Publication Number:
  US 20080065130A1
• Time in Patent Office: Days
• US Class Current: 606/181
• 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 5/150419 comprising means for capillary action
• CPC Class Codes: A61B 5/150435 Specific design of proximal end
• CPC Class Codes: A61B 5/150511 Details of construction of shaft
• CPC Class Codes: A61B 5/15107 Piercing being assisted by a triggering mechanism
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap

Abstract

An expression device includes an expressing cap that defines a lancet opening. The expression cap has a skin contacting surface that is generally flat and positioned to face tissue during expression of body fluid. The expression cap includes an elastomeric ring extending around the lancet opening from the skin contacting surface. The elastomeric ring is made from elastomeric material. The expression cap has a beveled surface between the lancet opening and the elastomeric ring to enhance expression of the body fluid when the expression cap is pressed around an incision site. It was discovered that when the beveled was angled at about 20°, expression of the body fluid was significantly enhanced.

Claims

1. An expression device, comprising:

an expressing cap defining a lancet opening;

the expression cap having a skin contacting surface that is generally flat and positioned to face tissue during expression of body fluid;

the expression cap including an elastomeric ring extending around the lancet opening from the skin contacting surface, wherein the elastomeric ring includes elastomeric material; and

the expression cap having a beveled surface between the lancet opening and the elastomeric ring to enhance expression of the body fluid when the expression cap is pressed around an incision site.

2. The device of claim 1, wherein the beveled surface extends at a 20°

to 30°

angle relative to the skin contacting surface.

3. The device of claim 1, wherein the beveled surface extends at a 20°

angle relative to the skin contacting surface.

4. The device of claim 2, wherein:

the elastomeric ring has a outer diameter of 10 mm;

the elastomeric ring has an inner diameter of 7 mm;

the elastomeric ring has a height of 1.5 mm relative to the skin contacting surface; and

the lancet opening has an internal diameter of 6 mm.

5. The device of claim 1, wherein the elastomeric ring is an o-ring.

6. The device of claim 1, wherein the expression cap is generally ring-shaped.

7. The device of claim 1, further comprising an overmold layer covering the elastomeric ring.

8. A method, comprising:

forming an incision in skin; and

expressing body fluid from the incision by pressing around the incision in the skin an expression cap that includes an elastomeric ring made from elastomeric material and a beveled surface located inside the elastomeric ring.

9. The method of claim 8, wherein:

the expression cap has a generally flat skin contacting surface that extends parallel to the skin when pressed against the skin;

the beveled surface extends at a 20°

angle relative to the skin contacting surface; and

said expressing includes pressing the beveled surface against the skin.

10. The method of claim 9, further comprising:

pressing the expression cap against the skin before said forming the incision.

11. The method of claim 9, wherein said expressing includes pressing the expression cap against the skin for at least 4 seconds.

12. The method of claim 9, wherein said forming the incision includes lancing the skin to a depth of 1.8 mm.

13. The method of claim 8, further comprising:

wherein the expression cap has a generally flat skin contacting surface that extends parallel to the skin when pressed against the skin;

wherein the beveled surface extends at a 20°

angle relative to the skin contacting surface;

wherein said expressing includes pressing the beveled surface against the skin;

pushing the expression cap against the skin before said forming the incision;

wherein said expressing includes pressing the expression cap against the skin for at least 4 seconds; and

wherein said forming the incision includes lancing the skin to a depth of 1.8 mm.

14. The method of claim 8, wherein:

the expression cap has a generally flat skin contacting surface that extends parallel to the skin when pressed against the skin;

the beveled surface extends between a 20°

to 30°

angle relative to the skin contacting surface; and

said expressing includes pressing the beveled surface against the skin.

15. The method of claim 8, further comprising testing the body fluid.

16. The method of claim 8, wherein said expressing includes pressing the expression cap against the skin until at least 0.1 μ

L of the body fluid is on the surface of the skin.